Research Paper (Special Issue)
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Bacteria that adsorb Cd were isolated from metal contaminated soil and identified as Exiguobacteriumspecies. The effect of the isolated bacteria on metal immobilization was evaluated by pot experiment using heavy metal contaminated soils collected from abandoned mine sites. The Exiguobacterium sp. reduced the uptake of Cd by 30% in lettuce leaves, and Pb and Zn by 61% and 54% in lettuce roots, respectively, in the case of extremely high metal concentrations in soil. Bacteria decreased the mobile heavy metal contents and increased the organic bound metal fraction in bulk soil. In the case of extremely high soil metal concentration, bacterial treatment did not lead to significant differences in the heavy metal speciation within the soil. Nevertheless, immobilization of heavy metals by biosorption in the soil can facilitate the establishment of vegetation in mine soil, thereby mitigating the potential risk of distribution and leaching of heavy metals.
중금속으로 오염된 토양에서 분리된 카드뮴을 흡착할 수 있는 세균인 Exiguobacterium sp.를 이용하여 폐광지역에서 채취한 중금속 오염 토양에서 세균에 의한 중금속의 고정화를 식물 생육 실험을 통해 평가하였다.Exiguobacterium sp.를 토양에 처리했을 때 오염 정도가 심한 토양에서 세균은 상추 잎의 카드뮴 함량을 약 30% 감소시켰으며 납과 아연의 함량을 뿌리에서 각각 61%, 54% 감소시켰다. 연속 추출 결과 세균 처리는 벌크토양에서 이동도가 높은 중금속의 함량을 감소시켰으며 유기물과 결합된 형태의 중금속 함량을 증가시켰다. 그러나 그 결과는 토양의 총 중금속 함량에 따라 다르게 나타났으며 오염 정도가 심한 토양에서 세균의 처리는 토양 내 중금속의 존재 형태에 크게 영향을 미치지 않았다. 그럼에도 불구하고 토양에서 생물흡착에 의한 중금속의 고정화는 광산 토양에서 식생 형성을 가능하게 하여 중금속의 분산이나 용출의 잠재적인 위험을 완화시킬 수 있다.
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- Publisher :The Korean Society of Mineral and Energy Resources Engineers
- Publisher(Ko) :한국자원공학회
- Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
- Journal Title(Ko) :한국자원공학회지
- Volume : 53
- No :5
- Pages :431-439
- DOI :https://doi.org/10.12972/ksmer.2016.53.5.431


Journal of the Korean Society of Mineral and Energy Resources Engineers







