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Frontiers of Agricultural Science and Engineering

Front. Agr. Sci. Eng.    2018, Vol. 5 Issue (2) : 280-286
Modeling temperature and moisture dependent emissions of carbon dioxide and methane from drying dairy cow manure
Enzhu HU1,2, Pakorn SUTITARNNONTR2, Markus TULLER3, Scott B. JONES2()
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
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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 CO2 and CH4 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 CO2 and 0.047% of TC was emitted as CH4. Neglecting the effect of temperature, the moisture contents associated with maximum gas emissions were estimated as 0.75 and 0.79 g·g1 for CO2 and CH4, respectively.

Keywords carbon dioxide      dairy manure      methane      moisture      temperature     
Corresponding Authors: Scott B. JONES   
Just Accepted Date: 15 March 2018   Online First Date: 23 April 2018    Issue Date: 28 May 2018
 Cite this article:   
Enzhu HU,Pakorn SUTITARNNONTR,Markus TULLER, et al. Modeling temperature and moisture dependent emissions of carbon dioxide and methane from drying dairy cow manure[J]. Front. Agr. Sci. Eng. , 2018, 5(2): 280-286.
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Enzhu HU
Scott B. JONES
Fig.1  Sensor-based and gravimetric measurements of wet manure moisture content (MC) (a), temperature (T) (b), fluxes of CO2 (c) and CH4 (d) during the ambient drying process of dairy manure
Fig.2  Two dimensional fitted surface describing the temperature and moisture dependence of CO2 (a) and CH4 (b) gas fluxes from dairy manure
Fig.3  Cumulative losses of CO2 and CH4 as a function of decreasing moisture content during the drying process of dairy manure. Differences were computed based on the initial moisture content, MC0, as reference. Equation (9) fitted Emax values for CO2 (10.3 mol·m-2) and CH4 (0.0713 mol·m-2) represent an estimate of the total gas loss over the manure drying process (i.e., beyond 15 d).
Fig.4  Changes in pH during the ambient drying process of dairy manure
Fig.5  Changes of DOC, TC and DOC/TC during the ambient drying process of dairy manure. The subscript DM refers to dry matter.
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