Well Water : Manganese Removal
Well Water : Manganese Removal
(OP)
Dear All,
I have read some of the post on here with interest, but am still a little confused. Trying to design an Fe Mn removal plant. Design Criteria
inlet outlet
Fe 3.5mg/l 0.1 mg/l
Mn 0.15 mg/l 0.02 mg/l
Removing of iron is simple, but confused on removal of Mn. was thinking of having pH correction (>7.5) and oxidation step (Cl2) followed by contact tank provideing 30 mins detention time to alloww complete oxidation of iron. Then passing this through a pressure filter. My fear is that at these conditions the Mn wont be oxidised (requires much higher pH and contact time). Do i need to use MnO2 or greensand filter to ensure Mn oxidation. If so do i need to increase pH furhter?
What would be the optimum treatment? This is for a remote site in Lybia, so the use of biological filters, or membrane technology may not be appropriate, hence a basic, easy to work system would be ideal.
Many thanks team!!
I have read some of the post on here with interest, but am still a little confused. Trying to design an Fe Mn removal plant. Design Criteria
inlet outlet
Fe 3.5mg/l 0.1 mg/l
Mn 0.15 mg/l 0.02 mg/l
Removing of iron is simple, but confused on removal of Mn. was thinking of having pH correction (>7.5) and oxidation step (Cl2) followed by contact tank provideing 30 mins detention time to alloww complete oxidation of iron. Then passing this through a pressure filter. My fear is that at these conditions the Mn wont be oxidised (requires much higher pH and contact time). Do i need to use MnO2 or greensand filter to ensure Mn oxidation. If so do i need to increase pH furhter?
What would be the optimum treatment? This is for a remote site in Lybia, so the use of biological filters, or membrane technology may not be appropriate, hence a basic, easy to work system would be ideal.
Many thanks team!!





RE: Well Water : Manganese Removal
if this is potable water, high ph is not acceptable. chlorination + filtration (greensand) will work ok, but you need 3-4 times stechiometric chlorine dose for manganese.
0.02 mg/l mangane is quite low, we had this tested with Mn less than 0.04 mg/l consistently...
RE: Well Water : Manganese Removal
Cheers
RE: Well Water : Manganese Removal
Would recommend that you use a manganese greensand process. Note that if the free carbon dioxide of the raw water is high, it is advisable to remove it to prevent the manganese pickup from an exhausted bed.