On the fouling mechanism of polysulfone ultrafiltration membrane in the treatment of coal gasification wastewater

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• 作者：Xue Zou ; Jin Li
• 关键词：membrane fouling ; ultrafiltration membrane ; coal gasification wastewater ; rejection coefficient
• 刊名：Frontiers of Chemical Science and Engineering
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：10
• 期：4
• 页码：490-498
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Industrial Chemistry/Chemical Engineering; Nanotechnology;
• 出版者：Higher Education Press
• ISSN：2095-0187
• 卷排序：10

文摘

Membrane fouling has been investigated by using a polysulfone ultrafiltration membrane with the molecular weight cutoff of 20 kDa to treat crushed coal pressurized gasification wastewater. Under the conditions of different feed pressures, the permeate flux declines and rejection coefficients of pollutants referring to three parameters (total organic carbon (TOC), chroma and turbidity) were studied. The membrane fouling mechanism was simulated with three classical membrane fouling models. The membrane image and pollutants were analyzed by scanning electron microscopy and gas chromatography-mass spectrography (GC-MS). The results indicate that the permeate flux decreases with volume reduction factor before reaching a constant value. The rejection coefficients were also measured: f_TOC = 70.5%, f_C = 84.9% and f_T = 91%. Further analysis shows that the higher the feed pressure is, the sooner the permeate flux reaches constant value and the more sharply the permeate flux declines. Constant flux indicates a nonlinear growth with feed pressure (P_F): when P_F equals 1.2 bar, the mark for the critical flux, slight membrane fouling occurs; when P_F exceeds 1.2 bar, cake layer pollution aggravates. Also the rejection coefficients of global pollutant increases slightly with P_F, suggesting the possibility of cake compression when P_F exceeds 1.2 bar. Through regression analysis, the fouling of polysulfone ultrafiltration membrane could be fitted very well by cake filtration model. The membrane pollutants were identified as phthalate esters and long-chain alkenes by GC-MS, and a certain amount of inorganic pollutants by X-ray photoelectron spectroscopy.Keywordsmembrane foulingultrafiltration membranecoal gasification wastewaterrejection coefficientReferences1.Li H Q, Han H J, Du M A, Wang W. Removal of phenols, thiocyanate and ammonium from coal gasification wastewater using moving bed biofilm reactor. 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