title: Response surface optimization of methane potentials in anaerobic co-digestion of multiple substrates: dairy, chicken manure and wheat straw.
abstract: Dairy manure (DM), chicken manure (CM) and wheat straw were used to investigate the possibility of optimizing the methane (CH4) potentials in anaerobic co-digestion of multiple substrates. Response surface methodology (RSM) was used to evaluate the individual and interactive effects of four variables [carbon/nitrogen (C/N) ratio, the feeding composition (DM/CM), initial substrate loading and inoculum-to-substrate ratio (ISR)] in the digestion process. All four variables had significant effects on CH(4) potentials. Interactive effects of C/N and DM/CM ratios, C/N ratio and ISR, initial substrate loading and ISR were significant The optimum conditions were a C/N ratio of 26.31, a DM/CM ratio of 42.96:57.04, an initial loading of 15.90 g volatile solids (VS)/l and an ISR ratio of 2.34, with the maximum CH4 potential being 394 ml/g VS. The RSM model was appropriate for optimizing CH4 production in the process of anaerobic co-digestion of multiple substrates.
authors.affiliation: College of Agriculture, Northwest A&F University, Yangling, China.
authors.forename: Xiaojiao
authors.initials: X
authors.lastname: Wang
authors.forename: Gaihe
authors.initials: G
authors.lastname: Yang
authors.forename: Fang
authors.initials: F
authors.lastname: Li
authors.forename: Yongzhong
authors.initials: Y
authors.lastname: Feng
authors.forename: Guangxin
authors.initials: G
authors.lastname: Ren
mesh_terms: D000693:Anaerobiosis; D000704:Analysis of Variance; D000818:Animals; D001673:Biodegradation, Environmental; D056804:Biofuels; D002244:Carbon / Q000378:metabolism; D002417:Cattle; D002645:Chickens; D008372:Manure; D008697:Methane / Q000378:metabolism*; D008962:Models, Theoretical; D009584:Nitrogen / Q000378:metabolism; D014908:Triticum; D018505:Waste Management / Q000379:methods*
chemical_list: D056804:Biofuels; D008372:Manure; D002244:Carbon; D009584:Nitrogen; D008697:Methane