| The internal corrosion of water distribution systems causes sanitary and aesthetic problems, such as the dissolution of heavy metals and colouring of water. Tubercule, the by-product of corrosion on the internal surface of pipes, decrease the hydraulic capacity, increase the chlorine demand and foster bacterial activity.; This study conducted in the water distribution system of Laval (Quebec, Canada) was aimed at implementing and following an internal corrosion strategy in a water distribution system. The means chosen was to add sodium silicate type N into the water of an isolated section of the distribution system mainly built of grey iron piping. The addition of this corrosion inhibitor was supposed to: (1) maintain a total iron concentration inferior to 0.2 mg Fe/L for all the sample points during the duration of the study; (2) stabilise the rate of corrosion of a mechanically cleaned pipe; (3) regain a fraction of the hydraulic capacity of old pipes; (4) increase the chlorine stability and reduce the bacterial activity.; To implement and follow the addition of sodium silicate, a section of the distribution system was chosen and isolated. (Abstract shortened by UMI.)... |
