Remediation Of Arsenic Contaminated Soil
Using Soil Washing With An Acidic And
Reducing Solution
Author(s)
J. G. Kim, J. H. Lee, Y. C. Cho & S. H. Park
Abstract
Soil contamination with arsenic (As) is a serious environmental concern due to
its highly toxicity and carcinogenic property. Iron oxides are known to be the
most important factor for controlling As concentration in soil pore water. They
adsorb large amount of As and coprecipitate with As. We tried to develop a new
washing method of As contaminated soil by the dissolution of iron oxide and
desorption of As employing pH and redox potential adjustment. An As
contaminated soil sample was collected at a rice paddy field near a copper
smelter, Korea. The As concentration of the soil sample was determined with an
aqua-regia extraction method. Washing solutions were prepared to be 0.001–
0.1N HCl and 0–3% Na-dithionite. The soil and washing solution were mixed at
1:4 ratio and the mixtures were reacted for 15, 30, 45 and 60 minutes. After the
reaction, the soil and washing solution were separated with a centrifugation. The
pH, Eh and concentrations of As, Fe and Mn of the washing solution were
determined and the As concentration of the washed soil sample was also
determined. The separated washing solution was treated with H2O2, CaCl2·2H2O
and cationic organic polymer to remove As. The soil washing with the 0.01N
HCl_3% Na-dithionite solution for 30 minutes was the most effective in the As
removal from the soil reducing As concentration from 43 mg/kg to 18 mg/kg.
The As concentration of the washing solution was reduce from 19.2 mg/L to
0.76 mg/L after the waste water treatment.
Keywords: soil washing, arsenic, pH, Eh.
Keywords
soil washing, arsenic, pH, Eh
Related Book
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