Anaerobic co-digestion of animal manure at different waste cooking oil concentrations

Abstract

This study aimed to obtain the best dose of waste cooking oil inclusion for the co-digestion of substrates prepared with dairy cattle and swine manure in order to maximize solids reductions and biogas yield. Analyses of total solids (TS), volatile solids (VS), and neutral detergent fiber (NDF) were performed during the loading and unloading of digesters, while biogas yield was measured twice a week. The maximum reduction in VS (51.4%) was reached with the inclusion of up to 54.6g waste cooking oil.kg manure-1. Maximum NDF degradation occurred with inclusions of up to 69.4g waste cooking oil.kg manure-1. Inclusions of up to 64g of waste cooking oil.kg manure-1 provided specific biogas yield of 291.4 and 251.0L biogas.kg VS-1 added to substrates with swine and cattle manure, respectively. Adding oil at doses between 45.1 and 69.4g waste cooking oil kg manure-1 to substrates composed of cattle or swine manure maximizes reductions of solids and fibrous constituents and enhances specific biogas yield. Furthermore, swine manure supports higher doses of waste cooking oil.

Waste to Energy Potential of Domestic Waste Cooking Oil in Guayaquil: A review.

“…The anaerobic co-digestion offers great potential for the proper disposal of the organic fraction of solid domestic waste and it can be defined as the simultaneous treatment of two or more organic biodegradable waste streams by anaerobic digestion [50]. For instance, Da Silva et al [51], combined swine manure with waste cooking oil in a proportion of 45.6 to 66.7 waste cooking oil/kg manure, obtaining better values than just swine manure. Sandriaty et al [52], determined the effect of WCO into co-digestion process of food waste to produce biogas, being the result a methane yield of 485 mL CH4/gr Volatile Solids.…”

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“…According to this, few studies have evaluated the potential for biogas production and the composition of the same from waste of animals fed diets supplemented with monensin (WILDENAUER et al, 1984) or different sources of fatty acids (KÜLLING et al, 2002). Cirne et al (2007); Gonçalves et al (2012) and Sunada et al (2018) have evaluated the potential of lipids in the form of oil residues as a substrate directly mixed with bovine waste to supply biodigesters. According to Hunter Long et al (2012), the use of lipid residues has been identified as a strategy to expand biogas yield by 30% or more.…”