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Hydrogen-rich bio-gas generation and optimization in relation to heavy metals immobilization during Pd-catalyzed supercritical water gasification of sludge

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  • Lin, Junhao
  • Sun, Shichang
  • Cui, Chongwei
  • Ma, Rui
  • Fang, Lin
  • Zhang, Peixin
  • Quan, Zonggang
  • Song, Xin
  • Yan, Jianglong
  • Luo, Juan

Abstract

This study aimed to investigate the relationship between the immobilization efficiency of heavy metals (HMs) and the generation of bio-gas under different catalyzing conditions during the supercritical water gasification of sludge. Results showed that catalysts could promote the decomposition of organic matters to improve the yield of bio-gas and the order of the catalysts in terms of H2 selectivity was Pd > CaO > AlCl3. Pd catalyst not only promoted the generation of hydrogen-rich bio-gas but also enhanced the immobilization efficiency of HMs. This was because the Pd catalyst facilitate the steam reforming reaction of the high-molecular-weight organic matters while promoting the combination of HMs with mineral components to form stable crystalline compounds. When the addition amount of Pd catalyst was 10 wt %, the yield of hydrogen-rich bio-gas increased from 35.74 wt% to 46.88 wt%, and the leaching concentration of Zn, Cu, and Cr decreased significantly to 1.22 mg/L, 0.55 mg/L and 0.38 mg/L, respectively. In addition, rational adjustment of addition amount of catalyst could optimize the specific surface area of the bio-char to enhance the physical adsorption of HMs via affecting the process of bio-gas generation.

Suggested Citation

  • Lin, Junhao & Sun, Shichang & Cui, Chongwei & Ma, Rui & Fang, Lin & Zhang, Peixin & Quan, Zonggang & Song, Xin & Yan, Jianglong & Luo, Juan, 2019. "Hydrogen-rich bio-gas generation and optimization in relation to heavy metals immobilization during Pd-catalyzed supercritical water gasification of sludge," Energy, Elsevier, vol. 189(C).
    • Handle: RePEc:eee:energy:v:189:y:2019:i:c:s0360544219319917
    DOI: 10.1016/j.energy.2019.116296
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