title: Dry anaerobic co-digestion of cow dung with pig manure for methane production.
abstract: The performance of dry anaerobic digestions of cow dung, pig manure, and their mixtures into different ratios were evaluated at 35 ± 1 °C in single-stage batch reactors for 63 days. The specific methane yields were 0.33, 0.37, 0.40, 0.38, 0.36, and 0.35 LCH4/gVSr for cow dung to pig manure ratios of 1:0, 4:1, 3:2, 2:3, 1:4, and 0:1, respectively, while volatile solid (VS) and chemical oxygen demand (COD) removal efficiencies were 48.59, 50.79, 53.20, 47.73, 46.10, and 44.88 % and 55.44, 57.96, 60.32, 56.96, 53.32, and 50.86 %, respectively. The experimental results demonstrated that the co-digestions resulted in 5.10-18.01 % higher methane yields, 2.03-12.95 % greater VS removals, 2.98-12.52 % greater COD degradation and so had positive synergism. The various mixtures of pig manure with cow dung might persuade a better nutrient balance and dilution of high ammonia concentration in pig manure and therefore enhanced digester performance efficiency and higher biogas yields. The dry co-digestion of 60 % cow dung and 40 % pig manure achieved the highest methane yield and the greatest organic materials removal efficiency than other mixtures and controls.
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin, 150090, the People's Republic of China, ljz6677@163.com.
authors.forename: Jianzheng
authors.initials: J
authors.lastname: Li
authors.forename: Ajay Kumar
authors.initials: AK
authors.lastname: Jha
authors.forename: Tri Ratna
authors.initials: TR
authors.lastname: Bajracharya
mesh_terms: D000693:Anaerobiosis; D000818:Animals; D001673:Biodegradation, Environmental; D056804:Biofuels; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D002417:Cattle; D005285:Fermentation; D008372:Manure; D008697:Methane / Q000096:biosynthesis*; D012722:Sewage / Q000382:microbiology; D034421:Sus scrofa
chemical_list: D056804:Biofuels; D008372:Manure; D012722:Sewage; D008697:Methane