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RESULTS AND DISCUSSION Influent Manure and Flush Water The barn and parlor flush water were measured using an electronic pulse flowmeter. The daily volume flowing to the solids separator ranged from 240 to 400 cubic meters per day. An inclined screen separates approximately 15% of the manure volatile solids from the liquids flowing to the lagoon. These liquids were estimated to average 300,000 liters per day at a COD of 3000 mg/liter or 3200 mg/l volatile solids (VS). Covered Lagoon Operational Parameters Two operational variables were determined for the covered lagoon digester: the organic loading rate (OLR) and the hydraulic retention time (HRT). For the 14,000-cubic meter lagoon, the average HRT was 45 days and the average ORL was 0.07 kg VS. These are well within the climatic limitations in central California of an OLR of no more than 0.16-kg VS/m3/day and an HRT of no less than 39 days. The effluent has a COD of approximately 100 to 1500 mg/l and an ammonia content of 90 mg/liter. Biogas Production Preliminary gas measurements have shown a range of 200 to 300 cubic meters of biogas-produced daily from the cover over 90% of the total lagoon surface area. The biogas has been flared and is maintaining a self-supporting flame. Preliminary measurements with a Fyrite@ combustion test kit indicate approximately 12% carbon dioxide and 88% methane by volume. Tests were conducted with a 10 KW engine-generator that was salvaged and restored from the old Poultry Unit at Cal Poly. This engine-generator set was connected to a light board to provide a load and is pictured in Figure 4 along with a Cal Poly Ag. Engineering Lab class conducting an efficiency test using biogas as fuel. The tests indicated that the gas could be successfully used in a natural gas carburetor with minor modifications. At the maximum power output of 10 KW, the biogas consumption was 11 cubic meters per hour, for and overall efficiency of 10 %. By contrast, the Microturbine specifications indicate that at a fuel consumption of 13 cubic meters of methane per hour, the output would be 28 KW, or an efficiency of 27%. The biogas quantity and quality will continue to be monitored, and the micro-turbine generator is being installed in the summer of 2001, and testing of the system will occur over the following six months. 5PDF Image | Microturbine Operation with Biogas from a Covered Dairy Manure Lagoon
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