Insoluble Silica

Wastes with fine sand, silica gels, activated silica sols, and colloidal silica, as well as silica-containing substances such as silt, clay, fly ash, diatomaceous earth, diatoms, and minerals can be removed by clarification or by inline pressure coagulation-filtration. Without chemical flocculation, filtration can only remove 50-80% of silica, or perhaps none if particle size is sub-p. Macroreticular colloidal removal ion exchange resin has been effective in removing virtually 100% of colloidal silica (Kunin and Hetherington 1969).

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