The Lagoon Digester to Renewable Natural Gas projects are specifically tailored for low total solids, typically ranging from 1% to 2%. These projects make use of either an existing lagoon equipped with liner and a cover or a newly constructed lagoon suitable for dairy manure from sand lanes, swine manure, and wastewater with substantial organic loading, such as rendering wastes from a food process or municipal wastewater, with typical COD/VS Ratios of 1.5 to 1.7.
Retention times generally exceed 35 days, contingent upon ambient temperature conditions. Biogas yields typically range between 20% to 40% lower than the heated anaerobic digesters on an annual basis, varying depending on geographic location and seasonal ambient temperature fluctuations through the year. Provisions are in place to deploy feedstock heating systems during colder months, which can boost biogas yields by 20% to 30%.
The raw biogas composition and the technologies utilized for processing and conditioning biogas to RNG mirror those employed in Anaerobic Digester to RNG projects.
