生物炭添加对缓解膜生物污染的影响

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Abstract In order to study the mitigation effect of biochar on membrane biofouling, Escherichia coli was selected as the model microorganism, and the effects of static adsorption, antibiofouling experiments and biochar on microorganisms and the extracellular polymers substances (EPS) released by microorganisms was analyzed,combined with the effect of biochar addition on membrane properties. The results showed that compared with the control group,the addition of biochar mainly alleviates the adhesion of microorganisms on the membrane surface by increasing the electrostatic repulsion between foulant and the membrane surface, increasing the hydrophilicity and roughness of the membrane surface, the number of bacteria on the membrane surface decreased by nearly 30% after adding biochar. In addition, in the antibiofouling experiment, the time to effectively delay the flux decay (6.5h) after adding biochar, the flux of dosing biochar at the end of filtration was 3.7times that of the control group, and to further alleviate the membrane pollution by absorbing microorganisms and extracellular polymeric substances. The adsorption capacity of biochar for Escherichia coli, protein-like and polysaccharide-like was 2.4x10⁵CFU/mL/g、3.729mg/g、1.135mg/g respectively, among which the effect on protein was more remarkable.

Key words： biochar biofouling Escherichia coli microfiltration adsorption

Received: 16 December 2022

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X703

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	XIA Si-lian
	YANG Xiao-huan
	HAO Li-tu
	CHEN Rong

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XIA Si-lian,YANG Xiao-huan,HAO Li-tu等. The efficiency and mechanism of biochar addition to mitigate membrane biofouling[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(7): 3518-3525.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I7/3518

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