Implications of the corrosion index for the quality of flowing tap water and the effects of added alkalinity on corrosion control

초록

Three corrosion indices, Langelier saturation index (LSI), Ryznar index (RI) and calcium carbonate precipitation potential (CCPP), were determined to find whether the corrosive index of flowing tap water could indicate the quality of the water that corresponded to the calculated index value. Water samples were collected from tap water distribution pipe in buildings of Kangwon National University, Korea. Correlations among the LSI, RI and CCPP were also investigated. The effects of alkalinity addition using lime and carbon dioxide on the progress of corrosion were examined in a laboratory-scale simulated water distribution system (SWDS) for 5 months. In the SWDS study, corrosion rate in flowing tap waters was retarded by 12% with the alkalinity addition. The results of the current study confirmed that the corrosion indices are not always the best indicators to predict the quality of the flowing tap water.

키워드