The colour caused by organic molecules or substances in water starts to lose its effect by being broken down as soon as it comes into contact with ozone. Ozone applications are great solutions for colour removal in wastewater in many industries.
The textile industry is a sector that contains wastewater with intense colour and COD pollution load. Water treatment plants in textile companies face problems in meeting colour and COD discharge standards. The most widely used method in the textile industry is the aerobic biological treatment method, but this method is generally not effective in removing colour in wastewater containing dyestuffs.
Colouring in textile products is a key factor for commercial success. In addition, the colour on the product is washed, light, dry cleaning sweat, etc. Modifications made to the dyestuff structures to increase their resistance to external factors, that is, their fastness, have caused these dyestuffs to show resistance to traditional wastewater treatment systems as well. (O’Neill et al., 1999, Cooper, 1993)
COD and colour removal in textile wastewater requires a high amount of oxidation. For this reason, if a wastewater project is to be carried out in the textile industry, the ozone generator must meet certain standards.
The treatment of many textile companies works 24 hours a day, 7 days a week, and the daily wastewater capacity of a large-scale textile company can reach figures such as 15,000 m3 / day. If ozone is applied at such high flow rates, the contact time of ozone gas with wastewater will be extremely limited.
For this reason, the ozone gas concentration should not be below 11% in the studies to be carried out in textile wastewater. To reach this concentration, the ozone generator MUST be fed with oxygen generators. No ozone gas can be produced in 11% concentration from dry air with any technique or production method in the world.
There are 3 main reasons why ozone gas is used in textile wastewater. These reasons;
1) COD and BOD removal
2) Colour removal
3) Odour removal
But a good ozone gas project is possible ONLY with a good treatment project. The ozone generator is not a purification solution itself, but a supplementary product.
Due to the strong oxidant nature of ozone gas, the success of colour and odour control methods in drinking water has led to an important market in wastewater treatment.
Ozone systems are very low operating costs, no personnel costs. Ozone systems provide 85-98% success in colour removal and 40-55% success in COD removal.
Today, ozone applications in many countries of the world painting, textile, pharmaceuticals and so on. are one of the preferred methods in industrial plants. Ozone is used as “bleach in pulp and paper production, kaolin production and textile production in addition to the applications mentioned above.
The quality of the ozone treatment effluent in terms of colour control depends on:
The best results concerning colour removal are achieved if the wastewater has been previously treated to lower the values of the other characteristics so that the ozone oxidising effect is “consumed” only or at least at a maximum proportion in colour removal. Additionally, the temperature must be below 30-deg C to achieve the best physical conditions for its solubility.
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