title: Comparison of the methane production potential and biodegradability of kitchen waste from different sources under mesophilic and thermophilic conditions.
abstract: The methane production potential of kitchen waste (KW) obtained from different sources was compared through mesophilic and thermophilic anaerobic digestion. The methane yields (MYs) obtained with the same KW sample under different temperatures were similar, whereas the MYs obtained with different samples differed significantly. The highest MY obtained in S7 was 54%-60% higher than the lowest MY in S3. The modified Gompertz model was utilized to simulate the methane production process. The maximum production rate of methane under thermophilic conditions was 2%-86% higher than that under mesophilic conditions. The characteristics of different KW samples were studied. In the distribution of total chemical oxygen demand, the diversity of organic compounds of KW was the most dominant factor that affected the potential MYs of KW. The effect of the C/N and C/P ratios or the concentration of metal ions was insignificant. Two typical methods to calculate the theoretical MY (TMY) were compared, the organic composition method can simulate methane production more precisely than the elemental analysis method. Significant linear correlations were found between TMYorgand MYs under mesophilic and thermophilic conditions. The organic composition method can thus be utilized as a fast technique to predict the methane production potential of KW.
authors.affiliation: Biomass Energy and Environmental Engineering Research Center, Beijing University of Chemical Technology, Beijing 100029, China E-mail: anne_wangwen@163.com.
authors.forename: Ziyi
authors.initials: Z
authors.lastname: Yang
authors.affiliation: Biomass Energy and Environmental Engineering Research Center, Beijing University of Chemical Technology, Beijing 100029, China E-mail: anne_wangwen@163.com.
authors.forename: Wen
authors.initials: W
authors.lastname: Wang
authors.affiliation: School of Banking and Finance, University of International Business and Economics, Beijing 100029, China.
authors.forename: Shuyu
authors.initials: S
authors.lastname: Zhang
authors.affiliation: China Huadian Engineering Company Limited, Beijing 100160, China.
authors.forename: Zonghu
authors.initials: Z
authors.lastname: Ma
authors.affiliation: Biomass Energy and Environmental Engineering Research Center, Beijing University of Chemical Technology, Beijing 100029, China E-mail: anne_wangwen@163.com.
authors.forename: Naveed
authors.initials: N
authors.lastname: Anwar
authors.affiliation: Biomass Energy and Environmental Engineering Research Center, Beijing University of Chemical Technology, Beijing 100029, China E-mail: anne_wangwen@163.com.
authors.forename: Guangqing
authors.initials: G
authors.lastname: Liu
authors.affiliation: Department of Biological and Agricultural Engineering, University of California, Davis, CA 95616, USA.
authors.forename: Ruihong
authors.initials: R
authors.lastname: Zhang
mesh_terms: D000693:Anaerobiosis; D001419:Bacteria / Q000378:metabolism*; D001673:Biodegradation, Environmental; D019149:Bioreactors; D008697:Methane / Q000032:analysis* / Q000378:metabolism; D008962:Models, Theoretical; D012037:Refuse Disposal; D013696:Temperature
chemical_list: D008697:Methane