1. Ozone is an excellent oxidant that can kill virus and spores with strong chlorine resistance;

2. Ozone disinfection is less impact on the pH value and temperature of the sewage;

3. Remove the color, smell, taste, and phenol chlorine in the sewage to increase the dissolved oxygen in the water and improve the water quality;

4. Ozone can decompose organic substances and triangular substances that degrade difficult biological degradation, and improve the biochemicality of sewage;

5. Ozone is easy to decompose in water and will not cause secondary pollution due to residues.

Ozone has*sterilization efficiency when drinking water disinfection, but often requires larger ozone volume and longer contact time when using sewage disinfection. The main reason is that there are high pollutants such as COD, NO 2 -N, chroma and suspension in the sewage. These substances consume ozone, reduce ozone’s sterilization capacity. Pre -processing can make ozone disinfection more economical and more effective. The quality of the contact method of ozone and sewage can also affect the amount and disinfection effect of ozone.

1. The impact of water quality is mainly the effects of COD, NO2-N, suspended solid, and chroma on ozone disinfection

2. Ozone increase and the amount of remaining ozone

The amount of remaining ozone plays an important role in disinfection like removal chlorine. When drinking water disinfection, the remaining oxygen concentration is 0.4 mg/L. At this time, drinking water in water can meet the water quality standard requirements. When the sewage disinfection, the remaining remaining Ozone can only have a short time, such as the remaining ozone retention time when the ozone is disinfected by the secondary level of water is only 3-5min. In addition to a small amount of free ozone, the measured remaining oxygen also includes ozone, peroxides and other oxidants. When the water quality is good, the ozone content of the free ozone, the effect of disinfection is good.

3. contact time

The contact time required for ozone disinfection is very short, but this process is also affected by water quality factors. In addition, studies have found that the disinfection effect continues during the stay after the ozone contact. The disinfection effect will not have continuous disinfection after 30 minutes.