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Computational Fluid Dynamics (CFD) Analysis of the Hydraulic Performance and Bio-Kinetics in a Full-Scale Oxidation Ditch.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Computational Fluid Dynamics (CFD) Analysis of the Hydraulic Performance and Bio-Kinetics in a Full-Scale Oxidation Ditch./
作者:	Pierre, Kiesha C.
面頁冊數:	1 online resource (101 pages)
附註:	Source: Dissertations Abstracts International, Volume: 83-02, Section: A.
Contained By:	Dissertations Abstracts International83-02A.
標題:	Environmental engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28645878click for full text (PQDT)
ISBN:	9798535511078

Computational Fluid Dynamics (CFD) Analysis of the Hydraulic Performance and Bio-Kinetics in a Full-Scale Oxidation Ditch.
Pierre, Kiesha C.

Computational Fluid Dynamics (CFD) Analysis of the Hydraulic Performance and Bio-Kinetics in a Full-Scale Oxidation Ditch. - 1 online resource (101 pages)

Source: Dissertations Abstracts International, Volume: 83-02, Section: A.

Thesis (Ph.D.)--University of South Florida, 2021.

Includes bibliographical references

An oxidation ditch is a biological wastewater treatment unit process where microorganisms are utilized to transform organic matter, and nitrogen from wastewater to meet the desirable effluent concentrations. Mechanical aerators are part of these biological reactors facilitating oxygen transfer for the aerobic microorganisms, while agitating and circulating the phase constituents within the ditch. Modeling the performance of an oxidation ditch involves combining hydrodynamics, oxygen mass transfer, and bio-kinetics and is one of the grand challenges that is of paramount importance in optimization of design and operations of these facilities in an energy efficient way while meeting the targeted effluent concentrations. Several computational fluid dynamics (CFD) models were developed and used to understand the hydrodynamics, flow patterns, and bio-kinetics for the design and operation of these oxidation ditches.This work developed a 3-D computational fluid dynamics (CFD) model of a full-scale oxidation ditch. The 3-D model was first used to investigate the impact of unsteady effects induced by variable aerator speed and time-dependent influent velocity on the hydrodynamics of the ditch. Subsequently, the CFD model is coupled with the Activated Sludge Model (ASM)-1, a popular bio-kinetics model, to provide a unique study that allow analysis of the hydrodynamics on the spatial and temporal distribution of the ASM-1 components, and ultimately the performance of the ditch. Simultaneously, two 1-D models were developed to determine extent which simplified models can be utilized. Lastly, a two-phase (wastewater-sludge) 3-D CFD model was developed to explore the effects of sludge stratification on the hydrodynamics and the temporal evolution and spatial distribution of ASM-1 components in the ditch. While the influent velocity does not greatly affect the hydrodynamics in the oxidation ditch, the aerator speed has a major impact on the hydrodynamics in the 3-D model. Additionally, the hydrodynamics in the oxidation ditch are mostly steady except for about an hour after adjusting the aerator speed. Due to the simplification of the flow, the 1-D model of the oxidation ditch was not able to predict spatial heterogeneities in dissolved oxygen observed in the 3-D model. As a result, the 1-D model was not able to predict comparable steady-state volume averaged concentration of soluble nitrate nitrite nitrogen (???) to the 3-D model. However, it did predict steady-state volume averaged concentration values of the other ASM-1 components in good agreement with the 3-D model. Furthermore, soluble ammonia ammonium nitrogen (???) and soluble nitrate nitrite nitrogen (???) were found to be more sensitive to changes to the volumetric mass transfer coefficient, ??? than readily biodegradable substrate (??) in both models. Finally, sludge stratification in the ditch had minimal impact on the mean flow spatial patterns and thus, the temporal evolution and spatial distribution of ASM-1 components. This was due to the small sludge volume fraction of the water-sludge mixture entering the ditch (0.004), relative (for example) to sludge volume fractions found in previous computational studies (0.02).

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798535511078Subjects--Topical Terms:

548583
Environmental engineering.
Subjects--Index Terms:

Computational Fluid DynamicsIndex Terms--Genre/Form:

542853
Electronic books.

Computational Fluid Dynamics (CFD) Analysis of the Hydraulic Performance and Bio-Kinetics in a Full-Scale Oxidation Ditch.
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245 1 0 $a Computational Fluid Dynamics (CFD) Analysis of the Hydraulic Performance and Bio-Kinetics in a Full-Scale Oxidation Ditch.
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500 $a Source: Dissertations Abstracts International, Volume: 83-02, Section: A.
500 $a Advisor: Tejada-Martinez, Andres; Sunol, Aydin.
502 $a Thesis (Ph.D.)--University of South Florida, 2021.
504 $a Includes bibliographical references
520 $a An oxidation ditch is a biological wastewater treatment unit process where microorganisms are utilized to transform organic matter, and nitrogen from wastewater to meet the desirable effluent concentrations. Mechanical aerators are part of these biological reactors facilitating oxygen transfer for the aerobic microorganisms, while agitating and circulating the phase constituents within the ditch. Modeling the performance of an oxidation ditch involves combining hydrodynamics, oxygen mass transfer, and bio-kinetics and is one of the grand challenges that is of paramount importance in optimization of design and operations of these facilities in an energy efficient way while meeting the targeted effluent concentrations. Several computational fluid dynamics (CFD) models were developed and used to understand the hydrodynamics, flow patterns, and bio-kinetics for the design and operation of these oxidation ditches.This work developed a 3-D computational fluid dynamics (CFD) model of a full-scale oxidation ditch. The 3-D model was first used to investigate the impact of unsteady effects induced by variable aerator speed and time-dependent influent velocity on the hydrodynamics of the ditch. Subsequently, the CFD model is coupled with the Activated Sludge Model (ASM)-1, a popular bio-kinetics model, to provide a unique study that allow analysis of the hydrodynamics on the spatial and temporal distribution of the ASM-1 components, and ultimately the performance of the ditch. Simultaneously, two 1-D models were developed to determine extent which simplified models can be utilized. Lastly, a two-phase (wastewater-sludge) 3-D CFD model was developed to explore the effects of sludge stratification on the hydrodynamics and the temporal evolution and spatial distribution of ASM-1 components in the ditch. While the influent velocity does not greatly affect the hydrodynamics in the oxidation ditch, the aerator speed has a major impact on the hydrodynamics in the 3-D model. Additionally, the hydrodynamics in the oxidation ditch are mostly steady except for about an hour after adjusting the aerator speed. Due to the simplification of the flow, the 1-D model of the oxidation ditch was not able to predict spatial heterogeneities in dissolved oxygen observed in the 3-D model. As a result, the 1-D model was not able to predict comparable steady-state volume averaged concentration of soluble nitrate nitrite nitrogen (???) to the 3-D model. However, it did predict steady-state volume averaged concentration values of the other ASM-1 components in good agreement with the 3-D model. Furthermore, soluble ammonia ammonium nitrogen (???) and soluble nitrate nitrite nitrogen (???) were found to be more sensitive to changes to the volumetric mass transfer coefficient, ??? than readily biodegradable substrate (??) in both models. Finally, sludge stratification in the ditch had minimal impact on the mean flow spatial patterns and thus, the temporal evolution and spatial distribution of ASM-1 components. This was due to the small sludge volume fraction of the water-sludge mixture entering the ditch (0.004), relative (for example) to sludge volume fractions found in previous computational studies (0.02).
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Environmental engineering. $3 548583
650 4 $a Engineering. $3 586835
650 4 $a Organic chemistry. $3 523952
650 4 $a Research. $3 531893
650 4 $a Nitrates. $3 914879
650 4 $a Pollutants. $3 551065
650 4 $a Evolution. $3 532919
650 4 $a Bubbles. $3 1530439
650 4 $a Fluid dynamics. $3 545210
650 4 $a Sanitation. $3 676085
650 4 $a Water treatment. $3 3683746
650 4 $a Energy. $3 876794
650 4 $a Liquor. $3 3683856
650 4 $a Efficiency. $3 753744
650 4 $a Nitrogen. $3 1314426
650 4 $a Simulation. $3 644748
650 4 $a Velocity. $3 3560495
650 4 $a Partial differential equations. $3 2180177
650 4 $a Viscosity. $3 1050706
650 4 $a Sludge. $3 3685350
650 4 $a Carbon. $3 604057
650 4 $a Design. $3 518875
650 4 $a Kinetics. $3 717752
650 4 $a Fluid mechanics. $3 528155
650 4 $a Microorganisms. $3 666946
650 4 $a Hydraulics. $3 669758
653 $a Computational Fluid Dynamics
653 $a Hydraulic performance
653 $a Bio-kinetics
653 $a Full-scale oxidation ditch
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710 2 $a University of South Florida. $b Civil and Environmental Engineering. $3 1680496
773 0 $t Dissertations Abstracts International $g 83-02A.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28645878 $z click for full text (PQDT)

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