Catalytic ozonation reactor for treatment of external circulating wastewater and wastewater treatment method

Abstract

The invention discloses a catalytic ozonation reactor for treatment of external circulating wastewater. A tail gas pipe and a wastewater outlet pipe are arranged on a reactor, and are provided with reflux pipes; a tail gas reflux pipe and a wastewater reflux pipe are respectively communicated to a gas-phase inlet and a water-phase inlet of a water ejector; and an outlet of the water ejector is communicated with the inside of a reactor through a pipeline. The invention also discloses a wastewater treatment method. By virtue of the catalytic ozonation reactor for treatment of the external circulating wastewater, processed wastewater and tail gas are refluxed; and the ozone dissolved in the wastewater and the residual ozone in the tail gas are fully utilized to carry out catalytic oxidization reaction again, so that the wastewater treatment depth is improved; the ozone utilization rate is greatly improved; and the wastewater treatment depth is improved.

Description

Technical field [0001] The invention belongs to the technical field of sewage treatment, and relates to an ozone catalytic oxidation reactor for sewage treatment, especially an ozone catalytic oxidation reactor for sewage and tail gas circulation, and specifically an ozone catalytic oxidation reactor for sewage treatment with external circulation and a sewage treatment method. Background technique [0002] In order to cope with the deteriorating ecological environment, the country has continuously promulgated stricter environmental protection standards, and the requirements for sewage treatment have also been continuously improved. In the current situation of serious water pollution and shortage of water resources, energy conservation and emission reduction, sewage discharge up to standards and sewage reuse have become an important task for production enterprises. In the past, the traditional sewage treatment technology has been unable to meet the increasingly stringent sewage di...

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Problems solved by technology

[0007] (1) The undissolved and reacted ozone in the tail gas after the sewage reaction is not recovered, and is discharged after being treated by the ozone decomposer, resulting in a waste of ozone;

[0008] (2) Dissolved ozone in the sewage that will not be able to react in the future is directly discharged. If the subsequent sewage treatment is connected with a biological treatment unit, it is necessary to perform aeration and other treatments on the sewage to blow off the ozone. On the one hand, the treatment process is increased, and on the other hand Aspects cause the waste of ozone;

[0009] (3) The residence time of the sewage in the reactor is generally 0.5 to 1.0 hours. Some refractory substances in the sewage will be discharged after being oxidized. The reaction depth is not enough, resulting in low sewage treatment efficiency.

Its disadvantage is still to increase the equipment investment and operation difficulty, and after the ozone concentration (content) in the tail gas from the catalytic oxidation tower is reduced, the oxidation in the pre-oxidation tower is weakened, so the efficiency of the pre-oxidation tower is low. By increasing this Tower to improve ozone utilization is not economically advantageous compared with its investment

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