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Membrane fouling properties under different filtration modes in a submerged membrane bioreactor

Paper ID Volume ID Publish Year Pages File Format Full-Text
35515 45093 2010 8 PDF Available
Title
Membrane fouling properties under different filtration modes in a submerged membrane bioreactor
Abstract

Four flat-sheet membrane modules, which were operated under four different filtration modes but with the same treatment capacity, were used to treat synthetic wastewater in a submerged membrane bioreactor (MBR). Particle size distribution (PSD), gel filtration chromatography (GFC), capillary suction time (CST), and three-dimensional excitation–emission matrix (EEM) fluorescence spectroscopy were used to characterize membrane fouling properties. The high instantaneous flux induced faster fouling rate and continuous filtration mode was the most applicable filtration mode in this study. The average particle size of all foulants was smaller than that of bulk sludge; and the higher the instantaneous flux was adopted, the larger the average particle size of foulants would be. Only macromolecule substances were detected in all the foulants. The macromolecule substances in the influent were degraded by microorganism and retained by membrane, and small molecular substances could pass through membrane pores to enter the effluent. The membrane foulants had poorer dewaterability compared to the mixed liquor confirmed by CST measurement. Although there were several peaks associated with protein-like fluorophores, fulvic acid-like substances and humic acid-like organics in soluble microbial products (SMP) and extracellular polymeric substances (EPS) sample, it was found that the dominant fluorescence substances in membrane foulants were protein-like substances.

Keywords
Filtration mode; Membrane foulants; Membrane fouling; Submerged membrane bioreactor; Wastewater treatment
First Page Preview
Membrane fouling properties under different filtration modes in a submerged membrane bioreactor
Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 45, Issue 10, October 2010, Pages 1699–1706
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering