A review of slurry aeration 3. Performance of aerators

Cumby, T.R.

doi:10.1016/0021-8634(87)90073-4

Cited by 28 publications

(13 citation statements)

References 10 publications

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“…These studies often apply the mechanical aerators used to aerate other wastewaters to liquid swine manure storages. A summary of the mechanical aerator types tested in water and wastewater aeration including compressed air, mechanical surface, mechanical subsurface, and combined compressed air and venturi is provided by Cumby [8]. Use of the venturi principle to design aeration apparatuses has become popular in recent years, as reported by many researchers [9][10][11], in that venturi aerators have high air injection efficiencies that could ensure effective aeration in wastewater treatment systems.…”

Section: Introductionmentioning

confidence: 98%

Aeration efficiency influenced by venturi aerator arrangement, liquid flow rate and depth of diffusing pipes

Dong

Zhu

et al. 2012

Environmental Technology

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The effect of aerator module configuration, liquid flow rate and diffuser submergence on oxygen transfer efficiency was examined in a surface aeration system with venturi injectors using the clean water test. Six venturi aerator modules were evaluated and the results indicated that better aeration efficiencies could be achieved by simply changing the way the venturi aerators were connected. Among all the configurations examined (modules a-f), two and three aerators connected in parallel (modules d, e and f) were able to bring more oxygen into water than the others. An increase in liquid flow rate led to an enhancement of the oxygen transfer coefficients, but the improvement was reduced if the liquid flow rate was too high. The oxygen transfer coefficient was found to have a relationship with the depth of diffusing pipes (surface aeration depth) for the surface aeration system and an optimal depth of around 40 cm was obtained from this study.

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Section: Introductionmentioning

confidence: 98%

Aeration efficiency influenced by venturi aerator arrangement, liquid flow rate and depth of diffusing pipes

Dong

Zhu

et al. 2012

Environmental Technology

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“…There are multiple methods of aerating manure slurries, including compressed air (as 310 replicated here), mechanical mixing (surface and subsurface), pumped liquid, or a combination 311 of compressed air and mechanical mixing (Cumby, 1987). The use of compressed air benefits 312 from having a simple, low cost design and the ability to add to existing lagoons.…”

Section: Aeration On Monensin Dissipation 265mentioning

confidence: 99%

“…However, 313 aeration efficiency is hindered in large, shallow ponds due to low contact time of bubbles with 314 the manure slurry as they rise. While smaller bubbles (ideally <5 mm) will rise more slowly with 315 a higher gas-transfer surface area help overcome this issue, manure slurries also tend to clog 316 small bubble diffusers, limiting their effectiveness (Cumby, 1987;Singleton and Little, 2006). 317…”

Section: Aeration On Monensin Dissipation 265mentioning

confidence: 99%

Effects of solid-liquid separation and storage on monensin attenuation in dairy waste management systems

Hafner

Watanabe²,

Harter³

et al. 2017

Journal of Environmental Management

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Environmental release of veterinary pharmaceuticals has been of regulatory concern for more than a decade. Monensin is a feed additive antibiotic that is prevalent throughout the dairy industry and is excreted in dairy waste. This study investigates the potential of dairy waste management practices to alter the amount of monensin available for release into the environment. Analysis of wastewater and groundwater from two dairy farms in California consistently concluded that monensin is most present in lagoon water and groundwater downgradient of lagoons. Since the lagoons represent a direct source of monensin to groundwater, the effect of waste management, by mechanical screen separation and lagoon aeration, on aqueous monensin concentration was investigated through construction of lagoon microcosms. The results indicate that monensin attenuation is not improved by increased solid-liquid separation prior to storage in lagoons, as monensin is rapidly desorbed after dilution with water. Monensin is also shown to be easily degraded in lagoon microcosms receiving aeration, but is relatively stable and available for leaching under typical anaerobic lagoon conditions.

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“…When the concentration falls outside the preset upper and lower limits, the aeration system will be either stopped or started (Johnston, 1984). However, this simple logic may not work as expected in a real world since the performance of any aeration systems is largely environment speci"c. For instance, in manure environment, the oxygen uptake rate by the aerobes may play a role in determining the performance of an intermittent aeration system (Saxon, 1972;Cumby, 1987). As the available soluble substrate is oxidized, signi"cant variations in the oxygen uptake rate may be observed at di!erent aeration stages.…”

Section: Introductionmentioning

confidence: 99%

AP—Animal Production Technology

Zhu

2001

Journal of Agricultural Engineering Research

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A review of slurry aeration 3. Performance of aerators

Cited by 28 publications

References 10 publications

Aeration efficiency influenced by venturi aerator arrangement, liquid flow rate and depth of diffusing pipes

Aeration efficiency influenced by venturi aerator arrangement, liquid flow rate and depth of diffusing pipes

Effects of solid-liquid separation and storage on monensin attenuation in dairy waste management systems

AP—Animal Production Technology

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