With this type of solution, we uses the oxidizing power of special catalyst supports (zeolite or manganese dioxide, MnO2), which have the capacity to transform the dissolved iron in the insoluble hydroxide iron and consequently easily removable. This material is mixed with the quartz sand, forming a single filter bed. Generally, it is used a multilayer bed formed by:
- Under-bed support in quartzite.
- Over-layer in charcoal of vegetable origin.
- Central Stadium in manganese dioxide with high quality and selected size of grains.
The action of the filtering beds also involves the manganese removal that is greatly reduced, up to 90 ÷ 95% of the inlet load.
The inlet water must be free of suspended substances, such as silt and clay, thus not to compromise the effectiveness of the oxidizing material.
This technology is used as an integral part of the treatment process in a Primary Water Plant.