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Wastewater treatment catalytic ozonation reactor for fluidized bed and wastewater treatment method of wastewater treatment catalytic ozonation reactor

A technology of ozone catalytic oxidation and sewage treatment, applied in the direction of oxidized water/sewage treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of low sewage treatment efficiency, small specific surface area of ​​catalyst, and affecting treatment effect, etc. Achieve the effects of improving ozone utilization rate and sewage treatment depth, improving mass transfer capacity and treatment effect, and avoiding channeling phenomenon

Inactive Publication Date: 2015-04-29
ZHEJIANG CATHAYRIPE ENVIRONMENTAL ENG
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) Due to the limitations of the reactor conditions, etc., the particle size of the catalyst used is 2-8m, and the particle size is relatively large, resulting in a small specific surface area of ​​the catalyst and poor reactivity, which affects the treatment effect;
[0007] (2) Perforated pipes or microporous aeration are mainly used to pass ozone into sewage. Ozone forms large bubbles in sewage and has a low dissolution rate, resulting in low ozone utilization rate and low ozone content in the exhaust gas. more;
[0009] (4) When the fixed bed catalyst oxidation reactor is used, channeling will occur if the design of the water distributor and gas distributor is unreasonable or the processing and installation accuracy is not high or the operation management is poor, which will seriously affect the treatment effect
[0010] (5) 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, ozone is generated. waste of
[0011] (6) 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 before being oxidized in the future. The reaction depth is not enough, resulting in low sewage treatment efficiency

Method used

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  • Wastewater treatment catalytic ozonation reactor for fluidized bed and wastewater treatment method of wastewater treatment catalytic ozonation reactor
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  • Wastewater treatment catalytic ozonation reactor for fluidized bed and wastewater treatment method of wastewater treatment catalytic ozonation reactor

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Experimental program
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Embodiment 1

[0051] The effluent CODcr of the final sedimentation tank of sewage biochemical treatment in a printing and dyeing enterprise is about 100mg / l and the chroma is about 50. The enterprise requires that the CODcr is less than 60mg / l and the chroma is less than 20. For this reason, carried out this stock sewage ozone catalytic oxidation test, during the test, compared the fluidized bed ozone catalytic oxidation reactor provided by the present invention and conventional fixed bed catalytic oxidation reactor operation effect, the catalyst that two cover reactors are loaded Both are activated alumina-supported catalysts. The particle size of the catalyst loaded in the fluidized bed ozone catalytic oxidation reactor is 1.5-2.0mm, and the particle size of the catalyst loaded in the fixed-bed ozone catalytic oxidation reactor is 4.0-6.0mm. is 0.5 hours, and the operation results are shown in Table 1.

[0052] Table 1. Comparative test results of fluidized bed ozone catalytic oxidation r...

Embodiment 2

[0057] The CODcr of coking wastewater from a steel plant is about 100mg / l after biochemical treatment, and the enterprise requires that the CODcr of the discharged sewage is less than 60mg / l. To this end, the ozone catalytic oxidation test of this unit of sewage was carried out to verify whether the ozone catalytic oxidation process can achieve up-to-standard discharge. During the test, the fluidized bed ozone catalytic oxidation reactor provided by the present invention was compared with the conventional fixed bed catalytic oxidation reactor operation effect, and the catalysts loaded in the two sets of reactors were active alumina supported catalysts, and the fluidized bed ozone The particle size of the catalyst loaded in the catalytic oxidation reactor is 1.5-2.0mm, the particle size of the catalyst loaded in the fixed-bed ozone catalytic oxidation reactor is 4.0-6.0mm, the test scale is 0.5m3 / h, and the hydraulic retention time is 0.5 hours. See Table 2 for the running resu...

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Abstract

The invention discloses a wastewater treatment catalytic ozonation reactor for a fluidized bed. The wastewater treatment catalytic ozonation reactor for the fluidized bed comprises a reactor housing, wherein an external cylinder is arranged in the housing, an internal cylinder is arranged in the external cylinder, the top part of the internal cylinder is lower than that of the external cylinder, the bottom of the internal cylinder is lower than that of the external cylinder; a baffling channel is formed between the bottom of the external cylinder and the inner wall of the housing, a refluxing channel is formed between the bottom of the internal cylinder and the inner wall of the external cylinder. According to the wastewater treatment catalytic ozonation reactor for the fluidized bed disclosed by the invention, a catalytic reaction region, a diversion region and a precipitation region can be arranged in the same reactor so as to realize integration without needing additional catalyst separation and back conveying equipment. The invention also discloses a wastewater treatment method with application of the wastewater treatment catalytic ozonation reactor. According to the wastewater treatment method disclosed by the invention, by virtue of wastewater refluxing, residual soluble ozone in wastewater is fully utilized, and the ozone utilization ratio and the wastewater treatment depth are greatly increased.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment and relates to sewage treatment equipment, in particular to a fluidized bed sewage treatment ozone catalytic oxidation reactor and a sewage treatment method thereof. Background technique [0002] As a strong oxidant, ozone is widely used in wastewater treatment, but ozone has problems such as high treatment cost and strong reaction selectivity. The advanced ozone oxidation technology developed on the basis of ozonation, through auxiliary chemical and The physical method promotes the decomposition of ozone to generate hydroxyl radicals and accelerates the decomposition reaction of organic pollutants. This technology has the advantages of high efficiency, thoroughness, wide application range, and less secondary pollution. As one of the advanced ozone oxidation technologies, ozone catalytic oxidation has developed rapidly due to its good treatment effect and simple operation. The ozone catal...

Claims

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Application Information

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IPC IPC(8): C02F1/78
CPCC02F1/78C02F2201/78C02F2301/02
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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