Removal of arsenic and humic substances (HSs) by electro-ultrafiltration (EUF).
A laboratory scale electro-ultrafiltration (EUF) system was developed and used to explore the removal of arsenic and humic substances (HSs) from water. As a negatively charged species, arsenate(V) was readily removed after applying voltage to the EUF cell. Arsenite(III) was removed via EUF after the pH of the water had been adjusted. Meanwhile, the rejection of HSs increased due to the presence of an electric field. This study also showed that the removal of arsenite(III) from water relies primarily on electrostatic and non-electrostatic mechanisms. In the presence of HSs, arsenate(V) complexed with the HSs and was then able to be removed by EUF. This study demonstrates that EUF is a highly promising means of removing arsenic from water.
Weng
Yu-Hsiang
YH
Graduate Institute of Environmental Engineering, National Taiwan University, Taipei, Taiwan, ROC.
Chaung-Hsieh
Lin Han
LH
Lee
Hsin-Hua
HH
Li
Kung-Cheh
KC
Huang
C P
CP
D000327:Adsorption; D001151:Arsenic / Q000302:isolation & purification*; D004560:Electricity; D006256:Hazardous Waste / Q000517:prevention & control*; D006812:Humic Substances / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D014462:Ultrafiltration / Q000295:instrumentation / Q000379:methods*; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
D006256:Hazardous Waste; D006812:Humic Substances; D014874:Water Pollutants, Chemical; D014867:Water; D001151:Arsenic