Chemical Feed

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 venturi, 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.