Advantages and disadvantages of advanced oxidation technology compared with traditional oxidation technology

The e of Wright-Ryder O3 is 2.07V, which is a very strong oxidant. It can effectively remove color, turbidity and odor, and remove pollutants such as phenol, cyanide, sulfide, pesticide and oil in wastewater. There are two ways of O3 oxidation, one is caused by the direct participation of O3 molecules or a single O atom; The other is caused by OH radical produced by O3 decay. The E of OH is 2.8V, second only to F(2.87V), and it is the strongest oxidant in water. It has no selective reaction with almost all pollutants in wastewater, and completely mineralizes some intermediate products such as glycerol, ethanol and acetic acid which cannot be oxidized and decomposed by O3 into CO2 and H2O. Under the irradiation of ultraviolet rays, after O3 is dissolved in water, the following reaction occurs: O3+H2O.

- O2+H2O2

H2O2+H2O-

O2+2OH, O3 and UV cooperate to produce OH, which can also induce a series of chain reactions, produce other ground-state substances and free radicals, strengthen oxidation, and make pollutants degrade quickly and fully. A single O3 oxidation reaction does not produce these substances, and the degradation of pollutants is incomplete.

Because of its remarkable characteristics and unique advantages, advanced oxidation technology has attracted the attention of all countries in the world, and various treatment processes and equipment have been developed one after another, which makes advanced oxidation system have strong vitality, competitiveness and broad application prospects.

According to different oxidants and catalytic conditions, advanced oxidation technologies can usually be divided into six categories: (1) chemical oxidation; (2) chemical catalytic oxidation; (3) wet oxidation; (4) supercritical water oxidation; (5) photochemical oxidation and photochemical catalytic oxidation; (6) Electrochemical oxidation-reduction method.