WTEC - Model FAD - Deferrization, Demanganization Filters
From Deferrization
FAD deferrization, demanganization filters allow to remove from the water the iron and manganese in a non-oxidised form. FAD filters are usually used before a preliminary oxidation treatment, with air or more frequently, with sodium hypochlorite, or other oxidising agents (e.g. potassium permanganate). The initial oxidation stage allows, in presence of iron, the oxidation from Fe2+ to Fe3+ that precipitates as hydroxide. The removal of manganese is through a catalytic process following an in-line chlorination. The oxidation of the soluble manganese is through free chlorine by the catalytic action of the mineral granules in the filter bed. FAC active carbon filter is used for the removal of the exceeding remaining chlorine, at the bottom of the FAD filter.
Product Details
The selection of the filter bed, composed by a mix of catalytic acting minerals and suitable inert particles, has been studied in order to guarantee the contact time required for an efficient removal of iron and manganese. Periodic filter washing (backwashing with water and final washing) enables the expulsion of the retained impurities and clearing the filter bed.
Applications
- Weel water filtration
- Iron removal
- Manganese removal
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