岩石矿物学杂志2009，Vol.28Issue(6)：507-512,6.
As(Ⅴ)对嗜酸性氧化亚铁硫杆菌混合培养物氧化性能的影响
The effect of As(Ⅴ) on the oxidizing capacity of the mixed culture of Acidithiobacillus ferrooxidans
摘要
Abstract
Comparable studies were conducted between chemical oxidation and microbial oxidation of ferrous sulfate by a mixed culture of Acidithiobacillus ferrooxidans in the presence of different concentrations of As(V). Eh, pH and Fe~(2+) concentration were monitored periodically and the final precipitation was analyzed by X-ray diffraction (XRD) and SEM. The data obtained showed and chemical oxidation of Fe~(2+) was very slow with a final oxidizing ratio of <8% and As(V) had no effect on Fe~(2+) oxidation chemically. Slight enhancement of Fe~(2+) oxidation was observed by 100 mg/ L As( V ) in the microbial system. Complete oxidation of Fe~(2+) could be reached in about 60 hours in the presence of A. ferrooxidans with 500 mg~l g/L As( V ). However, microbial Fe~(2+) oxidation was greatly inhibited by 4 g/L As( V ) and about 106 hours were needed for complete oxidation. Initial mole ratios of 100 As/ (As + S) affected the final solid phase and the crystallization of the precipitation. In the microbial system, typical symmetric peaks of jarostie were clearly distinguished in the precipitates with ≤1g/L As( V ) but the crystallization was decreasing with the increase of As( V ) concentration. Only amorphous solid was observed in the precipitate with 4 g/L As( V ). Elemental mapping indicated that As was evenly distributed in the precipitates either by adsorption or by structural incorporation during the iron oxidation. These results provide important information for the treatment of As contamination in AMD regions.关键词
A.ferrooxidans/As(Ⅴ)/黄钾铁矾/酸性矿坑水(AMD)Key words
A. ferrooxidans/ As( V ) / jarosite/ acid mine drainage (AMD)分类
生物科学引用本文复制引用
王红梅,杨小芬,龚林锋,江政波..As(Ⅴ)对嗜酸性氧化亚铁硫杆菌混合培养物氧化性能的影响[J].岩石矿物学杂志,2009,28(6):507-512,6.基金项目
国家重点基础研究发展计划(973计划)资助项目(2007CB815601) （973计划）
国家自然科学基金资助项目(40672081) （40672081）
