Ozone, a new way of sewage treatment
With the economic development, the waste water generated in industrial production increases year by year, and the direct discharge of waste water will cause environmental pollution, which has posed a serious ecological and life threat to many areas of the world.

The current simple and easy wastewater treatment methods are mainly physical methods (precipitation, filtration, adsorption, etc.) and biological methods (using bacteria to decompose pollutants). However, the wastewater treated by these two methods generally cannot meet the discharge standards. In particular, the physical method only transfers the pollutants out of the water, and fails to decompose the harmful substances. The hidden dangers are not eliminated; only the complete decomposition of the harmful substances is the cure.

Ozone is one of the strongest oxidants among natural substances, and its oxidizing ability is second only to strong corrosive fluorine. It can oxidatively degrade various organic substances such as pesticides and dyes into non-toxic carbon dioxide and water, completely eliminate harmful substances in wastewater, and does not produce new secondary pollutants. While ozone decomposes pollutants, it also has the functions of decolorization, deodorization and sterilization. At present, the ozone oxidation method has been applied in the treatment of papermaking wastewater, printing and dyeing wastewater, oil refining wastewater, and coking wastewater.

The problem of ozone oxidation treatment wastewater is that it requires a lot of energy to produce ozone, which also increases the treatment cost. How to improve the oxidation efficiency of ozone is an important problem that needs further research and solution. In recent years, scientists have proposed a combined ozone-ultraviolet oxidation method and ozone-hydrogen peroxide (H2O2) combined oxidation method, which can significantly improve the oxidation efficiency of ozone.

Ozone-ultraviolet-hydrogen peroxide combined oxidation method has also achieved good results. It can oxidize and decompose chlorobenzene, chlorophenol, polychlorinated biphenyl, carbon tetrachloride and other non-degradable substances. Adding manganese, iron, titanium dioxide and other catalysts to the combined oxidative degradation can further improve the oxidation efficiency. Of course, the choice of optimal oxidation conditions also needs further research and improvement.

In short, the prospect of ozone in the treatment of various industrial wastewater is bright, but it also requires scientists to continue to make unremitting efforts for this.
  • Apr 21, 2020
  • Category: News
  • Comments: 0
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