title: Production of Bio-Energy from Pig Manure: A Focus on the Dynamics Change of Four Parameters under Sunlight-Dark Conditions.
abstract: This study investigated the effect of sunlight-dark conditions on volatile fatty acids (VFAs), total ammonium nitrogen (TAN), total alkalinity (TA) and pH during pig manure (PM) digestion and then the subsequent influence on biogas yield of PM. PM1 and PM2 were performed in a transparent reactor and a non-transparent reactor, respectively. Two sets of experiments were conducted with a temperature of 35.0±2.0 °C and a total solid concentration of 8.0% to the digestion material. The dynamic change of the four parameters in response to sunlight-dark conditions resulted in variations of the physiological properties in the digester and affected the cumulative biogas production (CBP). PM1 obtained higher CBP (15020.0 mL) with a more stable pH and a lower TAN concentration (1414.5 mg/L) compared to PM2 (2675.0 mL and 1670.0 mg/L, respectively). The direct path coefficients and indirect path coefficients between the four parameters and CBP were also analyzed.
authors.affiliation: College of Forestry and the Research Center of Recycle Agricultural Engineering and Technology of Shaanxi Province, Northwest A&F University, Yangling, Shaanxi, People's Republic of China.
authors.forename: Dongxue
authors.initials: D
authors.lastname: Yin
authors.affiliation: College of Forestry and the Research Center of Recycle Agricultural Engineering and Technology of Shaanxi Province, Northwest A&F University, Yangling, Shaanxi, People's Republic of China.
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.affiliation: College of Agronomy and the Research Center of Recycle Agricultural Engineering and Technology of Shaanxi Province, Northwest A&F University, Yangling, Shaanxi, People's Republic of China.
authors.forename: Ningning
authors.initials: N
authors.lastname: Zhai
authors.affiliation: College of Agronomy and the Research Center of Recycle Agricultural Engineering and Technology of Shaanxi Province, Northwest A&F University, Yangling, Shaanxi, People's Republic of China.
authors.forename: Yongzhong
authors.initials: Y
authors.lastname: Feng
authors.affiliation: College of Agronomy and the Research Center of Recycle Agricultural Engineering and Technology of Shaanxi Province, Northwest A&F University, Yangling, Shaanxi, People's Republic of China.
authors.forename: Gaihe
authors.initials: G
authors.lastname: Yang
authors.affiliation: College of Agronomy and the Research Center of Recycle Agricultural Engineering and Technology of Shaanxi Province, Northwest A&F University, Yangling, Shaanxi, People's Republic of China.
authors.forename: Xiaojiao
authors.initials: X
authors.lastname: Wang
authors.affiliation: College of Agronomy and the Research Center of Recycle Agricultural Engineering and Technology of Shaanxi Province, Northwest A&F University, Yangling, Shaanxi, People's Republic of China.
authors.forename: Xinhui
authors.initials: X
authors.lastname: Han
mesh_terms: D000818:Animals; D056804:Biofuels; D005285:Fermentation; D006863:Hydrogen-Ion Concentration; D008372:Manure; D008697:Methane / Q000032:analysis*; D013472:Sunlight; D034421:Sus scrofa
chemical_list: D056804:Biofuels; D008372:Manure; D008697:Methane