Description
Manganese Greensand is capable of reducing iron, manganese and hydrogen sulfide from water through oxidation and filtration.
Manganese Greensand is processed from a glauconite greensand which is capable of reducing 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 reduced by oxidation to an insoluble sulfur 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 oxidizing capacity of the bed. 1 1⁄2 to 2 ounces of potassium permanganate, in solution, per cubic foot of Manganese Greensand is considered sufficient for normal regeneration. It is required to vigorously backwash and regenerate the bed when it is placed in service and before its oxidation capacity is totally exhausted. Operating the bed after oxidation capacity is exhausted will reduce its service life and may cause staining.
Advantages
• Iron reduction over wide
• Effective reduction of sulfide in addition to iron manganese • No harmful effects from a feed
• Low attrition for long bed life
Physical Properties
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Colour : Black |
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Bulk Density : 1360 kg/m3 |
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Specific Gravity: 2.4 – 2.9 |
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Effective Size : 0.30-0.35 mm |
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Uniformity Coefficient : 1.6 |
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Mesh Size : 16-60 |
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Attrition Loss Per Year : 2% |
The data represents typical values and not production parameters
Condition for Operation
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Water pH range : 6.2 – 8.5 |
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Max. water temperature : 26.7 °C |
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Bed depth : 30 in |
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Freeboard Size: 50% of bed depth(min) |
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Regeneration: 1.5 – 2.0 gm of KMnO4 by weight per ltr |
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Service flow rate: 3-5 gpm/sq.ft., 8-10 gpm/sq.ft. intermittent flow possible |
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Backwash flow rate: 10-12 gpm/sq.ft. |
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Backwash bed expansion : 40% of bed depth(min) |
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Maximim practical limit of iron (Fe++) or magnese (Mn++) in raw water : 15 ppm |
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Maximum practical limit of hydrogen sulfide (H2S): 5 ppm |
Capacity per m3 of Manganese Greensand
Iron alone – 1370 gm (1370m3 of water containing 1 ppm iron)
Iron and manganese – 915 gm (935 m3 of water containing 1⁄2 ppm iron and 1⁄2 ppm manganese)
Hydrogen Sulfide – 400gm (400m . of water containing 1 ppm hydrogen sulfide)
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