Developing Methodology to Determine the Efficacy of Odor Reduction Technology of Liquid Fertilizer Circular Operation Technique System

NH₃ emissions from liquid waste were commonly estimated based on thin-layer models. However, such models differ in their ability to accurately reproduce observed emissions, which may be partly due to an incomplete mechanistic understanding of NH₃ volatilization. In this study, NH₃ release from pure solutions of (NH₄)₂SO₄ (AS), swine pit liquid (PL), and liquid fertilizer sample (LFS) from the liquid fertilizer operation technique system were evaluated under controlled conditions (pH 7.6 and temperature 20 °C). Relationships between the NH₃ release and pH, temperature, and total ammoniacal nitrogen (TAN) were established. Under the controlled TAN conditions, the estimation of NH₃ emission were used to determine the efficacy of odour reduction when LFS solution is flushed into the pit in swine animal feeding operations with liquid fertilizer circular operation technique system.