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Development of an ecologically sustainable wastewater treatment system

The present study aimed mainly for the development of a wastewater treatment system incorporating enhanced primary treatment, anaerobic digestion of coagulated organics, biofilm aerobic process for the removal of soluble organics and disinfection of treated water. An attempt was also made to study t...

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Published in:Water science and technology 2008-01, Vol.58 (1), p.7-12
Main Authors: Kumar, Lokendra, Ranjan, Rajiv, Sabumon, P.C
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description The present study aimed mainly for the development of a wastewater treatment system incorporating enhanced primary treatment, anaerobic digestion of coagulated organics, biofilm aerobic process for the removal of soluble organics and disinfection of treated water. An attempt was also made to study the reuse potential of treated water for irrigation and use of digested sludge as soil conditioner by growing marigold plants. Ferric chloride dose of 30 mg/l was found to be the optimum dose for enhanced primary treatment with removals of COD and BOD to the extent of 60% and 77%, respectively. Efficient anaerobic digestion of ferric coagulated sludge was performed at 7 days hydraulic retention time (HRT). Upflow aerobic fixed film reactor (UAFFR) was very efficient in removals of COD/BOD in the organic loading rate (OLR) range of 0.25 to 3 kg COD/m(3)/day with COD and BOD removals in the range 65-90 and 82-96, respectively. Photo-oxidation followed by disinfection saved 50% of chlorine dose required for disinfection of treated effluent and treated water was found to be suitable for irrigation. The result also indicated that anaerobically digested sludge may be an excellent soil conditioner. From the results of this study, it is possible to conclude that the developed wastewater treatment system is an attractive ecologically sustainable alternative for sewage treatment from institutional/industrial/residential campuses.
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identifier ISSN: 0273-1223
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subjects Aerobiosis
Anaerobic conditions
Anaerobic digestion
Anaerobic processes
Anaerobic treatment
biochemical oxygen demand
biofilm
Biofilms
Bioreactors
Chemical oxygen demand
Chlorine
Digestion
Disinfection
Disinfection - instrumentation
Disinfection - methods
dose response
Ecological monitoring
Ecosystem
Effluent treatment
equipment design
equipment performance
Ferric chloride
Hydraulic retention time
Industrial Waste
Irrigation
Irrigation water
Kinetics
Load distribution
Loading rate
Organic loading
Oxidation
Oxidation-Reduction
photochemical reactions
Photochemistry
Photooxidation
Plants (botany)
Removal
Retention time
Sewage
Sewage treatment
Sewage treatment plants
Sludge
Sludge digestion
Soil
soil amendments
Soil conditioners
Soil conditions
Sustainability
Sustainable development
Treated water
Waste Disposal, Fluid - instrumentation
Waste Disposal, Fluid - methods
Waste Disposal, Fluid - standards
waste utilization
Wastewater
wastewater irrigation
Wastewater treatment
Water Purification - instrumentation
Water Purification - methods
Water Purification - standards
water reuse
title Development of an ecologically sustainable wastewater treatment system
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