Effect of temperature on bioleaching heavy metals from sewage sludge
Sewage sludge taken from Guilin Wastewater Treatment Plant (WWTP) and elemental sufur(S 0) were used as the bioleaching medium and substrate respectively. Acidification effect of sewage sludge, activity of bioleaching microorganism and removal rate of heavy metals were investigated at various temperatures from 10 ℃ to 40 ℃ in the bioleaching process. Where Bioleaching experiments were process was operated at Acidithiobacillus thiooxidans was the bioleaching dominant bacteria in the process. The results showed that acidification rate and bacterial activity increased with temperature rising in the temperature range of 10 ℃~30 ℃. The optimum temperature range for bioleaching bacteria growth was 20 ℃~30 ℃.The activity of bioleaching microorganism was the highest at 28.9 ℃ treatment requirements and low operation energy consumption, the proper temperature for bioleaching engineering application should be controlled at 20 ℃. Under this condition, the removal rates of Cu, Zn and Cd were 47.45 %、77.07 and 80.57 % respectively after 5-day bioleaching. The residual concentrations of Cu, Zn and Cd in the treated sludge met with the national standard for sludge agriculture use in China.
Hua Lin Ming Huang Haitao Huang
College of Environmental Science and Engineering Guilin University of Technology Jian-Gan Road Guili College of Environmental Science and Engineering Guilin University of Technology Jian-Gan Road Guili
国际会议
成都
英文
1-4
2010-06-18（万方平台首次上网日期，不代表论文的发表时间）