Integrated advanced oxidation reaction device for landfill leachate

Abstract

The utility model relates to an integrated landfill leachate advanced oxidation reaction device which comprises a device body, and the device body is sequentially provided with an ozone reaction zone, a photocatalytic reaction zone, an atomization zone and a gas-liquid separation zone from bottom to top; the ozone reaction area is connected with an ozone gas source, the photocatalytic reaction area is provided with more than two layers of ultraviolet lamp tubes which are arranged in an array manner, the atomization area is provided with an atomization nozzle, and the gas-liquid separation area is provided with a gas-liquid separator; a water outlet pipe is arranged at the bottom of the device body and connected with a circulating pipe and a drainage pipe through a tee joint; the circulating pipe is connected with the atomizing nozzle and is used for circularly conveying sewage at the bottom of the device body to the atomizing nozzle above the ultraviolet lamp tube, so that the sewage is sprayed out in a micro-droplet manner; the circulating pipe is further connected with the water inlet pipe. According to the utility model, the COD (Chemical Oxygen Demand) value of the landfill leachate concentrated solution can be effectively reduced, and a good water inlet condition is provided for a subsequent evaporation crystallizer.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sewage treatment technical field, concretely relates to integrated garbage leachate advanced oxidation reaction device. BACKGROUND

[0002] A large amount of leachate is produced in the process of collecting, transporting, filling and incinerating household garbage, which will cause serious pollution to the environment if not treated. The pollution components of the garbage leachate are very complex, mainly including ammonia nitrogen, various dissolved cations, heavy metals, phenols, soluble fatty acids and other organic pollutants. The COD of the leachate can be as high as 70,000 mg / L or more, and the minimum is nearly 40,000 mg / L, and it contains a large amount of humic acid. It is difficult to treat it to below the secondary or even primary standard by using the traditional biochemical treatment process. Generally speaking, the COD in the leachate is nearly 500-1000 mg / L, which cannot be treated by biological treatment. The ammonia nitrogen concentration of the garbage leachate is very high, generally about 1500-2500 mg / L. In addition, due to the lack of classification of household garbage, it contains a lot of industrial waste, so the content of heavy metals and salt is high.

[0003] The main process of current garbage leachate treatment is: pretreatment + anaerobic + external membrane bioreactor (MBR) + nanofiltration (NF) + reverse osmosis (RO). Among them, the nanofiltration unit and the reverse osmosis unit will produce concentrated liquid accounting for about 15% of the respective water intake; the nanofiltration concentrated liquid contains high concentration of difficult biodegradable organic matter, and its CODcr can be as high as 5000 mg / L, containing a large amount of humic acid, which is very difficult to be biodegraded. Although the organic matter content in the reverse osmosis concentrated liquid is low, it contains very high salt, reaching more than 15 g / L. In addition, the nanofiltration concentrated liquid also contains high concentration of salt, among which the divalent salt ions are mainly calcium, magnesium, barium and sulfate ions, etc.

[0004] The existing technology often uses an evaporator to evaporate the concentrated liquid to produce pure condensed water and crystallized salt. The condensed water is used as recycled water. However, due to the high organic matter content in the concentrated liquid, the heat transfer efficiency may be affected during the evaporation process, resulting in a decrease in evaporation efficiency and easy scaling. Such scaling not only reduces the heat transfer efficiency, but also may cause equipment blockage, which needs to be cleaned and maintained regularly. At the same time, a large amount of volatile organic compounds (VOCs) also have strong corrosiveness in the heating process. In order to solve this problem, the high-COD concentrated liquid must be pretreated for degradation, and improving the degradation efficiency of the oxidation degradation equipment is the key to solving the problem. UTILITY MODEL CONTENTS

[0005] (1) Technical problem to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the integrated landfill leachate advanced oxidation reaction device greatly reduces the COD value of the landfill leachate concentrate, improves the water quality, and provides good water quality conditions for further treatment of the subsequent evaporation crystallizer.

[0007] (II) Technical solutions

[0008] In a first aspect, the utility model provides an integrated landfill leachate advanced oxidation reaction device, which comprises: a device body, the device body is sequentially provided with an ozone reaction zone, a photocatalytic reaction zone, an atomization zone and a gas-liquid separation zone from the bottom upwards, the ozone reaction zone is connected with an ozone gas source, the photocatalytic reaction zone is provided with two or more than two arrayed ultraviolet lamp tubes, the atomization zone is provided with an atomizing nozzle, and the gas-liquid separation zone is provided with a gas-liquid separator; the device body is provided with a water outlet pipe at the bottom, the water outlet pipe is connected with a circulating pipe and a drain pipe through a tee joint; the circulating pipe is connected with the atomizing nozzle and is used for circulating and conveying the sewage at the bottom of the device body to the atomizing nozzle above the ultraviolet lamp tube, so that the sewage is sprayed out in the form of small droplets by the atomizing nozzle; the circulating pipe is also connected with a water inlet pipe; the water inlet pipe is connected with the concentrated solution of landfill leachate; wherein the water droplet particle diameter sprayed by the atomizing nozzle is between 50-2000 microns, and the operating pressure is lower than 0.1 mPa.

[0009] According to the preferred embodiment of the utility model, the circulating pipe comprises a circulating main pipe and a plurality of circulating branch pipes, the circulating main pipe is connected with the circulating branch pipes, the circulating main pipe is arranged outside the device body, and the circulating branch pipes are arranged inside the device body; at least one atomizing nozzle is arranged on each circulating branch pipe.

[0010] According to the preferred embodiment of the utility model, a gas circulating pipe is arranged above the gas-liquid separator at the top of the device body, a gas extraction device is arranged on the gas circulating pipe, and the gas collected at the top of the device body is recycled from the ozone reaction zone of the device body to the inside of the device body by the gas extraction device and the gas circulating pipe. Preferably, the gas circulating pipe is connected with the input pipeline of the ozone gas source, so that the recycled gas is mixed with the ozone gas source and then input into the ozone reaction zone of the device body, the gas circulating pipe can greatly improve the utilization rate of ozone gas molecules and reduce the consumption of ozone. Preferably, the ozone gas source is an ozone generator.

[0011] An exhaust valve is further arranged at the top of the device body, so that the excess gas is discharged in time to maintain a constant pressurized environment inside the device body, and the excess gas is discharged. Preferably, the pressure of the device body is maintained at 0.10 mPa-0.8 mPa.

[0012] According to the preferred embodiment of the utility model, the ultraviolet lamp is connected with the ultraviolet generator; the ultraviolet generator is located outside the device body, and the ultraviolet lamp is located inside the device body; a bracket is arranged along the inner wall of the device body inside the device body, and the ultraviolet lamp is arranged on the bracket.

[0013] Preferably, a plurality of transversely penetrating mounting holes are arranged on the device body, a light-transmitting waterproof sleeve is arranged in the hole, the ultraviolet lamp is directly mounted in the light-transmitting waterproof sleeve, and the light-transmitting waterproof sleeve has an opening end facing the outside of the reaction shell. In this way, the assembly and maintenance of the ultraviolet lamp can be very convenient.

[0014] Preferably, when the ultraviolet lamp is mounted inside the device body through the bracket, the ultraviolet lamp is made of a transparent substrate material doped with an ozone-light composite catalyst, or the surface of the ultraviolet lamp is coated with an ozone-light composite catalyst coating; when the ultraviolet lamp is mounted through the sleeve located inside the device body, the light-transmitting waterproof sleeve is made of a transparent substrate material doped with an ozone-light composite catalyst, or the surface of the light-transmitting waterproof sleeve is coated with an ozone-light composite catalyst coating. The transparent ozone-light composite catalyst does not affect the emission of ultraviolet light while greatly strengthening the degradation of organic molecules in sewage.

[0015] Preferably, the cross section of the ultraviolet lamp is circular, oval, gourd-shaped or droplet-shaped, the equivalent diameter of each ultraviolet lamp is 1-5 cm, the long axis direction of the cross section of the ultraviolet lamp with an oval cross section is arranged along the vertical direction, the ultraviolet lamps are arranged in two layers or more layers and have layer spacing, the single-layer ultraviolet lamps are arranged in parallel and the tube spacing is formed between two ultraviolet lamps, the adjacent two layers of ultraviolet lamps are arranged in a staggered manner, so that one layer of ultraviolet lamps is located in the tube spacing of another layer of ultraviolet lamps, or the adjacent two layers of ultraviolet lamps are arranged in a cross manner, so that one layer of ultraviolet lamps is crossed with another layer of ultraviolet lamps in the spatial position.

[0016] According to the preferred embodiment of the utility model, the gas-liquid separator is composed of a group of inclined installed corrugated plates, the horizontal spacing between adjacent corrugated plates is 1-10 mm, and the corrugated plate is coated with an ozone-light composite catalyst coating (such as TiO2 / MnO2 composite catalyst), and the coating thickness can be 0.1-0.5 mm. The composite catalyst has ozone catalysis and photocatalysis functions. The corrugated plate is made of a hydrophilic material or has hydrophilicity on the surface, so as to improve the gas-liquid separation efficiency.

[0017] According to the preferred embodiment of the utility model, the vertical distance between the uppermost layer of ultraviolet lamps of the ultraviolet reaction zone and the lower edge of the atomizing nozzle above is 15 cm-30 cm; the spacing between two ultraviolet lamps arranged in parallel is 3-10 times the diameter of the ultraviolet lamp; and the layer spacing of two layers of ultraviolet lamps is 1-3 times the diameter of the ultraviolet lamp.

[0018] According to the preferable embodiment of the utility model, the ozone gas source is an ozone generator, the position of the ozone generator connected to the gas inlet of the ozone reaction zone is higher than the sewage liquid level, a conical groove is arranged at the bottom of the device body, the bottom of the conical groove is provided with the water outlet pipe, or the position of the ozone generator connected to the gas inlet of the ozone reaction zone is below the sewage liquid level, the ozone reaction zone is filled with 30-40% volume ratio of transparent porous suspended filler, and the surface of the transparent porous suspended filler is covered with a polyethylene imine coating. The transparent porous suspended filler is made of PMMA, PS (close to the specific gravity of sewage) and the like, for example, a large number of amino groups can be introduced on the surface of the transparent porous suspended filler by immersing the surface in a polyethylene imine film; most of the organic molecules with acidity are anchored on the surface of the suspended spherical filler; the porous structure increases the specific surface area, and a certain proportion (preferably > 30%) of mesopores in the porous structure are particularly suitable for the transmission and residence of ozone molecules, so that the ozone molecules can provide a place for cavitation and oxidation of organic matter.

[0019] According to the preferable embodiment of the utility model, the water inlet pipe of the first advanced oxidation reaction device and the second advanced oxidation reaction device is further connected with a Fenton reagent adding device; a valve is arranged between the Fenton reagent adding device and the water inlet pipe; whether the valve is opened or not is determined according to the COD value of the water in the water inlet pipe, so as to determine whether the Fenton reagent is added to the water.

[0020] According to the preferable embodiment of the utility model, the device body is made of plastic, glass fiber reinforced plastic or carbon fiber reinforced plastic (glass steel), and these materials have good corrosion resistance.

[0021] It should be noted that the ozone reaction zone does not only have ozone oxidation reaction, and the photocatalysis reaction zone does not only have photocatalysis reaction. Ozone catalysis, photocatalysis and even Fenton catalysis can occur simultaneously at any position in the entire reaction tower shell.

[0022] (Three) beneficial effects

[0023] The integrated garbage leachate advanced oxidation reaction device integrates photocatalysis, ozone catalysis, Fenton oxidation degradation and the like, utilizes three kinds of catalytic technologies to cooperate with each other, greatly improves oxidation intensity, reduces COD value in water, improves water quality, provides good water inlet conditions for the evaporation crystallizer.

[0024] The advanced oxidation reaction device can be used in the whole or part according to water quality conditions entering the advanced oxidation reaction device in the use process. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a structure schematic view of the integrated garbage leachate advanced oxidation reaction device.

[0026] Figure 2 It is a side view of the integrated garbage leachate advanced oxidation reaction device.

[0027] Figure 3 It is a layout schematic view of the wastewater inlet pipe and the atomizing nozzle of the integrated garbage leachate advanced oxidation reaction device.

[0028] REFERENCE SIGNS:

[0029] 640 - device body; 6401 - water outlet pipe; 641 - atomizing nozzle; 642 - circulating pump; 643 - tee joint; 6431 - drain pipe; 644 - ozone generator; 645 - gas-liquid separator; 6461 - gas circulating pipe; 646 - air extraction device; 647 - exhaust valve; 648 - ultraviolet generator; 649 - bracket; 6410 - ultraviolet lamp tube. DETAILED DESCRIPTION

[0030] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Contents not described in detail in this specification are existing technologies known to those skilled in the art. In the description of this utility model, it is important to understand that terms such as "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this utility model. Furthermore, terms such as "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] Example 1

[0033] like Figure 1 As shown, the advanced oxidation reaction apparatus of this utility model, according to a preferred embodiment, includes a device body 640. The device body 640, from bottom to top, is provided with an ozone reaction zone, a photocatalytic reaction zone, an atomization zone, and a gas-liquid separation zone. The ozone reaction zone is connected to an ozone generator 644. The photocatalytic reaction zone has two or more layers of ultraviolet lamps 6410 arranged in an array, with the ultraviolet lamps 6410 mounted on a bracket 649. The atomization zone has a plurality of atomizing nozzles 641, which are arranged as follows: Figure 3 The circulating branch pipe shown is located inside the device body 640 and suspended a distance above the ultraviolet lamp tube 6410. The circulating branch pipe connects to the main circulating pipe outside the device body 640. A gas-liquid separator 645 is provided in the gas-liquid separation zone near the top of the device body 640. A water outlet pipe 6401 is located at the bottom of the device body 640. The water outlet pipe 6401 connects to the main circulating pipe and the drain pipe 6431 via a tee 643. The drain pipe 6431 is used to discharge the treated water to the outside of the advanced oxidation reaction device. The water outlet pipe 6401 is connected to a circulating pump 642, which provides the power for water circulation. The circulating pipe 642 circulates the wastewater from the bottom of the device body 640 to the atomizing nozzle 641 above the photocatalytic reaction zone, where the wastewater is sprayed out as tiny droplets, forming several dispersed water droplets. Preferably, the flow rate of the circulating pump 642 is 30 m³ / s. 3h. This circulation flow is related to the design specifications of the entire device body 640. The vertical distance between the uppermost ultraviolet lamp tube 6410 of the ultraviolet reaction zone and the lower edge of the atomizing nozzle 641 above it is 15-30 cm, which constitutes the mixing reaction area of the dispersed phase water droplets and the continuous phase ozone. As shown in Figure 2 The circulating main pipe is also connected to the water inlet pipe of the advanced oxidation reaction device. The water droplet particle diameter sprayed by the atomizing nozzle 641 is between 50-2000 μm, the operating pressure is lower than 0.1 mPa (preferably 0.7 bar), and the flow rate of a single atomizing nozzle 641 is 20 L / min. In the first advanced oxidation reaction device 64, the water inlet pipe is connected to the outlet of the first water pool 63 of the nanofiltration concentrate treatment unit 6; in the second advanced oxidation reaction device 72, the water inlet pipe is connected to the outlet of the third water pool 71 of the reverse osmosis concentrate treatment unit 7. As shown in Figure 3 Three atomizing nozzles are respectively arranged on the two circulating branch pipes, for a total of six atomizing nozzles, so that these atomizing nozzles are evenly distributed on the cross section of the device body 640.

[0034] As shown in Figure 1 and Figure 2 The device body 640 is installed with 6 layers of a total of 33 ultraviolet lamp tubes 6410, the ultraviolet lamp tubes 6410 are installed on the bracket 649 and connected to the ultraviolet generator 648 outside the device body 640. Among them, each layer of the 6 layers of ultraviolet lamp tubes 6410 has a spacing, and the ultraviolet lamp tubes in a single layer also form a spacing; and the adjacent two layers of ultraviolet lamp tubes 6410 are staggered, so that one layer of ultraviolet lamp tubes 6410 is located within the tube spacing of another layer of ultraviolet lamp tubes 6410. In other embodiments, the adjacent two layers of ultraviolet lamp tubes 6410 can also be cross arranged, i.e. one layer of ultraviolet lamp tubes 6410 is cross with another layer of ultraviolet lamp tubes 6410 in spatial position. Among them, the spacing between the two ultraviolet lamp tubes in the same layer is 3-10 times the diameter of the ultraviolet lamp tube, and the layer spacing of the adjacent two layers of ultraviolet lamp tubes is 1-3 ultraviolet lamp tubes. These reasonable spacings can provide a path for rapid diffusion and mass transfer of ozone and atomized water droplets, and also enable the sewage droplets generated by the atomizing nozzle to cover the surface of the ultraviolet lamp tube 6410 to form a liquid film, preventing the sewage droplets from rapidly falling to the bottom of the device body 640.

[0035] Preferably, the surface of the ultraviolet lamp tube is coated with at least one transparent ozone-light composite catalyst coating of TiO2 / ZnO, TiO2 / Ag, TiO2 / graphene. The transparent ozone-light composite catalyst coating can greatly enhance the degradation of organic molecules in wastewater without affecting the emission of ultraviolet light. These catalysts also have ozone catalytic function, so that even in the mode without turning on the ultraviolet light, the ultraviolet lamp tube 6410 can form a biofilm reactor, the atomized liquid droplets generated by the atomizing nozzle 641 fall on the surface of the ultraviolet lamp tube 6410 to form a very thin liquid film, and the continuously charged continuous phase ozone can quickly contact and mass transfer react with the organic matter in the liquid film when contacting the ultraviolet lamp tube 6410, and the transparent ozone-light composite catalyst also plays a catalytic role of ozone at this time. The cross section of the ultraviolet lamp tube 6410 can be circular, elliptical, gourd-shaped or droplet-shaped, and the elliptical shape is preferred. The equivalent diameter of each ultraviolet lamp tube is 1-5 cm; the long axis direction of the cross section of the ultraviolet lamp tube with an elliptical cross section is arranged in the vertical direction. These shapes have a larger specific surface area, and the elliptical and droplet-shaped ultraviolet lamp tubes 6410 can reduce the top surface area and increase the contact area of the liquid film with ozone.

[0036] As shown in Figure 1 The advanced oxidation reaction device also includes a gas circulation system. Specifically, a gas circulation pipe 6461 is arranged at the top of the device body 640 and above the gas-liquid separator 645, and a gas extraction device 646 is arranged on the gas circulation pipe 6461. The gas extraction device 646 and the gas circulation pipe 6461 are used to recycle the gas collected at the top of the device body 640 from the bottom of the device body to the ozone reaction zone of the device body. Preferably, an ozone sensor is arranged on the gas circulation pipe 6461. When a high ozone concentration is sensed, the recycled gas can be directly reused, otherwise new ozone gas generated by the ozone generator 644 is used to supplement. The gas circulation pipe 6461 can be directly connected to the ozone reaction zone of the device body 640, or can be connected to the connecting pipeline between the ozone generator 644 and the device body 640, so that the recycled gas and the newly generated ozone gas are mixed uniformly and then input into the ozone reaction zone of the device body 640. The use of the gas circulation pipe 6461 can greatly improve the utilization rate of ozone molecules and reduce the consumption of ozone. An exhaust valve 647 is also arranged at the top of the device body 640. The exhaust valve 647 can timely discharge excess gas to maintain a constant and safe pressurized environment in the device body 640. The pressure in the device body 640 is maintained at 0.10 mPa-0.8 mPa. At this pressure, the movement speed of ozone molecules in the wastewater droplets or liquid film can be greatly enhanced, the oxidation speed of organic matter can be accelerated, and the COD of the effluent can be reduced.

[0037] The gas-liquid separator 645 is composed of a group of obliquely installed corrugated plates, and the horizontal distance between adjacent corrugated plates is 1-10 mm. The corrugated plates are made of hydrophilic material or have hydrophilic surface, so that when the gas-liquid mixture passes through the gap between adjacent corrugated plates, the water droplets are adsorbed on the surface of the corrugated plates, improving the gas-liquid separation efficiency. The corrugated plates are coated with a TiO2 / MnO2 composite catalyst coating, and the coating thickness can be 0.1-0.5 mm. The composite catalyst has ozone catalysis and photocatalysis functions, so it can catalyze the decomposition of organic matter when the advanced oxidation reaction device is only turned on in part of the oxidation mode. The TiO2 / MnO2 composite catalyst coating can increase the hydrophilicity of the corrugated plates. The distance from the bottom of the gas-liquid separator 645 to the upper surface of the atomizing nozzle 641 is 10 cm, and the distance from the top of the gas-liquid separator 645 to the top of the device body 640 is 25 cm, which can provide a longer distance for the sufficient oxidation of ozone to wastewater, and at the same time, it leaves a gas gathering space, which is conducive to forming a certain positive pressure environment in the device body 640, and enhancing the degree of COD oxidation and degradation.

[0038] The connection pipeline of the ozone generator 644 and the device body 640 is provided with a valve, the valve is provided between the circulation branch pipe and the circulation main pipe, the connection valve is provided between the water inlet and the circulation main pipe, the valve is provided between the drain pipe 6431 and the three-way pipe 643, and the COD online sensor is arranged at the bottom of the device body 640, which is used to detect the degradation of water quality COD. When the degradation is good, the drain pipe 6431 is opened to continuously drain water and the water inlet pipe is continuously fed with water, otherwise the drain pipe 6431 and the water inlet pipe are closed, so that the water in the device body 640 is circulated to strengthen the oxidation and degradation. Further, the water inlet pipe is also connected with a Fenton reagent adding device, whether the valve is opened or not is determined according to the COD value of the water in the water inlet pipe, so as to determine whether the Fenton reagent is added to the water inlet. In application, the device of the utility model can produce various combined modes of synergistic oxidation according to the water quality.

[0039] In the embodiment, the ozone generator 644 is connected to the position of the gas inlet of the ozone reaction zone which is higher than the liquid surface of the wastewater (the liquid surface of the wastewater is lower than the gas inlet of the ozone generator 644), and a conical groove is arranged at the bottom of the device body, and the bottom of the conical groove is provided with the water outlet pipe 6401. The conical groove constitutes a water collecting groove, the upper part of the oxidation device body 640 is a cuboid, and the lower part is a water collecting groove. The total height of the device body 640 is 3.5 m, the length is 1.5 m, the width is 1 m, the height of the water collecting groove is 0.5 m, and the included angle of the bottom of the water collecting groove is 90 degrees. The device body 640 can be made of plastic, glass fiber reinforced plastic, carbon fiber reinforced plastic (glass steel), which has good corrosion resistance; or the device body is made of stainless steel material and coated with anticorrosive coating inside, or is made of reinforced concrete structure and coated with anticorrosive coating inside.

[0040] Embodiment 2

[0041] The difference between this embodiment and embodiment 1 is that the installation mode of the ultraviolet lamp 6410 in the advanced oxidation reaction device in this embodiment is as follows: a plurality of mounting holes are provided on the device body 640, which transversely penetrate the two sides of the device body 640, a sleeve with high light transmittance (such as a PMMA sleeve) is arranged in the hole, and the ultraviolet lamp or lamp strip is directly installed in the light-transmitting waterproof sleeve, and the light-transmitting waterproof sleeve has an open end facing the outside of the reaction shell. The ultraviolet lamp or lamp strip is connected with the ultraviolet generator 648 outside the device body 640. This structure has the advantages of convenient assembly and maintenance of the ultraviolet lamp, and the ultraviolet lamp does not need to use a special waterproof material. At this time, the bracket 649 does not need to be arranged, and the light-transmitting waterproof sleeve is made of a transparent substrate material doped with TiO2 / ZnO, or at least one transparent ozone-light composite catalyst coating of TiO2 / ZnO, TiO2 / Ag, TiO2 / graphene is coated on the surface of the light-transmitting waterproof sleeve. As shown in FIG. 6, 6 layers of sleeves penetrating the two sides of the device body 640 are arranged, and then the ultraviolet lamp strip or lamp is placed in the sleeve, and the power line is connected to the ultraviolet generator 648 outside the device body 640. Figure 2

[0042] Embodiment 3

[0043] The difference between this embodiment and embodiment 1 is that in the advanced oxidation reaction device of this embodiment, the wastewater liquid level of the ozone device body 640 is only about 5-10 cm lower than the ultraviolet lamp 6410, and the ozone generator 644 is connected to the position of the gas inlet of the ozone reaction zone below the wastewater liquid level. At this time, the area below the ultraviolet lamp 6410 constitutes a bubbling ozone reaction zone, which can relatively increase the wastewater inflow and improve the processing speed of the advanced oxidation reaction device compared with the mode of embodiment 1. In order to strengthen the degradation efficiency of wastewater COD, a transparent suspended spherical filler occupying about 30-40% of the volume of the ozone reaction zone is placed in the wastewater, which has a porous structure and a surface covered with a polyethyleneimine coating. The amino group of polyethyleneimine has a good anchoring effect on organic molecules. The porous structure increases the specific surface area, which can adsorb more organic molecules. Part of the mesoporous structure is beneficial to the transmission and residence of ozone molecules, thereby improving the degradation effect of ozone on organic matter in water and the utilization rate of ozone, reducing the working frequency of the air extraction device 646 and the circulating pump 642, and improving the water quality. In this embodiment, a screen is arranged in front of the outlet pipe 6401 at the bottom of the conical tank to prevent the suspended spherical filler from being sucked into the circulating pump 642 and blocking the pipeline. The suspended spherical filler is made of transparent material, which does not affect the irradiation of ultraviolet light by the ultraviolet lamp 6410 to the water, and can promote the cooperation of ultraviolet light and ozone molecules on the organic matter in water. The particle size of the suspended spherical filler is 0.5-1.5 cm, and the particle size is too large to be not conducive to the rapid transmission of ozone gas and the disturbance of ozone to the suspended spherical filler.​

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements, or combinations of the technical features in the above embodiments do not conflict with each other, and can be combined as recorded in the embodiments, and these modifications, replacements or combinations do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An integrated landfill leachate advanced oxidation reaction device, characterized by, The device comprises a device body, which is sequentially provided with an ozone reaction zone, a photocatalytic reaction zone, an atomization zone and a gas-liquid separation zone from bottom to top; the ozone reaction zone is connected with an ozone gas source; the photocatalytic reaction zone is provided with two or more layers of ultraviolet lamp tubes arranged in an array; the atomization zone is provided with atomization nozzles; and the gas-liquid separation zone is provided with a gas-liquid separator; the device body is provided with a water outlet pipe at the bottom, which is connected with a circulating pipe and a drain pipe through a tee joint; the circulating pipe is connected with the atomization nozzles and used for circulating and conveying sewage at the bottom of the device body to the atomization nozzles above the ultraviolet lamp tubes to spray the sewage in the form of tiny droplets by the atomization nozzles; and the circulating pipe is also connected with a water inlet pipe. The circulating pipe comprises a circulating main pipe and a plurality of circulating branch pipes; the circulating main pipe is connected with the circulating branch pipes; the circulating main pipe is arranged outside the device body; and the circulating branch pipes are arranged inside the device body; at least one atomization nozzle is arranged on each of the circulating branch pipes.

2. The integrated landfill leachate advanced oxidation reaction apparatus according to claim 1, characterized by, A gas circulating pipe is arranged above the gas-liquid separator at the top of the device body; an air extraction device is arranged on the gas circulating pipe; the air extraction device and the gas circulating pipe are used for recycling gas collected at the top of the device body from the ozone reaction zone of the device body to the inside of the device body; and an air exhaust valve is also arranged at the top of the device body.

3. The integrated landfill leachate advanced oxidation reaction apparatus according to claim 1, characterized by, The ultraviolet lamp tubes are connected with an ultraviolet generator; the ultraviolet generator is arranged outside the device body; the ultraviolet lamp tubes are arranged inside the device body; a bracket is arranged along the inner wall of the device body inside the device body; the ultraviolet lamp tubes are arranged on the bracket; and the surface of the ultraviolet lamp tubes is coated with a transparent ozone-light composite catalyst coating.

4. The integrated landfill leachate advanced oxidation reaction apparatus according to claim 1, characterized by, A plurality of mounting holes are arranged on the device body and extend transversely through the device body; a light-transmitting waterproof sleeve is arranged in each of the mounting holes; the ultraviolet lamp tubes are directly arranged in the light-transmitting waterproof sleeves; the light-transmitting waterproof sleeves have open ends facing the outside of the reaction shell; and the surface of the light-transmitting waterproof sleeves is coated with a transparent ozone-light composite catalyst coating.

5. The integrated landfill leachate advanced oxidation reaction apparatus according to claim 1, characterized in that, The cross section of the ultraviolet lamp tubes is circular, elliptical, gourd-shaped or droplet-shaped; the equivalent diameter of each of the ultraviolet lamp tubes is 1-5 cm; the long axis direction of the ultraviolet lamp tubes with an elliptical cross section is arranged along the vertical direction; the ultraviolet lamp tubes are arranged in two layers or more layers and have layer spacing; the ultraviolet lamp tubes in a single layer are arranged in parallel and form tube spacing between two ultraviolet lamp tubes; the ultraviolet lamp tubes in adjacent two layers are arranged in a staggered manner, so that the ultraviolet lamp tubes in one layer are located in the tube spacing of the ultraviolet lamp tubes in another layer; or the ultraviolet lamp tubes in adjacent two layers are arranged in a crossed manner, so that the ultraviolet lamp tubes in one layer cross the ultraviolet lamp tubes in another layer in spatial position.

6. The integrated landfill leachate advanced oxidation reaction apparatus according to claim 1, characterized in that, The gas-liquid separator is composed of a group of corrugated plates arranged in an inclined manner; the horizontal spacing between adjacent corrugated plates is 1-10 mm; and the corrugated plates are coated with an ozone-light composite catalyst coating.

7. The integrated landfill leachate advanced oxidation reaction apparatus according to claim 1, characterized by, ​ 8. The integrated landfill leachate advanced oxidation reaction apparatus according to claim 1, characterized in that, The ozone gas source is an ozone generator; the ozone generator is connected to the position of the gas inlet of the ozone reaction zone which is higher than the liquid level of the sewage, a conical groove is arranged at the bottom of the device body, and the outlet pipe is arranged at the bottom of the conical groove; or the ozone generator is connected to the position of the gas inlet of the ozone reaction zone which is below the liquid level of the sewage, the ozone reaction zone is filled with 30-40% volume ratio of transparent porous suspended filler, and the surface of the transparent porous suspended filler is covered with a polyethylene imine coating.

9. The integrated landfill leachate advanced oxidation reaction apparatus according to claim 1, characterized by, The water inlet pipe is further connected with a Fenton reagent adding device.

10. The integrated landfill leachate advanced oxidation reaction apparatus according to claim 1, characterized by, The device body is made of plastic or glass fiber reinforced plastic.

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