A method and device for treating refractory organic wastewater

Abstract

The invention relates to the technical field of wastewater treatment, and specifically discloses a method for treating refractory organic wastewater. The method comprises the following steps: pumping wastewater into an anaerobic tank with a residence time of 0.5-2.0h; pumping effluent from the anaerobic tank into an anoxic tank with a residence time of 0.5-3.5h; pumping effluent from the anoxic tank into an aerobic tank with a residence time of 4-12.0h, and refluxing a mixed solution to an anoxic reaction tank with a reflux ratio of 100-500%; pumping effluent from the aerobic tank into a secondary sedimentation tank with a residence time of 1.0-4.0h; pumping precipitated effluent from the secondary sedimentation tank into an ozone ultrasonic reaction tank with a reaction time of 0.2-1.0h; pumping oxidized effluent into a pH adjustment tank to adjust the pH to 3.0-5.0; and pumping oxidized effluent into an ultraviolet oxidation tank for oxidation treatment. In this invention, part of the organic pollutants are removed through the anaerobic-anoxic-aerobic combined process, and then the purpose of harmless treatment is achieved through two treatment processes: ozone-ultrasound synergistic process and ultraviolet-persulfate-hydrogen peroxide composite process.

Description

Technical Field

[0001] The invention relates to a method and device for treating wastewater, and in particular to a method and device for treating refractory organic wastewater, belonging to the technical field of wastewater treatment. Background Art

[0002] The organic matter concentration of refractory organic wastewater is high, and the COD usually exceeds 2000 mg / L, and can even exceed 100,000 mg / L; the BOD5 / COD ratio is usually less than 0.3 or even lower, and the wastewater has low biodegradability and is difficult to degrade; the wastewater contains a variety of pollutants such as heavy metals, nitrides, sulfides, and toxic organic matter, and the composition is very complex; it is even toxic and "three-cause" hazards, which are extremely harmful to the environment. This type of wastewater is discharged into the water body. Due to its high concentration of COD, it will consume a large amount of oxygen in the water under the degradation of microorganisms, resulting in hypoxia or even anaerobic water bodies, which will cause the death of aquatic organisms and deterioration of water quality. At the same time, the wastewater also contains a large amount of refractory organic matter and toxic and harmful substances such as heavy metals and sulfides, which are highly toxic and can accumulate in water and soil environments, and eventually enter the human body through the food chain, endangering human health.

[0003] At present, biochemical, advanced oxidation, membrane treatment and other processes are commonly used to treat difficult-to-degrade organic pollutants. However, due to the complex composition of leachate, when using a single process to treat difficult-to-degrade organic matter such as benzene series, organic amines, ketones, ethers, etc., it often faces problems such as poor removal effect, large amount of difficult-to-degrade pollutants residues, poor biochemical degradation effect and high treatment cost. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to provide a method and device for treating difficult-to-degrade organic wastewater.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A method for treating refractory organic wastewater, the method comprising the following steps:

[0007] Step 1: Pump the wastewater into the anaerobic tank and control the anaerobic biochemical retention time to 0.5-2.0h;

[0008] Step 2: Pump the effluent from the anaerobic tank into the anoxic tank, and control the retention time to 0.5-3.5h;

[0009] Step 3: Pump the effluent from the anoxic tank into the aerobic tank, control the residence time to be 4-12.0h, return the mixed solution to the anoxic reaction tank, and control the mixed solution reflux ratio to be 100-500%;

[0010] Step 4: Pump the effluent from the aerobic tank into the secondary sedimentation tank, control the retention time to 1.0-4.0h, return the remaining sludge to the anaerobic reaction tank, and control the sludge return ratio to 20-100%;

[0011] Step 5: Pump the precipitated water from the secondary sedimentation tank into the ozone ultrasonic reaction tank, and control the reaction time to 0.2-1.0h;

[0012] Step 6: Pump the oxidized effluent into the pH adjustment tank to adjust the pH of the oxidized effluent to 3.0-5.0;

[0013] Step 7: Pump the oxidized water into the UV oxidation pool, turn on the UV oxidation equipment, add oxidants such as hydrogen peroxide and sodium persulfate to the wastewater under UV irradiation activation conditions for oxidation treatment, and control the power of the UV oxidation equipment to 3-10kw / m 3 , the amount of sodium persulfate added is 1.0-3.0kg / m 3 , the amount of hydrogen peroxide added is 0.3-1.0l / m 3 , control the reaction time to 0.25-1.5h;

[0014] Step 8: After the wastewater treatment meets the standards, the treated wastewater will be discharged through the drainage pipe.

[0015] Optionally, the ozone generator in the ozone ultrasonic reaction tank is an oxygen source ozone generator, and the reaction time is 0.2-1.0h.

[0016] Optionally, the ultraviolet oxidation device is an ultraviolet lamp, and the wavelength of ultraviolet light emitted by the ultraviolet lamp is 254nm.

[0017] Optionally, the mass concentration of sodium persulfate is 98%, and the mass concentration of hydrogen peroxide is 30%.

[0018] A treatment device for refractory organic wastewater, the device is applied to the above-mentioned preparation method, the device comprises an ultraviolet oxidation pool, a stirring mechanism for mixing wastewater, hydrogen peroxide and sodium persulfate is arranged inside the ultraviolet oxidation pool, two top plates are installed on the top of the ultraviolet oxidation pool, a box is installed on the top of the two top plates, a treatment mechanism for treating agglomerates in the sodium persulfate is arranged inside the box, and a guide plate for quickly pouring the sodium persulfate into the box is arranged on the top of the ultraviolet oxidation pool.

[0019] Optionally, two fixing rods are installed on the outer wall of the box body, and a movable groove is opened on the outer wall on the side away from the box body, and a first electric slider is installed in each of the two movable grooves, and the ends of the two first electric sliders that are away from each other are commonly connected to a movable plate, and a circular groove is opened on the top of the movable plate, and a second electric slider is installed inside the circular groove, and a rotating seat is installed on the top of the guide plate, and a slider hinged to the rotating seat is slidably installed on the side of the guide plate close to the box body, and a first extension plate and a second extension plate are respectively installed inside the guide plate, and two sliding grooves are opened on the outer walls on both sides opposite to the guide plate, and the first extension plate and the second extension plate slide up and down in the two sliding grooves respectively through the moving block installed on the outer wall and the fourth electric slider, and a motor is installed on the outer wall of the guide plate close to one of the sliding grooves, and a screw rod is coaxially connected to the output end of the motor, and the end of the screw rod away from the motor passes through the movable plate of the first extension plate, and a plurality of cross bars are equidistantly installed on the ends of the guide plate and the second extension plate away from the box body.

[0020] Optionally, the processing mechanism includes a rotating shaft rotatably installed at the bottom of the ultraviolet oxidation tank, the top end of the rotating shaft extends into the box body, and a first push plate, a second push plate and a third push plate are installed in sequence from bottom to top; the interior of the box body is located below the third push plate and the second push plate, and a first filter plate and a second filter plate are installed respectively; the outer wall of the rotating shaft above the second filter plate is also equipped with two rolling rollers for crushing small agglomerates of sodium persulfate; a discharge port is provided on the outer wall of the box body above the first filter plate, and a sealing door is hinged in the discharge port; and two discharge ports are provided on the outer wall of the box body close to the first push plate.

[0021] Optionally, fixed bars are installed on the opposite outer walls of the guide plate, and the outer walls of the two fixed bars away from the guide plate are respectively provided with slots and plug-in blocks, and telescopic airbags are slidably installed inside the slots and outside the plug-in blocks.

[0022] Optionally, a crushing box is installed on the outer wall of one side of the ultraviolet oxidation tank, and a feed hopper used in conjunction with a second extension plate is installed on the top of the crushing box. Two crushing plates that cooperate to crush large lumps of sodium persulfate are symmetrically arranged inside the crushing box. One of the crushing plates is slidably connected to the crushing box through two sliding rods installed on the outer wall, and the outer walls of one end of the two sliding rods inside the crushing box are both equipped with return springs.

[0023] Optionally, the stirring mechanism includes two stirring plates slidably installed inside the ultraviolet oxidation pool, and drive racks are installed on the sides of the two stirring plates close to each other. A drive half gear meshing with the two drive racks is installed on the outer wall of the rotating shaft located inside the ultraviolet oxidation pool, and the outer wall of one stirring plate away from the drive rack is connected to the inner wall of the ultraviolet oxidation pool through two elastic ropes, and the ends of the two sliding rods away from the crushing plate pass through the crushing box and the ultraviolet oxidation pool, and the outer wall of the other stirring plate away from the drive rack is connected to one end of the two sliding rods inside the ultraviolet oxidation pool through two elastic ropes.

[0024] The beneficial effects of the present invention are:

[0025] 1. In the invention, firstly, a part of the difficult-to-degrade organic pollutants is removed by an anaerobic-anoxic-aerobic combined process, and then two treatment processes, namely an ozone-ultrasound synergistic process and an ultraviolet-persulfate-hydrogen peroxide composite process, are used to stimulate the generation of sulfate radicals and hydroxyl radicals, which have a very high redox potential and can effectively undergo electron transfer, addition, hydrogen substitution and other reactions with organic pollutants, and decompose difficult-to-degrade organic substances such as aliphatic hydrocarbons, benzene series, organic amines, ketones, ethers, etc. into easily degradable substances by ring-opening, thereby improving the removal rate of difficult-to-degrade organic substances and achieving the purpose of harmless treatment; at the same time, some difficult-to-degrade organic pollutants (such as phenol) can absorb energy and transform from a stable state to an excited state under the irradiation of ultraviolet light of a specific wavelength, and undergo chemical reactions in the oxidation reaction tank to generate easily degradable substances, or become intermediate products that induce thermal reactions; ultraviolet light has a direct or indirect degradation effect on some difficult-to-degrade organic pollutants, which can effectively improve the oxidation capacity, and can form a composite oxidation system with persulfate to exert a synergistic oxidation effect, greatly improve the oxidation reaction rate, and enhance the treatment capacity of landfill leachate.

[0026] 2. In the present invention, by adjusting the reaction time of ozone ultrasound, ultraviolet oxidation process, and the intensity of ultraviolet light, the purpose of effectively controlling the degradation rate of pollutants and the length of reaction time can be achieved. The present invention has the remarkable characteristics of simple process, fast and efficient reaction, complete removal of difficult-to-degrade pollutants, low power loss, and easy control of reaction conditions. It has good engineering application value and promotion prospects.

[0027] 3. In the invention, before sodium persulfate is added to the wastewater in the ultraviolet oxidation tank, it is poured into the box through a guide plate, and the large and small lumps in the sodium persulfate are removed or crushed by a processing mechanism arranged in the box, and then it is discharged into the ultraviolet oxidation tank. The stirring mechanism arranged in the ultraviolet oxidation tank is used to stir the wastewater, sodium persulfate and hydrogen peroxide, so that the sodium persulfate, hydrogen peroxide and the wastewater can be mixed evenly, thereby shortening the mixing time of sodium persulfate and the wastewater in the ultraviolet oxidation tank, improving the oxidation efficiency of sodium persulfate and wastewater, and avoiding the problem that the mixing time of lumpy sodium persulfate and wastewater is too long, which causes waste and also reduces the oxidation efficiency.

[0028] 4. In the invention, after sodium persulfate enters the box through the guide plate, the hinge shaft between the third electric slider and the rotating seat can be driven to rotate by an external driving mechanism, thereby driving the guide plate to rotate upward to a horizontal state. The staff can then push the guide plate toward the box until the guide plate is just located at the top of the box. The interior of the two telescopic airbags is inflated by an external gas transmission mechanism, so that the two telescopic airbags are inflated and expanded. The opening at the top of the box can be blocked with the help of the guide plate itself, thereby preventing part of the sodium persulfate from overflowing from the opening at the top of the box when the third push plate rotates to screen the agglomerates in the sodium persulfate on the top of the first filter plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0030] Figure 1 This is a flow chart of a method for treating refractory organic wastewater according to the present invention;

[0031] Figure 2 This is a schematic diagram of the overall structure of a treatment device for difficult-to-degrade organic wastewater proposed by the present invention;

[0032] Figure 3 This is a schematic diagram of the structure in which sodium persulfate enters the box through a guide plate in the present invention;

[0033] Figure 4 It is a schematic diagram of the structure in which the bulk filtered sodium acid is discharged into the crushing box through the guide plate in the present invention;

[0034] Figure 5 It is a schematic structural diagram of the guide plate, the first extension plate and the second extension plate in the present invention;

[0035] Figure 6 It is a structural cross-sectional view of the box body in the present invention;

[0036] Figure 7 It is a structural cross-sectional view of the ultraviolet oxidation tank in the present invention;

[0037] Figure 8 It is a schematic diagram of the structure of the stirring plate and the crushing plate in the present invention.

[0038] In the figure: 1. UV oxidation tank; 2. box body; 3. crushing box; 4. stirring plate; 5. guide plate; 6. moving plate; 7. discharge port; 8. top plate; 9. circular groove; 10. feed hopper; 11. discharge port; 12. rotating shaft; 14. first electric slider; 15. second electric slider; 16. telescopic airbag; 17. plug block; 18. slot; 19. first extension plate; 20. second extension plate; 21. fourth electric slider; 22. cross bar; 23. fixed rod; 24. third push plate; 25. first filter plate; 26. rolling roller; 27. second filter plate; 28. first push plate; 29. ​​second push plate; 30. driving half gear; 31. elastic rope; 32. driving rack; 33. crushing plate; 34. reset spring; 35. slide bar. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Reference Figure 1-Figure 8 , a method for treating refractory organic wastewater, the method comprising the following steps:

[0041] Step 1: Pump the wastewater into the anaerobic tank and control the anaerobic biochemical retention time to 0.5-2.0h;

[0042] Step 2: Pump the effluent from the anaerobic tank into the anoxic tank, and control the retention time to 0.5-3.5h;

[0043] Step 3: Pump the effluent from the anoxic tank into the aerobic tank, control the residence time to be 4-12.0h, return the mixed solution to the anoxic reaction tank, and control the mixed solution reflux ratio to be 100-500%;

[0044] Step 4: Pump the effluent from the aerobic tank into the secondary sedimentation tank, control the retention time to 1.0-4.0h, return the remaining sludge to the anaerobic reaction tank, and control the sludge return ratio to 20-100%;

[0045] Step 5: Pump the precipitated water from the secondary sedimentation tank into the ozone ultrasonic reaction tank, and control the reaction time to 0.2-1.0h;

[0046] Step 6: Pump the oxidized effluent into the pH adjustment tank to adjust the pH of the oxidized effluent to 3.0-5.0;

[0047] Step 7: Pump the oxidized water into the UV oxidation pool 1, start the UV oxidation equipment, add oxidant hydrogen peroxide and sodium persulfate to the wastewater under UV irradiation activation conditions for oxidation treatment, and control the power of the UV oxidation equipment to 3-10kw / m 3 , the amount of sodium persulfate added is 1.0-3.0kg / m 3 , the amount of hydrogen peroxide added is 0.3-1.0l / m 3 , control the reaction time to 0.25-1.5h;

[0048] Step 8: After the wastewater treatment meets the standards, the treated wastewater will be discharged through the drainage pipe.

[0049] As a technical optimization solution of the present invention, the ozone generator in the ozone ultrasonic reaction tank is an oxygen source ozone generator, and the reaction time is 0.2-1.0h.

[0050] As a technical optimization solution of the present invention, the ultraviolet oxidation equipment is an ultraviolet lamp, and the wavelength of ultraviolet light emitted by the ultraviolet lamp is 254nm.

[0051] As a technical optimization solution of the present invention, the mass concentration of sodium persulfate is 98%, and the mass concentration of hydrogen peroxide is 30%.

[0052] A treatment device for refractory organic wastewater, the device is applied to the above-mentioned preparation method, the device comprises an ultraviolet oxidation pool 1, the interior of the ultraviolet oxidation pool 1 is provided with a stirring mechanism for mixing wastewater, hydrogen peroxide and sodium persulfate, two top plates 8 are installed on the top of the ultraviolet oxidation pool 1, and a box 2 is installed on the top of the two top plates, the interior of the box 2 is provided with a treatment mechanism for treating agglomerates in the sodium persulfate, and the top of the ultraviolet oxidation pool 1 is provided with a guide plate 5 for quickly pouring the sodium persulfate into the box 2.

[0053] As a technical optimization solution of the present invention, two fixing rods 23 are installed on the outer wall of the box body 2, and a movable groove is opened on the outer wall of the side away from the box body 2, and a first electric slider 14 is installed in the two movable grooves. The ends of the two first electric sliders 14 that are away from each other are commonly connected to a movable plate 6, and a circular groove 9 is opened on the top of the movable plate 6. A second electric slider 15 is installed inside the circular groove 9, and a rotating seat is installed on the top of the movable plate 6. A slider hinged to the rotating seat is slidably installed on the side of the guide plate 5 close to the box body 2, and the inside of the guide plate 5 is respectively installed A first extension plate 19 and a second extension plate 20 are installed, and two slide grooves are provided on the outer walls on both sides opposite to each other of the guide plate 5. The first extension plate 19 and the second extension plate 20 slide up and down in the two slide grooves respectively through the moving blocks installed on the outer walls and the fourth electric slider 21. A motor is installed on the outer wall of the guide plate 5 near one of the slide grooves, and a lead screw is coaxially connected to the output end of the motor. The end of the lead screw away from the motor passes through the moving plate 6 of the first extension plate 19, and a plurality of cross bars 22 are equidistantly installed on the ends of the guide plate 5 and the second extension plate 20 away from the box body 2. After the wastewater enters the ultraviolet oxidation pool 1, it is necessary to add hydrogen peroxide and sodium persulfate to the wastewater to accelerate the oxidation treatment of the wastewater. Since sodium persulfate is a substance that is easily soluble in water, if it is affected by external moisture during the storage of sodium persulfate, it is easy to cause lumps of different sizes to appear inside the sodium persulfate. If the sodium persulfate with lumps is directly added to the wastewater, the lumps are not easy to dissolve in the wastewater in a short time, thereby making the fusion between sodium persulfate and the wastewater insufficient, reducing the oxidation efficiency of the wastewater. In view of this situation, before the sodium persulfate is added to the ultraviolet oxidation pool 1, an external The driving device drives the hinge shaft between the rotating seat and the slider to rotate, and then drives the guide plate 5 to rotate upward to an inclined state greater than 90 degrees, and then starts the motor to drive the screw rod to rotate, which can drive the first extension plate 19 to extend from the inside of the guide plate 5, and the extended end of the first extension plate 19 extends to the inside of the box 2. At this time, the staff can pour sodium persulfate into the box 2 through the inclined guide plate 5 and the first extension plate 19, and process the large and small agglomerates in the sodium persulfate through the processing mechanism in the box 2, so that the sodium persulfate and the wastewater are mixed more quickly and evenly.

[0054] As a technical optimization scheme of the present invention, the processing mechanism includes a rotating shaft 12 rotatably installed at the bottom of the ultraviolet oxidation tank 1, the top of the rotating shaft 12 extends into the box body 2, and the first push plate 28, the second push plate 29 and the third push plate 24 are installed from bottom to top in sequence. The interior of the box body 2 is located below the third push plate 24 and the second push plate 29, and the first filter plate 25 and the second filter plate 27 are respectively installed. The outer wall of the rotating shaft 12 above the second filter plate 27 is also equipped with two rolling rollers 26 for rolling and crushing small agglomerates of sodium persulfate. The outer wall of the box body 2 above the first filter plate 25 is provided with a discharge port 11, and a sealing door is hinged in the discharge port 11. The outer wall of the box body 2 close to the first push plate 28 is provided with two discharge ports 7. After sodium persulfate enters the interior of the housing 2, it accumulates on the top of the first filter plate 25, and is connected to the bottom end of the rotating shaft 12 through an external driving mechanism, so that the external driving mechanism can drive the rotating shaft 12 and the first push plate 28, the second push plate 29, the third push plate 24 and the rolling roller 26 installed on the outer wall of the rotating shaft 12 to rotate together in the interior of the housing 2. The sodium persulfate accumulated on the top of the first filter plate 25 mixed with small agglomerates will quickly pass through the filter holes of the first filter plate 25 through the rotating third push plate 24 and fall downward to the top of the second filter plate 27. The filter holes of the second filter plate 27 are smaller than the filter holes of the first filter plate 25, so the small agglomerates falling on the top of the second filter plate 27 will be crushed by the rotating crushing roller 26 and the second push plate 29, and the crushed sodium persulfate will pass through the filter holes of the second filter plate 27 and fall downward to the bottom of the box body 2, and then be pushed to the two discharge ports 7 by the rotation of the first push plate 28 to be discharged into the ultraviolet oxidation tank 1, while the large agglomerates in the filtered sodium persulfate will still remain on the top of the first filter plate 25, so as to avoid the blocky sodium persulfate from mixing with the wastewater for too long, causing waste and reducing the oxidation efficiency.

[0055] As a technical optimization scheme of the present invention, fixed bars are installed on the opposite side outer walls of the guide plate 5, and the outer walls of the two fixed bars on the side away from the guide plate 5 are respectively provided with a slot 18 and an insert block 17, and the inside of the slot 18 and the outside of the insert block 17 are slidably installed with a telescopic airbag 16. After the sodium persulfate enters the box body 2 through the guide plate 5, the hinge shaft between the slider and the rotating seat can be driven to rotate by an external driving mechanism, thereby driving the guide plate 5 to rotate upward to a horizontal state. The staff can then push the guide plate 5 to move toward the box body 2 until the guide plate 5 is just located at the top of the box body 2, and then inflate the inside of the two telescopic airbags 16 through an external gas supply mechanism, so that the two telescopic airbags 16 are in an inflated and expanded state, and cooperate with the guide plate 5 itself to block the opening at the top of the box body 2, thereby preventing the third push plate 24 from rotating to screen the lumps in the sodium persulfate on the top of the first filter plate 25. When the time is up, part of the sodium persulfate overflows from the top opening of the box body 2; and during the wastewater treatment process in the ultraviolet oxidation pool 1, the staff stands near the ultraviolet oxidation pool 1 to check the wastewater treatment situation. If an unexpected situation occurs in which a staff member accidentally falls into the ultraviolet oxidation pool 1, the second electric slider 15 installed in the circular groove 9 can drive the rotating seat, the slider and the guide plate 5 to rotate and adjust the position together at the top of the moving plate 6, until the second electric slider 15 drives the guide plate 5 to move to a position close to the person who falls into the water, and then the hinge shaft between the slider and the rotating seat is driven to rotate by an external driving mechanism, thereby driving the guide plate 5 to rotate. After the guide plate 5 rotates to a vertical state, the fourth electric slider 21 drives the second extension plate 20 in the slide groove to extend downward from the inside of the guide plate 5 until one end of the second extension plate 20 extends to the inside of the ultraviolet oxidation pool 1. After seeing the position of the second extension plate 20, the person who falls into the water swims towards the second extension plate 20 and climbs upward with the help of the second extension plate 20 and a plurality of cross bars 22 provided on the guide plate 5, so that the person who falls into the water can escape from danger and achieve the effect of self-rescue. If the person who falls into the water cannot swim and cannot complete self-rescue with the help of the guide plate 5 and the second extension plate 20 after falling into the ultraviolet oxidation pool 1, When other staff members near the ultraviolet oxidation pool 1 do not have any rescue tools, they can slide and remove the two telescopic airbags 16 on both sides of the guide plate 5 respectively, and after the two telescopic airbags 16 are plugged and connected through the matching plug blocks 17 and slots 18, the two telescopic airbags 16 are inflated with the help of an external air supply mechanism, so that the two telescopic airbags 16 are inflated and expanded. After they are thrown into a position close to the person who falls into the water, it is convenient for the person who falls into the water to float on the water with the help of the inflated telescopic airbags 16, which is convenient for subsequent rescue personnel to rescue them, thereby bringing certain guarantees to the safety of the person who falls into the water.

[0056] As a technical optimization scheme of the present invention, a crushing box 3 is installed on the outer wall of one side of the ultraviolet oxidation pool 1, and a feeding hopper 10 used in conjunction with the second extension plate 20 is installed on the top of the crushing box 3. Two crushing plates 33 for crushing large lumps of sodium persulfate are symmetrically arranged inside the crushing box 3. One of the crushing plates 33 is slidably connected to the crushing box 3 through two sliding rods 35 installed on the outer wall, and the outer wall of one end of the two sliding rods 35 in the crushing box 3 is provided with a return spring 34. After the sodium persulfate in the box body 2 is discharged into the ultraviolet oxidation pool 1, the guide plate 5 can be manually pushed away from the top of the box body 2 and reset, and the large piece of sodium persulfate remaining on the top of the first filter plate 25 can be moved upward in the movable groove of the fixing rod 23 by the first electric slider 14, thereby driving the movable plate 6 to move downward on the outer wall of the box body 2 to below the discharge port 11, and then the hinge shaft between the slider and the rotating seat is driven to rotate by an external driving mechanism, thereby driving the end of the guide plate 5 close to the box body 2 to rotate upward, and the lead screw is driven to rotate by the motor, so that the first extension plate 19 located inside the guide plate 5 extends out and abuts against the outer wall of the box body 2. At this time, the first extension plate 19 and the guide plate 5 are in an inclined state and are located directly below the discharge port 11, and then the second extension plate 20 is driven to extend from the bottom end of the guide plate 5 by the fourth electric slider 21 until the extended end of the second extension plate 20 extends to the top of the feed hopper 10 at the top of the crushing box 3. The large pieces of sodium persulfate located on the top of the first filter plate 25 will be discharged from the discharge port 11 to the top of the first extension plate 19 as the rotating shaft 12 drives the third push plate 24 to rotate, and are introduced into the crushing box 3 along the tops of the first extension plate 19, the guide plate 5 and the second extension plate 20, thereby improving the practicality of the guide plate 5 and other structures and enabling them to have multiple usage methods.

[0057] As a technical optimization scheme of the present invention, the stirring mechanism includes two stirring plates 4 slidably installed inside the ultraviolet oxidation pool 1, and the two stirring plates 4 are each installed with a driving rack 32 on the side close to each other. The outer wall of the rotating shaft 12 located inside the ultraviolet oxidation pool 1 is installed with a driving half gear 30 meshing with the two driving racks 32. The outer wall of one stirring plate 4 away from the driving rack 32 is connected to the inner wall of the ultraviolet oxidation pool 1 through two elastic ropes 31, and the ends of the two sliding rods 35 away from the crushing plate 33 pass through the crushing box 3 and the ultraviolet oxidation pool 1, and the outer wall of the other stirring plate 4 away from the driving rack 32 is connected to one end of the two sliding rods 35 in the ultraviolet oxidation pool 1 through two elastic ropes 31. After sodium persulfate and hydrogen peroxide are added to the wastewater in the ultraviolet oxidation pool 1, the rotating shaft 12 continues to be driven to rotate by an external driving device, thereby driving the driving half gear 30 to rotate synchronously. While the driving half gear 30 rotates, it will repeatedly mesh with the two driving racks 32, driving the two driving racks 32 to move in a direction close to each other, and then drive the two stirring plates 4 to move in a direction close to each other in the ultraviolet oxidation pool 1 through the two driving racks 32. Since the two stirring plates 4 are respectively connected to the inner wall of the ultraviolet oxidation pool 1 and the two sliding rods 35 through elastic ropes 31, when the driving half gear 30 rotates to a position without teeth, the elastic reset of the elastic rope 31 will drive the stirring plate 4 to reset, so that the two stirring plates 4 are The plate 4 can move back and forth in the ultraviolet oxidation pool 1 to stir the wastewater, promote the fusion of the wastewater with hydrogen peroxide and sodium persulfate more fully, and improve the oxidation efficiency of the wastewater; the large pieces of sodium persulfate entering the crushing box 3 will fall between the two crushing plates 33, and the movement of one of the stirring plates 4 drives one of the crushing plates 33 to move away from the other crushing plate 33. When one of the stirring plates 4 is reset with the help of the elastic rope 31, the elastic reset of the reset spring 34 is caused to reset, thereby driving one of the crushing plates 33 to move quickly toward the other crushing plate 33. With the help of the crushing teeth on the side close to the two crushing plates 33, the large pieces of sodium persulfate can be squeezed and crushed, which is convenient for subsequent use.

[0058] In the present invention, before sodium persulfate is put into the ultraviolet oxidation pool 1, the guide plate 5 is driven to rotate upward to an inclined state by an external driving device, and then the motor drives the screw to rotate and then drives the first extension plate 19 to extend from the inside of the guide plate 5 to the inside of the box 2. At this time, the staff can pour the sodium persulfate into the box 2 through the guide plate 5 and the first extension plate 19 in the inclined state; after the sodium persulfate enters the inside of the box 2, it will accumulate on the top of the first filter plate 25. Through the processing mechanism arranged inside the box 2, the small agglomerates in the sodium persulfate can be crushed and broken, and the large agglomerates in the filtered sodium persulfate will still remain on the top of the first filter plate 25, so as to avoid the block of sodium persulfate and wastewater mixing time too long, causing waste and reducing the oxidation efficiency.

[0059] While the processing mechanism inside the box 2 is filtering and screening the sodium persulfate, the guide plate 5 is driven to rotate upward to a horizontal state through an external driving mechanism. The staff pushes the guide plate 5 to be located at the top of the box 2, and inflates the inside of the two telescopic airbags 16 through an external gas supply mechanism, so that the two telescopic airbags 16 are inflated and expanded. The guide plate 5 itself can block the opening at the top of the box 2 to prevent part of the sodium persulfate from overflowing from the opening at the top of the box 2.

[0060] Furthermore, during the wastewater treatment process in the ultraviolet oxidation pool 1, if an unexpected situation occurs in which a worker accidentally falls into the ultraviolet oxidation pool 1, the second electric slider 15 can be used to drive the guide plate 5 to move to a position close to the person who falls into the water, and the guide plate 5 can be driven to rotate to a vertical state by an external driving mechanism, and the fourth electric slider 21 drives the second extension plate 20 to extend and extend to the interior of the ultraviolet oxidation pool 1, and the person who falls into the water can climb upward with the help of the second extension plate 20 and the multiple cross bars 22 provided on the guide plate 5, so that the person who falls into the water can escape from danger and achieve the effect of self-rescue; if the person who falls into the water cannot swim and cannot complete self-rescue with the help of the guide plate 5 and the second extension plate 20, other staff members can disassemble the two telescopic airbags 16, and after the two telescopic airbags 16 are plugged and connected, the two telescopic airbags 16 are inflated with the help of an external gas transmission mechanism, so that the two telescopic airbags 16 are inflated and expanded, and after they are thrown into a position close to the person who falls into the water, it is convenient for the person who falls into the water to float on the water with the help of the inflated telescopic airbags 16, so that subsequent rescue personnel can rescue them.

[0061] After the sodium persulfate in the box body 2 is discharged into the ultraviolet oxidation pool 1, the large pieces of sodium persulfate remaining on the top of the first filter plate 25 can be driven by the first electric slider 14 to move the movable plate 6 downward to the position below the discharge port 11, and then the guide plate 5 is driven by an external driving mechanism to rotate upward at one end close to the box body 2, and the first extension plate 19 is driven by the motor to extend and abut against the outer wall of the box body 2, and then the second extension plate 20 is driven to extend by the fourth electric slider 21, until one end of the second extension plate 20 extends to the top of the feed hopper 10, the large pieces of sodium persulfate located on the top of the first filter plate 25 will be discharged from the discharge port 11 to the top of the first extension plate 19, and introduced into the crushing box 3 along the top of the first extension plate 19, the guide plate 5 and the second extension plate 20, thereby improving the practicality of the guide plate 5 and other structures.

[0062] The specific implementation of the present invention is further described below in conjunction with the examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention, and cannot be used to limit the protection scope of the present invention.

[0063] Embodiment 1:

[0064] The chemical wastewater from a certain factory is selected as the treatment object. The indicators of the chemical wastewater are shown in Table 1 below:

[0065] Table 1:

[0066]

[0067] See also Figure 1 As shown, the above-mentioned chemical wastewater is treated, specifically comprising the following steps:

[0068] Step 1: Pump the wastewater into the anaerobic tank and control the anaerobic biochemical retention time to 1.5h;

[0069] Step 2: Pump the effluent from the anaerobic tank into the anoxic tank and control the retention time to 2.0h;

[0070] Step 3: Pump the effluent from the anoxic tank into the aerobic tank, control the residence time to 10 hours, return the mixed solution to the anoxic reaction tank, and control the mixed solution reflux ratio to 400%;

[0071] Step 4: Pump the effluent from the aerobic tank into the secondary sedimentation tank, control the retention time to 2.0h, return the remaining sludge to the anaerobic reaction tank, and control the sludge return ratio to 50%;

[0072] Step 5: Pump the precipitated water from the secondary sedimentation tank into the ozone ultrasonic reaction tank, and control the reaction time to 0.5h;

[0073] Step 6: Pump the oxidized effluent into the pH adjustment tank to adjust the pH of the oxidized effluent to 3.5;

[0074] Step 7: Pump the oxidized water into the UV oxidation pool, turn on the UV oxidation equipment, add oxidants such as hydrogen peroxide and sodium persulfate to the wastewater under UV irradiation activation conditions for oxidation treatment, and control the power of the UV oxidation equipment to 7kw / m 3 , the amount of sodium persulfate added is 2.5kg / m 3 , the amount of hydrogen peroxide added is 0.8l / m 3 , control the reaction time to 0.5h;

[0075] After the oxidation process is completed, treated wastewater is obtained. After testing, the indicators of the treated wastewater are shown in Table 2 below:

[0076] Table 2:

[0077]

[0078] Embodiment 2:

[0079] The chemical wastewater from a certain factory is selected as the treatment object. The indicators of the chemical wastewater are shown in Table 3 below:

[0080] Table 3:

[0081]

[0082] See also Figure 1 As shown, the above-mentioned chemical wastewater is treated, specifically comprising the following steps:

[0083] Step 1: Pump the wastewater into the anaerobic tank and control the anaerobic biochemical retention time to 1.5h;

[0084] Step 2: Pump the effluent from the anaerobic tank into the anoxic tank, and control the retention time to 2.5h;

[0085] Step 3: Pump the effluent from the anoxic tank into the aerobic tank, control the residence time to 12 hours, return the mixed solution to the anoxic reaction tank, and control the mixed solution reflux ratio to 400%;

[0086] Step 4: Pump the effluent from the aerobic tank into the secondary sedimentation tank, control the retention time to 2.0h, return the remaining sludge to the anaerobic reaction tank, and control the sludge return ratio to 50%;

[0087] Step 5: Pump the precipitated water from the secondary sedimentation tank into the ozone ultrasonic reaction tank. Control the reaction time to 0.75h;

[0088] Step 6: Pump the oxidized effluent into the pH adjustment tank to adjust the pH of the oxidized effluent to 3.0;

[0089] Step 7: Pump the oxidized water into the UV oxidation pool, turn on the UV oxidation equipment, add oxidants such as hydrogen peroxide and sodium persulfate to the wastewater under UV irradiation activation conditions for oxidation treatment, and control the power of the UV oxidation equipment to 8kw / m 3 , the amount of sodium persulfate added is 2.0kg / m 3 , the amount of hydrogen peroxide added is 0.9l / m 3 , control the reaction time to 1.0h;

[0090] After the oxidation process is completed, treated wastewater is obtained. After testing, the indicators of the treated wastewater are shown in Table 2 below:

[0091] See also Figure 1 As shown, the above-mentioned chemical wastewater is treated, specifically comprising the following steps:

[0092] Table 4:

[0093]

[0094] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A device for treating refractory organic wastewater, the device comprising an ultraviolet oxidation tank (1), characterized in that: The interior of the ultraviolet oxidation pool (1) is provided with a stirring mechanism for mixing wastewater, hydrogen peroxide and sodium persulfate. Two top plates (8) are installed on the top of the ultraviolet oxidation pool (1), and a box (2) is installed on the top of the top plates. A treatment mechanism for treating agglomerates in the sodium persulfate is provided inside the box (2). A guide plate (5) for quickly pouring the sodium persulfate into the box (2) is provided on the top of the ultraviolet oxidation pool (1). Two fixing rods (23) are installed on the outer wall of the box (2). The outer wall of the box (2) on the side away from the box (2) is provided with a movable groove. The two movable grooves are provided with a first electric slider (14). The ends of the two first electric sliders (14) away from each other are connected to a movable plate (6). A circular groove (9) is provided on the top of the movable plate (6). The circular groove (9) is provided with a first electric slider (14). A second electric slider (15) is provided, a rotating seat is installed on the top of the second electric slider (15), a slider hinged to the rotating seat is slidably installed on the side of the guide plate (5) close to the box body (2), a first extension plate (19) and a second extension plate (20) are respectively installed inside the guide plate (5), two slide grooves are provided on the two opposite outer walls of the guide plate (5), the first extension plate (19) and the second extension plate (20) slide up and down in the two slide grooves respectively through the moving blocks installed on the outer walls and the fourth electric slider (21), a motor is installed on the outer wall of the guide plate (5) close to one of the slide grooves, and the output end of the motor is coaxially connected with a screw rod, the end of the screw rod away from the motor passes through the moving block of the first extension plate (19), and the ends of the guide plate (5) and the second extension plate (20) away from the box body (2) are equidistantly installed with a plurality of cross bars (22); The processing mechanism comprises a rotating shaft (12) rotatably mounted at the bottom of the ultraviolet oxidation pool (1), the top end of the rotating shaft (12) extending into the box body (2) and being sequentially mounted with a first push plate (28), a second push plate (29) and a third push plate (24) from bottom to top, the inside of the box body (2) being respectively mounted with a first filter plate (25) and a second filter plate (27) below the third push plate (24) and the second push plate (29), the outer wall of the rotating shaft (12) above the second filter plate (27) being further mounted with two rolling rollers (26) for rolling and crushing small agglomerates of sodium persulfate, the outer wall of the box body (2) above the first filter plate (25) being provided with a discharge port (11), and a sealing door being hinged in the discharge port (11), and the outer wall of the box body (2) close to the first push plate (28) being provided with two discharge ports (7); The stirring mechanism comprises two stirring plates (4) slidably mounted inside the ultraviolet oxidation pool (1), and a driving rack (32) is mounted on each side of the two stirring plates (4) close to each other.

2. The device for treating refractory organic wastewater according to claim 1, characterized in that: The guide plate (5) has fixed blocks installed on both opposing outer walls, and the outer walls of the two fixed blocks on one side away from the guide plate (5) are respectively provided with a slot (18) and an insert block (17), and a telescopic air bag (16) is slidably installed inside the slot (18) and outside the insert block (17).

3. The device for treating refractory organic wastewater according to claim 1, characterized in that: A crushing box (3) is installed on one side of the outer wall of the ultraviolet oxidation pool (1), and a feeding hopper (10) used in conjunction with a second extension plate (20) is installed on the top of the crushing box (3). Two crushing plates (33) for crushing large lumps of sodium persulfate are symmetrically arranged inside the crushing box (3), one of the crushing plates (33) is slidably connected to the crushing box (3) through two sliding rods (35) installed on the outer wall, and a return spring (34) is mounted on the outer wall of one end of the two sliding rods (35) inside the crushing box (3).

4. The device for treating refractory organic wastewater according to claim 3, characterized in that: The outer wall of the rotating shaft (12) located inside the ultraviolet oxidation pool (1) is provided with a driving half gear (30) meshing with two driving racks (32); the outer wall of one stirring plate (4) away from the driving rack (32) is connected to the inner wall of the ultraviolet oxidation pool (1) via two elastic ropes (31); the ends of the two sliding rods (35) away from the crushing plate (33) pass through the crushing box (3) and the ultraviolet oxidation pool (1); the outer wall of the other stirring plate (4) away from the driving rack (32) is connected to one end of the two sliding rods (35) inside the ultraviolet oxidation pool (1) via two elastic ropes (31).

5. A method for treating refractory organic wastewater, the method being applied to the treatment device in claim 1, characterized in that: The method comprises the following steps: Step 1: Pump the wastewater into the anaerobic tank and control the anaerobic biochemical retention time to 0.5-2.0h; Step 2: Pump the effluent from the anaerobic tank into the anoxic tank, and control the retention time to 0.5-3.5h; Step 3: Pump the effluent from the anoxic tank into the aerobic tank, control the residence time to be 4-12.0h, return the mixed solution to the anoxic reaction tank, and control the mixed solution reflux ratio to be 100-500%; Step 4: Pump the effluent from the aerobic tank into the secondary sedimentation tank, control the retention time to 1.0-4.0h, return the remaining sludge to the anaerobic reaction tank, and control the sludge return ratio to 20-100%; Step 5: Pump the precipitated water from the secondary sedimentation tank into the ozone ultrasonic reaction tank, and control the reaction time to 0.2-1.0h; Step 6: Pump the oxidized effluent into the pH adjustment tank to adjust the pH of the oxidized effluent to 3.0-5.0; Step 7: Pump the oxidized water into the ultraviolet oxidation tank (1), start the ultraviolet oxidation equipment, add oxidants hydrogen peroxide and sodium persulfate to the wastewater under ultraviolet irradiation activation conditions to carry out oxidation treatment, control the power of the ultraviolet oxidation equipment to 3-10kw / m³, the amount of sodium persulfate added to 1.0-3.0kg / m³, the amount of hydrogen peroxide added to 0.3-1.0lkg / m³, and control the reaction time to 0.25-1.5h; Step 8: After the wastewater treatment meets the standards, the treated wastewater will be discharged through the drainage pipe.

6. The method for treating refractory organic wastewater according to claim 5, characterized in that: The ozone generator in the ozone ultrasonic reaction tank is an oxygen source ozone generator, and the reaction time is 0.2-1.0h.

7. The method for treating refractory organic wastewater according to claim 5, characterized in that: The ultraviolet oxidation device is an ultraviolet lamp, and the wavelength of ultraviolet light emitted by the ultraviolet lamp is 254nm.

8. The method for treating refractory organic wastewater according to claim 5, characterized in that: The mass concentration of the sodium persulfate is 98%, and the mass concentration of the hydrogen peroxide is 30%.

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