Optimizing of silicate dosing in Vest-Adger

Summary

Sodium silicate has been recommended as alternative to liming if the aim is rapid detoxification of inorganic monomeric aluminium in acid waters. Silicate is expensive, however, and optimal dosing is extremely important. Unsatisfactory water chemical results in four tributaries to limed salmon rivers have revealed a need for dosing optimization. In this report we suggest actions in all four dosing installations in order to improve the water chemistry results. On a longer-term, transferring from sodium silicate to terrestrial liming or lime-dosing is recommended at all sites.