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Volume 14, No. 4, June 2014, Pages 1160-1167 PDF(285 KB)  
doi: 10.4209/aaqr.2013.06.0192   

The Emission Characteristics of PAHs during Coal and Sewage Sludge Co-Combustion in a Drop Tube Furnace

Wangsheng Chen1, Jun Han1,2, Linbo Qin1, Masami Furuuchi3, Hata Mitsuhiko3

1 College of Resources and Environment Engineering, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China
2 Hubei Key Laboratory of Coal Conversion and New Materials, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China
3 Graduated School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 9201192, Japan




The emission characteristics of Polycyclic Aromatic Hydrocarbons (PAHs) and their toxic equivalent (TEQ) concentrations during coal/municipal sewage sludge (MSS) co-combustion were investigated in a laboratory-scale drop tube furnace at temperatures in the range of 950–1250°C. The experimental results demonstrated that PAHs and their TEQ concentrations generated from 30/70 (MSS/Coal) co-combustion were lower than their linear calculated values. Meanwhile, the maximum reduction efficiency (46.09%) of the PAHs concentration was achieved at 1150°C. As for the TEQ concentration, the maximum reduction efficiency was as high as 57.77%. It was also observed that the PAHs concentration in flue gas during coal mono-combustion or 30/70 (MSS/Coal) co-combustion first increased and then decreased at 950–1250°C, and the maximum amount of PAHs occurred at about 1150°C. In the case of MSS monocombustion, the maximum PAHs concentration is 2.495 µg/L at 1050°C.



Keywords: Coal; Sewage sludge; Co-combustion; Drop tube furnace; PAHs.



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