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Microbial behaviour in a membrane bioreactor with complete sludge retention

Paper ID Volume ID Publish Year Pages File Format Full-Text
36639 45139 2005 6 PDF Available
Title
Microbial behaviour in a membrane bioreactor with complete sludge retention
Abstract

Long-term microbial behaviour was investigated in a membrane bioreactor with complete sludge retention. The total organic carbon concentration in the supernatant slightly increased with time, as attributed to the accumulation of soluble microbial products, especially those macromolecules with molecular weight >100,000. Accumulation of inorganic components was also observed in the reactor, with MLVSS/MLSS decreasing from 88% to 81.8%. A pseudo-steady state was evident after 200 days of operation when the sludge concentration leveled off at around 16 kg-MLSS m−3. The corresponding F/M ratio was 0.1 kg COD kg (VSS d)−1 and the observed sludge yield Yb was below 0.11 kg VSS kg COD−1. Kinetic analysis revealed a theoretical sludge yield Y of 0.288 kg VSS kg COD−1 and a decay rate b of 0.023 d−1, respectively, 72% and 46% of the lower limits of those in a conventional activated sludge process. Microbial viability indicated by heterotrophic bacteria amount per MLVSS greatly decreased during the first 200 days, but organic removal performance always remained stable. Membrane permeability, however, decreased with the time owing to the change in the composition of the mixed liquor.

Keywords
Membrane bioreactor; Complete sludge retention; Microbial growth; Microbial product; Membrane fouling; Microbial viability
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 40, Issue 10, October 2005, Pages 3165–3170
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