Arsenic removal was characterized at 31 iron
removal plants in Illinois representative of many
similar facilities in the upper Midwest. The plants
used different iron removal processes and had a
wide range of arsenic, iron, and total organic carbon
concentrations.
Iron concentration in raw water is an important
factor in arsenic removal. Removal of arsenic depends
on oxidation of arsenite to arsenate, adsorption of
arsenic to hydrous ferric oxide (HFO), and filtration to
remove HFO and any adsorbed arsenic. In the current
work, soluble arsenic concentrations were lowered by
at least 75% when the iron concentration of the raw
water was > 3 mg/L Fe.
In both models of soluble arsenic removal developed
in this research, adsorption to HFO was assumed
to be the only reaction that removes arsenic from solution.
A generalized double-layer model generally
underpredicted arsenic removal, whereas a parametric
model that was consistent with surface complexation
and accounted for the effects of other adsorbing substances,
fit the data fairly well. Includes 54 references, tables, figures.
| Edition : | Vol. 100 - No. 9 |
| File Size : | 1
file
, 560 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 12 |
| Published : | 09/01/2008 |
