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Mechanistic study of on-site sludge reduction in a baffled bioreactor consisting of three series of alternating aerobic and anaerobic compartments

Paper ID Volume ID Publish Year Pages File Format Full-Text
3502 173 2012 7 PDF Available
Title
Mechanistic study of on-site sludge reduction in a baffled bioreactor consisting of three series of alternating aerobic and anaerobic compartments
Abstract

A baffled reactor with repeated coupling of aerobic and anaerobic conditions (rCAA) was constructed and the mechanism of the on-site sludge reduction was analyzed systematically. During the long-term operation of 3 years, the chemical oxygen demand (COD) removal efficiency reached over 90% on average and the sludge yield in the rCAA system was 0.098 kg suspended sludge (SS) kg−1 COD, which was approximately 36.3% of that in a conventional activated sludge process at an influent COD of 700–800 mg L−1 and hydraulic retention time (HRT) of 15 h. Analysis of soluble components, sludge characteristics, microorganism community and metabolic activities in the rCAA system showed that, when the sludge in the aerobic zone flowed into the anaerobic zone, sludge destruction and degradation occurred. Intracellular organic substances were then released and further hydrolyzed to small molecular compounds. These intermediate substances were degraded in subsequent aerobic compartments. In this way, cryptic growth of the sludge was realized that could contribute to sludge reduction. Microbial ecological analysis by denaturing gradient gel electrophoresis (DGGE) further showed that the rCAA process spatially domesticated the different microbial communities along the flow direction of the bioreactor, which enhanced excess sludge lysis and transformation, cryptic growth and bacterial predation.

► A bioreactor repeated coupling of aerobic and anaerobic (rCAA) was constructed. ► Sludge on-site minimization in the rCAA was realized in long time running process. ► Mechanism of sludge reduction was systematically elucidated by multi-approaches. ► Microbial community along the flow direction in rCAA was spatially diversified.

Keywords
On-site sludge reduction; Baffled bioreactor; Aerobic processes; Anaerobic processes; Waste-water treatment; Environmental preservation
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Mechanistic study of on-site sludge reduction in a baffled bioreactor consisting of three series of alternating aerobic and anaerobic compartments
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 67, 15 August 2012, Pages 45–51
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