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Anaerobic Digestion of Dairy Effluent in New Zealand, Time to Revisit the Idea?

Author

Listed:
  • Marianne Hull-Cantillo

    (School of Engineering, University of Waikato, Private Bag 3105, Hamilton 3240, New Zealand)

  • Mark Lay

    (School of Engineering, University of Waikato, Private Bag 3105, Hamilton 3240, New Zealand)

  • Peter Kovalsky

    (School of Engineering, University of Waikato, Private Bag 3105, Hamilton 3240, New Zealand)

Abstract

The anaerobic digestion of New Zealand low-input dairy farms has previously been evaluated for energy production, but farming systems have recently become more intensive with increased feed supplementation and feed replacement; therefore, we are studying how these changes affect the overall energy production for water heating. A combination of literature review, surveys, chemical analyses, biomethane potential analysis, and modeling were used for this study. On a case study farm with a solid separator, it was found that 558 MJ/day and 176–861 MJ/day could be produced with the solid and liquid portions of effluent, respectively. There is enough biogas to satisfy the dairy farm’s water heating requirements with a tankless water heater.

Suggested Citation

  • Marianne Hull-Cantillo & Mark Lay & Peter Kovalsky, 2023. "Anaerobic Digestion of Dairy Effluent in New Zealand, Time to Revisit the Idea?," Energies, MDPI, vol. 16(6), pages 1-17, March.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:6:p:2859-:d:1101874
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