Reagent iron removal filters
Reagent iron removal filters are designed to remove from the water:
- iron – up to 15 mg/l;
- manganese – up to 12 mg/l;
- hydrogen sulfide – up to 5 mg/l;
- durbidity and chromaticity.
The unit consists of a filter housing, made of fiberglass, but inside it is laminated polyethylene, automatic control valve, filtering environment, supporting layer of gravel, drainage and distribution system, the tank for the preparation of the regeneration solution.
Filtering materials - Manganese Greensand, Greensand Plus, MTM.
Manganese Greensand - Manganese Greensand is formulated from a glauconite greensand which is capable of reducing iron, manganese and hydrogen sulfide from water through oxidation and filtration. Soluble iron and manganese are oxidized and precipitated by contact with higher oxides of manganese on the greensand granules. The hydrogen sulfide is reduced by oxidation to an insoluble sulfur precipitate. Precipitates are then filtered and removed by backwashing. When the oxidizing capacity power of the Manganese Greensand bed is exhausted, the bed has to be regenerated with a weak potassium permanganate (KMnO4) solution thus restoring the oxdizing capacity of the bed. 1½ to 2 ounces of potassium permanganate, in solution, per cubic foot of Manganese Greensand is considered sufficient for normal regneration. It is required to vigorously backwash and regenerate the bed when it is placed in service and before its oxidation capacity is totally exhausted. Operating the bed after oxidation capacity is exhausted will reduce its service life and may cause staining.
МТМ - granular filter media, enriched with manganese oxide. It removes water from iron, manganese and hydrogen sulphide. The active surface of the granules precipitate dissolved iron and manganese. The precipitate is delayed by the layer of filtering material and removed by backwashing. When MTM oxidation potential decreases, it is necessary to conduct regeneration with solution of potassium permanganate. Before regeneration MTM undergoes backwash stream which do not flush light granules into drainage.