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 JWARP  Vol.9 No.2 , February 2017
Developing a Model for Controlling Internal Corrosion in Water Supply System
Abstract: A model was developed to generate charts that fit the conditions as diverse temperatures and ionic strengths, and that estimate the diversified state of water. The chart can be used as a tool for controlling corrosive waters resulted in internal corrosion and the model producing charts composed of a number of sub modules, and each module incorporated parameters including acidity, alkalinity, pH, and calcium ion. Utilizing the chart water quality of the raw water in G water purification works was estimated to be unsaturated and Langelier index becomes -1.4 which means that the water is highly corrosive and calcium carbonate would not be precipitated. Thus, the water requires treatment as the injection of water stabilizing chemicals to promote an oversaturated (protective) condition. As a result of adding 5 mg/L of lime, it is possible to be precipitated with 5 mg/L, and the water becomes noncorrosive. In addition, when 5 mg/L of caustic soda is added as a conditioning chemical, it signifies to be precipitated with 9 mg/L, and the water also turns out to be largely noncorrosive. Both chemicals are possible to use for the water to be favorable for the formation of a protective film. Optimum injection rate for controlling corrosion can be found by repeating the procedures until the well-conditioned water criteria are satisfied.
Cite this paper: Hwang, B. (2017) Developing a Model for Controlling Internal Corrosion in Water Supply System. Journal of Water Resource and Protection, 9, 183-192. doi: 10.4236/jwarp.2017.92013.
References

[1]   Lim, J.C., Kim, J.K. and Koo, J.Y. (2012) Coating Formation of Water Supply Pipes by Inhibitor and Water Quality Improvement Effect. Journal of the Korean Society of Water and Wastewater, 26, 97-106.
https://doi.org/10.11001/jksww.2012.26.1.097

[2]   Woo, D.S. and Hwang, B.G. (2014) Corrosivity Evaluation of SWRO Membrane Desalted Permeate. Journal of the Korean Society of Civil Engineers, 18, 53-59.
https://doi.org/10.1007/s12205-014-0161-7

[3]   Lee, D.J., Kim, Y.I. and Park, H.A. (2008) Corrosion Control in Water Distribution System Using Lime and Carbon Dioxide. Journal of the Korean Society of Water and Wastewater, 22, 379-388.

[4]   Woo, D.S. and Hwang, B.G. (2008) A Study on the Corrosion Characteristics of Carbon Steel Pipes by Phosphate Corrosion Inhibitor. Journal of the Korea Academia-Industrial Cooperation, 9, 493-499.
https://doi.org/10.5762/KAIS.2008.9.2.493

[5]   Hwang, B.G. (2014) Determination of an Optimum Injection Rate Using Calcium Carbon Saturation Indices for Internal Corrosion Control in Distribution Water Pipe. Journal of the Korean Society of Water Treatment, 22, 11-18.

[6]   Caldwell, D.H. and Lawrence, W.B. (1953) Water Softening and Conditioning Problems. Industrial & Engineering Chemistry, 45, 535-548.
https://doi.org/10.1021/ie50519a027

[7]   Loewenthal, R.E. and Marais, G.R. (1976) Carbonate Chemistry of Aquatic Systems, Vol. I: Theory and Application. Ann Arbor, Michigan.

[8]   Rossum, J.R. and Merrill, D.T. (1983) An Evaluation of the Calcium Carbonate Saturation Indexes. AWWA, 75, 95-100.

[9]   Murrill, D.T. and Sanks, R.L. (1977) Corrosion Control by Deposition of CaCO3 Films: Part 1. A Practical Approach for Plant Operators. AWWA, 69, 592-599.

[10]   Murrill, D.T. and Sanks, R.L. (1977) Corrosion Control by Deposition of CaCO3 Films: Part 2. A Practical Approach for Operators. AWWA, 69, 634-640.

[11]   Murrill, D.T. and Sanks, R.L. (1978) Corrosion Control by Deposition of CaCO3 Films: Part 3. A Practical Approach for Plant Operators. AWWA, 70, 12-18.

[12]   Chapra, S.C. (2012) Applied Numerical Methods with MATLAB for Engineers and Scientists. McGraw Hill.

[13]   Press, W.H., Teukolsky, S.A., Vetterling, W.T. and Flannery, B.P. (1997) Numerical Recipes in Fortran 77. Cambridge University Press, Cambridge.

[14]   Langelier, W.F. (1936) The Analytical Control of Anti-Corrosion Water Treatment. AWWA, 28, 1500.

 
 
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