Simultaneous Removal of Lindane,Lead and Cadmium from Soils by Rhamnolipids Combined with Citric Acid |
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| Authors: | Jinzhong Wan Die Meng Tao Long Rongrong Ying Mao Ye Shengtian Zhang Qun Li Yan Zhou Yusuo Lin |
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| Institution: | 1. Nanjing Institute of Environmental Science, Ministry of Environmental Protection of China, Nanjing, China.; 2. State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control, Nanjing, China.; 3. State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China.; Old Dominion University, UNITED STATES, |
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| Abstract: | This study investigated the performance of rhamnolipids-citric acid mixed agents in simultaneous desorption of lindane and heavy metals from soils. The capacity of the mixed agents to solubilize lindane, lead and cadmium in aqueous solution was also explored. The results showed that the presence of citric acid greatly enhanced the solubilization of lindane and cadmium by rhamnolipids. A combined effect of the mixed agents on lindane and heavy metals removal from soils was observed. The maximum desorption ratios for lindane, cadmium and lead were 85.4%, 76.4% and 28.1%, respectively, for the mixed agents containing 1% rhamnolipidsand 0.1 mol/L citric acid. The results also suggest that the removal efficiencies of lead and cadmium were strongly related to their speciations in soils, and metals in the exchangeable and carbonate forms were easier to be removed. Our study suggests that the combining use of rhamnolipids and citric acid is a promising alternative to simultaneously remove organochlorine pesticides and heavy metals from soils. |
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