Enhancing sedimentation using newly proposed virtual bed concept

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dc.contributor.author

He, Cheng

Chittibabu, Padala

Nguyen, David

Rochfort, Quintin

dc.date.accepted

2023-11-09

dc.date.accessioned

2024-09-05T18:36:52Z

dc.date.available

2024-09-05T18:36:52Z

dc.date.issued

2024-01-27

dc.date.submitted

2023-01-09

dc.description - en

In this paper, a new method for enhancing sedimentation and protecting the settled particle was proposed.

dc.description.abstract - en

One of the greatest challenges faced when using gravity settling is achieving efficient particle removal and retention rates under high inflow rates. This paper proposes a new method for enhancing sedimentation and protecting the settled particle. This is accomplished by placing one layer of the virtual bed above the real bed to divide the water body into hydraulically different upper and lower regions. The normal structure of the newly-proposed virtual bed is a flat plate with many small perforations. When the water flows along the top surface of the virtual bed, it creates two effects: (1) it isolates and protects water in the area below the virtual bed from being disturbed by the fast and turbulent flows above, which enhances sedimentation of the particles in the lower region and protects the sediment which could be eroded; and (2) the vertical vortex generated by the surficial flows passing over the openings helps the nearby suspended particles to enter the quiescent water region below. To assess the performance of the newly-proposed virtual bed, a rectangular settling tank was used to conduct comparison tests of particle removal with three particle size ranges, four inflow rates, five virtual bed structural designs, and multiple experimental conditions. The results clearly showed that, compared with a traditional settling tank (without the virtual bed), the addition of the proposed settling structure notably enhanced the particle settling rate by 10%–15% for the particles tested and experimental conditions assessed. The virtual bed method easily can be applied to various water treatment devices and facilities to enhance the suspended particle removal efficiencies in treatments of storm runoff, wastewater, and many other kinds of water without the need for chemical additions or energy-intensive processes.

dc.description.fosrctranslation - fr

Cet article propose une nouvelle méthode pour améliorer la sédimentation et protéger les particules déposées.

dc.identifier.doi

https://doi.org/10.1061/JOEEDU.EEENG-7314

dc.identifier.issn

0733-9372

1943-7870

dc.identifier.uri

https://open-science.canada.ca/handle/123456789/2915

dc.language.iso

en

dc.publisher

American Society of Civil Engineers

dc.rights - en

Creative Commons Attribution 4.0 International (CC BY 4.0)

dc.rights - fr

Creative Commons Attribution 4.0 International (CC BY 4.0)

dc.rights.openaccesslevel - en

Gold

dc.rights.openaccesslevel - fr

Or

dc.rights.uri - en

https://creativecommons.org/licenses/by/4.0/

dc.rights.uri - fr

https://creativecommons.org/licenses/by/4.0/deed.fr

dc.subject - en

Nature and environment

Science and technology

dc.subject - fr

Nature et environnement

Sciences et technologie

dc.subject.en - en

Nature and environment

Science and technology

dc.subject.fr - fr

Nature et environnement

Sciences et technologie

dc.title - en

Enhancing sedimentation using newly proposed virtual bed concept

dc.title.alternative - fr

Amélioration de la sédimentation au moyen du concept de lit virtuel nouvellement proposé

dc.type - en

Article

dc.type - fr

Article

local.article.journalissue

4

local.article.journaltitle

Journal of Environmental Engineering

local.article.journalvolume

150

local.pagination

8 pages

local.peerreview - en

Yes

local.peerreview - fr

Oui

local.requestdoi

No

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