Pyrolusite filter - Manual

Manual filters with pyrolusite (manganese dioxide) and quartz sand to be used in the removal of iron and manganese. They find specific use in various primary or technological water treatment processes for different uses.

To remove the iron, oxidation can be carried out first by transforming Fe 2+ into Fe (OH) 3 thus allowing its mechanical elimination in the filter bed, in the absence of the preliminary oxidative phase the pyrolusite itself promotes the oxidation of the ferrous ion. The optimal speed for iron removal is 15 to 10 meters / hour at neutral pH.

As regards the removal of manganese, a contact time of between 6 and 10 minutes is recommended and it is possible to intervene through two types of processes: (a) oxidative, (b) catalytic.

a) The oxidative process takes place in the absence of pre-chlorination but it is necessary to regenerate the pyrolusite using chlorinated water during the counter-current washing in a 2: 1 ratio (ppm chlorine: ppm manganese);

b) The catalytic process takes place with a pre-chlorination of the water to be treated always in the ratio 2: 1 (ppm chlorine: ppm manganese).

They consist of a reinforced fiberglass cylinder with an internal PET shell in a single piece without joints in compliance with the D.M. 174/2004; filter material compliant with UNI EN 13752: 2009; valve for manual control of the filtration and washing phases.

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