Fenton internal circulation reaction device

Abstract

This utility model relates to the field of organic wastewater treatment technology, specifically a Fenton internal circulation reaction device for organic wastewater treatment, including a Fenton reactor and an inlet dosing tank. The inlet dosing tank is inverted conical with a "D"-shaped cross-section. Its sidewalls are connected to a main inlet pipe and a dosing pipe, and its bottom is connected to a reactor inlet pipe, which contains movable blades. The reactor is cylindrical, with a zigzag outlet channel at the top, a zigzag swirling device in the middle, and an annular jet agitator at the bottom. This experimental device improves the efficiency of the Fenton oxidation reaction by swirling wastewater and chemicals, and achieves internal circulation through a circulating pump and an annular jet agitator, promoting further degradation of the organic wastewater. This utility model can effectively improve the efficiency of the Fenton oxidation reaction and save on chemical usage.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, specifically relating to a Fenton internal circulation reaction device. Background Technology

[0002] With the rapid development of my country's economy, water pollution has become increasingly serious, with a surge in the types and quantities of wastewater threatening ecological security and human health. Organic wastewater, especially high-concentration organic wastewater, has attracted widespread attention in the water treatment field due to its high concentration of organic matter and its difficulty in degradation. High-concentration organic wastewater typically originates from coking, pharmaceutical, printing and dyeing, petrochemical, aquaculture, and landfill leachate industries. This wastewater contains large amounts of organic matter such as carbohydrates, proteins, oils, and lignin, with COD exceeding 2000 mg / L. Organic wastewater is characterized by its complex water quality, difficulty in biodegradation, high concentration, and high toxicity, making it difficult to treat to the required standards using traditional biological methods. Micro-electrolysis technology and advanced oxidation technology, developed in the 1980s, can utilize highly reactive intermediates generated by physical and chemical processes such as light, sound, electricity, and magnetism to oxidize pollutants. They are characterized by wide applicability, fast reaction rates, and strong oxidation capabilities, offering significant advantages in treating highly toxic and difficult-to-degrade wastewater from papermaking, printing and dyeing, pesticide, pharmaceutical, and landfill leachate industries.

[0003] Fenton oxidation is one of many oxidation processes that utilizes Fenton's reagent, a combination of ferrous salts and hydrogen peroxide, to oxidize and degrade organic matter. Essentially, it involves the reaction of H₂O₂ with Fe... 2+ Under catalysis, highly reactive •OH is generated, which reacts with most organic matter to degrade it. Current Fenton reactors are mostly columnar towers, with mass transfer enhanced by air agitation. Due to the height of the tower, the air pressure required for agitation is high, resulting in high power consumption for reactor operation. Furthermore, the reactor effluent directly enters the next treatment facility, leading to increased Fe... 2+ The process is not fully utilized, increasing chemical consumption and sludge production. Therefore, the Fenton oxidation process generally suffers from high energy consumption and large chemical dosage in practical applications. Utility Model Content

[0004] The purpose of this invention is to provide a Fenton internal circulation reactor, which not only solves the problems of high power consumption, low reagent utilization, and slow reaction rate of traditional Fenton reactors.

[0005] The technical solution adopted in this utility model is a Fenton internal circulation reaction device, which consists of a water inlet and dosing device and a Fenton reactor.

[0006] The water inlet dosing device has an inverted conical structure. The side wall of the water inlet dosing tank is connected to the main water inlet pipe. The FeSO4 dosing pipe is connected to the main water inlet pipe. The bottom of the water inlet dosing tank is connected to the reactor inlet pipe. One side of the reactor inlet pipe is connected to the reactor, and the other side is equipped with an observation and detection port.

[0007] The reactor has a cylindrical structure. An outlet trough is located at the top of the reactor along the perimeter of the tank. A lifting, zigzag-shaped weir is installed inside the outlet trough, and a flow distribution plate is installed at the outlet of the weir. A swirl device, consisting of a rotating shaft and a number of zigzag-shaped blades, is installed in the middle of the reactor. A circular jet agitator is installed at the bottom of the reactor and is connected to the outlet pipe of the circulating pump. A main outlet pipe is connected to the side wall of the outlet trough, and a downward-facing circulating water pipe is located on one side of the main outlet pipe. The end of the circulating water pipe is connected to the circulating pump, and an observation port is provided on the side wall of the circulating pump's outlet pipe.

[0008] The feature of this utility model is that,

[0009] The FeSO4 dosing pipe is at a 45° angle to the main inlet pipe. The reactor inlet pipe is equipped with a number of movable blades, and an inspection port is provided on one side of the reactor inlet pipe.

[0010] An annular jet agitator is installed at the bottom of the reactor along the perimeter of the tank. The annular jet agitator is connected in sequence to the outlet pipe of the circulating pump and the circulating pump. The inlet of the annular jet agitator is equipped with a horizontally upward cleaning inspection port.

[0011] The annular jet agitator consists of an annular main pipe and several jet nozzles with inward-facing nozzles at an inclination angle of 60°.

[0012] The weir plate of the outlet channel is a liftable zigzag shape, and the outlet of the channel plate is equipped with a flow distribution plate.

[0013] The main outlet pipe is equipped with a circulating water pipe, which is connected to the circulating pump. The side wall of the circulating water pipe is connected to an H2O2 dosing pipe, and the angle between the H2O2 dosing pipe and the circulating outlet pipe is 45°. The middle of the circulating water pipe is equipped with water pipes with "narrow tube" shapes at both ends to increase the water flow velocity and improve the static pressure of the water flow. At the same time, vortices are generated at the outlet of the narrow tubes, which is conducive to mixing and improves the treatment effect.

[0014] The beneficial effects of this invention are as follows: A Fenton internal circulation fixed-bed reactor, through injection at a 45° angle via a dosing pipe, produces a fan-shaped spray; the main inlet pipe is tangential to the tank body, causing the water flow to rotate counterclockwise, coinciding with the Coriolis force in the Northern Hemisphere, which is beneficial for promoting uniform mixing of the drug solution; inspection ports are provided on the side walls of the reactor inlet pipe and the annular jet agitator inlet pipe for easy subsequent cleaning and drug concentration testing; multiple layers of movable blades are installed inside the reactor inlet pipe to stabilize the reactor inlet water flow rate and prevent backflow of water within the reactor. The reactor utilizes a series of methods to improve chemical utilization. By designing a zigzag-shaped fan blade, the water flow within the reactor is swirled, enhancing the efficiency of chemical reaction. A liftable zigzag weir plate in the effluent channel increases head pressure, aiding in better effluent balance regulation. Increased flow area creates multiple vortices and reflected waves at the weir plate's leading edge, promoting sediment deposition, blocking suspended solids, preventing filter media loss, and extending floc reaction time. A narrow-tube circulating water pipe further increases flow velocity and impacts the reactor bottom pressure. A circular jet agitator is also incorporated to facilitate the mixing of H2O2 with wastewater and Fe. 2+ Thorough mixing can also prevent flocs from settling at the bottom of the reactor; through the inlet with a "D" shaped cross-section, the flow rate at different positions of the cross-section can be different, which can enhance the hydraulic shearing effect and improve the mixing effect of organic wastewater and FeSO4.

[0015] This invention can effectively improve the Fe content in the Fenton oxidation reaction. 2+ It improves utilization efficiency and has advantages such as saving FeSO4 and H2O2 usage and reducing wastewater treatment costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the Fenton reactor of this utility model;

[0017] Figure 2 This is a top view of the Fenton reactor of this utility model;

[0018] Figure 3 This is a schematic diagram of the annular jet stirring device in the Fenton reactor of this utility model;

[0019] Figure 4 This is a schematic diagram of the broken-line weir plate in the Fenton reactor of this utility model.

[0020] In the diagram, 1. Inlet water and chemical dosing tank, 2. Reactor, 3. Inlet main pipe, 4. FeSO4 dosing pipe, 5. Reactor inlet pipe, 6. Movable blades, 7. Observation port a, 8. Zigzag vortex device, 9. Outlet tank, 10. Annular jet agitator, 11. Flow distribution plate, 12. Circulating water pipe, 13. Outlet main pipe, 14. Circulating pump, 15. Circulating pump outlet pipe, 16. Observation port b, 17. H2O2 dosing pipe, 18. Annular main pipe, 19. Jet injector, 20. Ball valve, 21. Zigzag weir plate, 22. Narrow tube. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0022] like Figure 1 and Figure 2 As shown, a circulating fluidized bed Fenton reactor for organic wastewater includes an inlet dosing tank 1 and a reactor 2. The inlet dosing tank 1 has an inverted conical structure with a "D"-shaped cross-section. The sidewall of the inlet dosing tank 1 is connected to an inlet main pipe 3 and a FeSO4 dosing pipe 4. The bottom of the inlet dosing device 1 is connected to a reactor inlet pipe 5. The reactor inlet pipe 5 contains multiple layers of movable blades 6. The sidewall of the reactor inlet pipe 5 is connected to an observation port a 7. A ball valve 20 is provided between the reactor inlet pipe 5 and the reactor 7; the reactor 2 is a cylindrical structure, and a zigzag vortex device 8 is installed in the middle of the reactor 2. A circular jet stirring device 10 is provided at the bottom of the reactor 2. The circular jet stirring device 10 is connected in sequence to the circulating pump outlet pipe 15, the circulating pump 14 and the circulating water pipe 12. An outlet trough 9 is provided along the periphery of the tank at the top of the reactor. A flow distribution plate 11 and a zigzag weir plate 21 are provided on the outlet trough 9. The outlet trough 9 is connected to the main outlet pipe 13. The side wall of the main outlet pipe 13 is connected to the circulating water pipe 12. A narrow tube 22 is provided in the middle of the circulating water pipe 12.

[0023] like Figure 3 As shown, the annular jet stirring device 10 consists of an annular main pipe 18 and several jet injectors 19 with nozzles facing the inside of the reactor.

[0024] The working principle of this invention is as follows: FeSO4 solution enters the main inlet pipe 3 through FeSO4 dosing pipe 4, mixes with wastewater in the main inlet pipe 3, and enters the inlet dosing tank 1. After swirling mixing, it is fully mixed under the action of water flow shear force and static pressure, and enters reactor 2 through reactor inlet pipe 5. The movable blades 6 inside reactor inlet pipe 5 prevent wastewater backflow. The ball valve 20 controls the wastewater to enter the observation and detection port a 7 for pipe cleaning and detection of solution uniformity. After entering reactor 2, the wastewater impacts the zigzag vortex device 8, causing the water flow to rotate counterclockwise, matching the Coriolis force in the Northern Hemisphere, promoting the reaction and reducing precipitation. The wastewater in reactor 2 overflows to the zigzag weir plate 21 and the distribution plate 11, and is collected in the outlet tank 9. The overflow wastewater enters the outlet main pipe 13 for discharge, and part of the wastewater enters the circulating water pipe 12. The H2O2 solution enters the circulating water pipe 12 through H2O2 dosing pipe 17 and mixes with the wastewater. The water mixing process involves a narrow tube structure 22 in the middle of the circulating water pipe. When wastewater flows from the large-diameter pipe into the small-diameter pipe, the water flow cannot accumulate in large quantities, thus accelerating through the channel, increasing the flow velocity and pressure. Simultaneously, a vortex is generated at the outlet of the narrow tube, promoting mixing of the chemical solution and wastewater. The mixed wastewater is then sent to the annular jet stirring device 10 at the bottom of the reactor 2 via the circulating pump 14 and the circulating pump outlet pipe 15. It is then ejected through the ejector 19 of the annular jet stirring device 10, where H2O2 and Fe... 2+ The circulating pump further mixes the chemicals, improves the utilization rate of the chemicals, increases the water flow pressure, and impacts the sediment deposited at the bottom of reactor 2, so that the wastewater oxidation reaction proceeds evenly. The pipe is cleaned and the degree of chemical mixing and the concentration of suspended solids are detected through the observation and inspection port b 16 on the side wall of the circulating pump outlet pipe 15, thereby controlling the flow rate and concentration of the circulating water.

[0025] Throughout the process, the organic matter in the organic wastewater is oxidized and degraded by •OH in the reactor. After the unreacted substances in the circulating water pipe are mixed with H2O2, they are pumped to the annular jet stirring device to increase the reaction time and promote the uniform and effective oxidation reaction of the organic wastewater. This process has the advantages of saving FeSO4 and reducing sludge production.

Claims

1. A Fenton internal circulation reaction apparatus, characterized in that: Includes the Fenton reactor and the influent dosing tank; The water inlet dosing tank is an inverted cone shape with a "D" shaped cross-section. Its side wall is connected to the main water inlet pipe. The FeSO4 dosing pipe is fixed to the main water inlet pipe at a 45° angle. Its bottom is connected to the reactor water inlet pipe. An inspection port is provided on the other side of the reactor water inlet pipe. A ball valve is installed inside the inspection port. Movable blades are installed inside the cone-shaped structure of the water inlet dosing tank. The reactor is cylindrical, with an outlet trough along the perimeter of the upper part of the reactor wall. A lifting, zigzag-shaped trough plate is installed on the inner side plate of the outlet trough, and a flow distribution plate is installed at the outlet of the trough plate. A swirl device is installed in the middle of the reactor, consisting of a rotating shaft and a certain number of zigzag-shaped fan blades. A circular jet agitator is installed at the bottom, with a number of inclined jets installed in the inner ring of the circular jet agitator. The outer wall of the outlet trough is connected to an outlet main pipe, one side of which is connected to a circulating water pipe. The upper side wall of the circulating water pipe is connected to an H2O2 dosing pipe. The middle part of the circulating water pipe is designed as a narrow tube structure. The circulating pump is connected to the end of the circulating water pipe and the outlet pipe of the circulating pump. An observation and detection port is provided on the side wall of the outlet pipe of the circulating pump, and the outlet pipe of the circulating pump is connected to the circular jet agitator.

2. The Fenton internal circulation reactor according to claim 1, characterized in that: The dosing tube is inclined at 45° to inject into the water inlet pipe, creating a fan-shaped spray pattern with the widest coverage, promoting uniform mixing of the drug solution.

3. The Fenton internal circulation reactor according to claim 1, characterized in that: The main water inlet pipe is tangent to the tank body, giving the fluid in the tank the potential energy to rotate counterclockwise, promoting uniform mixing of the medicine.

4. The Fenton internal circulation reactor according to claim 1, characterized in that: The reactor is connected to a reactor inlet pipe on its side wall. The reactor inlet pipe is equipped with movable blades to ensure that the water flows in one direction without backflow. The side wall of the reactor inlet pipe is equipped with an inspection port to facilitate subsequent cleaning and testing to ensure that the medicines are mixed evenly.

5. The Fenton internal circulation reactor according to claim 1, characterized in that: The inlet dosing tank has a "D" shaped cross-section. By varying the flow velocity at different locations along the cross-section, the hydraulic shearing effect is enhanced, thereby improving the mixing effect of organic wastewater and FeSO4.

6. The Fenton internal circulation reactor according to claim 1, characterized in that: The reactor is equipped with a certain number of zigzag fan blades in the middle. These zigzag fan blades can generate a large and stable swirling flow in a limited space and at a low speed, which promotes drug mixing and accelerates the reaction.

7. The Fenton internal circulation reactor according to claim 1, characterized in that: The bottom of the reactor is equipped with a circular jet stirring device, which is connected in sequence to a circulating pump outlet pipe and a circulating pump.

8. The Fenton internal circulation reactor according to claim 1, characterized in that: The annular jet stirring device consists of an annular main pipe and several injectors. The injectors are tilted at an angle of 60°, causing the liquid in the reactor to rotate counterclockwise. An inspection port with an upward opening is provided above the water inlet pipe of the annular main pipe.

9. The Fenton internal circulation reactor according to claim 1, characterized in that: The aforementioned lifting-type zigzag trough plate is a weir plate structure. At the same time, the outlet of the trough plate is equipped with a flow distribution plate to achieve uniform water distribution, prevent disturbance of the outflow, adjust the water flow rate, increase the flow area, and make the water flow form multiple vortices and reflected waves at the front edge of the weir plate, which is beneficial to blocking suspended matter and prolonging the floc reaction time.

10. The Fenton internal circulation reactor according to claim 1, characterized in that: The circulating water pipe is connected to the annular jet stirring device through a circulating pump and a circulating pump outlet pipe. The middle part of the circulating water pipe has a "narrow tube" structure, which can increase the water flow velocity and water flow pressure, and promote the uniform mixing of wastewater and medicine solution.

Images