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Sorption-enhanced thermochemical conversion of sewage sludge to syngas with intensified carbon utilization

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  • Yang, Xiaoxia
  • Tian, Sicong
  • Kan, Tao
  • Zhu, Yuxiang
  • Xu, Honghui
  • Strezov, Vladimir
  • Nelson, Peter
  • Jiang, Yijiao

Abstract

Efficient transformation of sewage sludge into bioenergy is currently a promising option to combat the energy crisis and mitigate climate change. Most attention has been paid to thermochemical H2 production, however, effective approaches to utilize the carbon in sludge are lacking. Here we propose a novel two-stage sorption-enhanced thermochemical conversion process, which relies on the integration of a CaO-based CO2 carrying cycle, to intensify the utilization of sludge carbon. In the process, the CO2 generated during sludge pyrolysis at the first stage is captured and stored in the form of CaCO3, and is then released at higher temperatures (the second stage) to gasify the sludge char for CO production. Under the conditions investigated in this study, the proposed process could produce 284.7 NmL of syngas per gram of dry sludge with a gross CO/H2 molar ratio of 2.3, via obtaining a H2-rich gas stream at 550 °C and a CO-rich gas stream at 750 °C, respectively. We conclude that the proposed process offers an efficient option for the production of syngas from sewage sludge with significantly intensified carbon utilization.

Suggested Citation

  • Yang, Xiaoxia & Tian, Sicong & Kan, Tao & Zhu, Yuxiang & Xu, Honghui & Strezov, Vladimir & Nelson, Peter & Jiang, Yijiao, 2019. "Sorption-enhanced thermochemical conversion of sewage sludge to syngas with intensified carbon utilization," Applied Energy, Elsevier, vol. 254(C).
    • Handle: RePEc:eee:appene:v:254:y:2019:i:c:s0306261919313509
    DOI: 10.1016/j.apenergy.2019.113663
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    1. Osat, Mohammad & Shojaati, Faryar & Osat, Mojtaba, 2023. "A solar-biomass system associated with CO2 capture, power generation and waste heat recovery for syngas production from rice straw and microalgae: Technological, energy, exergy, exergoeconomic and env," Applied Energy, Elsevier, vol. 340(C).
    2. Kong, Ge & Zhang, Xin & Wang, Kejie & Zhou, Linling & Wang, Jin & Zhang, Xuesong & Han, Lujia, 2023. "Tunable H2/CO syngas production from co-gasification integrated with steam reforming of sewage sludge and agricultural biomass: A experimental study," Applied Energy, Elsevier, vol. 342(C).
    3. Yan, Xianyao & Li, Yingjie & Sun, Chaoying & Zhang, Chunxiao & Yang, Liguo & Fan, Xiaoxu & Chu, Leizhe, 2022. "Enhanced H2 production from steam gasification of biomass by red mud-doped Ca-Al-Ce bi-functional material," Applied Energy, Elsevier, vol. 312(C).
    4. 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).
    5. Xu, T.X. & Tian, X.K. & Khosa, A.A. & Yan, J. & Ye, Q. & Zhao, C.Y., 2021. "Reaction performance of CaCO3/CaO thermochemical energy storage with TiO2 dopant and experimental study in a fixed-bed reactor," Energy, Elsevier, vol. 236(C).

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