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Copper corrosion in potable water systems: Impacts of natural organic matter and water treatment processes
Copper corrosion was examined in the presence of natural organic matter (NOM) and in situations where NOM was altered by drinking water treatment. Increasing NOM concentration in water tested increased icorr at pH 6.0. The presence of NOM significantly increased copper corrosion byproduct release at pH 6.0, 7.5 and 9.0 in one water tested. Water treated with alum coagulation had higher icorr values than did those coagulation with FeCl3x6H2O. This difference was attributed to the addition of Cl(-) vs SO4(2-) via different coagulants and their differing impacts on scale formation. The presence of NOM did not alter the qualitative effects of alum and FeCl3x6H2O coagulation; however the magnitude of the differences observed between coagulants was lessened. Granular activated carbon (GAC) adsorption increased icorr, whereas ozonation had little or no impact. In the combined alum, ozone, and GAC treatment sequence, alum coagulation usually dominated the overall effect and led to higher icorr values. Because of the interrelationships between NOM concentration, water treatment techniques and copper corrosiveness, compliance with Lead and Copper Rule (LCR) and desinfection byproducts (DBP) regulations must not be addressed independently. Corrosion of metals in natural and treated waters is impacted significantly by the presence of NOM.
Copper corrosion in potable water systems: Impacts of natural organic matter and water treatment processes
Copper corrosion was examined in the presence of natural organic matter (NOM) and in situations where NOM was altered by drinking water treatment. Increasing NOM concentration in water tested increased icorr at pH 6.0. The presence of NOM significantly increased copper corrosion byproduct release at pH 6.0, 7.5 and 9.0 in one water tested. Water treated with alum coagulation had higher icorr values than did those coagulation with FeCl3x6H2O. This difference was attributed to the addition of Cl(-) vs SO4(2-) via different coagulants and their differing impacts on scale formation. The presence of NOM did not alter the qualitative effects of alum and FeCl3x6H2O coagulation; however the magnitude of the differences observed between coagulants was lessened. Granular activated carbon (GAC) adsorption increased icorr, whereas ozonation had little or no impact. In the combined alum, ozone, and GAC treatment sequence, alum coagulation usually dominated the overall effect and led to higher icorr values. Because of the interrelationships between NOM concentration, water treatment techniques and copper corrosiveness, compliance with Lead and Copper Rule (LCR) and desinfection byproducts (DBP) regulations must not be addressed independently. Corrosion of metals in natural and treated waters is impacted significantly by the presence of NOM.
Copper corrosion in potable water systems: Impacts of natural organic matter and water treatment processes
Korrosion von Kupfer in Trinkwassersystemen: Einfluß der natürlichen organischen Begleitstoffe und der Wasserbehandlungsprozesse
Rehring, J.P. (author) / Edwards, M. (author)
Corrosion, Houston ; 52 ; 307-317
1996
11 Seiten, 10 Bilder, 5 Tabellen, 16 Quellen
Article (Journal)
English
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