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1.0 INTRODUCTION The total manure produced by dairy cows in the state of California is 33,000,000 tons/year. As presently handled, dairy manure produces undesirable odors, biogas, and nutrient overloads resulting in air and water pollution. California Polytechnic State University (Cal Poly) has devised a system at its dairy to capture methane, a naturally emitted manure biogas, and convert it into a usable energy source to create electric power. By incorporating a Covered Lagoon Digester System with a Microturbine Electric Generation System, manure’s undesirable byproducts can be transformed into valuable assets for a dairy farmer. If the total manure produced by dairy cows in the state of California could be converted to methane, the theoretical energy production would be 20 trillion BTU which would be enough to power a 200- megawatt power plant. At the Cal Poly dairy, about 90 percent of the manure is deposited on concrete, flushed through a solids separator, and pumped into a 14,400 cubic meter covered lagoon. As the manure is anaerobically digested by bacteria located at the bottom of the lagoon, methane is produced and is trapped underneath a floating cover, collected, and piped over to be used to fuel a 30 kW microturbine electric generator. Figure 1 shows the system that is installed at the Cal Poly dairy, and the specific information on the design and construction of the covered lagoon digester and methane collection system was discussed in detail by Williams and Frederick (2001) and Williams and Hunn (2002). 2.0 OBJECTIVES 2.1 The first objective of this paper will be to report on the baseline operating parameters of the CLDS in treating flushed dairy manure. 2.2 The second objective is to determine the operating characteristics of the 30 KW Microturbine Electric Generation System when fueled with biogas from the Covered Lagoon Digester System. 2.3 The third objective is to estimate the energy and environmental benefits of the combined systems. 3.0 PROCEDURES 3.1 BASELINE OPERATING PARAMETERS OF THE COVERED LAGOON DIGESTER 3.1.1 LAGOON DIGESTER VOLUME – Based on the length, width, and depth of the lagoon as measured in meters. 3.1.2 INFLUENT FLOW RATE – Rate of the flushed manure entering the lagoon as measured in liters. 3.1.3 HYDRAULIC RETENTION TIME – Volume of the lagoon divided by the daily influent flow as measured in days. 2PDF Image | Biogas Production From A Covered Lagoon Digester And Utilization In A Microturbine
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