Ozone oxidation and air flotation combined treatment system and process

Abstract

The invention relates to an ozone oxidation-air floatation combined treatment system and a process. The system comprises a reaction tank, a gas liquid mixer, a catalyst adding device and a whirl stream air floating tank. Ozone-containing gas and sewage are mixed into a gas-liquid mixture containing micro bubbles by the gas liquid mixer and then fed into the reaction tank. The reaction tank is provided with at least one ultrasonic wave cavitation device. The catalyst adding device is used for feeding a catalyst, ozone and the sewage into the reaction tank together. Then a catalytic oxidation reaction is performed under the action of ultrasonic wave cavitation. A stream guide pipe is vertically disposed in the center of the whirl stream air floating tank. The upper end of the stream guide pipe is open, and the lower end of the stream guide pipe penetrates the bottom of the whirl stream air floating tank. The bottom of the whirl stream air floating tank is also provided with a sewage outlet. The bottom of the stream guide pipe is provided with vortex plates. The whirl stream air floating tank is communicated with the reaction tank, and used for allowing the gas liquid mixture reacted in the reaction tank to react continuously under the whirl stream function and to be subjected to floatation, washing and separation treatment. The contact probability of the micro bubbles generated by the system with contaminants is large, the reaction is more thorough, the ozone utilization rate is high, retention time is short, and contaminant removing effects are good.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an ozone oxidation and air flotation combined treatment system and process. Background technique [0002] In industrial production, especially in oil fields, refineries, petrochemical, metallurgy, steel, paper and other production industries, a large amount of sewage containing oil and organic matter and other pollutants is produced, which has caused great harm to the environment. With people's emphasis on environmental protection, the state has become more stringent on sewage treatment and discharge standards, and has put forward higher requirements for sewage treatment equipment. [0003] In the advanced treatment of sewage, ozone-based oxidation technology, especially advanced ozone oxidation technology, is more and more widely used to reduce organic matter, chroma, turbidity and bacteria in water, but most of the currently used ozone oxidation contact reactors are ad...

AI Technical Summary

Problems solved by technology

However, there are two main problems in ozone flotation at present. First, the traditional air flotation process is still used. The air flotation effect is poor, the ozone utilization rate is low, the residence time is too long, and the floor area is large. Second, the ozone utilization method Simple, only change the original air flotation gas source to ozone, and only rely on ozone to oxidize itself, resulting in strong oxidation selectivity and insufficient oxidation ability, and can only degrade part of the pollutants, poor versatility

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