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Lagoon-Biogas Emissions and Carbon Balance Estimates of a Swine Production Facility

Tom M. DeSutter and Jay M. Ham*

Department of Agronomy, Throckmorton Hall, Kansas State University, Manhattan, KS 66506



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  		Fig. 1. Photograph of a gas-collection and ebullition-metering raft used to measure biogas flux at the lagoon.

 


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  		Fig. 2. Schematic diagram of the gas-collection and ebullition-metering system used to measure the flux of biogas from the lagoon.

 


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  		Fig. 3. Diagram of the swine facility and the sampling plan used to quantify biogas production from the 2-ha lagoon.

 


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  		Fig. 4. Annual CH4 fluxes from the middle and edge of the lagoon, and the annual liquor temperature at the bottom of the lagoon in the year 2001.

 


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  		Fig. 5. Lagoon sludge depth determined in 1999 from a three-year-old, 10500-head swine-finishing facility. Approximate locations of the waste inlet pipes are denoted with a black circle.

 


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  		Fig. 6. Gas compositional changes in the headspace of a floating chamber that initially contained 0.6 L CH4 L–1 and 0.4 L CO2 L–1.

 




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