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Correlation between dissolved oxygen concentration, microbial community and membrane permeability in a membrane bioreactor

Paper ID Volume ID Publish Year Pages File Format Full-Text
36091 45120 2006 8 PDF Available
Title
Correlation between dissolved oxygen concentration, microbial community and membrane permeability in a membrane bioreactor
Abstract

The effect of dissolved oxygen (DO) level on microfiltration performance and microbial physiology was investigated in membrane-coupled sequencing batch reactors (MSBR). Two bioreactors employing anoxic/oxic (A/O) and only oxic (–O–) phase, respectively were run in parallel to elucidate how DO level does affect membrane filterability and microbial characteristics of sludge. If TMP is considered as an important parameter for the MSBR system the head loss originated from the water-level decline during the suction step should be taken into account. TMP value associated with the water-level reduction was calculated to 2.0 kPa, indicating it should not be ignored in this study. When the cycles in MSBR were repeated, the A/O phase resulted in faster rise in TMP, corresponding to greater membrane fouling, compared to the –O– phase. Permeate flux as well as airflow rate proved to be a major factor affecting the membrane performance for the A/O phase. Analyses of particle size distribution and specific cake resistance indicates that the flocs in the A/O phase, smaller than in the –O– phase, tend to form a dense and compact cake on the membrane surface and give rise to a higher hydraulic resistance. Irreversible membrane fouling also developed faster in the A/O than in the –O– reactor. Analyses of microbial community by FISH and DGGE showed a significant difference in microbial community between two reactors. However, no microbial community difference was found between suspended and attached microorganisms for the same reactor.

Keywords
Anoxic phase; EPS; FISH/DGGE; Floc stickiness; Membrane; MSBR
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Correlation between dissolved oxygen concentration, microbial community and membrane permeability in a membrane bioreactor
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 41, Issue 5, May 2006, Pages 1165–1172
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