Bio-hydrolysis and bio-hydrogen production from food waste by thermophilic and hyperthermophilic anaerobic process. (September 2016)

• Record Type: Journal Article
• Authors: Algapani, Dalal E.; Qiao, Wei; Su, Min; di Pumpo, Francesca; Wandera, Simon M.; Adani, Fabrizio; Dong, Renjie
• Is Part Of: Bioresource technology. Volume 216(2016)
• Page Start: 768
• Page End: 777
• Publication Date: 2016-09
• Subjects: Food waste -- Bio-hydrolysis -- Bio-hydrogen -- Thermophilic -- Hyperthermophilic; 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.2016.06.016
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Thermophilic is more advantageous than the hyperthermophilic to pretreat FW. Long-term and stable H2 production was established in thermophilic CSTR. Process kinetics of both temperatures were obtained. Rate-limiting step in pretreatments was determined. Abstract: High-temperature pretreatment plays a key role in the anaerobic digestion of food waste (FW). However, the suitable temperature is not yet determined. In this work, a long-term experiment was conducted to compare hydrolysis, acidogenesis, acetogenesis, and hydrogen production at 55 °C and 70 °C, using real FW in CSTR reactors. The results obtained indicated that acidification was the rate-limiting step at both temperatures with similar process kinetics characterizations. However, the thermophilic pretreatment was more advantageous than the hyperthermophilic with suspended solids solubilization of 47.7% and 29.5% and total VFA vs. soluble COD ratio of 15.2% and 4.9%, for thermophilic and hyperthermophilic treatment, respectively, with a hydrolytic reaction time (HRT) of 10 days and an OLR of 14 kg COD/m 3 d. Moreover, stable hydrogen yield (70.7 ml-H2 /g VSin ) and content in off gas (58.6%) was achieved at HRT 5 days, pH 5.5, and temperature of 55 °C, as opposed to 70 °C.