Anaerobic Digestion of Spoiled Maize, Lucerne and Barley Silage Mixture with and without Cow Manure: Methane Yields and Kinetic Studies

Shubham Dilip Sarode, Deepak Kumar, Divya Mathias, David McNeill and Prasad Kaparaju ()
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Shubham Dilip Sarode: School of Engineering and Built Environment, Nathan Campus, Griffith University, Brisbane, QLD 4111, Australia
Deepak Kumar: School of Engineering and Built Environment, Nathan Campus, Griffith University, Brisbane, QLD 4111, Australia
Divya Mathias: School of Engineering and Built Environment, Nathan Campus, Griffith University, Brisbane, QLD 4111, Australia
David McNeill: School of Veterinary Science, The University of Queensland, Gatton, QLD 4343, Australia
Prasad Kaparaju: School of Engineering and Built Environment, Nathan Campus, Griffith University, Brisbane, QLD 4111, Australia

Energies, 2023, vol. 16, issue 17, 1-20

Abstract: The effect of different inoculum-to-substrate ratios (ISRs) and feed mix (FM) ratios on the kinetics of methane production and yields during anaerobic digestion of spoiled silage mixture (SM) alone or co-digestion with cow manure (CM) was investigated in batch experiments at 37 °C. The silage mixture was prepared from spoiled silages of maize, lucerne and barley in equal proportions of 33% by wet weight. The effect of ISRs of 0.5, 1, 2 and 4 showed that methane yields increased with an increased ISR ratio. At ISRs of 1, 2 and 4, methane yields of 262.18 ± 14.96, 387.77 ± 14.43 and 482.23 ± 38.47 NmL CH 4 /gVS added were obtained, respectively. Incubation at ISR 0.5 resulted in low methane yields (174.49 ± 9.29 NmL CH 4 /gVS added ) due to build-up of volatile fatty acids (VFAs). Further, co-digestion of spoiled SM with CM showed that the highest methane yields of 387.77 and 382.86 NmL CH 4 /gVS added were obtained at SM:CM feed mix ratios of 100–0 and 75–25, respectively. The corresponding volatile solids (VS) removal rates were 72.80% and 70.82%, respectively. However, the best synergistic effect was noticed at a SM:CM = 50–50 feed mix ratio. Thus, this study shows that anaerobic digestion of spoiled silages is feasible and co-digestion of spoiled silage mixed with cow manure at a SM:CM feed mix ratio of 75–25 is recommended.

Keywords: anaerobic digestion; spoiled silage; biogas; co-digestion; cow manure; maize; lucerne; barley; kinetic studies; inoculum-to-substrate ratio (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: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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