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Objective & Scope
1. Phytoremediation of soil contaminated with diesel 2. Phytoremediation of soil contaminated with heavy metals 3. Improvement of phytoremediation using surfactant Main Contents Disel fuel contamination is one of the most prevalent forms of pollution in soil. Among many remediation options, bioremediation is the most widely used method since diesel oil has low water solubility, volatility and high biodegradability. However it has been reported that the biodegradation of diesel by microorganisms was inhibited when soil is simultaneously contaminated with heavy metals. In this study, Brassica juncea - metal hyperaccumulating plant - was evaluated in the phytoremediation of diesel-contaminated soil with an ultimate aim to apply phytoremediation to clean-up of soil contaminated simultaneously with diesel and heavy metals. B.juncea showed decrease in germination and growth rates when the concentration of diesel in the soil was over 5,000 ppm. However, when it was around 1,000 ppm, both germination and growth rates did not decrease. Moreover, if B. juncea had been germinated in uncontaminated soil, its growth did not decrease even in the heavily diesel-contaminated soil. The diesel-degrading microorganisms were isolated from soil. These mixed microorganisms consisting of Pseudomonas aeruginosa, Pseudomonas stutzeri and Pseudomonas delafieldii could degrade diesel but did not inhibit the growth of B. juncea when applied to the planted soil. Nonionic surfactant, triton X-100 was tested for the facilitation in the phytoremediation of diesel-contaminated soil. In a greenhouse, B. juncea was evaluated for the efficiency of phytoremediation. As a conclusion, although the degradation of diesel was not significantly improved by plating B. juncea, the B. juncea can be used to remediate soil simultaneously contaminated with diesel and heavy metals owing to its high resistance to diesel and hyperaccumulability of heavy metals. References 1) Phytoremediation of diesel-contaminated soil using Brassica juncea Yong Seok Choi, Thesis of Master (1999), POSTECH, KOREA 2) Phytoremediation of copper-contaminated soil by Begonia evansiana Yeh-Jin Ahn, Thesis of Master (1999), POSTECH, KOREA |
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