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Internal Corrosion Control of Drinking Water Pipes by pH and Alkalinity Control and Corrosion Inhibitor  

Kuh, Sungeun ((재)한국계면공학연구소)
Woo, Dalsik ((재)한국계면공학연구소)
Lee, Doojin (한국수자원공사, 수자원연구원)
Kim, Juwhan (한국수자원공사, 수자원연구원)
Ahn, Hyowon (한국수자원공사, 수자원연구원)
Moon, Kwangsoon ((재)한국계면공학연구소)
Publication Information
Journal of Korean Society of Water and Wastewater / v.20, no.2, 2006 , pp. 215-223 More about this Journal
Abstract
The internal corrosion of water distribution systems is the main cause for the problem of the public health threat as well as water leakage in the damaged pipeline, red water, and odor and taste of the tap water. This study was examined the effect of chemicals used for pH and alkalinity control and corrosion inhibitors for producing the optimal corrosion control method. Corrosion study at different pH and alkalinity indicated that these control using alkaline chemicals was effective in corrosion rate, Fe release reduction, but examined to be increased in turbidity and corrosion-by-products(TTHMs) problems. The turbidity was slightly increased, requiring caution in controlling corrosion with $Ca(OH)_2$. At pH 9.0, TTHMs concentration is increased two times corn pared with non-control of pH. Using the pipe which had experienced 28 years of exposure, iron release was decreased with the corrosion inhibitor. Consequently, pH, Alkalinity control method using alkaline chemicals must be complemented by corrosion inhibitor application for efficient corrosion control.
Keywords
pH and alkalinity control; Corrosion Inhibitor; Corrosion Rate; Iron Release;
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