Methane and Hydrogen Sulfide Production from Co-Digestion of Gummy Waste with a Food Waste, Grease Waste, and Dairy Manure Mixture

Abhinav Choudhury and Stephanie Lansing
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Abhinav Choudhury: Department of Environmental Science and Technology, University of Maryland, University of Maryland Energy Research Center, 1429 Animal Science/Ag Engineering Bldg., College Park, MD 20742, USA
Stephanie Lansing: Department of Environmental Science and Technology, University of Maryland, University of Maryland Energy Research Center, 1429 Animal Science/Ag Engineering Bldg., College Park, MD 20742, USA

Energies, 2019, vol. 12, issue 23, 1-12

Abstract: Co-digestion of dairy manure with waste organic substrates has been shown to increase the methane (CH 4 ) yield of farm-scale anaerobic digestion (AD). A gummy vitamin waste (GVW) product was evaluated as an AD co-digestion substrate using batch AD testing. The GVW product was added at four inclusion levels (0%, 5%, 9%, and 23% on a wet mass basis) to a co-digestion substrate mixture of dairy manure (DM), food-waste (FW), and grease-waste (GW) and compared to mono-digestion of the GVW, DM, FW, and GW substrates. All GVW co-digestion treatments significantly increased CH 4 yield by 126–151% (336–374 mL CH 4 /g volatile solids (VS)) compared to DM-only treatment (149 mL CH 4 /g VS). The GVW co-digestion treatments also significantly decreased the hydrogen sulfide (H 2 S) content in the biogas by 66–83% (35.1–71.9 mL H 2 S/kg VS) compared to DM-only (212 mL H 2 S/kg VS) due to the low sulfur (S) content in GVW waste. The study showed that GVW is a potentially valuable co-digestion substrate for dairy manure. The high density of VS and low moisture and S content of GVW resulted in higher CH 4 yields and lower H 2 S concentrations, which could be economically beneficial for dairy farmers.

Keywords: biochemical methane potential; biogas; anaerobic digestion (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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