Diverse applications and precautions of ozone oxidation in water treatment
When it comes to ozone (O3), the first thing that comes to mind is that it is an allotrope of oxygen and is widely present in the natural atmosphere, protecting us from the harm of ultraviolet rays. However, ozone is more widely used in the field of environmental protection. Its excellent ozone oxidation performance makes it the nemesis of difficult-to-degrade organic matter in water bodies. By combining with other processes, ozone can deeply treat wastewater to ensure that it meets emission standards. So, who is it that makes ozone generator shine in the field of water treatment? Next, let us explore the answer together.
Principle of ozone oxidation technology
In wastewater treatment, there are two main ways of oxidation reaction between O3 and pollutants: direct oxidation and indirect oxidation. Direct ozone oxidation refers to the direct chemical reaction between O3 molecules and pollutants; while indirect oxidation is to decompose O3 through technical means to generate hydroxyl radicals, which then undergo oxidation reaction with organic matter. These two methods have their own advantages, but both demonstrate the powerful power of ozone in water treatment.
Factors affecting ozone oxidation
In wastewater treatment, there are two main ways of oxidation reaction between O3 and pollutants: direct oxidation and indirect oxidation. Direct oxidation refers to the direct chemical reaction between O3 molecules and pollutants; while indirect oxidation is to decompose O3 through technical means to generate hydroxyl radicals, which then undergo oxidation reaction with organic matter. These two methods have their own advantages, but both demonstrate the powerful power of ozone in water treatment.
Although ozone has a significant effect on COD removal, its utilization efficiency is not always satisfactory in actual industrial applications. This is mainly because other pollutants in wastewater, such as chromaticity and suspended solids, will consume a large amount of O3, thereby extending the dosage of O3 and the reaction time. In addition, the method of O3 addition and the amount of water-soluble ozone will also affect the effect of ozone oxidation.
The amount of O₃ added is a key factor affecting the effect of ozone on COD removal. In industry, the ratio of O₃ to COD in water is usually maintained in the range of 2 to 4:1. At the same time, the actual amount of O₃ dissolved in water will also significantly affect the COD removal rate. There is a specific ozone oxidation threshold. When the concentration of ozone dissolved in water is lower than this threshold, the effect of ozone on COD removal is almost negligible. This threshold will vary depending on the water quality.
