TM 5-4610-218-34
(3) Filter pump. The filter section contains
permit intermittent drainage of the slurry to
a filter pump for pumping the coagulated water
waste. There is an outlet near the top of the
through the filter.
main tank with a manually-operated valve to
control the flow of clear coagulated water to the
f. Chemical Feed Equipment.
wet well. There is also an outlet in the bottom
for draining the tank.
(1) Chemcial slurry feeder. The chemical
slurry feeder (fig. 1-5) consists essentially of an
(7) Slurry weir box. The slurry weir box
aluminum tank divided into two equal water-
tight compartments. The two compartments are
nally to the erdlator tank. It houses the draw-off
covered with one hinged cover. Each compart-
port near the top of the erdlator and permits
ment has four agitators with two measuring
gravity flow of flocculent slurry from the er-
cups attached to diametrically opposite agita-
dlator tank to the sludge concentrate tank.
tors, a clear-plastic window, drain outlets, col-
(8) Agitator shaft and downcomer tube.
lecting funnel, filling connection, and rate-of-dis-
The agitator shaft consists of a tubular shaft
charge controller. The chemical slurry feeder
with five equally-spaced circular disks attached.
agitators operate from a common shaft and ro-
It is mounted in the center of the erdlator tank
tates vertically. Each compartment functions as
on the bearing support. The agitator shaft is
a separate unit, permitting two different chem-
surrounded by the downcomer tube and baffle
ical solutions to be fed at the same time. The
ring to form the mixing zone.
chemical slurry feeder tank supplies pulverized
(9) Agitator speed reducer. The speed re-
limestone slurry (coagulation aid) to the erdlator
ducer (fig. 1-3) is mounted on brackets attached
tank and diatomite slurry to the diatomite dilu-
to the agitator bearing mounting plate. It re-
tion tank.
duces the speed from the agitator drive motor to
(2) Chemical solution feeder. The chemical
the erdlator agitator drive shaft.
solution feeder is constructed of material having
anticorrosive resistance and is mounted to the
(10) Agitator drive motor. The agitator
first shelf of the chemical feed equipment frame.
drive motor is mounted on an adjustable sliding
It consists of two diaphragm pumps operated
base attached to the bridge rail assembly. It is a
from one electric motor by means of a gear re-
three-phase, totally enclosed motor, with oblong
duction mechanism. The chemical solution
mounting holes in the base for adjustment and
feeder pumps ferric chloride and calcium hypo-
alignment.
chlorite solution from two chemical tanks into
(11) Bridge rail assembly. The bridge rail
the mixing zone (fig. 1-4) of the erdlator tank.
assembly consists of two aluminum channels at-
(3) Chemical slurry feeder speed reducer.
tached to the top of the erdlator tank. They are
The chemical slurry feeder speed reducer (fig. 1-
used for supporting components of the erdlator
5) is mounted on the second shalf of the chem-
assembly located over the tank.
ical feed equipment frame. It reduces the speed
e. Filter Section.
from the slurry feeder drive motor to the feed ag-
itator. The ratio is 60 to 1.
(1) Diatomite filter. The filter section con-
tains a diatomite filter (fig. 1-3) specially de-
(4) Chemical slurry feeder drive motor. The
signed to employ the filtration properties of di-
chemical slurry feeder drive motor is mounted
atomaceous earth. The filter is essentially a two-
on the second shelf of the chemical feed equip-
part cylinder containing six filter elements, each
ment frame. It drives the slurry feeder through a
with a total filtering area of 10.02 square feet.
speed reducer and chain drive safety slip clutch.
The filter has two pressure gages for indicating
(5) Diatomite slurry dilution tank assem-
the pressure on the influent and effluent side of
bly. The diatomite slurry dilution tank assembly
the filter, a precoat funnel for adding prepared
is made of aluminum and welded watertight. It
diatomite slurry for precoating the filter ele-
is mounted to the slurry feeder tank and pro-
ments, and an air release valve for releasing air
vides storage of diatomite slurry to supply the
trapped in the filter.
suction line of the filter pumps.
(2) Valves and piping. A flow controller
(6) Chemical solution tanks and covers.
valve is located in the effluent filtered water line
There are two chemical solution tanks, located
of the filter to maintain a fixed constant rate of
under the chemical solution feeder. These tanks
flow through the filter. There are also additional
are made of steel, lined with synthetic rubber
valves and piping necessary for operation of the
molded to the metal. They are used to store a
filter.
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