Dear Madalin Negu Manganese ...

Dear Madalin Negu

Manganese Treatment  in Drinking water
 

Ion Exchange  
Ion exchange can remove small amounts of soluble manganese from water. Potassium chloride may be used to regenerate the resin beads instead of sodium chloride if the added sodium is of concern.

Oxidizing Filters  

Oxidizing filters can remove up to 15-25 mg/L of combined concentrations of Manganese. Greensand, anthracite sand, natural or synthetic zeolites are used in a mixed media or a pressure filter. Potassium permanganate (KMnO4) is used to coat greensand and anthrasand with manganese oxide, giving it a catalytic effect. This coating oxidizes and removes Manganese usually without requiring an additional oxidation/precipitation step. The coating can be maintained either by a continuous potassium permanganate feed or by backwashing at set intervals with a potassium permanganate solution. 

Natural and synthetic zeolite filter media have a catalytic effect that does not require chemical backwashing to remove the precipitate. The filter media may use venturi air injection as an oxidant, with an air relief valve that bleeds off excess air.

Oxidizing filters can be used with ferrous or ferric iron, and manganous or manganic manganese. The minimum pH is 7.0. A pH of 8.0 is needed when the manganese concentration is high.

Filtration  

Filtration is the most common method of removing  manganese after oxidation. Slow sand filters, bag or cartridge filters, pressure filters, or conventional filters can remove the oxidized contaminants. Slow sand filters and conventional filters are the most expensive alternatives and are not normally used for removing Manganese unless colloidal particles, bacteria, or other filterable contaminants are present. Bag or cartridge filters have a very low capital cost, but higher maintenance cost in filter replacement. Automatically backwashing pressure filters have a higher capital cost and a lower maintenance cost. 

regards,

Prem Baboo