AWWA ACE69101

The effect of chlorine on copper corrosion was studied in pipe rig experiments according to the German standard DIN 50931-1. Depending on the stagnation time, the dosage of chlorine can decrease or increase the copper release to drinking waters. The presence of chlorine or chloric additives interferes with the copper corrosion due to oxygen. That is why the copper release is lower in shorter stagnation times and higher in longer stagnation times. Therefore, the kinetic of the corrosion process is important. Furthermore, microorganisms have a high influence on copper release from new installation pipes in the first weeks of operation, which is called initialization phase. The microbiological settlement on new copper pipes occurs in a few weeks. The effect of disinfection on hypochlorous acid hindered the settlement on copper pipes, and lower copper concentrations occur in the first weeks of operation. In addition, phosphate has a decreasing influence on the corrosion process in this study also in the chlorinated water. Includes 12 references, tables, figures.