Evaluation of PCDD/Fs and metals emission from a circulating fluidized bed incinerator co-combusting sewage sludge with coal

作     者：Gang Zhang Jing Hai Jiang Cheng Zhiqi Cai Mingzhong Ren Sukun Zhang Jieru Zhang 

作者机构：School of Chemistry and Chemical EngineeringSouth China University of Technology South China Institute of Environmental SciencesMinistry of Environmental Protection 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2013年第25卷第1期

页      面：231-235页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

基　　金：supported by the Ministry of Environmental Protection of China (No.2011467001) the Ministry of Science and Technology of China (No.2010DFB94130) 

主　　题：co-combustion PCDD/Fs sewage sludge heavy metals 

摘      要：The emission characteristics of polychlorinated dibenzo-p-dioxins and dibenzofurans （PCDD/Fs） and heavy metals were evaluated during co-combustion of sewage sludge with coal from a circulating fluidized bed incinerator. The stack gas, slag and fly ash samples were sampled and analyzed. The gas-cleaning system consisted of electrostatic precipitators and a semi-dry scrubber. Results showed that the stack gas and fly ash exhibited mean dioxin levels of 9.4 pg I-TEQ/Nm3 and 11.65 pg I-TEQ/g, respectively, and showed great similarities in congener profiles. By contrast, the slag presented a mean dioxin level of 0.15 pg I-TEQ/g and a remarkable difference in congener profiles compared with those of the stack gas and fly ash. Co-combusting sewage sludge with coal was able to reduce PCDD/Fs emissions significantly in comparison with sewage sludge mono-combustion. The leaching levels of Hg, Pb, Cd, Ni, Cr, Cu, and As in the fly ash and slag were much lower than the limits of the environmental protection standard in China. These suggest that the co-combustion of sewage sludge and coal is an advisable treatment method from an environmental perspective.