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Biological decomposition of herbicides (EPTC) by activated sludge in a slurry bioreactor

Paper ID Volume ID Publish Year Pages File Format Full-Text
36084 45120 2006 5 PDF Available
Title
Biological decomposition of herbicides (EPTC) by activated sludge in a slurry bioreactor
Abstract

Biological treatment of hazardous chemical substances emitted into the environment has been expected to be a desirable treatment method. In this study the biodegradation of an herbicide, S-ethyl dipropylthiocarbamate (EPTC), has been investigated in an airlift bioreactor in batch experiments using waste activated sludge, freely suspended and immobilized, under aerobic conditions. The influence of activated sludge loadings (MLSS = 2000–9000 ppm), EPTC concentrations (So = 2–11 ppm) and aeration rates (Qg = 0.4–3.5 l min−1) on the degradation rate was discussed. The results show that for a constant activated sludge concentration of 4162 ppm, the biological degradation rate of EPTC increased with increasing aeration rate up to 2.5 l min−1. Although the increase of activated sludge concentration enhanced the biological degradation rate, the higher aeration rate was required to suspend activated sludge uniformly through the reactor and supply enough oxygen to the activated sludge. The maximum biodegradation rate was 0.16 h−1 at an activated sludge loading of 6000 ppm and aeration rate of 3.5 l min−1. Also, it was observed that the biodegradation rates for immobilized activated sludge were higher than those for freely suspended activated sludge. Finally a mathematical model was proposed to describe the biodegradation of EPTC in the bioreactor.

Keywords
Biodegradation; Herbicide; Waste activated sludge; Airlift bioreactor; Immobilization
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Biological decomposition of herbicides (EPTC) by activated sludge in a slurry bioreactor
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 41, Issue 5, May 2006, Pages 1124–1128
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us