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According to Professor William Douglas (2003), “the total manure produced by dairy cows in the state of California is 33,000,000 tons/year. As presently handled, dairy manure produces undesirable odors, biogas, and nutrient overloads resulting in air and water pollution. If the total manure produced by dairy cows in the state of California could be converted to methane, the theoretical energy production would be 20 trillion BTU which would be enough to power a 200 megawatt power plant.”
Assessment of Methane Capture and Use from the Intensive Livestock Industry, Sept 2007, Rural Industries Research and Development Corporation, Australia.
An Evaluation of a Covered Anaerobic Lagoon For Flushed Dairy Cattle Manure Stabilization and Biogas Production, June 2008, AgSTAR Program, US Environmental Protection Agency.
Biomethane from Dairy Waste: A Sourcebook for the Production and Use of Renewable Natural Gas in Claifornia, July 2005, Ken Krich Research Manager, Prepared for Western United Dairymen.
Biogas Production From a Covered Lagoon Digester and Utilization in Microturbine, 2003? Douglas Williams and Diana Gould-Wells, California Polytechnic State University.
Covered Anaerobic Ponds for Anaerobic Digestion and Biogas Capture: Piggeries, Nov 2008, NWA Information Series, New ZealandPork.
Dairy Shed Effluent and Biogas – Frequently Asked Questions, September 2012, Dairy Australia, Southbank Victoria, Australia.
Development of a Methane Conversion Factor for Estimate from Animal Waste Lagoons, 2003?, Joesph Mamgino, Deborah Bartram and Amy Brazy, United States.
Managing Swine Manure in Utah, March 2014, Orchard. B., BioCycle.net, The Organics Recyling Authority.
Methane Recovery and use at Grantham Piggery, December 2012, Rural Industries Research and Development Corporation, Austrlian Government, Australia.
Waste Stabilisation Pond: Design Manual, Dec 2011, Power and Water, Northern Territory, Australia.