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Silica removal from raw water

"Water quality & Treatment"
by American Water Works Association

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Did anybody hear about the possibility of removing Silica from raw river water by the dosing of ferric? raw water conc. is between 20 and 80 mg/l. Would be nice to have some info about that.

Thanks in advance,

Ulrich Mende
- Hilden, Germany

Although silica can be removed by adsorption on an iron floc,the efficiency is low. The preferred method for silica removal would be hot process lime-zeolite softening. You would be able to reduce your silica level to ~1-2 ppm.

Colin Mckay
- Johannesburg, South Africa

Normally Silica tends to get suspended in water at an elevated pH of 10.6 and above at 35 °C.
A burnt Dolomite (20% of MgO and 40% CaO) will fix the Silica completely.
Try it out.

Suresh K John M.E.
- TN, S.India

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