Model: FAD 180
Brochure FAD
FAD deferrization, demanganization filters allow for removal of iron and manganese from water, present in a non oxidized form.
FAD
filters are normally used as regards to a preliminary oxidation
treatment with air or, more frequently, with sodium hypochlorite or
other oxidizing agents (for example, potassium permanganate).
In the presence of iron, the phase of initial oxidation allows the oxidation from Fe2+ to Fe3+ that precipitates as hydroxide. . The removal of manganese is through a catalytic process following an in-line chlorination. Oxidation of soluble manganese is through free chlorine by the catalytic action performed by the mineral granules in the filter bed. At the bottom of FAD filter, the active carbon filter (ACF) is normally used to remove the exceeding residual chlorine.
The choice of the filtering bed, composed by a mixture of catalytic acting minerals and of inert of a suitable size, has been adopted 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) enable the expulsion of the retained impurities and clearing of the filtering bed. WTEC manufactures standardized filters from 1 to 50 m3/h, with specific materials according to demands of use and application.
The filtration batteries (several parallel filters) can treat total capacities exceeding 5000 m3/h
