Mixing device for Fenton fluidized tower

Abstract

The utility model relates to a mixing device for a Fenton fluidized tower, which comprises a barrel, two water inlets and two guide plates, the first water inlet is positioned at the upper part of the barrel, hydrogen peroxide and sewage form a first mixed solution, and the first mixed solution flows into the barrel from the first water inlet; the ferrous ion solution and the sewage form a second mixed solution, and the second mixed solution flows into the cylinder from the second water inlet; the connecting surface of the first guide plate and the side wall of the barrel is positioned on one side of the first water inlet; the connecting surface of the second guide plate and the side wall of the barrel is positioned on one side of the second water inlet; a water inlet channel is reserved between the first flow guide plate and the second flow guide plate; the first mixed solution and the second mixed solution form vortex in the central area; according to the utility model, hydrogen peroxide and a ferrous ion solution are respectively mixed with sewage, so that the hydrogen peroxide and the ferrous ion solution can be more fully dispersed in the sewage before entering a reaction area. Therefore, more uniform mixing can be realized, and the Fenton reaction can be carried out more comprehensively and efficiently.

Description

TECHNICAL FIELD

[0001] The utility model relates to the wastewater treatment technical field in the environmental engineering technical field, concretely relates to a kind of mixing device for fenton fluidized tower. BACKGROUND

[0002] Fenton oxidation method is a kind of efficient and economic wastewater advanced oxidation technology, is currently widely used in coking, pharmaceutical chemical industry, printing and dyeing and papermaking industry wastewater, and its main principle is in H 2+ Reaction produces strong oxidizing hydroxyl radical, and the oxidation potential of hydroxyl radical is as high as 2.73V.In nature, the oxidation capacity in solution is only second to fluorine gas.Therefore, persistent organic matter, especially the aromatic compounds and some heterocyclic compounds which are usually difficult to oxidize reagent, are all selectively oxidized and degraded in front of fenton reagent.

[0003] Fenton oxidation does not have selectivity, and does not need additional reaction conditions, and can be carried out at normal temperature and pressure, is a kind of multi-reaction, easy to trigger high-efficiency reagent, and because of this, fenton has many problems in practical application, such as low utilization rate of hydrogen peroxide and Fe 2+ The traditional way is to add drug mixing through multi-cell series concrete water tank, and H + , ferrous sulfate and hydrogen peroxide are added into it in turn, and reaction conditions are provided by hydraulic or mechanical mixing, which causes the disadvantages of large amount of reagent consumption, high operation cost and the like.

[0004] Application publication number: CN 108439571A, application date: May 24, 2018, and the invention name is a fenton fluidized bed for sewage treatment and its method, the invention discloses a fenton fluidized bed for sewage treatment and a method for treating sewage, and the fenton fluidized bed comprises a vertically arranged fluidized bed cylinder, and a reaction zone, a Fe and Mn fluidized bed zone, a buffer zone, a crystal interception separator, a clarification zone and an overflow zone are sequentially arranged in the fluidized bed cylinder from bottom to top, and a support frame is arranged at the bottom of the Fe and Mn fluidized bed zone and the crystal interception separator, and the fenton fluidized bed further comprises a water inlet pipe, a water outlet pipe, an exhaust pipe, an emptying pipe valve, a hydrogen peroxide pipe, a ferrous sulfate pipe and a circulating device.The fenton fluidized bed removes the last organic matter difficult to be biodegraded in wastewater by the multi-phase internal circulation of fenton fluidized bed and the fenton oxidation effect of fluidized bed, after the anaerobic and aerobic treatment of the sedimentation tank effluent.

[0005] In the prior art, hydrogen peroxide and ferrous sulfate enter the Fenton fluidized bed through pipelines and react with sewage. Since the sewage is not fully mixed before the reaction, some organic matter in the sewage cannot fully contact with hydroxyl radicals, resulting in low organic matter removal efficiency and difficult-to-meet water quality standards. Some hydrogen peroxide decomposes or escapes without participating in the reaction, causing waste of hydrogen peroxide and increasing treatment cost. If ferrous sulfate cannot be uniformly dispersed in the sewage, it may precipitate in local areas due to high concentration, affecting its catalytic effect and causing waste of reagents. In addition, the precipitated ferrous sulfate may accumulate at the bottom of the equipment, increasing the difficulty of equipment cleaning and maintenance.

[0006] In addition, after hydrogen peroxide and ferrous sulfate are mixed, a Fenton reaction occurs rapidly, generating a large amount of hydroxyl radicals with strong oxidizing properties. Due to the extremely fast reaction rate, a large amount of heat is released in a short time, which can easily cause the solution temperature to rise sharply, and even local overheating may occur, posing a certain safety hazard. Practical new type content

[0007] In view of the above-mentioned prior art that hydrogen peroxide and ferrous sulfate are simultaneously mixed and flowed into the Fenton fluidized bed, since the reaction is too concentrated, a part of hydrogen peroxide decomposes invalidly without having time to fully react with ferrous ions to generate hydroxyl radicals, reducing the utilization rate of hydrogen peroxide and ferrous sulfate. The purpose of the present application is to provide a mixing device for a Fenton fluidized tower.

[0008] The technical scheme provided by the present application is as follows:

[0009] A mixing device for a Fenton fluidized tower, comprising a cylinder body sealed by a top cover and a bottom cover at the top and the bottom, respectively;

[0010] Further comprising: a first water inlet, the first water inlet is located at the upper part of the cylinder body, the first water inlet can introduce a first mixed liquid formed by hydrogen peroxide and sewage into the inside of the cylinder body;

[0011] A second water inlet, the second water inlet is located at the same horizontal plane as the first water inlet, the second water inlet can introduce a second mixed liquid formed by ferrous ion solution and sewage into the inside of the cylinder body;

[0012] A first flow guide plate, the first flow guide plate is vertically arranged in the cylinder body, the top of the first flow guide plate is fixedly connected with the top cover of the cylinder body, the connecting surface between the first flow guide plate and the side wall of the cylinder body is located at one side of the first water inlet, and the first flow guide plate is used for guiding the first mixed liquid;

[0013] A second flow guide plate is vertically arranged in the cylinder, the top of the second flow guide plate is fixedly connected with the top cover of the cylinder, the connecting surface of the second flow guide plate with the side wall of the cylinder is located at the side of the second water inlet, and the second flow guide plate is used for guiding the second mixed liquid.

[0014] The first flow guide plate and the second flow guide plate are centrally symmetrical, and a water inlet channel is left between the first flow guide plate and the second flow guide plate.

[0015] The first mixed liquid and the second mixed liquid enter the central area surrounded by the first flow guide plate and the second flow guide plate through the water inlet channel, and the first mixed liquid and the second mixed liquid form a vortex in the central area.

[0016] The first water inlet is located outside the first flow guide plate, the second water inlet is located outside the second flow guide plate, and the first water inlet and the second water inlet are separated by the first flow guide plate and the second flow guide plate.

[0017] Further, the first flow guide plate comprises a first curved surface and a first streamline part, and the first curved surface and the first streamline part are connected through a first arc part; the first curved surface protrudes towards the side wall of the cylinder.

[0018] The first curved surface is relatively far away from the first water inlet, and the first streamline part is relatively close to the first water inlet; one end of the first streamline part is fixedly connected with the side wall of the cylinder.

[0019] The second flow guide plate comprises a second curved surface and a second streamline part, and the second curved surface and the second streamline part are connected through a second arc part; the second curved surface protrudes towards the side wall of the cylinder.

[0020] The second curved surface is relatively far away from the second water inlet, and the second streamline part is relatively close to the second water inlet; one end of the second streamline part is fixedly connected with the side wall of the cylinder.

[0021] The end of the first curved surface is opposite to the second streamline part, and a gap is left between the end of the first curved surface and the second streamline part, and the gap forms a water inlet channel.

[0022] The end of the second curved surface is opposite to the first streamline part, and a gap is left between the end of the second curved surface and the first streamline part, and the gap forms another water inlet channel.

[0023] The end of the first curved surface is one end of the first curved surface away from the first arc part. The end of the second curved surface is one end of the second curved surface away from the second arc part.

[0024] Further, the cylinder is a circular cylinder, and with respect to a cross section perpendicular to the central axis of the circular cylinder, the intersection point of the radius of the circular cylinder and the side surface of the circular cylinder is denoted as A, the intersection point of the radius of the circular cylinder and the first curved surface is denoted as B, and the tangent line at A is substantially parallel to the tangent line at B.

[0025] Further, the vertical distance between the first curved end and the second streamline part is 110mm-130mm.

[0026] Further, the line connecting the first curved end and the second curved end passes through the center axis of the cylinder.

[0027] Further, the first curved surface and the first arc-shaped part are curved in opposite directions, and the first streamline part has a straight cross section.

[0028] Further, the mixing device further comprises a turbulence part, a first porous plate is arranged between the first guide plate and the second guide plate at the top of the turbulence part, the first porous plate uniformly distributes a plurality of through holes with consistent sizes, and the porous plate is used for uniformly distributing water.

[0029] Further, the turbulence part comprises a plurality of layers of turbulence plates, each layer of turbulence plate comprises a first turbulence corrugated plate and a second turbulence corrugated plate, the first turbulence corrugated plate and the second turbulence corrugated plate are arranged in a cross manner, and both ends of the first turbulence corrugated plate and the second turbulence corrugated plate are connected with the side wall of the cylinder.

[0030] The lower part of the first turbulence corrugated plate is a continuous first wavy corrugated plate.

[0031] The lower part of the second turbulence corrugated plate is a continuous second wavy corrugated plate.

[0032] The first wavy corrugated plate and the second wavy corrugated plate are interlaced with each other.

[0033] Further, each layer of the turbulence plate comprises a plurality of groups of embedded parts, and the embedded part is composed of the first turbulence corrugated plate and the adjacent second turbulence corrugated plate.

[0034] In each group of the embedded part, the first wavy corrugated plate and the second wavy corrugated plate are respectively close to the middle part of the embedded part.

[0035] The first wavy corrugated plate and the second wavy corrugated plate leave a gap for water flow.

[0036] The first wavy corrugated plate and the second wavy corrugated plate are approximately in the shape of a positive V.

[0037] Further, the adjacent two layers of the turbulence plates are perpendicular to each other, and a gap is left between the adjacent two layers of the turbulence plates.

[0038] Further, a second porous plate is arranged between the bottom of the turbulence part and the bottom cover of the cylinder, and the second porous plate has the same structure as the first porous plate.

[0039] Further, the lower part of the barrel is uniformly distributed with a plurality of water distributors along the circumference of the barrel, the water distributors are located on the outer wall of the barrel, and the connecting surface of the water distributor and the barrel is located below the second porous plate.

[0040] Compared with the prior art, the technical scheme has the following beneficial effects:

[0041] (1) The hydrogen peroxide and ferrous ion solution are mixed with sewage respectively, which can make them more fully dispersed in the sewage before entering the reaction area. This helps to achieve more uniform mixing on a microscopic scale, avoids the situation of local high or low concentration, and makes the Fenton reaction more comprehensive and efficient.

[0042] (2) When the hydrogen peroxide and ferrous ion solution are mixed with sewage respectively, the flow rate and flow of hydrogen peroxide and ferrous ion solution entering the sewage can be adjusted to control the start and speed of the reaction.

[0043] (3) Separate addition of hydrogen peroxide and ferrous ion solution can reduce the invalid decomposition of hydrogen peroxide. When hydrogen peroxide and ferrous ion solution are added at the same time, hydrogen peroxide may be prematurely decomposed in local areas due to too concentrated reaction, producing oxygen and water, rather than effectively generating hydroxyl radicals for oxidation of pollutants in sewage. When added separately, hydrogen peroxide can be more evenly distributed in the sewage and gradually react with ferrous ions to improve the efficiency of hydrogen peroxide generating hydroxyl radicals.

[0044] (4) The turbulence plate cuts, disperses and mixes with each other through a special structure to achieve good mixing effect. In addition, the presence of the turbulence plate can reduce the deposition of dirt. When the water flow is laminar, impurities in the water are easy to deposit on the solid surface such as pipe wall to form scale or other dirt. After the turbulence plate makes the water flow turbulent, it is more difficult for impurities in the water to stay on the wall. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 It is a three-dimensional schematic view of the overall structure of the mixing device in an embodiment of the application;

[0046] Figure 2 It is a top view of the mixing device in an embodiment of the application;

[0047] Figure 3 It is a sectional view of the mixing device in an embodiment of the application;

[0048] Figure 4 It is a schematic view of the turbulence plate structure in an embodiment of the application;

[0049] Figure 5 It is a center-symmetrical schematic view of the first and second guide plates in an embodiment of the application;

[0050] Figure 6 Structure diagram of first guide plate and second guide plate in one embodiment of the application;

[0051] Figure 7 Structure diagram of turbulence plate in one embodiment of the application;

[0052] Figure 8 Top view of turbulence plate in one embodiment of the application;

[0053] Figure 9 Distribution diagram of adjacent turbulence plates in one embodiment of the application;

[0054] Figure 10 Structure diagram of first porous plate in one embodiment of the application;

[0055] Explanation of the reference numerals in the schematic diagram:

[0056] First water inlet 1;

[0057] Second water inlet 2;

[0058] First guide plate 3, first curved surface 31, first streamline part 32, first arc-shaped part 33;

[0059] Second guide plate 4, second curved surface 41, second streamline part 42, second arc-shaped part 43;

[0060] Central region 5;

[0061] First porous plate 6;

[0062] First turbulence corrugated plate 71, first wavy corrugation 711, first vertical plate 712;

[0063] Second turbulence corrugated plate 72, second wavy corrugation 721, second vertical plate 722;

[0064] Second porous plate 8;

[0065] Water distributor 9, connecting pipe 91, water distributor body 92;

[0066] Cylinder 10. DETAILED DESCRIPTION

[0067] In order to further understand the content of the application, the application will be described in detail in combination with the drawings and embodiments.

[0068] The structure, proportion, size and the like shown in the drawings of the specification are only used to cooperate with the content disclosed in the specification, to be understood and read by those skilled in the art, and do not define the limiting conditions for the implementation of the utility model, so they do not have substantial technical significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the functions and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and the like used in the specification are only for the convenience of clear description, and are not used to limit the scope of implementation. The change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the scope of implementation of the utility model.

[0069] Fenton reaction uses ferrous ion Fe 2+ as a catalyst, and hydrogen peroxide H2O2 reacts with Fe 2+ under acidic conditions to generate hydroxyl radicals with strong oxidizing properties, while Fe 2+ is oxidized to Fe 3+ , and the reaction equation is H 2 O 2 + Fe 2+ → ·OH + OH — + Fe 3+ .

[0070] The generated Fe 3+ can continue to react with H2O2, Fe 3+ + H2O2→ Fe 2+ + HO2· + H + , and the generated HO2· can continue to react with Fe 2+ to generate ·OH (hydroxyl radical), and the cycle continues, constantly generating hydroxyl radicals.

[0071] Chemical oxygen demand (COD) refers to the amount of oxidizing agent consumed when a water sample is treated with a strong oxidizing agent under certain conditions, expressed in milligrams of oxygen per liter (mg / L), which reflects the degree of pollution of water by reducing substances. COD value is an important indicator of the amount of organic matter in water. The higher the COD value, the more reducing substances in the water, mainly the higher the content of organic matter, the more serious the organic pollution of the water body.

[0072] SS refers to the content of suspended solids in water, which is another important indicator in water quality detection. High SS concentration can make the water turbid, reduce transparency, and affect the sensory properties of water. Suspended solids hinder light penetration, affecting photosynthesis of aquatic plants, changing the living environment of aquatic organisms, leading to suffocation and death of aquatic organisms such as fish, and disrupting the ecological balance of water bodies. Suspended solids adsorb pollutants such as heavy metals, pesticides, and nutrients such as phosphorus, which are released into water under certain conditions, causing secondary pollution. Suspended solids adhere to the inner wall of the pipeline, increasing fouling and blockage, affecting sewage flow and treatment effect, increasing water treatment cost, and reducing disinfection effect and drinking water safety.

[0073] In Fenton reaction, hydrogen peroxide (H2O2) produces hydroxyl radicals (·OH) with strong oxidizing properties under the catalysis of ferrous ions (Fe 2+ ). Hydroxyl radicals (·OH) can rapidly oxidize organic matter in water without selectivity, breaking down complex organic pollutants into small molecular organic matter, such as oxidizing large molecular aromatic compounds into carboxylic acid, alcohol, aldehyde, etc., or even mineralizing into carbon dioxide and water, thereby reducing the COD value in water.

[0074] Through Fenton reaction, some organic matter that is difficult to biodegrade is converted into small molecular substances that are easy to biodegrade, improving the biodegradability of wastewater. This is conducive to further removal of organic matter by subsequent biological treatment process, thereby more effectively reducing COD.

[0075] Meanwhile, hydroxyl radicals (·OH) can oxidize and decompose part of the organic matter combined or adsorbed with SS, reducing the content of organic matter on the surface of SS, thereby reducing the stability of SS and making it easier to precipitate and separate from water. On the other hand, the iron hydroxide colloid generated during Fenton reaction has flocculation effect, which can adsorb SS in water to form larger flocs and precipitate to the bottom of the water, thereby achieving the purpose of removing SS. For colloidal SS in water, the iron hydroxide colloid generated by Fenton reaction can cause colloidal SS to coagulate by electric neutralization, adsorption bridging, etc., forming larger particles, and then precipitating and removing.

[0076] A mixing device for Fenton fluidized tower according to the present application comprises a cylinder 10 sealed by a top cover and a bottom cover at the top and bottom respectively, and two water inlets, wherein the first water inlet 1 is located at the upper part of the cylinder 10, and the first mixed liquid formed by hydrogen peroxide and sewage flows into the inside of the cylinder 10 through the first water inlet 1; the second water inlet 2 is located at the same horizontal plane as the first water inlet 1, and the second mixed liquid formed by ferrous ion solution and sewage flows into the inside of the cylinder 10 through the second water inlet 2.

[0077] It is worth mentioning that the sewage is first pumped up, and then sulfuric acid is added in the sewage pipe to control the pH value of the sewage to about 3-4, and the pH detector is used to detect the pH value after adding sulfuric acid for real-time control. The end of the sewage pipe is connected to the first branch pipe and the second branch pipe, part of the sewage flows into the first branch pipe, and the remaining part of the sewage flows into the second branch pipe; hydrogen peroxide (H2O2) is added to the first branch pipe, and the hydrogen peroxide (H2O2) is fully mixed with the sewage to form a first mixed liquid; ferrous ion (Fe 2+ ) solution is added to the second branch pipe, and the ferrous ion (Fe 2+ ) solution is fully mixed with the sewage to form a second mixed liquid. Flow meters are provided in the first branch pipe and the second branch pipe for accurate control of the amount of reagent added.

[0078] The first flow guide plate 3 is used for guiding the first mixed liquid, and the first flow guide plate 3 is vertically arranged in the cylinder 10, the top of the first flow guide plate 3 is fixedly connected with the top cover of the cylinder 10, and the connecting surface between the first flow guide plate 3 and the side wall of the cylinder 10 is located on one side of the first water inlet 1. This design can timely guide the first mixed liquid.

[0079] The second flow guide plate 4 is designed to be centrally symmetric with the first flow guide plate 3, and the second flow guide plate 4 is used for guiding the second mixed liquid, which is located in the same horizontal plane as the first flow guide plate 3. Similarly, the second flow guide plate 4 is vertically arranged in the cylinder 10, the top of the second flow guide plate 4 is fixedly connected with the top cover of the cylinder 10, and the connecting surface between the second flow guide plate 4 and the side wall of the cylinder 10 is located on one side of the second water inlet 2.

[0080] The first water inlet 1 is located outside the first flow guide plate 3, and the second water inlet 2 is located outside the second flow guide plate 4, that is, the first water inlet 1 and the second water inlet 2 are separated by the first flow guide plate 3 and the second flow guide plate 4.

[0081] The first flow guide plate 3 and the second flow guide plate 4 leave a water inlet channel between them, and they enclose a central area 5, the first mixed liquid and the second mixed liquid enter the central area 5 from the water inlet channel. Since the first mixed liquid and the second mixed liquid have a certain flow rate, generally 2 m / s, in the central area 5, the first mixed liquid and the second mixed liquid will form a vortex.

[0082] Mixing hydrogen peroxide and ferrous ion solution with sewage respectively can make them more fully dispersed in the sewage before entering the reaction area. This helps to achieve more uniform mixing at the microscopic scale, avoiding local high or low concentration, so that the Fenton reaction can be more comprehensive and efficient.

[0083] If hydrogen peroxide and ferrous ions are mixed together before entering the sewage, premature reaction may occur in the pipeline or mixing equipment, generating iron hydroxide precipitate. This precipitate may clog the pipeline or cover the catalyst surface, affecting the normal progress of the reaction. By using separate mixing, the possibility of premature reaction can be reduced, ensuring the effective use of reagents in the sewage.

[0084] When treating sewage of different water quality and quantity, separate mixing facilitates real-time adjustment of the dosing amount of hydrogen peroxide and ferrous ions according to the actual situation. The addition amount of the two reagents can be flexibly controlled according to the concentration and type of organic matter in the sewage and the real-time monitoring of the reaction effect, achieving more optimized reagent dosing control and reducing reagent cost.

[0085] Hydrogen peroxide will decompose to produce hydroxyl radicals under the catalysis of ferrous ions, but if hydrogen peroxide decomposes excessively in a high concentration of ferrous ion environment, it may cause the reaction to be too violent, generating a large amount of heat and gas, which poses a certain safety risk. By mixing them separately with the sewage, hydrogen peroxide can be mixed with the sewage in a relatively mild environment, reducing the risk of uncontrolled decomposition.

[0086] If ferrous ions are present in excess in the treated sewage, it may cause the color of the effluent to increase, affecting the water quality of the effluent. By separate mixing, the dosing amount of ferrous ions can be more accurately controlled, making the ratio of ferrous ions to hydrogen peroxide more appropriate and reducing the possibility of excessive residual ferrous ions.

[0087] More specifically, the cylinder 10 is preferably a cylinder, the first flow guide plate 3 includes a first curved surface 31, a first streamline portion 32, and a first arc-shaped portion 33, wherein the first arc-shaped portion 33 is used to connect the first curved surface 31 and the first streamline portion 32, and the first curved surface 31 protrudes towards the side wall of the cylinder 10.

[0088] The first curved surface 31 is relatively far from the first water inlet 1, and the first streamline portion 32 is relatively close to the first water inlet 1, and one end of the first streamline portion 32 is fixedly connected with the side wall of the cylinder 10. The first curved surface 31 and the first arc-shaped portion 33 are preferably reversely curved, and the cross section of the first streamline portion 32 is a straight line, where the cross section refers to the cross section perpendicular to the central axis of the cylinder 10.

[0089] Similarly, the second flow guide plate 4 includes a second curved surface 41, a second streamline portion 42, and a second arc-shaped portion 43, wherein the second arc-shaped portion 43 is used to connect the second curved surface 41 and the second streamline portion 42, and the second curved surface 41 protrudes towards the side wall of the cylinder 10. The second curved surface 41 is relatively far from the second water inlet 2, and the second streamline portion 42 is relatively close to the second water inlet 2, and one end of the second streamline portion 42 is fixedly connected with the side wall of the cylinder 10.

[0090] The end of the first curved surface 31 is opposite to the second streamlined part 42, and a gap is left between the two, which is the water inlet channel, more specifically, the water inlet channel for the first mixed liquid to enter the central area 5. The end of the second curved surface 41 is opposite to the first streamlined part 32, and a gap is left between the two, which forms another water inlet channel for the second mixed liquid to enter the central area 5, and the first mixed liquid and the second mixed liquid are fully mixed in the central area 5.

[0091] It is worth noting that the end of the first curved surface 31 is the end of the first curved surface 31 away from the first arc part 33, and the end of the second curved surface 41 is the end of the second curved surface 41 away from the second arc part 43. The vertical distance between the end of the first curved surface 31 and the second streamlined part 42 is 110mm-130mm, and the line connecting the end of the first curved surface 31 and the end of the second curved surface 41 passes through the center axis of the cylinder 10. The height of the first flow guide plate 3 and the second flow guide plate 4 is 130mm-160mm.

[0092] More specifically, since the cylinder 10 is preferably a cylinder, with respect to a cross section perpendicular to the center axis of the cylinder 10, the intersection of the cylinder radius and the cylinder side is marked as A, the intersection of the cylinder radius and the first curved surface 31 is marked as B, and the tangent line at A is approximately parallel to the tangent line at B. In this way, the first mixed liquid can be more smoothly guided. Similarly, the second curved surface 41 also adopts the same design principle.

[0093] The mixing device also includes a turbulent part, and a first perforated plate 6 is arranged between the first flow guide plate 3 and the second flow guide plate 4 at the top of the turbulent part. The first perforated plate 6 uniformly distributes a plurality of through holes of the same size, and the first perforated plate 6 is used for uniform water distribution. A gap is left between the first flow guide plate 3, the second flow guide plate 4 and the first perforated plate 6, and a gap is also left between the first perforated plate 6 and the turbulent part.

[0094] The turbulent part includes a plurality of layers of turbulent plates, each layer of turbulent plate includes a first turbulent corrugated plate 71 and a second turbulent corrugated plate 72, which are arranged in a spaced manner, and the two ends of the first turbulent corrugated plate 71 and the second turbulent corrugated plate 72 are connected with the side wall of the cylinder 10. Each layer of turbulent plate includes a plurality of groups of embedded parts 70, and the embedded part 70 is composed of the first turbulent corrugated plate 71 and the adjacent second turbulent corrugated plate 72.

[0095] The lower part of the first turbulent corrugated plate 71 is a continuous first wavy corrugation 711, and the lower part of the second turbulent corrugated plate 72 is a continuous second wavy corrugation 721. The first wavy corrugation 711 and the second wavy corrugation 721 are staggered with each other and arranged in a staggered manner.

[0096] In each set of the fitting parts 70, the first wavy corrugations 711 and the second wavy corrugations 721 are each close to the middle of the fitting part 70, and a gap is left between the first wavy corrugations 711 and the second wavy corrugations 721 for water flow, and the first wavy corrugations 711 and the second wavy corrugations 721 are approximately in a positive V shape.

[0097] The upper part of the first turbulence corrugated plate 71 is a first vertical plate 712, and the upper part of the second turbulence corrugated plate 72 is a second vertical plate 722. The first vertical plate 712 and the second vertical plate 722 of the same layer are parallel to each other, and the first vertical plate 712 is preferably integrally formed with the first wavy corrugations 711, and the second vertical plate 722 is preferably integrally formed with the second wavy corrugations 721.

[0098] The turbulence plate can effectively disturb the laminar flow state that may exist. When the water flow passes through a smooth wall surface, it is easy to form a laminar flow, and the corrugated structure of the turbulence plate changes the flow direction of the water flow. When the water flow passes through the turbulence plate, it is forced to flow along the ups and downs of the corrugations, thereby converting the laminar flow into turbulent flow.

[0099] The turbulence plate cuts, disperses and mixes the fluid through a special structure, achieving good mixing effect. In addition, the existence of the turbulence plate can reduce the deposition of dirt. When the water flow is laminar, impurities in the water are easy to deposit on the solid surface such as the pipe wall, forming scale or other dirt. After the water flow is changed into turbulent flow by the turbulence plate, it is more difficult for impurities in the water to stay on the wall surface.

[0100] It is worth noting that the turbulence plates of the upper and lower adjacent two layers are perpendicular to each other, and a certain gap is left. The clear distance of the upper and lower two layers of turbulence plates ranges from 55mm to 75mm. Such a design can fully mix the fluid, fully contact the ferrous ion solution and hydrogen peroxide, and greatly improve the utilization rate of the medicament.

[0101] A second porous plate 8 is arranged between the bottom of the turbulence part and the bottom cover of the cylinder 10, and the second porous plate 8 has the same structural features as the first porous plate 6. The second porous plate 8 is also used for uniform water distribution.

[0102] A plurality of water distributors 9 are uniformly distributed along the circumference of the cylinder 10 at the lower part of the cylinder 10. The water distributor 9 is located on the outer wall of the cylinder 10, and the connecting surface of the water distributor 9 and the cylinder 10 is located below the second porous plate 8.

[0103] More specifically, the water distributor 9 includes a connecting pipe 91 penetrating through the side wall of the cylinder 10 and a water distributor body 92 located above the connecting pipe 91 and fixedly connected thereto. The connecting pipe 91 is preferably L-shaped, and the water distributor body 92 is preferably a cylinder with a radius greater than that of the connecting pipe 91. The side surface of the water distributor body 92 is uniformly provided with a plurality of through holes for jet flow.

[0104] The mixing device of the application is arranged in the Fenton fluidized tower and is located at the bottom of the fluidized Fenton tower, the tower body of the Fenton fluidized tower is generally a cylindrical structure made of corrosion-resistant material to bear chemical corrosion and certain pressure in the reaction process. For example, the tower body can be made of stainless steel or glass fiber reinforced plastic material to ensure long-term stable operation in the acidic or alkaline wastewater environment. After the hydrogen peroxide, ferrous ion solution and wastewater are fully mixed, the mixture rises along the lower part of the tower to the upper part in a fluidized state until the water weir discharges from the water outlet at the upper part of the fluidized Fenton tower and then is discharged from the fluidized Fenton tower. At this time, the discharged water needs to be subjected to subsequent alkali adjustment, aeration and other steps to adjust the pH value and decompose excess hydrogen peroxide, and then is subjected to the inclined tube sedimentation tank for sedimentation.

[0105] The above description of the application and its embodiments is illustrative, and is not limiting, and the embodiments shown in the drawings are only one of the embodiments of the application, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by the application, without departing from the creative purpose of the application, similar structural modes and embodiments can be designed without creativity, which should belong to the protection scope of the application.

Claims

1. A mixing device for Fenton fluidized tower, comprising a cylinder (10) sealed by a top cover and a bottom cover at top and bottom respectively; characterized in that Further comprising, a first water inlet (1) located at the upper part of the cylinder (10), which can introduce a first mixture of hydrogen peroxide and sewage into the cylinder (10); a second water inlet (2) located at the same horizontal plane as the first water inlet (1), which can introduce a second mixture of ferrous ion solution and sewage into the cylinder (10); a first baffle (3) vertically arranged in the cylinder (10), the top of which is fixedly connected with the top cover of the cylinder (10), and the connecting surface of the first baffle (3) with the side wall of the cylinder (10) is located at one side of the first water inlet (1), which is used for guiding the first mixture; a second baffle (4) vertically arranged in the cylinder (10), the top of which is fixedly connected with the top cover of the cylinder (10), and the connecting surface of the second baffle (4) with the side wall of the cylinder (10) is located at one side of the second water inlet (2), which is used for guiding the second mixture; a central region (5) surrounded by the first baffle (3) and the second baffle (4), in which the first mixture and the second mixture form a vortex; wherein the first baffle (3) and the second baffle (4) are centrally symmetric, and an inlet channel is left between them; the first water inlet (1) is located outside the first baffle (3), the second water inlet (2) is located outside the second baffle (4), and the first water inlet (1) and the second water inlet (2) are separated by the first baffle (3) and the second baffle (4). 2.The mixing device for Fenton fluidized tower according to claim 1, wherein: the first baffle (3) comprises a first curved surface (31) and a first streamline part (32), and the first curved surface (31) and the first streamline part (32) are connected by a first arc-shaped part (33); the first curved surface (31) protrudes towards the side wall of the cylinder (10); wherein the first curved surface (31) is relatively far away from the first water inlet (1), and the first streamline part (32) is relatively close to the first water inlet (1); one end of the first streamline part (32) is fixedly connected with the side wall of the cylinder (10); the second baffle (4) comprises a second curved surface (41) and a second streamline part (42), and the second curved surface (41) and the second streamline part (42) are connected by a second arc-shaped part (43); the second curved surface (41) protrudes towards the side wall of the cylinder (10); wherein the second curved surface (41) is relatively far away from the second water inlet (2), and the second streamline part (42) is relatively close to the second water inlet (2); one end of the second streamline part (42) is fixedly connected with the side wall of the cylinder (10). The end of the first curved surface (31) is opposite to the second streamline part (42), and a gap is left between the two, which forms a water inlet channel; The end of the second curved surface (41) is opposite to the first streamline part (32), and a gap is left between the two, which forms another water inlet channel; The end of the first curved surface (31) is the end of the first curved surface (31) away from the first arc-shaped part (33). The end of the second curved surface (41) is the end of the second curved surface (41) away from the second arc-shaped part (43).

3. A mixing device for a Fenton fluidized column according to claim 2, characterized in that: The cylinder body (10) is a cylinder. With respect to a cross section perpendicular to the central axis of the cylinder, the intersection point of the radius of the cylinder and the side surface of the cylinder is denoted as A, and the intersection point of the radius of the cylinder and the first curved surface (31) is denoted as B. The tangent line at A is substantially parallel to the tangent line at B.

4. A mixing device for a Fenton fluidized column according to claim 3, characterized in that: The vertical distance between the end of the first curved surface (31) and the second streamline part (42) is 110mm-130mm.

5. A mixing device for a Fenton fluidized column according to claim 2, characterized in that: The line connecting the end of the first curved surface (31) and the end of the second curved surface (41) passes through the central axis of the cylinder body (10).

6. A mixing device for a Fenton fluidized column according to claim 3, characterized in that: The bending directions of the first curved surface (31) and the first arc-shaped part (33) are opposite, and the cross section of the first streamline part (32) is a straight line.

7. A mixing device for a Fenton fluidized column according to claim 1, characterized in that: The mixing device further comprises a turbulent flow part, and a first porous plate (6) is arranged between the first flow guide plate (3) and the second flow guide plate (4) at the top of the turbulent flow part. The first porous plate (6) uniformly distributes a plurality of through holes with consistent sizes, and the porous plate (6) is used for uniformly distributing water.

8. A mixing device for a Fenton fluidized column according to claim 7, characterized in that: The turbulent flow part comprises a plurality of layers of turbulent flow plates. Each layer of the turbulent flow plates comprises a first turbulence corrugated plate (71) and a second turbulence corrugated plate (72). The first turbulence corrugated plate (71) and the second turbulence corrugated plate (72) are arranged at intervals. The two ends of the first turbulence corrugated plate (71) and the second turbulence corrugated plate (72) are connected with the side wall of the cylinder body (10). The lower part of the first turbulence corrugated plate (71) is a continuous first wave-shaped corrugation (711). The lower part of the second turbulence corrugated plate (72) is a continuous second wave-shaped corrugation (721). The first wave-shaped corrugation (711) and the second wave-shaped corrugation (721) are interlaced with each other.

9. A mixing device for a Fenton fluidized column according to claim 8, characterized in that: Each layer of the turbulent flow plates comprises a plurality of groups of embedded parts (70), and the embedded parts (70) are composed of the first turbulence corrugated plate (71) and the adjacent second turbulence corrugated plate (72). In each group of the embedded parts (70), the first wave-shaped corrugation (711) and the second wave-shaped corrugation (721) respectively approach the middle part of the embedded part (70). A gap is left between the first wave-shaped corrugation (711) and the second wave-shaped corrugation (721) for water flow. The first wave-shaped corrugation (711) and the second wave-shaped corrugation (721) are substantially in the shape of a positive V.

10. A mixing device for a Fenton fluidized column according to claim 8, characterized in that: The adjacent two layers of the turbulent flow plates are perpendicular to each other, and a gap is left between the adjacent two layers of the turbulent flow plates.

11. A mixing device for a Fenton fluidized column according to claim 7, characterized in that: A second porous plate (8) is arranged between the bottom of the turbulent flow part and the bottom cover of the cylinder body (10). The second porous plate (8) has the same structure as the first porous plate (6).

12. A mixing device for a Fenton fluidized column according to claim 10, characterized in that: The lower part of the barrel (10) is uniformly distributed with several water distributors (9) along the circumference of the barrel (10), the water distributors (9) are located on the outer wall of the barrel (10), and the connecting surface of the water distributors (9) and the barrel (10) is located below the second porous plate (8).

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