Mass Transfer of Moisture and Ammonia From Manure and Manure Litter Mixture in Free-Stall Housing

Ikeguchi, Atsuo; Kamo, Mikio

doi:10.13031/2013.21340

Cited by 3 publications

(1 citation statement)

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“…Ikeguchi and Kamo [36] 0.0015 Ye et al [27] 0.0043 Rong et al [37] 0.0027 Saha et al [38] 0.0018 Vaddella et al [39] 0.0036 This study 0.0039 in Table 5. The average PTC was 0.0039 m s −1 , which was included in the range defined by the average k NH 3 of 0.0015-0.0043 m s −1 from different studies.…”

Section: Sourcementioning

confidence: 78%

Wind tunnel study of ammonia transfer from a manure pit fitted with a dairy cattle slatted floor

Paepe¹,

Pieters

Mendes³

et al. 2015

Environmental Technology

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In dairy cattle systems, most of the feces and urine go to the pit. At the manure pit level, mass transfer of NH3 ([Formula: see text]) has many factors, but practical difficulties hamper a controlled field evaluation. In this study, we propose a methodology for the determination of an alternative, more practical, pit transfer coefficient of NH3 (PTC), and compare it with [Formula: see text] determined from other scientific studies. The aims of this research study were: (1) to develop a wind tunnel set-up which mimics air flow patterns between the slats and above a clean section of a slatted floor section, featuring an aqueous NH3-emitting solution; and (2) to assess how air velocity, turbulence intensity, NH3 concentration ([NH3]) and PTC are influenced by inlet airflow ventilation rate (VR) forced deflection of the air above the slats into the manure pit through varying the deflection angle (DA) of a deflection panel and varying pit headspace height (HH). Main conclusions were: (1) the calculated PTC values presented a good fit to the power function of the air speed near the slats (u) (p < .001) while the average PTC (0.0039 m s(-1)) was comparable to [Formula: see text] values obtained from other studies, by remaining within the range of average values of 0.0015-0.0043 m s(-1); (2) VR and DA significantly impacted [NH3] profiles and PTC (p < .001) and (3) changing slurry pit from 0.10 to 0.90 m HH did not significantly impact [NH3] or PTC (p = .756 and p = .854, respectively).

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