TY - JOUR
T1 - Removal of arsenic from water by zero-valent iron
AU - Bang, Sunbaek
AU - Korfiatis, George P.
AU - Meng, Xiaoguang
PY - 2005/5/20
Y1 - 2005/5/20
N2 - Batch and column experiments were conducted to investigate the effect of dissolved oxygen (DO) and pH on arsenic removal with zero-valent iron [Fe(0)]. Arsenic removal was dramatically affected by the DO content and the pH of the solution. Under oxic conditions, arsenate [As(V)] removal by Fe(0) filings was faster than arsenite [As(III)]. Greater than 99.8% of the As(V) was removed whereas 82.6% of the As(III) was removed at pH 6 after 9 h of mixing. When the solution was purged with nitrogen gas to remove DO, less than 10% of the As(III) and As(V) was removed. High DO content and low solution pH also increased the rate of iron corrosion. The removal of arsenic by Fe(0) was attributed to adsorption by iron hydroxides generated from the oxic corrosion of Fe(0). The column results indicated that a filtration system consisting of an iron column and a sand filter could be used for treatment of arsenic in drinking water.
AB - Batch and column experiments were conducted to investigate the effect of dissolved oxygen (DO) and pH on arsenic removal with zero-valent iron [Fe(0)]. Arsenic removal was dramatically affected by the DO content and the pH of the solution. Under oxic conditions, arsenate [As(V)] removal by Fe(0) filings was faster than arsenite [As(III)]. Greater than 99.8% of the As(V) was removed whereas 82.6% of the As(III) was removed at pH 6 after 9 h of mixing. When the solution was purged with nitrogen gas to remove DO, less than 10% of the As(III) and As(V) was removed. High DO content and low solution pH also increased the rate of iron corrosion. The removal of arsenic by Fe(0) was attributed to adsorption by iron hydroxides generated from the oxic corrosion of Fe(0). The column results indicated that a filtration system consisting of an iron column and a sand filter could be used for treatment of arsenic in drinking water.
KW - Adsorption
KW - Arsenic
KW - Filtration
KW - Groundwater
KW - Iron
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U2 - 10.1016/j.jhazmat.2005.01.030
DO - 10.1016/j.jhazmat.2005.01.030
M3 - Article
C2 - 15885407
AN - SCOPUS:18844421377
SN - 0304-3894
VL - 121
SP - 61
EP - 67
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
IS - 1-3
ER -