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| Interaction of rhamnolipids-mixed degrading bacteria to enhance removal of parathion from contaminated soils with Bougainvillea speetabilis |
| Received:November 18, 2016 |
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| KeyWord:parathion;contaminated soil;Bougainvillea speetabilis;rhamnolipids;mixed degrading bacteria |
| Author Name | Affiliation | E-mail | | XIN Xin | College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China | | | LIU Jia-nü | College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China | jianv2008@nankai.edu.cn |
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| Abstract: |
| Long term production and application of organophosphorus pesticide have resulted in serious soil contamination. A pot culture experiment under greenhouse conditions was carried out to investigate the interactive effect of rhamnolipids (RH) addition and mixed degrading bacteria (DB) inoculation on the phytoremediation efficiency of Bougainvillea speetabilis for removal parathion from contaminated soils. Results indicated that rhamnolipids addition and mixed degrading bacteria inoculation could promote the growth of Bougainvillea speetabilis, especially for the underground part of plant. Bougainvillea speetabilis could promote the removal of parathion in soil by 1.6 times compared with the control. In plant treatment, the removal of parathion in soil was increased by rhamnolipids addition and mixed degrading bacteria inoculation individually, 50 days later, the removal rate of parathion reached 73.01% and 77.13%, respectively, but only 63.23% for control. The combined effect of rhamnolipids addition and mixed degrading bacteria inoculation could promote the removal of parathion up to 91.96%. Parathion uptake by Bougainvillea speetabilis was mainly concentrated in the underground part, the parathion concentration in aboveground part and underground part reached 153.59, 289.57 μg·g-1 in the control treatment, respectively, rhamnolipids addition and mixed degrading bacteria inoculation could reduce parathion accumulation in Bougainvillea speetabilis significantly (P<0.05). In addition, the presence of Bougainvillea speetabilis could promote soil urease activity, catalase activity and alkaline phosphatase activity significantly (P<0.05), rhamnolipids addition and mixed degrading bacteria inoculation could promote soil enzyme activity in different extent. |
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