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Water Quality Variation on the Unit Operation of Water Treatment Process When CCPP Index was Controlled for Internal Corrosion of Water Pipes  

Lee, Jae-In (Samyoung Engineering Consultants Co., LTD.)
Kim, Do-Hwan (Samyoung Engineering Consultants Co., LTD.)
Lee, Ji-Hyung (Samyoung Engineering Consultants Co., LTD.)
Kim, Dong-Youn (Samyoung Engineering Consultants Co., LTD.)
Hong, Soon-Heon (Department of Civil Engineering, Miryang National University)
Shin, Pan-Sae (Water Quality Research Institute, Waterworks Headquarter)
Publication Information
Journal of Korean Society of Environmental Engineers / v.27, no.4, 2005 , pp. 362-368 More about this Journal
Abstract
The pH, alkalinity and calcium hardness could be adjusted by $CO_2$, $Ca(OH)_2$, and $Na_2CO_3$ addition in the water treatment process for corrosion protection of the water pipes. This research was performed to investigate the effect on the variation of water quality on the unit process by addition $CO_2$, $Ca(OH)_2$, and $Na_2CO_3$ in water treatment process. Carbon dioxide and lime were added before the coagulation basin and soda ash was added after the BAC process. pH and aklainity were increased at coagulation basin then after the water qualities had sustained similiarly to BAC process. There was no effect on turbidity and DOC removal efficiency during experimental period by addition\ $CO_2$, $Ca(OH)_2$, and $Na_2CO_3$ solution was added into clear well, the last process for optimum control of CCPP and is used mainly to control pH and alkalinity. In this research, average pH, alkalinity, and calcium hardness in treated water were 8.39, 61.4 mg/L as $CaCO_3$, 59.4 mg/L as $CaCO_3$, respectively and CCPP of treated water was higher than 29.5 mg/L to BAC process water, so adjusted water was expected to prevent internal corrosion of water pipe.
Keywords
Water pipe; Internal corrosion; CCPP(Calcium Carbonate Precipitation Potential); Water quality adjustment; Alkalinity; Calcium hardness; Carbon dioxide($CO_2$); Lime($Ca(OH)_2)$); Soda ash($Na_2CO_3$);
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