근권세균과 옥수수를 이용한 유류 및 중금속 복합 오염토양의 Rhizoremediation
Rhizoremediation of Petroleum and Heavy Metal-Contaminated Soil using Rhizobacteria and Zea mays.
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본 연구에서는 유류 분해능이 있고 식물 성장 촉진능력을가진 Gordonia sp. S2RP-17, 중금속에 내성을 가지며 식물성장촉진 능력이 있는 Serratia sp. SY5 및 옥수수를 이용하여 유류 및 중금속 오염 토양의 정화 특성을 조사하였다. 유류 및 중금속 오염 토양에서 51일간 재배한 옥수수의 평균 뿌리 건중량은 1.9±0.2 g이었으나, 근권세균을 접종한 오염 토양에서 재배한 옥수수의 뿌리 건중량은 5.6±0.7 g로,근권세균 접종에 의해 옥수수의 뿌리의 중량이 유의적으로증가함을 알 수 있었다(p<0.01). 초기에는 토양의 TPH 농도는 21,576±3,426 mg-TPH·kg-dry soil-1이었는데, 51일 후옥수수만을 식재한 토양의 잔류 TPH 농도는 220±98 mg-TPH·kg-dry soil-1이었고, 옥수수와 함께 근권세균을 접종한토양의 잔류 TPH 농도는 20±41 mg-TPH·kg-dry soil-1이었다. 이러한 결과로부터 옥수수 식재에 의해 대부분의 TPH 를 제거할 수 있으며, 옥수수와 함께 근권세균을 접종하면TPH 효율이 조금 더 향상됨을 알 수 있었다. 그러나, 중금속 제거효율에 미치는 근권세균 접종 효과는 거의 없었다.
Abstract
In this study, the rhizoremediation of petroleum and heavy metal-contaminated soil was characterized employing Zea mays and two plant-growth promoting rhizobacteria, Gordonia sp. S2RP-17 and Serratia sp. SY5 which have petroleum-degrading activity and heavy metal-resistance, respectively. After 51 days, the average dry weights of Zea mays’ root without and with the inoculation of rhizobacteria were 1.9±0.2 and 5.6±0.7 g, respectively. Compared with initial TPH concentration in soil (21,576±3,426 mg-TPH·kg-dry soil-1), the residual TPH concentrations were 220±98mg-TPH·kg-dry soil-1 in soil planted with Zea mays, and 20±41 mg-TPH·kg-dry soil-1 in soil planted with Zea mays and inoculated with rhizobacteria. These results indicated that the inoculation of S2RP-17 and SY5could promote TPH removability in soil as well as the growth of Zea mays’ root. There was little positive effect of the rhizobacteria inoculation on the removability of heavy metal such as Cu, Cd and Pb in soil planted with Zea mays.
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