Study on Iron Release with Various Blending of Desalinated Water and Tap Water

Abstract

This study examined effects of various blending ratio of desalinated water and tap water on iron release. Pipe rig tests were conducted to simulate and demonstrate iron release in response to water quality changes. Results show that compare to conventional treated water, desalinated water has a pronounced effect on the iron release in ductile iron pipe; increasing fractions of desalinated water in the blends result in higher total iron release. An increase in pH from 8.0 to 10.0 after 24 hours was found due to alkaline substances (like calcium oxide) releasing from the cement mortar lining and the poor buffering capacity of desalinated water.