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Ammonia and Greenhouse Gas Emissions from Constructed Wetlands Treating Swine Wastewater

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

Citation:  2007 ASAE Annual Meeting  074059.(doi:10.13031/2013.23094)
Authors:   Kyoung S Ro, Patrick G Hunt, Melvin H Johnson, Terry A Matheny, G B Reddy
Keywords:   photoacoustic multigas analyzer, closed chamber, greenhouse gas emission, ammonia, constructed wetlands

Ammonia and greenhouse gas emissions from marsh-pond-marsh constructed wetlands treating swine wastewater were measured with closed-chamber technique using a photoacoustic multigas analyzer. Theory behind the technique was discussed and the technique was demonstrated with actual field data. Nitrous oxide emission was negligible for all three constructed wetlands. Methane readings were not reliable due to the interference caused by the moisture and other short hydrocarbons in the PVC chamber headspace. Ammonia volatilization rates of different sections varied from 0.64 to 1.6 kg-N/ha/d, which compared well with the values obtained from previous wind tunnel studies. Carbon dioxide emission rates varied from 10.9 to 56.9 g/m2/d.

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