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Evaluation of bioaugmentation and biostimulation on arsenic remediation in soil through biovolatilization

文献类型： 外文期刊

作者： Chen, Peng 1 ; Li, Jin 1 ; Wang, Hong-Yan 1 ; Zheng, Rui-Lun 4 ; Sun, Guo-Xin 1 ;

作者机构： 1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China

2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

3.Yunnan Agr Univ, Coll Resources & Environm, Kunming 650201, Yunnan, Peoples R China

4.Beijing Acad Agr & Forestry Sci, Res & Dev Ctr Grasses & Environm, Beijing 100097, Peoples R China

关键词： Arsenic;Remediation;Biovolatilization.;Biostimulation;Bioaugmentation;Genetic engineered Pseudomonas putida KT2440

期刊名称：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH （ 2020影响因子：4.223； 五年影响因子：4.306 ）

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收录情况： SCI

摘要： Arsenic (As) removal through microbially driven biovolatilization can be explored as a potential method for As bioremediation. However, its effectiveness needs to be improved. Biostimulation with organic matter amendment and bioaugmentation with the inoculation of genetic engineered bacteria could be potential strategies for As removal and site remediation. Here, the experiments were conducted to evaluate the impacts of rice straw and biochar amendment, inoculation of genetic engineered Pseudomonas putida KT2440 (GE P. putida) with high As volatilization activity, on microbial mediated As volatilization and removal from three different arseniferous soils. In general, the addition of rice straw (5%) significantly enhanced As methylation and volatilization in comparison with corresponding non-amended soils. Biochar amendments and inoculation of the GE P. putida increased As methylation and volatilization, respectively, but less than that of rice straw addition. The effectiveness of As volatilizations are quite different in the various paddy soils. The combined amendments of rice straw and GE P. putida exhibited the highest As removal efficiency (483.2 mu g/kg/year) in Dayu soil, with 1.2% volatilization of the total As annually. The highest water-soluble As concentration (0.73 mg/kg) in this soil could be responsible for highest As volatilization besides the rice straw and bacteria in this soil.

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