Bioleaching of heavy metals from civil Sludge by Indigenous Thiobaciilus ferrooxidans
The civil sludge taken from Qilidian sewage treatment plant in Guilin was used as the cultivation medium and ferrous sulfate (FeSO<,4>.7H<,2>O) for the growth and multiplication of bioleaching microorganisms was selected as substrate in this study. Thiobacillus ferrooxidans(T. f) was dominant species in this process. Overall bioleaching procedure included two stages: acidophilus domestication and inoculated cultivation. The first stage research indicated that using fresh sludge as cultivation medium was feasible for acidophilus domestication and the essential substrate dosage was about 10g/L (m/V). The succeeding process of bioleaching was conducted in a simplified sequence bath reactor (SBR) which included three steps within one treatment period, inflow→aeration→discharge. The removal rates of high concentration heavy metals such as copper (Cu), zinc (Zn) and cadmium (Cd) could reach 78.3％, 77.7％ and nearly 99％ after 2 days running of SBR when the discharge ratio and aeration rate were controlled to 1/1.3 (about 30％ inoculum volume) and 1.5L/min respectively. Residual contents of the three elements were lower than the limit standard for sludge land application in China.
sequence bath reactor (SBR) thiobacillus ferrooxidans (T. f) heavy metal bioleaching
Ming HUANG Xue-Hong ZHANG Dun-Qiu WANG Hai-Tao HUANG Feng LI
Faculty of Urban Construction and Environmental Engineering Chongqing University Chongqing 400045 Ch Department of Resource and Environmental Engineering Guilin University of Technology Guilin 541004 C
国际会议
北京
英文
194-202
2007-08-20（万方平台首次上网日期，不代表论文的发表时间）