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Removal mechanisms of volatile organic compounds (VOCs) from effluent of common effluent treatment plant (CETP)

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Title Removal mechanisms of volatile organic compounds (VOCs) from
effluent of common effluent treatment plant (CETP)
 
Creator Padalkar, Ashwini V.
Kumar, Rakesh
 
Subject Environmental Management
Water Treatment
 
Description This study investigated the occurrence, removal and influence of plant-operating conditions on removal
mechanisms of 83 VOCs in different treatment units of a CETP in Mumbai, treating industrial waste on
primary and secondary level. A mass balance approach was used to predict VOC removal by volatilization,
stripping, weir drop, adsorption, and biodegradation. Results indicate that ~17% of VOCs were
removed by stripping in equalization tank and ~8% were removed by weir drop in primary clariflocculator
respectively. Biodegradation was the dominant mechanism in aeration tank and was relatively
poor for hydrophobic compounds which were more vulnerable to removal by stripping. Stripping
rates could be reduced by increasing the active biomass concentration and using fine pore diffusers to
reduce the air/effluent ratio. Decrease in Henry's constant and compound concentration can shift the
main removal mechanism from stripping to biodegradation. Results also show considerable agreement
between measured (71.2%) and predicted (67.1%) total removal, especially in aeration tanks. Equalization
tanks (actual, 20.5%, predicted, 16.9%), primary clari-flocculator (actual, 14.2%, predicted, 7.7%), and
secondary clarifier units (actual, 29.5%, predicted, 16.8%) showed fairly acceptable differences in
measured and predicted removal. The effect of other mechanisms on VOC removal need to be further
explored owing to their major contribution to VOC removal. This study is the first attempt in understanding
the mechanisms behind the removal of VOCs in each treatment unit, especially equalization
tanks and clarifier units, which have been severely underestimated till date.
 
Publisher Elsevier
 
Date 2018
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://neeri.csircentral.net/1210/1/SD.3.1.18.pdf
Padalkar, Ashwini V. and Kumar, Rakesh (2018) Removal mechanisms of volatile organic compounds (VOCs) from effluent of common effluent treatment plant (CETP). Chemosphere, 199. pp. 569-584. ISSN 0045-6535, ESSN: 1879-1298
 
Relation https://www.journals.elsevier.com/chemosphere/
http://neeri.csircentral.net/1210/