IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
The document describes research into optimizing the degradation of Acid Blue 193 dye using UV/peroxydisulfate oxidation. Response surface methodology was used to investigate the effects of initial K2S2O8 concentration, UV irradiation, temperature, and initial dye concentration on color removal and reaction kinetics. Central composite design experiments showed that maximum color removal (100%) and reaction rate (0.086 min-1) occurred under conditions of 5 mM initial K2S2O8, 250 W UV irradiation, 50°C temperature, and 40 mg/L initial dye concentration. The study provides optimized conditions for degrading Acid Blue 193 dye using UV/peroxydisulfate oxidation.
This document summarizes a study that optimized the removal of two ionic dyes (Reactive Blue 19 and Acid Black 172) from textile wastewater using nanofiltration. Response surface methodology was used to evaluate the effect of operating parameters including feed concentration, pressure, and pH on dye removal efficiency. The results showed that increasing dye concentration and pH enhanced removal efficiency, while increasing pressure above 0.8 MPa decreased efficiency. Maximum predicted removals of 97% and 94% were achieved under optimized conditions for each dye, respectively. Nanofiltration is proposed as an effective alternative to reverse osmosis for treating textile wastewater at lower pressure and fouling.
Homogeneous Photocatalytic Degradation of Acid Alizarin Black Using Hydrogen ...Haydar Mohammad Salim
This document summarizes research on degrading the acid dye Alizarin Black using hydrogen peroxide and UV light (UV/H2O2). The research aims to study how the degradation of Alizarin Black is affected by dye concentration, hydrogen peroxide concentration, and pH. Results showed that degradation was most effective at a dye concentration of 100 mg/L and increased with higher hydrogen peroxide amounts. Degradation was also favored under neutral conditions compared to acidic or basic conditions. Kinetic studies found pseudo-first order degradation rates increased with higher hydrogen peroxide volumes and decreased with higher dye concentrations.
Removal of dye from polluted water using novel nano manganese oxide-based mat...Dr. Md. Aminul Islam
Dyes are priority pollutants, commonly found at significant concentrations in textile effluents. The presence of dyes stuffs in wastewater can cause severe problems to aquatic life and human beings. Therefore, the removal of dyes from wastewater is important in order to minimize their hazardous effects on the environment. One way of removing dyes is to use nanosized manganese oxides (MnOs). To date, there has been much work reported on the use of nanosized MnOs as sorbents for dyestuffs. They are promising sorbents for commercial use due to their amorphous nature, high specific surface areas (SSA), mesoporous structure, and low to the moderate point of zero charge (pHPZC). This review summarizes the toxicity and recent advances for removing dyes from wastewater using nanosized MnO sorbents. The article also describes the various experimental parameters necessary for adsorption optimization, such as adsorption time, pH, initial dye concentration, amount of sorbent and temperature. Adsorption mechanisms investigated by various modeling approaches are also discussed. In particular, it was observed that much work has been reported on the use of birnessite and its composites for dye removal. There are many papers reporting on the use of MnO in batch mode dye removal, but very few that report on the use of MnO in continuous column removal systems. Therefore, there is still a considerable need for further research to develop effective and economical large scale MnO column systems for commercial use.
IRJET- Colours Removal using Iron Oxide Nano PaarticlesIRJET Journal
The document summarizes a study on using iron oxide nanoparticles to remove two types of dyes (Reactive green 19A and Direct yellow 12) from aqueous solutions. Key findings include:
1) Reactive green 19A removal was most efficient at alkaline pH 9, while Direct yellow 12 removal worked best at neutral pH 7.
2) Dye removal efficiency decreased as the initial dye concentration increased.
3) The highest dye removal rates of 99.99% for Reactive green 19A and 99.9% for Direct yellow 12 were achieved with 400mg of iron oxide nanoparticles at a contact time of 80 minutes and initial dye concentration of 10mg/L.
Use of titanium dioxide photocatalysis on the remediationBruno B Garcia
This study investigated the photocatalytic degradation of two azo dyes found in textile wastewater using titanium dioxide (TiO2) photocatalysis. The effects of TiO2 concentration, UV irradiation time, solution pH, initial dye concentration, and hydrogen peroxide concentration on degradation were examined. Optimal conditions for highest degradation rates were determined. Results showed that complete decolorization of solutions could be achieved using an efficient photocatalyst under suitable operational parameters.
Treatment of textile wastewater using electrofenton processIAEME Publication
This document summarizes a study on using the electrofenton process to treat textile wastewater. The electrofenton process uses iron ions and hydrogen peroxide to generate hydroxyl radicals that can break down organic pollutants in wastewater. The researchers used a Box-Behnken design and response surface methodology to evaluate the effects of pH, iron dosage, current, and electrolysis time on treating synthetic textile wastewater. Their results showed that under optimal conditions, the process could achieve up to 86% removal of chemical oxygen demand and 70% removal of dye from the wastewater.
This document summarizes a study on treating tannery effluent through enhanced primary treatment using coagulants. Tannery effluent was collected and its physical and chemical parameters were analyzed. The effluent was then treated with alum, ferric sulfate, and a combination of both coagulants. Conditions like pH and coagulant dosages were optimized. The combination of alum and ferric sulfate was found to be most effective at removing pollutants like total suspended solids, biological oxygen demand, chemical oxygen demand, and chromium from the effluent. At optimal dosages, this coagulant combination helped meet certain national effluent discharge standards.
The document describes research into optimizing the degradation of Acid Blue 193 dye using UV/peroxydisulfate oxidation. Response surface methodology was used to investigate the effects of initial K2S2O8 concentration, UV irradiation, temperature, and initial dye concentration on color removal and reaction kinetics. Central composite design experiments showed that maximum color removal (100%) and reaction rate (0.086 min-1) occurred under conditions of 5 mM initial K2S2O8, 250 W UV irradiation, 50°C temperature, and 40 mg/L initial dye concentration. The study provides optimized conditions for degrading Acid Blue 193 dye using UV/peroxydisulfate oxidation.
This document summarizes a study that optimized the removal of two ionic dyes (Reactive Blue 19 and Acid Black 172) from textile wastewater using nanofiltration. Response surface methodology was used to evaluate the effect of operating parameters including feed concentration, pressure, and pH on dye removal efficiency. The results showed that increasing dye concentration and pH enhanced removal efficiency, while increasing pressure above 0.8 MPa decreased efficiency. Maximum predicted removals of 97% and 94% were achieved under optimized conditions for each dye, respectively. Nanofiltration is proposed as an effective alternative to reverse osmosis for treating textile wastewater at lower pressure and fouling.
Homogeneous Photocatalytic Degradation of Acid Alizarin Black Using Hydrogen ...Haydar Mohammad Salim
This document summarizes research on degrading the acid dye Alizarin Black using hydrogen peroxide and UV light (UV/H2O2). The research aims to study how the degradation of Alizarin Black is affected by dye concentration, hydrogen peroxide concentration, and pH. Results showed that degradation was most effective at a dye concentration of 100 mg/L and increased with higher hydrogen peroxide amounts. Degradation was also favored under neutral conditions compared to acidic or basic conditions. Kinetic studies found pseudo-first order degradation rates increased with higher hydrogen peroxide volumes and decreased with higher dye concentrations.
Removal of dye from polluted water using novel nano manganese oxide-based mat...Dr. Md. Aminul Islam
Dyes are priority pollutants, commonly found at significant concentrations in textile effluents. The presence of dyes stuffs in wastewater can cause severe problems to aquatic life and human beings. Therefore, the removal of dyes from wastewater is important in order to minimize their hazardous effects on the environment. One way of removing dyes is to use nanosized manganese oxides (MnOs). To date, there has been much work reported on the use of nanosized MnOs as sorbents for dyestuffs. They are promising sorbents for commercial use due to their amorphous nature, high specific surface areas (SSA), mesoporous structure, and low to the moderate point of zero charge (pHPZC). This review summarizes the toxicity and recent advances for removing dyes from wastewater using nanosized MnO sorbents. The article also describes the various experimental parameters necessary for adsorption optimization, such as adsorption time, pH, initial dye concentration, amount of sorbent and temperature. Adsorption mechanisms investigated by various modeling approaches are also discussed. In particular, it was observed that much work has been reported on the use of birnessite and its composites for dye removal. There are many papers reporting on the use of MnO in batch mode dye removal, but very few that report on the use of MnO in continuous column removal systems. Therefore, there is still a considerable need for further research to develop effective and economical large scale MnO column systems for commercial use.
IRJET- Colours Removal using Iron Oxide Nano PaarticlesIRJET Journal
The document summarizes a study on using iron oxide nanoparticles to remove two types of dyes (Reactive green 19A and Direct yellow 12) from aqueous solutions. Key findings include:
1) Reactive green 19A removal was most efficient at alkaline pH 9, while Direct yellow 12 removal worked best at neutral pH 7.
2) Dye removal efficiency decreased as the initial dye concentration increased.
3) The highest dye removal rates of 99.99% for Reactive green 19A and 99.9% for Direct yellow 12 were achieved with 400mg of iron oxide nanoparticles at a contact time of 80 minutes and initial dye concentration of 10mg/L.
Use of titanium dioxide photocatalysis on the remediationBruno B Garcia
This study investigated the photocatalytic degradation of two azo dyes found in textile wastewater using titanium dioxide (TiO2) photocatalysis. The effects of TiO2 concentration, UV irradiation time, solution pH, initial dye concentration, and hydrogen peroxide concentration on degradation were examined. Optimal conditions for highest degradation rates were determined. Results showed that complete decolorization of solutions could be achieved using an efficient photocatalyst under suitable operational parameters.
Treatment of textile wastewater using electrofenton processIAEME Publication
This document summarizes a study on using the electrofenton process to treat textile wastewater. The electrofenton process uses iron ions and hydrogen peroxide to generate hydroxyl radicals that can break down organic pollutants in wastewater. The researchers used a Box-Behnken design and response surface methodology to evaluate the effects of pH, iron dosage, current, and electrolysis time on treating synthetic textile wastewater. Their results showed that under optimal conditions, the process could achieve up to 86% removal of chemical oxygen demand and 70% removal of dye from the wastewater.
This document summarizes a study on treating tannery effluent through enhanced primary treatment using coagulants. Tannery effluent was collected and its physical and chemical parameters were analyzed. The effluent was then treated with alum, ferric sulfate, and a combination of both coagulants. Conditions like pH and coagulant dosages were optimized. The combination of alum and ferric sulfate was found to be most effective at removing pollutants like total suspended solids, biological oxygen demand, chemical oxygen demand, and chromium from the effluent. At optimal dosages, this coagulant combination helped meet certain national effluent discharge standards.
IRJET- Dye Removal from Low Cost Adsorbent :- A ReviewIRJET Journal
This document reviews the use of low-cost adsorbents for removing dyes from wastewater. It discusses how dyes from industries like textiles can pollute water sources and harm the environment if discharged without treatment. The document examines various physical, chemical, and biological treatment methods and finds that adsorption is effective at removing different types of dyes. It explores using agricultural waste as low-cost adsorbents, noting their adsorption capacity depends on factors like contact time and dye properties. The document concludes that adsorption is an affordable alternative to treatments like membrane filtration or ozonation that are effective but costly for dye removal from wastewater.
IRJET- Effects of New Era Coagulants on Properties of Industrial Wastewat...IRJET Journal
This document summarizes research on using new coagulants like poly aluminium chloride (PAC), aluminium chlorohydrate (ACH), and magnesium chloride to treat industrial wastewater. Specifically, it examines their effects on properties like chemical oxygen demand (COD), turbidity, and pH levels. The document reviews studies on treating:
1) Textile wastewater containing dyes like reactive black 5, disperse blue, and congo red. Maximum decolorization and COD reduction was achieved using MgCl2/lime or FeSO4/lime.
2) Molasses spent wash from alcohol distilleries. Collective chemical and biological pretreatment methods were studied for decolorizing anaer
Biodegradations of Reactive Blue-Dye Using Fresh Water Microalgae Tadele Assefa Aragaw
The document summarizes a study on the biodegradation of reactive blue dye using freshwater microalgae. The objectives were to investigate the effects of dye concentration, temperature, pH, and incubation time on biodegradation. Maximum decolorization of 82.6% was achieved at 50mg/l dye concentration, 30°C temperature, and pH 8 over 20 days. Green microalgae like Chlorella and Scenedesmus were effective at biodegrading the dye under optimal conditions. FTIR analysis indicated the dye's chromophore structure was destroyed into smaller molecules. The study demonstrates that microalgae have potential for cost-effective treatment of dye-contaminated wastewater.
Removal of basic dye from aqueous solution by adsorption on melon husk inAlexander Decker
This document discusses a study that investigated the adsorption behavior of the cationic dye methylene blue in single, binary, and ternary solutions using melon husk as an adsorbent. Experiments showed that adsorption equilibrium was reached within 120 minutes for all systems. Kinetic data fit best to a pseudo-second order model. Isotherm data fit best to the Langmuir model for single systems and Freundlich model for binary and ternary systems. Adsorption was found to be thermodynamically feasible and exothermic for single and binary systems but endothermic for ternary systems.
Removal of Methylene Blue from Aqueous Solution by Adsorption using Low Cost ...ijsrd.com
The present study deals with removal of methylene blue (basic dye)from aqueous solution using a low cost activated carbon prepared from Delonix regia(gulmohar seed pods).Batch adsorption studies were conducted by varying the contact time adsorbent dosage and pH
The document investigates the efficiency of a photo-Fenton-like process (UV/H2O2/Fe0) for removing the pesticide diazinon from aqueous solutions. Key findings include:
1) Optimal parameters for diazinon removal were an H2O2 to Fe0 molar ratio of 1:1, pH of 4, reaction time of 30 minutes, and initial diazinon concentration of 10 mg/L.
2) Under these conditions, diazinon removal and COD reduction were 83.05% and 71.34% respectively.
3) The photo-Fenton-like process is suggested as an effective pretreatment for biological
Decolourisation of Nigrosine WS dye by Solar Photo-fentonAkash Tikhe
My master's dissertation thesis topic- Decolorization of Nigrosine WS dye by Homogeneous Solar Photo-Fenton Method along with Intro, Method, Result, conclusion and suggestions.
Decolorization of mixture of dyes: A critical reviewGJESM Publication
Water plays a vital and essential role in our ecosystem. This natural resource is becoming scarce, making
its availability a major social and economic concern. Use of a large variety of synthetic dyes in textile industries has raised an hazardous environmental alert. About 17 - 20% of freshwater pollution is caused by textile effluents. These effluents are recalcitrant to biodegradation and cause acute toxicity to the receiving water bodies, as these comprised of various types of toxic dyes, which are difficult to remove. Decolorisation of textile wastewater is therefore important before releasing it into the nearby local waterways. It therefore becomes essential to degrade the toxic chemicals of textile wastewater, so as to avoid the hazardous environmental effects. Several treatment methods have been employed to embark upon the problem of dye removal but degradation becomes further more difficult for effluents containing dye matrix. The
review study has been an attempt to present the different diversified attempts used for decolorisation of a mixture of dyes.
Dye effluents impose hazardous effects on human beings as well as on environment. The present powerpoint deals with some of the decolourization techniques that can be adopted for treating wastewater containing toxic dyes and chemicals
This document summarizes a study that investigated the adsorption of lead (Pb) from aqueous solution using modified beech sawdust. Some key findings include:
- Maximum Pb removal efficiency of 91.3% occurred at pH 5, while minimum efficiency of 28.04% occurred at pH 7. Maximum adsorption capacity was 0.3841 mg/g.
- As the initial Pb concentration increased from 1 to 7 mg/L, removal efficiency decreased from 91.3% to 33.88%. Increasing adsorbent dose from 2 to 8 g/L improved removal efficiency from 50% to 97.3%.
- Removal efficiency had a decreasing trend after equilibrium was reached
#scichallenge2017 Photocatalytic Degradation of Synthetic Wastewaters Contain...Seher Elif Mekik
#scichallenge2017
In our project, it was aimed to purify wastewaters containing methylene blue component and harmful to environment from methylene blue. For this purpose, synthetic methylene blue waste water was formed and chemically treated by photocatalysis.
Dye removal from waste water by using low cost adsorbent: A review Satish Movaliya
This document provides a literature review on using low-cost adsorbents for dye removal from wastewater. It discusses various adsorbents that have been used such as sugarcane bagasse, sawdust, coconut coir pith, and clay. The review examines factors that affect dye adsorption such as pH, adsorbent dosage, and contact time. It also discusses commonly used isotherm models like Langmuir and Freundlich to analyze adsorption equilibrium. The review concludes that more research is needed to develop efficient, selective, and eco-friendly low-cost adsorbents as well as continuous processes and desorption methods.
adsorption of methylene blue onto xanthogenated modified chitosan microbeadsSiti Nadzifah Ghazali
This document presents a study on using xanthogenated-modified chitosan microbeads (XMCM) to remove methylene blue dye from wastewater. The study characterized XMCM using FTIR, pH, and pHzpc analysis. Batch experiments examined the effect of adsorbent dosage and initial pH on dye removal efficiency. Equilibrium isotherm data fitted well to the Langmuir model, indicating monolayer adsorption. The maximum adsorption capacity of XMCM for methylene blue was determined to be 21.62 mg/g. The study demonstrated the potential of XMCM for wastewater treatment applications.
The document summarizes the synthesis and characterization of zeolite from coal fly ash and its application in removing inorganic and organic pollutants from wastewater. Key points:
- Zeolite was synthesized from coal fly ash via an alkali fusion process followed by hydrothermal treatment. The synthesized zeolite was characterized using various techniques.
- Batch adsorption studies were conducted to investigate the ability of synthesized zeolite to remove heavy metals like copper, cadmium, lead and dye (safranin) from wastewater. Parameters like contact time, dose, pH and concentration were optimized.
- Adsorption isotherm models like Langmuir, Freundlich, Tem
Adsorption of Rhodamine – B Dye from Aqueous Solution by Aloe Vera as Bio – A...IRJET Journal
This document summarizes a study on using Aloe vera as a bio-adsorbent for removing Rhodamine B dye from aqueous solutions. Batch adsorption experiments were conducted to examine the effects of parameters like pH, adsorbent dosage, dye concentration, contact time and temperature. The maximum dye removal occurred at pH 5, adsorbent dosage of 50 mg, and temperature of 60°C. Equilibrium data fit the Langmuir isotherm model well. The results indicate that Aloe vera is an effective adsorbent for removing Rhodamine B dye from water.
STUDIES ON TREATMENT OF PHARMACEUTICAL WASTE EFFLUENTS BY POLYMER MATERIALS M...EDITOR IJCRCPS
In the present study, sorption technique was used to achieve the optimum recovery of the pharmaceutical waste from effluents.
The modified urea formaldehyde resin was prepared and mixed with inorganic adsorbent at various proportions. The removal
capabilities of pharmaceutical waste by the prepared composite materials were investigated. Different factors affecting the uptake
such as contact time, pH value and aqueous volume to resin weight ratio have been investigated. The reaction mechanisms and
the optimum conditions for the treatment were deduced in the light of the obtained results.
Keywords: Sorption technique, Pharmaceutical waste, Different factors.
This document describes a study that prepared chitosan from waste prawn shells and evaluated its performance as an adsorbent for Remazol Red dye. Chitosan was characterized using various analytical tools and showed good thermal stability. Batch experiments were conducted to determine the effects of pH, contact time, and initial dye concentration on adsorption capacity. Maximum adsorption of 313.4 mg/g occurred at pH 3.0 after 30 minutes. Experimental data fit the Langmuir isotherm model and followed pseudo-second order kinetics. The study demonstrated that chitosan can be effectively used as a low-cost adsorbent for Remazol Red dye removal from wastewater.
This document summarizes a study on the removal of Safranin dye from aqueous solution using sodium phosphate (NaP) zeolite synthesized from coal fly ash. The study investigated the thermodynamic and kinetic properties of Safranin dye adsorption onto the synthesized zeolite. Characterization techniques including XRF, SEM, XRD and FTIR were used to analyze the zeolite. Batch adsorption experiments showed maximum dye removal of 97.14% at an equilibrium pH of 9.0, adsorbent dose of 5 g/L, and contact time of 180 minutes. Adsorption data fitted well to Langmuir and Freundlich isotherm models. Kinetic data showed best fit
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
1) The document presents a numerical study to improve the efficiency of jet ejectors.
2) A new technique is proposed to minimize the momentum difference between the motive and propelled fluids by forcing the propelled stream using a blower.
3) Computational fluid dynamics simulations show that reducing the momentum difference in this way increases the ejector efficiency from 54.5% to 94.1% by reducing kinetic energy losses during mixing.
IRJET- Dye Removal from Low Cost Adsorbent :- A ReviewIRJET Journal
This document reviews the use of low-cost adsorbents for removing dyes from wastewater. It discusses how dyes from industries like textiles can pollute water sources and harm the environment if discharged without treatment. The document examines various physical, chemical, and biological treatment methods and finds that adsorption is effective at removing different types of dyes. It explores using agricultural waste as low-cost adsorbents, noting their adsorption capacity depends on factors like contact time and dye properties. The document concludes that adsorption is an affordable alternative to treatments like membrane filtration or ozonation that are effective but costly for dye removal from wastewater.
IRJET- Effects of New Era Coagulants on Properties of Industrial Wastewat...IRJET Journal
This document summarizes research on using new coagulants like poly aluminium chloride (PAC), aluminium chlorohydrate (ACH), and magnesium chloride to treat industrial wastewater. Specifically, it examines their effects on properties like chemical oxygen demand (COD), turbidity, and pH levels. The document reviews studies on treating:
1) Textile wastewater containing dyes like reactive black 5, disperse blue, and congo red. Maximum decolorization and COD reduction was achieved using MgCl2/lime or FeSO4/lime.
2) Molasses spent wash from alcohol distilleries. Collective chemical and biological pretreatment methods were studied for decolorizing anaer
Biodegradations of Reactive Blue-Dye Using Fresh Water Microalgae Tadele Assefa Aragaw
The document summarizes a study on the biodegradation of reactive blue dye using freshwater microalgae. The objectives were to investigate the effects of dye concentration, temperature, pH, and incubation time on biodegradation. Maximum decolorization of 82.6% was achieved at 50mg/l dye concentration, 30°C temperature, and pH 8 over 20 days. Green microalgae like Chlorella and Scenedesmus were effective at biodegrading the dye under optimal conditions. FTIR analysis indicated the dye's chromophore structure was destroyed into smaller molecules. The study demonstrates that microalgae have potential for cost-effective treatment of dye-contaminated wastewater.
Removal of basic dye from aqueous solution by adsorption on melon husk inAlexander Decker
This document discusses a study that investigated the adsorption behavior of the cationic dye methylene blue in single, binary, and ternary solutions using melon husk as an adsorbent. Experiments showed that adsorption equilibrium was reached within 120 minutes for all systems. Kinetic data fit best to a pseudo-second order model. Isotherm data fit best to the Langmuir model for single systems and Freundlich model for binary and ternary systems. Adsorption was found to be thermodynamically feasible and exothermic for single and binary systems but endothermic for ternary systems.
Removal of Methylene Blue from Aqueous Solution by Adsorption using Low Cost ...ijsrd.com
The present study deals with removal of methylene blue (basic dye)from aqueous solution using a low cost activated carbon prepared from Delonix regia(gulmohar seed pods).Batch adsorption studies were conducted by varying the contact time adsorbent dosage and pH
The document investigates the efficiency of a photo-Fenton-like process (UV/H2O2/Fe0) for removing the pesticide diazinon from aqueous solutions. Key findings include:
1) Optimal parameters for diazinon removal were an H2O2 to Fe0 molar ratio of 1:1, pH of 4, reaction time of 30 minutes, and initial diazinon concentration of 10 mg/L.
2) Under these conditions, diazinon removal and COD reduction were 83.05% and 71.34% respectively.
3) The photo-Fenton-like process is suggested as an effective pretreatment for biological
Decolourisation of Nigrosine WS dye by Solar Photo-fentonAkash Tikhe
My master's dissertation thesis topic- Decolorization of Nigrosine WS dye by Homogeneous Solar Photo-Fenton Method along with Intro, Method, Result, conclusion and suggestions.
Decolorization of mixture of dyes: A critical reviewGJESM Publication
Water plays a vital and essential role in our ecosystem. This natural resource is becoming scarce, making
its availability a major social and economic concern. Use of a large variety of synthetic dyes in textile industries has raised an hazardous environmental alert. About 17 - 20% of freshwater pollution is caused by textile effluents. These effluents are recalcitrant to biodegradation and cause acute toxicity to the receiving water bodies, as these comprised of various types of toxic dyes, which are difficult to remove. Decolorisation of textile wastewater is therefore important before releasing it into the nearby local waterways. It therefore becomes essential to degrade the toxic chemicals of textile wastewater, so as to avoid the hazardous environmental effects. Several treatment methods have been employed to embark upon the problem of dye removal but degradation becomes further more difficult for effluents containing dye matrix. The
review study has been an attempt to present the different diversified attempts used for decolorisation of a mixture of dyes.
Dye effluents impose hazardous effects on human beings as well as on environment. The present powerpoint deals with some of the decolourization techniques that can be adopted for treating wastewater containing toxic dyes and chemicals
This document summarizes a study that investigated the adsorption of lead (Pb) from aqueous solution using modified beech sawdust. Some key findings include:
- Maximum Pb removal efficiency of 91.3% occurred at pH 5, while minimum efficiency of 28.04% occurred at pH 7. Maximum adsorption capacity was 0.3841 mg/g.
- As the initial Pb concentration increased from 1 to 7 mg/L, removal efficiency decreased from 91.3% to 33.88%. Increasing adsorbent dose from 2 to 8 g/L improved removal efficiency from 50% to 97.3%.
- Removal efficiency had a decreasing trend after equilibrium was reached
#scichallenge2017 Photocatalytic Degradation of Synthetic Wastewaters Contain...Seher Elif Mekik
#scichallenge2017
In our project, it was aimed to purify wastewaters containing methylene blue component and harmful to environment from methylene blue. For this purpose, synthetic methylene blue waste water was formed and chemically treated by photocatalysis.
Dye removal from waste water by using low cost adsorbent: A review Satish Movaliya
This document provides a literature review on using low-cost adsorbents for dye removal from wastewater. It discusses various adsorbents that have been used such as sugarcane bagasse, sawdust, coconut coir pith, and clay. The review examines factors that affect dye adsorption such as pH, adsorbent dosage, and contact time. It also discusses commonly used isotherm models like Langmuir and Freundlich to analyze adsorption equilibrium. The review concludes that more research is needed to develop efficient, selective, and eco-friendly low-cost adsorbents as well as continuous processes and desorption methods.
adsorption of methylene blue onto xanthogenated modified chitosan microbeadsSiti Nadzifah Ghazali
This document presents a study on using xanthogenated-modified chitosan microbeads (XMCM) to remove methylene blue dye from wastewater. The study characterized XMCM using FTIR, pH, and pHzpc analysis. Batch experiments examined the effect of adsorbent dosage and initial pH on dye removal efficiency. Equilibrium isotherm data fitted well to the Langmuir model, indicating monolayer adsorption. The maximum adsorption capacity of XMCM for methylene blue was determined to be 21.62 mg/g. The study demonstrated the potential of XMCM for wastewater treatment applications.
The document summarizes the synthesis and characterization of zeolite from coal fly ash and its application in removing inorganic and organic pollutants from wastewater. Key points:
- Zeolite was synthesized from coal fly ash via an alkali fusion process followed by hydrothermal treatment. The synthesized zeolite was characterized using various techniques.
- Batch adsorption studies were conducted to investigate the ability of synthesized zeolite to remove heavy metals like copper, cadmium, lead and dye (safranin) from wastewater. Parameters like contact time, dose, pH and concentration were optimized.
- Adsorption isotherm models like Langmuir, Freundlich, Tem
Adsorption of Rhodamine – B Dye from Aqueous Solution by Aloe Vera as Bio – A...IRJET Journal
This document summarizes a study on using Aloe vera as a bio-adsorbent for removing Rhodamine B dye from aqueous solutions. Batch adsorption experiments were conducted to examine the effects of parameters like pH, adsorbent dosage, dye concentration, contact time and temperature. The maximum dye removal occurred at pH 5, adsorbent dosage of 50 mg, and temperature of 60°C. Equilibrium data fit the Langmuir isotherm model well. The results indicate that Aloe vera is an effective adsorbent for removing Rhodamine B dye from water.
STUDIES ON TREATMENT OF PHARMACEUTICAL WASTE EFFLUENTS BY POLYMER MATERIALS M...EDITOR IJCRCPS
In the present study, sorption technique was used to achieve the optimum recovery of the pharmaceutical waste from effluents.
The modified urea formaldehyde resin was prepared and mixed with inorganic adsorbent at various proportions. The removal
capabilities of pharmaceutical waste by the prepared composite materials were investigated. Different factors affecting the uptake
such as contact time, pH value and aqueous volume to resin weight ratio have been investigated. The reaction mechanisms and
the optimum conditions for the treatment were deduced in the light of the obtained results.
Keywords: Sorption technique, Pharmaceutical waste, Different factors.
This document describes a study that prepared chitosan from waste prawn shells and evaluated its performance as an adsorbent for Remazol Red dye. Chitosan was characterized using various analytical tools and showed good thermal stability. Batch experiments were conducted to determine the effects of pH, contact time, and initial dye concentration on adsorption capacity. Maximum adsorption of 313.4 mg/g occurred at pH 3.0 after 30 minutes. Experimental data fit the Langmuir isotherm model and followed pseudo-second order kinetics. The study demonstrated that chitosan can be effectively used as a low-cost adsorbent for Remazol Red dye removal from wastewater.
This document summarizes a study on the removal of Safranin dye from aqueous solution using sodium phosphate (NaP) zeolite synthesized from coal fly ash. The study investigated the thermodynamic and kinetic properties of Safranin dye adsorption onto the synthesized zeolite. Characterization techniques including XRF, SEM, XRD and FTIR were used to analyze the zeolite. Batch adsorption experiments showed maximum dye removal of 97.14% at an equilibrium pH of 9.0, adsorbent dose of 5 g/L, and contact time of 180 minutes. Adsorption data fitted well to Langmuir and Freundlich isotherm models. Kinetic data showed best fit
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
1) The document presents a numerical study to improve the efficiency of jet ejectors.
2) A new technique is proposed to minimize the momentum difference between the motive and propelled fluids by forcing the propelled stream using a blower.
3) Computational fluid dynamics simulations show that reducing the momentum difference in this way increases the ejector efficiency from 54.5% to 94.1% by reducing kinetic energy losses during mixing.
This document summarizes an experiment to optimize the performance of an aluminum dross crusher using the Taguchi method of design of experiments. The researchers identified three parameters that affect the crusher's performance: blade profile, rotation speed, and duration. They conducted experiments using an L9 orthogonal array with these parameters set at different levels. Analysis of the results found that blade profile and duration were significant parameters, while rotation speed was not. Confirmation experiments at the optimized parameter settings increased the aluminum recovery rate from 60% to an average of 75%.
El documento resume los conceptos básicos del clima, incluyendo cómo se miden la temperatura y las precipitaciones. Explica los principales factores que influyen en el clima como la latitud, altitud, distancia al mar y relieve. Luego describe los diferentes tipos de clima que se dan en España, como el clima mediterráneo típico, mediterráneo interior, mediterráneo seco, oceánico, de montaña y sub tropical.
El documento argumenta que es necesario cambiar el enfoque del profesorado hacia un modelo más flexible e individualizado para adaptarse a la diversidad de alumnos. Propone que la formación del profesorado debe enfocarse en desarrollar una mentalidad más abierta a las necesidades cambiantes de la sociedad y en capacitar a los profesores para implementar estrategias pedagógicas inclusivas.
Este documento é uma revista da Marré Infinito que apresenta novas coleções de joias, incluindo a coleção Femme ID inspirada na força das mães da savana. A revista também discute experiências da seção Porta Jóias, onde clientes compartilham suas peças da Marré Infinito, e incentiva leitoras a organizarem seus próprios eventos Porta Jóias.
O documento resume os resultados do projeto Transformar no ano de 2010 na região de Ilhéus, BA. O projeto formou 51 jovens em cursos de solda e manutenção industrial e capacitou 180 adultos em grupos produtivos como produção de peixe e geléias. Os principais desafios incluem melhorar equipamentos, gestão dos grupos e ampliar mercados.
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Oxidation of Acetaminophen by Fluidized-bed Fenton Process: Optimization usin...Oswar Mungkasa
prepared by M.C. Lu*, R.M. Briones**, and M.D.G. de Luna**, *** *Department of Environmental Resources Management, Chia Nan University of Pharmacy and Science, Tainan 717, Taiwan (E-mail: mmclu@mail.chna.edu.tw) ** Environmental Engineering Graduate Program, University of the Philippines, 1011 Diliman, Quezon City, Philippines (Email: rowenambriones@yahoo.com) *** Department of Chemical Engineering, University for Urban Environments in Asia, 25-28 May 2011, Manila, Philippines. organized by International Water Association (IWA).
TREATMENT OF DISTILLERY EFFLUENT BY USING ADVANCED OXIDATION PROCESSIRJET Journal
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The document discusses research on optimizing the extraction of rotenone from Derris elliptica roots. It aims to determine processing parameters that maximize the yield of rotenoids resin, rotenone content, and biological activity (LC50). Preliminary experiments identified suitable ranges for solvent type, solvent-to-solid ratio, and raw material particle size. A 2k factorial design was used to evaluate these parameters. Results showed ethanol extraction at a lower solvent ratio and smaller particle size maximized yields, while acetone extraction was best at a higher ratio and larger particle size. Verification experiments confirmed the optimized parameters.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
This document provides a short review of biological treatment methods for petroleum refinery wastewater. It discusses the characteristics of refinery wastewater, including various hydrocarbons and dissolved minerals. It then summarizes different categories of biological wastewater treatment systems, including suspended growth methods like activated sludge and sequencing batch reactors, attached growth methods, and hybrid systems. It also compares the performance of these different biological treatment methods and some of the advantages and disadvantages of each approach.
Activation of hydrogen peroxide by chemical reagent to reduce COD in petroche...Universiti Malaysia Pahang
This document discusses reducing chemical oxygen demand (COD) in petrochemical wastewater. The objective is to reduce COD using hydrogen peroxide activated by two reagents: iron-catalyzed H2O2 (Fenton's reagent) and Al2(SO4)3-catalyzed H2O2. The methodology involves treating wastewater samples with different dosages of the reagents and hydrogen peroxide. Results show Fenton's reagent achieved 68-70% COD removal, while Al2(SO4)3 removal was not effective for COD but achieved up to 55% removal of total suspended solids.
Activation of hydrogen peroxide by chemical reagent to reduce cod in petroche...MOHAMED SAAD BALA
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The radiolytic mineralization of 2-mercaptobenzothiazole, an emerging contami...IRJESJOURNAL
Abstract:The ability of high-energy ionizing radiation has been demonstrated for environmental remediation processing. γ-rayswere applied to treat a solution of 2-mercaptobenzothiazole (2-MBT). 2-MBT (125 µM) was decomposed and mineralized by the γ-radiation. The absorbed doses for 50 and 90% 2-MBT degradation were 0.170 and 0.650 kGy, respectively. Organic by-products were almost fully mineralized when high-absorbed doses in the range of 5-60 kGy were applied. Sulfate radicals (SO4 ●– ) produced through the rapid reaction of persulfate ions (S2O8 2– ) with hydrated electrons(eaq − ; keaq − /S2O8 2– = 1.1 × 1010 M −1 .s−1 ) had a significant effect on the 2-MBT mineralization yield. Because of 2-MBT decomposition,sulfate ions (SO4 2− ) were formed, and thepH and dissolved oxygen concentration were decreased. The degradation efficiency decreased when HCO3 –was added to the 2- MBT solution. No significant effects of NO3 – and Cl– ions on 2-MBT radiolytic eliminationwere observed
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This document reviews various treatment methods that have been used to treat pharmaceutical wastewater, which can be complex and toxic. It discusses studies that have evaluated treatments like coagulation, Fenton processes, physicochemical treatments, and upflow anaerobic sludge blanket reactors. The document provides an overview of these different treatment methods and summarizes several research papers that have evaluated coagulation combined with Fenton-like processes, ozone treatment, full-scale herbal pharmaceutical wastewater treatment, Fenton-type processes, upflow anaerobic sludge blanket reactors for treating cosmetic wastewater, and other applications of Fenton oxidation for improving biodegradability and removing heavy metals from wastewater.
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Comparative Study for Adsorptive Removal of Coralene Blue BGFS Dye from Aqueo...IJERA Editor
Textile industries represent biggest impact on the environment due to high water consumption and waste water discharge as government control water pollution by setting strength regulation for waste water discharge, removal of color from waste water becomes more and more essential and attractive. Adsorption technology is very efficient in treatment of textile effluent. In this paper comparison of adsorption phenomena of textile dye Anthraquinone blue onto two different adsorbents MgO nano powder and Fe2O3 amorphous powder has been studied for removal of said dye from aqueous solutions. The adsorption of Anthraquinone blue on adsorbents occurs by studying the effects of adsorbent amount, dye concentration, contact time and pH of solution. All results found that MgO nano powder and Fe2O3 provide a fairly high dye adsorption capacity, which combined with their fulfilment of pollution control board’s standards, lack of pollution, lower environmental hazard and low-cost makes them promising for future applications. The present work also provides information on optimum value of different operating parameter for dye removal by two adsorbent.
This document summarizes pharmaceutical waste water treatment technologies. It begins with an overview of the types of waste generated from pharmaceutical industries and their environmental impacts. It then discusses various treatment parameters and processes used to treat this waste water, including:
1) Biological treatments like aerobic and anaerobic processes using activated sludge or membrane bioreactors.
2) Advanced treatments for recovery like membrane technologies, activated carbon, and membrane distillation.
3) Advanced oxidation processes like ozonation, Fenton's reaction, photocatalysis, and electrochemical oxidation.
4) Hybrid technologies that combine different treatment steps are effective for chemical synthesis and fermentation waste streams.
International Journal of Engineering (IJE) Volume (2) Issue (4)CSCJournals
This document summarizes an experimental study on treating distillery effluent using an aerobic reactor with sewage sludge as a seed culture. Microorganisms in the sewage sludge were isolated and identified. The reactor was operated at different initial substrate concentrations and samples analyzed over time for COD, TSS, TDS and pH. The first-order and diffusional models best described the kinetic data, showing decreasing rate constants with increasing initial concentration. The Singh model provided a poor fit. Maximum COD removals of 78-88% were achieved.
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This document summarizes a study on the biosorption of Congo Red dye using fanwort powder. The researchers characterized the fanwort powder and dye-loaded powder using FTIR, XRD, and SEM analysis. Equilibrium studies were conducted to determine the effects of contact time, biosorbent size, and pH on the biosorption process. The optimum conditions for biosorption were found to be a contact time of 40 minutes, biosorbent size of 53 μm, and pH of 5. Kinetic, isotherm, and thermodynamic studies were also included to understand the biosorption process. A Box-Behnken design was used to optimize the process parameters.
Applicability of Fenton Process for Treatment of Industrial Effluents: A ReviewIJERA Editor
Wastewater and effluent treatment has undergone innovative changes over the years. Traditional wastewater treatment has yielded to modern and path-breaking procedures which are more efficient and effective. The world of difficulties and unknown has opened new avenues and paths to highly feasible effluent treatment procedures, so the vigorous importance of advanced oxidation procedures. This review paper will delineate the increasing importance of various advanced oxidation processes including Fenton treatment for wastewater. Advanced oxidation processes (AOP’s), which involve and includes the in-situ generation of highly potent chemical oxidants such as the hydroxyl radical, have emerged as an important avenue of technologies to accelerate the non-selective oxidation and thus the destruction of a wide range of non-degradable organic contaminants in wastewater which cannot be eliminated biologically. Advanced oxidation processes (AOP) are technologies based on the generation of highly reactive species, the hydroxyl radicals, used in oxidative degradation procedures for organic compounds dissolved or dispersed in aquatic media. These processes are promising alternatives for decontamination of media containing dissolved recalcitrant organic substances, which would not be efficiently removed by conventional methods.
This document summarizes a study on using ferric oxide (Fe2O3) as an adsorbent to remove color from dye wastewater. Batch experiments were conducted with synthetic wastewater containing anthraquinone blue dye. The effects of pH, adsorbent dosage, dye concentration, and adsorption isotherms were evaluated. Maximum dye removal efficiency of 94% was achieved at pH 2 with 0.3 g of Fe2O3 adsorbent dosage and an initial dye concentration of 125 ppm. Equilibrium data fitted well to Freundlich, Langmuir, and Temkin isotherm models, indicating favorable adsorption of dye onto Fe2O3.
1. P.A.Fasnabi, C.S.Remya, G.Madhu/ International Journal of Engineering Research and
Applications (IJERA) ISSN: 2248-9622 www.ijera.com
Vol. 2, Issue 6, November- December 2012, pp.1672-1675
Degradation of Acetamiprid in Wastewater by Ozonation
P.A.Fasnabi, C.S.Remya, G.Madhu
Department of Chemical Engineering, Govt Engineering College, Thrissur-9, India
Chemical Engineering Group, School of Engineering, Cochin University of Science and Technology, Kochi-22,
India
ABSTRACT
Pesticides belong to the class of persistent studied by Benitez et al. He could obtain similar
chemicals in the environment which cause serious degradation at pH 2 and 9 which indicates the
health hazards. Advanced Oxidation Processes negligible contribution of the reaction with hydroxyl
(AOPs) represent the fast developing area in radical generated by the ozone self-decomposition at
water and wastewater treatment by which non pH 9 [12]. K.lafi et al. could obtain 90% removal of
biodegradable and difficult to biodegradable the pesticide deltamethrin using ozonation in a
compounds can be removed. This paper discusses period of 210 min [1]. Amat et al. treated a pair of
the use of ozonation for the removal of insecticide commercial anionic surfactants with ozonation in an
acetamiprid from water. Response surface alkaline medium. After only 10 min of treatment,
Methodology was used for the optimisation of the surfactants were almost completely eliminated [14].
process parameters: ozone flow rate and pH. The present work focuses on the degradation of
acetamiprid by ozonation. The effect of parameters
Keywords - Acetamiprid, Advanced Oxidation like ozone flow rate and pH were also studied.
Process, Ozonation Response surface methodology was used for
optimisation of the process.
1. INTRODUCTION
Pesticides have become an unavoidable 2. EXPERIMENTAL
commodity in our modern life. The introduction of 2.1 PROCEDURES
pesticides in the environment cause serious issues of Acetamiprid (97%) was purchased from
which water pollution is of primary importance. Rallis India. The properties of acetamiprid is given
Removal of these compounds from water is a in Table 1. Sulphuric acid and sodium hydroxide
challenge to the environmental engineers because were used for adjusting the pH. The reagents were
most of them are nonbiodegradable [1]. Acetamiprid not subjected to further purification. Distilled water
belongs to a new class of insecticides, was used for making the solutions throughout.
neonicotinoids, The use of neonicotinoids is Ozone generator of capacity 2g/hr was used as the
increasing tremendously because of their ability to source of ozone.
replace most of the organophosphates. They are Table1. Properties of Acetamiprid
commonly applied to cotton, vegetables, flowers, Common Name Acetamiprid
fruits etc. Name (IUPAC): (E)-N-[(6-chloro-3-
Most of the chemical treatment methods pyridyl)methyl]-N-cyano-N-
utilized for pesticides degradation cause the methyl acetamidin
formation of secondary pollutants. Advanced
Molecular C10H11ClN4
oxidation processes employ different methods for
Formula
generation of the hydroxyl radicals. Hydroxyl
Molecular Weight 222.68
radicals are very reactive and not highly selective.
They can convert the pollutants to CO2 and water or Pesticide Type Insecticide
atleast to degradable compounds [2-5]. Ozonation is Chemical Family Neonicotinoid Insecticide
a widely used technique for the removal of Application Sites Control of Sucking-Type
pollutants from water and wastewater[6-8]. The Insects on Leafy Vegetables,
degradation of compounds occurs through the action Fruiting Vegetables, Cole
of ozone itself as well as through the radicals Crops, Citrus Fruits, Pome
generated in aqueous medium. The major reactions Fruits, Grapes, Cotton, and
taking place are [9-11]: Ornamental Plants and
O3 + OH-→ O3.-+ OH. (1) Flowers
O3.- → O2 + O.- (2) Carrier Water
O.- + H- → OH. (3) Physical State Solid, Powder
Ozonation was utilized by Esplugas et al. for the Color White powder
removal of phenol from wastewater [9]. 100% Odour Odorless
degradation was obtained at a pH of 9.4 in 80 Solubility in 4.25 x 10+3 mg/L at 25°C
minutes. Degradation of carbofuran by ozone was Water
1672 | P a g e
2. P.A.Fasnabi, C.S.Remya, G.Madhu/ International Journal of Engineering Research and
Applications (IJERA) ISSN: 2248-9622 www.ijera.com
Vol. 2, Issue 6, November- December 2012, pp.1672-1675
The stock solution of acetamiprid p, and the significant level (1-p) are also given in the
containing 0.5 mg /cm3 was prepared using distilled Tables 3-5. It can be observed from the tables 3 to 5
water. 500ml of the solution was taken and pH was that all the terms except the interaction term of pH
adjusted using H2SO4/ NaOH. The flow rate of and ozone flow rate are highly influential in the
ozone was adjusted to the desired level and it was model for the prediction of pesticide removal, COD
passed through diffusers in to the solution for and TOC from the waste water.
2hours. After the treatment the solution was
anlaysed for COD, TOC and concentration of the Table 3: Estimated Regression coefficients and
insecticide. TOC was measured using Shimadzu corresponding p values for COD removal (%)
TOC-L-CPH analyzer. Concentration of pesticide Factor Coefficient of p value Significance
was analysed by Hitachi Elite Lachrome High the model in Level (%)
Performance Liquid Chromatograph equipped with uncoded
UV detector. The mobile phase was a mixture of factors
water /acetonitrile (70-30). It was eluted at a rate of
1 ml/min. COD was measured by standard methods Constant -266.109 0.003 >47%
[12]. A 834.206 0.002 >99%
B 313.705 0.006 >98%
2.2 RESPONSE SURFACE METHODOLOGY
Response surface methodology (RSM) is Aa -2.577 0.000 >99%
essentially a particular set of mathematical and bb -156.538 0.002 >99%
statistical methods for designing experiments,
building models, evaluating the effect of variables, ab 6.268 0.194 >80%
and searching optimum conditions of variables to
predict target responses [15-17]. Its important Table 4: Estimated Regression coefficients and
applications are in the designs, development, corresponding p values for Pesticide removal (%)
formulation of new processes, and in the Factor Coefficient p value Significance
improvement of existing designs. Its purpose is to of the model Level (%)
determine the optimum operating conditions through in uncoded
experimental methods. In this work, central factors
composite design with two factors at five levels was
applied using Minitab 15 (Minitab Inc., State Constant -7.4615 0.533 >47%
College, PA,trial version). The parameters used are A 8.5787 0.000 >99%
ozone flow rate and pH which are denoted by A and
B respectively. The levels of independent variables B 44.5947 0.022 >98%
are given in Table 2. Aa -0.5431 0.000 >99%
bb -23.5968 0.007 >99%
Table 2: Independent variables and their levels for
the central composite design ab 1.0447 0.239 >80%
Variable Coded Levels Table 4: Estimated Regression coefficients and
-α -1 0 +1 +α corresponding p values for TOC removal (%)
pH 4.38 5.5 8.25 11 12.1
39 Factor Coefficient p value Significance
Ozone 0.702 0.814 1.086 1.357 1.46 of the Level (%)
Flow rate 9 model in
(g/hr) uncoded
factors
3. RESULTS AND DISCUSSION Constant -34.1129 0.001 >47%
3.1 RESPONSE SURFACE METHODOLOGY A 4.9307 0.000 >99%
A second-order polynomial model, as B 38.4338 0.004 >98%
given in Equation 4 was fitted to the experimental
data Aa -0.3349 0.000 >99%
Y= Constant + aA + bB + aaA2 + bbB2+ abAB bb -16.822 0.003 >99%
(4) 0.2980 0.555 >45%
ab
where Y is the response variable; a and b are the
regression coefficients for linear effects; aa, bb are Equation 5 can be represented in terms of uncoded
the quadratic coefficients and ab is the interaction variables as
coefficient. The significance of the regression Y1 = -266.109 + 34.20572A + 313.705B – 2.577A2
coefficients was analyzed using p test. The values of –156.538B2 + 6.268AB
(5)
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3. P.A.Fasnabi, C.S.Remya, G.Madhu/ International Journal of Engineering Research and
Applications (IJERA) ISSN: 2248-9622 www.ijera.com
Vol. 2, Issue 6, November- December 2012, pp.1672-1675
Y2 = -7.46154 + 8.57873A + 44.5947B – 0.5431A2
Contour Plot of %TOC removal vs Ozone flowrate(g/hour), pH
– 23.5968B2 + 1.0447AB
(6) 1.4 7.5
Y3 = -34.1129 + 4.9307A + 38.4338B – 0.3349A2 – 1.3
16.8222B2 + 0.2980AB
Ozone flowrate(g/hour)
1.2
(7)
Where Y1, Y2, Y3 correspond to response of COD, 1.1
pesticide and TOC removal percentages
1.0
respectively. 2.5
0.9
3.2 EFFECT OF VARIABLES 0.8
2.5 5.0 0.0
The results of the Experimental runs are given 5 6 7 8 9 10 11 12
pH
Figure 1-3. Contour plots shows that the maximum
exists in the domain selected for study.
Fig 3: Combined Effect of pH and Ozone flow rate
Contour Plot of %COD removal vs Ozone flowrate(g/hour), pH
on TOC Removal
40
1.4 The optimum conditions predicted for the
1.3
process were pH 8.2 and ozone flow rate of
Ozone flowrate(g/hour)
1.18g/hr. The COD removal(%), pesticide removal
1.2
(%) and TOC removal at this conditions were 53.9,
1.1 56.9 and 8.7% respectively. TOC removal is low
1.0
since the degradation products of acetamiprid exist
in the medium and mineralization was not complete.
0.9
0 The optimum conditions were checked
0.8 experimentally and results obtained were close to
20
20 the predicted value.
5 6 7 8 9 10 11 12
pH
4. CONCLUSION
The ozonation process for the removal of
Fig 1: Combined Effect of pH and Ozone flow rate acetamiprid from aqueous solutions was
on COD removal investigated. As ozonation is normally used for
disinfection, the removal of pesticide is an added
Contour Plot of %Pesticide removal vs Ozone flowrate(g/hour), pH
advantage. Eventhough the degradation is not
complete, a removal efficiency of 57% was obtained
45 51
1.4 which shows that ozonation can be used as a first
1.3
step in the treatment process. The optimum pH
Ozone flowrate(g/hour)
obtained was 8.1, which shows that the process is
1.2
more effective in alkaline medium. This can be
1.1 explained by the equations 1-3. Ozonation is a
1.0
viable process for acetamiprid removal and it does
51
not produce sludge as in Fenton process.
0.9
Combination of Ozone with other reagents like
0.8 54 H2O2 and UV can be tried for improving the
45 48
48 removal of pesticide.
5 6 7 8 9 10 11 12
pH
5. ACKNOWLEDGEMENT
The authors wish to thank centre for
Fig 2: Combined Effect of pH and Ozone flow rate Engineering Research and Development (CERD),
on Pesticide Removal Kerala for financial support
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4. P.A.Fasnabi, C.S.Remya, G.Madhu/ International Journal of Engineering Research and
Applications (IJERA) ISSN: 2248-9622 www.ijera.com
Vol. 2, Issue 6, November- December 2012, pp.1672-1675
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