Three-stage coupled oxidation device

Abstract

The application provides a three-stage coupling oxidation device, which comprises a shell, a micro-electrolysis zone, a Fenton zone and an ultraviolet zone arranged in sequence are arranged in the shell, and a water inlet, a hydrogen peroxide feeding port and a water outlet are arranged on the shell at the micro-electrolysis zone, the Fenton zone and the ultraviolet zone respectively; the micro-electrolysis zone and the Fenton zone are communicated through a porous flow guide plate, the Fenton zone and the ultraviolet zone are separated by a partition plate, the top of the partition plate is lower than the top of the three-stage coupling oxidation device, the micro-electrolysis zone is provided with a lifting filler basket and micro-electrolysis fillers arranged in the filler basket, and the ultraviolet zone is provided with ultraviolet lamp tubes. The filler basket in the micro-electrolysis zone can lift the micro-electrolysis fillers arranged in the filler basket above the liquid level of wastewater, so that the influence of wastewater on the micro-electrolysis fillers can be avoided when the pH value is high.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, and in particular to a three-stage coupled oxidation device. Background Technology

[0002] With the rapid development of the dye industry, the discharge of dye wastewater is increasing day by day, and the resulting environmental pollution problems are becoming increasingly serious. Dye wastewater is characterized by large volume, high content of organic pollutants, complex composition, large variation in water quality, high alkalinity, and difficulty and high cost in treatment.

[0003] In traditional water treatment processes, micro-electrolysis, Fenton oxidation, and ultraviolet oxidation are usually independent devices, requiring transfer tanks or pumps between them. This results in low utilization rates of oxidants (such as H2O2) and Fe... 2+ The system suffers from leakage and incomplete degradation of pollutants; in addition, the split design increases the amount of reagents to be added and the operation and maintenance costs, and also has the problems of large footprint, complex pipelines, high energy consumption and low collaborative efficiency.

[0004] To address this, technicians combined micro-electrolysis, Fenton oxidation, and ultraviolet oxidation into an integrated device. However, due to the large fluctuation range of the wastewater's pH value and the inability to standardize its concentration, different pH values ​​affected the lifespan of the micro-electrolysis raw materials, thus reducing the overall lifespan of the device. Summary of the Invention

[0005] The purpose of this application is to provide a three-stage coupled oxidation device, which forms a micro-electrolysis zone, a Fenton zone and an ultraviolet zone within a housing. A packing basket is provided in the micro-electrolysis zone, in which micro-electrolysis packing is placed and can rise and fall with it, above the wastewater surface, to avoid the impact on the lifespan of the micro-electrolysis packing when the pH value is high.

[0006] To achieve one of the aforementioned objectives, one embodiment of this application provides a three-stage coupled oxidation device, comprising a housing, wherein a micro-electrolysis zone, a Fenton zone, and an ultraviolet zone are arranged sequentially within the housing. The housing is provided with an inlet, a hydrogen peroxide feed port, and an outlet for the micro-electrolysis zone, the Fenton zone, and the ultraviolet zone, respectively. The micro-electrolysis zone and the Fenton zone are connected by a porous guide plate, and the Fenton zone and the ultraviolet zone are separated by a partition. The top of the partition is lower than the top of the three-stage coupled oxidation device. The micro-electrolysis zone is provided with a liftable packing basket and micro-electrolysis packing material disposed within the packing basket. The ultraviolet zone is provided with an ultraviolet lamp.

[0007] As a further improvement of one embodiment of this application, a driving mechanism is also provided on the outer side of the outer shell. The driving mechanism is connected to the packing basket and drives the packing basket to rise and fall.

[0008] As a further improvement of one embodiment of this application, the particle size of the micro-electrolysis filler is 20~30mm, and the filler basket is provided with a plurality of holes, the pore size of which is 10~12mm.

[0009] As a further improvement of one embodiment of this application, the porous guide plate has a pore diameter of 5~10mm and an opening ratio of more than 65%.

[0010] As a further improvement of one embodiment of this application, the micro-electrolysis filler is an iron-carbon ball, wherein the iron:carbon ratio in the iron-carbon ball is (7~7.5):(3~3.5).

[0011] As a further improvement of one embodiment of this application, a stirrer is also included, which extends below the liquid surface in the Fenton zone to perform stirring.

[0012] As a further improvement of one embodiment of this application, the bottom of the ultraviolet region is provided with two inclined plates, which are arranged opposite each other and extend downward from both sides toward the center.

[0013] As a further improvement of one embodiment of this application, the water inlet is located at the bottom of the micro-electrolysis zone, and a water distributor is provided at the bottom of the micro-electrolysis zone so that the wastewater to be treated enters the micro-electrolysis zone upward.

[0014] As a further improvement of one embodiment of this application, the outer shell is also provided with an acid inlet, which is located in the micro-electrolysis zone.

[0015] As a further improvement of one embodiment of this application, the height of the water outlet is lower than the top of the partition.

[0016] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0017] The three-stage coupled oxidation device provided in this application forms a micro-electrolysis zone, a Fenton zone, and an ultraviolet zone within a housing. Wastewater flows through the micro-electrolysis zone, the Fenton zone, and the ultraviolet zone in sequence. The packing basket in the micro-electrolysis zone can raise the micro-electrolysis packing material installed inside to above the wastewater surface, thus avoiding the impact of wastewater on the micro-electrolysis packing material when the pH value is high. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the three-stage coupled oxidation device in the embodiments of this application.

[0019] Figure 2 yes Figure 1 A schematic diagram of the structure of a medium ultraviolet lamp.

[0020] 10. Micro-electrolysis region; 20. Fenton region; 30. Ultraviolet region;

[0021] 1. Outer shell; 11. Inlet; 12. Hydrogen peroxide feed port; 13. Outlet; 14. Acid inlet; 2. Porous guide plate; 3. Baffle plate; 4. Packing basket; 41. Micro-electrolysis packing; 42. Hydraulic press; 5. Ultraviolet lamp; 51. Ultraviolet lamp; 52. Sleeve; 6. Agitator; 7. Inclined plate; 8. Water distributor. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0023] The terms used in this document, such as “center,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” indicating spatial relative positions, are used for illustrative purposes to describe the relationship of one unit or feature relative to another unit or feature as shown in the accompanying drawings. The terms “spatial relative positions” may be intended to include different orientations of the equipment in use or operation other than those shown in the figures.

[0024] For example, if the device in the figure is flipped, a unit described as being "below" or "under" other units or features will be "above" other units or features. Therefore, the exemplary term "below" can encompass both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or otherwise), and the spatially related descriptive terms used herein will be interpreted accordingly.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] Furthermore, it should be understood that although the terms "first," "second," etc., may be used herein to describe various elements or structures, the objects described should not be limited by these terms. These terms are only used to distinguish these objects from one another. For example, a first wireless communication device may be referred to as a second wireless communication device, and similarly, a second wireless communication device may be referred to as a first wireless communication device, without departing from the scope of protection of this application.

[0027] This application provides a three-stage coupled oxidation device, such as... Figure 1 As shown, the device includes an outer shell 1, inside which are arranged a micro-electrolysis zone 10, a Fenton zone 20, and an ultraviolet zone 30. The outer shell 1 is provided with an inlet 11, a hydrogen peroxide feed port 12, and an outlet 13 in the micro-electrolysis zone 10, the Fenton zone 20, and the ultraviolet zone 30, respectively. The micro-electrolysis zone 10 and the Fenton zone 20 are connected by a porous guide plate 2, and the Fenton zone 20 and the ultraviolet zone 30 are separated by a partition 3. The top of the partition 3 is lower than the top of the three-stage coupled oxidation device. The micro-electrolysis zone 10 is provided with a liftable packing basket 4 and micro-electrolysis packing 41 disposed in the packing basket 4. The ultraviolet zone 30 is provided with an ultraviolet lamp tube 5.

[0028] The three-stage coupled oxidation device provided in this application forms a micro-electrolysis zone 10, a Fenton zone 20, and an ultraviolet zone 30 within a housing 1. Wastewater flows sequentially through the micro-electrolysis zone 10, the Fenton zone 20, and the ultraviolet zone 30. Fe is provided by electrolysis in the micro-electrolysis packing 41 of the micro-electrolysis zone 10. 2+ Fe 2+ The H2O2 added through the hydrogen peroxide (H2O2) feed port initiates the Fenton reaction in the Fenton zone 20, generating ·OH free radicals, and some Fe that does not have time to react... 2+ H2O2 flows into the ultraviolet region 30 from the top of the separator 3, and the Fenton conversion is enhanced under the action of ultraviolet light, thus preventing Fe from being absorbed. 2+ H2O2 is lost from outlet 13, and iron sludge can be separated by precipitation in the ultraviolet zone 30.

[0029] The three coupled oxidation devices provided in this application are interconnected and housed within a single housing 1, eliminating the need for intermediate water tanks or pumps between zones, as well as complex piping connections, thus avoiding Fe... 2+ It addresses issues such as leakage and incomplete degradation of pollutants, and the synergistic effect of these three factors improves treatment efficiency.

[0030] When the wastewater is non-strongly acidic (pH≥5) and the concentration is low, the Fenton zone 20 and the ultraviolet zone 30 can treat the wastewater. The packing basket 4 is raised above the wastewater surface, so that the three-stage coupled oxidation device is called a two-stage coupled oxidation device. This prevents the effect of the micro-electrolysis packing 41 from being affected when pH≥5 and extends the life of the micro-electrolysis packing 41.

[0031] In one embodiment of this application, the outer casing 1 is further provided with an acid inlet 14, which is located in the micro-electrolysis zone 10.

[0032] When the wastewater is not strongly acidic (pH≥5) but has a high concentration, the pH value of the wastewater can be adjusted by adding acid port 14 to meet the conditions for the Fenton reaction to occur.

[0033] Furthermore, a drive mechanism is also provided on the outside of the outer shell 1. The drive mechanism is connected to the packing basket 4 and drives the packing basket 4 to rise and fall.

[0034] like Figure 1 In the middle, the driving mechanism is a hydraulic press 42, which is located on the top of the outer shell 1 in the micro-electrolysis zone 10 and is connected to the packing basket 4 by a rope, so that the packing basket 4 can be raised and lowered.

[0035] In one embodiment of this application, the particle size of the micro-electrolysis filler 41 is 20-30 mm, and the filler basket 4 is provided with a plurality of holes, the pore diameter of which is 10-12 mm. The pore diameter of the filler basket 4 is set to be smaller than the particle size of the micro-electrolysis filler 41 to prevent the micro-electrolysis filler 41 from falling through the holes of the filler basket 4 to the bottom of the filler basket 4.

[0036] Furthermore, the perimeter of the packing basket 4 is fitted to the inner wall of the micro-electrolysis zone 10 to prevent the micro-electrolysis packing 41 from falling off the edge of the packing basket 4.

[0037] Furthermore, the porous guide plate 2 has a pore diameter of 5~10mm and an open area ratio of more than 65%. The pore diameter of the porous guide plate 2 is also smaller than the particle size of the micro-electrolysis filler 41 to prevent the micro-electrolysis filler 41 from entering the Fenton zone 20 and causing it to be lost.

[0038] In one embodiment of this application, the micro-electrolysis filler 41 is an iron-carbon ball, wherein the iron:carbon ratio in the iron-carbon ball is (7~7.5):(3~3.5). Iron, carbon, and wastewater form a galvanic cell, producing Fe. 2+ As the wastewater passes through the porous guide plate 2 and enters the Fenton zone 20, hydrogen peroxide (H2O2) is added through the hydrogen peroxide feed port 12. 2+ It reacts with H2O2 in the Fenton zone 20 to produce ·OH free radicals, which are used to decompose organic matter in wastewater.

[0039] In one embodiment of this application, the three-stage coupled oxidation device further includes a stirrer 6, which extends below the liquid surface in the Fenton zone 20 to stir the mixture, so that H2O2 reacts with Fe. 2+ Fully contact and reaction.

[0040] In one embodiment of this application, two inclined plates 7 are provided at the bottom of the ultraviolet region 30. The two inclined plates 7 are arranged opposite each other and extend downward from both sides toward the middle.

[0041] The precipitate settles onto the inclined plate 7 at a higher position, then slides down the inclined plate 7 and finally concentrates at the bottom of the ultraviolet region 30. The inclined plate 7 allows the precipitate to settle in advance, thus improving the precipitation efficiency.

[0042] Furthermore, the height of the outlet 13 is slightly lower than the top of the baffle 3 to prevent wastewater in the ultraviolet zone 30 from flowing back into the Fenton zone 20.

[0043] The ultraviolet lamp tube 5 includes an ultraviolet lamp 51 and a transparent sleeve 52 that is fitted over the ultraviolet lamp 51 to prevent scale buildup on the ultraviolet lamp 51 and to facilitate cleaning, thereby extending the lifespan of the ultraviolet lamp 51.

[0044] In one embodiment of this application, the water inlet 11 is located at the bottom of the micro-electrolysis zone 10, and a water distributor 8 is provided at the bottom of the micro-electrolysis zone 10 so that the wastewater to be treated enters the micro-electrolysis zone 10 upwards.

[0045] The three-stage coupled oxidation device provided in this application embodiment generates Fe through micro-electrolysis in the micro-electrolysis zone 10 when the wastewater is strongly acidic. 2+ The H2O2 added in Fenton zone 20 undergoes a Fenton reaction, degrading organic matter. When the wastewater is non-strongly acidic (pH≥5) and has a low concentration, the packing basket 4 is raised above the liquid surface, and the wastewater can be treated by passing through Fenton zone 20 and ultraviolet zone 30 alone. When the wastewater is non-strongly acidic (pH≥5) but has a high concentration, the pH value of the wastewater is adjusted through acid addition port 14 to meet the conditions for the Fenton reaction, and then the wastewater is cleaned by micro-electrolysis, Fenton reaction, and sedimentation.

[0046] In summary, the three-stage coupled oxidation device provided in this application can be flexibly adjusted according to the pH value and concentration of the wastewater, without causing short lifespan of the micro-electrolysis packing 41 or Fe... 2+ It suffers from problems such as leakage and incomplete degradation of pollutants, and its structure is simple.

[0047] The following are examples of wastewater treatment using the three-stage coupled oxidation device provided in this application:

[0048] Wastewater flows from the distributor 8 at the bottom of the micro-electrolysis zone 10 into the iron-carbon balls in the packing basket 4 of the micro-electrolysis zone 10 at a flow rate of 5 m³ / h. The Fe:C ratio is 7:3 and the wavelength of the ultraviolet lamp is 254 nm.

[0049] The wastewater has a pH < 5 and a residence time of 30 min in the micro-electrolysis zone 10. After passing through the porous guide plate 2, it enters the Fenton zone 20, where it stays for 30 min before entering the ultraviolet zone 30. After a residence time of 20 min, it flows out from the outlet 13. The table below shows the pollutants and their concentrations when the wastewater enters the three-stage coupled oxidation device and exits the device.

[0050]

[0051] It should be noted that the residence time in the embodiment does not mean that the wastewater stops entering the three-stage coupled oxidation device. The wastewater is continuously flowing, but it takes time for the wastewater to fill each zone. Therefore, the wastewater flow rate depends on the required residence time and the volume in each zone.

[0052] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0053] The detailed descriptions listed above are merely specific descriptions of feasible implementation methods of this application and are not intended to limit the scope of protection of this application. All equivalent implementation methods or modifications made without departing from the spirit of the art of this application should be included within the scope of protection of this application.

Claims

1. A three-stage coupled oxidation device, characterized in that, The device includes an outer casing, within which are arranged sequentially a micro-electrolysis zone, a Fenton zone, and a UV zone. The outer casing has an inlet, a hydrogen peroxide feed port, and an outlet for each of the micro-electrolysis zone, Fenton zone, and UV zone, respectively. The micro-electrolysis zone and the Fenton zone are connected by a porous guide plate, and the Fenton zone and the UV zone are separated by a partition. The top of the partition is lower than the top of the three-stage coupled oxidation device. The micro-electrolysis zone is equipped with a liftable packing basket and micro-electrolysis packing material within the basket. The UV zone is equipped with a UV lamp.

2. The three-stage coupled oxidation apparatus according to claim 1, characterized in that, A drive mechanism is also provided on the outside of the outer shell. The drive mechanism is connected to the packing basket and drives the packing basket to rise and fall.

3. The three-stage coupled oxidation apparatus according to claim 1, characterized in that, The micro-electrolysis filler has a particle size of 20-30 mm, and the filler basket is provided with a number of holes with a pore size of 10-12 mm.

4. The three-stage coupled oxidation apparatus according to claim 3, characterized in that, The porous guide plate has a pore diameter of 5~10mm and an opening ratio of more than 65%.

5. The three-stage coupled oxidation apparatus according to claim 1, characterized in that, The micro-electrolysis filler is an iron-carbon ball, wherein the iron:carbon ratio in the iron-carbon ball is (7~7.5):(3~3.5).

6. The three-stage coupled oxidation apparatus according to claim 1, characterized in that, It also includes a stirrer that extends below the liquid surface in the Fenton zone to stir the liquid.

7. The three-stage coupled oxidation apparatus according to claim 1, characterized in that, The bottom of the ultraviolet region is provided with two inclined plates, which are arranged opposite each other and extend downwards from both sides toward the middle.

8. The three-stage coupled oxidation apparatus according to claim 1, characterized in that, The inlet is located at the bottom of the micro-electrolysis zone, and a water distributor is provided at the bottom of the micro-electrolysis zone to allow the wastewater to be treated to enter the micro-electrolysis zone upwards.

9. The three-stage coupled oxidation apparatus according to claim 1, characterized in that, The outer shell is also provided with an acid inlet, which is located in the micro-electrolysis zone.

10. The three-stage coupled oxidation apparatus according to claim 1, characterized in that, The height of the water outlet is lower than the top of the partition.

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