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Dinitrogen Gas Collection Method for Lagoon Waste Treatment Systems

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  032248,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.14962) @2003
Authors:   Julie Larsen, John Classen, Sarah Liehr
Keywords:   Denitrification, Dinitrogen, Gas Measurement, Lagoon, Waste treatment systems

A method for collecting dinitrogen gas emissions from lagoon waste treatment systems was developed. The method was critically tested in a laboratory for sources of air contamination to ensure reliable gas measurements. The method was also tested in a laboratory to determine the significance of non-nitrogen bubbles stripping dissolved dinitrogen and influencing gas measurements. The results of these experiments revealed on average 0.57 % of N2 was contributed from air contamination and on average 3.5 % N2 contributed from nitrogen stripping in a 0.53 m water column. These results were used to estimate a dinitrogen volumetric mass transfer coefficient involved in the stripping process. This paper also includes the implementation of a simple design for applying the method for field use. The dinitrogen volumetric mass transfer coefficient was adjusted for field conditions and used to estimate the amount of dinitrogen stripped. The results reveal a positive linear relationship between the measured methane flux and the estimated rate of dissolved nitrogen stripped.

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