Impact of Bacterial Reduction on the Stability of Hydrometallurgical Arsenic Containing Solid Wastes
Millions of arsenic bearing wastes from hydrometallurgical processing are disposed in tailing ponds. However, the stability of the generated ironarsenate coprecipitate under anoxic condition is still of concern. In this work, we investigated anaerobic microbial mediated reduce and release of arsenic and iron and to assess the effect of microbial activity on stability of arsenic containing solid wastes. The synthetic As(V)-Fe(Ⅲ) coprecipitate slurry were inoculated with anaerobic bacteria enriched from arsenic-contaminated soil. In As(V)-Fe (Ⅲ) coprecipitate, microbial reduction of As (V) and Fe (Ⅲ) occurred, however, the release of Fe(Ⅱ) and As (Ⅲ) was not obvious. Either of them mainly exited in the solid phase. The newly formed Fe (Ⅱ)-Fe(Ⅲ) bearing minerals acted as a sink of As(Ⅲ). Coprecipitate with higher Fe/As(Fe/As=4,8,16) and CaO-neutralized can enhance the uptake of arsenic and the stability. This work may have important implications to the way of arsenic transformation and transportation in As(V)-Fe(Ⅲ)coprecipitate and safe disposal in anoxic environment.
bacterial reduction stability hydrometallurgical arsenic containing solid wastes
Rongrong Pan Yongfeng Jia Liying Xu Shaofeng Wang Xuexia Zhang
Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology,Shen Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology,Shen Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology,Shen
国际会议
哈尔滨
英文
1042-1045
2012-06-16（万方平台首次上网日期，不代表论文的发表时间）