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Manganese
Greensand is formulated from a glauconite greensand
which is capable of removing 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 eliminated by oxidation
to sulfate and an insoluble 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 oxidation
capacity of the bed.
Two to four ounces
of potassium permanganate, in solution, /cu ft.
of Manganese Greensand is sufficient for normal
degeneration. It is advisable to vigorously backwash
and regenerate the bed when it is placed in service
and before its oxidation capacity is totally exhausted.
To operate the bed after its oxidation capacity
is exhausted may reduce its service life.
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