Anaerobic degradation of digestate based hydrothermal carbonization products in a continuous hybrid fixed bed anaerobic filter. (June 2021)

• Record Type: Journal Article
• Authors: Ahmed, Mostafa; Sartori, Fabio; Merzari, Fabio; Fiori, Luca; Elagroudy, Sherien; Negm, Mohamed Shaaban; Andreottola, Gianni
• Is Part Of: Bioresource technology. Volume 330(2021)
• Publication Date: 2021-06
• Subjects: Hydrothermal carbonization -- Anaerobic digestion -- Sludge management -- Wastewater digestate -- Hydrochar; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2021.124971
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: AD of digestate HTC liquor and slurry through a fixed bed anaerobic filter reactor. The reactor was operated for 300 days with increasing OLR up to 10 gCOD/L/day. Biogas production peaked at FOS/TAC ratio 0.25 while was the most stable at 0.15. No detrimental difference between the biogas production from HTC liquor and slurry. Digestate based hydrochar as supplement material for anaerobic digestion. Abstract: This study investigates the suitability of continuous hybrid fixed bed anaerobic filter reactor for treating sewage and agro-industrial digestate hydrothermal carbonization (HTC) products; hydrochar and HTC liquor (HTCL). The reactor was operated for 300 days under mesophilic conditions at different organic loading rates (OLR); maximum OLRs of 7.4 and 10 gCOD/L/d were reached while treating HTC liquor and slurry, respectively. 15 g/L hydrochar were added to the reactor as a supplement while treating HTCL solely thus increasing the biogas production up to 153%. The reactor was fed with HTCL and hydrochar with an increasing mixing ratio, and the co-digestion impact was dependent on hydrochar concentrations. The results of the study indicate that the hybrid fixed bed anaerobic filter reactor is a promising anaerobic digestion configuration for treating HTCL and overcoming the HTC upscaling challenges, and the suitability of digestate hydrochar utilization as supplement material for anaerobic digestion.