석산개발에 따른 주변 환경오염 및 석분토 처리를 위한 연구 = Environmental Contamination and Best Management of Stone-dust from Quarry Mine

국문 초록 (Abstract)

이번 연구에서는 석산 내부(광산) 및 외부(주변 환경)에서 채취한 모든 물 시료와 응집제를 함유한 석분토에 대해서 중금속, 시안, 독성 유기화합물 및 유기인의 총함량을 분석하였다. 그리고 EDTA 용출실험법 및 산농도 변화에 따른 용출실험법 등을 이용하여 석분토를 장기간 석산 내부에 보관할 경우 발생할 수 있는 중금속 원소의 용출특성을 평가하였다. 모든 물 시료와 석분토에서 검출된 $Cr^{6+}$, Hg, CN, TCE/PCE 및 총 인의 농도는 모두 검출한계 이하로, 오염되지 않았음을 확인하였다. 석산 내부 및 외부에서 채취한 물 시료에서는 Pb과 CD이 검출되지 않았고 구리와 아연은 일부 시료에서만, 비소는 일반적으로 검출되었으나 검출된 비소 함량은 모두 먹는 물 수질기준보다 훨씬 낮은 값을 보여주고 있다. EDTA 및 산도변화를 이용한 용출실험 등의 결과에서 Pb, Cr, Cd, Cu 및 Zn의 용출함량은 검출한계 이하 혹은 매우 낮은 함량만이 검출되었으며, 비소는 pH 3의 용출실험에서 검출되었다. 따라서 석산 개발에 따른 수계 오염은 없는 것으로 판단된다.

다국어 초록 (Multilingual Abstract)

All of the water and stone-dust samples with or without flocculant, in and around quarry mines, were analyzed for total concentrations of heavy metals, cyanide(CN), toxic organic compounds and organic phosphorus. Extraction experiments on stone-dust by EDTA and various pH solutions were also carried out, in order to evaluate the contaminant leaching from the long-term heaped stone-dust within quarry mines. The concentrations of $Cr^{6+}$, Hg, CN, TCE/PCE and total phosphorus in all samples (water and stone-dust) were under detection limits, confirming no environmental contamination from stone-dust in quarry mine areas. Lead and cadmium were not detected in all water samples. Copper and zinc were found in some water samples, and arsenic was detected in a few water samples. But they also showed levels much lower than the drinking water standard. Results of the extraction experiments by EDTA and pH solutions showed that Pb, Cr, Cd, Cu and Zn were leached out in less amounts or under detection limits. Arsenic was detected only at pH 3. From above results, we suggested that environmental contamination by quarry mine development is likely to be minor or negligible.

참고문헌 (Reference)

1 Chung, Y.S., "variation and cause of acidic precipitation from a monitoring network in Korea" 30 : 2429-2435, 1996

2 Nyamangara, J., "The effect of long-term sewage sludge application on Zn, Cu, Ni and Pb levels in a clay loam soil under pasture grassin Zimbabwe" 73 : 199-204, 1999

3 Barona, A., "Metal associations in soils before and after EDTA extractive decontamination: implications for the effectiveness of further clean-up procedures" 113 : 79-85, 2001

4 Fytianos K., "Leaching of heavy metals from municipal sewage sludge" 24 : 467-475, 1998

5 Sun, B., "Leaching of heavy metals from contaminated soils using EDTA" 113 : 111-120, 2001

6 Lee, P.K., "Geochemical Atlas of Korea (1:1,800,000), Series 9" KIGAM 68-, 2007

7 Lee, B.K., "Chemical composition of precipitation and wet deposition of major ions on the Korean peninsular" 34 : 563-575, 2000

8 Tarvainen, T., "Baselines of certain bioavailable and total heavy metal concentrations in Finland" 17 : 975-990, 2002