Note: Descriptions are shown in the official language in which they were submitted.
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
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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.
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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
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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
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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.
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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
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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:
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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;
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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
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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.
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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.
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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
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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
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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
20
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
16
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
2087
(mm)
First (inlet) vortex diameter 381 508 635 762 891 1016
1124 1249
(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
1639
Vortex angle (degree) 80 80 80 80 80 80 80 80
Height differences between 792 1063 1328 1594 1863 2125 2351
2612
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
665
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
17
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
60 1-
40 _________________________________________
g
E
20 ________________________________________________ 4
OC
41/
0 ________________________________________________ ¨
0 5 10 15 20 25 30 35 40
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.
18
Date Recue/Date Received 2022-05-31
