期刊
ENERGY
卷 200, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2020.117398
关键词
Fluidized bed; Pyrolysis; Sewage sludge; Char; Heavy metal
资金
- Ministry of Science and Technology of the People's Republic of China [2017YFE0124800]
Pyrolysis of sewage sludge (SS) was performed in a bench-scale fluidized bed pyrolyzer. Addition of kaolin at 850 degrees C resulted in minimum sludge char (SC) yield of 54.64 wt%. The maximum condensate yield of 17.07 wt% was obtained at 650 degrees C with Ca-bentonite addition. The H/C ratio of SC significantly decreased with increasing temperature, indicating the greater stability of high temperature SC in the soil environment. CaO obtained the largest carbon content of 12.91% in the form of carbonates, which was related to the intensive adsorption of CO2 by CaO. Meanwhile, CaO achieved prominent retention of sulfur in SC. CaO had a considerable ability to retain Cu and As at 850 degrees C and all catalysts had a good retention effect on As at 650 degrees C. X-ray diffraction (XRD) analysis implied that relatively stable ZnO and SiAs 2 in SC inhibited volatilization of Zn and As. The maximum energy yield (88.66%) of the condensate was obtained when kaolin was added, while the addition of CaO resulted in the highest energy yield (18.27%) of non-condensable gas. (C) 2020 Elsevier Ltd. All rights reserved.
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