title: Anaerobic digestion of pig and dairy manure under photo-dark fermentation condition.
abstract: Anaerobic digestion (AD) with livestock manure is a promising way for biogas production. This work presents the influence of photo-dark fermentation on biogas production of pig manure (PM) and dairy manure (DM). All sets were conducted with temperature 35 ± 2 °C and total solid concentrations 8%: PM₁ and DM₁ in transparent reactor under sunlight for photo-dark fermentation, and PM₂ and DM₂ in non-transparent reactor for dark fermentation. DM₂ had the best cumulative biogas production (CBP) of 15,447.5 mL, followed by PM₁ (15,020 mL) with stable pH and low total ammonium nitrogen (TAN) concentration (1384.99 mg/L), and DM₁ and PM₂. The CBP of DM₂ was 5.77 times as much as PM₂. The relationship between CBP and four factors including volatile fatty acid (VFA), TAN, total alkalinity and pH was analyzed. pH gained the maximum determination coefficient with the CBP among all sets and total alkalinity showed negative correlation with CBP of PM₁ and DM₁.
authors.affiliation: College of Forestry, Northwest A&F University, Yangling, Shaanxi Province 712100, China; Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province, Yangling, Shaanxi Province 712100, China.
authors.forename: Dongxue
authors.initials: D
authors.lastname: Yin
authors.affiliation: College of Forestry, Northwest A&F University, Yangling, Shaanxi Province 712100, China; Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province, Yangling, Shaanxi Province 712100, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.affiliation: Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province, Yangling, Shaanxi Province 712100, China; College of Agronomy, Northwest A&F University, Yangling, Shaanxi Province 712100, China.
authors.forename: Ningning
authors.initials: N
authors.lastname: Zhai
authors.affiliation: Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province, Yangling, Shaanxi Province 712100, China; College of Agronomy, Northwest A&F University, Yangling, Shaanxi Province 712100, China. Electronic address: ygh@nwsuaf.edu.cn.
authors.forename: Gaihe
authors.initials: G
authors.lastname: Yang
authors.affiliation: Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province, Yangling, Shaanxi Province 712100, China; College of Agronomy, Northwest A&F University, Yangling, Shaanxi Province 712100, China.
authors.forename: Xiaojiao
authors.initials: X
authors.lastname: Wang
authors.affiliation: Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province, Yangling, Shaanxi Province 712100, China; College of Agronomy, Northwest A&F University, Yangling, Shaanxi Province 712100, China.
authors.forename: Yongzhong
authors.initials: Y
authors.lastname: Feng
authors.affiliation: Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province, Yangling, Shaanxi Province 712100, China; College of Agronomy, Northwest A&F University, Yangling, Shaanxi Province 712100, China.
authors.forename: Guangxin
authors.initials: G
authors.lastname: Ren
mesh_terms: D000693:Anaerobiosis; D000818:Animals; D056804:Biofuels; D019149:Bioreactors; D002417:Cattle; D003246:Conservation of Energy Resources / Q000379:methods*; D003612:Dairying; D005285:Fermentation; D006863:Hydrogen-Ion Concentration; D008372:Manure; D013552:Swine
chemical_list: D056804:Biofuels; D008372:Manure
keywords: Anaerobic digestion; Dairy manure; Path analysis; Photo-dark fermentation; Pig manure