Abstract:Water samples were fractionated by PES UF membranes with molecular weight cutoffs (MWCOs) of 10、30kDa and PVDF UF membrane with MWCOs of 100kDa, and these permeates were filtrated by PVDF UF membrane with MWCOs of 150kDa and CA MF membrane with a 0.1μm pore size, as to investigate influence of nature organic matter (NOM) with different MWCOs on flux. The NOM larger than 30kDa accounting for 15% of total organic matter resulted in 86% of flux decline for MF and 54% for UF, respectively. It was shown that coagulation removed the NOM larger than 100kDa that result in over 40% of flux decline. As a result, in spite of removing 10% of NOM only, coagulation enhanced flux substantially. Powdered active carbon (PAC) removed NOM smaller than 30kDa that showed little contribution to flux decline. Therefore, PAC removed 76% of NOM but showed little contribution to enhance flux. It can be concluded that the effect of pretreatment on enhancing flux depended on contribution of NOM to flux decline rather than its amounts removed.
聂莉, 董秉直. 不同相对分子质量的有机物对膜通量的影响[J]. 中国环境科学, 2009, 29(10): 1086-1092.
NIE Li, DONG Bing-Zhi. Influence of different molecular weight of nature organic matter on membrane flux.. CHINA ENVIRONMENTAL SCIENCECE, 2009, 29(10): 1086-1092.