When thinking about manure management technologies and options, digesters are often the first to come to mind. But methane digesters are only part of the solution. The recovery of phosphorus, nitrogen, potassium and fiber from manure can be accomplished in a variety of ways.
Nondigester manure management practices can help to achieve California’s state climate action goals. Through California Air Resources Board (CARB), a comprehensive Short-Lived Climate Pollutant Reduction Strategy (SLCPs) is forming to reduce emissions and discover nondigester, methane-emission reduction technology options.
Newtrient, representing all U.S. dairy farmers, sent a team of technical experts to advise CARB on manure processing options for California dairy farmers and provide economically viable recommendations. Newtrient COO, Mark Stoermann, Craig Frear, Director of Research and Technology at Regenis and Curt Gooch, who represents the Dairy Environmental Systems Group at Cornell met with members of CARB’s nondigester subgroup.
“There are a lot of individual technologies and full manure processing systems that impact methane emissions. When we think about ideal technology solutions, we need to consider environmental benefits, operational benefits as well as return on investment through by-products like fertilizer, energy, heat and credits.” -Mark Stoermann, COO of Newtrient
Dairy manure holds tremendous value and has the potential to improve soil health, water quality and or air quality. While weighing the environmental benefits of different manure management systems, a farmer must also consider on-farm operational variables such as energy required for the system, production of bedding for the cows, maximizing the use of nutrients and impact on the manure storage on the farm.
Given that solutions must meet operational and environmental goals – a manure management system’s profitability is just one consideration for adoption. In order to accomplish all of the important and inseparable goals, an integrated approach to manure management systems is needed.
“We need to identify the components of these systems based on real, independent, verifiable data.” -Curt Gooch, Dairy Environmental Systems Group at Cornell
Curt Gooch and Craig Frear then provided a step-by-step approach to developing a complete manure processing system for a typical California dairy to address GHG-intensive methane, nitrogen recovery and salt removal.
“We can’t leave anything off the table. We need further support for larger nutrient-recovery efforts that may also include anaerobic digestion and other processes that can add value to the manure-derived products. Manure as a raw product opens new opportunities to reduce GHG emissions, reduce commercial fertilizer use and improve nutrient utilization to complete a circular economy” – Craig Frear
Craig Frear discussed local product opportunities and markets for manure solids and compost, as well as specialty products and markets. The Newtrient technology team then provided an overview of several non-digester technologies and systems that can contribute to significant GHG reduction and deliver dairy-derived products. These include concentration and further treatment, HTC, gasification and evaporation systems.
“If product value was sufficient alone, there would be ample incentive for the adoption of advanced manure management technologies.” – Mark Stoermann
Newtrient concluded the working session by providing six recommendations for the CARB non-digester subgroup members:
1. Provide practical funding, beyond basic research, for technology systems and products
2. Identify solutions that go beyond the farm to include the entire dairy supply chain
3. Provide long-term incentives to support technology project economics
4. Fund market-research and promotional support for manure-derived products
5. Expand product return with environmental and tax credits that support specific projects
6. Review inter-agency dairy policy to avoid conflicting policies
California is setting a high standard for the reduction of short-lived climate pollutants and Newtrient was pleased to help CARB understand that the dairy industry is able to work with them to reach these goals.