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Co-production of clean syngas and ash adsorbent during sewage sludge gasification: Synergistic effect of Fenton peroxidation and CaO conditioning

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  • Liu, Huan
  • Yi, Linlin
  • Zhang, Qiang
  • Hu, Hongyun
  • Lu, Geng
  • Li, Aijun
  • Yao, Hong

Abstract

In order to achieve the complete utilization of both sludge organic and inorganic components, this study proposed a novel method for synchronous production of clean syngas and ash adsorbent during steam gasification process based on composite conditioning. Sewage sludge was pretreated by Fenton’s reagent (Fe2+/H2O2) and CaO, then gasified in a lab-scale fluidized bed at 873–1273K. The ash adsorption performance was also evaluated in a self-designed reactor. According to the results, both residual iron and calcium salts were able to promote H2-rich fuel gas generation. The effect of iron compounds became more strongly with temperature increased, while the influence of calcium substances tend to be more obviously with temperature decreased. Thus after combined conditioning, very good sludge gasification performance and the highest cold gas efficiency were achieved at a wide temperature range. Moreover, separate gasification of Fenton-oxidized or CaO-treated sludge released H2S emission respectively from sulfonic acid/sulfone/heterocyclic-S and inorganic sulfide in char. However, H2S releasing amount was less than 1.8% of total sulfur with the co-usage of two conditioners due to oxidation and fixation reactions. Meanwhile, although CaCxNy that formed in CaO-added sludge char reacted with steam to produce NH3, the residual iron and calcium compounds could synergistically inhibit the final emissions of NH3 and HCN. In this case, no nitrogenous gas was generated at 1273K. Besides this outstanding role, the remaining conditioners were still able to boost the adsorption performance of sludge gasification ash and significantly prolong its life.

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  • Liu, Huan & Yi, Linlin & Zhang, Qiang & Hu, Hongyun & Lu, Geng & Li, Aijun & Yao, Hong, 2016. "Co-production of clean syngas and ash adsorbent during sewage sludge gasification: Synergistic effect of Fenton peroxidation and CaO conditioning," Applied Energy, Elsevier, vol. 179(C), pages 1062-1068.
    • Handle: RePEc:eee:appene:v:179:y:2016:i:c:p:1062-1068
    DOI: 10.1016/j.apenergy.2016.07.063
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    2. Zhang, Pengchao & Hu, Hongyun & Tang, Hua & Yang, Yuhan & Liu, Huan & Lu, Qiang & Li, Xian & Worasuwannarak, Nakorn & Yao, Hong, 2019. "In-depth experimental study of pyrolysis characteristics of raw and cooking treated shrimp shell samples," Renewable Energy, Elsevier, vol. 139(C), pages 730-738.
    3. Sun, Yongqi & Chen, Jingjing & Zhang, Zuotai, 2019. "General roles of sludge ash, CaO and Al2O3 on the sludge pyrolysis toward clean utilizations," Applied Energy, Elsevier, vol. 233, pages 412-423.
    4. Carotenuto, Alberto & Di Fraia, Simona & Massarotti, Nicola & Sobek, Szymon & Uddin, M. Rakib & Vanoli, Laura & Werle, Sebastian, 2023. "Predictive modeling for energy recovery from sewage sludge gasification," Energy, Elsevier, vol. 263(PB).
    5. Yang, Xiaoxia & Gu, Shengshen & Kheradmand, Amanj & Kan, Tao & He, Jing & Strezov, Vladimir & Zou, Ruiping & Yu, Aibing & Jiang, Yijiao, 2022. "Tunable syngas production from biomass: Synergistic effect of steam, Ni–CaO catalyst, and biochar," Energy, Elsevier, vol. 254(PB).

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