| Summary: | 碩士 === 國立中興大學 === 農業機械工程學系 === 90 === Abstract
This study deals mainly with removing effects of ozone treatment on different concentration levels of artificial ammonium and nitrite. Differences water parameters between the seawater and the freshwater are also compared as both are processed respectively by ozone treatment. The analysis on water parameters includes the remaining ozone concentration, ammonium, nitrite, dissolved oxygen, temperature, pH, total dissolved solids, conductivity and salinity, etc. Finally, from the indoor recirculating water of the aquaculture system in National Wufeng Senior Vocation School of Agriculture and Industry an experiment on the aquaculture pond water processed by a biofilter is also conducted. In this experiment the changes of water qualities before and after processed by ozone are analyzed, and the total number of bacteria in the aquaculture pond is measured in order to find out the sterilizing effects of ozone on the aquaculture water. The experimental results indicate that the ozone generator should be warmed up 30 minutes before conducting the experiment. Pure oxygen with a flow rate 1 L/min then enters the ozone generator for the more accurate experimental data and better machine performance.
Due to the investigation of the ozone treatment,the effect of the variations of water quality is immaterial . The nitrite in the water body can be removed so as to reduce its concentration. However, the effect on the removal of ammonium is significant with the seawater, while it is ineffective with the pure water. Besides, ozone has a significant effect on sterilizing the total number of bacteria in the actual aquaculture water. The results of this experiment can be provided as references for the aquaculture farmers and the researchers in the related fields.
Key words: Ozone、 Nitrite、Ammonium、 Aquaculture、 Total number of bacteria.
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