Measurement and analysis of atmospheric ammonia emissions from anaerobic lagoons

Ammonia-nitrogen #ux (NH -N"(14/17)NH ) was determined from six anaerobic swine waste storage and treatment lagoons (primary, secondary, and tertiary) using the dynamic chamber system. Measurements occurred during the fall of 1998 through the early spring of 1999, and each lagoon was examined for approximately one week. Analysis of #ux variation was made with respect to lagoon surface water temperature (&15 cm below the surface), lagoon water pH, total aqueous phase NH ("NH #NH ) concentration, and total Kjeldahl nitrogen (TKN). Average lagoon temperatures (across all six lagoons) ranged from approximately 10.3 to 23.3C. The pH ranged in value from 6.8 to 8.1. Aqueous NH concentration ranged from 37 to 909mg N l , and TKN varied from 87 to 950mg N l . Fluxes were the largest at the primary lagoon in Kenansville, NC (March 1999) with an average value of 120.3 gNm min , and smallest at the tertiary lagoon in Rocky Mount, NC (November 1998) at 40.7 gNm min . Emission rates were found to be correlated with both surface lagoon water temperature and aqueous NH concentration. The NH -N #ux may be modeled as ln(NH -N #ux)"1.0788#0.0406T #0.0015([NH ]) (R "0.74), where NH -N #ux is the ammonia #ux from the lagoon surface in gNm min , T is the lagoon surface water temperature in C, and [NH ] is the total ammonia-nitrogen concentration in mgN l . 2001 Elsevier Science Ltd. All rights reserved.