• Title/Summary/Keyword: 탄산칼슘침전능

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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 (수도관 내부부식방지를 위한 CCPP 조절시 정수공정내에서의 수질변화)

  • Lee, Jae-In;Kim, Do-Hwan;Lee, Ji-Hyung;Kim, Dong-Youn;Hong, Soon-Heon;Shin, Pan-Sae
    • Journal of Korean Society of Environmental Engineers
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    • v.27 no.4
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    • pp.362-368
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    • 2005
  • 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.

Effect of corrosive water quality control and corrosion index monitoring in pilot scale pipeline simulator (파일럿 규모 모의관로에서 부식성 수질제어 효과와 부식지수 모니터링)

  • Kim, Do-Hwan;Kim, Yung-Jin;Son, Hee-Jong;Ryou, Dong-Choon;Ahn, Jun-Young;Kim, Cheolyong;Hwang, In-Seong
    • Journal of Korean Society of Water and Wastewater
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    • v.32 no.2
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    • pp.183-192
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    • 2018
  • Applicability of corrosion inhibitor was evaluated using pilot scale water distribution pipe simulator. Calcium hydroxide was used as corrosion inhibitor and the corrosion indices of the water were investigated. Corrosion indices, Langelier saturation index (LI) increased by 0.8 and calcium carbonate precipitation potential (CCPP) increased by 9.8 mg/L. This indicated that corrosivity of water decreased by corrosion inhibitor and the effects lasted for 18 days. Optimum calcium hydroxide dose was found to be 3~5 mg/L for corrosion inhibition. We suggest that monitoring of CCPP as well as LI need to be conducted to control corrosivity of water.