According to the current state of the art, ozone production materials are classified into air, pure oxygen, and liquid oxygen.
The use of liquid oxygen is generally suitable for small and medium-sized (ozone amount <100g / h), using pure pressure swing adsorption or negative pressure adsorption method to obtain pure oxygen on-site, suitable for the scale of ozone >100g / h. The ozone concentration obtained by using ozone from dry air is generally 1% to 3%; while the concentration of ozone produced by pure oxygen or liquid oxygen is about 10%, and the electricity consumption of ozone by air is about two other methods. 2 times.
Oxidation and disinfection characteristics of ozone generators:
1 Ozone is a highly effective oxidant without secondary pollution. It is the most oxidizing agent in the common oxidizing agent, and its oxidizing ability is twice that of chlorine.
2 Ozone disinfection is less affected by pH, water temperature and ammonia content in water.
3 Ozone removes the smell and taste of microorganisms, aquatic plants, algae and other organic substances, and the effect is good. The decolorization ability is more effective and faster than Cl2 and ClO2.
The addition of ozone to 4 can change the nature and size of the surface charge of small particle size particles, so that the charged small particles can be aggregated. At the same time, in the process of ozone oxidation of dissolved organic matter, there is also "flag flocculation", which has a certain effect on improving the coagulation effect. .
5 ozone disinfection effect is good, the dose is small, the effect is fast, does not produce harmful substances such as ***, and also makes the water have better sensory indicators.
6 Ozone can decompose macromolecular organic matter which is not easily degraded in water into small molecular organic matter, and oxygenate into water to increase dissolved oxygen in water, which provides better conditions for subsequent treatment (especially biological treatment).
In order to avoid the formation of *** difficult to remove, in the water humus, algae, phenol content of the water plant, it is recommended to use ozone for pretreatment. Ozone disinfection in water treatment is slightly higher than the cost of using ClO2, but in terms of water quality, it is better to use ozone generator than ClO2. As far as the economic level is concerned, these two methods for improving water quality are acceptable, and each water plant can adopt corresponding measures according to specific conditions.