MODELING AMMONIA EMISSION FROM SWINE ANAEROBIC LAGOONS

摘要: A mathematical model to estimate ammonia emission from anaerobic swine lagoons was developed based on the classical two–film theory. Inputs the are wind speed and lagoon liquid properties such as total nitrogen (TAN) concentration, pH, temperature. Predicted rates of increase when any these parameters are increased, but relationship is linear only with TAN concentration. The dissociation constant (Kd) for in lagoon liquid also an important factor, higher flux predictions Kd. validated by comparing model outputs measured fluxes two North Carolina. predicted lagoons ranged 1 38 kg NH3–N/ha–d, which a wider range than (2.5 22 N/ha–d) other researchers using micrometeorological method. Compared at each lagoon, tended predict lower fluxes B Kd 0.5 used. Additional information needed regarding values for liquid. Comparison results regression equation indicated that model predicted much temperatures above 25 ³ C upper ranges pH speed. Finally, was used typical concentration average monthly values estimated liquid temperature Raleigh, Carolina, emissions North Carolina. highest lowest occurred June January, respectively. Based the average emissions, it annual nitrogen rate surface a typical Carolina would be 234 g/m 2 or 2340 kg/ha. However, other researchers indicate can vary greatly.