Waste stabilization ponds can effectively treat domestic wastewater through natural bioremediation processes involving bacterial consortiums and microalgae. Microalgae grow quickly in the ponds, absorbing nitrogen and phosphorus pollutants that would otherwise cause eutrophication. The microalgae also produce oxygen and remove heavy metals. The harvested algal biomass can then be processed into high-value bioproducts like biofuels. However, additional nutrients may need to be added to match the microalgae's requirements, and developing efficient harvesting technologies remains a challenge. Overall, waste stabilization ponds provide a sustainable way to clean wastewater while producing microalgal feedstocks for bioproducts.
USING BIOABSORBENTS TO REDUCE RIVER WATER POLLUTION: A REVIEWijiert bestjournal
In present scenario,the river water has become wastewater due to disposal of city waste through which it flows. Most of the existing wastewater treatment plants are getting overload because of unexpected rapid urbanization and due to change in life style of common man. With such a pitch dark fut ure of fresh water we have to think out of the box for new,better and efficient treatment method. In the recent years biosorption have emerged as an economical and environmental friendly method for the decontamination of polluted water in which impurities sequestering by different parts of the cell can occur via various processes:complexation,chelation,coordination,ion exchange,precipitation,and reduction. Biosorption is a process with some unique characteristics. It can effectively sequester dissolved metal s from very dilute complex solutions with high efficiency. This makes biosorption an ideal candidate for the trea tment of high volume low concentration complex waste-waters.. The paper reviews the work carried out by different researchers about the topic and discusses the remedies in brief. The paper is a part of series of research papers under whic h the objectives stated below are studied and researched.
ER Publication,
IJETR, IJMCTR,
Journals,
International Journals,
High Impact Journals,
Monthly Journal,
Good quality Journals,
Research,
Research Papers,
Research Article,
Free Journals, Open access Journals,
erpublication.org,
Engineering Journal,
Science Journals,
USING BIOABSORBENTS TO REDUCE RIVER WATER POLLUTION: A REVIEWijiert bestjournal
In present scenario,the river water has become wastewater due to disposal of city waste through which it flows. Most of the existing wastewater treatment plants are getting overload because of unexpected rapid urbanization and due to change in life style of common man. With such a pitch dark fut ure of fresh water we have to think out of the box for new,better and efficient treatment method. In the recent years biosorption have emerged as an economical and environmental friendly method for the decontamination of polluted water in which impurities sequestering by different parts of the cell can occur via various processes:complexation,chelation,coordination,ion exchange,precipitation,and reduction. Biosorption is a process with some unique characteristics. It can effectively sequester dissolved metal s from very dilute complex solutions with high efficiency. This makes biosorption an ideal candidate for the trea tment of high volume low concentration complex waste-waters.. The paper reviews the work carried out by different researchers about the topic and discusses the remedies in brief. The paper is a part of series of research papers under whic h the objectives stated below are studied and researched.
ER Publication,
IJETR, IJMCTR,
Journals,
International Journals,
High Impact Journals,
Monthly Journal,
Good quality Journals,
Research,
Research Papers,
Research Article,
Free Journals, Open access Journals,
erpublication.org,
Engineering Journal,
Science Journals,
Extraction of Bio-Fuel from Algae by Anaerobic DigestionEditor IJMTER
The growing energy demand across the globe has instigated us to synthesize bio-fuel
from algae, a renewable resource. Algae Botryococcus braunii when subjected to anaerobic digestion
and broken down by enzymes liberate methane and CO2. The CO2 obtained is cultivated in open
ponds and are passed through a fluidised bed chamber after pre-treatment. The chamber contains
enzymes which breakdown the algal colloid into fatty acids. These fatty acids on decomposition
release CO2 that is internally cycled for algal cultivation and the methane can be profitably and
cleanly extracted. This methane can be used as a fuel in vehicles (CNG) and also in various industrial
and domestic fields, providing a low-cost solution to the global energy crisis.
Removal of Heavy Metals from Waste Water Using Water HyacinthIDES Editor
Water pollution has become one of the most serious
problems of today’s civilization. In the last few years
considerable amount of research has been done on the
potential of aquatic macrophytes for pollutant removal or even
as bio-indicators for heavy metals in aquatic ecosystems. Water
hyacinth is one of the aquatic plant species successfully used
for wastewater treatment. It is very efficient in removing
pollutants like suspended solids, BOD, organic matter, heavy
metals and pathogens. This paper mainly focuses on the
treatment of waste water using the plant ‘water hyacinth’ and
has given emphasis to the removal of heavy metals by the
plant. Water hyacinth’ could grow in sewage; they absorb and
digest the pollutants in wastewater, thus converting sewage
effluents to relatively clean water. Thus, the plants hold
promise as a natural water purification system, which could
be established at a fraction of the cost of a conventional sewage
treatment facility. The study conducted in this regard revealed
how efficiently wastewater could be treated using the plant
‘Water hyacinth’.
ABSTRACT- Wastewater treatment is a problem of grave concern in most developing countries. In the last two decades, there has been a lot of research to develop appropriate technologies to alleviate pollution in water resources. Efficient wastewater treatments through conventional methods are expensive and difficult to get optimum results. Currently, phytoremediation is an effective and affordable solution used to remediate toxic pollutants from aquatic ecosystems. The review describes various aquatic plants, which have high potential to remove heavy metals from wastewater. Key-words- Water pollution, Heavy metals, Phytoremediation, Aquatic plants, Wastewater treatment
The organic manure has become quite very popular these days due to several factors. Here is the process of the decomposition and preparation of the organic manure in very brief for understanding.
Heavy Metals in Irrigated Crops along Tatsawarki River in Kano, NigeriaIJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
International Journal of Modern Engineering Research (IJMER) covers all the fields of engineering and science: Electrical Engineering, Mechanical Engineering, Civil Engineering, Chemical Engineering, Computer Engineering, Agricultural Engineering, Aerospace Engineering, Thermodynamics, Structural Engineering, Control Engineering, Robotics, Mechatronics, Fluid Mechanics, Nanotechnology, Simulators, Web-based Learning, Remote Laboratories, Engineering Design Methods, Education Research, Students' Satisfaction and Motivation, Global Projects, and Assessment…. And many more.
Isolation and Screening of Hydrogen Producing Bacterial Strain from Sugarcane...Editor IJCATR
The aim of this study is to isolate a highly competent bacterium with potent cellulose degrading capability and a better
hydrogen producer. Soil sample from sugarcane bagasse yard was isolated, serially diluted and plated on cellulose specific nutrient
agar plate. Four colonies have been isolated in which a single colony has potent cellulose degrading ability and the highest hydrogen
productivity of 275.13 mL H2 L-1. The newly isolated bacterium was morphologically and biochemically characterized. The
molecular characterization of the bacterium was carried out using 16S rDNA sequencing and the organism was identified as
Bacilllus subtilis AuChE413. Proteomic analysis such as MALDI-TOF was carried out to differentiate the isolated Bacillus subtilis
from Bacillus thuringiensis and Bacillus amyloliquefaciens. Phylogenetic tree was constructed to analyze the evolutionary
relationship among different genus and species with the newly isolated strain.
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.
Extraction of Bio-Fuel from Algae by Anaerobic DigestionEditor IJMTER
The growing energy demand across the globe has instigated us to synthesize bio-fuel
from algae, a renewable resource. Algae Botryococcus braunii when subjected to anaerobic digestion
and broken down by enzymes liberate methane and CO2. The CO2 obtained is cultivated in open
ponds and are passed through a fluidised bed chamber after pre-treatment. The chamber contains
enzymes which breakdown the algal colloid into fatty acids. These fatty acids on decomposition
release CO2 that is internally cycled for algal cultivation and the methane can be profitably and
cleanly extracted. This methane can be used as a fuel in vehicles (CNG) and also in various industrial
and domestic fields, providing a low-cost solution to the global energy crisis.
Removal of Heavy Metals from Waste Water Using Water HyacinthIDES Editor
Water pollution has become one of the most serious
problems of today’s civilization. In the last few years
considerable amount of research has been done on the
potential of aquatic macrophytes for pollutant removal or even
as bio-indicators for heavy metals in aquatic ecosystems. Water
hyacinth is one of the aquatic plant species successfully used
for wastewater treatment. It is very efficient in removing
pollutants like suspended solids, BOD, organic matter, heavy
metals and pathogens. This paper mainly focuses on the
treatment of waste water using the plant ‘water hyacinth’ and
has given emphasis to the removal of heavy metals by the
plant. Water hyacinth’ could grow in sewage; they absorb and
digest the pollutants in wastewater, thus converting sewage
effluents to relatively clean water. Thus, the plants hold
promise as a natural water purification system, which could
be established at a fraction of the cost of a conventional sewage
treatment facility. The study conducted in this regard revealed
how efficiently wastewater could be treated using the plant
‘Water hyacinth’.
ABSTRACT- Wastewater treatment is a problem of grave concern in most developing countries. In the last two decades, there has been a lot of research to develop appropriate technologies to alleviate pollution in water resources. Efficient wastewater treatments through conventional methods are expensive and difficult to get optimum results. Currently, phytoremediation is an effective and affordable solution used to remediate toxic pollutants from aquatic ecosystems. The review describes various aquatic plants, which have high potential to remove heavy metals from wastewater. Key-words- Water pollution, Heavy metals, Phytoremediation, Aquatic plants, Wastewater treatment
The organic manure has become quite very popular these days due to several factors. Here is the process of the decomposition and preparation of the organic manure in very brief for understanding.
Heavy Metals in Irrigated Crops along Tatsawarki River in Kano, NigeriaIJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
International Journal of Modern Engineering Research (IJMER) covers all the fields of engineering and science: Electrical Engineering, Mechanical Engineering, Civil Engineering, Chemical Engineering, Computer Engineering, Agricultural Engineering, Aerospace Engineering, Thermodynamics, Structural Engineering, Control Engineering, Robotics, Mechatronics, Fluid Mechanics, Nanotechnology, Simulators, Web-based Learning, Remote Laboratories, Engineering Design Methods, Education Research, Students' Satisfaction and Motivation, Global Projects, and Assessment…. And many more.
Isolation and Screening of Hydrogen Producing Bacterial Strain from Sugarcane...Editor IJCATR
The aim of this study is to isolate a highly competent bacterium with potent cellulose degrading capability and a better
hydrogen producer. Soil sample from sugarcane bagasse yard was isolated, serially diluted and plated on cellulose specific nutrient
agar plate. Four colonies have been isolated in which a single colony has potent cellulose degrading ability and the highest hydrogen
productivity of 275.13 mL H2 L-1. The newly isolated bacterium was morphologically and biochemically characterized. The
molecular characterization of the bacterium was carried out using 16S rDNA sequencing and the organism was identified as
Bacilllus subtilis AuChE413. Proteomic analysis such as MALDI-TOF was carried out to differentiate the isolated Bacillus subtilis
from Bacillus thuringiensis and Bacillus amyloliquefaciens. Phylogenetic tree was constructed to analyze the evolutionary
relationship among different genus and species with the newly isolated strain.
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.
FABRICATION OF A SIMPLE BUBBLE COLUMN CO2 CAPTURE UNIT UTILIZING MICROALGAE ijbbjournal
This paper focuses on the fabrication of a vertical column CO2 bioreactor and the experimentation of
microalgae. On the manufacturing aspect of the project, the base design was modelled on Solidworks and
assigned a material. The model was then loaded onto a finite element analysis (FEA) software to determine
various engineering stresses and strains to confirm the specimen’s strength. Once the simulation had
completed, the model was ready for 3-D printing. The species of microalgae to be used in this study was
Chlorella Vulgaris. The medium solution was prepared by mixing many types of salts suitable for this type
of algae. Experimental trials of algae growth were conducted mainly to see whether the algae would indeed
grow more rapidly using the developed medium. After failure in early trials, some experiments were
conducted to determine which concentration of stock solution would be the most ideal for the algae to grow
in. These early experiments proved the major impacts of the concentration of the medium on the rate of
growth of the algae. The knowledge gained in these experiments will be instrumental during the next stages
of this project.
FABRICATION OF A SIMPLE BUBBLE COLUMN CO2 CAPTURE UNIT UTILIZING MICROALGAEijbbjournal
This paper focuses on the fabrication of a vertical column CO2 bioreactor and the experimentation of
microalgae. On the manufacturing aspect of the project, the base design was modelled on Solidworks and
assigned a material. The model was then loaded onto a finite element analysis (FEA) software to determine
various engineering stresses and strains to confirm the specimen’s strength. Once the simulation had
completed, the model was ready for 3-D printing. The species of microalgae to be used in this study was
Chlorella Vulgaris. The medium solution was prepared by mixing many types of salts suitable for this type
of algae. Experimental trials of algae growth were conducted mainly to see whether the algae would indeed
grow more rapidly using the developed medium. After failure in early trials, some experiments were
conducted to determine which concentration of stock solution would be the most ideal for the algae to grow
in. These early experiments proved the major impacts of the concentration of the medium on the rate of
growth of the algae. The knowledge gained in these experiments will be instrumental during the next stages
of this project.
Dissertation ppt biostimulation- a potential practice for wastewater treaat...Sumer Pankaj
Phycoremediation is a green technology that supports the direct use of living green microalgae for in situ, or in place removal, degradation, of contaminants in soils, sludge, sediments, surface water and ground waters by the mechanisms of bio-transformation, bio-accumulation, bio-concentration, bio-sparging.
It can be said by the current study that microalgae has a great potential for the treatment of industrial and municipal wastewaters as compared to the chemical treatments available commercially. Biological systems are much more efficient in cleaning the excess nutrients from the waste water followed by generation of valuable biomass which can be applied in the food, fertilizer, energy production as use of inorganic chemicals like lime and ferrous sulphate generates huge amount of sludge in textile industries, but on the other hand static anaerobic treatment using acclimatized MLSS gives better colour reduction with zero sludge generation. Microalgal cells can be used in free form to treat waste waters containing high C.O.D., high ammonical nitrogen and high TDS. It not only provides a better reduction of chemicals from wastewaters but it also helps to reduce the operational cost of ETP. Microalgaes not only helps to remediate industrial waste waters but also to treat sweage water and to restore natural water bodies like lakes and ponds. As they are active in remediating the chemicals but also it shows an antagonistic effect against some pathogenic germs like total coliforms and fecal coliforms.
These microalgal cells can also be combined with bacterial biomass of activated sludge process to develop an Algal-Bacterial consortium (ALBA) for better enhancement in the reduction of chemicals from the wastewaters as this symbiotic relation of algae and bacteria provides high satiability of the microalgae along with MLSS and faceable in terms of price and economy for instance the bacterial biomass provides carbon dioxide to algal cells for photosynthesis and in return the bacteria acquires oxygen from algae. The harvested biomass from the ETP’s can be used as bio-fertilizers as it consists of appropriate ratio of vital macro and micro nutrients like N,P,K etc. which enhance the growth of plantlets. It can also be used as aqua feeds for shrimps, fishes and molluscs. Furthermore these microlgal cells are non-toxic in the environment as it becomes a part of food chain and do not cause eutrophication. Therefore, micro-algal based treatment is most suitable for the treating the waste waters and restoring the natural water bodies as compared to other chemical treatments.
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.
Micro RNA genes and their likely influence in rice (Oryza sativa L.) dynamic ...Open Access Research Paper
Micro RNAs (miRNAs) are small non-coding RNAs molecules having approximately 18-25 nucleotides, they are present in both plants and animals genomes. MiRNAs have diverse spatial expression patterns and regulate various developmental metabolisms, stress responses and other physiological processes. The dynamic gene expression playing major roles in phenotypic differences in organisms are believed to be controlled by miRNAs. Mutations in regions of regulatory factors, such as miRNA genes or transcription factors (TF) necessitated by dynamic environmental factors or pathogen infections, have tremendous effects on structure and expression of genes. The resultant novel gene products presents potential explanations for constant evolving desirable traits that have long been bred using conventional means, biotechnology or genetic engineering. Rice grain quality, yield, disease tolerance, climate-resilience and palatability properties are not exceptional to miRN Asmutations effects. There are new insights courtesy of high-throughput sequencing and improved proteomic techniques that organisms’ complexity and adaptations are highly contributed by miRNAs containing regulatory networks. This article aims to expound on how rice miRNAs could be driving evolution of traits and highlight the latest miRNA research progress. Moreover, the review accentuates miRNAs grey areas to be addressed and gives recommendations for further studies.
Willie Nelson Net Worth: A Journey Through Music, Movies, and Business Venturesgreendigital
Willie Nelson is a name that resonates within the world of music and entertainment. Known for his unique voice, and masterful guitar skills. and an extraordinary career spanning several decades. Nelson has become a legend in the country music scene. But, his influence extends far beyond the realm of music. with ventures in acting, writing, activism, and business. This comprehensive article delves into Willie Nelson net worth. exploring the various facets of his career that have contributed to his large fortune.
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Introduction
Willie Nelson net worth is a testament to his enduring influence and success in many fields. Born on April 29, 1933, in Abbott, Texas. Nelson's journey from a humble beginning to becoming one of the most iconic figures in American music is nothing short of inspirational. His net worth, which estimated to be around $25 million as of 2024. reflects a career that is as diverse as it is prolific.
Early Life and Musical Beginnings
Humble Origins
Willie Hugh Nelson was born during the Great Depression. a time of significant economic hardship in the United States. Raised by his grandparents. Nelson found solace and inspiration in music from an early age. His grandmother taught him to play the guitar. setting the stage for what would become an illustrious career.
First Steps in Music
Nelson's initial foray into the music industry was fraught with challenges. He moved to Nashville, Tennessee, to pursue his dreams, but success did not come . Working as a songwriter, Nelson penned hits for other artists. which helped him gain a foothold in the competitive music scene. His songwriting skills contributed to his early earnings. laying the foundation for his net worth.
Rise to Stardom
Breakthrough Albums
The 1970s marked a turning point in Willie Nelson's career. His albums "Shotgun Willie" (1973), "Red Headed Stranger" (1975). and "Stardust" (1978) received critical acclaim and commercial success. These albums not only solidified his position in the country music genre. but also introduced his music to a broader audience. The success of these albums played a crucial role in boosting Willie Nelson net worth.
Iconic Songs
Willie Nelson net worth is also attributed to his extensive catalog of hit songs. Tracks like "Blue Eyes Crying in the Rain," "On the Road Again," and "Always on My Mind" have become timeless classics. These songs have not only earned Nelson large royalties but have also ensured his continued relevance in the music industry.
Acting and Film Career
Hollywood Ventures
In addition to his music career, Willie Nelson has also made a mark in Hollywood. His distinctive personality and on-screen presence have landed him roles in several films and television shows. Notable appearances include roles in "The Electric Horseman" (1979), "Honeysuckle Rose" (1980), and "Barbarosa" (1982). These acting gigs have added a significant amount to Willie Nelson net worth.
Television Appearances
Nelson's char
Artificial Reefs by Kuddle Life Foundation - May 2024punit537210
Situated in Pondicherry, India, Kuddle Life Foundation is a charitable, non-profit and non-governmental organization (NGO) dedicated to improving the living standards of coastal communities and simultaneously placing a strong emphasis on the protection of marine ecosystems.
One of the key areas we work in is Artificial Reefs. This presentation captures our journey so far and our learnings. We hope you get as excited about marine conservation and artificial reefs as we are.
Please visit our website: https://kuddlelife.org
Our Instagram channel:
@kuddlelifefoundation
Our Linkedin Page:
https://www.linkedin.com/company/kuddlelifefoundation/
and write to us if you have any questions:
info@kuddlelife.org
"Understanding the Carbon Cycle: Processes, Human Impacts, and Strategies for...MMariSelvam4
The carbon cycle is a critical component of Earth's environmental system, governing the movement and transformation of carbon through various reservoirs, including the atmosphere, oceans, soil, and living organisms. This complex cycle involves several key processes such as photosynthesis, respiration, decomposition, and carbon sequestration, each contributing to the regulation of carbon levels on the planet.
Human activities, particularly fossil fuel combustion and deforestation, have significantly altered the natural carbon cycle, leading to increased atmospheric carbon dioxide concentrations and driving climate change. Understanding the intricacies of the carbon cycle is essential for assessing the impacts of these changes and developing effective mitigation strategies.
By studying the carbon cycle, scientists can identify carbon sources and sinks, measure carbon fluxes, and predict future trends. This knowledge is crucial for crafting policies aimed at reducing carbon emissions, enhancing carbon storage, and promoting sustainable practices. The carbon cycle's interplay with climate systems, ecosystems, and human activities underscores its importance in maintaining a stable and healthy planet.
In-depth exploration of the carbon cycle reveals the delicate balance required to sustain life and the urgent need to address anthropogenic influences. Through research, education, and policy, we can work towards restoring equilibrium in the carbon cycle and ensuring a sustainable future for generations to come.
WRI’s brand new “Food Service Playbook for Promoting Sustainable Food Choices” gives food service operators the very latest strategies for creating dining environments that empower consumers to choose sustainable, plant-rich dishes. This research builds off our first guide for food service, now with industry experience and insights from nearly 350 academic trials.
Characterization and the Kinetics of drying at the drying oven and with micro...Open Access Research Paper
The objective of this work is to contribute to valorization de Nephelium lappaceum by the characterization of kinetics of drying of seeds of Nephelium lappaceum. The seeds were dehydrated until a constant mass respectively in a drying oven and a microwawe oven. The temperatures and the powers of drying are respectively: 50, 60 and 70°C and 140, 280 and 420 W. The results show that the curves of drying of seeds of Nephelium lappaceum do not present a phase of constant kinetics. The coefficients of diffusion vary between 2.09.10-8 to 2.98. 10-8m-2/s in the interval of 50°C at 70°C and between 4.83×10-07 at 9.04×10-07 m-8/s for the powers going of 140 W with 420 W the relation between Arrhenius and a value of energy of activation of 16.49 kJ. mol-1 expressed the effect of the temperature on effective diffusivity.
![Volume 3 • Issue 6 • 1000e113
J Bioremed Biodeg
ISSN: 2155-6199 JBRBD, an open access journal
Research Article Open Access
Rahman et al., J Bioremed Biodeg 2012, 3:6
http://dx.doi.org/10.4172/2155-6199.1000e113
Editorial Open Access
Bioremediation & Biodegradation
Domestic wastewater treatment and remediation is an expensive
process due to significant time and planning needed for successful
treatment. Modern wastewater treatment plants are highly mechanized
and expensive to build and maintain. In less economically developed
parts of the world alternative methods of wastewater treatment are
required. Waste stabilization ponds, or lagoons, provide an ideal
solution for wastewater treatment in developing countries and rural
areas. These ponds facilitate the oxidation of organic matter through
complex symbiotic relationships between bacterial consortiums and
assimiliation of wastewater nutrients by photoautorophic microalgae
[1]. In the United States more than 7,000 lagoon systems are used to
treat domestic wastewater (U.S. EPA, 2002, Report No. EPA 832-F02-
014) [2]. Most domestic wastewater is considered weak or medium
in strength with nitrogen levels between 20-40 mg/L and phosphorus
levels between 4-8 mg/L [3]. These concentrations of nitrogen and
phosphorus are undesirable as they can lead to considerable pollution
and eutrophication of downstream waterways [1].
Open pond lagoon systems have many advantages over
mechanicalized methods and are able to remove nitrogen and
phosphorus to required EPA levels. Interestingly, nitrogen and
phosphorus found in weak domestic wastewater are at an ideal level
for microalgae cultivation and growth. Microalgae can grow to high
densities by assimilating nitrogen and phosphorus, thus removing
these inorganic nutrients from the wastewater. In addition, open pond
lagoon systems also allow ideal mixing and adequate light exposure for
microalgae growth. Microalgae play a vital role in recycling carbon in
the biosphere by converting carbon dioxide into organic compounds
through photosynthesis [2], while also producing oxygen via the
oxidation of water. Metal compounds such as Cr, Cu, Pb, Cd, Mn, As,
Fe, Ni, Hg, and Zn can also be bioremediated by microalgae. Microalgae
such as Chlorella and Scenedesmus have shown tolerance and
bioremediation capabilities to certain heavy metals [4]. Additionally,
microalgae have been used for the bioremediation of textile dyes in
wastewater from industrial textile processes. These bioremediation
capabilities of microalgae are useful for environmental sustainability
and algal biomass can be used as feedstock for the production of high
energy compounds [5,6].
Algal biomass can be processed chemically and biologically to
produce high value products such as bioacetone, biobutanol, biodiesel,
and biomethane. Microalgae as feedstocks provide high densities of
carbohydrates (typically comprising glucose units), triacylglycerides
and free fatty acids that can be used to produce biofuels and biodiesel.
It has been demonstrated that microalgae can be a promising feedstock
and will play a vital role in the future production of clean and renewable
energy [1,5].
The disadvantages to an open pond lagoon system are that the
microalgae nutrient requirement may not match the stoichiometric
ratio of the microalgae biomass, where the optimum nitrogen to
phosphorus ratio for microalgae growth is 16:1. Thus, photoautotrophic
bioremediation of inorganic compounds might not be carried out to
adequate levels. To meet nutrient requirements for microalgae growth,
additional chemicals (usually nitrogen rich sources) may need to be
supplemented to the wastewater, which is undesirable.
Microalgae grown in open pond lagoon systems are at low densities
and specialized harvesting technologies need to be implemented in
order obtain suitable biomass yields. Harvesting techniques such as a
Rotating Algal Biofilm Reactor (RABR) [2], filtration, sedimentation,
and dissolved air flotation (DAF) units can be employed to harvest the
microalgae from open pond lagoon systems. There are advantages and
disadvantages to each method, but the cost of harvesting is currently
high and more efficient technologies need to be created [1].
To summarize, waste stabilization ponds provide an active
bioremediation system to clean domestic wastewater, and they can
also produce microalgal feedstocks for the production of high value
bioproducts. Interest in the use of microalgae will continue to grow as
rural cities and developing countries look for sustainable and affordable
ways to clean domestic wastewater. Processes where wastewater
is bioremediated through heterotrophic and photoautotrophic
organisms, and in turn high value bioproducts are generated have great
potential to stimulate regional and local economic development [1].
References
1. Christenson L, Sims R (2011) Production and harvesting of microalgae for
wastewater treatment, biofuels, and bioproducts. Biotechnol Adv 29: 686-702.
2. Christenson LB, Sims RC (2012) Rotating algal biofilm reactor and spool
harvester for wastewater treatment with biofuels by-products. Biotechnol
Bioeng 109: 1674-1684.
3. Tchobanoglous G, Burton F (1991) Wastewater engineering: treatment,
disposal, and reuse. McGraw-Hill.
4. Pinto E, Sigaud-kutner TCS, Leitão MAS, Okamoto OK, Morse D, et al. (2003)
Heavy metal-induced oxidative stress in algae. J Phycol 39: 1008-1018.
5. Ellis JT, Hengge NN, Sims RC, Miller CD (2012) Acetone, butanol, and ethanol
production from wastewater algae. Bioresour Technol 111: 491-495.
6. Lim SL, Chu WL, Phang SM (2010) Use of Chlorella vulgaris for bioremediation
of textile wastewater. Bioresour Technol 101: 7314-7322.
*Corresponding author: Charles D Miller, Department of Biological Engineering,
Utah State University, 4105 Old Main Hill, Logan, UT 84322-4105, USA, Tel: 435-
797-2593; Fax: 435-797-1248; E-mail: Charles.miller@usu.edu
Received May 22, 2012; Accepted May 24, 2012; Published May 26, 2012
Citation: Rahman A, Ellis JT, Miller CD (2012) Bioremediation of Domestic
Wastewater and Production of Bioproducts from Microalgae Using Waste
Stabilization Ponds. J Bioremed Biodeg 3:e113. doi:10.4172/2155-6199.1000e113
Copyright: © 2012 Rahman A, et al. This is an open-a ccess article distributed
under the terms of the Creative Commons Attribution License, which permits
unrestricted use, distribution, and reproduction in any medium, provided the
original author and source are credited.
Bioremediation of Domestic Wastewater and Production of Bioproducts
from Microalgae Using Waste Stabilization Ponds
Asif Rahman, Joshua T Ellis and Charles D. Miller*
Department of Biological Engineering, Utah State University, USA
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