Chemical cleaning of fouled PVC membrane during ultrafiltration of algal-rich water  

作　　者：Yan Zhang Jiayu Tian Heng Liang Jun Nan Zhonglin Chen Guibai Li 

机构地区：[1]State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.

出　　处：《Journal of Environmental Sciences》2011年第4期529-536,共8页环境科学学报（英文版）

基　　金：supported by the Important Special Program of Science and Technology for the Control and Treatment of Water Pollution in China(No.2008ZX07422-005);the National Science and Technology Project of Eleventh Five Years(No.2006BAJ08B05-2);the National Creative Research Groups Foundation of China(No.50821002);the State Key Laboratory of Urban Water Resource and Environment(No.2008DX04);the National Postdoctoral Science Foundation of China(No.20100471062)

摘　　要：Cleaning of hollow-fibre polyvinyl chloride （PVC） membrane with different chemical reagents after ultrafiltration of algal-rich water was investigated. Among the tested cleaning reagents （NaOH, HCl, EDTA, and NaClO）, 100 mg/L NaClO exhibited the best performance （88.4% ± 1.1%） in removing the irreversible fouling resistance. This might be attributed to the fact that NaClO could eliminate almost all the major foulants such as carbohydrate-like and protein-like materials on the membrane surface, as confirmed by Fourier transform infrared spectroscopy analysis. However, negligible irreversible resistance （1.5% ± 1.0%） was obtained when the membrane was cleaning by 500 mg/L NaOH for 1.0 hr, although the NaOH solution could also desorb a portion of the major foulants from the fouled PVC membrane. Scanning electronic microscopy and atomic force microscopy analyses demonstrated that 500 mg/L NaOH could change the structure of the residual foulants on the membrane, making them more tightly attached to the membrane surface. This phenomenon might be responsible for the negligible membrane permeability restoration after NaOH cleaning. On the other hand, the microscopic analyses reflected that NaClO could effectively remove the foulants accumulated on the membrane surface.Cleaning of hollow-fibre polyvinyl chloride （PVC） membrane with different chemical reagents after ultrafiltration of algal-rich water was investigated. Among the tested cleaning reagents （NaOH, HCl, EDTA, and NaClO）, 100 mg/L NaClO exhibited the best performance （88.4% ± 1.1%） in removing the irreversible fouling resistance. This might be attributed to the fact that NaClO could eliminate almost all the major foulants such as carbohydrate-like and protein-like materials on the membrane surface, as confirmed by Fourier transform infrared spectroscopy analysis. However, negligible irreversible resistance （1.5% ± 1.0%） was obtained when the membrane was cleaning by 500 mg/L NaOH for 1.0 hr, although the NaOH solution could also desorb a portion of the major foulants from the fouled PVC membrane. Scanning electronic microscopy and atomic force microscopy analyses demonstrated that 500 mg/L NaOH could change the structure of the residual foulants on the membrane, making them more tightly attached to the membrane surface. This phenomenon might be responsible for the negligible membrane permeability restoration after NaOH cleaning. On the other hand, the microscopic analyses reflected that NaClO could effectively remove the foulants accumulated on the membrane surface.

关 键 词：membrane fouling chemical cleaning algal-rich water NAOH NACLO 

分 类 号：TQ028.8[化学工程] TS201.23[轻工技术与工程—食品科学]