title: Semi-continuous anaerobic co-digestion of thickened waste activated sludge and fat, oil and grease.
abstract: Co-digestion of thickened waste activated sludge (TWAS) and fat, oil and grease (FOG) was conducted semi-continuously under mesophilic conditions. The results showed that daily methane yield at the steady state was 598L/kg VS(added) when TWAS and FOG (64% of total VS) were co-digested, which was 137% higher than that obtained from digestion of TWAS alone. The biogas composition was stabilized at a CH(4) and CO(2) content of 66.8% and 29.5%, respectively. Micronutrients added to co-digestion did not improve the biogas production and digestion stabilization. With a higher addition of FOG (74% of total VS), the digester initially failed but was slowly self-recovered; however, the methane yield was only about 50% of a healthy reactor with the same organic loading rate.
authors.affiliation: Department of Food, Agricultural, and Biological Engineering, The Ohio State University/Ohio Agricultural Research and Development Center, 1680 Madison Ave., Wooster, OH 44691-4096, USA.
authors.forename: Caixia
authors.initials: C
authors.lastname: Wan
authors.forename: Quancheng
authors.initials: Q
authors.lastname: Zhou
authors.forename: Guiming
authors.initials: G
authors.lastname: Fu
authors.forename: Yebo
authors.initials: Y
authors.lastname: Li
mesh_terms: D000693:Anaerobiosis; D056804:Biofuels / Q000032:analysis; D019149:Bioreactors; D005223:Fats / Q000378:metabolism*; D006801:Humans; D050356:Lipid Metabolism; D008697:Methane / Q000032:analysis / Q000096:biosynthesis*; D009821:Oils / Q000378:metabolism*; D012037:Refuse Disposal / Q000379:methods*; D012722:Sewage / Q000737:chemistry*
chemical_list: D056804:Biofuels; D005223:Fats; D009821:Oils; D012722:Sewage; D008697:Methane