title: Effect of initial total solids concentration on volatile fatty acid production from food waste during anaerobic acidification.
abstract: The effect of initial total solids (TS) concentration on volatile fatty acid (VFAs) production from food waste under mesophilic conditions (35 °C) was determined. VFAs concentration and composition, biogas production, soluble chemical oxygen demand concentration, TS and volatile solids (VS) reduction, and ammonia nitrogen [Formula: see text] release were investigated. The VFAs concentrations were 26.10, 39.68, 59.58, and 62.64 g COD/L at TS contents of 40, 70, 100, and 130 g/L, respectively. While the VFAs' yields ranged from 0.467 to 0.799 g COD/g VSfed, decreased as initial TS increased. The percentage of propionate was not affected by TS concentration, accounting for 30.19-34.86% of the total VFAs, while a higher percentage of butyrate and lower percentage of acetate was achieved at a higher TS concentration. Biogas included mainly hydrogen and carbon dioxide and the maximum hydrogen yield of 148.9 ml/g VSfed was obtained at 130 g TS/L. [Formula: see text] concentration, TS and VS reductions increased as initial TS increased. Considering the above variables, we conclude that initial TS of 100 g/L shall be the most appropriate to VFAs production.
authors: a School of Environment , Tsinghua University , Beijing 100084 , People's Republic of China.
authors: Quan
authors: Q
authors: Wang
authors: Jianguo
authors: J
authors: Jiang
authors: Yujing
authors: Y
authors: Zhang
authors: Kaimin
authors: K
authors: Li
mesh_terms: D000143:Acids / Q000737:chemistry; D001421:Bacteria, Anaerobic / Q000737:chemistry* / Q000378:metabolism*; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology*; D003470:Culture Media / Q000737:chemistry / Q000378:metabolism; D005232:Fatty Acids, Volatile / Q000096:biosynthesis* / Q000302:isolation & purification; D005735:Garbage; D006863:Hydrogen-Ion Concentration; D012037:Refuse Disposal / Q000379:methods*
chemical_list: D000143:Acids; D003470:Culture Media; D005232:Fatty Acids, Volatile
keywords: VFAs; anaerobic digestion; food waste; total solids concentration