Catalytic ozonation reactor for expanded bed and sewage treatment method of catalytic ozonation reactor

Abstract

The invention discloses a catalytic ozonation reactor for an expanded bed. An ozone distributor, a feedwater distributor and a catalyst bed are sequentially arranged inside the reactor from bottom to top, a tail gas pipe and a sewage outlet pipe are arranged at the upper part of the reactor, a tail gas return pipe is arranged at the tail gas pipe, a sewage return pipe is arranged on the sewage outlet pipe, the tail gas return pipe and the sewage return pipe are respectively communicated with a gas phase inlet and a water phase inlet of a water injector; a return water / gas distributor is arranged between the catalyst bed and the feedwater distributor, and an outlet of the water injector is communicated with the return water / gas distributor by virtue of a pipeline; in an operational process of the reactor, the catalyst bed is in an expanded state under the hydraulic action of feedwater and return sewage. The invention also discloses a sewage treatment method applying the catalytic ozonation reactor for the expanded bed. The sewage treatment method disclosed by the invention has the advantages that sewage treatment depth can be improved, ozone utilization rate can be greatly increased, and tail gas can meet discharge standard requirements, so that the sewage treatment method is environmentally friendly, and resource can be saved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment and relates to ozone catalytic oxidation equipment for sewage treatment, in particular to an expanded bed ozone catalytic oxidation reactor and a sewage treatment method thereof. Background technique [0002] As a strong oxidizing agent, ozone has been widely used in wastewater treatment. In order to improve the utilization rate of ozone and the efficiency of sewage treatment, ozone catalytic oxidation is generally used for sewage treatment. Ozone catalytic oxidation has been successfully applied in advanced sewage treatment, sewage reuse, high-concentration refractory sewage pretreatment, etc. The utilization rate of ozone and sewage treatment efficiency have been greatly improved compared with ozone oxidation alone. However, the current research on ozone catalytic oxidation mainly focuses on the research and development of catalysts. Catalysts with different supports and different acti...

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Problems solved by technology

[0004] (1) After the fixed-bed catalytic reactor has been in operation for a period of time, such as 6 to 7 days, the voids in the catalyst bed and the surface of the catalyst will be blocked or polluted by the suspended solids and colloids brought in by the sewage or produced by the reaction, and the catalyst needs to be cleaned regularly The bed is backwashed; it increases the difficulty of reactor operation, improves the requirements for self-control, and produces a certain amount of backwash wastewater that needs further treatment;

[0005] (2) For fixed-bed catalytic reactors, if the design of water distributors and gas distributors is unreasonable or the precision of processing and installation is not high, and the operation and management are not good, channeling will occur, which will seriously affect the treatment effect;

[0006] (3) Perforated pipes or microporous aeration are mainly used to pass ozone into the sewage. Since the bubbles formed by ozone in the sewage are large and the dissolution rate is low, the utilization rate of ozone is low, and the exhaust gas in the exhaust The ozone content is high; the undissolved and unreacted ozone in the tail gas after the reaction is not recovered, resulting in a waste of ozone;

[0007] (4) Dissolved ozone in the sewage that has no time to react in the future is directly discharged. If the subsequent sewage treatment is connected with a biological treatment unit, the sewage needs to be treated with ozone blow-off. On the one hand, the treatment process is increased, and on the other hand, it causes waste of ozone;

[0008] (5) The residence time of sewage in the reactor is generally 0.5-1.0 hours, and the refractory substances in the middle of the sewage will be discharged before being oxidized, and the reaction depth is not enough, resulting in low sewage treatment efficiency

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