Supersaturated dissolved oxygen equipment and method

Abstract

The present invention relates to a supersaturated dissolved oxygen device and method, the device comprising: a water inlet pipe, a water inlet is provided at the first end thereof, a submersible pump and / or a self-priming pump is provided on the water inlet pipe to extract polluted water into the water inlet pipe; a reactor, which is connected to the second end of the water inlet pipe to be in fluid communication with the water inlet pipe, the reactor is in fluid communication with the oxygen source gas through an oxygen delivery pipe, and an air inlet valve is provided on the oxygen delivery pipe; a water outlet pipe, which is provided with a water outlet ball valve, the first end of the water outlet pipe is connected to the reactor, and an inverted U-shaped pipe is provided on the water outlet pipe; and a reflux pipe, which is provided with a pipeline pump, the first end of the reflux pipe is connected to the highest point of the inverted U-shaped pipe to be in fluid communication with the inverted U-shaped pipe, and the second end of the reflux pipe is connected to the water inlet pipe to be in fluid communication with the water inlet pipe, so that a part of the water in the water outlet pipe flows back to the reactor through the water inlet pipe to pressurize the reactor. The present invention can improve the oxygenation efficiency, thereby improving the level of dissolved oxygen.

Description

Technical Field

[0001] The invention belongs to the field of water treatment, and in particular relates to a supersaturated dissolved oxygen device and method. Background Art

[0002] Supersaturated dissolved oxygen technology refers to injecting a gas-water mixture containing high concentrations of oxygen into polluted water bodies, which rapidly increases the amount of dissolved oxygen in the water body, provides sufficient environmental conditions for aerobic microbial reactions to remove pollutants, and promotes the rapid oxidation of H2S and FeS and other black and odor-causing substances produced during anaerobic degradation of organic matter, improves water quality, gradually increases water transparency, and strengthens water activity, effectively improving or alleviating black and odor and water quality. It reduces COD, BOD, TN, and TP in water bodies, and plays a role in water purification. It is mainly used in surface water, sewage purification and ecological restoration projects.

[0003] In the current technology, a single device cannot simultaneously meet the requirements of high concentration increase of gas dissolution level, large-scale water treatment, and high oxygenation efficiency. Several existing technology devices can be used simultaneously to meet the large-scale water treatment volume. For example, the water treatment volume of general nano aeration equipment is 10-30 cubic meters / hour, and the water treatment volume of surface aeration is 20 cubic meters / hour. Large bubble aeration requires the installation of pipelines of corresponding area at the bottom of the river in a closed manner. In the current technology, the gas dissolution level is low. For example, the dissolved oxygen concentration provided by surface aeration is generally 1-3 mg / L, and the dissolved oxygen concentration of nano aeration is 6-8 mg / L.

[0004] The information disclosed in this background technology section is only intended to deepen the understanding of the general background technology of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0005] The object of the present invention is to provide a supersaturated dissolved oxygen device and method, which can improve the oxygenation efficiency and thus improve the level of dissolved oxygen, and can meet the requirements of high concentration increased gas dissolution level, large-scale water treatment, and high oxygenation efficiency.

[0006] The objective of the present invention is achieved through the following technical solutions:

[0007] A supersaturated dissolved oxygen device, comprising: a water inlet pipe, a first end of which is provided with a water inlet, the water inlet pipe is provided with a submersible pump and / or a self-priming pump to extract polluted water into the water inlet pipe; a reactor, which is connected to the second end of the water inlet pipe to be in fluid communication with the water inlet pipe, and the reactor is in gas communication with an oxygen source through an oxygen delivery pipe, the oxygen delivery pipe is provided with an air inlet valve; a water outlet pipe, which is provided with a water outlet ball valve, the first end of the water outlet pipe is connected to the reactor to be in fluid communication with the reactor, the water outlet pipe is provided with an inverted U-shaped pipe; and a reflux pipe, which is provided with a pipeline pump, the first end of the reflux pipe is connected to the highest point of the inverted U-shaped pipe to be in fluid communication with the inverted U-shaped pipe, the second end of the reflux pipe is connected to the water inlet pipe to be in fluid communication with the water inlet pipe, so that a part of the water in the water outlet pipe flows back to the reactor through the water inlet pipe to pressurize the reactor.

[0008] Preferably, a grid for filtering dirt in the polluted water body is provided at the water inlet of the water inlet pipe.

[0009] Preferably, the second end of the water inlet pipe is connected to the top of the reactor, and a baffle is provided at the connection between the water inlet pipe and the reactor to allow the polluted water to enter the reactor in a jetting manner.

[0010] Preferably, an exhaust valve is provided at the highest point of the water inlet pipe to exhaust the air in the equipment when the supersaturated dissolved oxygen equipment is ready for startup and working, thereby ensuring the pressure of the supersaturated dissolved oxygen equipment, and the exhaust valve only allows gas to pass but not water.

[0011] Preferably, the upper part of the reactor is conical or the entire reactor has an arc-shaped profile.

[0012] Preferably, the first end of the water outlet pipe is connected to the lower part of the reactor, and the inverted U-shaped pipe is connected to the water outlet pipe at a position close to the first end of the water outlet pipe.

[0013] Preferably, the water outlet pipe is provided with a plurality of water distribution pipes for discharging oxygenated water, the water distribution pipe is provided with a plurality of drainage holes, the diameters of the plurality of drainage holes increase sequentially along the drainage direction and / or the distribution density of the plurality of drainage holes increases sequentially along the drainage direction, and a threaded cover is provided at the end of the water distribution pipe.

[0014] Preferably, the inner diameters of the water inlet pipe, the water outlet pipe and the return pipe range from 150 mm to 350 mm.

[0015] Preferably, the predetermined pressure range in the reactor is 0.1-1.6 MPa.

[0016] Furthermore, a method for supersaturated dissolved oxygen is provided, which is implemented by using the above-mentioned supersaturated dissolved oxygen equipment, and the method comprises the following steps:

[0017] 1) To prepare for startup, close the water outlet ball valve of the water outlet pipe and the air inlet valve of the oxygen delivery pipe, open the exhaust valve on the water inlet pipe, and at the same time, turn on the submersible pump and / or self-priming pump on the water inlet pipe, and exhaust the air in the equipment by means of water inlet;

[0018] 2) After the exhaust is completed, the air inlet valve of the oxygen delivery pipe, the water outlet ball valve of the water outlet pipe and the pipeline pump of the reflux pipe are opened, and the exhaust valve is kept open, and the polluted water body is pumped into the reactor through the water inlet pipe, and oxygen is supplied to the reactor at the same time, so as to oxygenate the polluted water body in the reactor;

[0019] 3) The pipeline pump on the reflux pipe makes the oxygenated water flowing into the outlet pipe flow through the inverted U-shaped pipe, and part of the oxygenated water and the oxygen not dissolved in the water in the outlet pipe flow back into the reflux pipe, and then return to the reactor through the inlet pipe, thereby pressurizing the reactor to improve the efficiency of oxygenating the polluted water;

[0020] 4) Another part of the oxygenated water in the outlet pipe flows out of the outlet pipe.

[0021] The beneficial effects of the present invention are:

[0022] To improve oxygenation efficiency, the gas dissolution level can be adjusted, and the upper limit of dissolved oxygen is higher. For example, according to the pressure adjustment, the effluent dissolved oxygen can be adjusted, that is, 20mg / L, 40mg / L, 60mg / L, 80mg / L, 100mg / L, 200mg / L, 300mg / L, 400mg / L.

[0023] The amount of treated water can be increased and is adjustable, i.e., 50m3 / h, 100m3 / h, 150m3 / h, 200m3 / h, 250m3 / h, 300m3 / h, 350m3 / h, 400m3 / h, 450m3 / h, 500m3 / h, 550m3 / h, 600m3 / h.

[0024] The reactor is airtight, oxygen does not overflow, there is no partition or loop in the reactor chamber, the water flow is in a fully mixed turbulent state, and the oxygenation efficiency is 90% to 99%.

[0025] The existing general water supply and drainage system increases the pressure of the tank by compressing the air in the tank. However, the tank (reactor) pressure of the present invention is maintained by regulating the water pump. Under the same power consumption, the water volume processed by the present invention is much greater than that of the existing general system, reducing energy consumption.

[0026] The existing general oxygenation water treatment equipment has thin pipes, generally with a diameter of 15mm to 100mm. The pipe diameter of the present invention can be 150mm, 200mm, 250mm, 300mm, 350mm. There will be no blockage caused by accumulation of pollutants or algae in the equipment. At the same time, the large diameter pipe can reduce the loss along the pipe and the dynamic potential energy of the water body. At the same power, more energy is converted into the pressure of the reactor, which increases the dissolved oxygen level and the dissolved oxygen injection amount.

[0027] The existing general oxygenated water treatment equipment has relatively thin pipes and requires that the diameter of the particles in the inlet water should not be higher than 50 microns, while the inlet water of the equipment of the present invention can meet the requirements of particles below 100 mm and meet various construction conditions.

[0028] The equipment is not easy to be clogged and the cleaning work is simple. You only need to open the threaded cover at the end of the water outlet system, the blockage will be discharged by high pressure, and then put the threaded cover back on for normal use. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of a supersaturated dissolved oxygen device according to one embodiment of the present invention;

[0030] Figure 2 It is a structural schematic diagram of a supersaturated dissolved oxygen device according to another embodiment of the present invention;

[0031] Figures 3 to 6 Graphs of dissolved oxygen level vs. flow rate according to Example 1, Example 2, Example 3 and Example 4 of the present invention respectively;

[0032] Figures 7 to 10 Graphs of daily oxygen injection volume vs. flow rate according to Example 1, Example 2, Example 3 and Example 4 of the present invention respectively;

[0033] Figures 11 to 14 The graphs are respectively graphs of daily oxygen injection amount vs. power according to Example 1, Example 2, Example 3 and Example 4 of the present invention.

[0034] Description of reference numerals:

[0035] 1—water inlet pipe; 2—water inlet; 3—submersible pump; 4—self-priming pump; 5—reactor; 6—oxygen delivery pipe; 7—water outlet pipe; 8—water outlet ball valve; 9—inverted U-shaped pipe; 10—reflux pipe; 11—pipeline pump; 12—grid; 13—baffle; 14—exhaust valve; 15—water distribution pipe; 16—drain hole.

[0036] It should be understood that the attached drawings are not drawn to scale, but are merely simplified drawings of various features for the purpose of illustrating the basic principles of the present invention. The specific design features of the present invention disclosed herein, including, for example, specific dimensions, directions, positions, and shapes, will be determined in part by the specific intended application and use environment. In the attached multiple drawings, the same or equivalent components (elements) are referenced with the same reference numerals. DETAILED DESCRIPTION

[0037] The present invention will be further described below in conjunction with specific implementation schemes and corresponding drawings.

[0038] like Figure 1 As shown, the supersaturated dissolved oxygen device according to one embodiment of the present invention comprises: a water inlet pipe 1, a water inlet 2 is provided at a first end thereof, a submersible pump 3 and a self-priming pump 4 are provided on the water inlet pipe 1 (of course, only a submersible pump or only a self-priming pump may be used) to extract polluted water into the water inlet pipe 1; a reactor 5, which is connected to the second end of the water inlet pipe 1 to be in fluid communication with the water inlet pipe 1, and the reactor 5 is in fluid communication with an oxygen source gas through an oxygen delivery pipe 6, and an air inlet valve is provided on the oxygen delivery pipe 6; a water outlet pipe 7 , which is provided with a water outlet ball valve 8, the first end of the water outlet pipe 7 is connected to the reactor 5 to be fluidically connected to the reactor 5, and an inverted U-shaped pipe 9 is provided on the water outlet pipe 7; and a reflux pipe 10, which is provided with a pipeline pump 11, the first end of the reflux pipe 10 is connected to the highest point of the inverted U-shaped pipe 9 to be fluidically connected to the inverted U-shaped pipe 9, and the second end of the reflux pipe 10 is connected to the water inlet pipe 1 to be fluidically connected to the water inlet pipe 1, so that a part of the water in the water outlet pipe 7 flows back to the reactor 5 through the water inlet pipe 1 to pressurize the reactor 5.

[0039] The oxygenation efficiency is to improve the upper limit of dissolved oxygen saturation in the reactor according to Henry's law. According to Henry's law, under the same conditions, the greater the gas pressure, the higher the solubility. Therefore, in order to ensure that the reactor has a sufficiently high pressure to improve the oxygenation efficiency, the present invention is provided with a reflux structure, that is, an inverted U-shaped tube is set at the outlet pipe, and at the highest point of the inverted U-shaped tube, a part of the oxygenated water body flows into the reflux pipe, and the oxygen not dissolved in the water also flows into the reflux pipe, and then flows back to the reactor from the inlet pipe, and the reactor is pressurized to ensure that a higher pressure is maintained in the reactor. Under higher pressure, the oxygenation efficiency of the reactor can be improved. In addition, the input of pure oxygen is also advantageous for improving the efficiency of dissolved oxygen. According to the law of partial pressure, oxygen accounts for about 20% of air, and the oxygen in the air can only provide 1 / 5 of the pressure. In other words, under the same pressure, temperature and time, the efficiency of pure oxygen input dissolved oxygen is five times that of air input. Based on the above, the high-pressure and high-concentration oxygen source of the equipment can improve the dissolved oxygen level.

[0040] According to the pressure regulation, the dissolved oxygen level is also adjustable, which can be adjusted to 20mg / L, 40mg / L, 60mg / L, 80mg / L, 100mg / L, 200mg / L, 300mg / L, 400mg / L, 450m3 / h, 500m3 / h, 550m3 / h, 600m3 / h.

[0041] This equipment can increase the amount of water treated, and the amount of water treated is adjustable, i.e., 50m3 / h, 100m3 / h, 150m3 / h, 200m3 / h, 250m3 / h, 300m3 / h, 350m3 / h, 400m3 / h.

[0042] The reactor is airtight, oxygen does not overflow, there is no partition or loop in the reactor chamber, the water flow is in a fully mixed turbulent state, and the oxygenation efficiency is 90% to 99%.

[0043] In this embodiment, a grid 12 for filtering dirt in the polluted water is provided at the water inlet 2 of the water inlet pipe 1. The grid is made of stainless steel and welded with 8mm thick steel bars, and the grid aperture is 4×4cm. Of course, other materials can also be used, and the aperture can also be designed according to actual needs. The grid is used to isolate larger dirt in the polluted water to avoid clogging the equipment.

[0044] In this embodiment, the second end of the water inlet pipe 1 is connected to the top of the reactor 5, and a baffle 13 is provided at the connection between the water inlet pipe 1 and the reactor 5 so that the polluted water enters the reactor 5 in a jetting manner. The oxygen delivery pipe 6 is connected to the reactor near the connection between the water inlet pipe 1 and the reactor 5. Water falls from a high place and compresses the oxygen in the reactor 5 downward, generating a violent movement between the two, and the water flow is in a fully mixed turbulent state, producing highly concentrated oxygenated water or superoxygen saturated water. The baffle 13 increases the diameter of the water flow, allowing the water to enter the reactor in a jetting manner, thereby increasing the contact area between water and oxygen, which helps to improve the oxygenation efficiency.

[0045] In this embodiment, an exhaust valve 14 is provided at the highest point of the water inlet pipe 1 to exhaust the air in the equipment when the supersaturated dissolved oxygen equipment is ready for startup, and the exhaust valve only allows gas to pass through but does not allow water to pass through. In order to ensure a pure oxygen environment in the reactor and to control the pressure in the reactor, the air in the equipment needs to be exhausted through the exhaust valve during startup preparation.

[0046] In this embodiment, the reactor 5 is a long structure extending in the vertical direction, and the top is arc-shaped, so as to ensure that the polluted water has enough mixing space with the oxygen when spraying downward.

[0047] In this embodiment, the first end of the outlet pipe 7 is connected to the lower part of the reactor 5, and the inverted U-shaped pipe 9 is connected to the outlet pipe 7 at a position close to the first end of the outlet pipe 7. The oxygenated water flows into the outlet pipe from the lower part of the reactor to ensure that the water is fully in contact with oxygen before flowing out. The oxygenated water flowing into the outlet pipe first flows through the inverted U-shaped pipe. At the highest point of the inverted U-shaped pipe, the oxygenated water flows into the return pipe due to gravity, and then flows back to the reactor through the inlet pipe to achieve the purpose of pressurization.

[0048] In this embodiment, a plurality of water distribution pipes 15 for discharging oxygenated water are provided on the water outlet pipe 7, and a plurality of drainage holes 16 are provided on the water distribution pipe 15. In order to ensure uniform water discharge, the diameters of the plurality of drainage holes 16 increase successively along the drainage direction and / or the distribution density of the plurality of drainage holes 16 increases successively along the drainage direction, and a threaded cover is provided at the end of the water distribution pipe 15.

[0049] The water outlet ball valve 8 on the water outlet pipe 1 can control the pressure of the water outlet, and the design of the drainage hole 16 on the water distribution pipe 15 can also control the water flow of the water outlet to prevent the oxygenated water from pouring out at a large pressure.

[0050] The equipment is not easy to be clogged and the cleaning work is easy. You only need to open the threaded cap at the end of the water distribution pipe, the blockage will be discharged with high pressure, and then put the threaded cap back on for normal use.

[0051] The treated sewage is discharged back into the water body through rows of small holes on the water distribution pipe. If used in a river channel, the height difference between the water distribution pipe and the water surface is at least 2m to increase the time for the treated sewage to be fully mixed with the water body so that oxygen does not overflow into the air.

[0052] The inner diameters of the water inlet pipe, the water outlet pipe and the return pipe range from 150 mm to 350 mm.

[0053] The existing general oxygenation water treatment equipment has thin pipes, generally with a diameter of 15mm to 100mm. The pipe diameter of the present invention can be 150mm, 200mm, 250mm, 300mm, 350mm. There will be no blockage caused by accumulation of pollutants or algae in the equipment. At the same time, the large diameter pipe can reduce the loss along the pipe and the dynamic potential energy of the water body. At the same power, more energy is converted into the pressure of the reactor, which increases the dissolved oxygen level and the dissolved oxygen injection amount.

[0054] The existing general oxygenated water treatment equipment has relatively thin pipes and requires that the diameter of the particles in the inlet water should not be higher than 50 microns, while the inlet water of the equipment of the present invention can meet the requirements of particles below 100 mm and meet various construction conditions.

[0055] In this embodiment, the predetermined pressure range in the reactor is 0.1 MPa to 1.6 MPa.

[0056] The existing general water supply and drainage system increases the pressure of the tank by compressing the air in the tank. However, the tank (reactor) pressure of the present invention is maintained by regulating the water pump. Under the same power consumption, the water volume processed by the present invention is much greater than that of the existing general system, reducing energy consumption.

[0057] like Figure 2 As shown, according to another embodiment of the present invention, a supersaturated dissolved oxygen device is provided. Figure 1 The embodiment shown differs only in the shape of the reactor, which in this embodiment is conical at the top.

[0058] The following describes the working process of the supersaturated dissolved oxygen device of the present invention by taking the treatment of polluted water in a river as an example.

[0059] The water inlet pipe draws water from the middle layer of the water body. The length of the water outlet pipe along the river bank is 200 meters, that is, 100 meters on each side of the equipment. Since the equipment is specially designed for tidal rivers, the water outlet on one side can be adjusted according to the flow direction of the river water. The length of the water distribution pipe needs to be adjusted according to the actual situation. In this example, the 6m water distribution pipe is located in the central area of ​​the river section. A large number of special micropores (drainage holes) are prefabricated in the main body of the water distribution pipe to allow the oxygen-rich flow to flow into the river water in the central area of ​​the river section.

[0060] Other parameters:

[0061] [Rated power] 30 kW, 380 volts (excluding oxygen production system).

[0062]

Ambient temperature

[0063] [Weight] The equipment weighs 1.6 tons and 3.1 tons when running with water.

[0064]

Performance parameters

[0065] Dissolved oxygen in effluent water: ≥50mg / L, treated water volume: 210m3 / h, 24-hour operation, daily treated water volume: 5040m3 / d.

[0066] [Operation Mode] Depending on project requirements, it can run continuously 24 hours a day or intermittently in different time periods.

[0067] 1) First, prepare the equipment for startup. Close the water outlet ball valve of the water outlet pipe and the air inlet valve of the oxygen delivery pipe, open the exhaust valve on the water inlet pipe, and at the same time, turn on the submersible pump and / or self-priming pump on the water inlet pipe, and exhaust the air in the equipment by means of water inlet;

[0068] 2) After the exhaust is completed, the air inlet valve of the oxygen delivery pipe, the water outlet ball valve of the water outlet pipe and the pipeline pump of the reflux pipe are opened, and the exhaust valve is kept open, and the polluted water body is pumped into the reactor through the water inlet pipe, and oxygen is supplied to the reactor at the same time, so as to oxygenate the polluted water body in the reactor;

[0069] 3) The pipeline pump on the reflux pipe makes the oxygenated water flowing into the outlet pipe flow through the inverted U-shaped pipe, and part of the oxygenated water and the oxygen not dissolved in the water in the outlet pipe flow back into the reflux pipe, and then return to the reactor through the inlet pipe, thereby pressurizing the reactor to improve the efficiency of oxygenating the polluted water;

[0070] 4) Another part of the oxygenated water in the outlet pipe flows out of the outlet pipe.

[0071] It can improve the oxygenation efficiency and thus increase the level of dissolved oxygen, which can meet the requirements of increasing the gas dissolution level at high concentration, large-scale water treatment, and high oxygenation efficiency.

[0072] The following are examples of four supersaturated dissolved oxygen devices according to the invention. The parameters of the four devices are shown in Table 1 below.

[0073] Table 1: Equipment parameters

[0074]

[0075] in:

[0076] The rated power is the total rated power of all pumps in the equipment. There are no other power consuming components except the oxygen concentrator system.

[0077] The outlet water dissolved oxygen is the minimum value of the outlet water dissolved oxygen recommended by the equipment.

[0078] The water throughput is the flow rate corresponding to the dissolved oxygen in the water discharged by the equipment per hour.

[0079] The daily water throughput is the flow rate corresponding to the dissolved oxygen in the water discharged by the equipment every day.

[0080] The deadweight of the equipment is the sum of the weight of the reactor tank, the pipelines in the equipment and all the water pumps in the equipment.

[0081] The water-containing operating weight is the sum of the weight of the reactor tank, the pipelines in the equipment, all water pumps in the equipment and the water in the equipment.

[0082] Figures 3 to 6 The graphs are respectively the dissolved oxygen level vs. flow rate of Example 1, Example 2, Example 3 and Example 4. According to actual measurements, it is found that when the flow rate gradually increases, the dissolved oxygen level first increases and then decreases.

[0083] Figures 7 to 10The graphs of daily oxygen injection vs. flow rate for Example 1, Example 2, Example 3, and Example 4 are shown respectively, where daily oxygen injection = effluent dissolved oxygen level × flow rate. According to actual measurements, as the flow rate of the equipment increases, the daily oxygen injection increases first and then decreases. This is because when the flow rate increases to a certain extent, the effluent dissolved oxygen begins to decrease, resulting in a decrease in the total oxygen injection.

[0084] Figures 11 to 14 The graphs are respectively the daily oxygen injection volume vs. power of Example 1, Example 2, Example 3 and Example 4. According to actual measurements, the equipment flow rate and power are linearly related, so the curve changes are similar.

[0085] The foregoing description of specific exemplary embodiments of the present invention is presented for the purpose of illustration and description. The foregoing description is not intended to be exhaustive, nor is it intended to limit the present invention to the precise form disclosed, and it is apparent that many changes and variations are possible in light of the above teachings. The exemplary embodiments are selected and described to explain the specific principles of the present invention and its practical application, so that other technicians in the field can realize and utilize various exemplary embodiments of the present invention and various selected forms and modified forms thereof. The scope of the present invention is intended to be limited by the appended claims and their equivalents.

Claims

1. A supersaturated dissolved oxygen device, characterized in that: include: A water inlet pipe, a water inlet is provided at a first end thereof, a submersible pump and / or a self-priming pump is provided on the water inlet pipe to draw polluted water into the water inlet pipe, and an exhaust valve is provided at the highest point of the water inlet pipe to exhaust air in the equipment when the supersaturated dissolved oxygen equipment is ready for startup and when it is working, thereby ensuring the pressure of the supersaturated dissolved oxygen equipment; A reactor, wherein the second end of the water inlet pipe is connected to the top of the reactor to be in fluid communication with the reactor, a baffle is provided at the connection between the water inlet pipe and the reactor to allow the polluted water to enter the reactor in a jetting manner, and the reactor is in gas communication with an oxygen source through an oxygen delivery pipe, and an air inlet valve is provided on the oxygen delivery pipe; a water outlet pipe provided with a water outlet ball valve, a first end of the water outlet pipe being connected to the lower part of the reactor to be in fluid communication with the reactor, an inverted U-shaped pipe being provided on the water outlet pipe, the inverted U-shaped pipe being connected to the water outlet pipe at a position close to the first end of the water outlet pipe, a plurality of water distribution pipes for discharging oxygenated water being provided on the water outlet pipe, a plurality of drainage holes being provided on the water distribution pipe, the diameters of the plurality of drainage holes being increased sequentially along the drainage direction and / or the distribution density of the plurality of drainage holes being increased sequentially along the drainage direction, and a threaded cap being provided at the end of the water distribution pipe; and A reflux pipe is provided with a pipeline pump, wherein the first end of the reflux pipe is connected to the highest point of the inverted U-shaped pipe to communicate with the inverted U-shaped pipe fluid, and the second end of the reflux pipe is connected to the water inlet pipe to communicate with the water inlet pipe fluid, so that a part of the water in the water outlet pipe flows back into the reactor through the water inlet pipe to pressurize the reactor.

2. The supersaturated dissolved oxygen equipment according to claim 1, characterized in that: A grid for filtering dirt in the polluted water body is arranged at the water inlet of the water inlet pipe.

3. The supersaturated dissolved oxygen equipment according to claim 1, characterized in that: The exhaust valve allows only gas to pass through but not water.

4. The supersaturated dissolved oxygen equipment according to claim 1, characterized in that: The upper part of the reactor is conical or the entire reactor has an arc-shaped profile.

5. The supersaturated dissolved oxygen equipment according to claim 1, characterized in that: The inner diameters of the water inlet pipe, the water outlet pipe and the return pipe range from 150 mm to 350 mm.

6. The supersaturated dissolved oxygen equipment according to claim 1, characterized in that: The predetermined pressure range in the reactor is 0.1-1.6 MPa.

7. A method for supersaturated dissolved oxygen, which is achieved by using the supersaturated dissolved oxygen equipment according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: 1) To prepare for startup, close the water outlet ball valve of the water outlet pipe and the air inlet valve of the oxygen delivery pipe, open the exhaust valve on the water inlet pipe, and at the same time, turn on the submersible pump and / or self-priming pump on the water inlet pipe, and exhaust the air in the equipment by means of water inlet; 2) After the exhaust is completed, open the air inlet valve of the oxygen delivery pipe, the water outlet ball valve of the water outlet pipe and the pipeline pump of the reflux pipe, and keep the exhaust valve open, draw the polluted water into the reactor through the water inlet pipe, and supply oxygen to the reactor at the same time, so as to oxygenate the polluted water in the reactor; 3) The pipeline pump on the return pipe makes the oxygenated water flowing into the outlet pipe flow through the inverted U-shaped pipe, and part of the oxygenated water and the oxygen not dissolved in the water in the outlet pipe flow back into the return pipe, and then return to the reactor through the inlet pipe, thereby pressurizing the reactor to improve the efficiency of oxygenating the polluted water; 4) Another part of the oxygenated water in the outlet pipe flows out of the outlet pipe.

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