Corrosion control study of a typical large usage water distribution system
- Army Construction Engineering Research Labs., Champaign, IL (United States)
- ECG, Inc., Vienna, VA (United States)
- Illinois State Water Survey, Champaign, IL (United States)
- Army Center for Public Works, Alexandria, VA (United States)
This corrosion control study was based on, and closely followed, the AWWA Guidance Manual and AWWARF pipe loop protocol. The primary objective of this study was to provide a corrosion control recommendation for the site to satisfy State of Maryland and EPA requirements to define and maintain optimal corrosion control treatment. A second objective was to identify technical and cost constraints that may affect the application of specific corrosion control treatments in finished water. Blended zinc potassium polyphosphate/zinc orthophosphate showed lower corrosion rates and reduced lead concentrations in finished water for the majority of days studied in plant pipe loop models and remote location (barracks) pipe loop models. Blended potassium monophosphate/potassium tripolyphosphate followed a close second in overall efficacy. The pH adjusted and control strategies exhibited little demonstrated corrosion control benefit. Recommendations based on this study included (1) addition of blended zinc potassium polyphosphate/zinc orthophosphate with a residual concentration between 2.0 and 4.5 mg/L, (2) installation of a chemical feed to buffer well water with sodium bicarbonate to stabilize alkalinity when 100% well water is used, and (3) investigation of lime addition to raw well water to control buffer capacity in the combined raw well water/surface water.
- OSTI ID:
- 128633
- Report Number(s):
- CONF-950304--
- Country of Publication:
- United States
- Language:
- English
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