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Description: W14-Proceedings
A Protocol for Optimization of Activated Sludge Mixing
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Description: W14-Proceedings
A Protocol for Optimization of Activated Sludge Mixing

A Protocol for Optimization of Activated Sludge Mixing

A Protocol for Optimization of Activated Sludge Mixing

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Description: W14-Proceedings
A Protocol for Optimization of Activated Sludge Mixing
Abstract
The paper outlines a protocol for comprehensive evaluation of mixing devices for activated sludge tanks using field testing for calibration of computational fluid dynamic (CFD) modeling to compare the impacts of tank and mixing device geometry on mixing and energy efficiency. The protocol includes a CFD model for activated sludge solids settling and transport which captures the influence of solids concentration gradients on fluid motion. This element of the protocol is unique in that almost all analyses completed to date for activated sludge biokinetic modeling or mixing have assumed either 1) complete mixing or 2) neutral density CFD. The protocol has been applied to date to several types of mixing devices including jet aeration and mixing, horizontal shaft propeller mixers, and diffused aeration. Field testing of several other types of mixing devices has also been accomplished. The protocol is recommended to optimize design and application of mixing devices for activated sludge service in aerated, anoxic, and anaerobic tanks as part of biological treatment processes. The approach can be extended to incorporate biokinetic models that more accurately predict the impact of tank geometry and mixer configuration on treatment efficiency than can be achieved assuming complete mixing or neutral density CFD.
The paper outlines a protocol for comprehensive evaluation of mixing devices for activated sludge tanks using field testing for calibration of computational fluid dynamic (CFD) modeling to compare the impacts of tank and mixing device geometry on mixing and energy efficiency. The protocol includes a CFD model for activated sludge solids settling and transport which captures the influence of solids...
Author(s)
Randal W. SamstagEdward A. Wicklein
SourceProceedings of the Water Environment Federation
Document typeConference Paper
PublisherWater Environment Federation
Print publication date Oct, 2014
ISSN1938-6478
DOI10.2175/193864714815939453
Volume / Issue2014 / 13
Content sourceWEFTEC
Copyright2014
Word count207

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Description: W14-Proceedings
A Protocol for Optimization of Activated Sludge Mixing
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Description: W14-Proceedings
A Protocol for Optimization of Activated Sludge Mixing
Abstract
The paper outlines a protocol for comprehensive evaluation of mixing devices for activated sludge tanks using field testing for calibration of computational fluid dynamic (CFD) modeling to compare the impacts of tank and mixing device geometry on mixing and energy efficiency. The protocol includes a CFD model for activated sludge solids settling and transport which captures the influence of solids concentration gradients on fluid motion. This element of the protocol is unique in that almost all analyses completed to date for activated sludge biokinetic modeling or mixing have assumed either 1) complete mixing or 2) neutral density CFD. The protocol has been applied to date to several types of mixing devices including jet aeration and mixing, horizontal shaft propeller mixers, and diffused aeration. Field testing of several other types of mixing devices has also been accomplished. The protocol is recommended to optimize design and application of mixing devices for activated sludge service in aerated, anoxic, and anaerobic tanks as part of biological treatment processes. The approach can be extended to incorporate biokinetic models that more accurately predict the impact of tank geometry and mixer configuration on treatment efficiency than can be achieved assuming complete mixing or neutral density CFD.
The paper outlines a protocol for comprehensive evaluation of mixing devices for activated sludge tanks using field testing for calibration of computational fluid dynamic (CFD) modeling to compare the impacts of tank and mixing device geometry on mixing and energy efficiency. The protocol includes a CFD model for activated sludge solids settling and transport which captures the influence of solids...
Author(s)
Randal W. SamstagEdward A. Wicklein
SourceProceedings of the Water Environment Federation
Document typeConference Paper
PublisherWater Environment Federation
Print publication date Oct, 2014
ISSN1938-6478
DOI10.2175/193864714815939453
Volume / Issue2014 / 13
Content sourceWEFTEC
Copyright2014
Word count207

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Randal W. Samstag# Edward A. Wicklein. A Protocol for Optimization of Activated Sludge Mixing. Alexandria, VA 22314-1994, USA: Water Environment Federation, 2018. Web. 23 Oct. 2025. <https://www.accesswater.org?id=-282254CITANCHOR>.
Randal W. Samstag# Edward A. Wicklein. A Protocol for Optimization of Activated Sludge Mixing. Alexandria, VA 22314-1994, USA: Water Environment Federation, 2018. Accessed October 23, 2025. https://www.accesswater.org/?id=-282254CITANCHOR.
Randal W. Samstag# Edward A. Wicklein
A Protocol for Optimization of Activated Sludge Mixing
Access Water
Water Environment Federation
December 22, 2018
October 23, 2025
https://www.accesswater.org/?id=-282254CITANCHOR