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This study investigates the production of high-quality syngas from sewage sludge and its hydrochars through gasification and catalytic gasification processes. The following types of sludge were analyzed: digested (MS1) and non-digested (MS2) municipal sludge from Silesian wastewater treatment plants (WWTPs) and two industrial sludge hydrochars (HCIS1, HCIS2). Hydrochars (HCMS1, HCMS2, HCIS1, HCIS2) were derived via hydrothermal carbonization at 200 °C and 2 h. Gasification and catalytic gasification processes with SrO were conducted under a CO 2 atmosphere at 850 °C. Gas chromatography was employed to identify syngas components, including H 2, CH 4, CO 2, and CO. The results demonstrated that the presence of a catalyst significantly increased hydrogen (H 2) yield, particularly during the heating stage. For instance, hydrogen increased from 4 % to 21. 7 % for HCMS1, although with HCMS2 no hydrogen was found until the addition of a catalyst, SrO, which increased hydrogen to 7. 6 %. The findings confirm the potential of gasification for syngas production from sewage sludge and hydrochars. • Hydrochar is potential feedstock for hydrogen production via gasification. • H 2 -rich syngas is produced from sewage sludge and hydrochars via gasification. • Catalytic gasification with SrO in CO 2 atmosphere at 850 °C boosted H 2 yield. • Presence of SrO significantly increased H 2 yield.
Sieradzka et al. (Tue,) studied this question.