Investigating the Enhancement in Biogas Production by Hydrothermal Carbonization of Organic Solid Waste and Digestate in an Inter-Stage Treatment Configuration

In recent years, sewage sludge (SS) and bio-waste management have attracted increasing environmental attention. this study, hydrothermal carbonization (HTC) technology is investigated in the framework of a co-treatment digestate (SSD) an organic fraction municipal solid waste (OW). The proposed configuration integrates HTC with anaerobic digestion (AD) inter-stage (AD1 + AD2). effects different percentages OW added to SSD treatment are evaluated terms characteristics methane yield produced liquor (HTCL) slurry (i.e., mixture hydrochar-HTCL), as well dewaterability slurry. Results show that, increase percentage OW-SSD fed process, production biogas biomethane both HTCL increases. highest achieved when consisting half used, reaching 160 ± 10 240 15 mL g−1 CODadded, respectively, for Furthermore, significantly improved by combined AD1-HTC-AD2 process. Finally, energy assessment allows estimating that can cover up 100% consumption system.