Mass transfer in jet loop reactors

Dirix, C.A.M.C.; Wiele, K. van der

doi:10.1016/0009-2509(90)80113-s

Cited by 57 publications

(36 citation statements)

References 6 publications

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“…However, thermophilic MBRs have shown a higher level of fouling due to elevated concentration of EPS when compared to mesophilic MBRs probably because thermophilic sludge contains higher levels of small particles than mesophilic sludge (Visvanathan et al 2007). In a jet loop reactor, dispersion is performed by a liquid jet drive (Farizoglu and Keskinler 2006;Dirix and van der Wiele 1990;Dutta and Raghavan 1987) whereby liquid is injected at high velocity to cause a fine dispersion of liquid and gaseous phases. The formation of bubbles permits better oxygen transfer to the microorganisms and grants homogeneous biomass dispersion (Ince et al 2013).…”

Section: Variations In Mbr Technologymentioning

confidence: 99%

Membrane bioreactor technology for leachate treatment at solid waste landfills

Hashisho

El‐Fadel

2016

Rev Environ Sci Biotechnol

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Controlled landfilling remains a commonly applied method for municipal solid waste disposal with leachate generation being an inevitable consequence of the decomposition of the waste and the percolation of water through decomposing waste. The membrane bioreactor (MBR) technology has evolved into an effective process in treating such high strength wastewater streams because of its ability to retain high biomass concentration through membrane separation. This paper presents a critical review of the application of the MBR technology for the treatment of leachate and evaluates its performance in this context while highlighting factors affecting MBR operation. The paper concludes with outlining existing gaps and future research needs to improve the understanding and performance of the MBR technology for leachate treatment.

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Section: Variations In Mbr Technologymentioning

confidence: 99%

Membrane bioreactor technology for leachate treatment at solid waste landfills

Hashisho

El‐Fadel

2016

Rev Environ Sci Biotechnol

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“…Ejector performance of gassolid flow through ejector and analysis and testing of high entrainment single nozzle ejectors with variable area mixing tubes [6,7] was carried out for different ejector geometries with fixed mixing tube length 10 times the mixing tube diameter. In the experimental investigation given in mass transfer in jet loop reactors [8], the results showed that mixing tube length seems to have no obvious effect and changes of L/D ratio from 2 to10 results give in a slight decrease in the efficiency of ejector. On the other hand [9] showed that ejector with high L/D ratio values creates higher volumetric mass transfer coefficients compared to that with a lower values.…”

Section: Introductionmentioning

confidence: 98%

Study of the Configuration and Performance of Air-Air Ejectors based on CFD Simulation

Am¹,

Mh²,

Zm³

et al. 2017

J Aeronaut Aerospace Eng

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This paper describes a numerical study of gas-gas ejector performance for different operating conditions and geometrical configurations. The performance of ejector obtained based on a simulation procedure of linearized and axisymmetric subsonic and supersonic flow using Fluent Package. A conventional finite-volume scheme utilized to solve two-dimensional transport equations with the standard k-ω SST turbulence model. The model is solved in three regions namely, the primary flow nozzle, the secondary flow channel, and the region of interaction between the supersonic nozzle jet and the secondary flow. The effect of gas motive pressure the mixing part and tail section (pipe or diffuser) geometry on the ejector performance are studied. The computational results are validated using published experimental data with acceptable agreements. The numerical results indicate that the ejector geometry has a pronounced effect on the flow parameters (i.e., pressure and gas velocity) and the ejector performance. In addition, predicted numerical results indicate that when the motive-stream velocity exceeds the speed of sound, shock waves are unavoidable inside ejectors and that shock wave pattern in mixing part has a dominant effect on ejector performance. In addition, the results indicate that the shock location inside the nozzle and the separation point are affected by the motive pressure. The results show also that configuration with convergent-divergent mixing section is much better for mixing process than the other tested configurations.

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“…The effect of different operating conditions and ejector geometry parameters on the performance of ejector has been experimentally investigated by several researchers [10][11][12][13][14][15]. From those authors, Dirix and van de Wiele [13] and Cramers et al [15] have studied in more detail concerning the influence of geometrical parameter of ejector such as mixing tube length on the hydrodynamics and mass transfer characteristics of ejector.…”

Section: Introductionmentioning

confidence: 98%

“…From those authors, Dirix and van de Wiele [13] and Cramers et al [15] have studied in more detail concerning the influence of geometrical parameter of ejector such as mixing tube length on the hydrodynamics and mass transfer characteristics of ejector. Unfortunately, there were contradictory results in their experiments, especially on the influence of the mixing tube on the volumetric mass transfer coefficient.…”

Section: Introductionmentioning

confidence: 99%

Investigation on hydrodynamics and mass transfer characteristics of a gas-liquid ejector using three-dimensional CFD modeling

et al. 2008

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An investigation of the gas-liquid ejector has been carried out to study the influence of operating conditions and ejector geometries on the hydrodynamics and mass transfer characteristics of the ejector by using three-dimensional CFD modeling. The CFD results were validated with experimental data. Flow field analysis and prediction of ejector performance were also conducted. Variations of the operating conditions were made by changing the gas-liquid flow rates ratio in the range of 0.2 to 1.2. The length to diameter ratio of mixing tube (L M /D M ) was also varied from 4 to 10. CFD studies show that at L M /D M =5.5, the volumetric mass transfer coefficient increases with respect to gas flow rate. Meanwhile, at L M /D M =4, the plot of volumetric mass transfer coefficient to gas-liquid flow rate ratio reaches the maximum at gas-liquid flow rate ratio of 0.6. This study also shows that volumetric mass transfer coefficient decreases with the increase of mixing tube length.

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Mass transfer in jet loop reactors

Cited by 57 publications

References 6 publications

Membrane bioreactor technology for leachate treatment at solid waste landfills

Membrane bioreactor technology for leachate treatment at solid waste landfills

Study of the Configuration and Performance of Air-Air Ejectors based on CFD Simulation

Investigation on hydrodynamics and mass transfer characteristics of a gas-liquid ejector using three-dimensional CFD modeling

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