Leaching characteristics of heavy metals in pyrolyzed municipal sewage sludge and application of solid residues in the glass-ceramic
This paper is to present a laboratory study on the leaching characteristics of heavy metals including Cu,Zn,Ni,As,Pb in pyrolyzed municipal sewage sludge and application of solid residues in the glass-ceramic.For this purpose,the municipal sewage sludge was pyrolyzed at 600℃ and the change of the total content and leaching concentration of heavy metals in the sludge and solid residues were investigated.The effect of leaching time,liquid-solid ratio and pH on the leaching concentration of heavy metals in the solid residues were studied.Pyrolyzed solid residues were used to prepare glass-ceramic and the related performances of glass-ceramic were tested.The results showed that the content of Cu,Zn,Ni,As,Pb in solid residues significantly increases,but the leaching concentration reduces respectively by 99.70%,100%,99.46%,83.93% and 39.13%.Leaching time,liquid-solid ratio and pH have a certain impact on the leaching concentration of heavy metals in the solid residues.With the increase of leaching time and liquid-solid ratio,the leaching concentration of heavy metals generally increases.But with the increase of pH,the leaching concentration of heavy metals decreases.Pyrolyzed solid residues are used to prepare glass-ceramic and the compressive strength is 170MPa,flexural strength is 38MPa,micro hardness is 5GPa,density is 2.7g/cm,all the performances meet the requirements.
Municipal sewage sludge pyrolysis heavy metal leaching glass-ceramic
Yu Li Cang Daqiang Liu Xiaoming Wang Lihua Zhang Lingling
State Key Laboratory of Advanced Metallurgy, University of Science and Technology of Beijing, Beijin State Key Laboratory of Advanced Metallurgy, University of Science and Technology of Beijing, Beijin School of Civil and Environmental Engineering, University of Science and Technology of Beijing, Beij
国际会议
上海
英文
76-76
2012-10-19（万方平台首次上网日期，不代表论文的发表时间）