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Spring Water Filtration
Fluid : Well water
Temperature : ambient
Pressure : 3 – 4 barg
Retention rating : 25 - 30 micron nominal
Flowrate : 8000gph (133 gpm) = 936 M3/hr (10.10 lps)
Line size : 4"
A leading bottler of spring water and manufacturer of soft drinks had been using Ronningen-Petter bag filters as the first stage filters in their plant for many years. They use them for both filtering the water and filtering sugar syrup.
Problem:
They wanted to automate their facility to a greater degree and do away with the
necessity for manually cleaning and inspecting the first stage filters which filter the
water as it leaves the well supply.
Solution:
We supplied a Ronningen-Petter automatic backwashing filter which utilises the same
polypropylene filter media as the bag filters. It consists of several filter vessels
mounted in parallel on common inlet, outlet, drain & backwash supply headers.
Each vessel contains a polypropylene filter sleeve supported by a perforated stainless steel core. A differential pressure switch monitors the rise in pressure drop across the filter as it stops debris and gradually blocks. At a preset point, typically 10 – 15 psi pressure drop, the system backwashes for 10 - 12 seconds by reversing flow through it and then to drain. The other vessels remain on stream to provide an uninterrupted supply to process. Backwashing only occurs as is needed as dictated by the solids loading.
Result:
They purchased a 5 station filter with an additional blank station which can be filled
at a later date to provide increased capacity. It is an external backwashing unit i.e. it
uses a pumped supply of clean water for the purpose of backwash. Upon installation
they remarked that they were able to see the bottom of their storage tanks for the first
time in many years.
