Effect of Soluble Microbial Products Hydrophobicity on Membrane Fouling
Date Issued
2011
Date
2011
Author(s)
Kuo, Chin-Sheng
Abstract
Biological treatment systems with different sludge retention time (SRT), fixed carrier biological system (FCBS) and activated sludge process (ASP) were studied. Membrane permeate flux fluctuation was constantly monitored. The effect of soluble microbial products (SMP) hydrophobicity on membrane fouling was investigated with the use of DAX-8 resin to isolate hydrophilic and hydrophobic compounds in water samples, with total organic compound (TOC), carbohydrate and protein were taken as quantitative parameters for hydrophobicity analyze.
Two different membrane pore sizes (30 kDa and 100 kDa) were used in membrane operation. Fiber filter with pore size of 0.1 μm was applied as pretreatment in order to eliminate the impact of suspended solids in water samples on membrane fouling. Effluents from different biological treatment systems (FCBS and ASP) were run through membrane process and it was observed that FCBS effluents contained higher SMP concentrations and caused more significant membrane fouling than effluents from ASP system. The result also suggested that membrane fouling increase with SMP concentrations.
Greater permeate flux decline was observed in membrane process with larger pore size for both FCBS and ASP system. Hydrophobicity analysis indicated hydrophilic contents are the major components of SMP, and the result also indicated that membrane retained more hydrophilic contents than hydrophobic contents. In conclusion, it can be suggested membrane fouling was mainly affected by hydrophilic substances.
Subjects
SRT
FCBS
ASP
Membrane fouling
DAX-8 resin
SMP
Hydrophobicity
Type
thesis
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