Influence of internal biofilm growth on residual permeability loss in aerobic granular membrane bioreactors

Environmental Science & Technology
Yu-Chuan JuangJuin-Yih Lai

Abstract

Membrane fouling results in flux decline or transmembrane pressure drop increase during membrane bioreactor (MBR) operation. Physical and chemical cleanings are essential to keep an MBR operating at an appropriate membrane flux. Considerable residual membrane permeability loss that cannot be removed by conventional cleaning requires membrane replacement. This study demonstrates that an internal biofilm can develop inside a hollow-fiber membrane and can probably account for up to 58.9 and 81.3% of total membrane resistance for aerobic granular MBR operated in sequencing batch reactor (SBR) mode or continuous-fed mode, respectively. The Arthrobacter sp. (accession no. AM900505 in GenBank) corresponded to internal biofilm development by polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) analysis and the agar-plating technique. This study also identifies a single strain, Arthrobacter sp., generates the internal biofilm. The Arthrobacter sp. is a rod-shaped bacterium with a size close to that of membrane pores, and can secrete excess bound proteins, hence can penetrate and attach itself inside the membrane and grow. Internal biofilm growth could contribute significantly to membrane resistance during long-te...Continue Reading

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Citations

Mar 23, 2010·Applied Microbiology and Biotechnology·Yu-Chuan JuangDuu-Jong Lee
Jun 15, 2014·Applied Microbiology and Biotechnology·Chunli WanXiang Liu
Nov 16, 2010·Chemosphere·Zhiping WangTong Zhang
Sep 5, 2015·Bioresource Technology·Chun-Hong ChenDa-Wen Gao
Feb 6, 2018·Critical Reviews in Biotechnology·Raquel LiébanaBritt-Marie Wilén
Mar 1, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Shengnan XuZhiqiang Hu
Dec 8, 2015·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Wei ChenBoris Mizaikoff
Aug 11, 2017·Environmental Science & Technology·Wei ChenHan-Qing Yu

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