REMOVAL OF ARSENIC FROM GROUND WATER BY MICELLER ENHANCED ULTRAFILTERATION: REVIEW PAPER
International Journal of Research Publication, 3 (100315201899):
6 (April 2018)DOI: 100315201899.pdf
Abstract
The effects of type of complexing agent, pH value and applied pressure on retention coefficients of Zn(II) and Cd(II) complexes were investigated. At best operating conditions (pH = 9.0, p = 300 kPa) using diethylaminoethyl cellulose, the removal of Cd2+ and Zn2+ was more than 95% and 99%, respectively. The removal characteristics of arsenate using micellar-enhanced ultrafiltration (MEUF) were investigated. Among four different cationic surfactants used, hexadecylpyridinium chloride (CPC) showed the highest removal efficiency of arsenic (96%), and the removal efficiency with hexadecyltrimethylammonium bromide (CTAB) was 94%. But the removal efficiency with benzalkonium chloride (BC) was the lowest (57%) due to higher critical micelle concentration (CMC) of BC than those of other surfactants. Over 80% of arsenic was removed with octadecylamine acetate (ODA). On the effect of solution pH on the arsenic removal, since the valance of arsenate decreases from trivalent to monovalent as pH decreases, the removal was reduced at lower pH. The presence of 0.45 mM of nitrate and 0.01 mM of phosphate reduced the removal efficiency by 5–8%. This decrease was because of the competition between the arsenate, nitrate and phosphate for the binding sites of the surfactant micelle. Similar decrease in the removal of arsenate was observed with CPC, CTAB and ODA in the presence of these anions