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Membrane fouling during the ultrafiltration process for pesticide wastewater treatment

Authors： ZENG Kailiang 1, WANG Zhaohui 1,2, CUI Zhaoliang 1,2,*, WANG Xiaozu 1,LIU Fei 1, PENG Wenbo 2

Units： 1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering,Nanjing Tech University,Nanjing 210009,China; 2. JiangsuJiuwu Hi-Tech Co.,Ltd,Nanjing 211808,China;

KeyWords： pesticide wastewater; ultrafiltration; critical flux; membrane fouling

ClassificationCode：TQ028

year,volume(issue):pagination： 2018,38(2):98-105

Abstract：

Nanofiltration is used in pesticide wastewater treatment to remove the low-molecule organic matters following advanced oxidation. It is necessary to pretreat the wastewater before nanofiltration by coagulation-ultrafiltration (UF) process to meet the feed requirement of nanofiltration membrane system. The effects of coagulant type and dosage were investigated, and the anti-fouling performance and the critical operation condition of the three kinds of ultrafiltration membranes under different pressures were studied. The optimized concentrations of polyaluminium chloride (PAC),ferric chloride (FeCl3·6H2O) and polyacrylamide (PAM)were800 mg/L, 500 mg/L, and 10 mg/L, respectively; under which conditions, the removal rates of CODCr, total phosphorus, turbidity, chromaticity by the hybrid process were 58.0-59.1%, 88.8%-89.7%, 99.8-99.9%, 84%, respectively. PVDF UF membrane with mean pore size of 20 nm exhibited higher critical flux and permeability compared with the membranes with pore size of 11 nm and 40 nm. Membrane fouling induced the reduction of membrane pore size, and a higher permeate flux can be obtained by optimizing the membrane pore size to reduce membrane fouling.

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AuthorIntro：

第一作者简介：姓名（1992-），男，湖南株洲人，硕士，主要研究方向为高分子膜的制备和膜污染。通讯作者，E-mail：zcui@njtech.edu.cn

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