期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 814, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2021.152569
关键词
Microbial fuel cell; Membrane fouling; Aeration rate; Micro-electric field; Sludge parameters
资金
- National Natural Science Foundation of China [21806147, 41977141]
- Natural Science Foundation of Shanxi Province [201801D121268]
- Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi (STIP) [2019L0562]
The addition of a micro-electric field has a synergistic effect with aeration in reducing membrane fouling and COD by reducing fouling attachment, improving sludge flocculation, and decreasing the content of extracellular polymeric substances.
Two membrane bioreactors with and without adding an electric circuit (named as MFC-MBR and C-MBR, respectively) were established to investigate the effects of micro-electric field on membrane fouling. With the aeration rate of 1.5 L/ min, the synergistic effect of aeration and micro-electric field was the best in reducing membrane fouling and COD in treatment of a simulated phenol wastewater. Compared with C-MBR, the running time of MFC-MBR was extended for 16 days. Scanning electron microscope (SEM) and energy-dispersive X-ray detector (SEM-EDX) demonstrated that less foulants were attached to the membrane and the attachment was loosend in MFC-MBR. The decreased absolute value of zeta potential indicated repulsion among the negatively-charged sludge particles was reduced and flocculation of the sludge was improved, which alleviated the membrane fouling. The soluble microbial products (SMP) and loosely-bound extracellular polymeric substances (LB-EPS) were also decreased in MFC-MBR. It was found that migration and neutralization of the negatively-charged particles, and degradation of microorganisms contributed to the alleviation of membrane fouling. Moreover, the decreases of carbohydrates in LB-EPS led to higher protein/ carbohydrates (PN/PS) ratio, which was a key parameter for alleviating membrane fouling. Meanwhile, the increase of tightly bound extracellular polymeric substances (TB-EPS) could also slow down membrane fouling. Because TBEPS can be used as a binder to strengthen the flocculation of sludge particles.
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