석회석 광산 갱내충전을 위한 순환유동층 보일러 바닥재로부터 중금속의 용출 특성 평가
Leaching Characteristics of Heavy Metals in the Bottom Ash from Circulating Fluidized Bed Combustion, in Order for Application to Limestone Mine Backfilling
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초록
본 연구에서는 순환유동층 보일러에서 발생하는 바닥재를 광산의 갱도 또는 채굴적에 채움재로 재활용함에 있어 시공 후 환경적 안정성을 평가하기 위해 USEPA 1311(TCLP), 1312(SPLP), 1313(특정 pH), 국내 폐기물 용출시 험법(KSLT), 용출액 pH에 따른 Cd, Cr, Cu, Ni, Pb, Zn의 용출특성을 비교·평가하였다. 추가로 국내 18개소의 가행 석 회석 광산에서 배출되는 갱내수를 대상으로 바닥재와의 접촉에 의한 각 중금속의 용출 특성을 조사하였다. 실험 결과, 용출액의 pH가 낮아질수록 바닥재로부터 중금속의 용출량은 증가하는 경향을 보였다. USEPA 1313법의 가장 낮은 pH (eluate pH 2) 조건에서 Ni와 Zn은 최대 약 2.2 mg/L까지 용출되었으며, 이와 함께 본 연구에서 선정한 모든 용출 조건에서 용출된 중금속의 양은 국내 폐기물 관리법 혹은 먹는물 수질기준을 초과하지 않았다.
Abstract
In this study, the leaching characteristics of heavy metals including Cd, Cr, Cu, Ni, Pb, and Zn in CFBC bottom ash were evaluated to applying bottom ash for mine backfilling. The environmental safety of metals in bottom ash was determined by eluate pH variation and conventional leaching tests including USEPA method 1311 (TCLP), 1312 (SPLP), 1313 (specified pH), and Korean leaching test for industrial wastes (KSLT). In addition, it was also investigated that the leaching characteristics of heavy metals from the bottom ash by contact with limestone mine drains in Korea. The experimental results showed that the leaching of heavy metals from the bottom ash increased with decreasing eluate pH. Although Ni and Zn were leached up to approximately 2.2 mg/L in a strongly acidic leaching condition (eluate pH 2; USEPA method 1313), the amount of leached metals by the leaching tests applied in this study met the standards for Korean waste control and drinking water.
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