Emission characteristics for co-combustion of leather wastes, sewage sludge, and coal in a laboratory-scale entrained flow tube furnace
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Four different mixed fuels consisted of leather waste, coal, and sewage sludge were combusted in a lab-scale entrained flow fluidized bed furnace. The influence of blending ratio on emission characteristics of SO2, NOx, HCl, particulate matter (PM), heavy metals, and polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) was studied. Results showed that the mixing of coal with sewage sludge had a complex effect on the emission characteristics. On the one hand, with more sewage sludge blending in the mixed fuel, the acid gas pollutant (SO2, NOx) decreased a lot, and the recovery of volatile heavy metals (Cd, Pb) increased at the same time. Furthermore, the leaching toxicity of Cr in the fly ash and bottom ash went down below the national standard with the adding of sewage sludge. On the other hand, the mixing of sewage sludge which consisted of more ash content resulted in the increase of the PM emission. Moreover, the high content of Cu and chlorine in the sewage sludge can promote the formation of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) when the fuel 3 and 4 were combusted. Most importantly, the concentration of toxic PCDD/Fs in the flue gas produced from fuel 3 and fuel 4 was successfully controlled down below 0.20 ng I-TEQ/Nm3 by the active carbon.
KeywordsCo-combustion Heavy metals PCDD/Fs Sewage sludge Leather waste Coal
This research was supported by the National Natural Science Foundation of China (NSFC 51806205).
- Brown EM, Taylor MM, Marmer WN (1996) Production and potential uses of co-products from solid tannery waste. J Am Leather Chem Assoc 91(10):270–276Google Scholar
- Ding W, Zhou J, Liao X, Shi B (2012) Review for dechromization methods of chromium-containing leather waste. China LeatherGoogle Scholar
- Doolittle C, Woodhull J, Venkatesh M (2002) Managing emissions during hazardous-waste combustion. Chem Eng 109(13):50–57Google Scholar
- Duan F, Cong S, Shuang W, Shi Z (2012) Co-combustion characteristics of municipal sewage sludge and different bituminous coals. Chin J Environ Eng 6(8):2865–2869Google Scholar
- Imai T, Okmura H (1991) Studies on incineration of chrome leather waste. J Am Leather Chem Assoc 86(8):281–294Google Scholar
- Lin W, Mu C, Zhang M 2002. Conversion of solid leather waste to reusable resources (III) chromium containing leather wastes and its application in leather chemicals. China LeatherGoogle Scholar
- Muralidhara HS (1982) Recovery of potential energy and chromium values from leather tannery wastes, USGoogle Scholar
- USEPA (ed) (1994) Method 1613B: tetra through octa- chlorinated dioxins and furans by isotype dilution HRGC/HRMS. U.S. EPA Press, Washington, DCGoogle Scholar
- USEPA (1995) Method 23. Determination of polychlorinated dibenzo-pdioxins and polychlorinated dibenzofurans from municipal waste combustors. U.S. EPAGoogle Scholar