...
Floc
...
Hopper
...
Design
...
Program
...
The
...
primary
...
purpose
...
of
...
the
...
floc
...
hopper
...
is
...
to
...
regulate
...
the
...
height
...
of
...
the
...
floc
...
blanket
...
found
...
in
...
the
...
sedimentation
...
tanks.
...
Floc
...
Hopper
...
Design
...
Program
...
Inputs
...
and Outputs
Floc Hopper Design Program Algorithm
The design of the floc hopper depended upon various input parameters concerning the sedimentation tank and lamella, which included the length of the lamella and the width of the sedimentation tank. The floc hopper has a trapezoidal cross-sectional area, and was designed to lie on the sedimentation sludge drain and line up with the sedimentation pipe frame ledge. The floc hopper was designed to rotate from the sedimentation wall chimney so that the floc hopper would line up vertically with the first lamella also extending from the chimney wall. If the angle of the floc hopper (with respect to the sedimentation sludge drain) was greater than 60 degrees, this orientation would allow for maximum efficiency from the floc hopper. (slightly unclear what you mean by maximum efficieny? Do you mean that maximum efficiency is most effective at keeping floc blanket level constant?)
First, the various parameters from the above picture were calculated.
The width of the floc hopper had to line up evenly with the width of the sedimentation sludge drain (this side of the floc hopper lies on the sludge drain):
| Wiki Markup |
|---|
Outputs [Floc Hopper Program Inputs|https://confluence.cornell.edu/display/AGUACLARA/Floc+Hopper+Design+Program+Inputs] [Floc Hopper Program Outputs|https://confluence.cornell.edu/display/AGUACLARA/Floc+Hopper+Design+Program+Outputs] h2. Floc Hopper Design Program Algorithm \\ !Floc Hopper in Plant.JPG|width=849,height=396! !Floc Hopper Front.JPG|width=644,height=353! \\ \\ !Floc Hopper Side.JPG|width=642,height=325!\\ \\ \\ The design of the floc hopper depended upon various input parameters concerning the sedimentation tank and lamella, which included the length of the lamella and the width of the sedimentation tank. The floc hopper has a trapezoidal cross-sectional area, and was designed to lie on the sedimentation sludge drain and line up with the sedimentation pipe frame ledge. The floc hopper was designed to rotate from the sedimentation wall chimney so that the floc hopper would line up vertically with the first lamella also extending from the chimney wall. If the angle of the floc hopper (with respect to the sedimentation sludge drain) was greater than 60 degrees, this orientation would allow for maximum efficiency from the floc hopper. +(slightly unclear what you mean by maximum efficieny? Do you mean that maximum efficiency is most effective at keeping floc blanket level constant?)+ \\ First, the various parameters from the above picture were calculated. \\ The width of the floc hopper had to line up evenly with the width of the sedimentation sludge drain (this side of the floc hopper lies on the sludge drain): \\ \\ {latex} \large $$ W_{FlocHopper} = W_{SedSludgeFlat} $$ {latex} |
The
...
length
...
of
...
the
...
floc
...
hopper
...
is
...
required
...
to
...
cover
...
the
...
entire
...
width
...
of
...
the
...
sedimentation
...
tank,
...
so
...
the
...
two
...
must
...
be
...
equal:
| Wiki Markup |
|---|
\\ \\ {latex} \large $$ L_{FlocHopper} = W_{SedBayActual} $$ {latex} |
The
...
first
...
lamella
...
and
...
the
...
floc
...
hopper
...
must
...
be
...
lined
...
up
...
vertically
...
-
...
in
...
order
...
for
...
this
...
to
...
happen,
...
the
...
horizontal
...
distance
...
from
...
the
...
bottom
...
of
...
the
...
first
...
lamella
...
to
...
the
...
chimney
...
wall
...
must
...
be
...
equal
...
to
...
the
...
horizontal
...
distance
...
from
...
the
...
top
...
of
...
the
...
floc
...
hopper
...
to
...
the
...
chimney
...
wall.
...
The
...
horizontal
...
length
...
from
...
the
...
bottom
...
of
...
the
...
first
...
lamella
...
to
...
the
...
chimney
...
wall:
| Wiki Markup |
|---|
\\ \\ {latex} \large $$ L_{FlocHopperOffset} = L_{SedPlate} \cdot \cos \left( {AN_{SedPlate}} \right) $$ {latex} \\ |
The
...
vertical
...
component
...
of
...
the
...
floc
...
hopper's
...
height
...
depended
...
on
...
the
...
elevation
...
of
...
the
...
sedimentation
...
inlet
...
slopes,
...
as
...
well
...
as
...
the
...
height
...
of
...
the
...
sedimentation
...
sludge
...
drain.
...
The
...
vertical
...
height:
| Wiki Markup |
|---|
\\ \\ {latex} \large $$ Z_{FlocHopper}= Z_{SedSlopes} - H_{SedSludge} $$ {latex} The actual height of the floc hopper was calculated |
The actual height of the floc hopper was calculated using the Pythagoreas Theorem, with L.FlocHopperOffset and Z.FlocHopper serving as the two sides of a right triangle, and the height of the floc hopper as the hypotenuse:
| Wiki Markup |
|---|
using the Pythagoreas Theorem, with L.FlocHopperOffset and Z.FlocHopper serving as the two sides of a right triangle, and the height of the floc hopper as the hypotenuse: \\ \\ {latex} \large $$ H_{FlocHopper} = ({L_{FlocHopperOffset}^2 + Z_{FlocHopper}^2})^{{1 \over 2}} $$ {latex} |
The
...
thickness
...
of
...
the
...
floc
...
hopper
...
was
...
assumed
...
to
...
be
...
equal
...
to
...
the
...
thickness
...
of
...
the
...
sedimentation
...
slope
...
plate:
| Wiki Markup |
|---|
\\ \\ {latex} \large $$ T_{FlocHopper}= T_{SedSlopePlate} $$ {latex} \\ |
The
...
angle
...
that
...
the
...
floc
...
hopper
...
must
...
be
...
rotated
...
was
...
then
...
calculated.
...
With
...
respect
...
to
...
the
...
sedimentation
...
sludge
...
drain,
...
the
...
angle
...
the
...
floc
...
hopper
...
must
...
be
...
rotated:
| Wiki Markup |
|---|
\\
\\
{latex}
\large
$$
AN_{FlocHopper} = atan\left( {{{Z_{FlocHopper}} \over {L_{FlocHopperOffset}}}} \right)
$$
{latex} |