Bioleaching of heavy metals from civil Sludge by Indigenous Thiobacillus ferroozidans
The civil sludge taken from Qilidian sewage treatment plant of Guilin was used as the cultivation medium and ferrous sulfate (FeSO4.7H2O) was substrate for the growth of bioleaching microorganisms in this research. Through strength environment of bacterial, the indigenous Thiobacillus ferrooxidans(T.f)in fresh sludge was propagated greatly and become the dominant species in this process. Overall the bioleaching procedure included two stages: acidophilus domestication and inoculated cultivation. The first stage research indicated that 10g/L was the lowest substrate dosage to keep bacterial growing and sludge effective acidification. The second process of bioleaching was conducted in the sequence bath reactor (SBR) with a simplified operation process. The removal rates of high concentration heavy metals of Cu, Zn and Cd could reach 78.3％,77.7％ and nearly 99％ respectively after 2 days running of SBR. The discharge ratio and aeration rate of SBR were controlled to 10/13(30％ inoculums volume) and 1.0L/min.L. Residual contents of the three elements were lower than the limit standard for sludge land application in China.
sequence bath reactor Thiobacillus ferroozidans(T.f) heavy metal bioleaching
Ming Huang Qiang He Li-Wei Xu Ming Huang Xue-Hong Zhang Cheng-Wei Zhao Xue-Hong Zhang Qiang He
Faculty of Urban Construction and Environmental Engineering Chongqing University Chongqing,China Department of Resource and Environmental Engineering Guilin University of Technology Guilin,China The Guangxi Key Laboratory of Environmental Engineering,Protection and Assessment Guilin,China
国际会议
北京
英文
1-4
2009-06-11（万方平台首次上网日期，不代表论文的发表时间）