title: Biogas production performance of mesophilic and thermophilic anaerobic co-digestion with fat, oil, and grease in semi-continuous flow digesters: effects of temperature, hydraulic retention time, and organic loading rate.
abstract: Anaerobic co-digestions with fat, oil, and grease (FOG) were investigated in semi-continuous flow digesters under various operating conditions. The effects of hydraulic retention times (HRTs) of 12 and 24 days, organic loading rates (OLRs) between 1.19 and 8.97 gTVS/Ld, and digestion temperatures of 37 degrees C and 55 degrees C on biogas production were evaluated. It was proposed that, compared to anaerobic digestion with wastewater treatment plant sludge (primary raw sludge), semi-continuous flow anaerobic co-digestion with FOG could effectively enhance biogas and methane production. Thermophilic (55 degrees C) co-digestions exhibited higher biogas production and degradation of organics than mesophilic co-digestions. The best biogas production rate of 17.4 +/- 0.86 L/d and methane content 67.9 +/- 1.46% was obtained with a thermophilic co-digestion at HRT = 24 days and OLR = 2.43 +/- 0.15 g TVS/Ld. These were 32.8% and 7.10% higher than the respective values from the mesophilic co-digestion under similar operating conditions.
authors.affiliation: Department of Civil Engineering, Queen's University, Kingston, ON, Canada.
authors.forename: C
authors.initials: C
authors.lastname: Li
authors.affiliation: Department of Civil Engineering, Queen's University, Kingston, ON, Canada.
authors.forename: P
authors.initials: P
authors.lastname: Champagne
authors.affiliation: Department of Civil Engineering, Queen's University, Kingston, ON, Canada.
authors.forename: B C
authors.initials: BC
authors.lastname: Anderson
mesh_terms: D000693:Anaerobiosis; D056804:Biofuels; D019149:Bioreactors; D007220:Industrial Waste; D008697:Methane; D009821:Oils / Q000737:chemistry* / Q000378:metabolism*; D012722:Sewage; D013696:Temperature; D014865:Waste Disposal, Fluid; D062065:Wastewater / Q000737:chemistry
chemical_list: D056804:Biofuels; D007220:Industrial Waste; D008697:Methane; D009821:Oils; D012722:Sewage; D062065:Wastewater