CN215049321U - Advanced oxidation reaction system for wastewater treatment - Google Patents
Advanced oxidation reaction system for wastewater treatment Download PDFInfo
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- CN215049321U CN215049321U CN202121282647.XU CN202121282647U CN215049321U CN 215049321 U CN215049321 U CN 215049321U CN 202121282647 U CN202121282647 U CN 202121282647U CN 215049321 U CN215049321 U CN 215049321U
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Abstract
The utility model relates to an advanced oxidation reaction system for wastewater treatment, this system includes: a water inlet device (1) for introducing wastewater into the reaction system; the reaction tank (2) is used for carrying out oxidation reaction, and a catalyst for the oxidation reaction is filled in the reaction tank (2); the dosing device (3) is used for adding reagents required by the reaction into the reaction tank (2), and the reagents comprise oxidizing agents; the water outlet device is used for leading the treated wastewater out of the reaction system, and comprises at least one set of membrane module (41) used for separating the catalyst from the wastewater. Compared with the prior art, the utility model has the advantages of the treatment effect is good, can retrieve catalyst, operating efficiency is high.
Description
Technical Field
The utility model relates to a waste water treatment field, concretely relates to advanced oxidation reaction system for waste water treatment.
Background
Heterogeneous catalytic oxidation refers to a process in which pollutants react with an oxidant and are removed on the surface of a catalyst in a mechanical stirring or fluid stirring manner, and the catalyst promotes the oxidant to generate free radicals to effectively oxidize and mineralize the pollutants.
The prior known wastewater oxidation process has no process and equipment for performing wastewater treatment catalytic oxidation by using a powdery catalyst. Catalysts are generally expensive, and waste caused by loss of the catalysts after repeated use needs to be reduced, so that the cost of wastewater treatment is reduced. In the existing chemical catalytic reaction, solid-liquid separation is usually carried out through an independent metal filter to recover the catalyst, the filter is required to be manually cleaned to recycle the catalyst, so that the catalyst is easy to lose in the cleaning process of the filter, the risk of wastewater leakage is also increased, and meanwhile, the concentration of the catalyst is reduced due to the filtration of the catalyst, so that the catalyst is not suitable for continuous operation of wastewater treatment
And the conventional polymer filter element such as PP cotton is used, and the fiber filter not only needs an independent filter device, but also cannot completely recover the catalyst after filtration, so that the loss of the catalyst is caused, and the cost for treating wastewater is increased. The independent filtration system often results in separation of the catalyst from the reactor, failing to ensure constant catalyst concentration in the reactor, and is not conducive to effective wastewater treatment.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the defects of the prior art and providing an advanced oxidation reaction system for wastewater treatment, which has good treatment effect, can recover the catalyst and has high operation efficiency.
The purpose of the utility model can be realized through the following technical scheme:
the utility model is an integrated catalytic oxidation reactor, which realizes catalytic oxidation, and the catalyst and the wastewater are separated synchronously, thereby ensuring that each parameter is constant during the reaction, being beneficial to the reaction and being generally used as the pretreatment of biochemical reaction; the reactor is based on an immersed membrane reactor and an external membrane reactor, and the specific scheme is as follows;
an advanced oxidation reaction system for wastewater treatment, the system comprising:
the water inlet device is used for guiding the wastewater into the reaction system;
the reaction tank is used for carrying out oxidation reaction, and a catalyst for the oxidation reaction is filled in the reaction tank;
the dosing device is used for adding reagents required by the reaction into the reaction tank, and the reagents comprise oxidizing agents;
and the water outlet device is used for guiding the treated wastewater out of the reaction system and comprises at least one set of membrane module for separating the catalyst from the wastewater.
The water inlet device adopts water pumps with different forms and different materials according to different water qualities; the reaction tank can be a reactor in any form, the properties are not strictly limited, and materials in different forms can be selected according to different water qualities, so that the reactor can be used for a long time.
The catalyst particles are 100 meshes and 1000 meshes, and the specific type of the catalyst is HACO-p of Shanghai Qintai environmental science and technology Limited;
the membrane component comprises a metal membrane, a ceramic membrane, an organic polymer material membrane and the like, and can be an ultrafiltration membrane, a microfiltration membrane or a filter with larger pore diameter, the filtration pore diameter of the membrane component is 0.02-50 mu m, the membrane component is used as a filtration system of a catalyst to realize the separation of the catalyst and wastewater, and the material of the membrane can be an inorganic membrane or an organic membrane.
Furthermore, a pretreatment device is arranged in front of the reaction tank and used for removing particles in the wastewater; the pretreatment device comprises a filter and/or an oil-water separator.
The main purpose of the pretreatment device is to remove large particles and possibly some substances which are unfavorable to the reaction, such as mineral oil and the like;
the filter removes larger hard impurities in water to reduce damage to the membrane, and is usually a metal fine grid with the pore diameter of less than 4mm, and multi-medium filtration is carried out;
the oil-water separator removes excessive floating oil in water, and can be any device for realizing oil-water separation, such as an oil separation tank, a vacuum oil filter and the like.
Further, the reaction tank is internally provided with:
a mixing unit for efficiently contacting the catalyst with the oxidizing agent and the wastewater;
the mixing unit can be one or the combination of a plurality of mechanical stirring, aeration stirring or pump circulation stirring;
and/or a control unit for controlling any parameters related to the reaction conditions, such as temperature, pH, catalyst concentration, liquid level or oxidant concentration in the reaction tank, oxidant adding mode and the like.
Further, the mixing unit comprises a stirring paddle and/or an aeration disc, and the aeration disc is connected with an aeration fan;
the control unit comprises a pH controller and/or a liquid level controller.
Further, the dosing device comprises an oxidant storage tank and/or a catalyst storage tank and/or a pH regulator storage tank and/or a membrane cleaning agent storage tank.
Of course, if necessary, each storage tank is matched with a corresponding charging pump; and the pH regulator storage tank can be linked with the pH control unit to further accurately regulate the pH in the reaction tank.
Furthermore, the water outlet device also comprises a water producing pump, and the water producing pump is connected with the membrane module.
The water producing pump produces negative pressure through controlling the water producing mode of the pump and the water producing and pausing modes, and water is pumped out from the central pipe of the membrane component.
Further, the membrane module is positioned in the reaction tank, and the water production pump is connected with the downstream direction of the membrane module.
Further, the membrane module is positioned outside the reaction tank, and the water producing pump is connected to the upstream direction of the membrane module.
Furthermore, the water outlet device also comprises a membrane backwashing unit, and the membrane backwashing unit comprises a membrane backwashing pump and/or a membrane backwashing fan and/or a membrane scouring fan.
Furthermore, the membrane backwashing pump and/or the membrane backwashing fan are connected with the membrane assembly, and the backwashing direction is opposite to the water outlet direction of the reaction system;
a membrane backwashing pump and/or a membrane backwashing fan remove catalyst particles on the surface of the membrane component by utilizing staged water and/or gas backwashing, and the membrane component is cleaned; strictly speaking, the water flow and air flow direction are on the back side of the membrane, namely the side opposite to the side where the catalyst is trapped;
the membrane scouring fan is connected with one surface of the membrane component for intercepting the catalyst.
The membrane scouring fan scours the surface of the membrane component, and the enrichment and stacking of catalyst particles on the surface of the membrane component are reduced.
Compared with the prior art, the utility model has the advantages of it is following:
(1) in the utility model, the reaction system can effectively treat pollutants in the wastewater, can also recover the catalyst, solves the problem of secondary pollution such as a large amount of sludge generated in the traditional Fenton oxidation process, has good wastewater treatment effect, can repeatedly utilize the catalyst, and saves materials;
(2) the process of the utility model can be automatically controlled and operated without manual intervention, thereby greatly improving the operation efficiency of the system; the stable catalyst concentration, oxidant concentration, stable hydraulic retention time and optimized reaction conditions in the system can be ensured;
(3) in the utility model, the filter removes the hard substances with the thickness of more than 4mm, thereby ensuring that the membrane is not damaged by the hard substances, and the liquid level control ensures the stable water level and ensures the stable hydraulic retention time and the stable oxidation reaction time;
the aeration disc, the catalyst mixing pump or the mechanical stirrer ensures that the catalyst cannot precipitate and can be effectively mixed and oxidized in water, and the dosing pump sets a certain dosing amount to ensure the optimized stable oxidant reaction concentration in the reactor;
the pore diameter of the membrane component is usually less than 10 μm and is far smaller than catalyst particles, so that the catalyst can be retained in the reactor, the loss of the catalyst is not caused, and the stable concentration of the catalyst in the reactor can be ensured;
(4) in the utility model, the water producing pump forms negative pressure by pumping the water through the pump, the catalyst can be intercepted on the outer surface of the membrane, and the water enters the central tube of the membrane through the filtering holes on the surface of the membrane to realize the separation of solid and liquid, so that the reaction and the solid-liquid separation are carried out simultaneously, and the more effective catalytic oxidation treatment of the wastewater is promoted;
selecting a mode of externally arranging a membrane, as shown in fig. 5, wherein water flow passes through the membrane in a lifting and extruding mode of a water outlet pump, part of catalyst can be intercepted on the membrane, and the catalyst is returned to the inside of the system through backwashing of a backwashing pump and/or blowing-off of a fan, so that the stability of the concentration of the catalyst in the reaction process is maintained;
that is, if the membrane is submerged, suction is used, and if the membrane is externally arranged, lifting extrusion is used; namely, for the immersion type, aeration scouring and backwashing are needed, and the catalyst is recovered through water backwashing and gas backwashing which are externally arranged;
the membrane backwashing pump and the fan intermittently backwash water and air to ensure that the catalyst falls off on the membrane surface, so that the membrane is not blocked and the stable concentration of the catalyst in the reactor is ensured;
the membrane scouring fan provides air aeration to shake the hollow fiber powder to reduce the concentration of the catalyst on the surface of the membrane, so that the catalyst is recycled and the concentration in the reactor is stable.
Drawings
FIG. 1 is a schematic view of a reaction system in example 1;
FIG. 2 is a graph showing the effect of the reaction in example 1;
FIG. 3 is a schematic view of a reaction system in example 2;
FIG. 4 is a graph showing the effect of the reaction in example 2;
FIG. 5 is a schematic view of a reaction system in example 3;
the reference numbers in the figures indicate: the device comprises a water inlet device 1, a filter 11, a reaction tank 2, a stirring paddle 21, a liquid level controller 22, an aeration disc 23, a pH controller 24, a dosing device 3, a water outlet device, a membrane assembly 41, a water production pump 42, a membrane backwashing pump 43, a membrane backwashing fan 44 and a membrane scouring fan 45.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
An advanced oxidation reaction system for wastewater treatment, the system comprising: a water inlet device 1 for introducing wastewater into the reaction system; the reaction tank 2 is used for carrying out oxidation reaction, and a catalyst for the oxidation reaction is filled in the reaction tank 2; a chemical adding device 3 for adding a reagent required by the reaction into the reaction tank 2, wherein the reagent comprises an oxidizing agent; and the water outlet device is used for guiding the treated wastewater out of the reaction system, and comprises at least one set of membrane module 41 for separating the catalyst from the wastewater.
The water inlet device 1 adopts water pumps with different forms and different materials according to different water qualities; the reaction tank can be a reactor in any form, the properties are not strictly limited, and materials in different forms can be selected according to different water qualities, so that the reactor can be used for a long time. The catalyst particles are 100 meshes and 1000 meshes, and the specific type of the catalyst is HACO-p of Shanghai Qintai environmental science and technology Limited; the membrane component 41 comprises a metal membrane, a ceramic membrane, an organic polymer material membrane and the like, and can be an ultrafiltration membrane, a microfiltration membrane or a filter with larger aperture, the filtering aperture of the membrane component 41 is 0.02-50 mu m, the membrane component is used as a filtering system of a catalyst to realize the separation of the catalyst and wastewater, and the material of the membrane can be an inorganic membrane or an organic membrane.
Preferably, a pretreatment device is arranged in front of the reaction tank 2 and used for removing particulate matters in the wastewater; the pre-treatment means comprise a filter 11 and/or a de-oiler. The main purpose of the pretreatment device is to remove large particles and possibly some substances which are unfavorable to the reaction, such as mineral oil and the like; the filter 11 removes larger hard impurities in water to reduce damage to the membrane, and is usually a metal fine grid with the pore diameter of less than 4mm, and is filtered by multi-media;
the oil-water separator removes excessive floating oil in water, and can be any device for realizing oil-water separation, such as an oil separation tank, a vacuum oil filter and the like.
Preferably, the reaction tank 2 is provided with: a mixing unit for efficiently contacting the catalyst with the oxidizing agent and the wastewater; the mixing unit can be one or the combination of a plurality of mechanical stirring, aeration stirring or pump circulation stirring; and/or a control unit for controlling any parameters related to the reaction conditions, such as temperature, pH, catalyst concentration, liquid level or oxidant concentration, oxidant feeding manner, etc., in the reaction tank 2.
More preferably, the mixing unit comprises a stirring paddle 21 and/or an aeration disc 23, the aeration disc 23 being connected to an aeration fan; the control unit includes a pH controller 24 and/or a level controller 22.
Preferably, the dosing device 3 comprises an oxidant reservoir and/or a catalyst reservoir and/or a pH regulator reservoir and/or a membrane cleaning agent reservoir. Of course, if necessary, each storage tank is matched with a corresponding charging pump; and the pH regulator storage tank can be linked with the pH control unit to further accurately regulate the pH in the reaction tank 2.
Preferably, the water outlet device further comprises a water production pump 42, and the water production pump 42 is connected with the membrane module 41. The water producing pump 42 generates negative pressure by controlling the water producing mode of the pump and the water producing and pausing modes, and pumps out the produced water from the central pipe of the membrane module 41.
The water outlet apparatus further comprises a membrane backwash unit comprising a membrane backwash pump 43 and/or a membrane backwash fan 44 and/or a membrane scour fan 45. The membrane backwashing pump 43 and/or the membrane backwashing fan 44 are/is connected with the membrane component 41, and the backwashing direction is opposite to the water outlet direction of the reaction system; the membrane backwashing pump 43 and/or the membrane backwashing fan 44 removes catalyst particles on the surface of the membrane module 41 by means of staged water and/or gas backwashing, and cleans the membrane module 41; strictly speaking, the water flow and air flow direction are on the back side of the membrane, namely the side opposite to the side where the catalyst is trapped; the membrane scouring fan 45 is connected to the side of the membrane module 41 that traps catalyst. The membrane scouring fan 45 scours the surface of the membrane module 41, reducing the enrichment and stacking of catalyst particles on the surface of the membrane module 41.
First, the membrane module 41 may be located in the reaction tank 2, and the product water pump 42 is connected in the downstream direction of the membrane module 41. Secondly, the membrane module 41 may be located outside the reaction tank 2, and the water producing pump 42 is connected to the upstream direction of the membrane module 41.
Example 1
An advanced oxidation reaction system for wastewater treatment, as shown in fig. 1, comprising: a water inlet device 1 for introducing wastewater into the reaction system; the reaction tank 2 is used for carrying out oxidation reaction, and a catalyst for the oxidation reaction is filled in the reaction tank 2; a chemical adding device 3 for adding a reagent required by the reaction into the reaction tank 2, wherein the reagent comprises an oxidizing agent; and the water outlet device is used for guiding the treated wastewater out of the reaction system, and comprises at least one set of membrane module 41 for separating the catalyst from the wastewater.
The water inlet device 1 adopts water pumps with different forms and different materials according to different water qualities; the reaction tank can be a reactor in any form, the properties are not strictly limited, and materials in different forms can be selected according to different water qualities, so that the reactor can be used for a long time.
A pretreatment device is arranged in front of the reaction tank 2 and used for removing particles in the wastewater; the pre-treatment means comprise a filter 11 and/or a de-oiler. The main purpose of the pretreatment device is to remove large particles and possibly some substances which are unfavorable to the reaction, such as mineral oil and the like; the filter 11 removes larger hard impurities in water to reduce damage to the membrane, and is usually a metal fine grid with the pore diameter of less than 4mm, and is filtered by multi-media; the oil-water separator removes excessive floating oil in water, and can be any device for realizing oil-water separation, such as an oil separation tank, a vacuum oil filter and the like.
The reaction tank 2 is internally provided with: a mixing unit for efficiently contacting the catalyst with the oxidizing agent and the wastewater; and the control unit is used for controlling any parameters related to reaction conditions, such as temperature, pH, catalyst concentration, liquid level or oxidant concentration, oxidant adding mode and the like in the reaction tank 2. The mixing unit includes a stirring paddle 21; the control unit comprises a liquid level controller 22.
The dosing device 3 comprises an oxidant storage tank and/or a catalyst storage tank and/or a pH regulator storage tank and/or a membrane cleaning agent storage tank. Of course, each reservoir will be fitted with a respective charge pump, if necessary. The water outlet device also comprises a water production pump 42, and the water production pump 42 is connected with the membrane module 41. The water producing pump 42 generates negative pressure by controlling the water producing mode of the pump and the water producing and pausing modes, and pumps out the produced water from the central pipe of the membrane module 41. The membrane module 41 is located in the reaction tank 2, and the water production pump 42 is connected in the downstream direction of the membrane module 41. The water outlet apparatus further comprises a membrane backwash unit comprising a membrane backwash pump 43, a membrane backwash fan 44 and a membrane scouring fan 45. A membrane backwashing pump 43 and a membrane backwashing fan 44 are connected with the membrane component 41, and the backwashing direction is opposite to the water outlet direction of the reaction system; the membrane backwashing pump 43 and the membrane backwashing fan 44 remove catalyst particles on the surface of the membrane module 41 by means of staged water and/or gas backwashing, and clean the membrane module 41; strictly speaking, the water flow and air flow direction are on the back side of the membrane, namely the side opposite to the side where the catalyst is trapped; the membrane scouring fan 45 is connected to the side of the membrane module 41 that traps catalyst. The membrane scouring fan 45 scours the surface of the membrane module 41, reducing the enrichment and stacking of catalyst particles on the surface of the membrane module 41.
The catalyst particles are 200 meshes, and the specific type of the catalyst is HACO-p of Shanghai Qintai environmental science and technology Limited company; the membrane module 41 adopts a PVDF hollow fiber membrane, the filtration pore diameter is 0.04 μm, and the PVDF hollow fiber membrane is used as a filtration system of the catalyst to realize the separation of the catalyst and the wastewater.
The water production pump 42 pumps water in a self-sucking pump mode, the water production pump 42 is linked with the membrane backwashing pump 43, and the membrane backwashing pump 43 performs backwashing for 1 minute every 15 minutes of water production. The membrane scouring fan 45 is kept normally open, the membrane component 41 is pneumatically shaken to reduce catalyst particles from being accumulated on the surface of the membrane, the catalyst is mixed in a mechanical stirring mode, the dosing device 3 mainly adds hydrogen peroxide medicament, the water inlet device 1 adopts a centrifugal pump, and the filter 11 adopts a basket filter; the specific results are shown in table 1 and fig. 2.
TABLE 1
| Catalyst addition concentration (mg/L) | 5000 |
| Kind of waste water | Dye raw water |
| Average influent COD concentration (mg/L) | 24730 |
| Hydrogen peroxide adding concentration (mg/L) | 15000 |
| pH of influent | 5.5 |
| HRT(h) | 6.0 |
| Reaction temperature (. degree.C.) | 25 |
| Average effluent COD concentration (mg/L) | 13080 |
In example 1, different membranes are selected for the separation process, the choice of the backwashing unit is also different, and the backwashing and scouring fans are usually adopted to simultaneously work for the immersed polymer mesoporous fiber membrane. The concentration of the catalyst in water can be influenced after the independent back flush or flushing fan continuously operates, the concentration of the catalyst is higher, the corresponding reaction time is shorter, the effect is better, and therefore the reduction of the concentration of the catalyst can potentially influence the treatment effect of wastewater, and the method is as follows:
however, for the external catalyst filtration recovery as in example 3, the catalyst generally needs to be recovered only by water backwashing and gas backwashing, and the influence of gas scouring is small.
Example 2
An advanced oxidation reaction system for wastewater treatment, as shown in fig. 3, comprising: a water inlet device 1 for introducing wastewater into the reaction system; the reaction tank 2 is used for carrying out oxidation reaction, and a catalyst for the oxidation reaction is filled in the reaction tank 2; a chemical adding device 3 for adding a reagent required by the reaction into the reaction tank 2, wherein the reagent comprises an oxidizing agent; and the water outlet device is used for guiding the treated wastewater out of the reaction system, and comprises at least one set of membrane module 41 for separating the catalyst from the wastewater.
The water inlet device 1 adopts water pumps with different forms and different materials according to different water qualities; the reaction tank can be a reactor in any form, the properties are not strictly limited, and materials in different forms can be selected according to different water qualities, so that the reactor can be used for a long time.
A pretreatment device is arranged in front of the reaction tank 2 and used for removing particles in the wastewater; the pre-treatment means comprise a filter 11 and/or a de-oiler. The main purpose of the pretreatment device is to remove large particles and possibly some substances which are unfavorable to the reaction, such as mineral oil and the like; the filter 11 removes larger hard impurities in water to reduce damage to the membrane, and is usually a metal fine grid with the pore diameter of less than 4mm, and is filtered by multi-media; the oil-water separator removes excessive floating oil in water, and can be any device for realizing oil-water separation, such as an oil separation tank, a vacuum oil filter and the like.
The reaction tank 2 is internally provided with: a mixing unit for efficiently contacting the catalyst with the oxidizing agent and the wastewater; and the control unit is used for controlling any parameters related to reaction conditions, such as temperature, pH, catalyst concentration, liquid level or oxidant concentration, oxidant adding mode and the like in the reaction tank 2. The mixing unit includes a stirring paddle 21; the control unit comprises a liquid level controller 22.
The dosing device 3 comprises an oxidant storage tank and/or a catalyst storage tank and/or a pH regulator storage tank and/or a membrane cleaning agent storage tank. Of course, each reservoir will be fitted with a respective charge pump, if necessary. The water outlet device also comprises a water production pump 42, and the water production pump 42 is connected with the membrane module 41. The water producing pump 42 generates negative pressure by controlling the water producing mode of the pump and the water producing and pausing modes, and pumps out the produced water from the central pipe of the membrane module 41. The membrane module 41 is located in the reaction tank 2, and the water production pump 42 is connected in the downstream direction of the membrane module 41. The water outlet device also comprises a membrane backwashing unit which comprises a membrane backwashing pump 43 and a membrane backwashing fan 44. A membrane backwashing pump 43 and a membrane backwashing fan 44 are connected with the membrane component 41, and the backwashing direction is opposite to the water outlet direction of the reaction system; the membrane backwashing pump 43 and the membrane backwashing fan 44 remove catalyst particles on the surface of the membrane module 41 by means of staged water and/or gas backwashing, and clean the membrane module 41; strictly speaking, the water and air flow direction is on the back side of the membrane, i.e. the side opposite to the side where the catalyst is trapped.
The catalyst particles are 200 meshes, and the specific type of the catalyst is HACO-p of Shanghai Qintai environmental science and technology Limited company; the membrane module 41 adopts a metal membrane, the filtering aperture is 5.0 μm, and the membrane module is used as a filtering system of the catalyst to realize the separation of the catalyst and the wastewater.
The water production pump 42 pumps water in a self-sucking pump mode, the water production pump 42 is linked with the membrane backwashing pump 43, and the membrane backwashing pump 43 performs backwashing for 5 minutes every 30 minutes of water production. Mixing the catalyst by a mechanical stirring mode, wherein a chemical agent of hydrogen peroxide is mainly added into the chemical agent adding device 3, the water inlet device 1 adopts a centrifugal pump, and the filter 11 adopts a basket filter; the specific results are shown in table 2 and fig. 4.
TABLE 2
| Catalyst addition concentration (mg/L) | 5000 |
| Kind of waste water | Crotonaldehyde waste water |
| Average influent COD concentration (mg/L) | 63600 |
| Hydrogen peroxide adding concentration (mg/L) | 45000 |
| pH of influent | 3.5 |
| HRT(h) | 4.0 |
| Reaction temperature (. degree.C.) | 25 |
| Average effluent COD concentration (mg/L) | 29600 |
Example 3
An advanced oxidation reaction system for wastewater treatment, as shown in fig. 5, comprising: a water inlet device 1 for introducing wastewater into the reaction system; the reaction tank 2 is used for carrying out oxidation reaction, and a catalyst for the oxidation reaction is filled in the reaction tank 2; a chemical adding device 3 for adding a reagent required by the reaction into the reaction tank 2, wherein the reagent comprises an oxidizing agent; and the water outlet device is used for guiding the treated wastewater out of the reaction system, and comprises at least one set of membrane module 41 for separating the catalyst from the wastewater.
The water inlet device 1 adopts water pumps with different forms and different materials according to different water qualities; the reaction tank can be a reactor in any form, the properties are not strictly limited, and materials in different forms can be selected according to different water qualities, so that the reactor can be used for a long time.
A pretreatment device is arranged in front of the reaction tank 2 and used for removing particles in the wastewater; the pretreatment device comprises an oil-water separator. The main purpose of the pretreatment device is to remove some substances which are unfavorable to the reaction, such as mineral oil and the like; the oil-water separator removes excessive floating oil in water, and can be any device for realizing oil-water separation, such as an oil separation tank, a vacuum oil filter and the like.
The reaction tank 2 is internally provided with: a mixing unit for efficiently contacting the catalyst with the oxidizing agent and the wastewater; and the control unit is used for controlling any parameters related to reaction conditions, such as temperature, pH, catalyst concentration, liquid level or oxidant concentration, oxidant adding mode and the like in the reaction tank 2. The mixing unit comprises a stirring paddle 21 and an aeration disc 23, and the aeration disc 23 is connected with an aeration fan; the control unit includes a pH controller 24 and a level controller 22.
The dosing device 3 comprises an oxidant storage tank and a pH regulator storage tank and/or a catalyst storage tank and/or a membrane cleaning agent storage tank. Of course, if necessary, each storage tank is matched with a corresponding charging pump; and the pH regulator storage tank can be linked with the pH control unit to further accurately regulate the pH in the reaction tank 2.
The water outlet device also comprises a water production pump 42, and the water production pump 42 is connected with the membrane module 41. The water producing pump 42 generates negative pressure by controlling the water producing mode of the pump and the water producing and pausing modes, and pumps out the produced water from the central pipe of the membrane module 41. The membrane module 41 is located outside the reaction tank 2, and the water producing pump 42 is connected to the upstream direction of the membrane module 41. The water outlet apparatus further comprises a membrane backwash unit comprising a membrane backwash pump 43 and a membrane backwash fan 44. A membrane backwashing pump 43 and a membrane backwashing fan 44 are connected with the membrane component 41, and the backwashing direction is opposite to the water outlet direction of the reaction system; the membrane backwashing pump 43 and the membrane backwashing fan 44 remove catalyst particles on the surface of the membrane module 41 by means of staged water and/or gas backwashing, and clean the membrane module 41; strictly speaking, the water and air flow direction is on the back side of the membrane, i.e. the side opposite to the side where the catalyst is trapped.
The catalyst particles are 200 meshes, and the specific type of the catalyst is HACO-p of Shanghai Qintai environmental science and technology Limited company; the membrane module 41 adopts a metal membrane, the filtering aperture is 5 μm, and the membrane module is used as a filtering system of the catalyst to realize the separation of the catalyst and the wastewater.
The water production pump 42 provides external pressure, water flow is filtered by the membrane, partial catalyst is remained on the membrane, the catalyst returns to the reactor through interval water backwashing and gas backwashing, the water production pump 42 is linked with the membrane backwashing pump 43, and the membrane backwashing pump 43 performs backwashing for 2 minutes every 10 minutes of water production. Mixing the catalyst by a mechanical stirring mode and an aeration stirring mode, wherein the dosing device 3 is mainly added with a hydrogen peroxide medicament, the pH value is controlled to be 4-4.5 on line by a pH controller 24, the water inlet device 1 adopts a peristaltic pump, and no filter exists because no particulate matter exists in the water; the specific results are shown in Table 3.
TABLE 3
As shown in the time axes of FIGS. 2 and 4, the catalyst still maintained the COD removal efficiency close to the initial stage after reacting for 1 month or more, indicating that the treatment effect of the present invention is stable.
Example 4
On the basis of embodiment 2 device, in order to carry out the analysis to the content of catalyst, this embodiment contrast adopts the metal membrane to filter back flush (the utility model discloses) and the catalyst that mode (prior art) recovery that the gravity subsides of adoption stood to according to same waste water concentration, the mode that the oxidant input amount etc. was tested, the time that the gravity subsides is 10min, two sets of other reaction condition homogeneous phase of reaction are the same, handle the meticulous chemical industry waste water of aniline class, it is 5000mg/L to add catalyst powder, the input amount 10000mg/L of hydrogen peroxide solution, and the concentration of dry measurement catalyst after reacting 5 periods, concrete result is as shown in table 4:
TABLE 4
From the comparison, it can be seen that, since the catalyst is powder, the catalyst can be better retained in water by membrane filtration, the reaction conditions before and after the catalyst can be kept consistent, and the catalyst can be settled by standing by gravity, but the particles are too small, and part of the catalyst powder still runs off along with the effluent due to the buoyancy, so that the concentration of the catalyst is reduced along with the reaction, and the reaction effect is influenced.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (10)
1. An advanced oxidation reaction system for wastewater treatment, comprising:
a water inlet device (1) for introducing wastewater into the reaction system;
the reaction tank (2) is used for carrying out oxidation reaction, and a catalyst for the oxidation reaction is filled in the reaction tank (2);
the dosing device (3) is used for adding reagents required by the reaction into the reaction tank (2), and the reagents comprise oxidizing agents;
the water outlet device is used for leading the treated wastewater out of the reaction system, and comprises at least one set of membrane module (41) used for separating the catalyst from the wastewater.
2. The advanced oxidation reaction system for wastewater treatment as set forth in claim 1, wherein a pretreatment device for removing particulate matters in wastewater is further provided in front of the reaction tank (2); the pretreatment device comprises a filter (11) and/or an oil-water separator.
3. An advanced oxidation reaction system for wastewater treatment as set forth in claim 1, wherein said reaction tank (2) is provided with:
a mixing unit for efficiently contacting the catalyst with the oxidizing agent and the wastewater;
and/or a control unit for controlling the temperature, pH, catalyst concentration, liquid level or oxidant concentration within the reaction cell (2).
4. An advanced oxidation reaction system for wastewater treatment according to claim 3, wherein said mixing unit comprises a paddle (21) and/or an aeration tray (23);
the control unit comprises a pH controller (24) and/or a liquid level controller (22).
5. An advanced oxidation reaction system for wastewater treatment as set forth in claim 1, wherein said dosing device (3) comprises an oxidant tank and/or a catalyst tank and/or a pH adjuster tank and/or a membrane cleaning agent tank.
6. An advanced oxidation reaction system for wastewater treatment as set forth in claim 1, wherein said water outlet means further comprises a water producing pump (42), said water producing pump (42) being connected to said membrane module (41).
7. An advanced oxidation reaction system for wastewater treatment according to claim 6, wherein said membrane module (41) is located in the reaction tank (2), and said water-producing pump (42) is connected in a downstream direction of the membrane module (41).
8. An advanced oxidation reaction system for wastewater treatment as set forth in claim 6, wherein said membrane module (41) is located outside said reaction tank (2), and said water-producing pump (42) is connected in the upstream direction of said membrane module (41).
9. An advanced oxidation reaction system for wastewater treatment as set forth in claim 1, wherein said effluent device further comprises a membrane backwash unit comprising a membrane backwash pump (43) and/or a membrane backwash fan (44) and/or a membrane scouring fan (45).
10. The advanced oxidation reaction system for wastewater treatment as claimed in claim 9, wherein the membrane backwashing pump (43) and/or the membrane backwashing fan (44) are connected with the membrane module (41), and the backwashing direction is opposite to the water outlet direction of the reaction system;
the membrane scouring fan (45) is connected with one surface of the membrane component (41) for intercepting the catalyst.
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| CN202121282647.XU CN215049321U (en) | 2021-06-09 | 2021-06-09 | Advanced oxidation reaction system for wastewater treatment |
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| CN202121282647.XU CN215049321U (en) | 2021-06-09 | 2021-06-09 | Advanced oxidation reaction system for wastewater treatment |
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