A Computer Model for Predicting Ammonia Release Rates from Swine Manure Pits

Zhang, R.H.; Day, D. L.; Christianson, Laura E.; Jepson, William Paul

doi:10.1006/jaer.1994.1052

Cited by 64 publications

(34 citation statements)

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“…Agricultural activities, animal husbandry, in particular, contribute the main NH 3 emission worldwide. Dairy cattle production systems account for ϳ12% of the total yearly global NH 3 emissions. In addition, dairies are one of the major emission sources in the livestock sector.…”

Section: Ammonia (Nhmentioning

confidence: 99%

“…Models for NH 3 volatilization from swine manure in under-floor pits and from finishing houses have been reported. 3,4 However, little information is published on a reliable model for predicting NH 3 emission from the naturally ventilated dairy cattle buildings.…”

Section: Ammonia (Nhmentioning

confidence: 99%

“…3,4 However, little information is published on a reliable model for predicting NH 3 emission from the naturally ventilated dairy cattle buildings. In this study, a model for predicting NH 3 emission from an NH 3 solution to free airstream was extended and applied to estimate NH 3 emissions from naturally ventilated dairy cattle buildings with slatted floor designs.…”

Section: Ammonia (Nhmentioning

confidence: 99%

“…For this purpose, laboratory experiments were conducted, and the results were used to update the basic model. The model estimations were compared with field measurement results of NH 3 emissions from five naturally ventilated dairy cattle buildings.…”

Section: Ammonia (Nhmentioning

confidence: 99%

“…5 NH 3 emission is a process of mass transfer from the NH 3 solution to the free atmosphere. In animal houses with slurry pits under the slatted floors, NH 3 emissions from urine puddles on the floor and slurry in the pit are the main sources, where NH 3 can be volatilized from the solution as free NH 3 . The following equation is generally used to describe the NH 3 volatilization under this condition 6 :…”

Section: Experimental Work Model Descriptionmentioning

confidence: 99%

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Model Estimation and Measurement of Ammonia Emission from Naturally Ventilated Dairy Cattle Buildings with Slatted Floor Designs

Zhang²,

Rom³

et al. 2006

Journal of the Air & Waste Management Association

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Laboratory experiments were carried out in a wind tunnel with a model of a slurry pit to investigate the characteristics of ammonia emission from dairy cattle buildings with slatted floor designs. Ammonia emission at different temperatures and air velocities over the floor surface above the slurry pit was measured with uniform feces spreading and urine sprinkling on the surface daily. The data were used to improve a model for estimation of ammonia emission from dairy cattle buildings. Estimates from the updated emission model were compared with measured data from five naturally ventilated dairy cattle buildings. The overall measured ammonia emission rates were in the range of 11-88 g per cow per day at air temperatures of 2.3-22.4°C. Ammonia emission rates estimated by the model were in the range of 19 -107 g per cow per day for the surveyed buildings. The average ammonia emission estimated by the model was 11% higher than the mean measured value. The results show that predicted emission patterns generally agree with the measured one, but the prediction has less variation. The model performance may be improved if the influence of animal activity and management strategy on ammonia emission could be estimated and more reliable data of air velocities of the buildings could be obtained.

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Section: Ammonia (Nhmentioning

confidence: 99%

Section: Ammonia (Nhmentioning

confidence: 99%

Section: Ammonia (Nhmentioning

confidence: 99%

Section: Ammonia (Nhmentioning

confidence: 99%

Section: Experimental Work Model Descriptionmentioning

confidence: 99%

See 3 more Smart Citations

Model Estimation and Measurement of Ammonia Emission from Naturally Ventilated Dairy Cattle Buildings with Slatted Floor Designs

Zhang²,

Rom³

et al. 2006

Journal of the Air & Waste Management Association

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The effect of biogas ebullition on ammonia emissions from animal manure–processing lagoons

Weaver

Harper²,

Visscher

et al. 2022

J of Env Quality

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Various models have been developed to determine ammonia (NH3) emissions from animal manure–processing lagoons to enable relatively simple estimations of emissions. These models allow estimation of actual emissions without intensive field measurements or “one‐size‐fits‐all” emission factors. Two mechanisms for lagoon NH3 emissions exist: (a) diffusive gas exchange from the water surface and (b) mass‐flow (bubble transport) from NH3 contained within the ebullition gas bubble (as it rises to the surface) produced from anaerobic decomposition of organic matter. The purpose of this research is to determine whether gas ebullition appreciably affects NH3 emissions and therefore should be considered in emissions models. Specifically, NH3 mass‐flow emissions were calculated and compared with calculated diffusive NH3 emissions. Mass‐flow NH3 emissions were evaluated based on a two‐film model, in connection with the acid dissociation constant of ammonium, to predict the degree of NH3 gas saturation within the bubbles. Average daily ammoniacal nitrogen concentration, pH, and measured biological gas production (ebullition) in conjunction with literature values for Henry's law constant were used to calculate emissions from NH3 saturation of ebullition gases. Ebullition enhancement of NH3 surface emissions due to increased turbulence was estimated from average lagoon ebullition rates and literature values of turbulence enhancement. Ebullition enhancement of NH3 surface emissions and ebullition mass‐flow NH3 emissions was determined to be <10% and <0.052%, respectively, of total NH3 emissions. Therefore, because ebullition effects are small, they may be neglected when developing process models to estimate NH3 emissions from water surfaces of swine manure processing lagoons.

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Effect of Type of Slatted Floor and Degree of Fouling of Solid Floor on Ammonia Emission Rates from Fattening Piggeries

Aarnink

Swierstra

Berg

et al. 1997

Journal of Agricultural Engineering Research

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A Computer Model for Predicting Ammonia Release Rates from Swine Manure Pits

Cited by 64 publications

References 0 publications

Model Estimation and Measurement of Ammonia Emission from Naturally Ventilated Dairy Cattle Buildings with Slatted Floor Designs

Model Estimation and Measurement of Ammonia Emission from Naturally Ventilated Dairy Cattle Buildings with Slatted Floor Designs

The effect of biogas ebullition on ammonia emissions from animal manure–processing lagoons

Effect of Type of Slatted Floor and Degree of Fouling of Solid Floor on Ammonia Emission Rates from Fattening Piggeries

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