CN210214909U

CN210214909U - Ozone catalytic oxidation reactor

Info

Publication number: CN210214909U
Application number: CN201920570335.5U
Authority: CN
Inventors: Erhua Zhao; 赵二华; Jianxia Yang; 杨建峡; Yunfei Yu; 余云飞; Shihui Yang; 杨世辉
Original assignee: CISDI Engineering Co Ltd; CISDI Technology Research Center Co Ltd
Current assignee: CISDI Engineering Co Ltd; CISDI Technology Research Center Co Ltd
Priority date: 2019-04-24
Filing date: 2019-04-24
Publication date: 2020-03-31
Anticipated expiration: 2029-04-24

Abstract

The utility model belongs to the technical field of wastewater treatment, and relates to an ozone catalytic oxidation reactor, wastewater to be treated enters a micro bubble generator to be mixed with ozone generated by an ozone generator, an ultraviolet tube, an aeration disc, a catalyst layer and a water distribution device are sequentially arranged in the reactor body from top to bottom, a second ozone exhaust pipe and a first ozone exhaust pipe are respectively connected between the ozone generator and the aeration disc as well as between the ozone generator and the micro bubble generator, the micro bubble generator is connected with the water distribution device through a water inlet pipe, a back flush water inlet pipe is also connected on the water distribution device, the upper part of the reactor body is connected with a drain pipe with a drain valve and a back flush drain valve respectively, the top of the reactor body is connected with a tail gas discharge pipe of a tail gas destructor, the ozone catalytic oxidation reactor is distributed through a reasonable structure, so that ozone is dispersed in the form of micro bubbles and is fully, the utilization rate and the reaction efficiency of the ozone are improved under the catalytic action of the catalyst and the synergistic action of ultraviolet rays.

Description

Ozone catalytic oxidation reactor

Technical Field

The utility model belongs to the technical field of waste water treatment, a ozone catalytic oxidation reactor is related to.

Background

Along with the increasing national environmental standards and the stricter environmental requirements, the importance of wastewater treatment is increasingly prominent, and the requirements on the quality of treated wastewater effluent are gradually increased. Ozone has extremely strong oxidizing power, and the oxidation-reduction potential of the ozone in water is 2.07 eV. Ozone can oxidize most inorganic substances and organic substances, is used for treating industrial wastewater, can effectively remove the organic substances in the wastewater, reduces BOD and COD in the wastewater, and has obvious effects on decolorization and deodorization. When the ozone directly oxidizes the organic matters, one is the direct oxidation of the ozone, and the oxidation process is slow and has obvious selectivity; the other is that ozone is catalyzed and decomposed to generate hydroxyl free radicals which indirectly react with organic matters in water, and the reaction is quite quick and has no selectivity. The two kinds of ozone oxidation or ozone catalytic oxidation are developed rapidly due to good treatment effect and simple operation, and industrial cases are available in the ozone oxidation or the ozone catalytic oxidation.

Ozone oxidation or ozone catalytic oxidation mainly adopts perforated pipe or micropore aeration mode at present to let in ozone in the sewage, because ozone forms the bubble great in the sewage, and the dissolution rate is lower to lead to ozone low-usage, the ozone content is more in the exhaust tail gas.

In order to improve the utilization rate of ozone and the efficiency of sewage treatment, the mode of catalytic oxidation of ozone is generally adopted for sewage treatment at present. The ozone catalytic oxidation has been successfully applied to the aspects of sewage advanced treatment, sewage reuse, high-concentration biochemical-resistant sewage pretreatment and the like, and the ozone utilization rate and the sewage treatment efficiency are greatly improved compared with the single ozone oxidation. However, the research on catalytic oxidation of ozone is mainly focused on the research and development of catalysts, and catalysts with different carriers and loaded with different active components are developed, for example, catalysts which are developed by taking activated carbon, activated alumina, molecular sieves and the like as carriers, loaded with more than ten active components such as MnO, CuO, ZnO, TiO2, CeO2, SeO2 and the like in different combinations are developed; the developed catalysts have different application ranges and different treatment effects. Research and development of various research institutions focuses on developing high-efficiency catalysts to improve the ozone utilization rate and the sewage treatment efficiency, and few research and design develop high-efficiency reactors to improve the ozone utilization rate and the sewage treatment efficiency. The reactors researched and applied at present are mainly two types, one is that sewage/ozone flows in the same direction and passes through a reactor catalyst bed layer from bottom to top from the bottom of the reactor to generate catalytic oxidation reaction; the other one is that sewage/ozone reversely flows, the sewage flows through a catalyst bed layer of the reactor from top to bottom, and the ozone flows through the catalyst bed layer of the reactor from bottom to top to generate catalytic oxidation reaction.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides an ozone catalytic oxidation reactor for solve prior art and improve the problem of ozone utilization ratio and sewage treatment efficiency through developing high efficiency reactor seldom.

In order to achieve the above purpose, the utility model provides an ozone catalytic oxidation reactor, from left to right include pipeline connection's ozone generator in proper order, the microbubble generator, reactor body and tail gas destroyer, pending waste water gets into the ozone mixture that microbubble generator and ozone generator produced, ultraviolet tube has set gradually from top to bottom in the reactor body, the aeration dish, catalyst layer and water distribution device, be connected with the second ozone blast pipe between ozone generator and the aeration dish, be connected with the first ozone blast pipe between ozone generator and the microbubble generator, microbubble generator and water distribution device are through the inlet tube connection of taking the water inlet pipe valve, still be connected with the back flush inlet tube of taking the back flush valve on the water distribution device, reactor body upper portion is connected with the drain pipe of taking water discharge valve and back flush water discharge valve respectively, reactor body top is connected with the tail gas delivery pipe, the end part of the tail gas discharge pipe is connected with a tail gas destructor.

The beneficial effect of this basic scheme lies in: the ozone generator is used for generating ozone, the microbubble generator is used for fully mixing wastewater to be treated with the ozone, and the catalyst in the catalyst layer in the reactor body is used for catalyzing the ozone to carry out oxidation reaction so as to decompose and remove pollutants in the wastewater. The ultraviolet rays generated by the ultraviolet lamp tube and the ozone dispersed by the aeration disc play a role in decomposing pollutants in the wastewater in cooperation with the ozone in the catalyst layer. The backwashing water inlet pipe with the backwashing valve and the water outlet pipe with the backwashing water discharge valve are cooperatively matched to play a role in cleaning the catalyst layer in the reactor body, so that the catalyst layer is prevented from being blocked.

Further, the thickness of the catalyst layer is 1/2-2/3 of the reactor body, the aeration discs are located at the top of the catalyst layer by 0.5-1.0 m and are uniformly distributed in the reactor body. Has the advantages that: the aeration discs are uniformly distributed on the top of the catalyst in the reactor body, and play a role in uniformly dispersing the ozone flowing out of the aeration discs.

Furthermore, the back washing water inlet pipe is communicated with the water inlet pipe and is controlled to be opened and closed by a back washing valve and a water inlet pipe valve respectively. Has the advantages that: the backwashing water inlet pipe is communicated with the water inlet pipe of the reactor, and the backwashing valve and the water inlet pipe valve are controlled to be opened, so that the reactor body and the micro-bubble generator are respectively cleaned.

Furthermore, the water distribution device is close to the bottom of the body, and the water distribution device adopts one of a long-handle filter head, a short-handle filter head or a perforated water distribution plate. Has the advantages that: the long-handle filter head, the short-handle filter head or the perforated water distribution plate is beneficial to enabling ozone-dispersed wastewater to uniformly enter a catalyst layer of the reactor body from bottom to top.

Further, the ultraviolet lamp tubes are uniformly arranged on the inner wall of the reactor body and are located 0.3-1 m above the aeration disc, and the ultraviolet lamp tubes adopt low-pressure mercury lamps. Has the advantages that: the ultraviolet light with the wavelength of 250-280 nm has better catalytic effect.

Furthermore, the upper part of the reactor body is connected with a drain pipe, and the drain pipe is communicated with two drain pipe branches respectively provided with a drain valve and a back flush drain valve. Has the advantages that: the drainage trend is controlled by controlling the opening of the drainage valve and the back-flushing drainage valve, and the drainage is convenient to collect respectively.

Furthermore, the catalyst in the catalyst layer is a molecular sieve catalyst, the catalyst is one of quartz sand, brick slag, steel slag, active carbon, a molecular sieve or alumina, and the active component is one or a combination of more of Mn, Fe and Cu transition metal oxides. Has the advantages that: the molecular sieve catalyst with the pore diameter of 2-8 mm can exert the optimal catalytic effect of the catalyst.

Further, the aeration disc adopts a micropore aeration disc or a micro-nano generator, and the diameter of bubbles dispersed by the aeration disc is 30-100 um. Has the advantages that: the micro-bubbles dispersed by the aeration disc can be uniformly dispersed in the reactor body to cooperatively oxidize pollutants in the wastewater, so that the decomposition effect of the pollutants in the wastewater is improved.

A sewage treatment method based on an ozone catalytic oxidation reactor comprises the following steps:

A. after being pressurized by a booster pump, wastewater to be treated is added into a micro-bubble generator, one part of ozone generated by an ozone generator enters the micro-bubble generator along a first ozone exhaust pipe, the other part of ozone enters an aeration disc along a second ozone exhaust pipe, after the wastewater to be treated and the ozone are mixed in the micro-bubble generator, the ozone is dissolved in the wastewater by micro-bubbles of 30-100 um, a valve of a water inlet pipe is opened, a back-flushing valve is closed, the wastewater after the ozone is dissolved enters a catalyst layer along a water distribution device, and an ozone catalytic oxidation reaction is carried out under the action of a molecular sieve catalyst in the catalyst layer to remove pollutants in the wastewater;

B. ozone dispersed from the aeration disc is dissolved in the wastewater of the catalyst layer in a form of micro bubbles of 30-100 um, and ultraviolet rays generated by ultraviolet lamp tubes on the aeration disc synergistically degrade pollutants in the wastewater, so that the pollutants in the wastewater are sufficiently subjected to oxidation reaction for degradation;

C. opening a drain valve on a drain pipe branch, closing a back-flushing drain valve, discharging the wastewater without pollutants along the drain pipe branch with the drain valve for collection, and discharging the ozone which is not subjected to oxidation reaction into the atmosphere after entering a tail gas destructor along a tail gas discharge pipe at the top of the reactor body;

D. after the reactor body runs for 6-7 days, in order to prevent the catalyst layer from being blocked, backwashing is needed to be carried out on the catalyst layer, when the catalyst layer is backwashed, the water inlet pipe valve and the water discharge valve are closed, the backwashing valve and the backwashing water discharge valve are opened, clean water is flushed from the backwashing water inlet pipe, and the cleaned wastewater is collected by the water discharge pipe branch with the backwashing water discharge valve.

The beneficial effects of the utility model reside in that:

1. the ozone catalytic oxidation reactor disclosed by the utility model has the advantages that through the reasonable structural layout, ozone enters the reactor body through micro bubbles with the diameter of 30-100 um, and the retention time of the ozone in wastewater is prolonged; the wastewater passes through the catalyst layer, and micro-bubble ozone dissolved in the wastewater generates more oxidizing substances to degrade pollutants in the wastewater under the catalytic action of the catalyst; after the oxidation of the catalyst layer, undegraded organic matters or incompletely oxidized organic matters are further removed through the synergistic effect of micro-bubble ozone and ultraviolet rays dispersed by the aeration disc, ozone is put in at multiple points, the contact time of pollutants and ozone in the wastewater is prolonged, the oxidation efficiency of the ozone is improved, and the problem of low ozone utilization rate in the prior art is solved.

2. The utility model discloses an ozone catalytic oxidation reactor, reasonable in design, ozone that ozone generator produced divides twice to add to the reactor body, dissolved ozone and the ozone that the aeration dish dispersed in the make full use of waste water, and supreme transmission is followed to the waste water that contains ozone, ozone in the aeration dish is from last to transmission down, ozone in the waste water is carried the time length, the treatment effect is good, the degree of depth reaction of ozone in the waste water has been improved, more traditional catalytic oxidation reactor, ozone utilization ratio has improved 30%, can be used for the advanced treatment of sewage, fields such as sewage recycle and the difficult biochemical sewage preliminary treatment of high concentration.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and/or combinations particularly pointed out in the appended claims.

Drawings

For the purposes of promoting a better understanding of the objects, features and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic structural diagram of the catalytic ozonation reactor of the present invention.

Reference numerals: the device comprises an ozone generator 1, a first ozone exhaust pipe 2, a second ozone exhaust pipe 3, a micro-bubble generator 4, a water inlet pipe 5, a water inlet pipe valve 6, a water distribution device 7, a backwashing valve 8, a backwashing water inlet pipe 9, a reactor body 10, a catalyst layer 11, an aeration disc 12, an ultraviolet lamp tube 13, a drain pipe 14, a drain valve 15, a backwashing drain valve 16, a tail gas discharge pipe 17 and a tail gas destructor 18.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the features in the following embodiments and examples may be combined with each other without conflict.

Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in any way limiting the scope of the invention; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc., indicating directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limiting the present invention, and those skilled in the art can understand the specific meanings of the terms according to specific situations.

The catalytic ozonation reactor shown in fig. 1 sequentially comprises an ozone generator 1, a micro-bubble generator 4, a reactor body 10 and a tail gas destructor 18 which are connected by a pipeline from left to right, wherein the reactor body 10 is a closed cylindrical reactor, wastewater to be treated enters the micro-bubble generator 4 to be mixed with ozone generated by the ozone generator 1, an ultraviolet lamp tube 13, an aeration disc 12, a catalyst layer 11 and a water distribution device 7 are sequentially arranged in the reactor body 10 from top to bottom, the ultraviolet lamp tube is uniformly arranged on the inner wall of the reactor body 10 and is located 0.3-1 m above the aeration disc 12, the ultraviolet lamp tube 13 adopts a low-pressure mercury lamp, and the effective wavelength of ultraviolet is 250-280 nm. The ultraviolet light with the wavelength of 250-280 nm has better catalytic effect. The thickness of the catalyst layer 11 is 1/2-2/3 of the reactor body 10, the catalyst in the catalyst layer 11 is a molecular sieve catalyst, the aperture of the molecular sieve catalyst is 2-8 mm, the catalyst is one of quartz sand, brick slag, steel slag, active carbon, a molecular sieve or alumina, and the active ingredient is one or a combination of more of Mn, Fe and Cu transition metal oxides. The molecular sieve catalyst with the pore diameter of 2-8 mm can exert the optimal catalytic effect of the catalyst. The aeration discs 12 are located at the top of the catalyst layer by 0.5-1.0 m, and the aeration discs 12 are uniformly distributed in the reactor body 10. The aeration discs 12 are uniformly distributed on the top of the catalyst in the reactor body 10, and play a role in uniformly dispersing the ozone flowing out of the aeration discs 12. The aeration disc 12 adopts a micropore aeration disc or a micro-nano generator, and the diameter of bubbles emitted by the aeration disc is 30-100 um. The micro bubbles dispersed by the aeration disc 12 can be uniformly dispersed in the reactor body 10 to cooperatively oxidize pollutants in the wastewater, so that the decomposition effect of the pollutants in the wastewater is improved. The water distribution device 7 is close to the bottom of the body, and the water distribution device 7 adopts one of a long-handle filter head, a short-handle filter head or a perforated water distribution plate. The long-handle filter head, the short-handle filter head or the perforated water distribution plate is helpful for the wastewater with ozone dispersed to enter the catalyst layer of the reactor body 10 from bottom to top evenly.

A second ozone exhaust pipe 3 is connected between the ozone generator 1 and the aeration disc 12, a first ozone exhaust pipe 2 is connected between the ozone generator 1 and the micro-bubble generator 4, the micro-bubble generator 4 is connected with the water distribution device 7 through a water inlet pipe 5 with a water inlet pipe valve, the water distribution device 7 is also connected with a back flush water inlet pipe 5 with a back flush valve 8, the upper part of the reactor body 10 is connected with a water discharge pipe 14, and the water discharge pipe 14 is communicated with two water discharge pipe branches with a water discharge valve 15 and a back flush water discharge valve 16 respectively. The drainage trend is controlled by controlling the opening of the drainage valve 15 and the back washing drainage valve 16, and the drainage is convenient to collect respectively. The back washing water inlet pipe 9 is communicated with the water inlet pipe 5 and is controlled to be opened and closed by a back washing valve 8 and a water inlet pipe valve 6 respectively. The backwashing water inlet pipe is communicated with the water inlet pipe of the reactor, and the backwashing valve and the water inlet pipe valve are controlled to be opened, so that the reactor body and the micro-bubble generator are respectively cleaned. The top of the reactor body 10 is connected with a tail gas discharge pipe 17, and the end of the tail gas discharge pipe 17 is connected with a tail gas destructor 18.

The ozone generator 1 is used for generating ozone, the microbubble generator 4 is used for fully mixing wastewater to be treated with the ozone, and the catalyst in the catalyst layer 11 in the reactor body 10 is used for catalyzing the ozone to perform oxidation reaction so as to decompose and remove pollutants in the wastewater. The ultraviolet rays generated by the ultraviolet lamp 13 and the ozone dispersed by the aeration disc 12 act in cooperation with the ozone in the catalyst layer 11 to decompose pollutants in the wastewater. The backwashing water inlet pipe 9 with the backwashing valve 8 and the water outlet pipe 14 with the backwashing water outlet valve 16 cooperate to clean the catalyst layer 11 in the reactor body 10, so that the catalyst layer 11 is prevented from being blocked. Through setting up reasonable structural configuration for ozone looses with the microbubble, fully contacts with waste water, and throws with the multiple spot and throw, improves ozone utilization ratio and reaction efficiency under the catalytic action of catalyst and ultraviolet synergism.

Example (b):

A. the wastewater to be treated is pressurized by a booster pump and then added into a micro-bubble generator 4, ozone 2/3 generated by an ozone generator 1 enters the micro-bubble generator 4 along a first ozone exhaust pipe 2, ozone 1/3 enters an aeration disc 12 along a second ozone exhaust pipe 3, the wastewater to be treated and the ozone are mixed in the micro-bubble generator 4, the ozone is dissolved in the wastewater by micro-bubbles of 30-100 microns, a water distribution device 7 which is 0.5m away from the bottom of a reactor body 10 uniformly distributes the wastewater in the reactor body 10, and the water distribution device 7 selects a long-handle filter head. Opening a valve of a water inlet pipe 5, closing a back flush valve 8, enabling the wastewater after ozone dissolution to enter a catalyst layer 11 along a water distribution device 7, and performing an ozone catalytic oxidation reaction under the action of a molecular sieve catalyst in the catalyst layer 11 to remove pollutants in the wastewater, wherein the catalyst is the molecular sieve catalyst, an aeration disc 12 is arranged at a position 0.5m above the catalyst layer 11, and the aeration disc 12 is a micropore aeration disc;

B. ozone dispersed from the aeration disc 12 is dissolved in the wastewater of the catalyst layer 11 in the form of micro bubbles of 30-100 um, and ultraviolet rays generated by the ultraviolet lamp tubes 13 on the aeration disc 12 synergistically degrade pollutants in the wastewater, so that the pollutants in the wastewater are sufficiently subjected to oxidation reaction for degradation;

C. opening a drain valve 15 on a branch of a drain pipe 14, closing a back flush drain valve 16, discharging the wastewater with pollutants removed along the branch of the drain pipe 14 with the drain valve 15 for collection, and discharging ozone which does not undergo oxidation reaction into a tail gas destructor 18 along a tail gas discharge pipe 17 at the top of the reactor body 10 and then discharging the ozone into the atmosphere;

D. after the reactor body 10 runs for 6-7 days, in order to prevent the catalyst layer 11 from being blocked, backwashing needs to be carried out on the catalyst layer 11, when the catalyst layer 11 is backwashed, the valve of the water inlet pipe 5 and the drain valve 15 are closed, the backwash valve 8 and the backwash drain valve 16 are opened, clean water is flushed from the backwash water inlet pipe 9, and the drain pipe branch with the backwash drain valve 16 collects the cleaned wastewater.

Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the scope of the claims of the present invention.

Claims

1. An ozone catalytic oxidation reactor is characterized by sequentially comprising an ozone generator, a micro bubble generator, a reactor body and a tail gas destroyer which are connected by pipelines, wastewater to be treated enters the micro bubble generator to be mixed with ozone generated by the ozone generator, an ultraviolet lamp tube, an aeration disc, a catalyst layer and a water distribution device are sequentially arranged in the reactor body from top to bottom, a second ozone exhaust pipe is connected between the ozone generator and the aeration disc, a first ozone exhaust pipe is connected between the ozone generator and the micro bubble generator, the micro bubble generator is connected with the water distribution device through a water inlet pipe with a water inlet pipe valve, a backwashing water inlet pipe with a backwashing valve is also connected to the water distribution device, the upper part of the reactor body is connected with a water outlet pipe with a water outlet valve and a backwashing water outlet valve respectively, and the top of the reactor body is connected with a tail gas discharge pipe, the end part of the tail gas discharge pipe is connected with a tail gas destructor.

2. The ozonation catalytic oxidation reactor of claim 1, wherein the thickness of the catalyst layer is 1/2-2/3 of the reactor body, the aeration discs are located at the top of the catalyst layer by 0.5-1.0 m, and the aeration discs are uniformly distributed in the reactor body.

3. The catalytic ozonation reactor of claim 1, wherein the backwash water inlet pipe is communicated with the water inlet pipe and is controlled to open and close by a backwash valve and a water inlet pipe valve respectively.

4. The ozonation catalytic oxidation reactor of claim 1, wherein the water distribution device is near the bottom of the body, and the water distribution device is one of a long-handle filter head, a short-handle filter head, or a perforated water distribution plate.

5. The catalytic ozonation reactor of claim 1, wherein the ultraviolet lamp tubes are uniformly arranged on the inner wall of the reactor body and are positioned 0.3-1 m above the aeration disc, and the ultraviolet lamp tubes adopt low-pressure mercury lamps.

6. The catalytic ozonation reactor of claim 1, wherein a drain pipe is connected to the upper portion of the reactor body, and two drain pipe branches with a drain valve and a back flush drain valve are connected to the drain pipe in a penetrating manner.

7. The catalytic ozonation reactor of claim 1, wherein the catalyst in the catalyst layer is a molecular sieve catalyst, the catalyst is one of quartz sand, brick slag, steel slag, activated carbon, molecular sieve or alumina, and the active component in the catalyst is one or a combination of several of transition metal oxides of Mn, Fe and Cu.

8. The catalytic ozonation reactor of claim 1, wherein the aeration disc is a microporous aeration disc or a micro-nano generator, and bubbles dispersed by the aeration disc have a diameter of 30-100 μm.