Research Interests: Engineering, Minerals, Optimization, Ph, Hazardous Materials, and 15 moreIron, Ammonia, Hydrogen Peroxide, Mineralization, Oxygen, Amoxicillin, Biological treatment, Operant Conditioning, Dissolved Organic Carbon, Oxidation, Biodegradability, Chemical Oxygen Demand, Ampicillin, Aqueous Solution, and DCO
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ABSTRACT
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The attempt to remove viruses from drinking water by coagulation and f locculation is a relatively recent undertaking. Past efforts produced results that ranged from poor to excellent. The authors of this article evaluate a different... more
The attempt to remove viruses from drinking water by coagulation and f locculation is a relatively recent undertaking. Past efforts produced results that ranged from poor to excellent. The authors of this article evaluate a different coagulant and reach the conclusion that it is as effective as some others tested in the past— at least when there is little or no organic matter in the raw water. They also point out some of the considerations that any user of the process must consider to make it viable. The authors have attempted to discover the extent to which viruses are removed from raw water through coagulation and flocculation.
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... Document details. Title Removal of viruses from water by chemical coagulation and flocculation. Authors CHAUDHURI, M.; ENGELBRECHT, RS Journal Journal of the American Water Works Association 1970 Vol. 62 No. 9 pp. 563-7 Record Number... more
... Document details. Title Removal of viruses from water by chemical coagulation and flocculation. Authors CHAUDHURI, M.; ENGELBRECHT, RS Journal Journal of the American Water Works Association 1970 Vol. 62 No. 9 pp. 563-7 Record Number 19712701253. Abstract. ...
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Quantities of Chrysotile Asbestos by Electron Microscopy. Anal. Chem., 45:4:809 (Apr. 1973). 9. KAY, G. Ontario Intensifies Search for Asbestos in Drinking Water. Wtr. Pollut. Control, 111:9:33 (Sept. 1973). 10. SKIKNE, MI; TALBOT, JH... more
Quantities of Chrysotile Asbestos by Electron Microscopy. Anal. Chem., 45:4:809 (Apr. 1973). 9. KAY, G. Ontario Intensifies Search for Asbestos in Drinking Water. Wtr. Pollut. Control, 111:9:33 (Sept. 1973). 10. SKIKNE, MI; TALBOT, JH & RENDALL, REG Electron ...
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The study compared the technical efficiency and economic cost of five advanced oxidation processes (Fenton, UV photo-Fenton, solar photo-Fenton, UV/TiO2/H2O2 and FeGAC/H2O2) for degradation of the pesticides chlorpyrifos cypermethrin and... more
The study compared the technical efficiency and economic cost of five advanced oxidation processes (Fenton, UV photo-Fenton, solar photo-Fenton, UV/TiO2/H2O2 and FeGAC/H2O2) for degradation of the pesticides chlorpyrifos cypermethrin and chlorothalonil in aqueous solution. The highest degradation in terms of COD and TOC removals and improvement of the biodegradability (BOD5/COD ratio) index (BI) were observed to be (i) Fenton - 69.03% (COD), 55.61% (TOC), and 0.35 (BI); (ii) UV photo-Fenton -78.56% (COD), 63.76% (TOC) and 0.38 (BI); (iii) solar photo-Fenton - 74.19% (COD), 58.32% (TOC) and 0.36 (BI); (iv) UV/TiO2/H2O2 - 53.62% (COD), 21.54% (TOC), and 0.26 (BI); and (v) the most technical efficient and cost effective process was FeGAC/H2O2. At an optimum condition (FeGAC 5 g/L, H2O2 100 mg/L, and reaction time of 60 min at pH 3), the COD and TOC removal efficiency were 96.19 and 85.60%, respectively, and the biodegradation index was 0.40. The degradation rate constant and cost wer...
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A performance evaluation and modification of the UNICEF upward-flow water filter. VP Singh, M Chaudhuri Waterlines 12:22, 29-31, 1993. Providing safe drinking-water to the rural population of the South has been a challenging task. ...
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A preliminary study was carried out to assess the usefulness of manganese as an aid in the lime clarification of municipal wastewater. The approach was intended to take advantage of the potential sorption ability of manganese oxides for... more
A preliminary study was carried out to assess the usefulness of manganese as an aid in the lime clarification of municipal wastewater. The approach was intended to take advantage of the potential sorption ability of manganese oxides for organic matter in the presence of divalent ...
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... WASTEWATER BY PHOTO FENTON PROCESS Emad Elmolla* 1 , Malay Chaudhuri 2 1Ph.D. student, Dept. of Civil Engineering, Universiti Teknologi PETRONAS (UTP), Bandar Seri Iskander, 31750 Tronoh, Perak, Malaysia 2Professor, Dept. ...
Seeds of the plant species Strychnos potatorum and Moringa oleifera contain natural polyelectrolytes which can be used as coagulants to clarify turbid waters. In laboratory tests, direct filtration of a turbid surface water (turbidity... more
Seeds of the plant species Strychnos potatorum and Moringa oleifera contain natural polyelectrolytes which can be used as coagulants to clarify turbid waters. In laboratory tests, direct filtration of a turbid surface water (turbidity 15-25 NTU, heterotrophic bacteria 280-500 cfu ml(-1), and fecal coliforms 280-500 MPN 100 ml(-1)), with seeds of S. potatorum or M. oleifera as coagulant, produced a substantial improvement in its aesthetic and microbiological quality (turbidity 0.3-1.5 NTU, heterotrophic bacteria 5-20 cfu ml(-1) and fecal coliforms 5-10 MPN 100 ml(-1)). The method appears suitable for home water treatment in rural areas of developing countries. These natural coagulants produce a 'low risk' water; however, additional disinfection or boiling should be practised during localised outbreaks/epidemics of enteric infections.
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Inorganic Mercury-Bituminous Coal Sorption Interaction in Water. MP Pandey, M Chaudhuri Water Science and Technology 13:11, 1981. Possible use of sorption of inorganic mercury on bitminous coal was studied as a method ...
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ABSTRACT This study examined the effect of operating conditions of UV Fenton pretreatment combined with aerobic sequencing batch reactor on degradation and biodegradability (BOD5/COD ratio) improvement of chlorpyrifos, cypermethrin and... more
ABSTRACT This study examined the effect of operating conditions of UV Fenton pretreatment combined with aerobic sequencing batch reactor on degradation and biodegradability (BOD5/COD ratio) improvement of chlorpyrifos, cypermethrin and chlorothalonil pesticide wastewater. The optimum operating conditions in the pretreatment phase were H2O2/COD molar ratio 2.0, H2O2/Fe2+ molar ratio 25, pH 3 and reaction time 60 min and achieved COD and TOC removal were 64.8 and 45.9% for COD and TOC removal, respectively and biodegradabilty (BOD5/COD ratio) improved from 0.02 to 0.31. In the aerobic SBR phase, five different UV Fenton operating conditions were investigated and UV F-SBR 1 appeared to be the most significant (p < 0.05). Increasing UV Fenton pretreatment time and combining the pretreated pesticide wastewater and municipal treatment plant wastewater enabled sustenance of the SBR operation. The UV Fenton-SBR (C) achieved COD and TOC removal efficiency of 96.2 and 97.4%, respectively after 40 d operation at 12 hr HRT. Effluent COD, TOC and BOD5 were 24, 19 and 18 mg L−1, respectively and BOD5/COD ratio was 0.75. Applying the Monod model, values of the biological first order kinetic constant (Kob), cell yield (Yx/s) and decay coefficients (kd) were 0.1332 hr−1, 0.5301 (mg COD mg−1 MLSS) and 0.0072 hr−1, respectively. The UV Fenton-SBR (C) process is effective in treatment of pesticide wastewater containing chlorpyrifos, cypermethrin and chlorothalonil to meet Malaysian industrial effluent discharge standard.
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Page 1. Microbial Purification in Slow Sand Filter AMAL K. DATTA" and MALAY CHAUDHURIT Environmental Engineering Laboratory, Department of Civil Engineering, Zndian Znstitute of Technology, Kanpur 20801 6, India ABSTRACT ...
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Ferrioxalate is a visible light-responsive photocatalyst. The solar ferrioxalate/ process has high degradation efficiency because ferrioxalate is able to absorb light strongly at longer wavelength and generates hydroxyl radical with high... more
Ferrioxalate is a visible light-responsive photocatalyst. The solar ferrioxalate/ process has high degradation efficiency because ferrioxalate is able to absorb light strongly at longer wavelength and generates hydroxyl radical with high quantum yield. Degradation of pesticide chlorothalonil in aqueous solution by ferrioxalate/ under solar irradiation was examined. The optimum operating conditions for treatment of a 300 mg/L chlorothalonil aqueous solution were obtained by using the central composite design of the response surface methodology. Under the optimum operating conditions (/COD molar ratio 2.75, /Fe3+molar ratio 75, /C2H2O4molar ratio 37.5, reaction time 90 min, and pH 3), COD, NH3-N, and TOC removal of 75.71, 47.11, and 54.33%, respectively, was achieved and the biodegradability (BOD5/COD ratio) improved from zero to 0.42. Model prediction and actual removal were in close agreement (<4% error). The solar ferrioxalate/H2O2process is effective in pretreatment of the chlo...
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The aim of the study was to prepare potentially cheaper carbon for the adsorptive removal of Nickle [Ni (II)] from aqueous solution. The adsorption capacity of the prepared carbon to remove Ni (II) from aqueous solution was determined and... more
The aim of the study was to prepare potentially cheaper carbon for the adsorptive removal of Nickle [Ni (II)] from aqueous solution. The adsorption capacity of the prepared carbon to remove Ni (II) from aqueous solution was determined and adsorption mechanism was investigated. Rice husk carbon was prepared by incineration in a muffle furnace. The incinerated rice husk carbon (IRHC) was characterised in terms of surface area, micropore area, micropore volume, average pore diameter and surface morphology. Adsorption of Ni (II) by IRHC was examined. The influence of operating parameters, namely, pH, initial concentration and contact time on adsorption of Ni (II) by IRHC was evaluated. Batch adsorption tests showed that extent of Ni (II) adsorption depended on initial concentration, contact time and pH. Equilibrium adsorption was achieved in 120 min, while maximum Ni (II) adsorption occurred at pH 4. Langmuir and Freundlich isotherms were studied and the equilibrium adsorption data was ...
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Abstract Silica was prepared by burning rice husk in a muffle furnace at 500 C and immobilization (adsorption) of As (III) by the rice husk silica from aqueous solution was examined. Batch adsorption test showed that extent of As (III)... more
Abstract Silica was prepared by burning rice husk in a muffle furnace at 500 C and immobilization (adsorption) of As (III) by the rice husk silica from aqueous solution was examined. Batch adsorption test showed that extent of As (III) adsorption depended on ...
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A performance evaluation and modification of the UNICEF upward-flow water filter. VP Singh, M Chaudhuri Waterlines 12:22, 29-31, 1993. Providing safe drinking-water to the rural population of the South has been a challenging task. ...
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Water Res. Vol. 16. pp, I 113 to 1118, 1982 004~- 1354/82/071113-06503.00/0 Printed in Great Britain. All rights reserved Copyright ~ 1982 Pergamon Press Ltd REMOVAL OF INORGANIC MERCURY FROM WATER BY BITUMINOUS COAL MAHESH P. PANDEY* and... more
Water Res. Vol. 16. pp, I 113 to 1118, 1982 004~- 1354/82/071113-06503.00/0 Printed in Great Britain. All rights reserved Copyright ~ 1982 Pergamon Press Ltd REMOVAL OF INORGANIC MERCURY FROM WATER BY BITUMINOUS COAL MAHESH P. PANDEY* and MALAY ...
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A preliminary study was carried out to assess the usefulness of manganese as an aid in the lime clarification of municipal wastewater. The approach was intended to take advantage of the potential sorption ability of manganese oxides for... more
A preliminary study was carried out to assess the usefulness of manganese as an aid in the lime clarification of municipal wastewater. The approach was intended to take advantage of the potential sorption ability of manganese oxides for organic matter in the presence of divalent ...
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Four coal-based media, viz. alum-pretreated or ferric hydroxide-impregnated Giridih bituminous coal and lignite (alum-GBC, Fe GBC, alum-lignite and Fe Lignite) were laboratory tested to assess their potential in removing/inactivating... more
Four coal-based media, viz. alum-pretreated or ferric hydroxide-impregnated Giridih bituminous coal and lignite (alum-GBC, Fe GBC, alum-lignite and Fe Lignite) were laboratory tested to assess their potential in removing/inactivating enteric viruses in water. ...
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... RF Gould (Ed.), Am. Chem. Soc, Washington, DC Rai, D., et al. (1986) Geochemical Behavior of Chromium Species. In terim Report EPRI EA-4544, EPRI, Palo Alto, Calif. Richard, F. C, and Bourg, ACM (1991) Aqueous Geochemistry of... more
... RF Gould (Ed.), Am. Chem. Soc, Washington, DC Rai, D., et al. (1986) Geochemical Behavior of Chromium Species. In terim Report EPRI EA-4544, EPRI, Palo Alto, Calif. Richard, F. C, and Bourg, ACM (1991) Aqueous Geochemistry of Chromium: a Review. Water Res. ...
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Research Interests: Microbiology and Zinc
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The study examined AC/H2O2 treatment of amoxicillin and cloxacillin antibiotics aqueous solution. The treatment was optimized by the central composite design (CCD) of response surface methodology (RSM). The optimum operating conditions at... more
The study examined AC/H2O2 treatment of amoxicillin and cloxacillin antibiotics aqueous solution. The treatment was optimized by the central composite design (CCD) of response surface methodology (RSM). The optimum operating conditions at pH 3 were H2O2/COD ...
ABSTRACT In a laboratory study, iron and manganese amended activated alumina (IMAA) showed promise as an effective medium for removing arsenic [As(III) and As(V)] from groundwater. Batch adsorption/oxidation kinetic test indicated that... more
ABSTRACT In a laboratory study, iron and manganese amended activated alumina (IMAA) showed promise as an effective medium for removing arsenic [As(III) and As(V)] from groundwater. Batch adsorption/oxidation kinetic test indicated that the effectiveness of the IMAA medium was due to in situ oxidation of As(III) to As(V) and higher adsorption of As(V) by the medium. A home arsenic removal unit, containing 4 L of IMAA or AA and operated at 6 L/h, produced 2400 L and 2340 L or 1392 L and 1320 L of water in two cycles of runs when the influent arsenic concentration was 1.0 mg/L [0.6 mg/L of As(III) and 0.4 mg/L of As(V)]. The IMAA medium should be subjected to field trials to assess the long-term effects on performance, such as loss of medium capacity, attrition of the iron and manganese coating, fouling by organics, and pH and competing ion effects.
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The study examined the effect of operating conditions (zinc oxide concentration, pH and irradiation time) of the UV/ZnO photocatalytic process on degradation of amoxicillin, ampicillin and cloxacillin in aqueous solution. pH has a great... more
The study examined the effect of operating conditions (zinc oxide concentration, pH and irradiation time) of the UV/ZnO photocatalytic process on degradation of amoxicillin, ampicillin and cloxacillin in aqueous solution. pH has a great effect on amoxicillin, ampicillin and cloxacillin degradation. The optimum operating conditions for complete degradation of antibiotics in an aqueous solution containing 104, 105 and 103 mg/L amoxicillin, ampicillin and cloxacillin, respectively were: zinc oxide 0.5 g/L, irradiation time 180 min and pH 11. Under optimum operating conditions, complete degradation of amoxicillin, ampicillin and cloxacillin occurred and COD and DOC removal were 23.9 and 9.7%, respectively. The photocatalytic reactions under optimum conditions approximately followed a pseudo-first order kinetics with rate constant (k) 0.018, 0.015 and 0.029 min(-1) for amoxicillin, ampicillin and cloxacillin, respectively. UV/ZnO photocatalysis can be used for amoxicillin, ampicillin and cloxacillin degradation in aqueous solution.
Research Interests: Engineering, Water, Catalysis, Kinetics, Photochemistry, and 15 morePhotocatalysis, Ph, Hazardous Materials, Amoxicillin, Time Factors, Solutions, Operant Conditioning, Dissolved Organic Carbon, Chemical Oxygen Demand, Ampicillin, Aqueous Solution, DCO, Medical Waste, Ultraviolet Rays, and Rate Constant
Research Interests: Engineering, Photochemistry, Statistical Analysis, Water Purification, Wastewater Treatment, and 11 moreHazardous Materials, Iron, Hydrogen Peroxide, Anti-Bacterial Agents, Amoxicillin, Operant Conditioning, Bioreactors, Hydraulic Retention Time, Sequencing Batch Reactor, Hydrolysis, and Equipment Design
The study examined degradation of the antibiotics amoxicillin, ampicillin and cloxacillin in aqueous solution by the photo-Fenton process. The optimum operating conditions for treatment of an aqueous solution containing 104, 105 and 103... more
The study examined degradation of the antibiotics amoxicillin, ampicillin and cloxacillin in aqueous solution by the photo-Fenton process. The optimum operating conditions for treatment of an aqueous solution containing 104, 105 and 103 mg/L amoxicillin, ampicillin, and cloxacillin, respectively was observed to be H(2)O(2)/COD molar ratio 1.5, H(2)O(2)/Fe(2+) molar ratio 20 and pH 3. Under optimum operating conditions, complete degradation of amoxicillin, ampicillin and cloxacillin occurred in 2 min. Biodegradability (BOD(5)/COD ratio) improved from approximately 0 to 0.4, and COD and DOC degradation were 80.8 and 58.4%, respectively in 50 min. Photo-Fenton treatment resulted in the release and mineralization of organic carbon and nitrogen in the antibiotic molecule. Increase in ammonia and nitrate concentration, and DOC degradation were observed as a result of organic carbon and nitrogen mineralization. DOC degradation increased to 58.4% and ammonia increased from 8 to 13.5mg/L, and nitrate increased from 0.3 to 14.2mg/L in 50 min.
Research Interests: Engineering, Carbon, Ph, Hazardous Materials, Nitrogen, and 15 moreIron, Hydrogen Peroxide, Mineralization, Amoxicillin, Operant Conditioning, Dissolved Organic Carbon, Oxidation, Biodegradability, Organic carbon, Chemical Oxygen Demand, Ampicillin, Aqueous Solution, DCO, Nitrogen mineralization, and Photochemical Processes
Degradation of pesticides chlorpyrifos, cypermethrin and chlorothalonil in aqueous solution by TiO2 photocatalysis under UVA (365 nm) irradiation was examined. Enhancement of degradation and improvement in biodegradability index (BOD5/COD... more
Degradation of pesticides chlorpyrifos, cypermethrin and chlorothalonil in aqueous solution by TiO2 photocatalysis under UVA (365 nm) irradiation was examined. Enhancement of degradation and improvement in biodegradability index (BOD5/COD ratio) by H2O2 addition were also evaluated. UVA irradiation per se produced insignificant degradation of the pesticides. In UV/TiO2 photocatalysis (TiO2 1.5 g L(-1), pH 6 and 300 min irradiation), COD and TOC removal were 25.95 and 8.45%, respectively. In UV/TiO2/H2O2 photocatalysis (TiO2 1.5 g L(-1), H2O2 100 mg L(-1), pH 6 and 300 min irradiation), COD and TOC removal were 53.62 and 21.54%, respectively and biodegradability index improved to 0.26. Ammonia-nitrogen (NH3-N) decreased from 22 to 7.8 mg L(-1) and nitrate-nitrogen (NO3(-)-N) increased from 0.7 to 13.8 mg L(-1) in 300 min, indicating mineralization. Photocatalytic degradation followed pseudo-first order kinetics with rate constant (k) of 0.0025 and 0.0008 min(-1) for COD and TOC removal, respectively. FTIR spectra indicated degradation of the organic bonds of the pesticides. UV/TiO2/H2O2 photocatalysis is effective in degradation of pesticides chlorpyrifos, cypermethrin and chlorothalonil in aqueous solution. UV/TiO2/H2O2 photocatalysis may be applied as pretreatment of a chlorpyrifos, cypermethrin and chlorothalonil pesticide wastewater at pH 6, for biological treatment.