Removal of arsenic in tailings by soil flushing and the remediation process monitoring.
In order to investigate the optimum conditions for the application of soil flushing of arsenic, a batch test was carried out using EDTA at various concentration and pH levels. Based on the optimum condition derived from the batch test, a column test was conducted to examine the feasibility of the soil-flushing technology under field-equivalent conditions. In this column test, a low flushing solution flow rate showed a significantly higher As removal efficiency (71.6%) than a high flow rate (56.3%). TCLP (toxicity characteristic leaching procedure) and a seed germination test were carried out to monitor the toxicity both during and after the treatment. The finally treated tailings were shown to be significantly remediated, having a reduced toxicity by both the TCLP and seed germination tests.
Lee
Sang-Woo
SW
Department of Environmental Science and Engineering, Kwangju Institute of Science and Technology (K-JIST), 1 Oryong-dong Puk-gu, Kwangju, 500-712, Korea.
Kim
Ju-Yong
JY
Lee
Jong-Un
JU
Ko
IlWon
I
Kim
Kyoung-Woong
KW
D000383:Agriculture; D001151:Arsenic / Q000302:isolation & purification* / Q000378:metabolism*; D002614:Chelating Agents / Q000737:chemistry; D004492:Edetic Acid / Q000737:chemistry; D004784:Environmental Monitoring / Q000379:methods; D018525:Germination; D006863:Hydrogen-Ion Concentration; D012639:Seeds; D012989:Soil Pollutants / Q000302:isolation & purification* / Q000378:metabolism*; D018675:Toxicity Tests; D014872:Water Movements
D002614:Chelating Agents; D012989:Soil Pollutants; D004492:Edetic Acid; D001151:Arsenic
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