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METHANE RECOVERY FROM ANIMAL MANURES: THE CURRENT OPPORTUNITIES CASEBOOK The use of the AD process for treating industrial wastewaters has grown tremendously during the past decade. Worldwide, more than 1,000 vendor-supplied systems now operate or are under construction. It is estimated that European plants comprise 44% of the installed base. Only 14% of the systems are located in North America. A considerable number of the systems are located in South America, primarily Brazil, where they are used to treat the vinasse coproduct from sugar cane-based 7 ethanol production. A digester treating dilute wastewater at a fuel ethanol production plant in Brazil (photo credit: Paques BV) More than 35 example industries that use digesters have been identified, including processors of chemicals, fiber, food, meat, milk, and pharmaceuticals. Many use AD as a pretreatment step that lowers sludge disposal costs, controls odors, and reduces the costs of final treatment at a municipal wastewater treatment facility. From the perspective of the municipal facility, pretreatment effectively expands treatment capacity. This MSW digester has operated continuously since 1988 (photo credit: Krijn Braber, NOVEM) Although the first digester to use MSW as a feedstock operated in the United States from 1939-1974, it is receiving renewed interest. MSW processing facilities have made significant progress towards commercial use in recent years, with several in operation for more than 15 years. A number of types of systems have been developed; each has its own special benefits. Processes such as AD and composting offer the only biological route for recycling matter and nutrients from the organic fraction of MSW. Composting is an energy-consuming process, requiring 50-75 kWh of electricity per ton of 7 Lettinga, G.; Van Haandel, A. (1992). “Anaerobic Digestion for Energy Production and Environmental Protection.” Chapter 19 in Renewable Energy: Sources for Fuels and Electricity. Covelo, CA: Island Press. pp. 817-839. 2-4PDF Image | Methane Recovery from Animal Manures The Current Opportunities Casebook
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