Study on Odor in Barn (II)

Mass transfer coefficients of ammonia on swine manure

Abstract

In order to measure the volume of ammonia emitted in swine house, the authors evaluated the factors that relate to the emission of ammonia from swine manure. The value of ammonia emitted from swine manure is estimated by the following equation:
m_a=α_Da·C_A·(P_a/(R_a·T))
m_a: the volume of emitted ammonia (kg/m²·h)
α_Da: the mass transfer coefficients of ammonia in swine manure (m/h)
C_A: the emission rate of ammonia in swine manure
P_a: the saturated vapor pressure of ammonia (kg/m³)
R_a: the gas constant of ammonia (m/k)
T: absolute temperature (K)
The authors evaluated mass transfer coefficient of swine manure. A replica of swine manure was made by naphthalene and set up an experimental equation for mass transfer, as a result, the mass transfer coefficient of ammonia in swine manure was within the following range:
α_Da=91-99u^0.78 (u: air velocity m/s)