Over the years we have installed numerous Heuch Series Media Filters in a variety of industries.
Heuch water filters are a permanent media type units specifically designed to clean industrial and process water. Our water filters have an automatic filtering and back washing operation. They are specifically designed for removing small particles from process water in by-pass and side stream low pressure system arrangements.
These filters are designed to remove particles of size down to 5 micron depending on the media used and the filtration and back washing rates applied. Further customisations can be installed to remove particles that are even smaller than 5 microns.
So how does the filtration process work?
Water that is circulating in the cooling tower system is drawing from the system by the filter pump and is passed into the water distributors at the top of the filter vessel. This spreads the water over the filter media. Dirt is separated from the water in the media and then passes through the under drain laterals at the bottom of the filter and then re-enters the circulating system from the outlet pump.
Dirt from the water builds up in the filter media and increase the pressure needed to pass the water through the filter media. When there is sufficient differential pressure across the tank, an electric actuator automatically positions the filter valves so the water flow is reversed through the media and the dirt is back washed out through the waste outlet pipe.
Standard Heuch filters have a time clock to ensure back washing occurs at least once every twenty four hours whether or not the differential pressure actuating level has been reached. This reduces the potential for bacterial growth in the filter.
In addition, a fault timer is provided so that if the actuator does not return to forward filtering flow within sixty seconds, then the filter pump is shut down and the filtering process ceases. A fault light will signal and a service technician should be advised to attend and correct the condition.
While the water is passing through the filter in reverse direction (back washing), there is vigorous scrubbing of the media and dirt is released to be discharged to waste. At the end of the set back washing period, the valves are turned to their filtering position and forward flow filtering resumes.
The waste water and dirt may need to be discharged into the sewerage system or elsewhere depending upon statutory regulations applying at the site. Local authorities should be consulted.
In typical situations, the backwash water is taken from the system. To save water treatment chemicals that are in the system being lost during backwash, an automated changeover to a separate water supply such as from municipal service, either directly or via a water storage vessel can be incorporated into the system pipework for the back washing period. A throttling valve should also be placed on the outlet backwash line to minimise the loss of filter media during the backwash process.
If you are looking for a solution for your water media filter, contact us today for an obligation free assessment.
