Abstract
The improper management of goat manure from concentrated goat feeding operations and food waste leads to the emission of greenhouse gasses and water pollution in the US. The wastes were collected from the International Goat Research Center and a dining facility at Prairie View A&M University. The biochemical methane potential of these two substrates in mono and co-digestion at varied proportions was determined in triplicates and processes were evaluated using two nonlinear regression models. The experiments were conducted at 36 ± 1 °C with an inoculum to substrate ratio of 2.0. The biomethane was measured by water displacement method (pH 10:30), absorbing carbon dioxide. The cumulative yields in goat manure and food waste mono-digestions were 169.7 and 206.0 mL/gVS, respectively. Among co-digestion, 60% goat manure achieved the highest biomethane yields of 380.5 mL/gVS. The biodegradabilities of 33.5 and 65.7% were observed in goat manure and food waste mono-digestions, while 97.4% were observed in the co-digestion having 60% goat manure. The modified Gompertz model is an excellent fit in simulating the anaerobic digestion of food waste and goat manure substrates. These findings provide useful insights into the co-digestion of these substrates.
Highlights
IntroductionThe biogas produced from this process can be used for cooking, heating, and when purified can generate electricity through a gas grid power and run vehicles [2]
This study evaluated the effects of substrate characteristics on the process stability, biodegradability, digestion kinetics, and biomethane yield in mono- and co-digestions of goat manure (GM) and food waste (FW) using anaerobic batch digesters at 36 ± 1 ◦ C
The experimental findings prove that the anaerobic co-digestion of GM and FW enhances the biomethane yield compared to their mono-digestions
Summary
The biogas produced from this process can be used for cooking, heating, and when purified can generate electricity through a gas grid power and run vehicles [2]. It is a well-known technology for the treatment of solid organic wastes such as animal manure, slaughterhouse wastes and biomass for bioenergy production, and municipal solid waste (MSW) [3,4]. The management of MSW in developed countries via AD is adopted for decades [5]. The approximate composition of MSW in a developing country is 70% organic fraction, 4.16% paper and cardboard, 0.65% metals, 14.04% plastics, 1.17% glass, 3.92%
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