Effects of spent liquor recirculation in hydrothermal carbonization. (February 2017)

• Record Type: Journal Article
• Authors: Kabadayi Catalkopru, Arzu; Kantarli, Ismail Cem; Yanik, Jale
• Is Part Of: Bioresource technology. Volume 226(2017)
• Page Start: 89
• Page End: 93
• Publication Date: 2017-02
• Subjects: Hydrothermal carbonization -- Hydrochar -- Recirculation -- Spent liquor; 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.2016.12.015
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Effect of the recirculation of SL was investigated depending on the biomass type. By recirculation, mass and energy yields of the hydrochar increased. Using SL decreased leaching of soluble fragments from biomass in next step hydrothermal. SL recirculation makes the hydrothermal carbonization process environmentally friendly. Abstract: In this study, the effect of the recirculation of spent liquor from hydrothermal carbonization was investigated depending on the biomass type (grape pomace, orange pomace and poultry litter). The yield and fuel properties of hydrochars and spent liquor characteristics were determined for each recirculation step. By recirculation, mass and energy yields of the hydrochar increased, but their combustion characteristics changed: the ignition temperature and combustion reactivity decreased. The organic and inorganic load of liquor was increased with recirculation number, but not as much as would be expected after the first recycle. It was concluded that the load of organic and inorganic species in spent liquor decreased the leaching of some inorganics and diffusion of the degraded soluble fragments from biomass in the subsequent hydrothermal carbonization. Overall, this study showed that spent liquor recirculation makes the overall hydrothermal carbonization process environmentally friendly.