The projects listed below are currently operating co-digestion systems at Water Resource Recovery Facilities (WRRFs). The profiles represent real-world examples of projects that demonstrate the benefits of combining organic feedstocks from offsite sources to boost biogas production.You may need a PDF reader to view files on this page. See EPA’s About PDF page to learn more.
Fresno WRRF digester project profile (PDF)(1 pg, 335 K,
The Fresno/Clovis Regional Wastewater Reclamation Facility (RWRF) is located in California’s central valley. The facility co-digests a variety of agricultural and food processing wastes including Fats, Oils, and Grease (FOG), turkey blood and syrupy-type wastes. The facility produces over 500 million SCF of raw biogas per year which is used to produce electricity and generate heat to raise the temperature of the digesters.
Los Angeles County Co-Digestion Project (PDF)(1 pg, 402 K,
May 16, 2016)
The Joint Water Pollution Control Plant (Plant) is located in Carson, CA. The Plant is operated by Los Angeles County and it is the one of the largest water resource recovery facilities in the world. Wastewater solids are co-digested with food waste from restaurants, food processing plants and grocery stores. The Plant produces enough energy to power its operations.
Des Moines Metro digester project (PDF)(1 pg, 319 K,
May 16, 2016)
The Des Moines Wastewater Reclamation Facility (WRF) is located in De Moines, IA. The WRF uses biogas to fuel boilers and power internal combustion engines. The engine waste heat is recovered to heat the digesters and several facility buildings. The remaining digester gas is sold to a nearby vegetable oil refinery. The WRF processes a variety of feedstocks including Fats, Oils and Grease (FOG) and food processing wastes which has doubled their biogas production.