尹静玄,王平,徐海音,张睿琦,赵珮伶,聂香兰,彭创新,龚绘林,梁云涛.耐镉细菌联合电动技术修复镉污染土壤的研究[J].环境科学学报,2020,40(6):2212-2219
耐镉细菌联合电动技术修复镉污染土壤的研究
- Study on the remediation of cadmium contaminated soil by cadmium-tolerant strains combined with electrokinetic remediation technology
- 基金项目：湖南省重点研发项目（No.2016SK2030）；国家自然科学基金（No.51908561）；大学生创新创业训练项目（No.201910538067X，S201910538035）；湖南省教育厅重点项目（No.18A163）
- 尹静玄
- 中南林业科技大学环境科学与工程学院, 长沙 410004
- 王平
- 中南林业科技大学环境科学与工程学院, 长沙 410004
- 徐海音
- 中南林业科技大学环境科学与工程学院, 长沙 410004
- 张睿琦
- 中南林业科技大学环境科学与工程学院, 长沙 410004
- 赵珮伶
- 中南林业科技大学环境科学与工程学院, 长沙 410004
- 聂香兰
- 中南林业科技大学环境科学与工程学院, 长沙 410004
- 彭创新
- 中南林业科技大学环境科学与工程学院, 长沙 410004
- 龚绘林
- 中南林业科技大学环境科学与工程学院, 长沙 410004
- 梁云涛
- 中南林业科技大学环境科学与工程学院, 长沙 410004
- 摘要：为提高传统电动技术对重金属污染土壤的修复效果以及经济效益，本研究采用耐镉细菌联合电动修复技术修复镉污染土壤.通过在含镉土壤中接种3种耐镉细菌Escherichia coli strain、Bacillus sp.和Bacillus cereus strain，以电压梯度1 V·cm-1通电10 d，比较不同耐镉细菌对土壤Cd去除和形态转化，以及电能消耗的影响.结果表明，接种Escherichia coli strain、Bacillus sp.、Bacillus cereus strain的试验组比传统电动修复的Cd去除率分别提高7.63%、17.21%、19.53%；单位修复能耗分别降低64.78、109.52、116.54 kW·min·mg-1.由于Bacillus cereus strain对Cd2+的吸附量高于Escherichia coli strain和Bacillus sp.，且能有效降低土壤中Cd的生物毒性，因此采用Bacillus cereus strain联合电动技术修复镉污染土壤时效果最佳，Cd去除率达到30.77%，单位修复耗能为48.94 kW·min·mg-1.
- Abstract：To improve the treatment and cost efficiency of traditional electrokinetic (EK), this study used Cd-tolerant strains combined with EK on cadmium (Cd) contaminated soil remediation. Cd removal and energy consumption were evaluated by inoculating different Cd-tolerant strains, Escherichia coli, Bacillus sp. and Bacillus cereus in soil with 10 days under a 1V·cm-1. The results showed that the Cd removal efficiency with Escherichia coli, Bacillus sp. and Bacillus cereus was 7.63%, 17.21% and 19.53% respectively, which were higher than traditional EK treatment. In addition, the energy consumption with Escherichia coli, Bacillus sp. and Bacillus cereus was 64.78, 109.52 and 116.54 kW·min·mg-1 respectively, which were lower than traditional EK treatment. Bacillus cereus had a higher adsorption capacity and a lower toxicity of Cd in soil than Escherichia coli and Bacillus sp.. So Bacillus cereus combined with EK was applied and achieved the highest Cd removal efficiency of 30.77% and the lowest energy consumption 48.94 kW·min·mg-1.
