Domestic sewage treatment—–Ozone decolorization and deodorization of water bodies

In order to better solve the problem of sewage, secondary treatment and reuse, ozone treatment technology plays an important role in water treatment. Ozone removes pollutants such as color, odor and phenolic chlorine in sewage, increases dissolved oxygen in water, and improves water quality.

Domestic sewage contains high levels of organic matter, such as ammonia, sulfur, nitrogen, etc. These substances carry active genes and are prone to chemical reactions. Ozone is a strong oxidant that oxidizes a variety of organic and inorganic substances. Using the characteristics of strong oxidation of ozone, injecting a certain concentration of ozone into the sewage, can effectively eliminate the odor and deodorizing. After deodorization, ozone is easily decomposed in water, and it does not cause secondary pollution. Ozone can also prevent the re-generation of odor. Ozone deodorization produces a large amount of oxygen, forming an oxygen-rich environment and causing odorous substances. It is difficult to produce odor in an aerobic environment.

When sewage treatment is used as a water reuse, if the discharged sewage contains a high chroma, for example, if the color of the water is greater than 30 degrees, the water needs to be decolorized, sterilized, and deodorized. At present, common methods include decondensation and sedimentation, sand filtration, adsorption decolorization, and ozone oxidation.

The general coagulation sedimentation and sand filtration process is not able to achieve sufficient water quality standards, and the precipitated sludge needs secondary treatment. Adsorption decolorization has selective decolorization, needs frequent replacement, and the price is high.

Ozone is a very strong oxidant, has strong adaptability to chromaticity, high decolorization efficiency, and strong oxidative decomposition effect on colored organic matter. The colored organic matter is generally a polycyclic organic substance having an unsaturated bond. When treated with ozone, the unsaturated chemical bond can be opened to break the bond, thereby making the water clearer. After ozone treatment, the chroma can be reduced to below 1 degree. Ozone plays a key role in the reuse of reclaimed water.

Post time: Jul-27-2019