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

doi:10.15302/J-FASE-2018215

Front. Agr. Sci. Eng.

2018, Vol. 5

Issue (2) : 280-286 https://doi.org/10.15302/J-FASE-2018215

RESEARCH ARTICLE

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

Enzhu HU^1,², 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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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 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·g⁻¹ for CO₂ and CH₄, respectively.

Keywords carbon dioxide dairy manure methane moisture temperature

Corresponding Author(s): 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.

URL:

https://academic.hep.com.cn/fase/EN/10.15302/J-FASE-2018215
https://academic.hep.com.cn/fase/EN/Y2018/V5/I2/280

Fig.1 Sensor-based and gravimetric measurements of wet manure moisture content (M_C) (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, M_C0, as reference. Equation (9) fitted E_max 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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