10.2190/Q310-C60A-QYH5-1PYY Q310C60AQYH51PYY 3 Nitrification of Aquacultural Water by Ozonation in a Packed Bed Reactor 151 164 20020509 20020509 20020509 20020509 Q310C60AQYH51PYY.pdf http://baywood.metapress.com/link.asp?target=contribution&id=Q310C60AQYH51PYY 2 S. H. Lin C. M. Huang Yuan Ze Institute of Technology, Taiwan Nitrite removal of aquacultural water by ozonation in a packed bed reactor was investigated. The rate of nitrite removal was determined in terms of the liquid and gas flow rates, pH, and ozone and nitrite concentrations. It was also found that an optimum pH around 7 exists for maximum nitrite removal. The experimental results also indicated that the nitrite removal increases with an increase in the inlet ozone concentration and with a decrease in both the nitrite concentration and liquid flow rate. In all circumstances, ozonation was found capable of efficiently reducing and maintaining the nitrite concentrations below 0.25 mg/L, a concentration level required generally for aquacultural activity. These results can be applied in the design of aquaculture systems with high fish density. P. B. Liao and R. D. Mayo, Intensified Fish Culture Combining Water Reconditioning with Pollution Abatement, <i>Aquaculture, 3</i>, pp. 61-85, 1972. G. Otte and H. Rosenthal, Management of Closed Brackish Water System for High Density Fish Culture by Biological and Chemical Water Treatment, <i>Aquaculture, 18</i>, pp. 169-194, 1979. M. G. Poxton and S. B. Allhouse, Water Quality Criteria for Marine Fisheries, <i>Aquacultural Engineering, 1</i>, pp. 153-191, 1982. G. Kruner and H. Rosenthal, Efficiency of Nitrification in Trickling Filter Using Different Substrates, <i>Aquacultural Engineering, 2</i>, pp. 49-76, 1983. J. Bovendeur, E. H. Eding, and A. M. Henken, Design and Performance of a Water Recirculation System for High-density Culture of the African Catfish, <i>Aquaculture, 63</i>, pp. 329-352, 1987. Anonymous, Use of Ozone in Sea Water for Cleasing Shellfish, <i>Effluent Water Treatment Journal, 12</i>, pp. 260-262, 1972. W. J. Blogoslawski, C. Brown, E. W. Rhodes, and M. Broadhurst, Ozone Disinfection of Seawater Supply System, in <i>Proceedings First International Symposium on Ozone for Water and Wastewater Treatment</i>, Cleveland, Ohio, 1975. K. Honn and W. Chavin, Utility of Ozone Treatment in the Maintenance of Water Quality in a Closed Marine System, <i>Marine Biology, 34</i>, pp. 201-209, 1976. APHA, <i>The Standard Methods for Water and Wastewater Examination</i> (17th Edition), American Public Health Association, Washington, D. C., 1992. W. L. McCabe, J. C. Smith, and P. Harriott, Unit Operations of Chemical Engineering (4th Edition), McGraw-Hill, New York, 1987. D. E. Sullivan and J. A. Roth, Kinetics of Ozone Self-decomposition in Aqueous Solution, <i>AIChE Symposium Series, 76</i>, pp. 142-150, 1980. M. D. Gurol and P. C. Singer, Kinetics of Ozone Decomposition: A Dynamic Approach, <i>Environmental Science and Technology, 7</i>, pp. 377-384, 1982.