Speciation Distribution of Heavy Metals in Pyrolysis Residue of Dewatered Sewage Sludge after Conditioned with the Composite Conditioners
GUAN Ruonan
SHI Yafei
LIANG Sha
YU Wenbo
SONG Jian
XU Xinyu
LI Chao
XIAO Jun
CHEN Ye
HU Jiukun
HE Zhong
YU Wenhao
YE Nan
WU Xu
HU Jingping
YANG Jiakuan
Abstract：The harmless treatment and energy conversion of the sewage sludge can be implemented by pyrolysis,and the understanding of speciation distribution of the heavy metals in pyrolysis residue is particularly important.The pyrolysis experiments were conducted at different temperatures (500,600,700,800 and 900 ℃),and the contents of heavy metals in raw sludge(RS)and dewatered sludge cake(FS) were studied.The concentrations of Cu,Zn,Cr,Pb and Cd in the pyrolysis residue were determined and the speciation of heavy metals was analyzed following Tessier sequential extraction procedure.An enrichment effect of heavy metals was found during the pyrolysis process.An enrichment of Cu and Zn in the pyrolysis residue was found for the raw sludge and an enrichment of Cr,Pb and Cd was found for the FS.From the chemical state analysis of the pyrolysis residue,most of the heavy metals (Cu,Zn,Cr,Pb,Cd) were presented in a more chemical stable form than those from raw sludge.
Keywords：sewage sludgepyrolysisheavy metalsenergy transformationspeciation of heavy metals
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 74-78 )