Evaluating Water Stability Indices from Water Treatment Plants in Baghdad City

Awatif S. Alsaqqar, Basim H. Khudair^*, Sura Kareem Ali

Department of Civil Engineering, College of Engineering, Baghdad University, Baghdad, Iraq.

DOI: 10.4236/jwarp.2014.614124                

Abstract

Corrosion control is an important aspect of safe drinking water supplies. The effects of corrosion which may not be evident without monitoring are an important issue concerning both public health and economical aspects. Chemical stability parameters of water quality in water treatment plants in Baghdad city can improve drinking water quality. The treated water quality from water treatment plants in Baghdad city was investigated along the water flow path in this study. The water quality parameters related to chemical stability included temperature, alkalinity as mg/L CaCO₃, calcium mg/L as Ca, pH and total dissolved solids (TDS) mg/L for different samples from WTPs within Baghdad city were investigated. The two water quality indices, Langelier saturation index (LSI) and the Ryznar stability index (RSI), were calculated in order to evaluate the chemical stability of the drinking water samples. The results of LSI and RSI of the effluents from Baghdad’s WTPs during 2000-2013 classified that corrosive water is produced and this indicates that the water is not safe for domestic use and will need the further treatment. The present study demonstrated the application of water stability indices in estimating/understanding the treated water chemical stability and appeared to be promising in the field of treated water quality management.

Keywords

Water Stability Indices, Chemical Stability, Langelier Index, Ryznar Index

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	Qasim, S.R., Edward, M.M. and Guany, Z. (2000) Planning, Design, and Operation. Prentice Hall PTR. Upper Saddle River, NJ07458.
[2]	AWWA (1971) Water Quality and Treatment. 3rd Edition, McGraw Hill Book Company, New York.
[3]	Australian Drinking Water Guidelines (1996) National Water Quality Management Strategy. NHMRC and ARMCANZ, Canberra.
[4]	Imran, S.A., Dietz, J.D., Mutoti, G., Taylor, J.S., Randall, A.A. and Cooper, A.C.D. (2005) Red Water Release in Drinking Water Distribution System. American Water Works Association, 97, 93-100.
[5]	Fang, W. (2004) The Research on Water Chemical Stabilization and Control Methods in the Urban Water Supply System. Hunan University, Changsha.
[6]	Salvato, J.A., Dee, P.E., Nemerow, N.L. and Agardy, F.J. (2003) Environmental Engineering. John Wiley & Sons, Inc., Hoboken.
[7]	Rossum, J.R. and Merrill, D.T. (1983) An Evaluation of the Calcium Carbonate Saturation Indexes. Journal of American Water Works Association, 75, 95-100.
[8]	MWH (2005) Water Treatment Principles and Design. 2nd Edition, John Wiley & Sons, Inc., Hoboken.
[9]	Millette, J.R., Hammonds, A.F., Pansing, M.F., Hansen, E.C. and Clark, P.J. (1980) Aggressive Water: Assessing the Extent of the Problem. American Water Works Association, 72, 262-266.
[10]	Pisigan Jr., R.A. and Singley, J.E. (1985) Effects of Quality Parameters on the Corrosion of Galvanized Steel. American Water Works Association, 77, 76-82.
[11]	Pisigan Jr., R.A. and Singley, J.E. (1987) Influence of Buffer Capacity, Chlorine Residual and Flow Rate on Corrosion of Mild Steel and Copper. American Water Works Association, 79, 62-70.
[12]	Reiber, S.H., Ferguson, J.F. and Benjamin, M.M. (1987) Corrosion Monitoring and Control in the Pacific Northwest. American Water Works Association, 79, 71-74.
[13]	Al-Adili, A.S. (1998) Geotechnical Evaluation of Baghdad Soil Subsidence and Their Treatments. Ph.D. Thesis, University of Baghdad, Baghdad.
[14]	Water Service LTD (2004) Indexes for Calcium Carbonate. [e-mail]
[15]	Gebbie, P. (2000) Water Stability: What Does It Mean and How Do You Measure It? Proceedings of the 63th Annual Water Industry Engineers and Operators Conference, Warrnambool, 6-7 September 2000, 50-58.
[16]	Schock, M.R. (1989) Understanding Corrosion Control Strategies for Lead. American Water Works Association, 81, 88-100.
[17]	Kawamura, S. (2000) Integrated Design and Operation of Water Treatment Facilities. 2nd Edition, John Wiley & Sons, Inc., New York.
[18]	Hadi, M. (2010) Development Software for Calculation of Eight Important Water Corrosion Indices. Proceedings of the 12th National Conference on Environmental Health, Tehran.