Dissolved manganese is usually present in water containing iron. The oxidation of manganese with oxygen from the air is then more difficult, due to the fact, that manganese is oxidised after iron. In classical treatment through aeration two filter stages are therefore often connected in series. Iron removal is carried out in the first stage, demanganisation in the second stage. Biological demanganisation can require inlet times of up to 4 months.
If ozone is used, manganese can be removed in one filter stage together with iron and any arsenic that may be present. The advantage of ozone oxidation is the complete demanganisation without inlet times.
In addition to chemical and biological demanganisation, catalytic filter materials are primarily used. Demanganisation can occur in one or two filter stages, depending on the manganese content of the raw water.
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