A high-efficiency sewage treatment system
By combining a circulating pump, jet injector, and three-phase separator within the fluidized bed reactor, the problem of low ozone utilization rate was solved, achieving improved ozone utilization and mass transfer efficiency without increasing the reactor height, thus reducing wastewater treatment costs.
Patent Information
- Application Number
- CN202522510298.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-26
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-11-26
AI Technical Summary
Existing ozone catalytic oxidation reactors have low ozone utilization rates in confined spaces, resulting in high wastewater treatment costs and poor mass transfer performance.
The system employs a combination of a fluidized bed reactor, an ozone generator, a circulating pump, and an ejector. The circulating pump mixes wastewater and ozone, which then circulates within the fluidized bed reactor to extend the ozone residence time. The mass transfer process is enhanced by a fluidized bed lift and a flow guide tube, and a three-phase separator is used to achieve gas-liquid-solid three-phase separation.
Without increasing the reactor height, it significantly improves ozone utilization, reduces ozone consumption and operating energy consumption, enhances mass transfer efficiency, and is suitable for space-constrained wastewater treatment scenarios.
Smart Images
Figure CN224930378U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a high-efficiency wastewater treatment system. Background Technology
[0002] Catalytic ozone oxidation technology utilizes hydroxyl radicals (•OH) generated by ozone decomposition to oxidize and decompose organic matter. Due to its advantages such as strong oxidizing power, non-selectivity, and no secondary pollution, it has become a hot topic in the deep treatment of wastewater. It further oxidizes the difficult-to-degrade and poorly biochemical organic matter remaining in the water after biochemical treatment to form CO2 and H2O, ensuring that the wastewater meets the discharge standards.
[0003] However, current ozone catalytic oxidation reactors generally suffer from problems such as low ozone utilization, high operating costs, and strong odor in the exhaust gas. The main reason is that the catalyst is prone to clogging and caking, resulting in insufficient contact between ozone, wastewater, and the catalyst, poor mass transfer, and difficulty in further reducing the COD value of wastewater, leading to low ozone utilization and high wastewater treatment costs. The traditional approach is to increase the height of the reactor to increase the residence time of ozone in the water and improve ozone utilization; however, this method is not suitable for space-constrained scenarios.
[0004] Therefore, there is an urgent need for a highly efficient wastewater treatment system that can increase the residence time of ozone in the reactor and improve the utilization rate of ozone without increasing the height of the reactor. Utility Model Content
[0005] The purpose of this invention is to provide a high-efficiency wastewater treatment system that aims to solve the technical problem of low ozone utilization in confined spaces in the prior art.
[0006] To achieve the above objectives, this utility model provides a high-efficiency wastewater treatment system, including a fluidized bed reactor, an ozone generator, a circulating pump, and an ejector.
[0007] The fluidized bed reactor includes an inlet chamber and a fluidized bed reaction chamber connected sequentially from bottom to top; a fluidized bed riser, a flow guide tube, and a three-phase separator arranged coaxially from bottom to top in the fluidized bed reaction chamber;
[0008] The ozone generator is used to produce ozone;
[0009] The inlet of the circulating pump is connected to the sewage tank, and is used to pump sewage through the inlet chamber to the fluidized bed reaction chamber;
[0010] The outlet of the circulating pump is connected to the first inlet of the jet injector, the outlet of the ozone generator is connected to the second inlet of the jet injector, and the outlet of the jet injector is connected to the water inlet chamber.
[0011] The three-phase separator has a reflux port at the top of the settling zone, and the reflux port is connected to the inlet of the circulating pump.
[0012] As a further improvement to the above scheme, the water inlet chamber is also equipped with a water distributor, which is used to evenly distribute the wastewater mixed with ozone into the fluidized bed reaction chamber.
[0013] As a further improvement to the above solution, the water distributor is a perforated plate.
[0014] As a further improvement to the above solution, the bottom of the three-phase separator is configured as a funnel shape, and the funnel is connected to the top of the fluidized bed reaction chamber; preferably, the diameter of the funnel is larger than the outer diameter of the fluidized bed reaction chamber.
[0015] The three-phase separator is provided with an exhaust port at the top and a settling zone on its outer side, which is arranged circumferentially around the outside of the guide tube; an overflow weir is provided above the settling zone and a water outlet trough is provided on the outer side of the overflow weir to receive the purified water overflowing through the overflow weir.
[0016] As a further improvement to the above solution, the top of the three-phase separator is provided with an exhaust gas collection chamber, and the top of the exhaust gas collection chamber is provided with an exhaust pipe.
[0017] As a further improvement to the above scheme, a drain valve is provided at the bottom of the fluidized bed reaction chamber to remove bottom sludge.
[0018] As a further improvement to the above scheme, the fluidized bed reaction chamber is also provided with a sampling port.
[0019] As a further improvement to the above solution, a filter is also provided between the sewage tank and the inlet of the circulating pump for preliminary filtration of sewage.
[0020] As a further improvement to the above solution, a drain valve is also provided at the bottom of the water outlet tank.
[0021] As a further improvement to the above solution, the guide tube is also provided with a double helical stirring blade; preferably, the double helical stirring blade is connected to the stirrer through a connecting rod.
[0022] Because this utility model adopts the above technical solutions, the beneficial effects of this application are as follows:
[0023] This invention provides a high-efficiency wastewater treatment system. Through optimized structural design, it effectively improves ozone utilization without increasing reactor height. Specifically, a circulating pump pumps wastewater from the wastewater tank into the first inlet of the ejector, where it mixes with ozone generated by the ozone generator and is then fed into the inlet chamber, forming a "wastewater-ozone" mixed fluid. After being dispersed by the fluidized bed reaction chamber's fluidized bed lift and guide tube, the mixed fluid fully contacts and reacts with pollutants in the wastewater. A portion of the reacted fluid flows back to the circulating pump inlet through the return port at the top of the three-phase separator's settling zone, and re-enters the ejector for recirculation. This circulation path extends the flow path of the "wastewater-ozone" mixed fluid within the reactor, thereby increasing the actual residence time of ozone within the reactor.
[0024] The jet injector, by entraining ozone with a high-speed water flow, increases the actual ozone dosage. Simultaneously, the jet injector generates micro-nano bubbles, significantly increasing ozone solubility in water. Furthermore, the bursting of these bubbles generates additional hydroxyl radicals, further enhancing the oxidation reaction. Ultimately, this improves ozone utilization while reducing ozone consumption. Additionally, the fluidized bed reactor's fluidized bed lift promotes turbulent flow of the wastewater-ozone mixture, and the guide tube's constraint on the flow direction enhances the mass transfer of ozone from the gas phase to the liquid phase. The three-phase separator effectively separates the gas, liquid, and solid phases, preventing the disorderly escape of ozone with the exhaust gas and further improving ozone utilization. This invention improves ozone utilization efficiency. The guide tube employs a catalyst fluidized bed riser structure, which reduces pressure drop in the expansion zone through the fluidized movement of catalyst particles, thus lowering system operating energy consumption. Simultaneously, the fluidized catalyst is thoroughly mixed with wastewater and ozone, enhancing the three-phase contact strength and significantly improving the mass transfer efficiency of ozone from the gas phase to the liquid phase, avoiding mass transfer losses caused by uneven mixing in traditional structures. Furthermore, this invention replaces the traditional method of extending the time by increasing reactor height with a circulating flow path design, achieving an extended ozone residence time while maintaining a constant reactor height. This is particularly suitable for wastewater treatment scenarios where equipment installation height is limited. Attached Figure Description
[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0026] Figure 1 This is a schematic diagram of a high-efficiency wastewater treatment system disclosed in this utility model;
[0027] Figure label:
[0028] 1. Fluidized bed reactor; 11. Inlet tank; 12. Fluidized bed reaction chamber; 13. Fluidized bed riser; 14. Flow guide tube; 15. Three-phase separator; 151. Exhaust port; 152. Settling zone; 153. Overflow weir; 154. Outlet tank;
[0029] 16. Return port; 2. Ozone generator; 3. Circulation pump; 4. Ejector; 5. Water distributor; 6. Drain valve; 7. Sampling port; 8. Filter; 9. Drain valve.
[0030] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0032] It should be noted that all directional indicators (such as up, down, etc.) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.
[0033] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.
[0034] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0035] See Figure 1 This utility model provides a high-efficiency sewage treatment system, including a fluidized bed reactor 1, an ozone generator 2, a circulating pump 3, and an ejector 4;
[0036] The fluidized bed reactor 1 is a vertical cylindrical structure, consisting of an inlet chamber 11 and a fluidized bed reaction chamber 12 from bottom to top, which are connected by a bottom opening. The fluidized bed reaction chamber 12 contains a fluidized bed riser 13, a flow guide tube 14, and a three-phase separator 15 arranged coaxially along the axial direction. The fluidized bed riser 13 is a porous distribution plate or gas riser structure located at the bottom of the reaction chamber, with its top sealed to the bottom of the flow guide tube 14. The flow guide tube 14 is a cylindrical structure extending vertically, with a diameter smaller than the inner wall of the reaction chamber, and its top extends to below the three-phase separator 15. The three-phase separator 15 includes an upper settling zone 152 and a lower gas-liquid separation zone, located at the top of the flow guide tube 14, and is used to separate and guide the gas, liquid, and solid phases.
[0037] Ozone generator 2 is connected to the second inlet of ejector 4 via a gas pipeline to generate ozone and deliver it to ejector 4; the inlet of circulating pump 3 is connected to sewage tank via sewage pipeline, and the outlet is connected to the first inlet of ejector 4; the outlet of ejector 4 is connected to the inlet chamber 11 of fluidized bed reactor 1 via a mixed fluid pipeline; a reflux port 16 is provided on the upper part of the settling zone 152 of three-phase separator 15, and the reflux port 16 is connected to the inlet of circulating pump 3 via a reflux pipeline to form a closed-loop circulation path of "sewage tank-circulating pump 3-ejector 4-fluidized bed reactor 1-circulating pump 3".
[0038] When the system is working, the sewage in the sewage tank is pressurized by the circulating pump 3 and enters the ejector 4 cavity at high speed from the first inlet of the ejector 4; at the same time, the ozone gas generated by the ozone generator 2 enters from the second inlet of the ejector 4; under the action of the Venturi effect of the ejector 4, the high-speed water flow entrains the ozone gas, and the two are fully mixed in the ejector 4 to form an ozone-containing sewage mixture fluid, which is then transported to the inlet chamber 11 of the fluidized bed reactor 1 through the outlet of the ejector 4;
[0039] After the mixed fluid enters the fluidized bed reaction chamber 12 from the inlet tank 11, it first flows through the fluidization lift 13: the water flow above the fluidization lift 13 carries the solid particulate catalyst (such as metal-loaded activated carbon particles) upward, so that the catalyst particles are in a fluidized state (i.e. the particles are suspended and flow with the fluid), which reduces the pressure drop in the expansion zone of the catalyst bed; then, the mixed fluid enters the guide tube 14, which constrains the flow direction, so that the fluid maintains a stable upward flow velocity in the guide tube 14, enhances the collision and contact intensity between the catalyst particles and ozone and wastewater, and improves the mass transfer efficiency;
[0040] When the mixed fluid rises to the top of the guide tube 14, the wastewater after ozone oxidation enters the three-phase separator 15. Due to gravity, the catalyst particles separate from the treated wastewater and residual ozone gas. A portion of the wastewater and catalyst return to the bottom of the reaction chamber and re-enter the fluidized bed 13 and guide tube 14 for ozone treatment. A portion of the wastewater passes through the gas-liquid-solid three-phase separation. The gas enters the exhaust port 151 at the top of the three-phase separator 15 and is discharged. A portion of the water enters the settling zone 152 at the top of the three-phase separator 15. After settling, a portion of the treated wastewater enters the effluent tank 154 through the overflow weir 153 and is discharged through the drain outlet. The other portion flows back to the inlet of the circulating pump 3 through the return port 16 at the top of the settling zone 152 of the three-phase separator 15. After mixing with the newly entered wastewater, it re-enters the jet injector 4, forming a continuous cycle treatment process.
[0041] This invention effectively improves ozone utilization without increasing reactor height through structural optimization design. Specifically, the circulating pump 3 pumps sewage from the sewage tank into the first inlet of the ejector 4, where it mixes with ozone generated by the ozone generator 2 and is then fed into the inlet chamber 11 to form a "sewage-ozone" mixed fluid. After being dispersed by the fluidized bed reaction chamber 12 through the fluidized bed lifter 13 and the guide tube 14, the mixed fluid fully contacts and reacts with pollutants in the sewage. Part of the reacted fluid flows back to the inlet of the circulating pump 3 through the return port 16 at the top of the settling zone 152 of the three-phase separator 15, and re-enters the ejector 4 for circulation treatment. The above circulation path extends the flow path of the "sewage-ozone" mixed fluid in the reactor, thereby increasing the actual residence time of ozone in the reactor.
[0042] The jet injector 4 uses a high-speed water flow to entrain ozone, increasing the actual ozone dosage. Simultaneously, micro-nano bubbles are generated within the jet injector 4, significantly increasing the solubility of ozone in water. Furthermore, the bursting of these bubbles generates additional hydroxyl radicals, further enhancing the oxidation reaction. Ultimately, this improves ozone utilization while reducing ozone consumption. Additionally, the fluidized bed reactor 1's fluidized bed lifter 13 promotes turbulent flow of the wastewater-ozone mixture, and the guide tube 14 constrains the flow direction, enhancing the mass transfer of ozone from the gas phase to the liquid phase. The three-phase separator 15 effectively separates the gas, liquid, and solid phases, preventing the disorderly escape of ozone with the exhaust gas. This invention improves ozone utilization efficiency. The guide tube 14 adopts a catalyst fluidized bed riser 13 structure, which reduces the pressure drop in the expansion zone through the fluidized movement of catalyst particles, thereby reducing system operating energy consumption. At the same time, the fluidized catalyst is fully mixed with sewage and ozone, enhancing the three-phase contact strength and significantly improving the mass transfer efficiency of ozone from the gas phase to the liquid phase, avoiding mass transfer losses caused by uneven mixing in traditional structures. This invention replaces the traditional method of extending the time by increasing the reactor height with the design of a circulating flow path, achieving an extension of ozone residence time while keeping the reactor height unchanged. It is especially suitable for sewage treatment scenarios where the equipment installation height is limited.
[0043] In a preferred embodiment, the water inlet chamber 11 is provided with a water distributor 5, preferably a perforated plate. The perforated plate is horizontally arranged on the top of the water inlet chamber 11, and water distribution holes with a diameter of 2-5 mm are evenly opened on its surface to evenly distribute the wastewater mixed with ozone into the fluidized bed reaction chamber 12.
[0044] In a preferred embodiment, the three-phase separator 15 includes a bottom flared opening, a side settling zone 152, and a top exhaust structure. The flared opening is flared in shape, with a diameter larger than the outer diameter of the fluidized bed reaction chamber 12, and communicates with the top of the fluidized bed reaction chamber 12 to guide the fluid in the guide tube 14 smoothly into the settling zone 152. The settling zone 152 is arranged circumferentially around the outside of the guide tube 14, that is, the settling zone 152 is an annular space, with its inner side clearance-fitted to the outer wall of the guide tube 14, and its outer side clearance-fitted to the inner wall of the fluidized bed reaction chamber 12. A ring-shaped channel is formed, with an overflow weir 153 at its upper part. The overflow weir 153 is a horizontal ring-shaped baffle that is higher than the bottom of the settling zone 152. An outlet trough 154 is connected to the outside of the overflow weir 153. The outlet trough 154 is a trough that extends circumferentially along the outer wall of the reactor and is used to collect the purified wastewater. The top of the three-phase separator 15 is provided with an exhaust port 151, and the settling zone 152 is surrounded on the outside. The exhaust port 151 is connected to the tail gas collection chamber. The top of the tail gas collection chamber is provided with an exhaust pipe that can be connected to an ozone tail gas destruction device.
[0045] When the mixed fluid rises to the top of the guide tube 14, it enters the flared end of the three-phase separator 15. The flared end structure guides the fluid to diffuse smoothly, reducing the impact of sudden changes in flow rate on separation. It then enters the settling zone 152. In the settling zone 152, the denser catalyst particles gather towards the center due to gravity, sink to the top of the fluidization booster 13, and re-participate in fluidization. The treated purified water rises along the gap between the settling zone 152 and the guide tube 14, overflows at the overflow weir 153, and flows into the outlet tank 154, and is finally discharged from the system through the outlet tank 154. The unreacted ozone gas and a small amount of mist rise with the fluid to the top of the three-phase separator 15, enter the exhaust gas collection chamber through the exhaust port 151, and are finally discharged through the exhaust pipe.
[0046] In a preferred embodiment, the fluidized bed reaction chamber 12 is provided with a drain valve 6 at the bottom for periodically discharging the sludge deposited at the bottom.
[0047] In a preferred embodiment, the fluidized bed reaction chamber 12 is provided with a sampling port 7 on its side wall, preferably threaded and equipped with a sealing cap, for real-time collection of wastewater samples from the reaction chamber to test water quality; during the operation of this system, wastewater samples from the reaction chamber can be collected periodically through the sampling port 7 to test indicators such as COD and ammonia nitrogen, and to adjust the ozone dosage or the frequency of the circulation pump 3; the bottom drain valve 6 is opened periodically to discharge the sludge deposited at the bottom of the reaction chamber, ensuring the long-term stable operation of the system.
[0048] In a preferred embodiment, a filter 8 is also provided between the sewage tank and the inlet of the circulating pump 3, preferably a Y-type filter 8 with a filtration accuracy of 50-100 mesh, for preliminary filtration of suspended solids and particulate impurities in the sewage.
[0049] In a preferred embodiment, the bottom of the water outlet tank 154 is also provided with a drain valve 9, preferably a gate valve or a ball valve, for controlling the discharge flow rate of purified water.
[0050] As a preferred embodiment, the guide tube 14 is provided with a double helical stirring blade (not shown in the figure) arranged axially inside; preferably, the two helical blades are wound in opposite directions with a pitch of 80-120mm, and the blades are connected to the stirrer at the top of the reaction chamber through a connecting rod to enhance the fluid mixing in the guide tube 14.
[0051] In some embodiments, the double helical stirring blades are connected to the top of the reaction chamber via a connecting rod, eliminating the need for a stirrer. Fluid mixing is achieved by driving the double helical stirring blades to rotate through the pressurized water flow entering the guide tube 14.
[0052] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.
Claims
1. A high-efficiency wastewater treatment system, characterized in that, Includes fluidized bed reactor, ozone generator, circulating pump and jet injector; The fluidized bed reactor includes an inlet chamber and a fluidized bed reaction chamber connected sequentially from bottom to top; a fluidized bed riser, a flow guide tube, and a three-phase separator arranged coaxially from bottom to top in the fluidized bed reaction chamber; The ozone generator is used to produce ozone; The inlet of the circulating pump is connected to the sewage tank, and is used to pump sewage through the inlet chamber to the fluidized bed reaction chamber; The outlet of the circulating pump is connected to the first inlet of the jet injector, the outlet of the ozone generator is connected to the second inlet of the jet injector, and the outlet of the jet injector is connected to the water inlet chamber. The three-phase separator has a reflux port at the top of the settling zone, and the reflux port is connected to the inlet of the circulating pump.
2. The high-efficiency wastewater treatment system according to claim 1, characterized in that, The inlet chamber is also equipped with a water distributor, which is used to evenly distribute the wastewater mixed with ozone into the fluidized bed reaction chamber.
3. The high-efficiency wastewater treatment system according to claim 2, characterized in that, The water distributor is a perforated plate.
4. A high-efficiency wastewater treatment system according to any one of claims 1-3, characterized in that, The bottom of the three-phase separator is configured in the shape of a funnel, and the funnel is connected to the top of the fluidized bed reaction chamber; The three-phase separator is provided with an exhaust port at the top and a settling zone on its outer side, which is arranged circumferentially around the outside of the guide tube; an overflow weir is provided above the settling zone and a water outlet trough is provided on the outer side of the overflow weir to receive the purified water overflowing through the overflow weir.
5. The high-efficiency wastewater treatment system according to claim 4, characterized in that, The three-phase separator is provided with an exhaust gas collection chamber at the top, and an exhaust pipe is provided at the top of the exhaust gas collection chamber.
6. A high-efficiency wastewater treatment system according to any one of claims 1-3, characterized in that, The fluidized bed reaction chamber is equipped with a drain valve at the bottom for removing bottom sludge.
7. A high-efficiency wastewater treatment system according to any one of claims 1-3, characterized in that, The fluidized bed reaction chamber is also equipped with a sampling port.
8. A high-efficiency wastewater treatment system according to any one of claims 1-3, characterized in that, A filter is also provided between the sewage tank and the inlet of the circulating pump for preliminary filtration of the sewage.
9. A high-efficiency wastewater treatment system according to claim 4, characterized in that, The bottom of the water outlet tank is also equipped with a drain valve.
10. A high-efficiency wastewater treatment system according to any one of claims 1-3, characterized in that, The guide tube is also equipped with a double-helix stirring blade.