비소 및 수은 오염 농경지토양의 복원을 위한 옥살산 및 요오드화 칼륨을 이용한 토양세척공법 적용성 평가
Feasibility Assessment of Soil Washing Using Oxalic Acid and Potassium Iodide for Restoration of Agricultural Soil Contaminated by Arsenic and Mercury
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본 연구는 비소(As) 및 수은(Hg)으로 복합오염 농경지 토양에 물리적 선별 과정 없이 토양세척법을 적용하여 세척효율을 평가하고 농경지 복원의 가능성을 확인하고자 하였다. 물리적 선별을 거치지 않은 원토양(raw) 및 입도구간별 토양 시료에 옥살산(Oxalic acid)과 요오드화칼륨(KI)을 이용한 토양세척공법을 적용하여 세척효과와 점토질 토양을 포함한 농경지 토양에 대한 적용가능성을 평가하였다. 그 결과 각각의 세척용액은 전체 입도구간에서 비소 및 수은에 대하여 80%이상의 제거효율을 보였다. 특히 입도가 0.074 mm 미만인 토양시료 및 원토양시료에서 87% 이상의세척효율을 확인하였다. 이와 같은 결과는 비소 및 수은오염 농경지 토양을 정화 및 복원하기 위하여 물리적 선별과정 없는 토양세척 연구의 실용 가능성 확인과 추후 옥살산 및 요오드화칼륨을순차적으로 세척과정을 배치하는 방식의 세척공정에 대한 연구의 기초자료로 활용될 것으로 기대된다.
Abstract
In this study, we investigated the feasibility of a soil washing method that does not require a physical separation (PS) process in remediating agricultural soil contaminated by arsenic and mercury. Oxalic acid and potassium iodide (KI) were used as washing solutions to remove arsenic and mercury, respectively. Particle sorting by grain size and subsequent washing eliminated at least 80% of the contaminants. The removal capacity of clayey soil grains was 87%, and the same result was observed even when soil sieving was not performed prior to washing. The overall results suggest that soil washing using oxalic acid and KI, without PS, has potential applicability as a remediation method for agricultural soils. Further research on the sequential washing step between the two solutions is required to realize a detailed soil cleanup design.
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