Bioleaching of arsenic from medicinal realgar by pure and mixed cultures

被引：77
|
作者：
Zhang, Jinghong [1 ]
Zhang, Xu [1 ]
Ni, Yongqing [1 ]
Yang, Xiaojuan [1 ]
Li, Hongyu [1 ]
机构：
[1] Lanzhou Univ, Sch Life Sci, MOE Key Lab Arid & Grassland Ecol, Lanzhou 730000, Peoples R China
来源：
PROCESS BIOCHEMISTRY | 2007年 / 42卷 / 09期
关键词：
Acidithiobacillus ferrooxidans; Acidithiobacillus thiooxidans; realgar; bioleaching; Chinese mineral medicine; AMORPHOUS AS2S3 OXIDATION; THIOBACILLUS-FERROOXIDANS; SULFIDE MINERALS; SULFUR; ORPIMENT; PH; 25-DEGREES-C; 40-DEGREES-C; MECHANISMS; ATTACHMENT;
D O I：
10.1016/j.procbio.2007.05.021
中图分类号：
Q5 [生物化学]; Q7 [分子生物学];
学科分类号：
071010 ; 081704 ;
摘要：
The aim of this paper is to determine the efficiency of bioleaching of arsenic in realgar, a Chinese mineral drug, using pure cultures of Acidithiobacillus ferrooxidans or Acidithiobacillus thiooxidans and a mixed culture of A. ferrooxidans and A. thiooxidans. The experiments were carried out in shaker flasks, at 150 rpm, 30 degrees C at a culture pH of 1.80. To investigate the mechanism of the bioleaching in realgar, media with and without ferrous iron were chosen for the experiments. The results showed that the leaching rate of arsenic in realgar after 20 days was higher (43%) in A. ferrooxidans cultures with ferrous iron compared to cultures without ferrous iron (10%), and the leaching rate of A. thiooxidans cultures only increased from 21% to 23% in the presence of ferrous iron. The leaching rate of arsenic in mixed culture with ferrous iron was greatly enhanced from 16% to 56%, indicating that bioleaching in mixed culture is preferable for the dissolution of realgar. (c) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1265 / 1271
页数：7
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