title: The effect of a buffer function on the semi-continuous anaerobic digestion.
abstract: The characteristics of the long term (90 d) anaerobic semi-continuous digestion of food wastes/animal slurry wastewater with different C/N ratio were investigated. The research demonstrates that, in the semi-continuous digestion process, different C/N ratios of substrate led to a significant effect to the characteristic of anaerobic digestion (AD). It is undoubtedly that the semi-continuous AD is efficient within a wide range of C/N ratios, and the lower C/N substrate promoted the activity of the methanogen in a long time, which maintained a stable high CH4 concentration and total organic carbon (TOC) utilization. During the whole AD process, an active buffer system was formed from NH4(+) and VFAs (by-products of TOC): this buffer system provided high concentrations of VFAs, thus increasing both the CH4 yield and TOC utilization; and also maintained a high tolerance to NH4(+) and VFAs in the system, which defusing the impact of NH4(+).
authors: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China.
authors: Qingfeng
authors: Q
authors: Wang
authors: Liyu
authors: L
authors: Peng
authors: Haijia
authors: H
authors: Su
mesh_terms: D064751:Ammonium Compounds / Q000032:analysis; D000693:Anaerobiosis; D000818:Animals; D056804:Biofuels; D002021:Buffers; D002244:Carbon / Q000032:analysis; D005232:Fatty Acids, Volatile / Q000032:analysis; D008697:Methane; D009584:Nitrogen / Q000032:analysis; D012037:Refuse Disposal / Q000379:methods*; D062611:Solid Waste / Q000032:analysis
chemical_list: D064751:Ammonium Compounds; D056804:Biofuels; D002021:Buffers; D005232:Fatty Acids, Volatile; D062611:Solid Waste; D002244:Carbon; D009584:Nitrogen; D008697:Methane