Seattle distribution system corrosion control study. Volume 2. Tolt River water pilot plant study
For 6 months, the Seattle Water Department conducted a corrosion treatment pilot plant study, obtaining data on the treatment of Tolt River water with lime/sodium carbonate, lime/sodium bicarbonate, and lime/bicarbonate/silicate. Continuous-flow pipe coupon tests were conducted to determine corrosion rates, penetration rates, and corrosion types for copper, galvanized steel and black steel pipes. Metal leaching tests were conducted using small diameter pipes. Research showed that using lime plus sodium carbonate, lime plus sodium bicarbonate, and lime plus bicarbonate plus silicate will significantly reduce corrosion in home plumbing systems. Based on this pilot study, lime plus sodium carbonate treatment is recommended for the Cedar River water supply at an average dosage of 1.7 mg/L CaO. This dose should achieve an average distribution system pH of 7.9 and an alkalinity of 18 mg/l CaCO3.
- Research Organization:
- Seattle Dept. of Water, WA (USA)
- OSTI ID:
- 6749979
- Report Number(s):
- PB-84-170810
- Country of Publication:
- United States
- Language:
- English
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54 ENVIRONMENTAL SCIENCES
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CARBON COMPOUNDS
CARBONATES
CHALCOGENIDES
CHEMICAL REACTIONS
CONTROL
COPPER
CORROSION
ELEMENTS
FEDERAL REGION X
FUNCTIONAL MODELS
IRON ALLOYS
IRON BASE ALLOYS
METALS
NORTH AMERICA
OXIDES
OXYGEN COMPOUNDS
PILOT PLANTS
PLUMBING
RIVERS
SODIUM CARBONATES
SODIUM COMPOUNDS
STEELS
STREAMS
SURFACE WATERS
TRANSITION ELEMENTS
USA
WASHINGTON
WATER SUPPLY
WATER TREATMENT
ZINC