Application of cross-flow microfiltration with rapid backpulsing to wastewater treatment

被引:33
作者
Ramirez, JA [1 ]
Davis, RH [1 ]
机构
[1] Univ Colorado, Dept Chem Engn, Boulder, CO 80309 USA
关键词
crossflow microfiltration; membranes; backpulsing; wastewater;
D O I
10.1016/S0304-3894(98)00204-0
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Cross-flow microfiltration with rapid backpulsing was investigated for the removal of suspended solids and dispersed oil from an aqueous stream. Laboratory experiments performed on clay suspensions demonstrate that rapid backpulsing can maintain the permeate flux at a level which is more than 10-fold over the long-term flux in the absence of backpulsing, without any reduction in the permeate quality. Experiments with dilute oil-in-water dispersions show that rapid backpulsing can increase the permeate flux by up to 25 times; however, the enhanced performance in this case cannot be maintained over the life of the membrane and is highly dependent on the degree of membrane use. An economic analysis shows that cross-flow microfiltration without backpulsing is not economically feasible when compared to conventional treatment methods, but that operation with backpulsing at the enhanced permeate flux levels observed for the clay experiments will result in lower costs of treated water than for conventional methods, for facilities with capacities of up to 6000 m(3) d(-1). (C) 1998 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:179 / 197
页数:19
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