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

A technology of ozone catalytic oxidation and sewage treatment, applied in water/sewage treatment, chemical instruments and methods, oxidized water/sewage treatment, etc., can solve the problems of increasing equipment investment and operation difficulty, low sewage treatment efficiency, and pre-oxidation tower efficiency Low-level problems, to achieve the effect of improving the utilization rate of ozone, convenient cleaning, and high utilization rate

Active Publication Date: 2015-04-01
ZHEJIANG CATHAYRIPE ENVIRONMENTAL ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0047] The CODcr of the secondary sedimentation tank of a sewage treatment plant in a chemical enterprise is between 85 and 96 mg / l, while the local CODcr discharge standard for sewage is less than 50 mg / l. After the sewage is biochemically treated, the BOD of the secondary sedimentation tank 5 Less than 8mg / l, B / C value less than 0.1, it is difficult to biochemically treat sewage. Through investigation and expert demonstration, it is planned to adopt the flocculating sand filter + ozone catalytic oxidation treatment process, and carry out verification and comparison tests. The test results show that the CODcr of the sewage is about 80mg / l after the flocculated sand filtration treatment, and the CODcr of the sewage can reach below 50mg / l after the flocculated sand filtration water is treated by ozone catalytic oxidation. For the catalytic oxidation of ozone, comparative experiments of different reactor types were carried out. The comparative experiments were conducted in the ex...

Embodiment 2

[0052] The wastewater reuse device of an oil refinery adopts a double membrane process, and the produced reverse osmosis concentrated water CODcr is between 110-130mg / l, which cannot meet the CODcr less than 50mg / l discharge standard. According to the wastewater quality and the situation of similar projects at home and abroad, the enterprise plans to adopt the ozone catalytic oxidation + biological aerated filter (BAF) process. The catalytic oxidation of ozone is to remove part of CODcr and increase the B / C value of sewage to facilitate subsequent biochemical treatment. In order to ensure the treatment effect, a field verification test was carried out. During the test, the external circulation sewage treatment ozone catalytic oxidation reactor provided by the present invention and the conventional co-current ozone catalytic oxidation reactor (sewage and ozone are all passed through the catalyst from bottom to top) (Bed layer) operation effect, the catalysts packed in the two re...

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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...

Claims

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Application Information

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IPC IPC(8): C02F1/78
CPCC02F1/78C02F2201/002C02F2201/78C02F2301/00C02F2305/00C02F2305/023
Inventor 李光辉王甦董军石淼吴建平杨鹏刘嘉昱范亚斌
Owner ZHEJIANG CATHAYRIPE ENVIRONMENTAL ENG
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