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METHANE RECOVERY FROM ANIMAL MANURES: THE CURRENT OPPORTUNITIES CASEBOOK Thermal energy produced by combusting biogas in an engine/generator is also recoverable. On a dairy farm, hot water is commonly used for sanitary washing throughout the entire year. Thermal energy can also be used for space heating offices and nearby buildings, as well as for other uses such as preheating livestock drinking water. Assuming that 3,750 Btu can be recovered per kWh generated and that 60% of this available energy was used during the year, 10.48 million Btu could be recovered. Excluding water vapor, the hypothetical outputs for the scenario is presented in terms of tons/year in Table 3.4 and graphically by percentage in Figure 3.3. Because of multiple rounding errors, about 4 more tons of output is created than was input annually, an error of 0.04%. TABLE 3.4: Plug-Flow Digester Hypothetical Outputs (Tons/Year) Methane Carbon Dioxide Grit Fiber Filtrate TOTAL 182 302 103 1,422 8,215 10,224 FIGURE 3.3: Hypothetical Dairy Farm Plug-Flow Digester Outputsby Percent Filtrate 80.4% Fiber Grit CO2 CH4 13.9% 1.0% 3.0% 1.8% 3-11PDF Image | Methane Recovery from Animal Manures The Current Opportunities Casebook
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