Abstract
Abstract Magnesium oxide has been shown to be particularly valuable in the removal of soluble silica from water. This paper deals with an adsorption process for silica removal which has been recently developed. This process is particularly well adapted for use in conjunction with hot-process lime-soda softening, causing no increase in the quantities of either lime or soda ash. Removal of silica from solution is effected, not by a chemical reaction but by adsorption from solution. Adsorption data correspond to Langmuir and Freundlich adsorption isotherms. An outstanding advantage of this process is the fact that the solids content of the treated water is decreased, rather than increased. No increase in the total solids content of the treated water results as would be the case with the use of reagents such as ferric sulphate and magnesium sulphate. In common with other adsorption processes, the last traces of silica are the most difficult to remove. To illustrate what can be accomplished in this respect data are presented from an actual full-scale plant test in which a silica content of 6.3 ppm in the raw water was reduced to an average of 0.6 ppm in the treated water. Experience has also been gained in the treatment of a natural water in which the silica content was reduced from 56 ppm to 1 ppm in the treated water.
Published Version
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