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| Bacteria-Enhanced Remediation of Electronic-Waste Polluted Farmland Soil |
| Received:November 18, 2014 |
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| KeyWord:electronic waste;heavy metals;metal-tolerant bacteria;farmland soil;enhanced remediation |
| Author Name | Affiliation | E-mail | | CHEN Jia-liang | Guangdong Provincial Academy of Environmental Science, Guangzhou 510045, China
South China Institute of Environmental Science, MEP, Guangzhou 510655, China | | | LIU Xiao-wen | South China Institute of Environmental Science, MEP, Guangzhou 510655, China | | | ZHANG Xiao-mang | Centre of Environment Protection Propagation and Education of Guangdong, Guangzhou 510630, China | | | ZHANG Ya-jing | South China Institute of Environmental Science, MEP, Guangzhou 510655, China | | | FANG Xiao-hang | South China Institute of Environmental Science, MEP, Guangzhou 510655, China | fangxiaohang@scies.org |
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| Abstract: |
| Qingyuan is one of the biggest electronic waste(e-waste) dismantling areas in China. Over 20-year operations of individual e-waste workshops there have resulted in severe pollution of the surrounding soils by Cd, Cu and Pb. Remediation of e-waste polluted soils has drawn scientific and public attentions. In our previous study, four strains of metal tolerant bacteria were identified from the soils contaminated by e-wastes in Qingyuan, using colony morphology analysis, scanning electron microscope and 16S rDNA technology. They were Sporosarcina aquimarina(HS-01), Sporosarcina saromensis(JH-02), Bacillus megaterium(YB-03) and Bacillus methylotrophicus(JY-04). Here we used these four strains and a non-contaminated ecotype of plant Sedum alfredii to test their potential for remediating soils polluted by Cd, Cu and Pb under greenhouse conditions. Results show that the shoots of S. alfredii accumulated the highest amount of heavy metals in the presence of JH-02 bacteria, followed by JY-04 bacteria. Bacteria JH-02 and JY-04 exhibited better performance in mobilizing heavy metals, and exchangeable metal fraction was significantly higher in the JH-02 and JY-04 treatments than in other bacterial treatments(P<0.05). Our present study suggest that the bacteria JH-02 and JY-04 may be able to enhance the extraction of soil heavy metals by S. alfredii, and thus have a potential to be applied to the field. |
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