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

Author

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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)

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.

Suggested Citation

  • Shubham Dilip Sarode & Deepak Kumar & Divya Mathias & David McNeill & Prasad Kaparaju, 2023. "Anaerobic Digestion of Spoiled Maize, Lucerne and Barley Silage Mixture with and without Cow Manure: Methane Yields and Kinetic Studies," Energies, MDPI, vol. 16(17), pages 1-20, August.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:17:p:6179-:d:1225410
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    References listed on IDEAS

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    1. Rodriguez, Cristina & Alaswad, Abed & El-Hassan, Zaki & Olabi, Abdul G., 2018. "Waste paper and macroalgae co-digestion effect on methane production," Energy, Elsevier, vol. 154(C), pages 119-125.
    2. Kaparaju, Prasad & Rintala, Jukka, 2005. "Anaerobic co-digestion of potato tuber and its industrial by-products with pig manure," Resources, Conservation & Recycling, Elsevier, vol. 43(2), pages 175-188.
    3. Egwu, Uchenna & Onyelowe, Kennedy & Tabraiz, Shamas & Johnson, Emmanuel & Mutshow, Alexander D., 2022. "Investigation of the effect of equal and unequal feeding time intervals on process stability and methane yield during anaerobic digestion grass silage," Renewable and Sustainable Energy Reviews, Elsevier, vol. 158(C).
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