期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 650, 期 -, 页码 1882-1888出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2018.09.321
关键词
Energy uncoupling; Bio-fouling; Sludge property; Filtration resistance; Fouling model; Extracellular polymeric substance (EPS)
资金
- National Natural Science Foundation of China [51608150]
- Natural Science Foundation of Harbin [2017RAQXJ206]
- Natural Science Foundation of Heilongjiang Province [E2017042]
- China Postdoctoral Found [2017M610210]
Energy uncoupling technology was applied to the membrane process to control the problem of bio-fouling. Different dosages of uncoupler (2,4 dinitrophenol, DNP) were added to the activated sludge, and a short-termultrafiltration test was systematically investigated for analyzing membrane fouling potential and underlying mechanisms. Ultrafiltration membrane was used and made of polyether-sulfone with a molecular weight cut off (MWCO) of 150 kDa. Results indicated that low DNP concentration (15-30 mg/g VSS) aggravated membrane fouling because more soluble microbial products were released and then rejected by the membrane, which significantly increased cake layer resistance compared with the control. Conversely, a high dosage of DNP (45 mg/g VSS) retarded membrane fouling owing to the high inhibition of extracellular polymeric substances (proteins and polysaccharides) of the sludge, which effectively prevented the formation of cake layer on the membrane surface. Furthermore, analyses of fouling model revealed that a high dosage of DNP delayed the fouling model from pore blocking transition to cake filtration, whereas this transition process was accelerated in the low dosage scenario. (c) 2018 Elsevier B.V. All rights reserved.
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