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

Marianne Hull-Cantillo, Mark Lay () and Peter Kovalsky
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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

Energies, 2023, vol. 16, issue 6, 1-17

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.

Keywords: anaerobic digestion; dairy; effluent; manure; solid separation; pre-treatment; biogas; tankless water heater; New Zealand (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
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