CA3161046A1 - Hydrodynamic separator - Google Patents

Abstract

A hydrodynamic separator comprising a vortex comprising a first peripheral wall, a second peripheral wall, a top peripheral end portion defining an inlet vortex opening in fluid communication with an inlet separator opening and a bottom peripheral wall defining an outlet vortex opening in fluid communication with a first aperture for allowing flow of stormwater from the inlet separator opening to a bottom chamber, a dividing wall, and a tube in a first area of the top chamber between the second peripheral wall of the vortex and the dividing wall, the bottom peripheral wall of the tube defining an inlet tube opening in fluid communication with a second aperture and the top peripheral wall of the tube defining an outlet tube opening in fluid communication with the first area of the top chamber for allowing flow of stormwater from the bottom chamber to the first area of the top chamber.

Description

HYDRODYNAMIC SEPARATOR
FIELD
The present disclosure relates to a hydrodynamic separator comprising a top chamber, a bottom chamber, inlet and outlet separator openings, a vortex for allowing flow of stormwater from the inlet separator opening to the bottom chamber and for removing particles from the stormwater by swirling motion and gravitation and for collecting the particles in the bottom chamber, a dividing wall in the top chamber between the vortex .. and the peripheral wall of the hydrodynamic separator, wherein the dividing wall divides the top chamber in a first area adapted to retain oils and grease and a second area in fluid communication with the outlet separator opening, and a tube in the first area of the top chamber between the vortex and the dividing wall, wherein the top peripheral wall of the tube is located above the bottom end of the dividing wall.
BACKGROUND
As it is well known in the art, a hydrodynamic separator treats stormwater primarily by using gravity to remove settleable particles and phase separation to remove buoyant materials (free oils and grease) from the water. The hydrodynamic separator does not attenuate flows because its components have minimal detention storage. As a result, hydrodynamic separators are considered appropriate when used in combination with water quantity control technologies, or as a stand alone at sites where water quantity control is not required.
The separator my include by-pass features, swirl action, screening action, and coalescence action. The by-pass features allow only low flows to be treated while high flows by-pass the treatment chamber (e.g. vortex). This prevents the re-suspension of particles in the water that may be brought about during turbulence associated with high inflows. The swirl action feature allows stormwater to enter the top chamber of the separator on a tangent to the treatment chamber (e.g. vortex) that promotes a swirling Date Recue/Date Received 2022-05-31 motion. Sediments are removed by gravity and deposited at the bottom of the bottom chamber.
Separators with screening action employ specially designed screens to remove solids from stormwater. Flow direction is tangential to the screen surface and the screen allows water to pass through while solids are retained on the inside. Further settling of solids is achieved as flow velocities are reduced as water passes through the screen.
Coalescence action units may comprise a series of parallel plates usually positioned at an angle to the direction of flow. Small oil droplets suspended in the water cohere to the surface of the plates, and as oil accumulates, large drops eventually break away from the plate surface and float to the water surface where they are trapped.
US Patent 7,182,874 discloses an assembly unit for treating stormwater. The unit comprises a pass-through member, having an inlet, an outlet and a longitudinal axis. The unit also comprises a first vortex separator located between the inlet and the outlet. The first vortex separator comprises a first hollow cylindrical wall open at both ends and disposed transversely relative to the longitudinal axis of the pass-through member. The first wall comprises an inner surface and an outer surface The unit also comprises a first transport passageway in fluid communication the pass-through member and the first vortex separator. The transport passageway is disposed to direct stormwater flow tangentially to the inner surface of the first wall.
The unit further comprises a first weir positioned within the pass-through member downstream of the first transport passageway to direct low stormwater flow via the transport passageway to the vortex separator.
The unit also comprises a second vortex separator located between the inlet and outlet.
The second vortex separator comprises a second hollow cylindrical wall open at both ends and disposed transversely relative to the longitudinal axis of the pass-through member. The second wall comprises an inner surface and an outer surface.

2 Date Recue/Date Received 2022-05-31 The unit further comprises a second transport passageway in fluid communication with the pass-through member and the second vortex separator. The second transport passageway is disposed to direct stormwater flow tangentially to the inner surface of the second wall.
The unit also comprises a second weir downstream of both the first weir and the second transport passageway, the second weir being larger than the first weir, to direct a high flow of stormwater via the second transport passageway to the second vortex separator.
In use, the water enters the manhole basin through the drain inlet opening and the water is diverted by the first weir to the vortex separator. The water in the separator is circulated downwardly along the perimeter wall towards the reservoir. The hydrostatic forces direct the exited flow upwardly through the first forward opening in the central platform, over the forward baffle to exit at the base of the retention baffle via the underflow opening for discharging through outlet opening into the continuation of the drainage system. The top end of the forward baffle is higher that the underflow opening defined in the bottom of the retention baffle.
The system thus comprises a first baffle on one side and a second baffle on the other side of the upper chamber of the unit. The first baffle allows passage of water from the lower chamber to the upper chamber and the second baffle allows passage of water from the upper chamber to the outlet of the unit. The upper end of the first baffle is above the opening defined by the second baffle, this opening being in fluid communication with the outlet of the unit.
Against the drawbacks of the prior art, there is a need to provide a hydrodynamic separator wherein stormwater flows in the inlet pipe and through the inlet separator opening, then flows through the vortex, for removing particles from the stormwater by swirling motion and gravitation and for collecting the particles in the bottom chamber, and then flows into the bottom chamber, stormwater partially devoid of particles flows from

3 Date Recue/Date Received 2022-05-31 the bottom chamber through the tube, and then flows in the first area of the upper chamber wherein oils and grease are retained, stormwater partially devoid of particles, oils and grease flows under the bottom end of the dividing wall, and then through the outlet separator opening and in the outlet pipe. There is also a need to provide a hydrodynamic separator wherein, stormwater flows in the inlet pipe and through the inlet separator opening, and wherein above a predetermined surface loading rate, a first stream of the stormwater flows through the vortex, for removing particles from the stormwater first stream by swirling motion and gravitation and for collecting the particles in the bottom chamber, and then flows into the bottom chamber and a second stream of the stormwater flows over the second top end of the second peripheral wall of the vortex in the first area of the upper chamber wherein oils and grease are retained, stormwater first steam partially devoid of particles flows from the bottom chamber through the tube, and then flows in the first area of the upper chamber wherein oils and grease are retained, and stormwater first steam partially devoid of particles, oils and grease and stormwater second steam partially devoid of particles, oils and grease flow under the bottom end of the dividing wall, and then through the outlet separator opening and in the outlet pipe.
Moreover, there is a need to provide a hydrodynamic separator having improved average removal efficiencies.
SUMMARY
According to a broad aspect, there is provided a hydrodynamic separator extending generally along a longitudinal axis, the hydrodynamic separator comprising: a top wall, a bottom wall and a peripheral wall extending along the longitudinal axis between the top and bottom walls for defining top and bottom chambers, the top and bottom chambers being separated by a separating wall extending transversally relative to the longitudinal axis, the separating wall comprising a top surface and first and second apertures; the peripheral wall defining an inlet separator opening at a first side of the hydrodynamic separator and an outlet separator opening at a second side of the hydrodynamic separator; an inlet pipe at the first side of the hydrodynamic separator, the inlet pipe being in fluid communication with the inlet separator opening for allowing flow of stormwater in

4 Date Recue/Date Received 2022-05-31 the hydrodynamic separator; an outlet pipe at the second side of the hydrodynamic separator, the outlet pipe being in fluid communication with the outlet separator opening for allowing flow of stormwater outside the hydrodynamic separator; a vortex in the top chamber, the vortex comprising a first peripheral wall extending along the longitudinal axis, a second peripheral wall extending along the longitudinal axis, a top peripheral end portion defining an inlet vortex opening in fluid communication with the inlet separator opening and a bottom peripheral wall defining an outlet vortex opening in fluid communication with the first aperture for allowing flow of stormwater from the inlet separator opening to the bottom chamber; a dividing wall in the top chamber between the vortex and the peripheral wall of the hydrodynamic separator, the dividing wall extending along the longitudinal axis from a bottom end to a top end, the bottom end of the dividing wall being spaced from the top surface of the separating wall, wherein the first peripheral wall of the vortex and the dividing wall divide the top chamber in a first area adapted to retain oils and grease and a second area in fluid communication with the outlet separator opening; and a tube in the first area of the top chamber between the second peripheral wall of the vortex and the dividing wall and extending generally along the longitudinal axis from a bottom peripheral wall to a top peripheral wall, the bottom peripheral wall of the tube defining an inlet tube opening in fluid communication with the second aperture and the top peripheral wall of the tube defining an outlet tube opening in fluid communication with the first area of the top chamber for allowing flow of stormwater from the bottom chamber to the first area of the top chamber, wherein the top peripheral wall of the tube is located above the bottom end of the dividing wall; wherein (i) stormwater flows in the inlet pipe and through the inlet separator opening, then flows through the vortex, for removing particles from the stormwater by swirling motion and gravitation and for collecting the particles in the bottom chamber, and then flows into the bottom chamber, (ii) stormwater partially devoid of particles flows from the bottom chamber through the tube, and then flows in the first area of the upper chamber wherein oils and grease are retained, and (iii) stormwater partially devoid of particles, oils and grease flows under the bottom end of the dividing wall, and then through the outlet separator opening and in the outlet pipe.

5 Date Recue/Date Received 2022-05-31 According to a broad aspect, there is provided a hydrodynamic separator extending generally along a longitudinal axis, the hydrodynamic separator comprising: a top wall, a bottom wall and a peripheral wall extending along the longitudinal axis between the top and bottom walls for defining top and bottom chambers, the top and bottom chambers being separated by a separating wall extending transversally relative to the longitudinal axis, the separating wall comprising a top surface and first and second apertures; the peripheral wall defining an inlet separator opening at a first side of the hydrodynamic separator and an outlet separator opening at a second side of the hydrodynamic separator; an inlet pipe at the first side of the hydrodynamic separator, the inlet pipe being in fluid communication with the inlet separator opening for allowing flow of stormwater in the hydrodynamic separator; an outlet pipe at the second side of the hydrodynamic separator, the outlet pipe being in fluid communication with the outlet separator opening for allowing flow of stormwater outside the hydrodynamic separator; a vortex in the top chamber, the vortex comprising a first peripheral wall extending along the longitudinal axis from a first bottom end to a first top end, a second peripheral wall extending along the longitudinal axis from a second bottom end to a second top end, a top peripheral end portion defining an inlet vortex opening in fluid communication with the inlet separator opening and a bottom peripheral wall defining an outlet vortex opening in fluid communication with the first aperture for allowing flow of stormwater from the inlet separator opening to the bottom chamber, wherein the first top end of the first peripheral wall of the vortex is at a first vortex distance from a bottom of the top wall, and wherein the second top end of the second peripheral wall of the vortex is at a second vortex distance from the bottom of the top wall, the second vortex distance being greater than the first vortex distance such that the second top end of the second peripheral wall of the vortex is lower than the first top end of the first peripheral wall; a dividing wall in the top chamber between the vortex and the peripheral wall of the hydrodynamic separator, the dividing wall extending along the longitudinal axis from a bottom end to a top end, the bottom end of the dividing wall being spaced from the top surface of the separating wall, wherein the first peripheral wall of the vortex and the dividing wall divide the top chamber -- in a first area adapted to retain oils and grease and a second area in fluid communication with the outlet separator opening, and wherein the top end of the dividing wall is at a

6 Date Recue/Date Received 2022-05-31 dividing wall distance from the bottom of the top wall that generally corresponds to the first vortex distance; and a tube in the first area of the top chamber between the second peripheral wall of the vortex and the dividing wall and extending generally along the longitudinal axis from a bottom peripheral wall to a top peripheral wall, the bottom peripheral wall of the tube defining an inlet tube opening in fluid communication with the second aperture and the top peripheral wall of the tube defining an outlet tube opening in fluid communication with the first area of the top chamber for allowing flow of stormwater from the bottom chamber to the first area of the top chamber, wherein the top peripheral wall of the tube is located above the bottom end of the dividing wall;
wherein, stormwater flows in the inlet pipe and through the inlet separator opening, and wherein, above a predetermined surface loading rate (i) a first stream of the stormwater flows through the vortex, for removing particles from the stormwater first stream by swirling motion and gravitation and for collecting the particles in the bottom chamber, and then flows into the bottom chamber and a second stream of the stormwater flows over the second top end of the second peripheral wall of the vortex in the first area of the upper chamber wherein oils and grease are retained; (ii) stormwater first steam partially devoid of particles flows from the bottom chamber through the tube, and then flows in the first area of the upper chamber wherein oils and grease are retained; and (iii) stormwater first steam partially devoid of particles, oils and grease and stormwater second steam partially devoid of particles, oils and grease flow under the bottom end of the dividing wall, and then through the outlet separator opening and in the outlet pipe.
These and other aspects of the invention will now become apparent to those of ordinary skill in the art upon review of the following description of embodiments of the invention in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
A detailed description of the embodiments of the present invention is provided herein below, by way of example only, with reference to the accompanying drawings, in which:

7 Date Recue/Date Received 2022-05-31 Figure 1 is a perspective view of a hydrodynamic separator in accordance with an embodiment;
Figure 2 is a first reduced exploded view of the hydrodynamic separator of Figure 1;
Figure 3 is a second exploded view of the hydrodynamic separator of Figure 1;
Figure 4 is a third exploded view of the hydrodynamic separator of Figure 1;
Figure 5 is a fourth exploded view of the hydrodynamic separator of Figure 1;
Figure 6 is an enlarged perspective view of a portion of the separating wall, the dividing wall and the vortex comprising a first peripheral wall and a second peripheral wall, wherein the first top end of the first peripheral wall of the vortex is higher than the second top end of the second peripheral wall of the vortex;
Figure 7 is a cross-sectional view taken along line 7-7 in Figure 6;
Figure 8 is a first perspective view of the hydrodynamic separator of Figure 1, with external components shown transparent to better show the internal components;
Figure 9 is a second perspective view of the hydrodynamic separator of Figure

8;
Figure 10 is a third perspective view of the hydrodynamic separator of Figure 8;
Figure 11 is a fourth perspective view of the hydrodynamic separator of Figure 8;
Figure 12 is a first perspective view of the hydrodynamic separator of Figure 1, with external components shown transparent to better show the internal components, and with arrows showing the stream of the stormwater passing in the hydrodynamic separator;

Date Recue/Date Received 2022-05-31 Figure 13 is a second perspective view of the hydrodynamic separator of Figure 12;
Figure 14 is a third perspective view of the hydrodynamic separator of Figure 12;
Figure 15 is a fourth perspective view of the hydrodynamic separator of Figure 12;
Figure 16 is a first perspective view of the hydrodynamic separator of Figure 1, with external components shown transparent to better show the internal components, and with arrows showing first and second streams of the stormwater passing in the hydrodynamic separator;
Figure 17 is a second perspective view of the hydrodynamic separator of Figure 16;
Figure 18 is a third perspective view of the hydrodynamic separator of Figure 16; and Figure 19 is a fourth perspective view of the hydrodynamic separator of Figure 16.
DETAILED DESCRIPTION OF EMBODIMENTS
In the following description, the same numerical references refer to similar elements.
Furthermore, for the sake of simplicity and clarity, namely so as to not unduly burden the figures with several reference numbers, not all figures contain references to all the components and features, and references to some components and features may be found in only one figure, and components and features of the present disclosure which are illustrated in other figures can be easily inferred therefrom. The embodiments, geometrical configurations, materials mentioned and/or dimensions shown in the figures are optional and are given for exemplification purposes only.
Moreover, it will be appreciated that positional descriptions such as "above", "below", "forward", "rearward", "left", "right" and the like should, unless otherwise indicated, be taken in the context of the figures only and should not be considered limiting. The use of

9 Date Recue/Date Received 2022-05-31 "including," "comprising," or "having" and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional suitable items.
Unless specified or limited otherwise, the terms "mounted," "connected,"
"supported," and "coupled" and variations thereof are used broadly and encompass both direct and indirect mountings, connections, supports, and couplings and are thus intended to include direct connections between two members without any other members interposed therebetween and indirect connections between members in which one or more other members are interposed therebetween. Further, "connected" and "coupled" are not restricted to physical or mechanical connections or couplings. Additionally, the words "lower", "upper", "upward", "down" and "downward" designate directions in the drawings to which reference is made.
To provide a more concise description, some of the quantitative expressions given herein may be qualified with the term "about". It is understood that whether the term "about" is used explicitly or not, every quantity given herein is meant to refer to an actual given value, and it is also meant to refer to the approximation to such given value that would reasonably be inferred based on the ordinary skill in the art, including approximations due to the experimental and/or measurement conditions for such given value.
It is to be understood that the phraseology and terminology employed herein is not to be construed as limiting and are for descriptive purpose only. The principles and uses of the teachings of the present disclosure may be better understood with reference to the accompanying description, figures and examples. It is to be understood that the details set forth herein do not construe a limitation to an application of the disclosure.
Furthermore, it is to be understood that where the claims or specification refer to "a" or "an" element, such reference is not be construed that there is only one of that element. It is to be understood that where the specification states that a component, feature, structure, or characteristic "may", "might", "can" or "could" be included, that particular component, feature, structure, or characteristic is not required to be included.
Date Recue/Date Received 2022-05-31 Variants, examples and preferred embodiments of the invention are described hereinbelow.
Figures 1 show a hydrodynamic separator 10 extending generally along a longitudinal axis LA-LA, Figures 2 to 5 are reduced exploded view of the hydrodynamic separator 10, Figures 8 and 11 are perspective views of the hydrodynamic separator 10, with external components shown transparent to better show the internal components, Figures 12 to 15 are perspective views of the hydrodynamic separator 10, with external components shown transparent to better show the internal components, and with arrows showing the stream of the stormwater passing in the hydrodynamic separator 10, and Figure 16 to 19 are perspective views of the hydrodynamic separator 10, with external components shown transparent to better show the internal components, and with arrows showing first and second streams of the stormwater passing in the hydrodynamic separator 10.
The hydrodynamic separator comprises a top wall 12, a bottom wall 14 and a peripheral wall 16 extending along the longitudinal axis LA-LA between the top and bottom walls 12, 14 for defining a top chamber 18 and a bottom chamber 20 (as illustrated in Figures 8 and 10). While the top wall 12 is shown with an aperture, it is understood that such aperture is adapted to receive a base frame and/or a cover such as a street or parking cover or a manhole cover.
The top and bottom chambers 18, 20 are separated by a separating wall 22 extending transversally relative to the longitudinal axis LA-LA.
The separating wall 22 comprises a top surface 23, a first aperture 24 and a second aperture 26.
The peripheral wall 16 defines an inlet separator opening 28 at a first side of the hydrodynamic separator 10 and an outlet separator opening 30 at a second side of the hydrodynamic separator.

Date Recue/Date Received 2022-05-31 The hydrodynamic separator 10 also comprises an inlet pipe 32 at the first side of the hydrodynamic separator, 10 the inlet pipe being in fluid communication with the inlet separator opening 28 for allowing flow of stormwater in the hydrodynamic separator 10 and an outlet pipe 34 at the second side of the hydrodynamic separator 10, the outlet pipe 34 being in fluid communication with the outlet separator opening 30 for allowing flow of stormwater outside the hydrodynamic separator 10.
The inlet pipe extends along a transversal inlet axis and the outlet pipe extends along a transversal outlet pipe both extending transversally relative to the longitudinal axis LA-LA
and intersecting the longitudinal axis such that the inlet separator opening 28 is opposite to the outlet separator opening 30.
As best seen in Figures 9 and 11, the transversal inlet pipe axis is at an inlet pipe distance IPD relative to the top wall 12 of the hydrodynamic separator 10 and the transversal outlet pipe axis is at an outlet pipe distance OPD relative to the top wall 12 of the hydrodynamic separator 10, the outlet pipe distance OPD may be greater than the inlet pipe distance IPD. In different embodiments, the difference between the outlet pipe distance OPD and the inlet pipe distance IPD may be between about 65 mm and about 85 mm, or about 70 mm and about 80 mm, or about 75 mm.
Moreover, the hydrodynamic separator 10 comprises a vortex 36 in the top chamber 18.
Referring to Figures 6 and 7, the vortex 36 comprising a top peripheral end portion 38 defining an inlet vortex opening 40 in fluid communication with the inlet separator opening 28 and a bottom peripheral wall 42 defining an outlet vortex opening 44 in fluid communication with the first aperture 24 for allowing flow of stormwater from the inlet separator opening 28 to the bottom chamber 20.
The vortex 36 has a frustoconical portion 46 (shown in broken lines in Figure 7) with the top peripheral end portion 38 defining a first vortex diameter VD1 and the bottom peripheral end 42 defining a second vortex diameter VD2, the first diameter VD1 being greater than the second diameter VD2.

Date Recue/Date Received 2022-05-31 In different embodiments, the ratios of the first vortex diameter VD1 of the top peripheral end 38 of the frustoconical portion 46 relative to the second vortex diameter VD2 of the bottom peripheral end 42 of the frustoconical portion 46 are about 380:200, 510:270, 635:340, 760:405, 890:475, 1015:540, 1125:600, or 1250:665.
In different embodiments, the frustoconical portion 46 of the vortex 36 may define an angle between about 75 and about 85 or between about 79 and about 81 .
As shown in Figures 3, 4 and 6, the vortex 36 also comprises a first peripheral wall 48 extending along the longitudinal axis from a first bottom end 50 to a first top end 52 and a second peripheral wall 54 extending along the longitudinal axis from a second bottom end 56 to a second top end 58.
As shown in Figures 1, 8, 9 and 11, the first top end 52 of the first peripheral wall 48 of the vortex 36 is at a first vortex distance Di from a bottom 13 of the top wall 12 and the second top end 58 of the second peripheral wall 54 of the vortex 36 is at a second vortex distance D2 from the bottom 13 of the top wall 12.
The second vortex distance D2 is greater than the first vortex distance Di such that the second top end 58 of the second peripheral wall 54 of the vortex 36 is lower than the first top end 52 of the first peripheral wall 48.
The hydrodynamic separator 10 also comprises a dividing wall 60 in the top chamber 18 between the vortex and the peripheral wall 16 of the hydrodynamic separator.
As shown in Figures 3, 4 and 6, the dividing wall 60 extends along the longitudinal axis from a bottom end 62 to a top end 64.
As shown in Figures 6, 8 and 9, the top end 64 of the dividing wall 60 is at a dividing wall distance D3 from the bottom 13 of the top wall 12 that generally corresponds to the first vortex distance Di and the bottom end 62 of the dividing wall 60 is spaced from the top Date Recue/Date Received 2022-05-31 surface 23 of the separating wall 22 of a distance D4. The distance D4 may be between about 200 mm and about 670 mm.
Referring to Figures 12, 13 and 14, the first peripheral wall 48 of the vortex 36 and the dividing wall 60 divides the top chamber 18 in a first area 66 adapted to retain oils and grease and a second area 68 in fluid communication with the outlet separator opening 30.
In one embodiment, the frustoconical portion 46 of the vortex 36 and the first aperture 24 extend along a first axis parallel to the longitudinal axis LA-LA and intersecting the inlet and outlet pipe axes. Moreover, the second aperture 26 extends along a second axis parallel to the longitudinal axis LA-LA.
In one embodiment, the dividing wall 60 defines an angle e between about 25 and about 35 or an angle of about 30 relative to the axis of the outlet pipe 34 as shown in Figure 11.
The first top end 52 of the first peripheral wall 48 of the vortex 36 is located well above the bottom end 62 of the dividing wall 60. For proportions of 1.00, 1.33, 1.67, 2.00, 2.34, 2.67, 2.95 and 3.28, differences of heights between the top peripheral wall of the tube and the bottom end of the dividing wall may be: 792 mm, 1063 mm, 1328 mm, 1594 mm, 1863 mm, 2125 mm, 2351 mm and 2612 mm.
Furthermore, the hydrodynamic separator 10 comprises a tube 70 in the first area 66 of the top chamber 18 between the second peripheral wall 54 of the vortex 36 and the dividing wall 60 and extending generally along the longitudinal axis LA-LA
from a bottom peripheral wall 72 to a top peripheral wall 74.
Referring to Figures 8 and 9, the bottom peripheral wall 72 of the tube defines an inlet tube opening 76 that is in fluid communication with the second aperture 26 of the separating wall 22 and the top peripheral wall 74 of the tube 70 defining an outlet tube 78 Date Recue/Date Received 2022-05-31 opening that is in fluid communication with the first area 66 of the top chamber 18 for allowing flow of stormwater from the bottom chamber 20 to the first area 66 of the top chamber 18.
The top peripheral wall 74 of the tube 70 is located above the bottom end 62 of the dividing wall 60. For proportions of 1.00, 1.33, 1.67, 2.00, 2.34, 2.67, 2.95 and 3.28, differences of heights between the top peripheral wall of the tube and the bottom end of the dividing wall may be: 44 mm, 125 mm, 210 mm, 291 mm, 375 mm, 458 mm, 526 mm and 607 mm.
The hydrodynamic separator may also comprise a deflecting wall 80 between the inlet opening 28 of the hydrodynamic separator 10 and the inlet vortex opening 40.
The deflecting wall 80 may define an angle between about 15 and about 45 relative to an axis parallel to the longitudinal axis LA-LA. The deflecting wall 80 has a width and a length. The inlet pipe 32 has an inlet pipe diameter and the length of the deflector 80 is between about 80% and about 100% of the inlet pipe diameter. The deflecting wall 80 may have left and right flanges or projections extending therefrom and contacting internal portions of the first and second peripheral walls 48, 54 for mounting the deflecting wall 80 to the vortex 36. In one example, the deflecting wall 80 may be pivotably mounted to the vortex 36 for adjusting the angle of the deflecting wall. It is understood that such mounting should allow pivoting movement of the vortex 36 when necessary while offering enough resistance against the stormwater flow to remain the vortex 36 in place.
Referring to Figures 12 to 15, in use, first, the stormwater flows in the inlet pipe 32 and through the inlet separator opening 28, then flows through the vortex 36, for removing particles from the stormwater by swirling motion and gravitation and for collecting the particles in the bottom chamber 20, and then flows into the bottom chamber 20.
Second, stormwater partially devoid of particles flows from the bottom chamber through the tube 70, and then flows in the first area 66 of the upper chamber 18 wherein oils and grease are retained.
Date Recue/Date Received 2022-05-31 Third, stormwater partially devoid of particles, oils and grease flows under the bottom end 62 of the dividing wall 60, and then through the outlet separator opening 30 and in the outlet pipe 34.
The stormwater has a first speed at the vortex inlet opening 40 and a second speed at the vortex outlet opening 44, the first speed may be between about 0.15 m/s and about 0.25 m/s or between about 0.19 m/s and about 0.21 m/s and the second speed may be between about 0.65 m/s and about 0.75 m/s or between about 0.69 m/s and about 0.71 m/s.
The hydrodynamic separator 10 may have an average removal efficiency of between about 75% and about 85% for a surface loading rate between about 0.1 L/s/m2 and about 5 L/s/m2.
In an overflow condition, referring to Figures 16 to 19, in use, the stormwater flows in the inlet pipe 32 and through the inlet separator opening 28, and above a predetermined surface loading rate, first, a first stream of the stormwater flows through the vortex 36, for removing particles from the stormwater first stream by swirling motion and gravitation and for collecting the particles in the bottom chamber 20, and then flows into the bottom chamber 20 and a second stream of the stormwater flows over the second top end 58 of the second peripheral wall 54 of the vortex 36 in the first area of the upper chamber 18 wherein oils and grease are retained.
Second, stormwater first steam partially devoid of particles flows from the bottom chamber 20 through the tube 70, and then flows in the first area 66 of the upper chamber 18 wherein oils and grease are retained.
Third, stormwater first steam partially devoid of particles, oils and grease and stormwater second steam partially devoid of particles, oils and grease flow under the bottom end 62 Date Recue/Date Received 2022-05-31 of the dividing wall 60, and then through the outlet separator opening 30 and in the outlet pipe 34.
The predetermined surface loading rate may be above 35 L/s/m2 or may be between about 35 L/s/m2 and about 45 L/s/m2.
It is understood that a first amount of particles is collected in the bottom chamber and a second amount of particles is collected in the first area of the upper chamber.
The hydrodynamic separator may have the dimensions and features listed in the following table:
Proportion 1.00 1.33 1.67 2.00 2.34 2.67 2.95 3.28 Second chamber diameter 915 1220 1525 1830 2140 2440 2700 3000 (mm) Second chamber height 468 692 915 1139 1366 1586 1777 (mm) First (inlet) vortex diameter 381 508 635 762 891 1016 (mm) Second (outlet) vortex 203 271 338 406 475 541 599 666 diameter (mm) Vortex diameter (mm) 381 533 762 762 914 1067 1219 1372 Vortex height (mm) 500 667 833 1000 1169 1333 1475 Vortex angle (degree) 80 80 80 80 80 80 80 80 Height differences between 792 1063 1328 1594 1863 2125 2351 vortex first wall top and dividing wall bottom (mm) Height differences between 44 125 210 291 375 458 526 607 tube top and dividing wall bottom (mm) Height differences between 203 271 338 406 475 541 599 dividing wall bottom and separating wall top surface Surface charge (L/s/m2) 35 35 35 35 35 35 35 35 Treatment area (m2) 0.6576 1.1690 1.8265 2.6302 3.5968 4.6759 5.72567.0686 Date Recue/Date Received 2022-05-31 Mass flow rate (m3/s) 0.0230 0.0409 0.0639 0.0921 0.1259 0.1637 0.20040.2474 Vortex inlet speed (m/s) 0.2019 0.2019 0.2019 0.2019 0.2019 0.2019 0.20190.2019 Vortex outlet speed (m/s) 0.7111 0.7111 0.7111 0.7111 0.7111 0.7111 0.71110.7111 The hydrodynamic separator may have the following average removal efficiency curve:
100 r Predetermined surface loading rate 40 _________________________________________ g E
20 ________________________________________________ 4 OC

0 ________________________________________________ ¨

Surface Loading Rate (Lis/m2) 5 The above description of the variants, examples or embodiments should not be interpreted in a limiting manner since other variations, modifications and refinements are possible within the scope of the present invention. Accordingly, it should be understood that various features and aspects of the disclosed variants or embodiments can be combined with or substituted for one another in order to form varying modes of the

10 disclosed invention. For example, and without limitation, any individual element of the described variants or embodiments may be replaced by alternative elements that provide substantially similar functionality or otherwise provide adequate operation.
This includes, for example, presently known alternative elements, such as those that might be currently known to a skilled person in the art, and alternative elements that may be developed in 15 the future, such as those that a skilled person in the art might, upon development, recognize as an alternative. The scope is defined in the appended claims and their equivalents.

Date Recue/Date Received 2022-05-31

Claims (37)

1.
A hydrodynamic separator extending generally along a longitudinal axis, the hydrodynamic separator comprising:
a top wall, a bottom wall and a peripheral wall extending along the longitudinal axis between the top and bottom walls for defining top and bottom chambers, the top and bottom chambers being separated by a separating wall extending transversally relative to the longitudinal axis, the separating wall comprising a top surface and first and second apertures, the peripheral wall defining an inlet separator opening at a first side of the hydrodynamic separator and an outlet separator opening at a second side of the hydrodynamic separator;
an inlet pipe at the first side of the hydrodynamic separator, the inlet pipe being in fluid communication with the inlet separator opening for allowing flow of stormwater in the hydrodynamic separator;
an outlet pipe at the second side of the hydrodynamic separator, the outlet pipe being in fluid communication with the outlet separator opening for allowing flow of stormwater outside the hydrodynamic separator;
a vortex in the top chamber, the vortex comprising a first peripheral wall extending along the longitudinal axis, a second peripheral wall extending along the longitudinal axis, a top peripheral end portion defining an inlet vortex opening in fluid communication with the inlet separator opening and a bottom peripheral wall defining an outlet vortex opening in fluid communication with the first aperture for allowing flow of stormwater from the inlet separator opening to the bottom chamber;
a dividing wall in the top chamber between the vortex and the peripheral wall of the hydrodynamic separator, the dividing wall extending along the longitudinal axis from a bottom end to a top end, the bottom end of the dividing wall being spaced from the top surface of the separating wall, wherein the first peripheral wall of the vortex and the dividing wall divide the top chamber in a first area adapted to retain oils and grease and a second area in fluid communication with the outlet separator opening; and a tube in the first area of the top chamber between the second peripheral wall of the vortex and the dividing wall and extending generally along the longitudinal axis from a bottom peripheral wall to a top peripheral wall, the bottom peripheral wall of the tube defining an inlet tube opening in fluid communication with the second aperture and the top peripheral wall of the tube defining an outlet tube opening in fluid communication with the first area of the top chamber for allowing flow of stormwater from the bottom chamber to the first area of the top chamber, wherein the top peripheral wall of the tube is located above the bottom end of the dividing wall;
wherein (i) stormwater flows in the inlet pipe and through the inlet separator opening, then flows through the vortex, for removing particles from the stormwater by swirling motion and gravitation and for collecting the particles in the bottom chamber, and then flows into the bottom chamber, (ii) stormwater partially devoid of particles flows from the bottom chamber through the tube, and then flows in the first area of the upper chamber wherein oils and grease are retained, and (iii) stormwater partially devoid of particles, oils and grease flows under the bottom end of the dividing wall, and then through the outlet separator opening and in the outlet pipe.

2. The hydrodynamic separator of claim 1, wherein the vortex has a frustoconical portion with the top peripheral end portion having a first diameter and the bottom peripheral end having a second diameter, the first diameter being greater than the second diameter.

3. The hydrodynamic separator of claim 2, wherein ratios of the first diameter relative to the second diameter are about 380:200, 510:270, 635:340, 760:405, 890:475, 1015:540, 1125:600, or 1250:665.

4. The hydrodynamic separator of claim 3, wherein the vortex has a vortex height between the top and bottom peripheral ends and wherein ratios of the respective first diameter, second diameter, and vortex height are about 380:200:500, 510:270:665, 635:340:835, 760:405:1000, 890:475:1170, 1015:540:1335, 1125:600:1475, or 1250:665:1640.

5. The hydrodynamic separator of any one of claims 2 to 4, wherein the frustoconical portion of the vortex defines an angle between about 75 and about 85 or between about 79 and about 81 .

6. The hydrodynamic separator of any one of claims 1 to 5, wherein the stormwater has a first speed at the vortex inlet opening and a second speed at the vortex outlet opening, the first speed being between about 0.15 m/s and about 0.25 m/s or between about 0.19 m/s and about 0.21 m/s and the second speed being between about 0.65 m/s and about 0.75 m/s or between about 0.69 m/s and about 0.71 m/s.

7. The hydrodynamic separator of any one of claims 1 to 6, comprising a deflecting wall between the inlet opening of the hydrodynamic separator and the inlet vortex opening.

8. The hydrodynamic separator of claim 7, wherein the deflecting wall defines an angle between about 15 and about 45 relative to an axis parallel to the longitudinal axis.

9. The hydrodynamic separator of claim 7 or 8, wherein the inlet pipe has an inlet pipe diameter, wherein the deflecting wall has a width and a length, and wherein the length of the deflector is between about 80% and about 100% of the inlet pipe diameter.

10. The hydrodynamic separator of claim 9, wherein the width of the deflector is between about 80% and about 100% of the inlet pipe diameter.

11. The hydrodynamic separator of any one of claims 1 to 10, wherein the hydrodynamic separator has an average removal efficiency of between about 75%
and about 85% for a surface loading rate between about 0.1 L/s/m2 and about 5 L/s/m2.

12. The hydrodynamic separator of any one of claims 1 to 11, wherein the inlet and outlet pipes extend along transversal inlet and outlet pipe axes extending transversally relative to the longitudinal axis and intersecting the longitudinal axis such that the inlet separator opening is opposite to the outlet separator opening.

13. The hydrodynamic separator of claim 12, wherein the transversal inlet pipe axis is at an inlet pipe distance relative to the top wall of the hydrodynamic separator and wherein the transversal outlet pipe axis is at an outlet pipe distance relative to the top wall of the hydrodynamic separator, the outlet pipe distance being greater than the inlet pipe distance.

14. The hydrodynamic separator of claim 13, wherein a difference between the outlet pipe distance and the inlet pipe distance is between about 70 mm and about 80 mm or about 75 mm.

15. The hydrodynamic separator of any one of claims 12 to 14, wherein the vortex and the first aperture extend along a first axis parallel to the longitudinal axis and intersecting the inlet and outlet pipe axes.

16. The hydrodynamic separator of any one of claims 12 to 15, wherein the second aperture extends along a second axis parallel to the longitudinal axis.

17. The hydrodynamic separator of any one of claims 12 to 16, wherein the dividing wall defines an angle between about 25 and about 35 or an angle of about 30 relative to the inlet and outlet pipe axes.

18. The hydrodynamic separator of any one of claims 1 to 17, wherein a first amount of particles is collected in the bottom chamber during step (i) and a second amount of particles is collected in the first area of the upper chamber during step (ii).

19. The hydrodynamic separator of any one of claims 1 to 18, wherein a first top end of the first peripheral wall of the vortex is at a first vortex distance from a bottom of the top wall, wherein a second top end of the second peripheral wall of the vortex is at a second vortex distance from the bottom of the top wall, the second vortex distance being greater than the first vortex distance such that the second top end of the second peripheral wall of the vortex is lower than the first top end of the first peripheral wall, wherein the top end of the dividing wall is at a dividing wall distance from the bottom of the top wall that generally corresponds to the first vortex distance, and wherein, above a predetermined surface loading rate (i) a first stream of the stormwater flows through the vortex, for removing particles from the stormwater first stream by swirling motion and gravitation and for collecting the particles in the bottom chamber, and then flows into the bottom chamber and a second stream of the stormwater flows over the second top end of the second peripheral wall of the vortex in the first area of the upper chamber wherein oils and grease are retained; (ii) stormwater first steam partially devoid of particles flows from the bottom chamber through the tube, and then flows in the first area of the upper chamber wherein oils and grease are retained; and (iii) stormwater first steam partially devoid of particles, oils and grease and stormwater second steam partially devoid of particles, oils and grease flow under the bottom end of the dividing wall, and then through the outlet separator opening and in the outlet pipe.

20. The hydrodynamic separator of claim 19, wherein the predetermined surface loading rate is between about 35 L/s/m2 and about 45 L/s/m2.

21. A hydrodynamic separator extending generally along a longitudinal axis, the hydrodynamic separator comprising:
a top wall, a bottom wall and a peripheral wall extending along the longitudinal axis between the top and bottom walls for defining top and bottom chambers, the top and bottom chambers being separated by a separating wall extending transversally relative to the longitudinal axis, the separating wall comprising a top surface and first and second apertures; the peripheral wall defining an inlet separator opening at a first side of the hydrodynamic separator and an outlet separator opening at a second side of the hydrodynamic separator;

an inlet pipe at the first side of the hydrodynamic separator, the inlet pipe being in fluid communication with the inlet separator opening for allowing flow of stormwater in the hydrodynamic separator;
an outlet pipe at the second side of the hydrodynamic separator, the outlet pipe being in fluid communication with the outlet separator opening for allowing flow of stormwater outside the hydrodynamic separator;
a vortex in the top chamber, the vortex comprising a first peripheral wall extending along the longitudinal axis from a first bottom end to a first top end, a second peripheral wall extending along the longitudinal axis from a second bottom end to a second top end, a top peripheral end portion defining an inlet vortex opening in fluid communication with the inlet separator opening and a bottom peripheral wall defining an outlet vortex opening in fluid communication with the first aperture for allowing flow of stormwater from the inlet separator opening to the bottom chamber, wherein the first top end of the first peripheral wall of the vortex is at a first vortex distance from a bottom of the top wall, and wherein the second top end of the second peripheral wall of the vortex is at a second vortex distance from the bottom of the top wall, the second vortex distance being greater than the first vortex distance such that the second top end of the second peripheral wall of the vortex is lower than the first top end of the first peripheral wall;
a dividing wall in the top chamber between the vortex and the peripheral wall of the hydrodynamic separator, the dividing wall extending along the longitudinal axis from a bottom end to a top end, the bottom end of the dividing wall being spaced from the top surface of the separating wall, wherein the first peripheral wall of the vortex and the dividing wall divide the top chamber in a first area adapted to retain oils and grease and a second area in fluid communication with the outlet separator opening, and wherein the top end of the dividing wall is at a dividing wall distance from the bottom of the top wall that generally corresponds to the first vortex distance; and a tube in the first area of the top chamber between the second peripheral wall of the vortex and the dividing wall and extending generally along the longitudinal axis from a bottom peripheral wall to a top peripheral wall, the bottom peripheral wall of the tube defining an inlet tube opening in fluid communication with the second aperture and the top peripheral wall of the tube defining an outlet tube opening in fluid communication with the first area of the top chamber for allowing flow of stormwater from the bottom chamber to the first area of the top chamber, wherein the top peripheral wall of the tube is located above the bottom end of the dividing wall;
wherein, stormwater flows in the inlet pipe and through the inlet separator opening, and wherein, above a predetermined surface loading rate (i) a first stream of the stormwater flows through the vortex, for removing particles from the stormwater first stream by swirling motion and gravitation and for collecting the particles in the bottom chamber, and then flows into the bottom chamber and a second stream of the stormwater flows over the second top end of the second peripheral wall of the vortex in the first area of the upper chamber wherein oils and grease are retained; (ii) stormwater first steam partially devoid of particles flows from the bottom chamber through the tube, and then flows in the first area of the upper chamber wherein oils and grease are retained; and (iii) stormwater first steam partially devoid of particles, oils and grease and stormwater second steam partially devoid of particles, oils and grease flow under the bottom end of the dividing wall, and then through the outlet separator opening and in the outlet pipe.

22. The hydrodynamic separator of claim 21, wherein the vortex has a frustoconical portion with the top peripheral end portion having a first diameter and the bottom peripheral end having a second diameter, the first diameter being greater than the second diameter.

23. The hydrodynamic separator of claim 22, wherein ratios of the first diameter relative to the second diameters are about 380:200, 510:270, 635:340, 760:405, 890:475, 1015:540, 1125:600, or 1250:665.

24. The hydrodynamic separator of claim 23, wherein the vortex has a vortex height between the top and bottom peripheral ends and wherein ratios of the respective first diameter, second diameter, and vortex height are about 380:200:500, 510:270:665, 635:340:835, 760:405:1000, 890:475:1170, 1015:540:1335, 1125:600:1475, or 1250:665:1640.
Date Recue/Date Received 2022-05-31

25. The hydrodynamic separator of any one of claims 22 to 24, wherein the frustoconical portion of the vortex defines an angle between about 75 and about 85 or between about 79 and about 81 .

26. The hydrodynamic separator of any one of claims 22 to 25, comprising a deflecting wall between the inlet opening of the hydrodynamic separator and the inlet vortex opening.

27. The hydrodynamic separator of claim 26, wherein the deflecting wall defines an angle between about 15 and about 45 relative to an axis parallel to the longitudinal axis.

28. The hydrodynamic separator of claim 26 or 27, wherein the inlet pipe has an inlet pipe diameter, wherein the deflecting wall has a width and a length, and wherein the length of the deflector is between about 80% and about 100% of the inlet pipe diameter.

29. The hydrodynamic separator of claim 28, wherein the width of the deflector is between about 80% and about 100% of the inlet pipe diameter.

30. The hydrodynamic separator of any one of claims 21 to 29, wherein the predetermined surface loading rate is between about 35 L/s/m2 and about 45 L/s/m2.

31. The hydrodynamic separator of any one of claims 21 to 30, wherein the inlet and outlet pipes extend along transversal inlet and outlet pipe axes extending transversally relative to the longitudinal axis and intersecting the longitudinal axis such that the inlet separator opening is opposite to the outlet separator opening.

32. The hydrodynamic separator of claim 31, wherein the transversal inlet pipe axis is at an inlet pipe distance relative to the top wall of the hydrodynamic separator and wherein the transversal outlet pipe axis is at an outlet pipe distance relative to the top wall of the hydrodynamic separator, the outlet pipe distance being greater than the inlet pipe distance.

Date Recue/Date Received 2022-05-31

33. The hydrodynamic separator of claim 32, wherein a difference between the outlet pipe distance and the inlet pipe distance is about between 70 mm and 80 mm or about 75 mm.

34. The hydrodynamic separator of any one of claims 31 to 33, wherein the vortex and the first aperture extend along a first axis parallel to the longitudinal axis and intersecting the inlet and outlet pipe axes.

35. The hydrodynamic separator of any one of claims 31 to 34, wherein the second aperture extends along a second axis parallel to the longitudinal axis.

36. The hydrodynamic separator of any one of claims 31 to 35, wherein the dividing wall defines an angle between about 25 and about 35 or an angle of about 30 relative to the inlet and outlet pipe axes.

37. The hydrodynamic separator of any one of claims 31 to 36, wherein a first amount of particles is collected in the bottom chamber during step (i) and a second amount of particles is collected in the first area of the upper chamber during step (ii).

Date Recue/Date Received 2022-05-31