Membrane biofouling by extracellular polymeric substances or soluble microbial products from membrane bioreactor sludge

This study extracted the soluble microbial products and loosely bound and tightly bound extracellular polymeric substances (EPS) from suspended sludge from a membrane bioreactor, original and aerobically/anaerobically digested, and compared their fouling potentials on a microfiltration membrane. The...

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Bibliographic Details
Published in:Applied microbiology and biotechnology 2007-03, Vol.74 (3), p.699-707
Main Authors: Ramesh, A, Lee, D. J, Lai, J. Y
Format: Article
Language:English
Subjects:
Aerobiosis
Anaerobiosis
Biofouling
Biological and medical sciences
Biopolymers - metabolism
Bioreactors
Biotechnology
EPS
Equipment Failure Analysis
Filtration
Filtration - instrumentation
Fundamental and applied biological sciences. Psychology
MBR
Membranes
Micropore Filters
Saccharides
Sewage - chemistry
Sludge
Sludge digestion
SMP
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Summary:This study extracted the soluble microbial products and loosely bound and tightly bound extracellular polymeric substances (EPS) from suspended sludge from a membrane bioreactor, original and aerobically/anaerobically digested, and compared their fouling potentials on a microfiltration membrane. The resistance of cake layer accounts for 95-98% of the total filtration resistances when filtering the whole sludges, with anaerobically digested sludge presenting the highest resistance among the three tested sludges. The tightly bound EPS has the highest potential to foul the membrane; however, the loosely bound EPS contribute most of the filtration resistances of the whole sludges. The foulants corresponding to the irreversible fouling have chemical fingerprints similar to those from loosely bound EPS, which have a greater predilection to proteins and humic substances than to polysaccharides.
ISSN:0175-7598
1432-0614
DOI:10.1007/s00253-006-0706-x