Precoating membranes with submicron super-fine powdered activated carbon after coagulation prevents transmembrane pressure rise: Straining and high adsorption capacity effects

WATER RESEARCH

卷:177

Article

Zhao, Yuanjun¹  Kitajima, Ryosuke¹  Shirasaki, Nobutaka²  Matsui, Yoshihiko²  Matsushita, Taku² 

[1] Hokkaido Univ, Grad Sch Engn, N13W8, Sapporo, Hokkaido 0608628, Japan

[2] Hokkaido Univ, Fac Engn, N13W8, Sapporo, Hokkaido 0608628, Japan

关键词: SSPAC;    SPAC;    Membrane fouling;    TMP;    Filtration;   

DOI  :  10.1016/j.watres.2020.115757

来源: Elsevier

【 摘 要 】

Commercially available powdered activated carbon (PAC) with a median diameter of 12-42 mu m was ground into 1 mu m sized superfine PAC (SPAC) and 200 nm sized submicron SPAC (SSPAC) and investigated as a pretreatment material for the prevention of hydraulically irreversible membrane fouling during a submerged microfiltration (MF) process. Compared with PAC and SPAC, SSPAC has a high capacity for selective biopolymer adsorption, which is a characteristic found in natural organic matter and is commonly considered to be a major contributor to membrane fouling. Precoating the membrane surface with SSPAC during batch filtration further removes the biopolymers by straining them out. In lab-scale membrane filtration experiments, an increase in the transmembrane pressure (TMP) was almost completely prevented through a precoating with SSPAC based on its pulse dose after coagulation pretreatment. The precoated SSPAC formed a dense layer on the membrane preventing biopolymers from attaching to the membrane. Coagulation pretreatment enabled the precoated activated carbon to be rinsed off during hydraulic backwashing. The functionality of the membrane was thereby retained for a long-term operation. Precoating the membranes with SSPAC after coagulation is a promising way to control membrane fouling, and efficiently prevents an increase in the TMP because of the straining effect of the SSPAC and the high capacity of the SSPAC to adsorb any existing biopolymers. (C) 2020 Elsevier Ltd. All rights reserved.

【 授权许可】

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