title: A model for methane production in anaerobic digestion of swine wastewater.
abstract: A study was conducted using a laboratory-scale anaerobic sequencing batch digester to investigate the quantitative influence of organic loading rates (OLRs) on the methane production rate during digestion of swine wastewater at temperatures between 15 °C and 35 °C. The volumetric production rate of methane (Rp) at different OLRs and temperatures was obtained. The maximum volumetric methane production rates (Rpmax) were 0.136, 0.796, 1.294, 1.527 and 1.952 LCH4 L(-1) d(-1) at corresponding organic loading rates of 1.2, 3.6, 5.6, 5.6 and 7.2 g volatile solids L(-1) d(-1), respectively, which occurred at 15, 20, 25, 30 and 35 °C, respectively. A new model was developed to describe the quantitative relationship between Rp and OLR. In addition to the maximum volumetric methane production rate (Rpmax) and the half-saturation constant (KLR) commonly used in previous models such as the modified Stover-Kincannon model and Deng model, the new model introduced a new index (KD) that denoted the speed of volumetric methane production rate approaching the maximum as a function of temperature. The new model more satisfactorily described the influence of OLR on the rate of methane production than other models as confirmed by higher determination coefficients (R(2)) (0.9717-0.9900) and lower bias between the experimental and predicted data in terms of the root mean square error and the Akaike Information Criterion. Data from other published research also validated the applicability and generality of the new kinetic model to different types of wastewater.
authors.affiliation: Biogas Institute of Ministry of Agriculture, Chengdu 610041, PR China; Laboratory of Development and Application of Rural Renewable Energy, Ministry of Agriculture, Chengdu 610041, PR China.
authors.forename: Hongnan
authors.initials: H
authors.lastname: Yang
authors.affiliation: Biogas Institute of Ministry of Agriculture, Chengdu 610041, PR China; Laboratory of Development and Application of Rural Renewable Energy, Ministry of Agriculture, Chengdu 610041, PR China. Electronic address: dengliangwei@caas.cn.
authors.forename: Liangwei
authors.initials: L
authors.lastname: Deng
authors.affiliation: Biogas Institute of Ministry of Agriculture, Chengdu 610041, PR China; Bioprocess Control AB, Scheelevägen 22, 223 63 Lund, Sweden.
authors.forename: Gangjin
authors.initials: G
authors.lastname: Liu
authors.affiliation: Biogas Institute of Ministry of Agriculture, Chengdu 610041, PR China; Laboratory of Development and Application of Rural Renewable Energy, Ministry of Agriculture, Chengdu 610041, PR China.
authors.forename: Di
authors.initials: D
authors.lastname: Yang
authors.affiliation: Biogas Institute of Ministry of Agriculture, Chengdu 610041, PR China; Laboratory of Development and Application of Rural Renewable Energy, Ministry of Agriculture, Chengdu 610041, PR China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Biogas Institute of Ministry of Agriculture, Chengdu 610041, PR China; Laboratory of Development and Application of Rural Renewable Energy, Ministry of Agriculture, Chengdu 610041, PR China.
authors.forename: Ziai
authors.initials: Z
authors.lastname: Chen
mesh_terms: D000693:Anaerobiosis; D000818:Animals; D019149:Bioreactors; D007700:Kinetics; D008697:Methane / Q000096:biosynthesis; D008962:Models, Theoretical; D013552:Swine; D062065:Wastewater
chemical_list: D008697:Methane; D062065:Wastewater
keywords: Anaerobic digestion; Model; Swine wastewater; Volumetric methane production rate