Weltec Biopower has successfully completed the commissioning and handover of a dairy RNG (Renewable Natural Gas/biomethane) plant in Barron County, Wisconsin. After just four months of construction, the dairy farm produces 2.36 million standard cubic meters of RNG/biomethane annually (86,600 MMBTU per year).
This RNG is processed using advanced membrane-based gas upgrading technology to deliver 272 standard cubic meters per hour (159 SCFM), which is compressed, bottled and transported to a gas grid injection point. This strongly carbon-negative RNG is drawn off the gas grid elsewhere, significantly enhancing the sustainability of the transportation fleets of the buyers.
The farm currently has a herd of 3,400 cattle, primarily Holsteins along with a select number of Swiss cows.
Weltec Biopower constructed three 6850 cubic meter (1.8m USG) duplex stainless-steel digesters for the new biomethane plant near Rice Lake. The plant is designed to process 207,000 metric tonnes of cattle manure annually (150,000 USG per day), with some flexibility to incorporate future increases in herd size.
By utilizing biomethane as a fuel source, the dairy achieves substantial environmental benefits, reducing carbon emissions by approximately 11,200 tonnes of CO2 equivalents annually.
