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

Author

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

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.

Suggested Citation

  • Liu, Yang & Ran, Chunmei & Siddiqui, Azka R. & Siyal, Asif Ali & Song, Yongmeng & Dai, Jianjun & Chtaeva, Polina & Fu, Jie & Ao, Wenya & Deng, Zeyu & Jiang, Zhihui & Zhang, Tianhao, 2020. "Characterization and analysis of sludge char prepared from bench-scale fluidized bed pyrolysis of sewage sludge," Energy, Elsevier, vol. 200(C).
    • Handle: RePEc:eee:energy:v:200:y:2020:i:c:s0360544220305053
    DOI: 10.1016/j.energy.2020.117398
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    References listed on IDEAS

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    1. Fonts, Isabel & Gea, Gloria & Azuara, Manuel & Ábrego, Javier & Arauzo, Jesús, 2012. "Sewage sludge pyrolysis for liquid production: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(5), pages 2781-2805.
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    Cited by:

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    2. Zhou, Chunbao & Zhang, Yingwen & Liu, Yang & Deng, Zeyu & Li, Xiangtong & Wang, Long & Dai, Jianjun & Song, Yongmeng & Jiang, Zhihui & Qu, Junshen & Siyal, Asif Ali, 2021. "Co-pyrolysis of textile dyeing sludge and red wood waste in a continuously operated auger reactor under microwave irradiation," Energy, Elsevier, vol. 218(C).
    3. Wang, Chengxin & Bi, Haobo & Lin, Qizhao & Jiang, Xuedan & Jiang, Chunlong, 2020. "Co-pyrolysis of sewage sludge and rice husk by TG–FTIR–MS: Pyrolysis behavior, kinetics, and condensable/non-condensable gases characteristics," Renewable Energy, Elsevier, vol. 160(C), pages 1048-1066.
    4. Jellali, Salah & Khiari, Besma & Usman, Muhammad & Hamdi, Helmi & Charabi, Yassine & Jeguirim, Mejdi, 2021. "Sludge-derived biochars: A review on the influence of synthesis conditions on pollutants removal efficiency from wastewaters," Renewable and Sustainable Energy Reviews, Elsevier, vol. 144(C).

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