The Telegraph-courier. [volume] (Kenosha, Wis.) 1888-1946, 1917-10-04

sins, the remainder being removed by
the filters. From the flume the water
passes into the filters down through
the sand beds and under drains through
rate controller into the clear water
basin. The clear water basin is so
constructed that The water is continu-
ally in motion from the time it leaves
the filter until it is pumped by the
high duty pumps into the City mains.
"The coagllent apparatus consist of
two solution tanks in which the slup.
Alumina is dissolved A sufficient
amount of sulp. Alumnia is weighed to
bake up certain per cent. solution
This is placed in the dissolving trays at
the top of the solution tanks and water
is sprayed over the slup. alumina and
dissolved into the tanks which are in
duplicate so that one may be used
while the other is being prepared. The
slup. alumina solution is kept at an
equal strength by the use of agitators.
The solution flows by gravity to the orr
flee feed boxes, through a lead pipe
and is conducted from there through a
pipe to the influent or mixing chamber
where it is mixed with the raw water.
The supply of solution to the raw water
Is controlled by proportional feed
apparatus operated by ventura tube
and mechanism connected to hard rub
Der needle and calibrated orifice through
which the solutio,- flows In proportion
to the amount of water pumped.
When water requires determination or
to be steriized, chlorine las is used,
This apparatus is connected up with
verturi meters in clear water basins and
gas is used in proportion to the amount
of water filtered.
The method of washing sand beds
in filters is as follows: The filter in
fluent or inlet valve is closed and the
water in the filter is run through the
effluent or outlet until the level of the
water is five inches below the tops
of cutters. The effluent valve is then
closed and the sewer valve opened. The
beds are then agitated with air supplied
by blower delivering HOO cubic feet
Of free air under 31a pounds pressure.
The air is forced through the strainer
system and up through the sand for a
space of about one minute. This breaks
up the coating of sediment on top of
valve is opened. The wash water is
pumped from the clear water basin by a
centrifugal pump delivering approx
mate 5000 gallons per minute. The
wash water flows up through the sand
and into longitudinal troughs carrying
the water and sediment to the sewer.
The approximate time it takes to per-
form this operation Is five minutes.
The wash water pump is then stopped
and the valve closed, the sewer valve
closed and the influent valve is then
opened slowly and the filter filled up
with water to basin level. Then the
filter waste valve is opened and the
water allowed to filter into the sewer
for about minute. The valve is then
closed and the effluent valve opened,
the filter is then in. service.
Indicator gauges are used on each fill
ter unit to show the rate of flow in
gallons per "a hours, also gauges show
ing loss of head in filters due to the
accumulation of matter on top of sand
beds. The operating force consists of
Mr.. p. Tanning, Supt., ald three opera
tors. The plant is open for public
inspection and visitors are always vel
Gomez