Wastewater treatment device

Abstract

The utility model discloses a wastewater treatment device, which belongs to the technical field of wastewater treatment, and comprises a bubble generator and a reactor, the reactor is provided with a circulating water path, the bubble generator is arranged on the circulating water path, the bubble generator comprises a water inlet and a water outlet, and the water inlet is communicated with the water outlet. A bubble generating cavity with the pipe diameter decreasing and then increasing is formed in the direction from the water inlet to the water outlet, and a cutter is arranged on the side, close to the water inlet, of the bubble generating cavity. According to the scheme, a gas-liquid mixture can be formed in the bubble generator, the dissolving effect of reaction gas in waste water is improved, a Venturi tube is formed in the bubble generation cavity, the negative pressure effect can be formed on the side close to the cutter, the bubble generation rate is increased, micro-nano bubbles are formed under the action of the cutter, and the bubble generation efficiency is improved. By utilizing the characteristics of high specific surface area and long retention time in water of the nanoscale bubbles, the ozone and pollutants are fully and quickly contacted and reacted, and the ozone reaction efficiency and the utilization rate are improved.

Description

Technical Field

[0001] This utility model relates to a wastewater treatment technology, and more specifically, to a wastewater treatment device. Background Technology

[0002] Currently, the main method for treating wastewater using ozone is the ozone solid catalyst process. This process typically employs aeration discs. Ozone is generated by an ozone generator and fed into the microporous aeration discs. The discs contain pores from which ozone is released, forming numerous bubbles, which are then introduced into the water. The diameter of the bubbles generated by the aeration discs depends on the size of the pores in the discs; the bubbles are generally large, typically ranging from 0.1 to 2 mm, with some discs reaching 80 to 100 μm. Ozone forms large bubbles through the aeration disc, which come into contact with the solid catalyst during rapid ascent and react in a gas-liquid-solid three-phase environment. The effective reaction zone is limited, the probability of reaction collisions is low, and the reaction efficiency is low, which depends on the catalyst packing density. When the ozone dosage is not matched with the influent water quality, large bubbles or excess ozone are prone to overflow, causing secondary environmental pollution and wasting expensive ozone resources. Ozone catalysts are mainly metal oxides supported on a carrier. When immersed in sewage for a long time, they are prone to scaling, caking, and loss, resulting in catalyst failure. The packed catalyst can make it difficult for the water to flow between the upper and lower layers of the reactor, resulting in uneven water quality between the upper and lower layers.

[0003] For example, Chinese Patent Publication No. CN221217581U, published on June 25, 2024, describes a utility model entitled "COD Degradation Device for Wastewater," which includes a reaction tower. A wastewater filtration unit and a multi-stage ozone oxidation unit are installed on the reaction tower. The wastewater filtration unit is located at the bottom of the reaction tower, and a drain pipe is installed on one side near the top of the reaction tower. The advantages of this scheme are: within the reaction tower, ozone first decomposes the COD pollutants in the wastewater; then, the catalyst in the metal / metal oxide catalytic network fully contacts the wastewater, reducing the activation energy of the pollutant reaction and decomposing and removing COD pollutants that ozone cannot decompose; finally, the hydroxyl radicals formed by ultraviolet light-emitting diodes and ozone water further decompose the remaining COD pollutants, thereby removing various recalcitrant COD. However, this scheme uses a catalyst to improve the reaction effect, which easily leads to uneven water quality between the upper and lower layers of the catalyst, and the catalyst is prone to scaling, caking, and loss, causing blockage. Utility Model Content

[0004] This invention overcomes the problem of easy clogging in existing wastewater treatment devices and provides a wastewater treatment device. This solution adopts a bubble generation measure to reduce the volume of bubbles, increase the time bubbles stay in water, and improve the wastewater treatment effect and the utilization rate of reaction gases.

[0005] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a wastewater treatment device, including a bubble generator and a reactor, wherein the reactor is provided with a circulating water path, the bubble generator is located on the circulating water path, the bubble generator includes an inlet and an outlet, and a bubble generating chamber with a diameter that first decreases and then increases along the direction from the inlet to the outlet is provided, and a cutter is provided on the side of the bubble generating chamber near the inlet. In this solution, the bubble generator can generate a gas-liquid mixture, increasing the solubility of the reacting gas in the wastewater. A Venturi tube is formed inside the bubble generating chamber, which can create a negative pressure effect on the side near the cutter, improving the bubble generation rate. Furthermore, under the action of the cutter, micro-nano bubbles can be formed. Utilizing the high specific surface area and long residence time in water of nano-sized bubbles, ozone and pollutants can fully and rapidly contact and react, improving the ozone reaction efficiency and utilization rate.

[0006] Preferably, a projection pump is provided between the reactor and the outlet of the bubble generator. The projection pump can draw the bubbled water generated in the bubble generator into the reactor for reaction, providing power for the flow of wastewater.

[0007] Preferably, the reactor is equipped with a baffle plate dividing it into a reaction zone and an overflow zone. The reaction zone is connected to the injection pump, and its volume is larger than that of the overflow zone. The reactor has a first outlet, and the top of the baffle plate is flush with the first outlet. Designing the reaction zone to be larger allows it to hold more wastewater and gas, improving the reaction efficiency. Conversely, designing the overflow zone to be smaller allows some of the wastewater and gas mixture to be re-absorbed into the bubble generator, further enhancing the reaction efficiency between the wastewater and the reacting gases. The baffle plate design extends the flow path and range of the wastewater within the reactor.

[0008] Preferably, the projection pump includes a second inlet and a second outlet, and an impeller is provided inside the projection pump. A curved water channel is provided between the second inlet and the impeller. The curved water channel inside the projection pump can extend the flow path of the bubble water and also cause the wastewater to be disturbed to form turbulence, thereby improving the gas-liquid mixing effect.

[0009] Preferably, the bubble generator has an air inlet on the side near the water inlet, and the air inlet is connected to a gas generating device. The air inlet can provide reactive gas to the bubble generator, which mixes with the wastewater inside the bubble generator.

[0010] Preferably, the gas generating device includes a gas generating chamber and a gas outlet, the gas generating chamber being connected to the gas outlet, and the gas outlet being connected to the gas inlet. The gas generating chamber can generate a reactive gas, specifically ozone; the reactive gas is discharged through the gas outlet and then enters the gas inlet inside the bubble generator.

[0011] Preferably, the gas generator is provided with a third water inlet and a third water outlet, and a cooling chamber is provided inside the gas generator, the cooling chamber being connected to the third water inlet and the third water outlet. The cooling chamber can cool the gas inside the gas generator, and the third water inlet and the third water outlet can ensure the flow of circulating water inside the cooling chamber, thus ensuring the cooling effect.

[0012] Preferably, the reactor has a first inlet at the bottom and an exhaust port at the top. The first inlet supplies wastewater to the reactor, and its location at the bottom improves the reaction efficiency and increases the flow time of the wastewater within the reactor. The exhaust port removes excess gas from the reactor.

[0013] Preferably, the cooling chamber is located near the air outlet, and the gas generating chamber is located away from the air outlet. The cooling chamber, positioned near the air outlet, cools the gas flowing out of the gas generating device, while the gas generating chamber, located away from the air outlet, prevents the generated gas from being directly discharged.

[0014] Preferably, the gas generator is also equipped with a fan located on the side of the gas generator near the gas generating chamber. The fan can cool the gas generating chamber and cooling chamber within the gas generator, reducing the heat inside the gas generator.

[0015] Compared with the prior art, the beneficial effects of this utility model are: (1) A large number of nano-sized bubbles are generated by using a micro-nano bubble generator, which greatly increases the contact area between ozone and pollutants and prolongs the residence time of ozone bubbles in water. At the same time, the self-pressurization effect of nano-bubbles can make more ozone dissolve into water, enhance the mass transfer efficiency of the gas-liquid interface, and significantly improve the reaction speed and efficiency; (2) The wastewater is circulated up and down in the reactor by using a micro-nano jet pump. The effective reaction zone is the entire reactor, which is not limited by the height of the solid catalyst and improves the utilization rate of ozone; (3) No solid catalyst is required, which solves the problems of scaling, caking and loss when using traditional solid catalysts. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the present invention.

[0017] Figure 2 This is a schematic diagram of the bubble generator structure of this utility model.

[0018] Figure 3 This is a schematic diagram of the projection pump structure of this utility model.

[0019] Figure 4 This is a schematic diagram of the gas generating device of this utility model.

[0020] In the diagram: 1. Bubble generator, 2. Reactor, 3. Inlet, 4. Outlet, 5. Bubble generating chamber, 6. Cutter, 7. Projection pump, 8. Baffle, 9. Reaction zone, 10. Overflow zone, 11. First outlet, 12. First inlet, 13. Second inlet, 14. Second outlet, 15. Impeller, 16. Curved water channel, 17. Air inlet, 18. Gas generating chamber, 19. Air outlet, 20. Third inlet, 21. Third outlet, 22. Cooling chamber, 23. Exhaust port, 24. Fan, 25. Pump body, 26. Drive motor, 27. Pump cover, 28. Circulation inlet, 29. Circulation outlet, 30. Rotor flow meter, 31. Power switch, 32. Touch screen. Detailed Implementation

[0021] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1: As Figures 1 to 3 The wastewater treatment device shown includes a reactor 2, a bubble generator 1, a projection pump 7, and a gas generating device. The reactor 2 is equipped with a circulating water path, and the bubble generator 1, projection pump 7, and other components are arranged within this path. The gas generating device produces ozone, which reacts with the wastewater. The bubble generator 1 initially mixes the bubbles with the wastewater, forming micro- and nano-sized bubbles. The projection pump 7 pumps the wastewater and ozone mixture into the reactor 2, where it undergoes a complete reaction. This method utilizes the principle of micro- and nano-sized bubble reaction, leveraging the high specific surface area and long residence time of nano-sized bubbles to ensure sufficient and rapid contact and reaction between ozone and pollutants. This improves ozone reaction efficiency and utilization, removing COD and TOD from the wastewater and reducing its color.

[0023] Specifically, the bubble generator 1 is cylindrical in shape. Its axial ends are the inlet 3 and outlet 4, respectively. Along the direction from the inlet 3 to the outlet 4, the diameter of the tube in the middle of the bubble generator 1 first decreases and then increases to form a bubble generating chamber 5. The bubble generating chamber 5 is a Venturi tube structure. Inside the bubble generator 1, a cutter 6 is also installed. The cutter 6 is a rotatable blade structure that can fully agitate and cut the gas in the wastewater to form micro- and nano-sized bubbles. The cutter 6 is located near the bubble generator 1, close to the inlet 3, specifically in the Venturi tube. At the end of the tube structure; furthermore, an air inlet 17 is also provided on the side of the bubble generator 1 near the water inlet 3, and the air inlet 17 is located between the cutter 6 and the water inlet 3; when the wastewater enters from the water inlet 3, it is initially mixed with the ozone entering from the air inlet 17, and then it is stirred and cut by the cutter 6 to form micro-nano-sized bubble water. Then, it passes through the Venturi tube structure of the bubble generating chamber 5. The velocity of the wastewater first increases and then decreases, and the liquid flow is unstable, so that the aggregation and splitting of bubbles can effectively promote the mixing effect of bubbles and wastewater, and improve the reaction effect of ozone and wastewater.

[0024] Furthermore, the air inlet 17 is connected to a gas generating device, which can continuously provide ozone to the bubble generator 1. Preferably, when the bubble generator 1 is arranged, the air inlet 17 should be arranged downwards, so that when the gas enters the bubble generator 1, the bubbles will flow from the bottom to the top, and the flow direction of the wastewater is perpendicular to the ozone intake direction, so that the ozone and wastewater can be mixed as effectively as possible.

[0025] A projection pump 7 is also installed in the circulating water circuit. The projection pump 7 is located at the output end of the bubble generator 1, that is, between the bubble generator 1 and the reactor 2. The projection pump 7 can pump the bubble water generated in the bubble generator 1 into the reactor 2. Specifically, the projection pump 7 includes a pump body 25, a drive motor 26, a pump cover 27, and an impeller 15 located inside the pump body 25. The output end of the drive motor 26 is provided with a rotating shaft, and the impeller 15 is provided on the rotating shaft. The impeller 15 can rotate inside the pump body 25, pumping out the bubble water. The pump cover 27 is arranged at the output end of the drive motor 26 and connected to the pump body 25. The pump body 25 includes a second inlet 13 and a second outlet 14. A curved water channel 16 is arranged between the second inlet 13 and the impeller 15. The curved water channel 16 has a right-angle bend structure. When the bubble water enters the curved water channel 16, it can generate turbulence and collision in the water channel, promoting the mixing effect of ozone and wastewater. After passing through impeller 15, the bubbly water is ejected at high speed from the second outlet 14 into reactor 2. The impeller 15, the rotating shaft, and the pump body 25 are equipped with mechanical seals to effectively prevent bubbly water from entering the side where the drive motor 26 is located.

[0026] Furthermore, reactor 2 includes a first inlet 12 and a first outlet 11. Reactor 2 is a cylindrical or square tank. The first inlet 12 and the first outlet 11 are located on the same side of reactor 2, with the first inlet 12 located on the bottom side wall and the first outlet 11 located on the top side wall. The first inlet 12 supplies wastewater to reactor 2, and the first outlet 11 discharges the purified wastewater. A baffle 8 is also installed inside reactor 2, dividing the interior into a reaction zone 9 and an overflow zone 10. Reaction zone 9 is the main reaction area between wastewater and ozone, while overflow zone 10 allows the bubble water to be recycled back to the bubble generator 1 via a circulating water path. The bottom of the baffle 8 is connected to the bottom of reactor 2, and the top of the baffle 8 is flush with the first outlet 11 of reactor 2.

[0027] The reactor 3 is also equipped with a circulating inlet 28 and a circulating outlet 29. The circulating inlet 28 is connected to the second outlet 14 of the projection pump 7, and the circulating outlet 29 is connected to the inlet 3 of the bubble generator 1. An exhaust port 23 is also provided at the top of the reactor 2. The exhaust port 23 can discharge excess gas from the reactor 2. It should be noted that a tail gas destroyer needs to be installed at the exhaust port 23 to prevent unreacted gas from causing environmental pollution.

[0028] Dividing reactor 2 into two parts using baffle 8 improves the flow path and duration of the bubble water within reactor 2, enhancing the mixing effect of wastewater and ozone. Furthermore, baffle 8 is positioned away from the first inlet 12, meaning the volume of reaction zone 9 is larger than that of overflow zone 10, further increasing the residence time of bubble water in reaction zone 9. Initially, the bubble water level gradually rises from the bottom of reactor 2, then flows past the top of baffle 8 towards overflow zone 10. When the water level in overflow zone 10 also surpasses the top of baffle 8, the injection pump is activated, causing the wastewater in the circulation path to flow. This allows the water in overflow zone 10 to re-enter reaction zone 9 through the bubble generator 1 and injection pump 7. The larger volume of reaction zone 9 means a longer time for bubble water to fill it, improving the reaction effect between ozone and wastewater. Once the water level in reactor 2 reaches the first outlet 11, it is discharged through the first outlet 11.

[0029] Example 2: As Figures 1 to 4The wastewater treatment device shown includes a reactor 2, a bubble generator 1, a projection pump 7, and a gas generating device. The reactor 2 is equipped with a circulating water path, and the bubble generator 1, projection pump 7, and other components are arranged within this path. The gas generating device produces ozone, which reacts with the wastewater. The bubble generator 1 initially mixes the bubbles with the wastewater, forming micro- and nano-sized bubbles. The projection pump 7 pumps the wastewater and ozone mixture into the reactor 2, where it undergoes a complete reaction. This method utilizes the principle of micro- and nano-sized bubble reaction, leveraging the high specific surface area and long residence time of nano-sized bubbles to ensure sufficient and rapid contact and reaction between ozone and pollutants. This improves ozone reaction efficiency and utilization, removing COD and TOD from the wastewater and reducing its color.

[0030] Specifically, the bubble generator 1 is cylindrical in shape. Its axial ends are the inlet 3 and outlet 4, respectively. Along the direction from the inlet 3 to the outlet 4, the diameter of the tube in the middle of the bubble generator 1 first decreases and then increases to form a bubble generating chamber 5. The bubble generating chamber 5 is a Venturi tube structure. Inside the bubble generator 1, a cutter 6 is also installed. The cutter 6 is a rotatable blade structure that can fully agitate and cut the gas in the wastewater to form micro- and nano-sized bubbles. The cutter 6 is located near the bubble generator 1, close to the inlet 3, specifically in the Venturi tube. At the end of the tube structure; furthermore, an air inlet 17 is also provided on the side of the bubble generator 1 near the water inlet 3, and the air inlet 17 is located between the cutter 6 and the water inlet 3; when the wastewater enters from the water inlet 3, it is initially mixed with the ozone entering from the air inlet 17, and then it is stirred and cut by the cutter 6 to form micro-nano-sized bubble water. Then, it passes through the Venturi tube structure of the bubble generating chamber 5. The velocity of the wastewater first increases and then decreases, and the liquid flow is unstable, so that the aggregation and splitting of bubbles can effectively promote the mixing effect of bubbles and wastewater, and improve the reaction effect of ozone and wastewater.

[0031] Furthermore, the air inlet 17 is connected to a gas generating device, which can continuously provide ozone to the bubble generator 1. Preferably, when the bubble generator 1 is arranged, the air inlet 17 should be arranged downwards, so that when the gas enters the bubble generator 1, the bubbles will flow from the bottom to the top, and the flow direction of the wastewater is perpendicular to the ozone intake direction, so that the ozone and wastewater can be mixed as effectively as possible.

[0032] Furthermore, the gas generating device includes a gas generating chamber 18, a cooling chamber 22, a third water inlet 20, a third water outlet 21, and a gas outlet 19. The gas generating chamber 18 contains an electrolysis device that generates ozone through electrolysis. Cooling water is circulated in the cooling chamber 22 to cool the ozone within the gas generating device, preventing its unstable decomposition. Specifically, the third water inlet 20, the third water outlet 21, and the gas outlet 19 are located on the same side of the gas generating device. The cooling chamber 22 is located inside the gas generating device near the gas outlet 19, while the gas generating chamber 18 is located inside the gas generating device away from the gas outlet 19. This ensures that the ozone is adequately cooled by the cooling chamber 22, preventing direct emission of ozone. The gas generating chamber 18 is connected to the gas outlet 19 via a gas pipe. To improve cooling efficiency, the gas pipe can be coiled around the outer edge of the cooling chamber 22 or extend into its interior. The cooling chamber 22 is connected to the third water inlet 20 and the third water outlet 21, enabling continuous circulation of water.

[0033] A fan 24 is installed inside the gas generator, positioned close to the gas generating chamber 18. The fan primarily cools the gas generating chamber 18, preventing it from overheating. The gas generator also includes a rotor flow meter 30, a power switch 31, and a touchscreen display 32. The rotor flow meter detects the amount and rate of ozone generation; the power switch 31 is used to turn the gas generator on and off; and the touchscreen display 32 displays the operating status of the gas generator and allows for its control.

[0034] A projection pump 7 is also installed in the circulating water circuit. The projection pump 7 is located at the output end of the bubble generator 1, that is, between the bubble generator 1 and the reactor 2. The projection pump 7 can pump the bubble water generated in the bubble generator 1 into the reactor 2. Specifically, the projection pump 7 includes a pump body 25, a drive motor 26, a pump cover 27, and an impeller 15 located inside the pump body 25. The output end of the drive motor 26 is provided with a rotating shaft, and the impeller 15 is provided on the rotating shaft. The impeller 15 can rotate inside the pump body 25, pumping out the bubble water. The pump cover 27 is arranged at the output end of the drive motor 26 and connected to the pump body 25. The pump body 25 includes a second inlet 13 and a second outlet 14. A curved water channel 16 is arranged between the second inlet 13 and the impeller 15. The curved water channel 16 has a right-angle bend structure. When the bubble water enters the curved water channel 16, it can generate turbulence and collision in the water channel, promoting the mixing effect of ozone and wastewater. After passing through impeller 15, the bubbly water is ejected at high speed from the second outlet 14 into reactor 2. The impeller 15, the rotating shaft, and the pump body 25 are equipped with mechanical seals to effectively prevent bubbly water from entering the side where the drive motor 26 is located.

[0035] Furthermore, reactor 2 includes a first inlet 12 and a first outlet 11. Reactor 2 is a cylindrical or square tank. The first inlet 12 and the first outlet 11 are located on the same side of reactor 2, with the first inlet 12 located on the bottom side wall and the first outlet 11 located on the top side wall. The first inlet 12 supplies wastewater to reactor 2, and the first outlet 11 discharges the purified wastewater. A baffle 8 is also installed inside reactor 2, dividing the interior into a reaction zone 9 and an overflow zone 10. Reaction zone 9 is the main reaction area between wastewater and ozone, while overflow zone 10 allows the bubble water to be recycled back to the bubble generator 1 via a circulating water path. The bottom of the baffle 8 is connected to the bottom of reactor 2, and the top of the baffle 8 is flush with the first outlet 11 of reactor 2.

[0036] The reactor 3 is also equipped with a circulating inlet 28 and a circulating outlet 29. The circulating inlet 28 is connected to the second outlet 14 of the projection pump 7, and the circulating outlet 29 is connected to the inlet 3 of the bubble generator 1. An exhaust port 23 is also provided at the top of the reactor 2. The exhaust port 23 can discharge excess gas from the reactor 2. It should be noted that a tail gas destroyer needs to be installed at the exhaust port 23 to prevent unreacted gas from causing environmental pollution.

[0037] Dividing reactor 2 into two parts using baffle 8 improves the flow path and duration of the bubble water within reactor 2, enhancing the mixing effect of wastewater and ozone. Furthermore, baffle 8 is positioned away from the first inlet 12, meaning the volume of reaction zone 9 is larger than that of overflow zone 10, further increasing the residence time of bubble water in reaction zone 9. Initially, the bubble water level gradually rises from the bottom of reactor 2, then flows past the top of baffle 8 towards overflow zone 10. When the water level in overflow zone 10 also surpasses the top of baffle 8, the injection pump is activated, causing the wastewater in the circulation path to flow. This allows the water in overflow zone 10 to re-enter reaction zone 9 through the bubble generator 1 and injection pump 7. The larger volume of reaction zone 9 means a longer time for bubble water to fill it, improving the reaction effect between ozone and wastewater. Once the water level in reactor 2 reaches the first outlet 11, it is discharged through the first outlet 11.

Claims

1. A wastewater treatment device, characterized in that, The device includes a bubble generator and a reactor. The reactor is equipped with a circulating water path. The bubble generator is located on the circulating water path. The bubble generator includes an inlet and an outlet. A bubble generating chamber with a diameter that first decreases and then increases is provided along the direction from the inlet to the outlet. A cutter is provided on the side of the bubble generating chamber near the inlet.

2. The wastewater treatment device according to claim 1, characterized in that, A projection pump is provided between the reactor and the outlet of the bubble generator.

3. The wastewater treatment device according to claim 2, characterized in that, The reactor is equipped with a baffle and is divided into a reaction zone and an overflow zone. The reaction zone is connected to the projection pump. The volume of the reaction zone is larger than the volume of the overflow zone. The reactor is equipped with a first outlet. The top of the baffle is flush with the first outlet.

4. A wastewater treatment device according to claim 2 or 3, characterized in that, The projection pump includes a second inlet and a second outlet. An impeller is provided inside the projection pump, and a curved waterway is provided between the second inlet and the impeller.

5. A wastewater treatment apparatus according to any one of claims 1 to 3, characterized in that, The bubble generator has an air inlet on the side near the water inlet, and the air inlet is connected to the gas generating device.

6. A wastewater treatment device according to claim 5, characterized in that, The gas generating device includes a gas generating chamber and a gas outlet, the gas generating chamber being connected to the gas outlet and the gas outlet being connected to the gas inlet.

7. A wastewater treatment device according to claim 6, characterized in that, The gas generating device is provided with a third water inlet and a third water outlet, and a cooling chamber is provided inside the gas generating device, which is connected to the third water inlet and the third water outlet.

8. A wastewater treatment apparatus according to any one of claims 1 to 3, characterized in that, The reactor has a first water inlet at the bottom and an exhaust outlet at the top.

9. A wastewater treatment device according to claim 7, characterized in that, The cooling chamber is located on the side closer to the air outlet, while the gas generating chamber is located on the side farther from the air outlet.

10. A wastewater treatment device according to claim 9, characterized in that, The gas generating device is also equipped with a fan, which is located on the side of the gas generating device near the gas generating chamber.

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