Waste-to-Energy RNG Digester Facility with Solar Electricity

EnTech Solutions, a leader in renewable energy and sustainable fuels, needed to upgrade an existing waste-to-energy anaerobic digester to convert dairy cattle manure into methane and reduce greenhouse gas emissions. They sought engineering, procurement, and construction (EPC) services to provide a new membrane treatment system to convert methane to renewable natural gas (RNG). In collaboration with Faith Technologies Incorporated, Mead & Hunt designed and constructed a new membrane treatment system to process biogas from three anaerobic manure digesters fed by more than 4,000 cows. The treatment system consists of H₂S scrubbing and membrane treatment for removal of CO₂ to create RNG. Solar panels and a microgrid were added to the facility to optimize RNG production at the site by reducing the fuel’s carbon intensity score. An average of 375 SCFM of RNG is loaded into tube trailers for transport to the pipeline interconnect, where it is injected into a natural gas pipeline. The facility also benefits the regional ecosystem by using advanced filtration technology to remove phosphorus from the digestate and ultimately the watershed.