Manganese Dioxide

The removal of iron and manganese from potable water
 
Manganese Dioxide is used for the removal of iron and manganese from potable water.  For continuous catalytic iron removal, aeration prior to filtration is all that is required.  For the catalytic removal of manganese, an oxidising agent such as chlorine is needed to promote the conversion of manganese to its oxide.  In the absence of chlorine or other suitable oxidising agent, the filter bed will remove manganese only for a limited time, dependant on the manganese content of the raw water and the quantity of manganese dioxide in the filter bed.  In this case, the filter bed will require periodic reactivation with a filter backwash or a filter soak containing an oxidant such as sodium hypochlorite solution or permanganate solution.

The usual procedure for use in rapid gravity sand filters is to add up to 20% by volume of manganese dioxide to a bed of 0.5-1.0mm or 0.6-1.18mm filter sand.  The sand  should not exceed 0.8-1.25mm in size.  After backwashing, the manganese dioxide will remain evenly distributed throughout the bed.  The prepared sand and manganese dioxide bed should be backwashed gently three or four times prior to service, discarding the first bed volume of filtered water.

Filtration rates of up to 10 m/h are achievable; backwash velocities should not exceed 25 m/h.  

About

Manganese Dioxide is available in 25Kg sacks.
 

For further information please contact us.

Typical Chemical Analysis

Typical Physical Properties