Article: Membrane fouling mitigation by activated carbon addition in activated sludge filtration Journal: International Journal of Environmental Technology and Management (IJETM) 2014 Vol.17 No.6 pp.459 - 468 Abstract: Activated carbon (AC) was added into the activated sludge to alleviate membrane fouling during sludge microfiltration. The fouling mitigation profiles were evaluated at different AC sizes and doses by a single-fibre microfiltration system. It was found that the granular AC added in the sludge suspension can absorb the organic substances in the sludge in a certain level, including biopolymer clusters (BPC). There are three impacts from AC addition, including the positive effect by mechanically scouring the membrane surface, the positive effect by adsorb organic substances, and the negative impact of breaking up sludge flocs to release the organic matter. The whole effect of AC addition on membrane fouling has to depend on the relative intensity of these three effects. The suitable AC should have a smaller mean size below 200 µm, by which the membrane fouling mitigation efficiency was positively correlated with AC doses. Inderscience Publishers - linking academia, business and industry through research

Title: Membrane fouling mitigation by activated carbon addition in activated sludge filtration

Authors: Fei-Yun Sun; Wen-Yi Dong; Ji Li

Addresses: Shenzhen Key Laboratory of Water Resource Application and Environmental Pollution Control, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518055, China ' Shenzhen Key Laboratory of Water Resource Application and Environmental Pollution Control, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518055, China ' Shenzhen Key Laboratory of Water Resource Application and Environmental Pollution Control, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518055, China

Abstract: Activated carbon (AC) was added into the activated sludge to alleviate membrane fouling during sludge microfiltration. The fouling mitigation profiles were evaluated at different AC sizes and doses by a single-fibre microfiltration system. It was found that the granular AC added in the sludge suspension can absorb the organic substances in the sludge in a certain level, including biopolymer clusters (BPC). There are three impacts from AC addition, including the positive effect by mechanically scouring the membrane surface, the positive effect by adsorb organic substances, and the negative impact of breaking up sludge flocs to release the organic matter. The whole effect of AC addition on membrane fouling has to depend on the relative intensity of these three effects. The suitable AC should have a smaller mean size below 200 µm, by which the membrane fouling mitigation efficiency was positively correlated with AC doses.

Keywords: activated carbon adsorption; biopolymer clusters; BPC; membrane fouling mitigation; activated sludge filtration; single-fibre microfiltration.

DOI: 10.1504/IJETM.2014.066515

International Journal of Environmental Technology and Management, 2014 Vol.17 No.6, pp.459 - 468

Accepted: 06 Feb 2014
Published online: 14 Jan 2015 *

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Title: Membrane fouling mitigation by activated carbon addition in activated sludge filtration

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