Formation Characteristics of PCDD/Fs in the Co-combustion and Pyrolysis Process of Coal and Sewage Sludge

Abstract

Co-combustion technology of coal and sewage sludge (SS) was encouraged and recommended in China. Previous studies most focused on its influence on combustion characteristics, migration characteristics of heavy metals in fly ash, and emission of conventional pollutants, etc., but less reported the formation characteristics of polychlorinated-ρ-dibenzodioxins and dibenzofurans (PCDD/Fs). To well reveal it, this study carried out five parallel experiments, including the pyrolysis of SS, the combustion of SS, the co-combustion of coal and SS with the proportion of 0%, 2.5% and 5%, respectively. The emission concentration of PCDD/Fs respectively increased from 0.42 ng g -1 (0.0022 ng I-TEQ g -1 ) to 0.54 ng g -1 (0.0030 ng I-TEQ g -1 ) and 1.70 ng g -1 (0.0305 ng I-TEQ g -1 ) with increasing blending proportion of SS. The dominant part was also changed from PCDF (0.32 ng g -1 in M-0%, 0.38 ng g -1 in M-2.5%) to PCDD (1.11 ng g -1 in M-5%). The formation concentration of PCDD/Fs in the combustion process of SS was about 0.34 ng g -1 (0.0019 ng I-TEQ g -1 ). In the pyrolysis

Optimizing the Elimination of Dioxin-Like Compounds (PCDD/Fs and PCBs) Through Effective Combustion Practices in the Flue Gas in the Medical Waste Incineration Facility

“…Various studies such as Liu et al [8], Li et al [9], Gerasimov [10], Rao et al [11] have studied the formation of PCDD/Fs during combustion processes. These studies provide valuable insights into the formation mechanisms of PCDD/Fs, highlighting both advantages and shortcomings in formation of PCDD/Fs.…”