Degree Type


Date of Award


Degree Name

Doctor of Philosophy


Agricultural and Biosystems Engineering

First Advisor

Dwaine S. Bundy


The chemical analysis consists of sampling ammonia, methane, hydrogen sulfide, and carbon dioxide by Gas Chromatography/Mass Spectrometry (GC/MS). The results of the chemical-biochemical control experiment show that: (1) the chemical-bacteria additives slightly reduced the methane and carbon dioxide release, while the same additives did not show any effect on the reduction of ammonia; (2) the hydrogen sulfide contents of the swine manure continued to be low. Methane, ammonia, and carbon dioxide levels generated from stored swing manure were 3.76 and 2.2 ppm of methane, 0.35 and 0.11 ppm of ammonia, and 1000 and 470 ppm of carbon dioxide for treated and untreated manure, respectively;An emission model based on the two-film resistance theory is presented. Based on the model, the gases liquid phase resistance appears to control are nitrogen, oxygen, carbon dioxide, hydrogen sulfide, and methane, while ammonia is controlled by gas phase resistance. The average emission rate of methane, ammonia, and carbon dioxide at 15°C are 0.02, 1.52, and 0.50 g/min for untreated samples, and 0.04, 3.91, and 1.06 g/min for treated samples, respectively;A multiple airflow regions model is presented from the standpoint of the matrix method for dynamic system analysis. The model includes the local flow rate and internal mean-age of polluted air. The starting point in the model formulation is the flow matrix Q, consisting of the total flow rate between each airspace. At last, the local flow rates are also contained in the inverse flow matrix, Q[superscript](-1). The model calculation is in 3-D lumped form of control volumes representing conservation of airflow rate. The model shows that gaseous pollutant distribution is similar to the measured data from the research literature and field chamber test. The results also indicated that the mean-holding time, local mean-age, local flow-rate, and entrainment ratio of airflow can describe the dynamic behavior of gaseous pollutants in ventilated airspaces.



Digital Repository @ Iowa State University,

Copyright Owner

Chung-Min Liao



Proquest ID


File Format


File Size

196 pages