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Combining jar tests and CFD to investigate the role of local hydrodynamics in flocculation of high-rate activated sludge

Sophie Balemans (UGent) , Siegfried Vlaeminck (UGent) , Laura Zaharova, Leonie Hartog, Usman Rehman and Ingmar Nopens (UGent)
(2019) Watermatex 2019, 10th IWA symposium on Modelling and Integrated Assessment, Abstracts.
Author
Organization
Abstract
High-rate activated sludge systems have a high potential for carbon and energy recovery from wastewater, yet suffer frequently from poor liquid-solid separation due to limitations in the flocculation process. Flocculation is controlled by a combination of prevailing physicochemical and hydrodynamic conditions and is generally optimized using jar tests. However, jar hydrodynamics are often averaged over the entire volume, which can significantly differ from the local conditions. The presented work investigated the impact of local jar hydrodynamics on floc formation for two different jar test configurations using computational fluid dynamics (CFD). The analysis shows that the distribution of local velocity gradients in the jar is highly influenced by the selection of impeller type and speed, and has an important impact on the flocculation process.
Keywords
High-rate activated sludge, sludge settling, flocculation state, Hydrodynamics

Citation

Please use this url to cite or link to this publication:

MLA
Balemans, Sophie, et al. “Combining Jar Tests and CFD to Investigate the Role of Local  Hydrodynamics in Flocculation of High-Rate Activated Sludge.” Watermatex 2019, 10th IWA Symposium on Modelling and Integrated Assessment, Abstracts, 2019.
APA
Balemans, S., Vlaeminck, S., Zaharova, L., Hartog, L., Rehman, U., & Nopens, I. (2019). Combining jar tests and CFD to investigate the role of local  hydrodynamics in flocculation of high-rate activated sludge. In Watermatex 2019, 10th IWA symposium on Modelling and Integrated Assessment, Abstracts. Copenhagen, Denmark.
Chicago author-date
Balemans, Sophie, Siegfried Vlaeminck, Laura Zaharova, Leonie Hartog, Usman Rehman, and Ingmar Nopens. 2019. “Combining Jar Tests and CFD to Investigate the Role of Local  Hydrodynamics in Flocculation of High-Rate Activated Sludge.” In Watermatex 2019, 10th IWA Symposium on Modelling and Integrated Assessment, Abstracts.
Chicago author-date (all authors)
Balemans, Sophie, Siegfried Vlaeminck, Laura Zaharova, Leonie Hartog, Usman Rehman, and Ingmar Nopens. 2019. “Combining Jar Tests and CFD to Investigate the Role of Local  Hydrodynamics in Flocculation of High-Rate Activated Sludge.” In Watermatex 2019, 10th IWA Symposium on Modelling and Integrated Assessment, Abstracts.
Vancouver
1.
Balemans S, Vlaeminck S, Zaharova L, Hartog L, Rehman U, Nopens I. Combining jar tests and CFD to investigate the role of local  hydrodynamics in flocculation of high-rate activated sludge. In: Watermatex 2019, 10th IWA symposium on Modelling and Integrated Assessment, Abstracts. 2019.
IEEE
[1]
S. Balemans, S. Vlaeminck, L. Zaharova, L. Hartog, U. Rehman, and I. Nopens, “Combining jar tests and CFD to investigate the role of local  hydrodynamics in flocculation of high-rate activated sludge,” in Watermatex 2019, 10th IWA symposium on Modelling and Integrated Assessment, Abstracts, Copenhagen, Denmark, 2019.
@inproceedings{8644471,
  abstract     = {{High-rate activated sludge systems have a high potential for carbon and energy recovery from wastewater, yet suffer frequently from poor liquid-solid separation due to limitations in the flocculation process. Flocculation is controlled by a combination of prevailing physicochemical and hydrodynamic conditions and is generally optimized using jar tests. However, jar hydrodynamics are often averaged over the entire volume, which can significantly differ from the local conditions. The presented work investigated the impact of local jar hydrodynamics on floc formation for two different jar test configurations using computational fluid dynamics (CFD). The analysis shows that the distribution of 
local velocity gradients in the jar is highly influenced by the selection of impeller type and speed, and 
has an important impact on the flocculation process.}},
  author       = {{Balemans, Sophie and Vlaeminck, Siegfried and Zaharova, Laura and Hartog, Leonie and Rehman, Usman and Nopens, Ingmar}},
  booktitle    = {{Watermatex 2019, 10th IWA symposium on Modelling and Integrated Assessment, Abstracts}},
  keywords     = {{High-rate activated sludge,sludge settling,flocculation state,Hydrodynamics}},
  language     = {{eng}},
  location     = {{Copenhagen, Denmark}},
  title        = {{Combining jar tests and CFD to investigate the role of local  hydrodynamics in flocculation of high-rate activated sludge}},
  url          = {{https://iwa-network.org/events/10th-iwa-symposium-on-modelling-and-integrated-assessment/}},
  year         = {{2019}},
}