Piano Key Weir as overflow on sedimentation basin of wastewater treatment plant

Dorthe, David (School of Engineering and Architecture (HEIA-FR), HES-SO // University of Applied Sciences Western Switzerland) ; Pfister, Michael (School of Engineering and Architecture (HEIA-FR), HES-SO // University of Applied Sciences Western Switzerland)

Numerical simulations documented in literature and experiences with driftwood blockage suggested that the flow field upstream of Piano Key Weirs (PKWs) includes an active zone reaching far down near of the weir. In other words, a pronounced vertical upwards-oriented flow active along the weir front presumably occurs, in contrast to a standard overfall. An extended flow field is related to relatively low velocities with a reduced particle transport capacity. This capacity is of interest for sedimentation basins (settling tanks) of wastewater treatment plants. If the particle re-suspension capacity is reduced under similar unit discharges, then either the basin volume can be lessened or the efficiency of the basin augments for the same volume. The paper presents preliminary numerical simulations of the flow velocity distribution in sedimentation basins near both, a sharp-crested weir and a PKW as overfall. Further, some preliminary physical model tests are presented, giving indications about the re-suspension potential of particles, as a function of their vicinity to the weir crest and the unit discharge.


Faculty:
Ingénierie et Architecture
School:
HEIA-FR
Institute:
iTEC - Institut des technologies de l'environnement construit
Publisher:
London, CRC Press
Date:
2017-06
London
CRC Press
Pagination:
pp. 175-184
Published in:
Labyrinth and Piano Key Weirs III – PKW 2017 ; Proceedings of the 3rd International Workshop on Labyrinth and Piano Key Weirs (PKW 2017), 22-24 February 2017, Qui Nhon, Vietnam
Author of the book:
Erpicum, Sébastien ; ed.
Laugier, Frédéric ; ed.
Ho Ta Khanh, Michel ; ed.
Pfister, Michael ; School of Engineering and Architecture (HEIA-FR), HES-SO // University of Applied Sciences Western Switzerland
ISBN:
9781138050105
Appears in Collection:

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 Record created 2021-05-21, last modified 2021-05-28

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