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00310 TECHNIQUE FOR EVALUATING SILICA SCALING AND ITS INHIBITION IN REVERSE OSMOSIS DESALTING

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Product Number: 51300-00310-SG
ISBN: 00310 2000 CP
Author: Raphael Semiat, Iris Sutzkover & David Hasson
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The presence of silica in brackish water greatly complicates the reverse osmosis desalting process. Threshold limits of silica scale precipitation are difficult to predict as they are influenced by a large number of parameters. Another difficulty is the lack of a silica anti-scalant that can be confidently used to extend water recovery limits. Moreover, silica scales depositing on a membrane are difficult and costly to remove. The present paper describes the development of laboratory techniques for the determination of the permissible water recovery limits in desalting brackish waters containing silica and for evaluating the effectiveness of silica anti-scalants used to extend the water recovery limits. Procedures enabling meaningful interpretation of silica scaling data on the basis of fimdamental principles are described and illustrated by results of preliminary experiments. Keywords: membranes, reverse osmosis, desalting, silica scale, anti-scalant, inhibitors
The presence of silica in brackish water greatly complicates the reverse osmosis desalting process. Threshold limits of silica scale precipitation are difficult to predict as they are influenced by a large number of parameters. Another difficulty is the lack of a silica anti-scalant that can be confidently used to extend water recovery limits. Moreover, silica scales depositing on a membrane are difficult and costly to remove. The present paper describes the development of laboratory techniques for the determination of the permissible water recovery limits in desalting brackish waters containing silica and for evaluating the effectiveness of silica anti-scalants used to extend the water recovery limits. Procedures enabling meaningful interpretation of silica scaling data on the basis of fimdamental principles are described and illustrated by results of preliminary experiments. Keywords: membranes, reverse osmosis, desalting, silica scale, anti-scalant, inhibitors
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