Characterization and analysis of sludge char prepared from bench-scale fluidized bed pyrolysis of sewage sludge

Yang Liu, Chunmei Ran, Azka R. Siddiqui, Asif Ali Siyal, Yongmeng Song, Jianjun Dai, Polina Chtaeva, Jie Fu, Wenya Ao, Zeyu Deng, Zhihui Jiang and Tianhao Zhang

Energy, 2020, vol. 200, issue C

Abstract: Pyrolysis of sewage sludge (SS) was performed in a bench-scale fluidized bed pyrolyzer. Addition of kaolin at 850 °C resulted in minimum sludge char (SC) yield of 54.64 wt%. The maximum condensate yield of 17.07 wt% was obtained at 650 °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 °C and all catalysts had a good retention effect on As at 650 °C. X-ray diffraction (XRD) analysis implied that relatively stable ZnO and SiAs2 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.

Keywords: Fluidized bed; Pyrolysis; Sewage sludge; Char; Heavy metal (search for similar items in EconPapers)
Date: 2020
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Citations: View citations in EconPapers (6)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:200:y:2020:i:c:s0360544220305053

DOI: 10.1016/j.energy.2020.117398

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