Using Aeration for Recarbonation of Water After Softening by Lime-Soda Ash
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Abstract
The research focus on using the aeration process as means for water recarbonation after lime-soda softening. The results indicated that aeration efficient for recarbonation of three water samples with different characteristics. The lime-soda softening increased the (pH) values of the three samples to reach (10.08,10.39,10.54) respectively. The aeration decreased these (pH) values to (8.26,8.36,8.23) respectively within (60)minutes. The depression was related to the convert of the hydroxide and carbonate of the sample to the bicarbonate form by CO2 gas absorbed from the air bubbles. The absorption efficiencies were (30.9,31.0,24.7)% for the three samples respectively. The research also determined the value of (pH) at which the softened sample is saturated with calcium carbonate . These values for the three samples were (8.30,8.39,8.44) respectively. Accordingly the Langer saturation index for each sample have a positive value. The samples is at supersaturation condition with calcium carbonate for all samples. Therefore the aeration period needed to obtain the saturation state at which the sample is stable was determined to be (58.8,59.1,55.2)minutes for the three samples respectively.
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References
World Health Organization, 2004, Guidelines for Drinking water quality, vol. 1, Recommendations, 3rd ed., World Health Organization, Geneva .
Kiely G., 1997,Environmental Engineering, McGraw – Hill International (UK) Limited .
Sincero A. and Sincero G., 1996, Environmental Engineering : A Design Approach, Prentice-Hall, New Jersey.
Roalson R. et al., 2003, Enhanced Softening; Effects of Lime Dose and Chemical Additions, J. American Water Work Association, vol. 95, November, Iss. 11. DOI: https://doi.org/10.1002/j.1551-8833.2003.tb10496.x
Davis M. and Masten S., 2004, Principles of Environmental Engineering and Science, McGraw- Hill, New York.
Manahan S., 2005, Environmental Chemistry, 8th ed., CRC Press .
Viessman W. and Hammer M., 1985, Water Supply and Pollution Control, Happer and Row Publishers, New York .
Steel E. and McGhee T., 1979, Water Supply and Sewerage, 5th ed., McGraw- Hill, Kogakusha, Tokyo.
Gullick W. et al., 2000, Occurrence of MTBE in Drinking Water Sources, J. American Water Work Association,vol.92, January, Iss. 1. DOI: https://doi.org/10.1002/j.1551-8833.2000.tb08792.x
Shock R. et al., 2002, California’s First Aeration Plants for Corrosion Control, J. American Water Work Association, vol. 94, March, Iss. 3. DOI: https://doi.org/10.1002/j.1551-8833.2002.tb09437.x
Dixon L. et al., 1991, Evaluating Aeration Technology for Radon Removal, J. American Water Work Association, vol. 83, April, Iss. 4. DOI: https://doi.org/10.1002/j.1551-8833.1991.tb07132.x
Darshan S., 2006, Water Treatment Made Sample for Operators, John Wiley & Sons, New Jersey.
American Water Works Association, 1971, Water Quality and Treatment, 3rd ed., McGraw-Hill, New York.
APHA, AWWA and WPCF, 2005, Standard Methods For the Examination of Water and Wastewater, 20th ed., American Public Health Association, Washington, D.C.
Davis M. and Cornwell D., 1991, Introduction to Environmental Engineering, 2nd ed., McGraw-Hill, New York.
APHA, AWWA and WPCF, 1985, Standard Methods For the Examination of Water and Wastewater, 16th ed., American Public Health Association, Washington, D.C.
Metcalf and Eddy,Inc., 2004, Wastewater Engineering: Treatment and Reuse,4th ed., McGraw-Hill, New York .
Hammer J. and Hammer J., 2004, Water and Wastewater Technology, 5th ed., Prentice-Hall, New Jersey .
Baird C. and Cann M., 2005, Environmental Chemistry, 3th ed., W. H. Freeman and Company, New York.
Brady J. and Senese F., 2004, Chemistry: Matter and Its Changes, 4th ed., John Wiley and Sons, New York .
McGhee J., 1991, Water Supply and Sewerage, 6th ed., McGraw-Hill, New York .