시멘트와 산업부산물을 이용한 아연과 카드뮴으로 오염된 토양의 고형화 공법 적용성 검토
Investigation of Suitability for Solidification of Zn and Cd Containing Soil Using Cement and Industrial By-products
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아연과 카드뮴으로 오염된 지역에 대한 고형화 공법의 적용성과 시멘트와 산업부산물의 혼합비율을 검토하기 위하여 조사지역 내 오염토양을 채취하여 실내시험을 실시하였다. 오염토양에 시멘트(혹은 시멘트+산업부산물)를 일정한 비율(5%, 10%, 그리고 15%)로 첨가하고 혼합한 후, PVC 몰드를 이용해서 공시체를 제작하여 습윤양생(1주, 2주 그리고 4주)한 후, 중금속 용출량과 압축강도를 측정하였다. 분석한 결과 아연과 카드뮴은 양생기간과 처리재료의 혼합비에 따른 차이가 거의 없이 대부분 용출되지 않았고, 압축강도는 시멘트(C)첨가량이 증가하고 양생기간이 길수록 증가 하는 것으로 나타났고, 비회(F)와 고로슬래그(S)의 첨가 혼합비가 증가할수록 강도는 낮아지는 경향을 나타내었다. 따라서 조사지역은 고형화 공법을 적용시 좋은 효과가 나타날 것으로 판단되며, 건조토 중량에 대해 보통 포틀랜드 시멘트 5% 이상만 첨가하여 혼합해 주거나 산업부산물을 첨가(시멘트 중량의 10~20%)하여 준다면 중금속 오염성분의 용출을 경제적이고 효율적으로 저감시킬 수 있을 것으로 판단되었다.
Abstract
To investigate suitability of solidification for the heavy metals(Zn, Cd) contaminated area and mixing ratio of cement and industrial by-products(Fly ash, Blast furnace slag), contaminated soil was collected from the study area and a laboratory was carried out in the indoor. The cement(5%, 10%, 15% mixing ratio by weight of dried soil) and industrial by-products(10%, 20% mixing ratio by weight of cement) added to contaminated soil, specimens which is mixed with soil, cement and industrial by-product was made by PVC molds, and wet curing was conducted during 28days(7days, 14days and 28days). After wet curing, tests were conducted on the compressive strength and analysis of heavy metal concentration. As a result, most of zinc and cadmium were not detected without difference by mixing ratio of treatment materials and curing period, it was observed that compressive strength increases as mixing ratio of cement increased and curing period was long, and compressive strength decreases as mixing ratio of industrial by-products(Fly ash, Blast furnace slag) increased. Therefore it is expected that Zn and Cd in soil of the study area could be reduced with addition of 5% mixing ratio of cement.
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