10.2190/PAJK-D8T6-MW57-D8VQ PAJKD8T6MW57D8VQ 6 Cost-Benefit Analysis of Cooling Water Treatment by Ozonation 385 394 20020509 20020509 20020509 20020509 PAJKD8T6MW57D8VQ.pdf http://baywood.metapress.com/link.asp?target=contribution&id=PAJKD8T6MW57D8VQ 4 Sheng H. Lin Yuan Ze Institute of Technology, Taiwan A cost-benefit analysis of the treatment of cooling water by ozonation was performed for a cogeneration plant of a large cement company. The economic viability of the ozonation process was assessed by comparing the cost of the new cooling water treatment system with that of the conventional chemical treatment process. It was found that the payback of the ozonation treatment is highly dependent on the cycle of concentration of the cooling water system. The ozonation treatment system was found to be economically attractive for the cycle of concentration exceeding ten, a level easily realizable in practice. In the extreme case, with complete elimination of all treatment chemicals, the payback period of the ozonation treatment system is merely thirteen months. Besides the economic advantages, the ozonation treatment process also has other operational and environmental benefits which are not easy to quantify, and are not considered in the analysis. J. W. McCoy, <i>The Chemical Treatment of Cooling Water</i>, Chemical Publishing Co., New York, 1976. R. Burger, <i>Cooling Tower Technology</i>, Fairmont Press, Atlanta, Georgia, 1990. S. I. Monshaw, Non-Chromates Vie for a Cooling Water Niche, <i>Chemical Engineering</i>, pp. 59-62, September 1989. M. F. Humphrey and K. R. French, <i>Cooling Tower Water Conditioning Study</i>, JPL Publication 79-104, Jet Propulsion Laboratory, Pasadena, California, 1979. O. Leitzke, G. Greiner, N. Murray, and K. Rohleder, Ozone Treatment of Surface Water to Provide High Quality Cooling Water and Process Water, <i>Ozone Science and Engineering, 2</i>, pp. 229-239, 1980. H. B. Edwards, Ozone—An Alternative Method of Treating Cooling Tower Water, <i>Journal of the Cooling Tower Institute, 8</i>, pp. 10-21, 1987. N. T. Kaiga, T. Seki, and K. Iyasu, Ozone Treatment in Cooling Water Systems, <i>Ozone Science and Engineering, 11</i>, pp. 325-331, 1989. J. T. Echols and S. T. Mayne, Cooling-Water Cleanup by Ozone, <i>Chemical Engineering</i>, pp. 163-168, May 1990. A. Pryor and M. Bukay, Water Conservation through Cooling Tower Ozonation, <i>Ultrapure Water, 7</i>, pp. 24-29, 1990. S. H. Lin and K. L. Yeh, Cooling Water Treatment by Ozonation, <i>Chemical Engineering and Technology, 16</i>, pp. 273-278, 1993. Ozonair International Corporation, <i>Company Report</i>, 1989. Asia Cement Company, <i>Internal Report</i>, 1993.