Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
his study investigated the microbial community in a full scale anaerobic baffled reactor and sequencing batch reactor system for oil-produced water treatment in summer and winter. The community structures of fungi and bacteria were analyzed through polymerase chain reaction–denaturing gradient gel electrophoresis and Illumina high-throughput sequencing, respectively. Chemical oxygen demand effluent concentration achieved lower than 50 mg/L level after the system in both summer and winter, however, chemical oxygen demand removal rates after anaerobic baffled reactor treatment system were significant higher in summer than that in winter, which conformed to the microbial community diversity. Saccharomycotina, Fusarium, and Aspergillus were detected in both anaerobic baffled reactor and sequencing batch reactor during summer and winter. The fungal communities in anaerobic baffled reactor and sequencing batch reactor were shaped by seasons and treatment units, while there was no correlation between abundance of fungi and chemical oxygen demand removal rates. Compared to summer, the total amount of the dominant hydrocarbon degrading bacteria decreased by 10.2% in anaerobic baffled reactor, resulting in only around 23% of chemical oxygen demand was removed in winter. Although microbial community significantly varied in the three parallel sulfide reducing bacteria, the performance of these bioreactors had no significant difference between summer and winter.
Existing biological nitrogen removal processes and current scope of advancementSandip Magdum
In India, to achieve the stringent norms of total nitrogen less than 10 mg/l in sewage treatment plant is a big challenge for the public - private facilities and organizations. After successful implementation of this norm the pollutant burden from rivers and natural water bodies certainly reduces. The use of conventional biological nitrogen removal (BNR) processes for new treatment facility development or retrofitting is also an energy and cost intensive practice. The process technologies offered by current market such as MLE, MBBR, IFAS and SBR are still in with downside of higher footprint, multi tank reactors, heavy instrumentation for IR and RAS which ultimately incur higher capital and operating cost. The current market need and lack of sustainable nitrogen removal applications, trigger to review the of all available efficient biological nitrogen removal processes. This review will gives an overall scenario of past and current biological nitrogen removal process technologies with showing possible scope and way forward towards more energy neutral nitrogen removal technologies.
his study investigated the microbial community in a full scale anaerobic baffled reactor and sequencing batch reactor system for oil-produced water treatment in summer and winter. The community structures of fungi and bacteria were analyzed through polymerase chain reaction–denaturing gradient gel electrophoresis and Illumina high-throughput sequencing, respectively. Chemical oxygen demand effluent concentration achieved lower than 50 mg/L level after the system in both summer and winter, however, chemical oxygen demand removal rates after anaerobic baffled reactor treatment system were significant higher in summer than that in winter, which conformed to the microbial community diversity. Saccharomycotina, Fusarium, and Aspergillus were detected in both anaerobic baffled reactor and sequencing batch reactor during summer and winter. The fungal communities in anaerobic baffled reactor and sequencing batch reactor were shaped by seasons and treatment units, while there was no correlation between abundance of fungi and chemical oxygen demand removal rates. Compared to summer, the total amount of the dominant hydrocarbon degrading bacteria decreased by 10.2% in anaerobic baffled reactor, resulting in only around 23% of chemical oxygen demand was removed in winter. Although microbial community significantly varied in the three parallel sulfide reducing bacteria, the performance of these bioreactors had no significant difference between summer and winter.
Existing biological nitrogen removal processes and current scope of advancementSandip Magdum
In India, to achieve the stringent norms of total nitrogen less than 10 mg/l in sewage treatment plant is a big challenge for the public - private facilities and organizations. After successful implementation of this norm the pollutant burden from rivers and natural water bodies certainly reduces. The use of conventional biological nitrogen removal (BNR) processes for new treatment facility development or retrofitting is also an energy and cost intensive practice. The process technologies offered by current market such as MLE, MBBR, IFAS and SBR are still in with downside of higher footprint, multi tank reactors, heavy instrumentation for IR and RAS which ultimately incur higher capital and operating cost. The current market need and lack of sustainable nitrogen removal applications, trigger to review the of all available efficient biological nitrogen removal processes. This review will gives an overall scenario of past and current biological nitrogen removal process technologies with showing possible scope and way forward towards more energy neutral nitrogen removal technologies.
2017 - Analysis of nitrifying microbial communities by FISH and 16S rRNA ampl...WALEBUBLÉ
Nitrification, the sequential oxidation of ammonia via nitrite to nitrate, is an important process for nitrogen removal from municipal wastewater. This process is catalysed by ammonia-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB), two different groups of slow-growing microorganisms whose cooperation is needed to achieve complete nitrification. High efficiency and stability of this process is required for wastewater treatment plants (WWTPs) operational optimization due to
nitrification is often subjected to recurring collapse in many WWTPs. Therefore, a better understanding of the microbial ecology of nitrifying bacteria in WWTPs could
potentially improve the nitrification stability. Novel high-throughput molecular methods, as next generation sequencing (NGS), are nowadays providing detailed knowledge on the microorganisms governing wastewater treatment systems. This
methods in conjunction with the environmental ordination of the relationships between biological variables (nitrifying bacterial community) and physicochemical variables (nitrogen compounds and environmental conditions) provide a powerful
tool to elucidate how selection pressures imposed by operational and environmental conditions affect community diversity and dynamics within activated sludge systems.
Bijay Thapa, Nawa Raj Khatiwada, Anish Ghimire and Bikash Adhikari . “Study of Pollutant Removal in Activated Sludge Process Using Lab Scale Plant by Intermittent Aeration” United International Journal for Research & Technology (UIJRT) 1.2 (2019): 01-07.
International Refereed Journal of Engineering and Science (IRJES)irjes
International Refereed Journal of Engineering and Science (IRJES) is a leading international journal for publication of new ideas, the state of the art research results and fundamental advances in all aspects of Engineering and Science. IRJES is a open access, peer reviewed international journal with a primary objective to provide the academic community and industry for the submission of half of original research and applications
Biological Oxygen Demand Lab Analysis and BackgroundJonathan Damora
The purpose of this experiment is to perform a Biochemical Oxygen Demand test on primary clarifier effluent from a wastewater treatment plant to determine a BOD versus time curve. This curve can then be used to determine the Ultimate BOD of the wastewater sample and the rate constant for its decay.
Reflux it's impact on the removal of nitrogen and phosphorus from sewage wat...eSAT Journals
Abstract A/O BAF system has been used in the treatment of nitrogen and phosphorus and other nutrients present in wastewater, This economical and effective way of nutrients removal uses different parameters in the actualization of desired objectives, one of them is the Reflux ratio, this research focuses on the influence and roles of Reflux, Sponge Iron and Manganese sand on the removal of nitrogen and phosphorus from wastewater. The following experimental operational parameters was set up for the purpose of this experiment, Hydraulic load of 0.5 m3 / m2 • h., Air/Water ratio of 10:1 (0.42L/min) and reflux ratio of 100 and 200 percent. The experiment is divided into two main areas: The effects of reflux ratio presence and absences on removal efficiency of the BAF system. The reflux water was introduced into the anaerobic column and sometimes in aerobic column. The results were examined to note the extent to which reflux plays a part on the removal rate of the nutrients when introduced into the aerobic column instead of the anaerobic column and vice versa. sponge iron and manganese sand column were also introduced, and the results of the nitrifying bacteria shown it supports the removal efficiency observed in the BAF system. The results were all investigated, compared and the analysis showed that reflux helped more in the removal of nitrogen and ammonia, while sponge iron and manganese sand increased the removal efficiency of phosphorus from waste water Key Word: BAF: Biological Aeration Filter; Total Phosphorus; Total Nitrogen; Chemical Oxygen Demand (COD); Removal Efficiency;
The effect of reduction of aeration period on organic pollutants removal in s...SophieShi7
The authors investigated the possibility to reduce aeration time in one of the cycles of sequencing batch activated sludge reactors. It is known that there are microorganisms in activated sludge which can store organic materials temporarily in such forms as polyhydroxyalkanoate (PHA). It was expected that removal of organic materials in the cycle with reduced aeration was supplemented by the microbial activities to store organic materials temporarily. The authors operated sequencing batch reactors with 6 cycles/day with synthetic wastewater, and reduced aeration in one of the cycles. Short-term experiments were conducted to see the effects of aeration reduction for one time, and long-term experiments were conducted to see the effect of long term implementation of operation with aeration reduction. In both experiments, removal of DOC was greater than 92%, and no significant adverse effect was observed. The more aeration was reduced, the more PHA was carried over to the following cycles. It was estimated that about 17% to 50 % of PHA was carried over to the cycles following the cycles in which aeration was reduced. The operation with one-cycle reduced aeration was successfully implemented in the experiments. There is a big room to explore wastewater treatment technologies in the direction to flexibly control energy consumption.
ABSTRACT- This study is an attempt to analyze the water quality of river Ganga in Patna district. Water samples
were collected from 16 different Ghats during March-May 2017. Due to heavy discharge of municipal waste and
anthropogenic activities in the river the biological, chemical and physical characteristics of water have changed to a
considerable extent. The objectives of this study were to find out the changes in physicochemical nature as well as
biological health of river Ganga. Samples were analyzed on various physicochemical parameter i.e. Total Hardness, pH,
B.O.D., and D.O. by using the standard methods and procedures. The result shown that the average pH -7.95, average,
D.O.-2.91 mg/L, average B.O.D. -2.41 mg/L, average total hardness -114.72 mg/L. Microbial analysis was also
conducted in terms of Most Probable Number [MPN] of total coliforms in the water sample and it shown the highest
value for all samples. The presence and absence of the gas bubble in each tube were used to calculate an index known as
the Most Probable Number.
Key-words- Ganga, Patna, Physicochemical, Microbial, Coliforms, MPN, D.O., B.O.D., Hardness, pH
ENA via Groundwater Circulation Well (IEG-GCW®)Eduard J. Alesi
First Pilot Test on the Integration of GCW (Groundwater
Circulation Well) with ENA (Enhanced Natural Attenuation) for
Chlorinated Solvents Source Remediation.
2017 - Environmental Ordination of Filamentous Bacteria in Activated SludgeWALEBUBLÉ
Reference:
Zornoza, A., Serrano, S. and Alonso, J.L. (2017) Environmental Ordination of Filamentous Bacteria in Activated Sludge. In: Abstracts of the 7th congress of European microbiologists FEMS 2017, Valencia, Spain, 9-13 July 2017.
2017 - Plausible Bioindicators of Biological Nitrogen Removal Process in WWTPsWALEBUBLÉ
Reference:
Zornoza, A., Alonso, J.L. and Serrano, S. (2017) Plausible Bioindicators of Biological Nitrogen Removal Process in WWTPs. In: Abstracts of the 7th congress of European microbiologists FEMS 2017, Valencia, Spain, 9-13 July 2017.
Removal of Heavy Metals from Aqueous Solutions by Modified Activated Carbon f...inventionjournals
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
2017 - Analysis of nitrifying microbial communities by FISH and 16S rRNA ampl...WALEBUBLÉ
Nitrification, the sequential oxidation of ammonia via nitrite to nitrate, is an important process for nitrogen removal from municipal wastewater. This process is catalysed by ammonia-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB), two different groups of slow-growing microorganisms whose cooperation is needed to achieve complete nitrification. High efficiency and stability of this process is required for wastewater treatment plants (WWTPs) operational optimization due to
nitrification is often subjected to recurring collapse in many WWTPs. Therefore, a better understanding of the microbial ecology of nitrifying bacteria in WWTPs could
potentially improve the nitrification stability. Novel high-throughput molecular methods, as next generation sequencing (NGS), are nowadays providing detailed knowledge on the microorganisms governing wastewater treatment systems. This
methods in conjunction with the environmental ordination of the relationships between biological variables (nitrifying bacterial community) and physicochemical variables (nitrogen compounds and environmental conditions) provide a powerful
tool to elucidate how selection pressures imposed by operational and environmental conditions affect community diversity and dynamics within activated sludge systems.
Bijay Thapa, Nawa Raj Khatiwada, Anish Ghimire and Bikash Adhikari . “Study of Pollutant Removal in Activated Sludge Process Using Lab Scale Plant by Intermittent Aeration” United International Journal for Research & Technology (UIJRT) 1.2 (2019): 01-07.
International Refereed Journal of Engineering and Science (IRJES)irjes
International Refereed Journal of Engineering and Science (IRJES) is a leading international journal for publication of new ideas, the state of the art research results and fundamental advances in all aspects of Engineering and Science. IRJES is a open access, peer reviewed international journal with a primary objective to provide the academic community and industry for the submission of half of original research and applications
Biological Oxygen Demand Lab Analysis and BackgroundJonathan Damora
The purpose of this experiment is to perform a Biochemical Oxygen Demand test on primary clarifier effluent from a wastewater treatment plant to determine a BOD versus time curve. This curve can then be used to determine the Ultimate BOD of the wastewater sample and the rate constant for its decay.
Reflux it's impact on the removal of nitrogen and phosphorus from sewage wat...eSAT Journals
Abstract A/O BAF system has been used in the treatment of nitrogen and phosphorus and other nutrients present in wastewater, This economical and effective way of nutrients removal uses different parameters in the actualization of desired objectives, one of them is the Reflux ratio, this research focuses on the influence and roles of Reflux, Sponge Iron and Manganese sand on the removal of nitrogen and phosphorus from wastewater. The following experimental operational parameters was set up for the purpose of this experiment, Hydraulic load of 0.5 m3 / m2 • h., Air/Water ratio of 10:1 (0.42L/min) and reflux ratio of 100 and 200 percent. The experiment is divided into two main areas: The effects of reflux ratio presence and absences on removal efficiency of the BAF system. The reflux water was introduced into the anaerobic column and sometimes in aerobic column. The results were examined to note the extent to which reflux plays a part on the removal rate of the nutrients when introduced into the aerobic column instead of the anaerobic column and vice versa. sponge iron and manganese sand column were also introduced, and the results of the nitrifying bacteria shown it supports the removal efficiency observed in the BAF system. The results were all investigated, compared and the analysis showed that reflux helped more in the removal of nitrogen and ammonia, while sponge iron and manganese sand increased the removal efficiency of phosphorus from waste water Key Word: BAF: Biological Aeration Filter; Total Phosphorus; Total Nitrogen; Chemical Oxygen Demand (COD); Removal Efficiency;
The effect of reduction of aeration period on organic pollutants removal in s...SophieShi7
The authors investigated the possibility to reduce aeration time in one of the cycles of sequencing batch activated sludge reactors. It is known that there are microorganisms in activated sludge which can store organic materials temporarily in such forms as polyhydroxyalkanoate (PHA). It was expected that removal of organic materials in the cycle with reduced aeration was supplemented by the microbial activities to store organic materials temporarily. The authors operated sequencing batch reactors with 6 cycles/day with synthetic wastewater, and reduced aeration in one of the cycles. Short-term experiments were conducted to see the effects of aeration reduction for one time, and long-term experiments were conducted to see the effect of long term implementation of operation with aeration reduction. In both experiments, removal of DOC was greater than 92%, and no significant adverse effect was observed. The more aeration was reduced, the more PHA was carried over to the following cycles. It was estimated that about 17% to 50 % of PHA was carried over to the cycles following the cycles in which aeration was reduced. The operation with one-cycle reduced aeration was successfully implemented in the experiments. There is a big room to explore wastewater treatment technologies in the direction to flexibly control energy consumption.
ABSTRACT- This study is an attempt to analyze the water quality of river Ganga in Patna district. Water samples
were collected from 16 different Ghats during March-May 2017. Due to heavy discharge of municipal waste and
anthropogenic activities in the river the biological, chemical and physical characteristics of water have changed to a
considerable extent. The objectives of this study were to find out the changes in physicochemical nature as well as
biological health of river Ganga. Samples were analyzed on various physicochemical parameter i.e. Total Hardness, pH,
B.O.D., and D.O. by using the standard methods and procedures. The result shown that the average pH -7.95, average,
D.O.-2.91 mg/L, average B.O.D. -2.41 mg/L, average total hardness -114.72 mg/L. Microbial analysis was also
conducted in terms of Most Probable Number [MPN] of total coliforms in the water sample and it shown the highest
value for all samples. The presence and absence of the gas bubble in each tube were used to calculate an index known as
the Most Probable Number.
Key-words- Ganga, Patna, Physicochemical, Microbial, Coliforms, MPN, D.O., B.O.D., Hardness, pH
ENA via Groundwater Circulation Well (IEG-GCW®)Eduard J. Alesi
First Pilot Test on the Integration of GCW (Groundwater
Circulation Well) with ENA (Enhanced Natural Attenuation) for
Chlorinated Solvents Source Remediation.
2017 - Environmental Ordination of Filamentous Bacteria in Activated SludgeWALEBUBLÉ
Reference:
Zornoza, A., Serrano, S. and Alonso, J.L. (2017) Environmental Ordination of Filamentous Bacteria in Activated Sludge. In: Abstracts of the 7th congress of European microbiologists FEMS 2017, Valencia, Spain, 9-13 July 2017.
2017 - Plausible Bioindicators of Biological Nitrogen Removal Process in WWTPsWALEBUBLÉ
Reference:
Zornoza, A., Alonso, J.L. and Serrano, S. (2017) Plausible Bioindicators of Biological Nitrogen Removal Process in WWTPs. In: Abstracts of the 7th congress of European microbiologists FEMS 2017, Valencia, Spain, 9-13 July 2017.
Removal of Heavy Metals from Aqueous Solutions by Modified Activated Carbon f...inventionjournals
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
Een voor de hand liggende opdracht voor iedere generatie is ervoor te zorgen dat de nakomelingen een wereld erven die hen alle kansen biedt op een minstens even goed bestaan. Met de dreigende gevolgen van de opwarming van de aarde, de teloorgang van biodiversiteit en de uitputting van natuurlijke hulpbronnen komt het nakomen van deze morele plicht steeds meer in het gedrang.
Een mogelijk antwoord is onze ecologische voetafdruk drastisch te verminderen. Kan dit echter zonder de welvaartsmachine van de vrije markt in duigen te laten vallen? Ecomodernisten zijn van mening dat dit mogelijk moet zijn. Ze geloven dat technologische vooruitgang economische groei kan verzoenen met ecologische doelstellingen.
Hoe realistisch zijn de scenario’s van het ecomodernisme en wat is nodig om dit nirwana te bereiken?
Lees de inspiratienota van ETION: http://www.etion.be/kennisbank/economie-en-ecologie-een-perfecte-symbiose
Large-Scale Scrum (LeSS) is scaling framework created by Craig Larman and Bas Vodde. I Presented a case study on LeSS to PlayScrum-Pune user group on 7th Nov.
Making Your IEP System Work for You: 5 Questions to Ask About Your IEP SystemAccelify
An effective IEP system should accommodate your workflow, not determine it. If you and your staff are bending over backward to make your IEP system work for you, it may not be doing its job. And with limited options on the market, of which many lack sufficient flexibility, it may seem like demanding that your current system do more or migrating from one IEP system to another, may not be worthwhile. But reevaluating your IEP system can be disruptive in a good way too. Demanding more from your IEP system can lead to better tools that help you and your staff more efficiently manage the IEP process and the data needed to manage compliance along the way.
Transition Planning: How To Avoid the "Black-Hole" Between Graduation and Adu...Accelify
Transition planning and implementation of best practices is critical to ensuring successful transition to post-secondary options. Evidence shows that if transition is not carefully and successfully carried out, young adults can become lost in the "black-hole" between graduation and adulthood. Falling into this "black-hole" leaves young adults without independent life skills, embedded maladaptive behaviors, and without the self-determination to leave home. In this webinar, Jennifer Kaut, M.Ed., BCBA, shares best practices for transitioning to post-secondary options, including the impact of quality vocational rehabilitation for students.
Beyond the ITIL Binder: Process Improvements Through Critical CommunicationsJesse Andrew
Slides from our recent webinar, Beyond the ITIL Binder: Process Improvements Through Critical Communications. Recording to come shortly!
Abstract:
In an effort to streamline IT with the needs of a business, IT best practice frameworks, such as ITIL, continue to be the go-to resource for IT organizations. Although these frameworks offer guidance, the one-size-fits-all set of best practices often lack specific practical details or examples on how to implement within an organization.
Without a proper communication framework, it becomes difficult to implement and use the best practices set fourth in ITIL. In this presentation, David de Swaan Arons, former ITIL consultant and ITSM manager, reviews critical communication considerations and best practices practices to improve ITIL and ITSM processes.
Lean, Six Sigma, ToC using DMAIC - Measure phase Simon Misiewicz
This presentation guides you through the DMAIC methodology that encompasses Lean, Six Sigma and ToC initiatives. The Measure phase guides you through the detailed process mapping of the SIPOC diagram to Swim Lanes, spaghetti diagrams that focus on time, cost and quality. The presentation guides you though the statistics element of data sampling and to understand the theory of constraints. The presentation also discusses the use of Pareto charts to identify the key issues within a process. – Optimise-GB (Creating Operational Efficiencies)
A Study on Biological Treatment of Bio-Diesel Industrial Effluent Using FBBRijceronline
The present study involves experimentation on the treatment of bio-diesel industrial effluent using a laboratory scale model of Fluidized Bed Bioreactor (FBBR) with three different bed materials viz., MBBR Plastic media, Pumice Stones, high density Foam material. The experiment mainly focuses on the removal of Biological Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) from the bio-diesel industrial effluent. The experiment is conducted for a period over 2 to 3 weeks at daily intervals, till the reactor gets stabilized and a maximum and uniform rates of percent removal of BOD and COD are obtained. The experimental data is analyzed and the results are presented in suitable formats. From the Bio-kinetic study involving reaction rate kinetics and microbial growth kinetics it is observed that, the bio-kinetic reactions taking place in the reactor conform to First order rate of reactions and the Foam pieces are proved to be a good alternative material when compared with that of the Commercially available MBBR (plastic) media
Low Cost Anaerobic Treatment of Municipal Solid Waste Leachateiosrjce
IOSR Journal of Environmental Science, Toxicology and Food Technology (IOSR-JESTFT) multidisciplinary peer-reviewed Journal with reputable academics and experts as board member. IOSR-JESTFT is designed for the prompt publication of peer-reviewed articles in all areas of subject. The journal articles will be accessed freely online
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Electricity Generation from Biogas Produced in a Lab-Scale Anaerobic Digester...inventionjournals
The sludge produced during wastewater treatment should be stabilized in order to minimize the damage to the environment. This study includes the evaluation of sludge stabilization and biogas formation by anaerobic digestion in order to generate electricity using stirling motor.The study was carried out with the raw sludge form the thickener of the wastewatertreatment plant. The main aim of the study is to provide sludge stabilization resulting biogas production by reduction of organic matter and to generate electricity. Anaerobic digestion studies were carried out using a laboratory scale anaerobic reactor with a volume of 7L.Under themesophilic condition, the sludge age was maintained at 10 days during the first 20 days of operation, while the reactor was operated for 90 days until the end of the run, with a sludge age of 20 days.The results have changed in the range of 42-52% after the organic matter reduction obtained from the anaerobic digestion. Concentrations of 3735.7300 ppm, 5060.5768 ppm, and 6951.4013 ppm biogas were obtained. Biogas was turned on by mechanical energy with a Stirlingmotor and then turned to direct current and the lamps with 3V 20mA each were run for 60 minutes
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
FEASIBILITY STUDY OF TREATMENT OF EFFLUENT FROM A BULK DRUG MANUFACTURING IND...Journal For Research
A study has been carried out on aerobic biological treatment of a bulk drug industrial effluent which is highly acidic in nature and shows high value of BOD5 (≈ 36000 mg/l), COD (≈ 84000 mg/l). Chemical treatment conducted for neutralizing the pH followed by biological treatment using a lab-scale reactor with acclimatized bacterial consortia isolated from natural soil has confirmed its feasibility for biological treatment. About 99% removal of COD from starting value of around 8000 mg/l has been achieved. The COD value in different hydraulic retention time (HRT) has been brought down to less than 100 mg/l in treated effluent, showing high removal of dissolved organics by aerobic biological treatment.
Parametric Studies on Detergent Using Low Cost SorbentIOSR Journals
: Water is a valued natural resource for the existence of all living organisms. Indian rivers are
polluted due to the discharge of untreated sewage and industrial effluents. Management of the quality of this
precious resource is, therefore, of special importance. In these study industrial effluents samples from the
various detergent factories were collected and analyzed for physicochemical and bacteriological evaluation of
pollution. The use and effectiveness of granular and powder activated carbon made from agricultural waste i.e.
coconut husk and that coconut husk is a suitable adsorbent for such an effluent. Maximum adsorption capacity
is a derived from Langmuir isotherm. A series of fixed bed experiments was carried out and the results were
applied to a bed-depth/service time model for column adsorption. The validity of such a model is discussed. In
the removal of organic matter in wastewater effluents from a industry waste water were investigated. The effect
of process variables such as carbonization temperature, carbonization duration and activation temperature on
the production and quality of activated carbon was studied as well as adsorption capacity was studied
Different Wastewater treatment processes and developmentshhhoaib
An attempt to compare and review the potential future use of three aerobic biological systems, namely:
Conventional Activated Sludge Process (CASP),
Moving Bed Biofilm Reactor (MBBR),
and Packed-Bed Biofilm Reactor (PBBR)
for on-site treatment of wastewater from residential complexes.
Experimental Investigation of a Household Refrigerator Using Evaporative-Cool...inventy
The objective of this paper was to investigate experimentally the effect of Evaporative-cooled condenser in a household refrigerator. The experiment was done using HCF134a as the refrigerant. The performance of the household refrigerator with air-cooled and Evaporative-cooled condenser was compared for different load conditions. The results indicate that the refrigerator performance had improved when evaporative-cooled condenser was used instead of air-cooled condenser on all load conditions. Evaporativecooled condenser reduced the energy consumption when compared with the air-cooled condenser. There was also an enhancement in coefficient of performance (COP) when evaporative-cooled condenser was used instead of air-cooled condenser. The Evaporative cooled heat exchanger was designed and the system was modified by retrofitting it, instead of the conventional air-cooled condenser by making drop wise condensation using water and forced circulation over the condenser. From the experimental analysis it is observed that the COP of evaporative cooled system increased by 13.44% compared to that of air cooled system. So the overall efficiency and refrigerating effect is increased. In minimum constructional, maintenance and running cost, the system is much useful for domestic purpose. This study also revealed that combining a evaporative cooled system along with conventional water cooled system under the condition that the defrost water obtained from the freezer is used for drop wise condensation over condenser and water cooled condensation of the condenser at the bottom using remaining defrost water would reduce the power consumption, work done and hence further increase in refrigerating effect of the system. The study has shown that such a system is technically feasible and economically viable
Copper Strip Corrossion Test in Various Aviation Fuelsinventy
This research work takes in to account of corrosiveness test on various aviation fuels in the state of Telengana (India). The purpose of this experiment is to determine the corrosiveness test of fuels. This determination will be accomplished by using copper strip corrosion test by using the copper strip experiment we can determine the corrosive property of the fuel and hence the efficiency of fuel. The research covers the importance of knowing the corrosive property of different petroleum fuels including aviation turbine fuel.
Additional Conservation Laws for Two-Velocity Hydrodynamics Equations with th...inventy
A series of the differential identities connecting velocities, pressure and body force in the twovelocity hydrodynamics equations with equilibrium of pressure phases in reversible hydrodynamic approximation is obtaned.
Comparative Study of the Quality of Life, Quality of Work Life and Organisati...inventy
People’s lives are increasingly centred on work; they spend at least one-third of their time within the organisations that employ them. Investigating the factors that interfere with employees’ well-being and the organisational environment is becoming an increasing concern in organisations. This article identifies the criteria of the quality of life (QoL), quality of working life (QWL) and organisational climate instruments to point out their similarities. For bibliographic construction and data research, articles were sought in national and international journals, books and dissertations/articles in SciELO, Science Direct, Medline and Pub Med databases. The results show direct relationships amongst QoL, QWL and organisational climate instruments. The relationship between QoL and QWL instruments is based on fair compensation, social interaction, organisational communication, working conditions and functional capacity. QWL and organisational climate instruments are related through social interaction and interfaces. QoL and organisational climate instruments are related based on social interaction, organisational communication, and work conditions.
A Study of Automated Decision Making Systemsinventy
The decision making process of many operations are dependent on analysing very large data sets, previous decisions and their results. The information generated from the large data sets are used as an input for making decisions. Since the decisions to be taken in day to day operations are expanding, the time taken for manual decision making is also expanding. In order to reduce the time, cost and to increase the efficiency and accuracy, which are the most important things for customer satisfaction, many organisations are adopting the automated decision making systems. This paper is about the technologies used for automated decision making systems and the areas in which automated decisions systems works more efficiently and accurately.
Crystallization of L-Glutamic Acid: Mechanism of Heterogeneous β -Form Nuclea...inventy
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Effect of Various External and Internal Factors on the Carrier Mobility in n-...inventy
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Transient flow analysis for horizontal axial upper-wind turbineinventy
This study is to carry out a transient flow field analysis on the condition that the wind turbine is working to generate turbine, the wind turbine operating conditions change over time, Purpose of this study is try to find out the rule from the wind turbine changing over time . In transient analysis, the wind velocity on inlet boundary and rotation speed in the rotor field will change over time, and an analytical process is provided that can be used for future reference. At present, the wind turbine model is designed on the concept of upwind horizontal axis type. The computer engineering software GH Bladed is used to obtain the relationship between the rotor velocity and the wind turbine. Then the ANSYS engineering software is used to calculate the stress and strain distribution in the blades over time. From the analytical result, the relationship between the stress distribution in the blades and the rotor velocity is got to be used as a reference for future wind turbine structural optimization.
Choice of Numerical Integration Method for Wind Time History Analysis of Tall...inventy
Wind tunnel tests are being performed routinely around the world for designing tall buildings but the advent of powerful computational tools will make time-history analysis for wind more common in near future. As the duration of wind storms ranges from tens of minutes to hours while earthquake durations are typically less than a three to four minutes, the choice of a time step size (Δt) for wind studies needs to be much larger both to reduce the computational time and to save disk space. As the error in any numerical solution of the equation of motion is dependent on step size (Δt), careful investigations on the choice of numerical integration methods for wind analyses are necessary. From a wide variety of integration methods available, it was decided to investigate three methods that seem appropriate for 3D-time history analysis of tall buildings for wind. These are modal time history analysis, the Hilber-Hughes-Taylor (HHT) method or α-method with α=- 0.1, and the Newmark method with β=0.25 and γ=0.5 ( i.e., trapezoidal rule). SAP2000, a common structural analysis software tool, and a 64-story structure are used to conduct all the analyses in this paper. A boundary layer wind tunnel (BLWT) pressure time history measured at 120 locations around the building envelope of a similar structure is used for the analyses. Analyses performed with both the HHT and Newmark-method considering P-delta effects show that second order effects have a considerable impact on both displacement and acceleration response. This result shows that it is necessary to account P-delta effect for wind analysis of tall buildings. As the direct integration time history analysis required very large computation times and very large computer physical memory for a wind duration of hours, a modal analysis with reduced stiffness is considered as a good alternative. For that purpose, a non-linear static analysis of the structure with a load combination of 1.0D + 1.0L is performed in SAP2000 and the reduced stiffness of the structure after the analysis is used to conduct an eigenvalue analysis to extract the mode shapes and frequencies of this structure. Then the first 20- modes are used to perform a modal time history analysis for wind load. The result shows that the responses from modal analysis with “20-mode (reduced stiffness)” are comparable with that from the P-Δ analyses of Newmark-method
Impacts of Demand Side Management on System Reliability Evaluationinventy
Electricity demand in Saudi Arabia is steadily increasing as electrical loads grows at a rate of about 7% per year, this represents a high rate by all standards, and largely due to population growth, as well as due to government subsidies which may lead to prices much lower than actual production cost. This growth represents a challenge that requires Saudi Electricity Company (SEC) to invest huge amounts of money every year, for the construction of additional generation capacity along with the reinforcement of transmission network to meet the consumption growth.Also the demand varies frequently throughout the day, causing a waste of a large part of the energy. SEC believes the optimum solution lies in altering the load shape in order to have a better balance between customer’s consumption and SEC’s generation, This paper describes the method for improving the power system reliability by shifting the portion of peak load to off-peak periods This load management scheme can be achieved by lifting the generation during off peak periods and utilizing the stored energy during peak periods. A hybrid set up involving solar and wind energy along with batteries can also be used to store energy and utilize it during peak periods.
Reliability Evaluation of Riyadh System Incorporating Renewable Generationinventy
In this paper, the experience of Saudi Electricity Company (SEC) in analyzing the generation adequacy for Year 2013 is presented. This analysis is conducted by calculating several reliability indices for Riyadh system hourly load during all four seasonal periods. The reliability indices are gauged against the international utility practice. SEC also plans to introduce renewable energy into the network in order to secure the environmental standards and reduce fuel costs of conventional generation. Thus, the reliability improvement due to different integration levels of Solar and Wind generating sources has also been investigated. The capacity value provided by these variable renewable energy sources (VERs) to reliably meet the system load has been calculated using effective load carrying capability (ELCC) technique with a loss of load expectancy metric.
The effect of reduced pressure acetylene plasma treatment on physical charact...inventy
The capacitors are increasingly being used as energy storage devicesin various power systems. The scientists of the world are tryingto maximize the electrical capacity of the supercapacitors. To achieve this purpose, numerous method sare used: the surface activation of electrodes, the surface etching using the electronbeam, the electrode etching with variousgasplasma, etc. The purpose of this work is toresearch how the properties of carbon electrodes depend on the plasma parameters at whichtheywere formed. The largest surface area ofcarbonelectrodeof47.25m2 /gis obtainedat 15 ofAr/C2H2gasratio. Meanwhile, theSEMimages show that the disruption of structures with low bond energies and the formation of new onesare taking place when the carbon electrodes are etched at acetylene plasma and placed on carbon electrode. The measurements of capacitance showthat capacitors with affectedelectrodes have about10-15% highercapacity than those not treated with acetyleneplasma.
Experimental Investigation of Mini Cooler cum Freezerinventy
In general cases the refrigerator could be converted into an air conditioner by attaching a fan. Thus a cooler as well as freezer is obtained in a single set up. The freezer can be converted to an air conditioner when the outside air is allowed to flow beside the cooling coil and is forced outside by an exhaust fan. In this case a mini scale cooler cum freezer using R134a as refrigerant was fabricated and tested In our mini project work we had designed, fabricated and experimentally analysed a mini cooler cum freezer. From the observations and calculations, the results of mini cooler cum freezer are obtained and are compared.
Growth and Magnetic properties of MnGeP2 thin filmsinventy
We have successfully grown MnGeP2 thin films on GaAs (100) substrate. A ferromagnetic transition near 320 K has been observed by temperature dependent magnetization and resistance measurements. Field dependent magnetization experiments have shown that the coercive fields at 5, 250, and 300 K are 3870, 1380 and 155 Oe, respectively. Magnetoresistance and Hall measurements have displayed that hole conduction is dominant in MnGeP2. PACS: 75.50.Pp, 75.70.-i, 85.70.-w, 73.50.-h
Encryption in Microsoft 365 - ExpertsLive Netherlands 2024Albert Hoitingh
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A tale of scale & speed: How the US Navy is enabling software delivery from l...sonjaschweigert1
Rapid and secure feature delivery is a goal across every application team and every branch of the DoD. The Navy’s DevSecOps platform, Party Barge, has achieved:
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Generative AI Deep Dive: Advancing from Proof of Concept to ProductionAggregage
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A0550106
1. Research Inventy: International Journal Of Engineering And Science
Vol.5, Issue 5 (May 2015), PP 01-06
Issn (e): 2278-4721, Issn (p):2319-6483, www.researchinventy.com
1
Biokinetics of Removal of BOD and COD from Domestic Sewage
Using Fluidized Bed Bio-Reactor
1
Dr.
G.V.R.Srinivasa Rao, 2
K.Srinivasa Murty
3
Nagendra Babu D
1
(Professor, Dept. of Civil Engineering,Andhra Univesity,Vizag
2
(Lecturer,MRAGR Govt.Polytechnic, Vizianagaram
3
(PG Student,Dept of Civil Engg., Andhra Univesity,Vizag
ABSTRACT - The most harmful component of the wastewater i.e., the organic content can generally be
removed in biological methods of wastewater treatment. Out of many Bio reactors that are in use to treat the
wastewater, Fluidized Bed Bio Reactors (FBBR) are nowadays widely used keeping their advantages relative to
the other types. An attempt has been made in the present work, to study the removal of Biological Oxygen
Demand (BOD) and Chemical Oxygen Demand (COD) from municipal wastewater using a laboratory scale
model of fluidized bed bioreactor. An experimental setup is fabricated with three Acrylic glass columns of
uniform dia. 6.9 cm and length 120cm. The MBBR media (plastic), Pumice stones, and Foam Pieces of uniform
shape and size are considered as three different bed materials. An arrangement for sending compressed air is
provided at the bottom of the columns. Municipal wastewater is taken as stock solution for conducting the study.
The experiment is conducted for over 2 to 3 weeks at daily intervals, till the reactor gets stabilized and a
maximum and uniform rate of percent removal of BOD and COD is obtained. The experimental data is analyzed
and the results are presented in suitable formats. The Bio-kinetic study involving reaction rate kinetics and
microbial growth kinetics are conducted for the zero order, first order, and second order rate of reactions. From
the experimental results it is observed that the bio-kinetic reactions taking place in the reactor confirm to First
order rate of reactions. Also, it is observed that Foam Pieces is proved to be a good alternative material when
compared with that of the commercially available MBBR media which is made up of plastic.
Keywords – BOD,COD,FBBR,Growth Kinetics, Reaction kinetics
I. INTRODUCTION
Municipal wastewater treatment plant is a facility designed to receive the waste from domestic and
commercial sources and to remove materials that damage water quality and affect public health and safety when
discharged into water receiving systems. Conventional wastewater treatment processes consists of a
combination of physical, chemical, and biological processes and operations to remove solids, organic matter,
and other harmful material from wastewater. Wastewater treatment involving physical, chemical and biological
unit processes is carried out in vessels or tanks commonly known as reactors. Reactors that work by growing
cells are known as Bio-Reactors. The fluidized bed bioreactor is similar to the packed bed reactor in many
respects, but the packing material is expanded by the upward movement of fluid through the bed. The expanded
porosity of the fluidized bed packing material can be varied by controlling the flow rate of the fluid. The
fluidized media provides an extremely large surface area on which a film of microorganisms can grow and
produce a large inventory of biomass in a small rector volume. The result of this biological growth is a system
capable of high degradative performance for target contaminants in a relatively small and economical reactor
volume.
In the past, designs of biological wastewater treatment processes were based on the empirical
parameters developed by experience, which included hydraulic loading, organic loading and retention time.
Nowadays, the design utilizes empirical as well as rational parameters based on biological kinetic equations.
These equations describe growth of biological solids, substrate utilization rates, food-to-microorganisms ratio,
and the mean cell residence time. Reactor volume, substrate utilization, biomass growth, and the effluent quality
can be calculated from these equations [9] . Biokinetic coefficients used in the design of Bio-reactors include
specific growth rate (μ), maximum rate of substrate utilization per unit mass of microorganisms (k), half
velocity constant (ks), maximum cell yield (Y), and endogenous decay coefficient (kd) [10]
2. Biokinetics Of Removal Of Bod…
2
II. EXPERIMENTAL SETUP
A laboratory scale FBBR is constructed for experimental purpose consisting of three Acrylic glass columns of
120cm height and 6.9cm dia each arranged parallel to each other with valves at top and bottom of the columns
to regulate the flow through them, as shown in Fig1. A flow meter is arranged on inlet pipe to measure rate of
flow, flexible pipes of 1 inch dia. are used as inlet and outlet pipes, and wire mesh is provided to separate the
inlet and outlet zones. An arrangement for sending compressed air is provided at the bottom of the columns.
About 15 litres of sample from the domestic municipal wastewater treatment plant located in port area,
Visakhapatnam is collected each day and diluted to 1:4 concentrations and is used as stock solution for
experimentation. A 5 litre capacity plastic jar with open top is used for biomass acclimatization. A concentrated
solution is prepared by crushing tomatoes in the jar and mixing with small amount of water and the wet and dry
sludge collected from domestic sewage plant. The ingredients are mixed thoroughly everyday for aerobic
growth of microorganisms. The process is continued for a week and the slurry obtained at the end in the jar is
introduced in to the experimental columns which act as seed for biomass acclimatization on bed particles in the
columns.
III. METHODOLOGY
The acclimatized biomass is transferred to the experimental columns and the columns are filled with
water for three days before the start of experiment, and then the experiment is started by pumping the effluent
taken from the municipal wastewater treatment plant. The BOD and COD values of the effluent before pumping
are determined. The samples from outlet of the experimental columns are collected at intervals of 30min, 60min,
90 min and the respective BOD & COD values are determined. Simultaneously, the rate of flow is measured.
The same experiment is carried out with different bed materials. The process is continued till the constant
percentage removals of BOD and COD are obtained.
IV. ANALYSIS OF SAMPLES
The influent and effluent samples are analyzed for BOD & COD values using standard methods. i.e., by D.O
test and standard reflux method respectively.
V. REACTION RATE CONSTANTS
Reaction rate coefficients are determined using the experimental results obtained, in the method of integration.
The method of integration involves the substitution of the measured data on the amount of reactant remaining at
various times into the integrated form of the rate expression. Plots of the integrated forms of the reaction rate
expressions used to determine the reaction rate coefficients are as follows
Zero Order Reaction:
rc = dc/dt = k
Integrated form is
Ceff = Ci-(k*t) --------- (Eq.1)
K is determined by plotting graphically (Ci-Ceff) versus t
First Order Reaction:
rc = dc/dt = kc
Integrated form is
Ceff = Ci*e(-k*t)
--------- (Eq.2)
K is determined by plotting graphically –ln(Ci/Ceff) versus t
3. Biokinetics Of Removal Of Bod…
3
Second Order Reaction:
rc = dc/dt = kc
2
Integrated form is
Ceff=(Ci/(1-k*Ci*t)) --------- (Eq.3)
K is determined by plotting graphically (Ci-Ceff)/(Ci*Ceff) versus t
where
Ci = influent concentration (mg/L)
Ceff = effluent concentration (mg/L)
t = Duration (days)
VI. MICROBIAL GROWTH CONSTANTS
The specific substrate utilization rate, (dF/dt)/X represents the “food -to-micro-organisms ratio", substrate
utilization rate (U), or, the "process loading factor”, when considered on a finite mass and time basis.
U =(∆F/∆t)/Xm --------- (Eq.4)
in which ∆F/ ∆t = amount of food utilized "per unit time of ∆ t”,
Xm = mass of the active micro-organisms in the reactor. Using above Eqs., reduces to the following form:
1/ θc = Y.U - kd --------- (Eq.5)
And the specific growth rate ‘µ’ is obtained by the equation
µ = (∆X/∆t)/Xm --------- (Eq.6)
The above Equation is the basic or the controlling equation in any biological reactor of this type.
Finally, the following equation can be used to find the micro organism decay coefficient
Ceff = Ci – X(1+kd θc) /Y --------- (Eq.7)
Where
Ceff = concentration of the effluent, mg/l
Ci = concentration of the influent, mg/l
X = microbial mass concentration
kd = micro organism decay coefficient
θc = mean cell residence time.
VII. RESULTS AND DISCUSSIONS
Experiments are conducted using the methodology explained above with commercially available MBBR
media (plastic), Pumice stones, and Foam Pieces as bed materials, and the sewage samples collected from
municipal wastewater treatment plant Port area, Visakhapatnam. The percentage removals of BOD and COD in
the sewage sample at different operation times using MBBR Media (Plastic),Pumice Stones and Foam Pieces as
bed materials are shown vide Fig 2 to 7. The Maximum Percent Removals of BOD and COD using different
bed materials are presented in following Table 1.
Table 1 The maximum percentage removals of BOD and COD at different operation times and for different bed
materials
S.No Bed material
Acclimatization/Ex
perimental duration
(days)
Operation
time(minutes)
Maximum percentage removal
BOD COD
1
MBBR
media(Plastic)
15 30 75.74 57.12
15 60 77.16 61.35
15 90 81.42 67.02
2 Pumice stones
14 30 75.56 59.23
14 60 78.13 67.25
14 90 83.11 75.16
3 Foam Pieces
12 30 80.10 69.08
12 60 83.08 72.31
12 90 85.03 78.51
4. Biokinetics Of Removal Of Bod…
4
Maximum percentage removals are obtained when Foam Pieces are used as bed material. Also, the
experimental duration/acclimatization period of the reactor is found to be less, with Foam Pieces as bed
material. From Table 1, it is observed that the maximum percentage removal for BOD is found to be 85.03%,
83.11%, 81.42% for the bed materials Foam Pieces, Pumice stones, and commercially available MBBR media
respectively, at an operation time of 90 minutes. Similarly, the maximum percentage removals of COD are
found to be 78.51%, 75.16%, 67.02% respectively, for the bed materials in the same order. The experimental
duration/the acclimatization period is found to be 12, 14, and 15 days against the bed materials Foam Pieces,
Pumice stones, and commercially available MBBR media (plastic) respectively. From these results it is
5. Biokinetics Of Removal Of Bod…
5
observed that, Foam Pieces is found to be a good alternative for the commercially available MBBR media
(plastic) which are made up of plastic material.
VIII. STUDY ON REACTION RATE KINETICS
The study on Reaction Rate Coefficients is conducted as explained in the topic V, where three different
reaction rate models are taken into consideration viz., Zero order, First order and Second order reaction. After
analyzing the values, Plots of the integrated forms of the reaction rate expressions (Eqns 1,2,3) are used to
determine the reaction rate coefficients ‘k’. The reaction rate kinetics of the experimental programme confirms
to first order reaction rate kinetics.. The reaction rate coefficients (k) obtained for the first order reaction rate of
the experimental programme conducted with three different bed materials ranged from 0.01 day-1 to 0.15 day-1
and are shown vide Fig 8 to 13. These are in agreement with the earlier experimental works [1, 10, 11 and 13].
At the same time coefficients are found to be more for the experiment with Foam Pieces as bed material.
IX. STUDY ON MICROBIAL GROWTH KINETICS
The study of Microbial growth kinetics as explained in the Topic VI is conducted and the microbial
decay coefficients (kd) are obtained from graphs, using the specific growth rates (µ) and specific substrate
utilization rates (U) which are calculated using the equations 4 to 7. The Microbial Decay Coefficients (kd) for
the removal of BOD and COD using different bed materials is presented in Table 2 below. It is observed that,
the microbial decay coefficient (kd) are found to be increasing against the following order of bed materials. i.e.,
Pumice stones, MBBR media (plastic), and Foam Pieces for different operation times and at the end of the
acclimatization period. Maximum microbial decay coefficient ‘kd’ values are obtained when Foam Pieces is
used as bed material when compared to Pumice stones and MBBR media (plastic). Also the Microbial decay
coefficients are well in agreement with earlier works[8].
Table 2 The Microbial Decay Coefficients (kd) for the removal of BOD and COD using different bed materials.
S.No Bed material Operation time
(minutes)
Microbial Decay
Coefficient (kd), day-1
BOD COD
1
MBBR Media
(Plastic)
30 0.0034 0.1532
60 0.0038 0.1012
90 0.0044 0.0216
2 Pumice stones
30 0.0023 0.0697
60 0.0027 0.0194
90 0.0032 0.0381
3 Foam Pieces
30 0.0075 0.2395
60 0.0073 0.1179
90 0.0073 0.0134
6. Biokinetics Of Removal Of Bod…
6
X. CONCLUSIONS
1) The acclimatization periods of the bio reactor are found to be 15, 14 and 12 days against the usage of commercially
available MBBR media (plastic), Pumice stones and Foam Pieces as bed materials respectively.
2) The maximum percent removal of BOD and COD are found to be more against Foam Pieces as a bed material,at an
operation time of 90 minutes and at the end of the acclimatization period.
3) The reaction rate kinetics of the experimental programme confirms to first order reaction rate kinetics and the reaction rate
coefficients (k) obtained are in agreement with the earlier experimental works.
4) The microbial decay coefficient (kd) are found to be increasing against the following order of bed materials. i.e., Pumice
stones, MBBR media (plastic), and Foam Pieces for different operation times and at the end of the acclimatization period
and the values obtained for BOD and COD are in agreement with the earlier experimental works.
5) Therefore, it can be concluded that, Foam Pieces can be used as a better alternative against the commercially available
MBBR media (plastic) for the removal of both BOD and COD in floating bed bio-reactors.
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