期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 156, 期 -, 页码 512-521出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2015.10.044
关键词
Seawater; Ultrafiltration; Fouling membrane; Alginic acids; Humic acids
The present work investigates the fouling mechanisms of PVDF hollow fiber membrane (0.03 mu m) during the dead end ultrafiltration at a fixed permeate flux (outside to inside configuration) of complex synthetic seawater composed by humic acids, alginic acids, inorganic particles and numerous salts at high concentrations. Short term ultrafiltration experiments at 100 L h(-1) m(-2) show that the optimal specific filtered volume seems to be equal to 50 L m(-2). A residual fouling resistance equal to 2 . 10(10) m(-1) is added after each cycle of filtration during 8 h of ultrafiltration at 100 L h(-1) m(-2) and 50 L m(-2). Most of the fouling is reversible (80%). Organics are barely (15% of humic acids) retained by the membrane. Backwash efficiency drops during operation which induces less organics into backwash waters. Humic acids could preferentially accumulate on the membrane early in the ultrafiltration and alginic acids after the build-up of a fouling pre-layer. Colloids and particulates could accumulate inside a heterogeneous fouling layer and/or the concentrate compartment of the membrane module before being more largely recovered inside backwash waters. (C) 2015 Elsevier B.V. All rights reserved.
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