Characterization of atmospheric ammonia emissions from swine waste storage and treatment lagoons

Fluxes of atmospheric ammonia-nitrogen (NH3-N, where NH3-N 5 (14/17)NH3) from an anaerobic ;2.5 ha (1 ha 5 10,000 m 2 ) commercial hog waste storage lagoon were measured during the summer of 1997 through the spring of 1998 in order to study the seasonal variability in emissions of NH3-N and its relationship to lagoon physicochemical properties. Ammonia-nitrogen fluxes were measured during each season (summer, fall, winter, and spring) using a dynamic flow through chamber system. Measured lagoon physicochemical parameters included surface lagoon temperature (T,8C, ;15 cm below surface), lagoon pH, and Total Kjeldahl Nitrogen (TKN). The pH and TKN of the surface lagoon water ranged from 7 to 8 pH units, and 500 to 750 mg N L 21 , respectively. The largest fluxes were observed during the summer (August 1997) (mean NH3-N flux 5 4017 6 987 m gNm 22 min 21 ). Fluxes decreased through the fall (December 1997) months (844 6 401 m gNm 22 min 21 ) to a minimum flux during the winter (February 1998) months (305 6 154 m gNm 22 min 21 ). Emission rates increased during spring (May 1998) (1706 6 552 m gNm 22 min 21 ), but did not reach the magnitude of fluxes observed during the summer. Lagoon emissions in eastern North Carolina were estimated to constitute ;33% of total NH3-N emissions from commercial hog operations in North Carolina based on current inventories for NH3-N emissions published by the North Carolina Division of Air Quality, North Carolina Department of Environment and Natural Resources. The ammonia flux may be predicted by an observational model log10 (NH3-N flux) 5 0.048 T, 1 2.1.

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