Fenton oxidation method is to generate hydroxyl radical (· oh) with strong oxidation ability in the presence of Fe2 + under acidic conditions, and trigger more other reactive oxygen species to realize the degradation of organic compounds. Its oxidation process is a chain reaction. The generation of · Oh is the beginning of the chain, while other reactive oxygen species and reaction intermediates constitute the nodes of the chain. Each reactive oxygen species are consumed and the reaction chain is terminated. The reaction mechanism is complex. These reactive oxygen species are only used for organic molecules and mineralize them into inorganic substances such as CO2 and H2O. Thus, Fenton oxidation has become one of the important advanced oxidation technologies.
Dissolved air flotation technology is widely used in water supply and drainage and wastewater treatment in recent years. It can effectively remove the light flocs that are difficult to precipitate in wastewater. Large processing capacity, high efficiency, less land occupation and wide application range. It is widely used in sewage treatment of petroleum, chemical industry, printing and dyeing, papermaking, oil refining, leather, steel, mechanical processing, starch, food and so on.