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      Modeling temperature and moisture dependent emissions of carbon dioxide and methane from drying dairy cow manure

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          Abstract

          Greenhouse gas emissions due to biological degradation processes of animal wastes are significant sources of air pollution from agricultural areas. The major environmental controls on these microbe-induced gas fluxes are temperature and moisture content. The objective of this study was to model the effects of temperature and moisture content on emissions of CO 2 and CH 4 during the ambient drying process of dairy manure under controlled conditions. Gas emissions were continuously recorded over 15 d with paired fully automated closed dynamic chambers coupled with a Fourier Transformed Infrared gas analyzer. Water content and temperature were measured and monitored with capacitance sensors. In addition, on days 0, 3, 6, 9, 12 and 15, pH, moisture content, dissolved organic carbon and total carbon (TC) were determined. An empirical model derived from the Arrhenius equation confirmed high dependency of carbon emissions on temperature and moisture content. Results indicate that for the investigated dairy manure, 6.83% of TC was lost in the form of CO 2 and 0.047% of TC was emitted as CH 4. Neglecting the effect of temperature, the moisture contents associated with maximum gas emissions were estimated as 0.75 and 0.79 g·g −1 for CO 2 and CH 4, respectively.

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          Most cited references 22

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                Author and article information

                Contributors
                Journal
                Front. Agr. Sci. Eng.
                FASE
                CN10-1204/S
                Frontiers of Agricultural Science and Engineering
                Higher Education Press
                2095-7505
                2095-977X
                2018
                : 5
                : 2
                : 280-286
                Affiliations
                [1 ]. Institute of Resources and Environmental Sciences, School of Metallurgy, Northeastern University, Shenyang 110819, China
                [2 ]. Department of Plants, Soils and Climate, Utah State University, Logan, UT 84322, USA
                [3 ]. Department of Soil, Water and Environmental Science, The University of Arizona, Tucson, AZ 85721, USA
                Author notes
                scott.jones@usu.edu
                Article
                10.15302/J-FASE-2018215
                Categories
                RESEARCH ARTICLE

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