Tunable syngas production from two-stage sorption-enhanced steam gasification of sewage sludge

Xiaoxia Yang, Tao Kan, Amanj Kheradmand, Haimei Xu, Vladimir Strezov, Aibing Yu, Yijiao Jiang

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17 Citations (Scopus)


Syngas, a mixture of hydrogen (H2) and carbon monoxide (CO), has attracted increasing attention since it is a versatile and flexible platform feedstock for the production of value-added chemicals and fuels via Fischer-Tropsch synthesis. Syngas production from biomass gasification has been widely investigated, while the lack of tunable H2/CO ratio in the syngas limits the direct industrial application of biomass-derived syngas. By incorporation of steam gasification into the first stage of the two-stage sorption-enhanced steam gasification (SESG) of sewage sludge (SS), the H2/CO ratio of produced syngas is tunable from 0.9 to 4.7 by controlling the CaO and steam contents. The SS sample with a CaO/SS mass ratio of 3:7 produces an H2-rich gas stream (72.2 vol% purity) at the first stage (550 °C) and CO-rich gas stream (60.5 vol% purity) at the subsequent second stage (750 °C), providing a new promising approach to directly integrate the two-stage SESG of biomass with the syngas application where H2 and CO could be mixed in desirable ratios for the downstream synthesis of value-added chemicals and fuels. The high distribution of carbon and hydrogen in the tar indicates that the two-stage SESG has a great potential to promote the decomposition of tar for enhanced syngas production.

Original languageEnglish
Article number126069
Number of pages8
JournalChemical Engineering Journal
Publication statusPublished - 15 Jan 2021


  • CaO
  • Sewage sludge
  • Sorption-enhanced
  • Steam gasification
  • Tunable syngas

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