A private utility wanted to produce renewable natural gas (RNG) for pipeline injection from manure feedstocks. Symbiont, now a Mead & Hunt company, served as the single point of contact for engineering, procurement, and construction (EPC) of this waste-to-energy system. Our team designed a transfer system that collects manure from two farms—with 13,000 cows combined—to a central location for anaerobic digestion. Two anaerobic digesters, 2.5 million gallons each, convert the manure waste stream into raw biogas. The biogas upgrading system consists of moisture removal, ammonia (H2S) removal in H2S polishing vessels, pressure swing adsorption (PSA) columns, and a compressor. The truck loading facility includes three bays for loading high-pressure RNG to trucks for transport to the pipeline injection point. This waste-to-energy system collects solids from multiple farms, converts 620 SCFM of biogas to RNG, and compresses it into a truck loading facility for transport to the pipeline injection point.
Key Project Aspects
Digests manure from 13,000 cows
Two 2.5-MG digesters
Generates 620 SCFM of biogas
Trucks load and transport biogas