Controlling Copper Corrosion in New Construction by Organic Matter Removal (PDF)
- Author(s): Arnold, Roger B., Jr.; Griffin, Allian; Edwards, Marc
- Publications: Journal - American Water Works Association
- Issue Date: May 2012
- Volume / Number: 104, Number 5
- Page(s): E310-E317
- DOI: http://dx.doi.org/10.5942/jawwa.2012.104.0072
- Product Number: JAW_0076010
Non-Member Price: $0
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A new elementary school with persistent elevated copper corrosion
byproduct release evaluated pH increase, orthophosphate dosing,
and granular activated carbon (GAC) treatment as potential
corrosion control measures using bench-scale experiments.
Removal of natural organic matter (NOM) with temporary GAC
treatment facilitated the formation of a copper scale with a
permanently diminished (> 85%) solubility via an accelerated
natural scale-aging process. Increasing the pH and adding a high
dose of orthophosphate were also effective for decreasing copper
release but presented significant long-term drawbacks, and their
benefits were reversed if the treatments were discontinued.
Temporary GAC treatment may be a holistically attractive option
to reduce copper corrosion problems in new construction in
certain waters with high levels of NOM.
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