광산배수 수질특성에 따른 SAPS 기질물질의 적용방안 개선 연구
Application Method for SAPS Substrate Materials According to Mine Drainage Properties
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광산배수의 지구화학적 특징에 따라 SAPS에 적용하는 기질물질이 정화효율에 미치는 영향을 평가하였다. 실험에 사용한 광산배수는 총 5개로 각각의 산도에 따라 두 그룹으로 나누었다. 기질물질은 양송이 버섯 폐상퇴비를 사용하였다. 실험을 진행하는 동안 모든 모든광산배수의 pH가 7.0 이상으로 상승하였고, TOC 및 주요 양이온의 농도 가 증가하였다. 약 14일 경과 후 ORP는 -300 mV를 보여 환원환경이 조성된 것으로 판단되며 Fe와 S의 거동에서도 철 환원과 황환원 반응이 나타났다. 용존된 Fe, Al, Cu, Zn는 실험이 진행된 pH와 ORP조건에서 금속(수)산화물 또는 황 화물로 침전 및 제거 되었다. 그러나 산도가 높고 Fe3+의 농도가 높은 SM의 광산배수에서는 실험이 진행되는 동안 다 량의 황산염이 용존되어 나타났다. 본 결과를 바탕으로 SAPS 설계 시 일관된 기질물질 층을 적용하기 보다는 광산배 수의 지구화학적 특성을 고려하여 기질물질 층의 높이와 기능성 기질물질 층을 고려해야 한다.
Abstract
Batch experiments were carried out to assess the influence of organic substrate in SAPS using five different mine drainages. The mine drainages types were divided into two groups according to their acidity. Mushroom compost was used in the mine drainage remediation experiments as a substrate materials. The pH, TOC, and cation concentrations rapidly increased in all batch experiments after reaction. The ORP values decreased at below -300 mV after the 14th day. The dissolved Fe and S had decreased by iron- and sulfate-reduction after 14 days. The dissolved Fe, Al, Cu, and Zn could be removed as precipitates of metal (hydro)oxides and sulfides at the experimental conditions. However, abundant sulfate remained in the SM mine drainage after remediation experiments. The SM mine was highly acidic and had high Fe3+ concentration, initially. Therefore, the results indicated that the conventional design of an organic substrate layer in SAPS would have to be modified depending on the acidity of the mine drainage.
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