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Catalytic filtration

One of the main WatMan ground water treatment deliveries is the iron removal filters delivered to a province in Finland (in Pieksamaki); the capacity of the filters is 1600 litres per minute. Demanding test runs preceded the selection of the equipment, and an excellent efficiency of purification is achieved even with high-speed filtering. As a result of the fast catalytic reaction, the oxidation of the iron in the filtering media is complete, even though the filtering velocity exceeds 25 m/h. It is important to note that the backwash water velocity is lower than the filtering velocity; this means remarkable savings compared to conventional filters.

The fully automated, logic controlled and chemical free filters have operated flawlessly for 5 years and have produced water that clearly surpasses the norm. Iron concentration in the outlet is lower than 0.05 mg/l. Once again, the parent company Pumplohja supplied the steel pressure tanks and piping equipment for the site.

Water filters working on the same principle have been delivered to the city of Tammisaari and the communities of Tuulos, Oulunsalo and Karjalohja, among others. On the industrial side the same principle is employed in Metsä-Serla, Primalco, and the Federal Bank of Russia in Moscow, among others.

 
 
 
 
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