Chemical feed systems for water accurately administer pre-determined
doses of a gas, solid or liquid chemical to a water stream or
reservoir. Common examples are chlorination, ozonation, pH adjustment
or iron and manganese treatment.
As well as just feeding the chemical, one often has to adjust
to the flow rate with a flow-paced feed system utilizing a flow
meter and controller. An example of such a system is shown in
the illustration below. These systems avoid common over- and under-feed
symptoms where there is a variable flow rate.
In other examples we wish to monitor the level of chemical remaining
in the water, or the residual concentration. This can be accomplished
automatically with an on-line monitor-controller. Filterco handles
a complete selection of on-line instrumentation for this control,
as well as remote monitoring and data logging. Programmable Logic
Controllers, PLC’s) are also available for more demanding
applications.
When chemical is administered into a water stream, it is often
necessary to enhance mixing for a faster, more uniform reaction.
This is usually handled by a static mixer, which requires no power.
The static mixer is merely a series of baffles inside a pipe.
When even more reaction time is required, a contact chamber or
clarifier must be used.
When administering a gas into a water stream, the choices are
either drawing the gas with a vacuum or forcing it in by pressure.
For vacuum an eductor, or venturri, is utilized. For pressure
some kind of compressor or pump must be used. The advantage of
a vacuum system is simplicity in design, and reduced risk of over
feeding. Smaller ozone and air feed systems usually use these
methods.
Filterco handles a full line of chemical metering pumps, flow
metering systems, eductors and associated controls. Contact us
for further information on the best means of meeting your chemical
feed requirements.
