Field 규모 연속 토양세척공정을 이용한 비소 오염토양 정화 효율 평가 = Performance Evaluation of the Field Scale Sequential Washing Process for the Remediation of Arsenic-Contaminated Soils

다국어 초록 (Multilingual Abstract)

This study was carried out to evaluate the feasibility of field-scale sequential soil washing process for remediation on Kyongsangnamdo D mine soils which was heavily contaminated by arsonic. Arsenic concentration of untreated soils was $321\pm32mg/kg$. By applying the basic operating condition which was proposed from several pilot-scale experiments, arsenic concentration of treated soils was reduced 2.04 mg/kg ($99\%$ removal efficiency). We optimized the basic operating condition (mainly on washing solution concentration, cut-off size, and mixing ratio) to improve efficiently and economically the field-scale sequential soil washing process. The resulting optimized conditions were that solution concentration is 0.2M HCl, 1.0M HCl, 1.0M NaOH, that the cut-off size is 0.15mm (seive $\sharp$100), and that the mixing ratio is 1 3. Also, the optimized pH value for soil washing effluent treatment was 6 (33 ppb), in which the precipitation disruption caused by supersaturation of the floe did not occur. Results of TCLP tests showed that arsenic concentration from the washed gravels was 1.043 mg/L, that from soils ND (not detected), and that from filter cakes 0.066 mg/L. Also, the water content as a percentage of dewatered sludges was low $(48\%)$ and so the dewatered sludges can be disposed by landfilling. Through these results, we can concluded that tile field-scale sequential soil washing process developed in this study is adopted for remediation of arsenic-contaminated soils.

참고문헌 (Reference)

1 "폐기물관리법." 2002d

2 "폐기물공정시험법" 2002b

3 "폐광산 지역의 비소오염에 대한 복원목표 설정 미래 토지용도를 고려한 접근방법" 3 (3): 13-29, 1998

4 "토양환경보전법." 2002c

5 "토양오염공정시험법." 2002a

6 "Test Methods for Evaluating Solid wastes" 1997b

7 "Stabilization of Available Arsenic in Highly Contaminated Mine Tailings Using Iron" 37 : 189-195, 2003

8 "Innovative Treatment Technologies: Annual Status Report" 1997a