Use of three-dimensional computational fluid dynamics model for a new configuration of circular primary settling tank

Appropriately used, computational fluid dynamics models are powerful tools to design and optimize primary settling tanks (PSTs). This paper uses a Fluent-based 3D model to identify the possible causes for underperformance of the circular PSTs at the Cali waste-water treatment plant, Colombia, and to...

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Autores principales:	A. G. Griborio, J. A. Rodríguez, L. Enriquez, J. A. McCorquodale
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	center well circular primary settling tank computational fluid dynamics Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/83ac74fa42284987b01cbf6feff1e51b
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spelling	oai:doaj.org-article:83ac74fa42284987b01cbf6feff1e51b2021-11-06T11:13:41ZUse of three-dimensional computational fluid dynamics model for a new configuration of circular primary settling tank0273-12231996-973210.2166/wst.2021.110https://doaj.org/article/83ac74fa42284987b01cbf6feff1e51b2021-07-01T00:00:00Zhttp://wst.iwaponline.com/content/84/2/333https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732Appropriately used, computational fluid dynamics models are powerful tools to design and optimize primary settling tanks (PSTs). This paper uses a Fluent-based 3D model to identify the possible causes for underperformance of the circular PSTs at the Cali waste-water treatment plant, Colombia, and to propose design modifications to improve performance. A new configuration for the center well (CW) is proposed and evaluated. The influence of a rotational sludge scraper and of continuous sludge removal were considered in the numerical simulation. The new configuration included the modification of the current CW diameter and the location of a second baffle with the CW. The results suggest that the installation of the second baffle allows a more uniform flow distribution within the PST and consequently, the hydrodynamic problems associated with short-circuiting of the influent to the bottom of the tank are reduced. The second baffle suppresses the downward current, effectively dissipates the kinetic energy in the influent and forces the particles to move toward the bottom of the PST. In addition, the second CW baffle allows the formation in the inlet zone of a consistently more concentrated sludge blanket layer and thicker sludge, reducing the risk of solids leaving in the effluent of the PST. HIGHLIGHTS Three-dimensional CFD model for the evaluation of a new configuration for a circular PST.; The model includes the simulation of the sludge scraper movement by means of a sliding mesh.; Optimization of circular PST performance.; New configuration of center well for circular PST.; Formation of a consistent more concentrated sludge blanket in circular PST.;A. G. GriborioJ. A. RodríguezL. EnriquezJ. A. McCorquodaleIWA Publishingarticlecenter wellcircular primary settling tankcomputational fluid dynamicsEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 84, Iss 2, Pp 333-348 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	center well circular primary settling tank computational fluid dynamics Environmental technology. Sanitary engineering TD1-1066
spellingShingle	center well circular primary settling tank computational fluid dynamics Environmental technology. Sanitary engineering TD1-1066 A. G. Griborio J. A. Rodríguez L. Enriquez J. A. McCorquodale Use of three-dimensional computational fluid dynamics model for a new configuration of circular primary settling tank
description	Appropriately used, computational fluid dynamics models are powerful tools to design and optimize primary settling tanks (PSTs). This paper uses a Fluent-based 3D model to identify the possible causes for underperformance of the circular PSTs at the Cali waste-water treatment plant, Colombia, and to propose design modifications to improve performance. A new configuration for the center well (CW) is proposed and evaluated. The influence of a rotational sludge scraper and of continuous sludge removal were considered in the numerical simulation. The new configuration included the modification of the current CW diameter and the location of a second baffle with the CW. The results suggest that the installation of the second baffle allows a more uniform flow distribution within the PST and consequently, the hydrodynamic problems associated with short-circuiting of the influent to the bottom of the tank are reduced. The second baffle suppresses the downward current, effectively dissipates the kinetic energy in the influent and forces the particles to move toward the bottom of the PST. In addition, the second CW baffle allows the formation in the inlet zone of a consistently more concentrated sludge blanket layer and thicker sludge, reducing the risk of solids leaving in the effluent of the PST. HIGHLIGHTS Three-dimensional CFD model for the evaluation of a new configuration for a circular PST.; The model includes the simulation of the sludge scraper movement by means of a sliding mesh.; Optimization of circular PST performance.; New configuration of center well for circular PST.; Formation of a consistent more concentrated sludge blanket in circular PST.;
format	article
author	A. G. Griborio J. A. Rodríguez L. Enriquez J. A. McCorquodale
author_facet	A. G. Griborio J. A. Rodríguez L. Enriquez J. A. McCorquodale
author_sort	A. G. Griborio
title	Use of three-dimensional computational fluid dynamics model for a new configuration of circular primary settling tank
title_short	Use of three-dimensional computational fluid dynamics model for a new configuration of circular primary settling tank
title_full	Use of three-dimensional computational fluid dynamics model for a new configuration of circular primary settling tank
title_fullStr	Use of three-dimensional computational fluid dynamics model for a new configuration of circular primary settling tank
title_full_unstemmed	Use of three-dimensional computational fluid dynamics model for a new configuration of circular primary settling tank
title_sort	use of three-dimensional computational fluid dynamics model for a new configuration of circular primary settling tank
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/83ac74fa42284987b01cbf6feff1e51b
work_keys_str_mv	AT aggriborio useofthreedimensionalcomputationalfluiddynamicsmodelforanewconfigurationofcircularprimarysettlingtank AT jarodriguez useofthreedimensionalcomputationalfluiddynamicsmodelforanewconfigurationofcircularprimarysettlingtank AT lenriquez useofthreedimensionalcomputationalfluiddynamicsmodelforanewconfigurationofcircularprimarysettlingtank AT jamccorquodale useofthreedimensionalcomputationalfluiddynamicsmodelforanewconfigurationofcircularprimarysettlingtank
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Use of three-dimensional computational fluid dynamics model for a new configuration of circular primary settling tank

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