膜科学与技术

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Investigation on membrane fouling of microalgae-fungus/bacteria consortia by parallel factor analysis method

Authors： FAN Hua , FANG Fan, LIU Qiang, XIN Jiaqi, SUN Shengjin, LI Kun

Units： School of Resources, Environmental & Chemical Engineering, Nanchang University, Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education

KeyWords： microalgae-bacteria symbiosis; membrane fouling; extracellular polymeric substance (EPS); digested swine manure wastewater

ClassificationCode：TQ 028.8

year,volume(issue):pagination： 2020,40(4):17-24

Abstract：

In this study, microalgae-fungus consortia and microalgae-bacteria consortia were utilized for the treatment of digested swine manure wastewater, and their influence on ultrafiltration membrane fouling was investigated using filtration cell with dead end filtration mode. Three kinds of mixture from different groups (A: pure microalgae system; B: microalgae-fungal system; C: microalgae-activated sludge system) were tested for membrane fouling conditions. The results showed that the flux decreasing rates of Group B and C were lower than that of Group A. he membrane fouling mechanism for Group A was dominated by standard blocking and cake filtration. However, the membrane fouling mechanisms for Group B and C had a high degree of fitting with standard blocking, intermediate blocking and cake filtration models. The mixture from Group A had a larger proportion in the particle size distribution of 1-30μm and less among the range of 30-1000μm in comparison with those of Group B and Group C, resulting in faster blocking of the membrane pores, looser cake layer and more serious membrane fouling for Group A. The analysis of EEMs coupled with PARAFAC modeling of desorbed solutions indicated that the organic pollutants on the membrane surface were mainly tryptophan, tyrosine proteins and polysaccharides. Both microalgae-fungus consortia and microalgae-bacteria consortia can form harmonious symbiotic relationship, which greatly reduced the EPS production, especially tryptophan proteins that contributes to the mitigation of membrane fouling.

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