Ravensdown’s EcoPond Effluent treatment system removes virtually all methane emitted from effluent ponds and, as an emerging mitigation technology, is available now.   

With methane reduction being one key area the agriculture industry must focus on to enable New Zealand to meet its climate change target for 2030 and beyond, Ravensdown in collaboration with Lincoln University is providing a solution that is available now.  

This breakthrough discovery was to target methane with an additive normally used in the treatment of drinking water.  

Ravensdown and Lincoln University collaborated in the science that underpins this new technology and Ravensdown will provide the system to dairy farmers wanting to reduce their methane emissions.   

Here is more from the scientists


Benefits of EcoPond 

  • EcoPond can reduce CH4 (Methane) emissions from the dairy effluent pond by up to 99%
  • Total phosphate leaching from treated effluent is dramatically reduced by up to 90%  and DRP (Dissolved reactive phosphate) loss into water is reduced by up to 99%
  • E.Coli in leachate/drainage water reduced by up to 99%
  • Odour significantly reduced. Ammonia gas loss reduced. Hydrogen sulphide gas loss can be reduced too 

What does EcoPond mean for farmers and our environment

How it works

Understand more about how the technology works 


Nearly all dairy farms use effluent ponds, and they are the second-largest source of on-farm methane emissions. Professor Keith Cameron of Lincoln University explains that effluent ponds are an important part of a dairy farm system in order to recycle nutrients and help meet environmental rules as set by regional councils.  

"The larger the pond, the more bacteria in the pond to generate methane and carbon dioxide. This new system has been tested in the lab and at farm scale, where it proves enormously effective at essentially nullifying the methane-creating process and halving the amount of CO2 emitted."

If all dairy were farms were to use EcoPond total dairy farm methane emissions reduction would be halfway towards the 2030 target. 

Just one of the ways Ravensdown is enabling smarter farming for a better New Zealand.

Recent research papers

Treating farm dairy effluent with poly-ferric sulphate dramatically reduces phosphorus and E. coli leaching through subsurface drains—A physical drainage model study. Xueying Che | Hong J. Di | Keith C. Cameron | Rosalind Dodd

Discovery of a new method to reduce methane emissions from farm dairy effluent. Keith C. Cameron | Hong J. Di