Bacterial immobilization and oxidation of arsenic in acid mine drainage (Carnoules creek, France)
Bacterial immobilization and oxidation of arsenic in acid mine drainage (Carnoules creek, France)
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DOI：
10.1016/s0043-1354(03)00080-0
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发表时间：
2003-07-01
期刊：
影响因子：
12.8
通讯作者：
Elbaz-Poulichet, F
中科院分区：
文献类型：
--
作者：
Casiot, C;Morin, G;Elbaz-Poulichet, F
来自Carnoules尾矿的酸性沃茨（pH = 2.73-3.37）含有高溶解浓度的砷（1-3.5 mmol l（-1））和铁（20-40 mmol l（-1））。在出口处，亚砷酸盐占主导地位。在第一个30米的下降流中，20-60%通过与Fe（III）的共沉淀被除去。这一过程是由细菌介导的As和Fe氧化引起的。小溪中的降水率取决于泉水中的氧浓度，并且在干燥的夏季期间较低，此时泉水的缺氧特性抑制了氧化细菌的活性。非原位实验表明，存在的细菌丰富的沉淀物增加的As和Fe的去除率。分离到3株促进砷氧化的细菌，其中2株具有硫单胞菌（Thiomonasynys 1）的特征。第三个菌株，这是尚未确定的，也催化铁的氧化。(C)2003爱思唯尔科技有限公司。保留所有权利。
The acid waters (pH = 2.73-3.37) originating from the Carnoules mine tailings contain high dissolved concentrations of arsenic (1-3.5 mmol l(-1)) and iron (20-40 mmol l(-1)). At the outlet, arsenite predominates. During the first 30 m of downflow, 20-60% is removed by coprecipitation with Fe(III). This process results from bacterially mediated As- and Fe-oxidation. The precipitation rates in the creek depend on the oxygen concentration in spring water and are lower during the dry summer period when the anoxic character of the spring water inhibits the activity of oxidizing bacteria. Ex situ experiments show that the presence of bacteria-rich precipitates increases the As- and Fe-removal rates. Three strains of bacteria promoting the oxidation of As have been isolated, and two of them have the characteristics of Thiomonas ynys1. The third strain, which is not identified yet, also catalyzes the oxidation of Fe. (C) 2003 Elsevier Science Ltd. All rights reserved.