Chromate removal from water using surfactant-enhanced crossflow filtration

被引:46
作者
Keskinler, B
Danis, U
Cakici, A
Akay, G
机构
[1] ATATURK UNIV,DEPT ENVIRONM ENGN,TR-25240 ERZURUM,TURKEY
[2] ATATURK UNIV,DEPT CHEM ENGN,TR-25240 ERZURUM,TURKEY
[3] UNIV NOTTINGHAM,DEPT CHEM ENGN,NOTTINGHAM NG7 2RD,ENGLAND
关键词
crossflow filtration; surfactant enhanced filtration; chromate removal; wastewater treatment; surfactant removal;
D O I
10.1080/01496399708000744
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Removal of chromate from water was investigated using the surfactant enhanced crossflow filtration technique in which the cationic surfactant, cetyl trimethylammonium bromide (CTAB), was the carrier for the metal ions. The variation of chromate and surfactant rejections, and permeate flux with time were measured as a function of CTAB/chromate concentration ratio, while maintaining a constant transmembrane pressure drop, membrane pore size, and pH of the feed solution. The method was found to be effective in removing chromate from water. It was observed that the efficiency of chromate removal increased with increasing CTAB/chromate ratio. It was also found that the chromate concentration had a significant effect on the CTAB concentration in the permeate and on the time taken to establish the secondary membrane which consists of a highly viscous surfactant phase in the hexagonal state in the absence of chromate. In the presence of chromate, permeate flux increased at the same CTAB concentration although the surfactant and chromate rejections decreased, indicating lowering of the secondary membrane resistance to permeate flow. These conclusions were confirmed by dead-end filtration experiments which showed that the fouling index decreased by the addition of chromate while the opposite was valid when sodium chloride was present in the surfactant/water/electrolyte ternary system.
引用
收藏
页码:1899 / 1920
页数:22
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