title: Characterization of food waste-recycling wastewater as biogas feedstock.
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±30.5g/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 0.562L CH4/g VSfeed, accounting for 90.0% of the theoretical maximum estimated by elemental analysis.
authors.affiliation: School of Environmental Science and Engineering, Pohang University of Science and Technology, Pohang, Gyeongbuk, South Korea.
authors.forename: Seung Gu
authors.initials: SG
authors.lastname: Shin
authors.affiliation: School of Environmental Science and Engineering, Pohang University of Science and Technology, Pohang, Gyeongbuk, South Korea.
authors.forename: Gyuseong
authors.initials: G
authors.lastname: Han
authors.affiliation: School of Environmental Science and Engineering, Pohang University of Science and Technology, Pohang, Gyeongbuk, South Korea.
authors.forename: Joonyeob
authors.initials: J
authors.lastname: Lee
authors.affiliation: Center for Water Resource Cycle Research, Korea Institute of Science and Technology, Seoul, South Korea.
authors.forename: Kyungjin
authors.initials: K
authors.lastname: Cho
authors.affiliation: Green Technology Research Center, Sudokwon Landfill Site Management Corporation, Incheon, South Korea.
authors.forename: Eun-Jeong
authors.initials: EJ
authors.lastname: Jeon
authors.affiliation: School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology, Ulsan, South Korea.
authors.forename: Changsoo
authors.initials: C
authors.lastname: Lee
authors.affiliation: School of Environmental Science and Engineering, Pohang University of Science and Technology, Pohang, Gyeongbuk, South Korea. Electronic address: shwang@postech.ac.kr.
authors.forename: Seokhwan
authors.initials: S
authors.lastname: Hwang
mesh_terms: D056804:Biofuels; D057919:Biological Oxygen Demand Analysis; D002241:Carbohydrates / Q000032:analysis; D005232:Fatty Acids, Volatile / Q000032:analysis*; D005285:Fermentation; D005502:Food; D005735:Garbage; D008697:Methane / Q000378:metabolism; D011506:Proteins / Q000032:analysis; D059027:Recycling; D012621:Seasons; D062065:Wastewater / Q000737:chemistry*
chemical_list: D056804:Biofuels; D002241:Carbohydrates; D005232:Fatty Acids, Volatile; D008697:Methane; D011506:Proteins; D062065:Wastewater
keywords: Acidogenesis; Anaerobic digestion; Biochemical methane potential; Seasonal variation; Wastewater characterization