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The Use of an Automated System (GreenFeed) to Monitor Enteric Methane and Carbon Dioxide Emissions from Ruminant Animals
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Testing a biofilter cover design to mitigate dairy effluent pond methane emissions.

Chris Pratt1, Julie Deslippe, Kevin R Tate

  • 1Landcare Research - Manaaki Whenua, Riddet Road, Palmerston North, New Zealand. C.Pratt1@massey.ac.nz

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Biofiltration effectively oxidizes methane from dairy effluent ponds. Volcanic soil biofilters showed the highest removal rates, demonstrating potential for mitigating greenhouse gas emissions.

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Area of Science:

  • Environmental Science
  • Microbiology
  • Agricultural Engineering

Background:

  • Anaerobic dairy effluent lagoons emit methane (CH4), a potent greenhouse gas.
  • Biogas production from these sources is often insufficient for energy recovery.
  • Biofiltration offers a potential strategy to oxidize CH4 using methanotrophic bacteria.

Purpose of the Study:

  • To evaluate the effectiveness of a biofilter cover design for oxidizing CH4 from simulated dairy effluent ponds.
  • To compare the performance of different substrates (volcanic pumice soil, compost, and a mixture) as biofilter media.

Main Methods:

  • Three types of biofilter substrates were tested as 5 cm covers over simulated dairy effluent.
  • Methane fluxes simulating typical dairy pond emissions were applied.
  • CH4 oxidation rates and nitrous oxide emissions were monitored over three months.

Main Results:

  • All tested substrates achieved over 95% CH4 oxidation within two months.
  • Volcanic soil biofilters demonstrated the highest CH4 removal efficiency (99%).
  • Biofilters maintained high CH4 removal rates (>90%) even when methane load was doubled.

Conclusions:

  • Biofilter cover designs are highly effective and efficient for mitigating CH4 emissions from dairy effluent ponds.
  • Volcanic soil is a promising substrate due to high CH4 oxidation and low nitrous oxide emissions.
  • Further field studies are recommended to validate these laboratory findings.