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METHANE RECOVERY FROM ANIMAL MANURES: THE CURRENT OPPORTUNITIES CASEBOOK some might have been forced out of livestock production. AD is sometimes the only technology that allows growth in the livestock production business. Turning a waste liability into a profit center that generates annual revenues can moderate the impacts of declining commodity prices and diversify farm income. None of the farmers surveyed with operating anaerobic digesters said that they regret their basic decisions. Most would have preferred to spend less money on design and installation, but they are unsure of exactly how costs could have been cut. Many seek new ways to increase profitability by the sales of coproducts, primarily the digested solids. They would like additional assistance in determining how best to optimize the value-added coproducts. Beating the odds, a few have met the challenge of making their systems work despite bad design or equipment. The hard knock of practical experience makes them the true superstars of farm-based AD technology in the United States. 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% FIGURE 4.2: U.S. Farm-Based Anaerobic Digester Performance 10 18 7 1 7 6 8 Not Operating Operating Mix Plug Slurry Lagoon Still, at face-value, the performance data in Figure 4.2 are not encouraging to a farmer considering whether to install an anaerobic digester as a manure treatment option. Overall, the chance for failure, i.e., having a non-operating anaerobic digester, is about 50% in the United States. However, given the fairly dismal track records of deploying other energy technologies, ranging from synthetic fuels to other renewables, this level of performance is probably no better or worse than others that received government support during the energy crises of the 1970s. 4-2PDF Image | Methane Recovery from Animal Manures The Current Opportunities Casebook
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