期刊
RSC ADVANCES
卷 6, 期 86, 页码 83456-83465出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra17376d
关键词
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资金
- National Natural Science Foundation of China [51208140]
- National Water Pollution Control and Treatment Science and Technology Major Project of China [2012ZX07201002]
To investigate the influence of different molecular weight distributions on UF membrane fouling, NOM in natural water was fractionated into five components: < 5 kDa, 5-10 kDa, 10-50 kDa, 50-100 kDa, and 100 kDa-0.45 mu m, based on their size and potential to develop irreversible membrane fouling (IF). Reversible membrane fouling (RF) was conducted by unstirred cell test. The size fractionation combined with PARAFAC of three-dimensional fluorescence excitation-emission matrix (EEM) of fractions was performed to identify the substances responsible for IF and RF. Moreover, a mass balance analysis coupled with a correlation analysis was performed to acquire information on the organic matter fouling behavior. Based on the fouling effect, a scanning electron microscope (SEM) was used for mechanism analysis. In the five fractions, the 100 kDa-0.45 mu m fraction, which only accounted for 7.2% DOC and in which protein-like substances recognized by EEM-PARAFAC existed, contributed the most to the membrane flux decline caused by both IF and RF. The < 5 kDa fraction, which accounted for 70% DOC and mainly contained humic-like substances and protein-like substances, caused little flux decline, but the contribution was irreversible. Mechanism analysis made it clear that the small molecular substances (< 5 kDa, 5-10 kDa) caused irreversible flux decline of the membrane through pore blocking, and large organic molecules (50-100 kDa, 100 kDa-0.45 mu m) contributed to irreversible and reversible membrane fouling through pore blocking and cake layer forming. It is important to consider the contribution of < 5 kDa and 100 kDa-0.45 mu m in the choice of pretreatment technologies to control membrane fouling.
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