文献类型：期刊文献

英文题名：Analysis of membrane fouling by proteins during nanofiltration of chitin alkali wastewater

作者：Li, Juan[1];Zhao, Liming[1];Wang, Yaosong[1];Chen, Chaoqin[1];Zhou, Jiachun[1];Qiu, Yongjun[1];Du, Hailong[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Bioreactor Engn, R&D Ctr Separat & Extract Technol Fermentat Ind, Shanghai 200237, Peoples R China

年份：2014

卷号：4

期号：4

起止页码：253

外文期刊名：JOURNAL OF WATER REUSE AND DESALINATION

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000348593400003)】；

基金：This work was financially supported by the National Natural Science Foundation of China (grant no. 31101381) and also by the Fundamental Research Funds for the Central Universities (NO. WF1214060).

语种：英文

外文关键词：chitin alkali effluent; hydrophobic; protein fouling; nanofiltration

摘要：The membrane fouling mechanism used during the nanofiltration (NF) of chitin alkali effluent was investigated. Tests were carried out in three large-scale chitin-processing plants with three kinds of wastewater. An alkali resistant NF membrane with molecular weight cut-off of 250 Da was employed. The reflection coefficient (sigma) and diffusion coefficient (P-s) of total proteins were deduced, assuming that the proteins were single entities in the feed. Viscosity and osmosis pressure were measured to evaluate their influences on the permeate flux. Furthermore, the fraction of the protein fouling was extracted and qualitatively analyzed by mass spectrometry. Results showed that the NF permeate flux of alkali wastewater with the highest protein concentration (4.00%) was the lowest, and that s and penetration P-s decreased with protein content growth. Over 60% of the peptides in the permeate were hydrophobic, whereas 70% of the peptides in the adsorption cake were hydrophilic. Irreversible resistance was the predominant resistance during NF processing, and the fouling behaviour of hydrophilic fractions was dominant.