Biotreatment of Mn2+ and Pb2+ with Sulfate-Reducing Bacterium Desulfuromonas alkenivorans S-7
Biotreatment of Mn2+ and Pb2+ with Sulfate-Reducing Bacterium Desulfuromonas alkenivorans S-7
复制标题
硫酸盐还原菌 Desulfuromonas alkenivorans S-7 对 Mn2+ 和 Pb2+ 的生物处理
DOI：
10.1061/(asce)ee.1943-7870.0001330
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发表时间：
2018-03-01
影响因子：
2.2
通讯作者：
Tang, Jun
中科院分区：
文献类型：
--
作者：
Miao, Zhen-yong;He, Huan;Tang, Jun
Biotreatment of heavy metals in acid mine drainage (AMD) with sulfate-reducing bacteria (SRB) is considered the most promising technique in the ecological restoration of mines. In the present work, the authors evaluated the ability of bioprocessing acidic water (pH = 6.0) containing different concentrations of Mn2+ (ranging from 1.0 to similar to 102.28 mg/L) and Pb2+ (ranging from 1.0 to similar to 11.6 mg/L) and coexisting with sulfate (0.8-1.1 g/L) with a native SRB Desulfuromonas alkenivorans S-7 obtained from a coal gangue dump. Furthermore, the organic functional groups and sulfur components involved in the bioprocess mediated with SRB were investigated with Fourier transform infrared spectroscopy (FT-IR) and detailed in a Peakfit analysis. The results showed that the S-7 strain could remove 93.1% Mn2+ and 90.0% Pb2+ from acid mine drainage after 7 days' culture, respectively. Three clear stages of biotreatment of Mn2+ and Pb2+ were identified as initial rapid precipitation, subsequent absorption, and a final equilibrium state. The removal of heavy metals included chemical precipitation and biosorption. FT-IR spectroscopy results showed that the OH, NH2, C=O, and amide group might play an important role in the absorption of Mn2+ and Pb2+ by extracellular polymeric substances. Furthermore, the intermediate sulfite products of the sulfate-reducing process were also identified in the cell samples. The present study proves that biotreatment of heavy metals with a native SRB S-7 is possible, and thus provides potential information for its future application in the ecological restoration of coal gangue dumps. (c) 2017 American Society of Civil Engineers.
