Impact of agitation and aeration on hydraulics and oxygen transfer in an aeration ditch: Local and global measurements

Vermande, Stephanie; Simpson, K. G. L.; Essemiani, Karim; Fonade, Christian; Meinhold, Jens

doi:10.1016/j.ces.2005.09.016

Cited by 24 publications

(15 citation statements)

References 4 publications

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“…Similar observations in aerated channel reactors and full-scale oxidation ditches were made by various authors [9][10][11]13].…”

Section: Flow Behavior In Aerated Channel Reactorssupporting

confidence: 75%

“…Despite this, original data on the distribution of the horizontal water velocity inside the tank are limited. Gillot et al [10] measured the horizontal velocity of the liquid at nine points that were regularly distributed in three heights of a pilot-scale oxidation ditch, while Vermande et al [11] recorded 25 water velocity measurements at different horizontal and vertical positions of a bench-scale oxidation ditch. In both studies, however, only average values were given.…”

Section: Introductionmentioning

confidence: 99%

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High aeration rate enhances flow stratification in full-scale oxidation ditch

Diamantis

Papaspyrou

Melidis

et al. 2009

Bioprocess Biosyst Eng

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Aerated channel reactors with a uniform field of aeration may display flow stratification and short-circuit phenomena in wastewater treatment systems. In this study, we present data suggesting that flow stratification is closely related to the aeration rate and the arrangement of aerators. A full-scale oxidation ditch, with a total volume of 6,500 m(3) and a membrane-diffused aerated zone of 60 x 7 x 5 m (length-width-depth), was selected for water velocity measurements. Two profiles of the oxidation ditch were studied in detail: the first one was at the end of the aerated zone and the second one at the end of the anoxic zone. The results of this work demonstrate that the horizontal water velocity at the end of the aerated zone displayed significant stratification, with maximum velocity near the water surface (0.5-0.7 m/s) and almost zero velocity at a depth of 2.5 m. At the end of the anoxic zone, water velocity was uniform and equal to 0.27-0.31 m/s. Increasing the aeration rate from 1,800 to 4,300 m(3)/h, almost 90% of the water flow was found to discharge through the upper-half of the channel reactor profile. Different options to mitigate flow stratification of the oxidation ditch are discussed in this paper.

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“…Similar observations in aerated channel reactors and full-scale oxidation ditches were made by various authors [9][10][11]13].…”

Section: Flow Behavior In Aerated Channel Reactorssupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

High aeration rate enhances flow stratification in full-scale oxidation ditch

Diamantis

Papaspyrou

Melidis

et al. 2009

Bioprocess Biosyst Eng

View full text Add to dashboard Cite

show abstract

“…However, few experiments are about the hydrodynamic characteristics in oxidation ditches. To the best of the authors' knowledge, only Chen et al (2006), Luo et al (2005), Fayolle et al (2006) and Vermande et al (2007) experimented on the hydrodynamics of oxidation ditches. Chen et al (2006) mainly focused on the application of PIV using cross-correlation method in oxidation ditches.…”

Section: Introductionmentioning

confidence: 96%

“…Fayolle et al (2006) did in situ measurements on axial liquid velocity, bubble size and oxygen transfer coefficient. Vermande et al (2007) presented some results about the hydraulics and aeration performance in a pilot-scale aerated basin. They only estimated the horizontal water velocity by a flow meter Flo-Mate, characterized gas phase and measured the oxygen transfer coefficient by a bi-optical probe and oxygen probes, respectively.…”

Section: Introductionmentioning

confidence: 99%

PDA experiments and CFD simulation of a lab-scale oxidation ditch with surface aerators

Long

Wang

et al. 2010

Chemical Engineering Research and Design

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“…Many experimental and modeling studies have been conducted in this regard [8][9][10][11][12]. However, a wide range of activated sludge concentrations has not been employed in these research works.…”

Section: Introductionmentioning

confidence: 98%