This work presents studies on the co-combustion of sludge and wheat straw (30 wt %\nsludge + 70 wt % wheat straw). Prior to the combustion experiment, thermogravimetric analysis was\nperformed to investigate the combustion characteristic of the blended fuel. Results indicated that the\nblended fuel could remedy the defect of each individual component and also promote the combustion.\nCo-combustion experiments were conducted in a lab-scale vertical tube furnace and the ash samples\nwere analyzed by Inductively Coupled Plasma Optical Emission Spectrometer (ICP-OES), X-ray\nDiffraction (XRD), and Scanning Electron Microscope (SEM). Thermodynamic calculations were also\nmade to study the interactions that occurred. Addition of sludge could raise the melting point of\nwheat straw ash and reduce the slagging tendency. Co-combustion also restrained the release of K\nand transferred it into aluminosilicate and phosphate. Transfer of Pb and Zn in the co-combustion\nwas also studied. The release and leaching toxicity of the two heavy metals in the co-combustion\nwere weakened effectively by wheat straw. PbCl2(g) and ZnCl2(g) could be captured by K2SiO3 in\nwheat straw ash particles and generate silicates. Interactions that possibly occurred between K, Zn,\nand Pb components were discussed at the end of the paper.
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