5) Optimization of parameters such as ozone concentration and time could be selected based on dye concentration in the sample.
It has been demonstrated that ozone oxidation satisfactorily remove the color of tannery wastewater. However, it is an expensive method and Pre-determination of the applied ozone dosage is an important factor for cost effective applications in full-scale Ozonation plants. Under laboratory conditions, sometimes it is observed that the applied ozone can escape through the reactor. However, in full-scale applications, a maximum amount of ozone should be used in the reactions due to economical considerations.
Ozone is effective in removing the color from all dyes used in textile processing. The amount of ozone can vary depending on a number of factors: how much color was removed in the biological process, the type of dye used, where ozone is applied in the process, etc. Knowing the proper amount of ozone required to meet the color removal objective for the receiving water body is critical to the economics of the ozone system. In general it is not easy to predict the amount of ozone required, so in virtually all cases where specific previous experience is not available, pilot testing is employed.
Tosik (2) has shown that about 1 mg ozone/mg dye is required to achieve 95% color removal, although this ratio varies by dye type. The ratio increases to about 1.5 for 100% removal. Reaction times were on the order of 10 minutes. In the textile industry a typical dosage might be 15 mg/l post biological treatment, but the levels could easily reach 25 mg/l. It is important to note that the ozone dose only needs to make the dye compound uncolored and not necessarily completely mineralize the material.
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