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APS TechNotes See all articles

Manganese Greensand Media

Manganese Greensand is formulated from a glauconite greensand which is capable of removing iron, manganese, and hydrogen sulfide from water through oxidation and precipitated by contact with higher oxides of manganese on the greensand granules.

When the oxidizing capacity power of the Manganese Greensand bed is exhausted, the bed has to be regenerated with a weak potassium permanganate, in solution, 2 to 4 ounces of permaganate per/ cu. Ft. of Manganese Greensand is considered sufficient for normal regeneration.

It is advisable to vigorously backwash and regenerate the bed when it is placed in service and before the oxidation capacity it totally is exhausted. To operate the bed after its oxidation capacity is exhausted may reduce its service life.

  

OPERATING PARAMETERS

Max Iron = 15 p.p.m.
Max Hydrogen Sulfide = 5 p.p.m

  • Capacity/Cu. Ft.


  • Iron Alone--550 gr. '10.000 gal. Of water conditioning 1 ppm iron/cu. Ft.'

    Iron and Manganese--400 gr. '7,000 gal of water containing 1/2 ppm iron and 1/2 ppm manganese/ cu. Ft.'

    Hydrogen Sulfide - 175 gr. '3,000 gal. Of water containing 1 ppm hydrogen sulfide, cu. Ft'

    Iron Alone--550 gr. '10.000 gal. Of water conditioning 1 ppm iron/cu. Ft.'

    Iron and Manganese--400 gr. '7,000 gal of water containing 1/2 ppm iron and 1/2 ppm manganese/ cu. Ft.'

    Hydrogen Sulfide - 175 gr. '3,000 gal. Of water containing 1 ppm hydrogen sulfide, cu. Ft'

  • Advantages


  • Iron removal over wide pH range

    Effective removal of hydrogen sulfide in addition to iron and/or manganese

    No harmful effects from chlorine feed

    Low attention loss for long bed life

  • Physical Properties


  • Color - Black

    Density -85 lbs./cu. Ft.

    Effective Size -0.30 - 0.35 mm

    Uniformity Coefficient - 1.6

    Mesh Size - 16 - 60

    Attrition Loss Per year - 2%

  • Conditions For Operation


  • Raw Water pH -  6.2  - 8.8

    Bed Depth - 30 in.

    Freeboard - 35 - 50%

    Service Flow Rate - 8-12 gpm. Sq. ft., 8-10 gpm/sq. ft. intermittent flow possible

    Backwash Flow Rate - 8-12 gpm. Sq. ft.

    Maximum Temperature Raw Water - 80of, - 26.7 oC

    Maximum Practical Limit of Iron 'Fe __' or Manganese 'Mn __' In Raw Water -  15 ppm.

    Maximum Practical Limit of Hydrogen Sulfide 'H2S' - 5 ppm.


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