Co-Hydrothermal gasification of Chlorella vulgaris and hydrochar: The effects of waste-to-solid biofuel production and blending concentration on biogas generation. (April 2020)

• Record Type: Journal Article
• Authors: Sztancs, Greta; Juhasz, Lilla; Nagy, Balazs Jozsef; Nemeth, Aron; Selim, Asmaa; Andre, Anita; Toth, Andras Jozsef; Mizsey, Peter; Fozer, Daniel
• Is Part Of: Bioresource technology. Volume 302(2020)
• Publication Date: 2020-04
• Subjects: Co-Hydrothermal gasification -- Hydrochar -- Hydrothermal carbonization -- Biogas -- Microalgae; 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.2020.122793
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Co-Hydrothermal gasification of Chlorella v. and HC enhances biogas production. Hydrochar production is optimized using struvite containing microalgae. Hydrothermal carbonization is suitable to produce solid biofuels from wastes. HCs with different VM contents show enhanced selectivity toward H2 and CH4 in HTG. Co-Hydrothermal gasification results in increased carbon conversion ratio. Abstract: This study investigates enhanced biogas production via co-Hydrothermal gasification (co–HTG) of wet Chlorella vulgaris biomass and hydrochar (HC). Hydrothermal carbonization was applied to valorize struvite containing waste microalgae stream into solid bio-fuel with improved combustion properties. The effects of HC quality and mixing ratio are investigated on biogas yield, composition and carbon conversion ratio. The results show that the application of blending components promotes H2, CH4 formation and selectivity in hydrothermal gasification. The total co-HTG gas yield is increased from 19.13 to 46.95 mol kg - 1 at 650 °C and 300 bar by applying 5 wt% HC blending concentration and reduced level of volatile matter content (24.61 wt%). The obtained high hydrogen, methane yields and carbon conversion ratio (19.49, 2.98 mol kg - 1, 82.31%, respectively) indicate effective hydrothermal upgrading potentials in case of wet and waste biomass feedstocks.