Characterization of food waste-recycling wastewater as biogas feedstock. (November 2015)

• Record Type: Journal Article
• Authors: Shin, Seung Gu; Han, Gyuseong; Lee, Joonyeob; Cho, Kyungjin; Jeon, Eun-Jeong; Lee, Changsoo; Hwang, Seokhwan
• Is Part Of: Bioresource technology. Volume 196(2015)
• Page Start: 200
• Page End: 208
• Publication Date: 2015-11
• Subjects: Anaerobic digestion -- Wastewater characterization -- Seasonal variation -- Acidogenesis -- Biochemical methane potential; 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.2015.07.089
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Annual and seasonal characteristics of FRW were provided. Organics in FRW mainly consisted of carbohydrate, protein, lipid, VFAs, and ethanol. Distinct seasonal changes in the wastewater characteristics were observed. Degradation of carbohydrate and protein followed first-order kinetics. An observed methanation potential of FRW was 90% of the theoretical maximum. Abstract: A set of experiments was carried out to characterize food waste-recycling wastewater (FRW) and to investigate annual and seasonal variations in composition, which is related to the process operation in different seasons. Year-round samplings ( n = 31) showed that FRW contained high chemical oxygen demand (COD; 148.7 ± 30.5 g/L) with carbohydrate (15.6%), protein (19.9%), lipid (41.6%), ethanol (14.0%), and volatile fatty acids (VFAs; 4.2%) as major constituents. FRW was partly (62%) solubilized, possibly due to partial fermentation of organics including carbohydrate. Biodegradable portions of carbohydrate and protein were estimated from acidogenesis test by first-order kinetics: 72.9 ± 4.6% and 37.7 ± 0.3%, respectively. A maximum of 50% of the initial organics were converted to three major VFAs, which were acetate, propionate, and butyrate. The methane potential was estimated as 0.562 L CH4 /g VSfeed, accounting for 90.0% of the theoretical maximum estimated by elemental analysis.