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

Content Provider	Springer Nature Link
Author	Zou, Xue Li, Jin
Copyright Year	2016
Abstract	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.
Starting Page	490
Ending Page	498
Page Count	9
File Format	PDF
ISSN	20950179
Journal	Frontiers of Chemical Engineering in China
Volume Number	10
Issue Number	4
e-ISSN	20950187
Language	English
Publisher	Higher Education Press
Publisher Date	2016-12-23
Publisher Institution	Chinese Universities
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	membrane fouling ultrafiltration membrane coal gasification wastewater rejection coefficient Industrial Chemistry/Chemical Engineering Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Chemical Engineering

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