不同电子供体条件下不动杆菌 SZ28 去除 Cd(II)和硝酸盐的特性研究。
Characterization of the Cd(II) and nitrate removal by bacterium Acinetobacter sp. SZ28 under different electron donor conditions.
机构信息
Key Laboratory of Northwest Water Resources, Environment and Ecology, Ministry of Education, Xi' an University of Architecture and Technology, Xi'an, 710055, China.
Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
出版信息
Environ Sci Pollut Res Int. 2019 May;26(13):12698-12708. doi: 10.1007/s11356-019-04770-6. Epub 2019 Mar 15.
In this study, zero-valent iron (ZVI), nanoscale zero-valent iron (nZVI), Fe(II), and Mn(II) were investigated for their effects on mixotrophic denitrification coupled with cadmium (Cd(II)) adsorption process by Acinetobacter sp. SZ28. The removal rates of nitrate were 0.228 mg L h (ZVI), 0.133 mg L h (nZVI), 0.309 mg L h (Fe(II)) and 0.234 mg L h (Mn(II)), respectively. The Cd(II) removal efficiencies were 97.23% (ZVI), 95.79% (nZVI), 80.63% (Fe(II)), and 84.58% (Mn(II)), respectively. Meteorological chromatography analysis indicated that the characteristics of gas composition were different under different electron donor conditions. Moreover, characterization of bacterial metabolites produced by strain SZ28 under different conditions was analyzed. Sequence amplification identified the presence of the nitrate reductase gene (napA) and Mn(II)-oxide gene (cumA) in strain SZ28. The results of XRD and SEM indicated that ZVI, nZVI, Fe(II), and Mn(II) were oxidized into corresponding oxides. XPS spectra indicated that the Cd(II) was adsorbed onto biogenic precipitation.
在这项研究中，研究了零价铁 (ZVI)、纳米零价铁 (nZVI)、Fe(II) 和 Mn(II) 对混合营养型反硝化耦合 Cd(II) 吸附过程的影响，所用菌株为不动杆菌 SZ28。硝酸盐的去除率分别为 0.228 mg L h (ZVI)、0.133 mg L h (nZVI)、0.309 mg L h (Fe(II))和 0.234 mg L h (Mn(II))。Cd(II) 的去除效率分别为 97.23% (ZVI)、95.79% (nZVI)、80.63% (Fe(II))和 84.58% (Mn(II))。气象色谱分析表明，在不同电子供体条件下，气体组成的特征不同。此外，还分析了在不同条件下菌株 SZ28 产生的细菌代谢物的特性。序列扩增鉴定出菌株 SZ28 中存在硝酸盐还原酶基因 (napA) 和 Mn(II)-氧化物基因 (cumA)。XRD 和 SEM 的结果表明 ZVI、nZVI、Fe(II) 和 Mn(II) 被氧化成相应的氧化物。XPS 谱表明 Cd(II)被吸附到生物沉淀上。
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