Hydrate method sewage treatment device and treatment method

Abstract

The present application relates to sewage treatment technical field, especially to a kind of hydrate method sewage treatment device and processing method.Its technical scheme includes: water turbine mechanism, including folding cylinder, spiral groove, sewage pipe and carbon dioxide pipe, the inside of folding cylinder is opened spiral groove, the sewage pipe is through folding cylinder, the end of sewage pipe is adopted spiral shape, the sewage pipe is attached to the inner wall of folding cylinder and is embedded at spiral groove, the carbon dioxide pipe is equipped with multiple and is annularly distributed around stirring paddle.The present application utilizes the speed of sewage into folding cylinder, the end spiral shape structure of sewage pipe and spiral groove, so that sewage is spirally rotated along the inner wall of spiral groove, subsequent folding cylinder is added with sewage, and the sewage added subsequently will directly form vortex in folding cylinder, reduce the difference between sewage vortex rotation speed and stirring paddle speed, avoid that the difference between rotation speed is too large to cause that stirring paddle is hit to sewage to make that carbon dioxide dissolved in sewage overflow from sewage.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a wastewater treatment device and method using hydrates. Background Technology

[0002] Corrosion or abrasion products on the surface of structural materials in the fusion reactor coolant system are carried by the coolant to the reactor core or neutron irradiation area, where they are activated by neutron bombardment. Alternatively, materials in the reactor core or neutron irradiation area are first activated by neutron bombardment, and then oxidized and corroded during contact with the coolant, thus forming activated corrosion products in the main loop. In water-cooled fusion reactors, activated corrosion products mainly originate from the physical and chemical interactions between water and stainless steel, producing primarily Cr-51, Mn-54, Mn-56, Fe-55, Ni-58, Co-57, Co-58, and Co-60. Furthermore, copper alloys in the tungsten components of the divertor, when activated by neutrons, will also produce Cu-64, Co-60, Ni-63, Zn-65, Co-58, and Fe-59.

[0003] The activated corrosion products produce hundreds of radioactive nuclides with half-lives ranging from hours to over a hundred years. These activated corrosion products, deposited on the tube walls or in the coolant, continuously decay and release gamma rays, becoming a major source of dose rate contribution during both normal operation and shutdown of the fusion reactor. According to data from a French pressurized water reactor nuclear power plant, in a reactor environment under normal steady-state operation, the collective dose to the reactor core caused by activated corrosion products in the coolant system accounts for over 90%. Therefore, the longer a fusion reactor operates, the greater the dose rate of the radiation field will be. Furthermore, the dose rate will increase significantly in cases of significant migration of activated corrosion products or accidental contamination.

[0004] In addition, when the coolant flows through the core irradiation zone, radioactive activation products are generated under neutron irradiation. The main nuclides considered are N-16, N-17, H-3, and C-14. N-16 and N-17 originate from the neutron activation of the coolant's inherent nuclides O-16 and O-17, respectively; H-3 mainly originates from the neutron activation of boron and lithium added to the coolant; C-14 mainly originates from the neutron activation of O-17, N-14, and C-13 in the coolant. N-16 has a half-life of 7.14 s, with each decay emitting an average of 0.01 photons at 2.75 MeV, 0.69 photons at 6.13 MeV, and 0.05 photons at 7.10 MeV; N-17 has a half-life of 4.10 s, with each decay emitting one neutron at 0.90 MeV. N-16 and N-17 are present in large quantities during reactor operation. Their decay releases high-energy gamma rays, and once the reactor stops operating, their activity concentrations decrease to 1 / 300 and 1 / 2000 of their initial concentration within one minute. While H-3 and C-14 have long half-lives, they are low-energy beta emitters and will not cause external radiation damage to workers. Therefore, the radioactivity resulting from the activation of the coolant itself after reactor shutdown accounts for a very small proportion of the total radioactivity in the fusion reactor's primary circuit, and the radiation exposure risk is essentially negligible.

[0005] In summary, activated corrosion products are the most critical radioactive source terms in radiation safety analysis under normal operating conditions of fusion reactors. Activated corrosion products deposited on pipe walls and in the coolant can increase radiation dose rate during circulation in the loop, posing a significant safety hazard. Therefore, developing primary coolant purification technology for fusion reactors has become a crucial task for the safe operation of fusion reactors, as contaminated coolant forms wastewater.

[0006] Hydrate technology is used to develop coolant purification technology, a method of purifying wastewater by extracting it with hydrates. Based on the property that a solvent has different solubilities for different substances, certain pollutants dissolved in wastewater can be completely or partially separated. Adding a solvent that is insoluble or sparingly soluble in water (the extractant) to the wastewater causes certain pollutants dissolved in the wastewater (the extractable) to transfer into the extractant at the interface between the two liquid phases, thus purifying the wastewater. Agitator blades are used to stir the wastewater, accelerating the dissolution of carbon dioxide.

[0007] The rotation of the agitator blades causes the wastewater to rotate, but as more wastewater is added, the rotation speed of the wastewater decreases, and the difference between the rotation speed of the agitator blades and the rotation speed of the wastewater increases. The agitator blades will then slap the wastewater, causing it to surge. This surging of the wastewater will cause dissolved carbon dioxide to overflow from the wastewater, slowing down the rate at which carbon dioxide dissolves in the water. Summary of the Invention

[0008] The purpose of this invention is to address the problem in the prior art where dissolved carbon dioxide overflows due to the churning of wastewater during stirring, and to propose a hydrate-based wastewater treatment device and method.

[0009] The technical solution of the present invention: a hydrate-based wastewater treatment device, comprising:

[0010] The reactor has a stirring paddle rotatably connected to the top center, a top frame for supporting the stirring paddle is fixedly installed on the top of the reactor, and symmetrically arranged mounting pipes are fixedly installed on the sides of the reactor.

[0011] The water vortex mechanism includes a folding cylinder, a spiral groove, a sewage pipe, and a carbon dioxide pipe. The spiral groove is opened inside the folding cylinder. The sewage pipe passes through the folding cylinder and the end of the sewage pipe is spiral-shaped. The sewage pipe is attached to the inner wall of the folding cylinder and embedded in the spiral groove. Multiple carbon dioxide pipes are provided and distributed in a ring around the stirring paddle. Carbon dioxide gas flows inside the carbon dioxide pipe.

[0012] The folded cylinder forms a hydration zone, sewage flows through the sewage pipe, the stirring paddle is located at the center of the folded cylinder, a separation zone is formed between the folded cylinder and the reactor, a base platform is fixedly installed at the bottom of the folded cylinder, the bottom of the base platform is fixedly connected to the reactor, and the end of the carbon dioxide pipe is fixedly connected to the reactor.

[0013] The top of the water vortex mechanism is provided with a folding mechanism, and the inside of the top frame and located on the side of the stirring paddle is provided with a lubrication mechanism.

[0014] Optionally, the wastewater is discharged from the wastewater pipe in a spiral shape along the pipe. The spiral direction of the wastewater is the same as the rotation direction of the agitator. The rotation speed of the agitator is the same as the speed at which the wastewater flows out of the wastewater pipe. The end of the carbon dioxide pipe has a wavy structure. The position of the carbon dioxide pipe is offset from that of the agitator. Multiple vent holes are provided on the carbon dioxide pipe. All vent holes on the same carbon dioxide pipe are on the same plane. The outlet direction of the vent holes is the same as the spiral direction of the wastewater.

[0015] Optionally, a sleeve is fixedly installed at the top opening of the folded cylinder. The sleeve has a hollow frustum-shaped structure, and the bottom of the sleeve is fixedly connected to the base platform. A storage tank is formed between the base platform and the reactor to collect the sewage overflowing from the opening of the folded cylinder.

[0016] Optionally, a discharge pipe is fixedly installed at the center of the base, a one-way valve is fixedly installed at one end of the discharge pipe, and a filtration flask and a vacuum pump are fixedly installed at the other end of the discharge pipe.

[0017] Optionally, the folding mechanism includes a slide rod, a limiting ring, a slider, a linkage rod, a lower sliding ring, and a plate. Multiple slide rods are arranged in an equal-angle ring on the shaft of the stirring paddle. The ends of the slide rods are fixedly connected to the limiting rings. The outer wall of the slide rods is slidably connected to the slider. The slider is elastically connected to the stirring paddle via a return spring. Both the upper and lower sides of the slider are hinged to the linkage rods. The end of the linkage rod on the lower side of the slider is hinged to the lower sliding ring. The plate is embedded in the middle of the lower sliding ring. The side of the plate away from the lower sliding ring is fixedly connected to the folding cylinder. The spiral groove serves as the folding pattern of the folding cylinder.

[0018] Optionally, the lower sliding ring has an annular groove in the middle, and a ball bearing is rolled on the bottom of the plate. The ball bearing rolls in the annular groove of the lower sliding ring. The lower sliding ring rotates synchronously with the agitator and slides on the shaft of the agitator. A telescopic rod is fixedly installed on the top of the plate, and the end of the telescopic rod is fixedly connected to the reactor.

[0019] Optionally, the lubrication mechanism includes a gravity rod, a piston, an injection tube, and a lubricating oil tank. The end of the gravity rod is fixedly connected to the piston, the bottom of the lubricating oil tank is fixedly connected to the top frame, the side of the lubricating oil tank is connected to the injection tube through a stainless steel tube, the piston slides inside the injection tube, and the stirring paddle is rotatably connected to the top frame through a bearing located on the extension line of the injection tube.

[0020] Optionally, a ball bearing is slidably connected to the end of the gravity rod, and an upper sliding ring is hinged to the linkage rod on the upper side of the slider. The ball bearing rolls on the top of the upper sliding ring. A nozzle is connected to the end of the injection tube. The diameter of the nozzle is the same as the diameter of the bearing. Multiple openings are provided on the nozzle, and the openings face the ball bearing inside.

[0021] Optionally, the stirring paddle is fixedly connected to the motor via a rotating shaft, and a light source and a camera are fixedly installed in the two mounting tubes respectively. The light source and camera are both tilted, the folding cylinder is located on the extension line of the light source and camera, and a mounting base is fixedly installed at the bottom of the reactor.

[0022] A hydrate-based wastewater treatment method, applied to the aforementioned hydrate-based wastewater treatment device, includes the following steps:

[0023] S1. Filling with wastewater: First, the reactor is thoroughly cleaned and dried. Wastewater with a concentration that matches the activation corrosion of the fusion reactor coolant is prepared, poured into the reactor, and sealed at a temperature of 288.2K.

[0024] S2. Inject carbon dioxide and increase the pressure: Inject carbon dioxide gas into the reactor and pressurize it to a certain pressure. Stabilize the reactor at a sealed temperature for 30 minutes. In this step, the precise amount of carbon dioxide injected into the reactor is determined.

[0025] S3. Increase the contact area between carbon dioxide and water: Under sealed temperature, the agitator continuously stirs at a rate of 600 rpm for 60 minutes. The vortex formed by the sewage entering the folded cylinder has a certain rotation speed. The rotation of the agitator maintains the rotation speed of the vortex. The difference between the rotation speed of the agitator and the rotation speed of the vortex is small.

[0026] S4. Formation of hydrates: Carbon dioxide hydrates are induced by cooling the reactor to 275.2K at a rate of 6.0K / h. The formation of hydrates is achieved through a sudden temperature fracture followed by a drop in gas pressure. The hydrate particles are observed through a camera. The hydrates and heavy metals form hydrate precipitates and separate into layers with the wastewater. The speed of the agitator is reduced, and the folding cylinder is folded to discharge the upper layer of wastewater that does not contain heavy metals, thereby reducing the amount of hydrate precipitates and wastewater mixture extracted and accelerating the extraction speed.

[0027] S5. Separation of hydrates and wastewater: The hydrate precipitate and unreacted wastewater after the reaction are separated into solid and liquid components. Vacuum filtration is performed at room temperature for 30 seconds to obtain hydrate precipitate and residual wastewater. The hydrate precipitate is centrifuged at -5℃ and 4000r / min for 3 minutes to further remove the salt solution inside the hydrate precipitate and the salt remaining on the surface of the hydrate precipitate. After centrifugation, the hydrate precipitate is placed at room temperature to allow it to decompose on its own to obtain pure water.

[0028] Compared with the prior art, the present invention has the following beneficial technical effects:

[0029] This invention utilizes the speed at which wastewater enters the folded cylinder, combined with the spiral structure and spiral groove at the end of the wastewater pipe, to make the wastewater spirally rotate along the inner wall of the spiral groove. When wastewater is added to the folded cylinder later, the added wastewater will directly form a vortex in the folded cylinder, reducing the difference between the rotation speed of the wastewater vortex and the rotation speed of the agitator, and avoiding the agitator from hitting the wastewater due to an excessive difference in rotation speed, causing the carbon dioxide that has been dissolved in the wastewater to overflow.

[0030] Furthermore, the stirring paddle changes from a stationary state to a rotating state, using centrifugal force to move the slider away from the stirring paddle and using the linkage rod, sliding ring and plate to raise the height of the folding cylinder, preventing the sewage from overflowing due to the rising liquid level during stirring or splashing out when the stirring paddle hits the sewage.

[0031] Furthermore, after the agitator finishes stirring, carbon dioxide dissolves in water to extract heavy metals and produce precipitates, reducing the height of the top of the folded cylinder. The precipitates and water are separated into layers for initial separation. Water overflows from the top of the folded cylinder and flows into the separation zone. Its own temperature is used as a water bath to control the temperature of the wastewater inside the folded cylinder. At the same time, direct discharge of water avoids taking away heat and carbon dioxide from the reactor, thereby maintaining the temperature and pressure environment for subsequent wastewater treatment.

[0032] Furthermore, when the agitator enters a static state after stirring the wastewater for a long time, the piston squeezes out the lubricating oil from the lubrication tank and injection tube, and the nozzle expands its coverage area to better lubricate the bearings, avoid wear caused by prolonged operation of the agitator, and prevent the agitator from rotating at the required speed, which would reduce the rate at which carbon dioxide dissolves in the wastewater. Attached Figure Description

[0033] Figure 1 A schematic diagram of the overall structure proposed in this invention is provided;

[0034] Figure 2 A schematic cross-sectional view of a reactor according to an embodiment of the present invention is provided;

[0035] Figure 3 A schematic diagram of a linkage structure according to an embodiment of the present invention is provided;

[0036] Figure 4 Give Figure 3 Enlarged schematic diagram of the slider structure in part A;

[0037] Figure 5 A front sectional view of a folding tube structure according to an embodiment of the present invention is provided;

[0038] Figure 6 A schematic diagram of a folding tube structure according to an embodiment of the present invention is provided;

[0039] Figure 7 A schematic front sectional view of the reactor structure according to an embodiment of the present invention is provided;

[0040] Figure 8 A schematic diagram of a bearing structure according to an embodiment of the present invention is provided;

[0041] Figure 9 A front sectional view of the injection tube structure according to an embodiment of the present invention is provided.

[0042] Reference numerals: 1. Mounting base; 2. Reactor; 3. Mounting pipe; 4. Top frame; 5. Water swirl mechanism; 51. Folding cylinder; 52. Spiral groove; 53. Sewage pipe; 54. Carbon dioxide pipe; 55. Exhaust port; 56. Sleeve; 57. Base platform; 58. Discharge pipe; 6. Agitator; 7. Folding mechanism; 71. Sliding rod; 72. Limiting ring; 73. Sliding block; 74. Linkage rod; 75. Lower sliding ring; 76. Panel; 77. Telescopic rod; 78. Return spring; 79. Upper sliding ring; 8. Lubrication mechanism; 81. Gravity rod; 82. Ball bearing; 83. Piston; 84. Injection tube; 85. Nozzle; 86. Lubricating oil tank; 9. Bearing. Detailed Implementation

[0043] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0044] Example 1

[0045] This embodiment proposes a hydrate-based wastewater treatment device, such as... Figure 1-6 As shown, the reactor includes a reactor 2, with a stirring paddle 6 rotatably connected to the top center. Inside the reactor 2 is a water vortex mechanism 5, which includes a folded cylinder 51, a spiral groove 52, a wastewater pipe 53, and carbon dioxide pipes 54. The spiral groove 52 is formed inside the folded cylinder 51. The wastewater pipe 53 passes through the folded cylinder 51, and wastewater flows through it. The end of the wastewater pipe 53 is spiral-shaped and rests against the inner wall of the folded cylinder 51, embedded in the spiral groove 52. Multiple carbon dioxide pipes 54 are arranged in a ring around the stirring paddle 6, and carbon dioxide gas flows through them. By introducing carbon dioxide, the gas pressure inside the reactor 2 is increased, and the carbon dioxide concentration is increased to increase the amount of carbon dioxide dissolved in water. Multiple carbon dioxide pipes 54 are used to increase the amount of carbon dioxide and wastewater dissolved.

[0046] Wastewater is discharged from wastewater pipe 53 and spirals upwards along it. The spiral direction of the wastewater is the same as the rotation direction of the agitator 6. The rotation speed of the agitator 6 is the same as the speed at which the wastewater flows out of wastewater pipe 53. The end of the carbon dioxide pipe 54 has a wavy structure, and its position is staggered from that of the agitator 6. Multiple carbon dioxide pipes 54 are used to introduce carbon dioxide to increase the contact area between carbon dioxide and wastewater, thereby increasing the efficiency of carbon dioxide dissolving in wastewater.

[0047] like Figure 5As shown, after the sewage enters the folded cylinder 51 from the sewage pipe 53, since the sewage pipe 53 is attached to the inner wall of the folded cylinder 51 and embedded in the spiral groove 52, the sewage flowing out of the sewage pipe 53 has a jetting speed, causing the sewage to move spirally along the spiral groove 52. After entering the folded cylinder 51, the sewage begins to rotate inside the folded cylinder 51. As the amount of sewage increases, the sewage will form a vortex inside the folded cylinder 51. At the same time, the stirring paddle 6 stirs the sewage. The rotation speed of the stirring paddle 6 is the same as the sewage discharge speed, so that the stirring paddle 6 and the sewage are relatively stationary. This avoids the relative speed between the stirring paddle 6 and the sewage being too large, which would cause the stirring paddle 6 to slap the sewage while stirring, causing the dissolved carbon dioxide in the sewage to overflow from the water.

[0048] Multiple vent holes 55 are provided on the carbon dioxide pipe 54. All vent holes 55 on the same carbon dioxide pipe 54 are on the same plane. The outlet direction of the vent holes 55 is the same as the spiral direction of the sewage, so as to avoid the carbon dioxide and the sewage vortex rotating in opposite directions and generating bubbles that carry out the carbon dioxide dissolved in the sewage.

[0049] like Figure 2 As shown, the folded cylinder 51 forms a hydration zone, the stirring paddle 6 is located at the center of the folded cylinder 51, a separation zone is formed between the folded cylinder 51 and the reactor 2, a base platform 57 is fixedly installed at the bottom of the folded cylinder 51, the bottom of the base platform 57 is fixedly connected to the reactor 2, and the end of the carbon dioxide pipe 54 is fixedly connected to the reactor 2.

[0050] like Figure 2 As shown, a folding mechanism 7 is provided on the top of the water vortex mechanism 5, and a lubrication mechanism 8 is provided inside the top frame 4 and on the side of the stirring paddle 6.

[0051] like Figure 5 and 6 As shown, a sleeve 56 is fixedly installed at the top opening of the folded cylinder 51. The sleeve 56 adopts a hollow frustum-shaped structure. The bottom of the sleeve 56 is fixedly connected to the base 57. The base 57 and the reactor 2 form a storage tank to collect the sewage overflowing from the opening of the folded cylinder 51.

[0052] A discharge pipe 58 is fixedly installed at the center of the base 57. A one-way valve is fixedly installed at one end of the discharge pipe 58, and a filtration flask and a vacuum pump are fixedly installed at the other end of the discharge pipe 58. After carbon dioxide dissolves in the wastewater, it forms hydrates that react with heavy metals in the wastewater to form salts. Solid-liquid separation is then performed using the filtration flask and vacuum pump.

[0053] A top frame 4 supporting the stirring paddle 6 is fixedly installed on the top of the reactor 2. Symmetrically arranged mounting pipes 3 are fixedly installed on the side of the reactor 2. The stirring paddle 6 is fixedly connected to the motor through a rotating shaft. A light source and a camera are fixedly installed in the two mounting pipes 3 respectively. The light source and the camera are both set at an angle. The folding cylinder 51 is located on the extension line of the light source and the camera. The light source illuminates the sewage, and the camera observes the particles in the sewage. A mounting base 1 is fixedly installed at the bottom of the reactor 2.

[0054] In this embodiment, the speed at which sewage enters the folded cylinder 51 is utilized, and the spiral structure at the end of the sewage pipe 53 is attached to the inner wall of the folded cylinder 51 and embedded in the spiral groove 52. This causes the sewage flowing out of the sewage pipe 53 to spirally rotate along the inner wall of the spiral groove 52. As sewage accumulates in the folded cylinder 51, the sewage in the folded cylinder 51 will form a vortex, reducing the difference between the rotation speed of the sewage vortex and the rotation speed of the stirring paddle 6. This prevents the difference between the rotation speed of the stirring paddle 6 and the sewage vortex from being too large. When stirring the sewage, the stirring paddle 6 will slap the sewage, causing the carbon dioxide that has been dissolved in the sewage to overflow from the sewage.

[0055] Example 2

[0056] Based on Example 1, such as Figure 3 and 4 As shown, the folding mechanism 7 includes a slide rod 71, a limiting ring 72, a slider 73, a linkage rod 74, a lower sliding ring 75, and a plate 76. The slide rod 71 has multiple slide rods that are evenly distributed in a ring on the shaft of the stirring paddle 6. The end of the slide rod 71 is fixedly connected to the limiting ring 72. The outer wall of the slide rod 71 is slidably connected to the slider 73. The slider 73 is elastically connected to the stirring paddle 6 through a return spring 78. The upper and lower sides of the slider 73 are hinged to the linkage rod 74. The end of the linkage rod 74 on the lower side of the slider 73 is hinged to the lower sliding ring 75. The plate 76 is embedded in the middle of the lower sliding ring 75. The side of the plate 76 away from the lower sliding ring 75 is fixedly connected to the folding cylinder 51. The spiral groove 52 serves as the folding pattern of the folding cylinder 51.

[0057] When the agitator 6 rotates and agitates the sewage, the sewage is stirred and adheres to the rotating folded cylinder 51, causing the sewage height to exceed its static height. During the agitation process, the agitator 6 uses the slide rod 71 to drive the slider 73 to rotate. As the agitator 6 moves from a stationary state to a rotating state, the rotational speed of the slider 73 increases, meaning it experiences increased centrifugal force. The slider 73 moves away from the agitator 6, stretching the return spring 78. The slide rod 71 prevents the slider 73 from moving excessively and detaching from it. The movement of the slider 73 uses the linkage rod 74 to pull the lower sliding ring 75, which pulls the insert plate 76 upward, thus changing the folded cylinder 51 from a folded state to an extended state, preventing sewage from overflowing or splashing out of the folded cylinder 51. The return spring 78 resets the slider 73 when the rotational speed of the agitator 6 decreases.

[0058] like Figure 7 As shown, an annular groove is formed in the middle of the sliding ring 75, and a ball bearing is rolled on the bottom of the plate 76. The ball bearing rolls within the annular groove of the sliding ring 75, and the sliding ring 75 rotates synchronously with the agitator 6. The ball bearing reduces the friction between the sliding ring 75 and the plate 76. The sliding ring 75 slides on the shaft of the agitator 6, and a telescopic rod 77 is fixedly installed on the top of the plate 76. The end of the telescopic rod 77 is fixedly connected to the reactor 2, and the telescopic rod 77 guides the movement direction of the agitator 6.

[0059] In this embodiment, the stirring paddle 6 changes from a stationary state to a rotating state. The stirring paddle 6 drives the slider 73 to rotate using the slide bar 71. The slider 73 moves away from the stirring paddle 6. The slider 73 pulls the lower ring 75 using the linkage rod 74. The lower ring 75 uses the insert plate 76 to move the folded cylinder 51 upward. During stirring, the top height of the folded cylinder 51 is increased to prevent the sewage from overflowing due to the increased liquid level or splashing out when the stirring paddle 6 hits the sewage.

[0060] After the agitator 6 finishes stirring, carbon dioxide dissolves in water to form hydrates, extracting heavy metals from the wastewater to form salts and produce precipitates. The rotation speed of the agitator 6 decreases until it stops. At this time, the slider 73 is pulled back by the elastic force of the reset spring 78, so that the sliding ring 75 and the panel 76 are reset, and the top height of the folded cylinder 51 is reduced. Preliminary separation is achieved by using sedimentation and water stratification. Water overflows from the top of the folded cylinder 51 and flows into the separation zone. The water stays in the separation zone and uses its own temperature as a water bath to control the temperature of the wastewater in the folded cylinder 51. This avoids the water being directly discharged and taking away heat, which would affect the internal temperature of the reactor 2, and also avoids the carbon dioxide inside the reactor 2 being discharged, which would affect the existing pressure environment. The temperature and pressure environment are maintained for subsequent wastewater treatment.

[0061] Example 3

[0062] Based on the above embodiment 1 or 2, in this embodiment, as Figure 8 and 9 As shown, the lubrication mechanism 8 includes a gravity rod 81, a piston 83, an injection tube 84, and a lubricating oil tank 86. The end of the gravity rod 81 is fixedly connected to the piston 83, and the bottom of the lubricating oil tank 86 is fixedly connected to the top frame 4. The side of the lubricating oil tank 86 is connected to the injection tube 84 through a stainless steel tube. The piston 83 slides inside the injection tube 84. The stirring paddle 6 is rotatably connected to the top frame 4 through a bearing 9, which is located on the extension line of the injection tube 84. Lubricating oil is sprayed out through the injection tube 84 to lubricate the bearing 9. When the stirring paddle 6 rotates, it applies centrifugal force to the slider 73. The slider 73 pulls down the upper slip ring 79 using the linkage rod 74, and under the gravity of the gravity rod 81, it pulls the piston 83 down.

[0063] like Figure 8and 9 As shown, a ball bearing 82 is rolled at the end of the gravity rod 81. An upper sliding ring 79 is hinged to the linkage rod 74 on the upper side of the slider 73. The ball bearing 82 rolls on top of the upper sliding ring 79, reducing the friction between the upper sliding ring 79 and the gravity rod 81. A nozzle 85 is connected to the end of the injection tube 84. The diameter of the nozzle 85 is the same as the diameter of the bearing 9. Multiple openings are provided on the nozzle 85, facing the inner balls of the bearing 9. The nozzle 85 corresponds to the bearing 9 in position.

[0064] In this embodiment, when the agitator 6 enters a static state after stirring the sewage for a long time, the centrifugal force on the slider 73 decreases, and the slider 73 is pulled back to its original position by the reset spring 78. The upper slip ring 79 is pushed upward by the linkage rod 74, and the upper slip ring 79 pushes the piston 83 upward by the gravity rod 81. The piston 83 squeezes out the lubricating oil in the lubricating oil tank 86 and the injection tube 84, and the nozzle 85 expands its coverage area to better lubricate the bearing 9 and avoid wear caused by the agitator 6 running for a long time. The rotation speed of the agitator 6 does not reach the required speed, resulting in a decrease in the rate at which carbon dioxide dissolves in the sewage.

[0065] A hydrate-based wastewater treatment method, applied to the aforementioned hydrate-based wastewater treatment device, includes the following steps:

[0066] S1. Filling with wastewater: First, reactor 2 is thoroughly cleaned and dried. Wastewater with a concentration that matches the activated corrosive substances of the fusion reactor coolant is prepared, poured into reactor 2, and sealed at a temperature of 288.2K.

[0067] S2. Inject carbon dioxide and increase the pressure: Inject carbon dioxide gas into reactor 2 and pressurize it to a certain pressure. Stabilize the reactor at a sealed temperature for 30 minutes. In this step, the precise amount of carbon dioxide injected into the reactor is determined.

[0068] S3. Increase the contact area between carbon dioxide and water: Under sealed temperature, the stirring paddle 6 is continuously stirred at a rate of 600 rpm for 60 minutes. The vortex formed by the sewage entering the folded cylinder 51 has a certain rotation speed. The stirring paddle 6 rotates to maintain the rotation speed of the vortex. The difference between the rotation speed of the stirring paddle 6 and the rotation speed of the vortex is small. In this step, carbon dioxide gas dissolved in water is measured, and when the gas pressure and temperature are stable, the solubility and residual amount of carbon dioxide in the gas phase are measured.

[0069] S4. Formation of hydrates: Carbon dioxide hydrates are induced by cooling reactor 2 to 275.2K at a rate of 6.0K / h. The formation of hydrates is achieved through a sudden temperature fracture followed by a drop in gas pressure. The hydrate particles are observed through a camera. The hydrates and heavy metals form hydrate precipitates and separate into layers with the wastewater. The speed of the agitator 6 is reduced, and the folding cylinder 51 is folded to discharge the upper layer of wastewater that does not contain heavy metals, thereby reducing the amount of hydrate precipitates and wastewater mixture extracted and accelerating the extraction speed.

[0070] S5. Separation of hydrates and wastewater: The hydrate precipitate and unreacted wastewater after the reaction are separated into solid and liquid components. Vacuum filtration is performed at room temperature for 30 seconds to obtain the hydrate precipitate and residual wastewater. The hydrate precipitate is then centrifuged at -5℃ and 4000 r / min for 3 minutes to further remove the salt solution inside the hydrate precipitate and the salt remaining on its surface. After centrifugation, the hydrate precipitate is left to decompose at room temperature to obtain pure water. The conductivity of the decomposed water and the residual solution is measured using a conductivity meter.

[0071] The above specific embodiments are merely several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A wastewater treatment device using hydrates, characterized in that, include: The reactor (2) has a stirring paddle (6) rotatably connected to the top center of the reactor (2), a top frame (4) for supporting the stirring paddle (6) is fixedly installed on the top of the reactor (2), and symmetrically arranged mounting pipes (3) are fixedly installed on the side of the reactor (2). The water vortex mechanism (5) includes a folded cylinder (51), a spiral groove (52), a sewage pipe (53), and a carbon dioxide pipe (54). The spiral groove (52) is opened inside the folded cylinder (51). The sewage pipe (53) passes through the folded cylinder (51). The end of the sewage pipe (53) is spiral. The sewage pipe (53) is attached to the inner wall of the folded cylinder (51) and embedded in the spiral groove (52). Multiple carbon dioxide pipes (54) are provided and are distributed in a ring around the stirring paddle (6). Carbon dioxide gas flows inside the carbon dioxide pipe (54). The folded cylinder (51) forms a hydration zone, sewage flows through the sewage pipe (53), the stirring paddle (6) is located at the center of the folded cylinder (51), a separation zone is formed between the folded cylinder (51) and the reactor (2), a base platform (57) is fixedly installed at the bottom of the folded cylinder (51), the bottom of the base platform (57) is fixedly connected to the reactor (2), and the end of the carbon dioxide pipe (54) is fixedly connected to the reactor (2). The top of the water vortex mechanism (5) is provided with a folding mechanism (7), and the inside of the top frame (4) and the side of the stirring paddle (6) is provided with a lubrication mechanism (8). The folding mechanism (7) includes a slide rod (71), a limiting ring (72), a slider (73), a linkage rod (74), a lower sliding ring (75), and a panel (76). The slide rod (71) is provided with multiple rods and is distributed in an equal-angle ring on the shaft of the stirring paddle (6). The end of the slide rod (71) is fixedly connected to the limiting ring (72). The outer wall of the slide rod (71) is slidably connected to the slider (73). The slider (73) is elastically connected to the stirring paddle (6) through a return spring (78). The upper and lower sides of the slider (73) are hinged to the linkage rod (74). The end of the linkage rod (74) on the lower side of the slider (73) is hinged to the lower sliding ring (75). The panel (76) is embedded in the middle of the lower sliding ring (75). The side of the panel (76) away from the lower sliding ring (75) is fixedly connected to the folding cylinder (51). The spiral groove (52) serves as the folding pattern of the folding cylinder (51). The lower sliding ring (75) has an annular groove in the middle. The bottom of the plate (76) is connected to a ball bearing. The ball bearing rolls in the annular groove of the lower sliding ring (75). The lower sliding ring (75) rotates synchronously with the stirring paddle (6). The lower sliding ring (75) slides on the shaft of the stirring paddle (6). The top of the plate (76) is fixedly installed with a telescopic rod (77). The end of the telescopic rod (77) is fixedly connected to the reactor (2). The lubrication mechanism (8) includes a gravity rod (81), a piston (83), an injection tube (84), and a lubricating oil tank (86). The end of the gravity rod (81) is fixedly connected to the piston (83). The bottom of the lubricating oil tank (86) is fixedly connected to the top frame (4). The side of the lubricating oil tank (86) is connected to the injection tube (84) through a stainless steel tube. The piston (83) slides inside the injection tube (84). The stirring paddle (6) is rotatably connected to the top frame (4) through a bearing (9). The bearing (9) is located on the extension line of the injection tube (84).

2. The hydrate-based wastewater treatment device according to claim 1, characterized in that: The sewage is discharged from the sewage pipe (53) and forms a spiral along the sewage pipe (53). The direction of the sewage spiral is the same as the rotation direction of the stirring paddle (6). The rotation speed of the stirring paddle (6) is the same as the speed at which the sewage flows out of the sewage pipe (53). The end of the carbon dioxide pipe (54) adopts a wavy structure. The position of the carbon dioxide pipe (54) is offset from the position of the stirring paddle (6). Multiple vent holes (55) are provided on the carbon dioxide pipe (54). All vent holes (55) on the same carbon dioxide pipe (54) are on the same plane. The outlet direction of the vent hole (55) is the same as the direction of the sewage spiral.

3. A hydrate-based wastewater treatment device according to claim 2, characterized in that: A sleeve (56) is fixedly installed at the top opening of the folded cylinder (51). The sleeve (56) adopts a hollow frustum structure. The bottom of the sleeve (56) is fixedly connected to the base (57). The base (57) and the reactor (2) form a storage tank to collect the sewage overflowing from the opening of the folded cylinder (51).

4. A hydrate-based wastewater treatment device according to claim 3, characterized in that: A discharge pipe (58) is fixedly installed at the center of the base (57). A one-way valve is fixedly installed at one end of the discharge pipe (58), and a filtration bottle and a vacuum pump are fixedly installed at the other end of the discharge pipe (58).

5. A hydrate-based wastewater treatment device according to claim 4, characterized in that: The end of the gravity rod (81) is connected to a ball bearing (82). The upper sliding ring (79) is hinged to the linkage rod (74) on the upper side of the slider (73). The ball bearing (82) rolls on the top of the upper sliding ring (79). The end of the injection tube (84) is connected to a nozzle (85). The diameter of the nozzle (85) is the same as the diameter of the bearing (9). The nozzle (85) has multiple openings facing the ball bearing (9).

6. A hydrate-based wastewater treatment device according to claim 5, characterized in that: The stirring paddle (6) is fixedly connected to the motor via a rotating shaft. A light source and a camera are fixedly installed in the two mounting tubes (3), respectively. The light source and the camera are both tilted. The folding cylinder (51) is located on the extension line of the light source and the camera. A mounting base (1) is fixedly installed at the bottom of the reactor (2).

7. A hydrate-based wastewater treatment method, applied to the hydrate-based wastewater treatment apparatus of claim 6, comprising the following steps: S1. Filling with wastewater: First, the reactor (2) is thoroughly cleaned and dried. Wastewater with a concentration that matches the fusion reactor coolant activation corrosion product concentration is prepared, poured into the reactor (2), and sealed at a temperature of 288.2K. S2. Inject carbon dioxide and increase the pressure: Inject carbon dioxide gas into reactor (2) and pressurize it to a certain pressure. Stabilize the reactor at a sealed temperature for 30 minutes. In this step, the precise amount of carbon dioxide injected into the reactor is determined. S3. Increase the contact area between carbon dioxide and water: Under sealed temperature, the stirring paddle (6) is continuously stirred at a rate of 600 rpm for 60 minutes. The vortex formed by the sewage entering the folded cylinder (51) has a certain rotation speed. The stirring paddle (6) rotates to maintain the rotation speed of the vortex. The difference between the rotation speed of the stirring paddle (6) and the rotation speed of the vortex is small. S4. Formation of hydrates: Carbon dioxide hydrates are induced by cooling the reactor (2) to a temperature of 275.2K at a rate of 6.0K / h. The formation of hydrates is achieved by sudden temperature fracture followed by a drop in gas pressure. The hydrate particles are observed by a camera. The hydrates and heavy metals form hydrate precipitates and separate into layers with the wastewater. The speed of the stirring paddle (6) is reduced, and the folding cylinder (51) is folded to discharge the wastewater that does not contain heavy metals in the upper layer, thereby reducing the amount of hydrate precipitates and wastewater mixture extracted and accelerating the extraction speed. S5. Separation of hydrates and wastewater: The hydrate precipitate and unreacted wastewater after the reaction are separated into solid and liquid components. Vacuum filtration is performed at room temperature for 30 seconds to obtain hydrate precipitate and residual wastewater. The hydrate precipitate is centrifuged at -5℃ and 4000r / min for 3 minutes to further remove the salt solution inside the hydrate precipitate and the salt remaining on the surface of the hydrate precipitate. After centrifugation, the hydrate precipitate is placed at room temperature to allow it to decompose on its own to obtain pure water.

Images