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METHANE RECOVERY FROM ANIMAL MANURES: THE CURRENT OPPORTUNITIES CASEBOOK 12.0 10.0 8.0 6.0 4.0 2.0 35.0 30.0 25.0 20.0 15.0 10.0 5.0 FIGURE3.1: SensitivityofIRRandSPPtoElectricityRate for Base Water Usage Swine Farm Covered Lagoon Digester with Heat Recovery 0.0 0.0 SPP cents per kWh IRR 14.25% Hurdle Rate 3.1.3 Reduced Water Usage Cost and Energy Estimates As shown earlier, the base water usage by the farm’s waste management system incorporates a conventional anaerobic lagoon supplied by a system that cycles 12 times daily, producing a total flush volume of 312,480 gal of water with a 0.3% TS concentration. One observation is that other swine farms successfully operate with far fewer daily flushing cycles without compromising animal health or worker safety. Many farms flush four to six times daily, some flush infrequently as twice per day. All other things being held equal, fewer daily flushing cycles would allow a smaller, less costly, covered lagoon digestion system to be installed. The net impact should be an increase in cost- effectiveness. The purpose here is to illustrate the impacts of reduced water usage on the economic performance of the digestion system. Thus, except for reducing the number of daily flushing cycles from 12 to 8 (i.e., flushing every 3 hours instead of every 2 hours), all the other inputs previously used remained constant. This would provide a flush volume of 208,320 gal/day, giving a 0.45% TS concentration. Using these variables and, once again, the other implicit assumptions found in the FarmWare program indicated that the total lagoon volume would be reduced from 2.02 to 1.40 million ft3. Still assuming a depth of 24 feet, the linear surface dimensions were estimated to be 299 x 299 ft, presenting a total surface area of 89,401 ft2 to be covered. FarmWare estimated that the digester would, on average, produce 32,429 ft3 of methane per day. The program still estimated that this would be sufficient to fuel an engine/generator of 113-kW. 3-7 Simple Payback Period (years Internal Rate of Return (%) 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0PDF Image | Methane Recovery from Animal Manures The Current Opportunities Casebook
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