How to Obtain Better Performance from an SST by Exploiting the Sludge Blanket Momentum Preservation
In static conditions, the only mechanism available for sludge/water separation is sludge sedimentation by gravity. In dynamic conditions an additional mechanism is available: sludge momentum preservation. In order to achieve a better understanding of the operation of a secondary sedimentation tank (...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-03-01
|
| Series: | Environmental Sciences Proceedings |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2673-4931/21/1/94 |
| _version_ | 1797580138265706496 |
|---|---|
| author | Lucio Pezza Beatrice Majone |
| author_facet | Lucio Pezza Beatrice Majone |
| author_sort | Lucio Pezza |
| collection | DOAJ |
| description | In static conditions, the only mechanism available for sludge/water separation is sludge sedimentation by gravity. In dynamic conditions an additional mechanism is available: sludge momentum preservation. In order to achieve a better understanding of the operation of a secondary sedimentation tank (SST), the authors analyzed the behavior of the sludge blanket (taking note of the concentration in vertical and horizontal directions) and how it relates to the hydrodynamic fields within the SST. These findings have been interpreted based on hydrodynamic principles: momentum preservation, in case of any energy loss; motion of fluids from an area with higher potential energy to an area with lower potential energy; and the ratio between inertia and gravity forces. The results indicated that the sludge blanket momentum is a parameter of great importance for understanding the behavior of an SST. According to these principles, a longitudinal flow rectangular clarifier has been converted into a transverse flow clarifier, obtaining considerable improvement in operating performance. Moreover, it should be noted that there are already design strategies based on the optimization of water/sludge different momentum as a mechanism to improve the performances of a secondary clarifier. Peripheral feeding in the circular decanter; perforated baffles installed on a rectangular decanter; and the distance to be maintained between the bottom wall of a rectangular SST and the clarified water collection channel are all design strategies explained on the basis of the different sludge/water momentum rather than solid flux theory. |
| first_indexed | 2024-03-10T22:47:03Z |
| format | Article |
| id | doaj.art-333f5dfffa5442e6a179e6453feac995 |
| institution | Directory Open Access Journal |
| issn | 2673-4931 |
| language | English |
| last_indexed | 2024-03-10T22:47:03Z |
| publishDate | 2023-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Environmental Sciences Proceedings |
| spelling | doaj.art-333f5dfffa5442e6a179e6453feac9952023-11-19T10:38:05ZengMDPI AGEnvironmental Sciences Proceedings2673-49312023-03-012119410.3390/environsciproc2022021094How to Obtain Better Performance from an SST by Exploiting the Sludge Blanket Momentum PreservationLucio Pezza0Beatrice Majone1IDEA srl, Via Angelo Emo 144, 00136 Roma, ItalyStudio Majone, Via Inama 7, 20133 Milano, ItalyIn static conditions, the only mechanism available for sludge/water separation is sludge sedimentation by gravity. In dynamic conditions an additional mechanism is available: sludge momentum preservation. In order to achieve a better understanding of the operation of a secondary sedimentation tank (SST), the authors analyzed the behavior of the sludge blanket (taking note of the concentration in vertical and horizontal directions) and how it relates to the hydrodynamic fields within the SST. These findings have been interpreted based on hydrodynamic principles: momentum preservation, in case of any energy loss; motion of fluids from an area with higher potential energy to an area with lower potential energy; and the ratio between inertia and gravity forces. The results indicated that the sludge blanket momentum is a parameter of great importance for understanding the behavior of an SST. According to these principles, a longitudinal flow rectangular clarifier has been converted into a transverse flow clarifier, obtaining considerable improvement in operating performance. Moreover, it should be noted that there are already design strategies based on the optimization of water/sludge different momentum as a mechanism to improve the performances of a secondary clarifier. Peripheral feeding in the circular decanter; perforated baffles installed on a rectangular decanter; and the distance to be maintained between the bottom wall of a rectangular SST and the clarified water collection channel are all design strategies explained on the basis of the different sludge/water momentum rather than solid flux theory.https://www.mdpi.com/2673-4931/21/1/94sludge blanketsolid fluxSST operation |
| spellingShingle | Lucio Pezza Beatrice Majone How to Obtain Better Performance from an SST by Exploiting the Sludge Blanket Momentum Preservation Environmental Sciences Proceedings sludge blanket solid flux SST operation |
| title | How to Obtain Better Performance from an SST by Exploiting the Sludge Blanket Momentum Preservation |
| title_full | How to Obtain Better Performance from an SST by Exploiting the Sludge Blanket Momentum Preservation |
| title_fullStr | How to Obtain Better Performance from an SST by Exploiting the Sludge Blanket Momentum Preservation |
| title_full_unstemmed | How to Obtain Better Performance from an SST by Exploiting the Sludge Blanket Momentum Preservation |
| title_short | How to Obtain Better Performance from an SST by Exploiting the Sludge Blanket Momentum Preservation |
| title_sort | how to obtain better performance from an sst by exploiting the sludge blanket momentum preservation |
| topic | sludge blanket solid flux SST operation |
| url | https://www.mdpi.com/2673-4931/21/1/94 |
| work_keys_str_mv | AT luciopezza howtoobtainbetterperformancefromansstbyexploitingthesludgeblanketmomentumpreservation AT beatricemajone howtoobtainbetterperformancefromansstbyexploitingthesludgeblanketmomentumpreservation |