Mass Transfer Coefficient of Ammonia in Liquid Swine Manure and Aqueous Solutions

Arogo, J.; Zhang, R.H.; Riskowski, G. L.; Christianson, Laura E.; Day, D. L.

doi:10.1006/jaer.1998.0390

Cited by 117 publications

(56 citation statements)

References 14 publications

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“…5 A laboratory investigation was reported concerning the impact of NH 3 emission due to the liquid-air temperature differences. 6 The results may provide some basic knowledge on the potential of using manure cooling in a slurry pit to reduce the emission. To determine the mass transfer coefficient, the surface concentration along the whole emission surface was calculated by dissociation constant and Henry's constant models.…”

Section: Ammonia (Nhmentioning

confidence: 99%

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Experimental and Numerical Study on Effects of Airflow and Aqueous Ammonium Solution Temperature on Ammonia Mass Transfer Coefficient

Rong

Nielsen

Zhang

2010

Journal of the Air & Waste Management Association

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This paper reports the results of an investigation, based on fundamental fluid dynamics and mass transfer theory, carried out to obtain a general understanding of ammonia mass transfer from an emission surface. The effects of airflow and aqueous ammonium solution temperature on ammonia mass transfer are investigated by using computational fluid dynamics (CFD) modeling and by a mechanism modeling using dissociation constant and Henry's constant models based on the parameters measured in the experiments performed in a wind tunnel. The validated CFD model by experimental data is used to investigate the surface concentration distribution and mass transfer coefficient at different temperatures and velocities for which the Reynolds number is from 1.36 ϫ 10 4 to 5.43 ϫ 10 4 (based on wind tunnel length). The surface concentration increases as velocity decreases and varies greatly along the airflow direction on the emission surface. The average mass transfer coefficient increases with higher velocity and turbulence intensity. However, the mass transfer coefficient estimated by CFD simulation is consistently larger than the calculated one by the method using dissociation constant and Henry's constant models. In addition, the results show that the liquid-air temperature difference has little impact on the simulated mass transfer coefficient by CFD modeling, whereas the mass transfer coefficient increases with higher liquid temperature using the other method under the conditions that the liquid temperature is lower than the air temperature. Although there are differences of mass transfer coefficients between these two methods, the mass transfer coefficients determined by these two methods are significantly related. INTRODUCTIONAmmonia (NH 3 ) emission not only leads to poor air quality in livestock buildings but also causes environmental acidification, 1 which will seriously impact the environment and natural sensitive ecosystem. NH 3 emissions and deposition to terrestrial and aquatic ecosystems have increased nearly 4-fold in the past 135 yr. 2 This research indicated that much of the increase has been associated with an increase in agriculture activities, especially with respect to the animal productions. Around 75% of European NH 3 emission comes from livestock productions, 3 and 80% of NH 3 emission in the United States is from domestic animal waste. 4 Therefore, NH 3 emission should be well controlled and a better understanding of the processes underlying NH 3 emission remains an important research topic.Evidence from various investigations and systematic studies suggests that environmental and manure properties have important impacts on NH 3 emission and the mass transfer coefficient. 5-7 These studies were mainly conducted by experiments using small-scale environmental chambers or wind tunnel devices. Mechanistic models of NH 3 release were reviewed according to 30 available research reports. 5 A laboratory investigation was reported concerning the impact of NH 3 emission due to the liquid-air temperature d...

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Section: Ammonia (Nhmentioning

confidence: 99%

“…[5][6][7] These studies were mainly conducted by experiments using small-scale environmental chambers or wind tunnel devices. Mechanistic models of NH 3 release were reviewed according to 30 available research reports.…”

Section: Ammonia (Nhmentioning

confidence: 99%

Experimental and Numerical Study on Effects of Airflow and Aqueous Ammonium Solution Temperature on Ammonia Mass Transfer Coefficient

Rong

Nielsen

Zhang

2010

Journal of the Air & Waste Management Association

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“…Sólo en febrero se observó una disminución en la concentración en todos los pretratamientos (-2,13 ± 0,23 NAT mg L -1 ) y esto se debió a la baja temperatura con un pH cercano a la neutralidad en casi todos los pretratamientos, así como una baja en la DBO. El estado de óxido-reducción del amonio depende de la temperatura y el pH del medio, mediante la alteración de estas dos variables es posible modificar el equilibrio hacia el gas NH3 (Arogo et al, 1999;Lei et al, 2007). En todos los pretratamientos a excepción del alcalino, se presentó una alta producción de NAT durante todos los meses y consistentemente el pretratamiento con la mayor producción fue el térmico y el menor, el mecánico.…”

Section: Remoción De Nutrientes Nitrógeno Amoniacal Totalunclassified

Efecto de cuatro pretratamientos en la digestion anaerobica y la remocion de nutrientes de efluentes, de un sistema de recirculacion acuicola

González-Hermoso

Segovia

2017

lajar

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RESUMEN. Los sistemas de recirculación acuícola producen efluentes (fracción disuelta y fracción particulada) con altas concentraciones de nitrógeno y fósforo que son una fuente potencial de contaminación si no se tratan en forma adecuada. El tratamiento de los lodos y remoción de nutrientes por medio de la digestión anaeróbica se ha vuelto una alternativa viable para la reducción y la estabilización de los lodos provenientes de los sistemas de recirculación acuícola. El presente estudio determinó el efecto de cuatro diferentes pretratamientos (alcalino, mecánico, térmico y biológico) en la reducción de los lodos, la desnitrificación, la producción de biogás y la dinámica del nitrógeno y el fósforo proveniente de los efluentes de un cultivo de tilapia nilótica (Oreochromis niloticus, Linnaeus, 1758) en condiciones hiper-intensivas con experimentos mensuales durante un año, con duración de 15 días cada uno. Tras la aplicación de pretratamientos en los lodos de origen acuícola, se obtuvo un aumento en la liberación de nitrógeno amoniacal total con respecto al control, de igual forma se obtuvo una remoción de nitritos en todos los pretratamientos (˃90%), se incrementó la remoción de sólidos suspendidos totales, siendo mayor en los pretratamientos (˃20,3%) en comparación con el control (14,6%), así como también se incrementó la producción de biogás, siendo el pretratamiento biológico donde se obtuvo la mayor concentración (45,18 cm 3 L -1). Esto indica que la aplicación de pretratamientos en los efluentes acuícolas mejora los procesos de desnitrificación y digestión anaeróbica, pudiendo reducir los tiempos de retención hidráulica. Palabras clave: desnitrificación, digestión anaeróbica, pretratamientos, efluentes, sistema de recirculación. Effect of four different pretreatments in anaerobic digestion and nutrientremoval of effluents from a recirculating aquaculture system ABSTRACT. Intensive aquaculture recirculating systems produce effluents (dissolved and particulate solids) with concentrations of nitrogen and phosphorus, a potential source of pollution if they are not properly treated. The sludge and nutrient removal by anaerobic digestion has become an alternative for aquaculture sludge digestion and stabilization. In this study we determine the effect of four different pretreatments (alkaline, mechanical, thermal and biological) in sludge reduction and denitrification efficiency, biogas production and nitrogen and phosphorus dynamics from a hyper-intensive Nile tilapia (Oreochromis niloticus, Linnaeus, 1758) culture in 15 days experiments, one per month for one year. After application of pretreatments in aquaculture sludge, an increase in the release of total ammonia nitrogen was obtained with respect to the control, in the same way nitrate removal was obtained in all pretreatments (˃90%), The increase in total suspended solids removal was higher in pretreatment (˃20.3%) compared to control (14.6%), As well as the biogas production increase, being the biological pre-treatment where the highest concentration was ...

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“…Na skutek fermentacji metanowej dochodzi również do obniżania zawartości materii organicznej oraz azotu, który przekształca się w azot amonowy, co jest korzystne przy wykorzystaniu gnojowicy jako nawozu [34]. Ilość emitowanych gazów z gnojowicy uzależniona jest od pH, temperatury gnojowicy i otoczenia oraz od jej składu chemicznego [35,36]. Emisja gazów podczas magazynowania zależy od wielu czynników, między innymi od zawartości makroskładników, temperatury i okresu przechowywania oraz powstawania naturalnej osłony w postaci kożucha [37][38][39].…”

Section: Charakterystyka Chemiczna Gnojowicyunclassified

Gas Emissions during Slurry Management

Smurzyńska

Dach

Dworecki

et al. 2016

Eng. Prot. Environ.

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Mass Transfer Coefficient of Ammonia in Liquid Swine Manure and Aqueous Solutions

Cited by 117 publications

References 14 publications

Experimental and Numerical Study on Effects of Airflow and Aqueous Ammonium Solution Temperature on Ammonia Mass Transfer Coefficient

Experimental and Numerical Study on Effects of Airflow and Aqueous Ammonium Solution Temperature on Ammonia Mass Transfer Coefficient

Efecto de cuatro pretratamientos en la digestion anaerobica y la remocion de nutrientes de efluentes, de un sistema de recirculacion acuicola

Gas Emissions during Slurry Management

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