중금속 오염토양 중 납, 구리, 아연의 구연산 침출에 미치는 과산화수소 첨가의 영향
The Effect of Hydrogen Peroxide Addition on the Citric Acid Leaching of Lead, Copper, and Zinc from Contaminated Soil with Heavy Metals
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초록
소화기 훈련장, 클레이 사격장, 그리고 항만 퇴적토 등의 오염토양으로부터 중금속을 제거하기 위해 과산화 수소 함유 구연산용액을 이용하여 납, 구리, 아연의 침출거동을 조사하였다. 침출결과는 납, 구리, 아연의 화학형태와 비교하였는데 이는 Tessier의 연속추출법에 의해 조사되었으며, 이 방법은 이온교환태, 탄산염결합태, 산화물결합태, 유기물(황화물)결합태, 잔류물로 분류하여 분석할 수 있다. 침출결과는 1 몰 구연산용액만을 이용하는 경우 이온교환 태, 탄산염결합태, 산화물결합태와 같은 풍화된 형태 중의 중금속을 침출할 수 있다는 것을 나타냈으며, 과산화수소 를 첨가하는 경우 유기물(황화물)결합태와 잔류물 중의 중금속 침출을 가속화하였다. 따라서 구연산 침출과정에서 과산화수소 첨가농도가 증가함에 따라 납, 구리, 아연의 침출효율이 증가하는 것을 알 수 있다.
Abstract
The leaching behaviors of Pb, Cu, and Zn using citric acid solution with hydrogen peroxide were investigated for the removal of metals from contaminated soils such as small arms training site, clay-pigeon shooting area, and harbor sediments. The leaching results were compared with chemical forms of Pb, Cu, and Zn. The chemical forms were investigated by Tessier’s sequential extraction method, which consists of five fractions such as ‘exchangeable’, ‘bound to carbonate’, ‘bound to oxide’, ‘bound to organic matter (or sulfide)’, and ‘residue’. The leaching results show that 1 mol·l-1 citrate leach solution could extract the weathered form containing ‘exchangeable’, ‘bound to carbonate’, and ‘bound to oxidize’, and that the addition of hydrogen peroxide accelerates the leaching of metals belonged to the fractions of ‘bound to organic matter (or sulfide)’ and ‘residue’. Therefore, the leaching efficiencies of Pb, Cu, and Zn increased with increasing hydrogen peroxide concentration during citric acid leaching.
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