Simulation on speciation transformation of heavy metals in the sewage sludge during pyrolysis
Abstract：Carbonates, soluble salts and sulfides of Cd, Cu,Zn and Pb were used as model com- pounds in sewage sludge, which were pyrolyzed together with sewage sludge under different conditions. The pyrolysis products of the model compounds were analysed by a X-ray diffrac- tion(XRD) to investigate the speciation transformation mechanism of the heavy metals. The results show that the cadmium carbonate transforms into CdS which is more stable. The car- bonate and sulfide of copper form Cu2S. The exchangeable state of Zn, carbonates and ex- changeable state of Pb produce corresponding oxides and sulfides during pyrolysis.
Keywords：sewage sludgepyrolysisheavy metalsspeciation
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 959-963 )