Role of EPS in membrane fouling of a submerged anaerobic-anoxic-oxic (A-A-O) membrane bioreactor for municipal wastewater treatment

Zhiwei Wang State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai, 200092, P.R. China Phone: +86 (21) 65980400 Fax: +86 (21) 65980400

Zhichao Wu State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai, 200092, P.R. China Phone: +86 (21) 65980400 Fax: +86 (21) 65980400

Shujuan Tang State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai, 200092, P.R. China Phone: +86 (21) 65980400 Fax: +86 (21) 65980400

Shaofan Ye State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai, 200092, P.R. China Phone: +86 (21) 65980400 Fax: +86 (21) 65980400

Abstract

An anaerobic-anoxic-oxic membrane bioreactor for real municipal wastewater treatment was operated under various conditions in order to investigate extracellular polymeric substances (EPS) properties and their role in membrane fouling. Test results showed that EPS, proteins in EPS (EPS_p) and carbohydrates in EPS (EPS_c) had correlations with membrane fouling. EPS_p were found to have more significant correlations with membrane fouling while EPS and EPS_c had loose correlations with membrane fouling, indicating that EPS_p were an important factor in membrane fouling. Three-dimensional excitation-emission matrix fluorescence spectra analysis revealed that Peak C had potential correlations with the membrane fouling. Peak C, which was associated with fulvic acid-like substances, should be mainly originated from microbial metabolism. Gel filtration chromatograph (GFC) demonstrated that the EPS had narrower molecular weight (MW) distribution compared to the influent wastewater. It was also found that the number-average MW (M_n) and the weight-average MW (M_w) of EPS increased with the increase of operation time.

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Role of EPS in membrane fouling of a submerged anaerobic-anoxic-oxic (A-A-O) membrane bioreactor for municipal wastewater treatment

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Role of EPS in membrane fouling of a submerged anaerobic-anoxic-oxic (A-A-O) membrane bioreactor for municipal wastewater treatment

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