Desulfurization and denitrification sewage environment-friendly treatment system and treatment method thereof

Abstract

The invention belongs to the technical field of sewage treatment, and particularly relates to a desulfurization and denitrification sewage environment-friendly treatment system which comprises a pretreatment unit, a denitrification unit, a desulfurization unit and a deep treatment unit which are connected in sequence, and the pretreatment unit comprises a self-adaptive grid plate which is used for accurately adjusting the grid gap distance according to real-time feedback of a sensor and is used for intercepting impurities; an input port of the grid plate is communicated with a water inlet pipe of a polluted water body; a micro-electrolytic tank for accelerating the degradation of organic matters in the sewage and the conversion of sulfides and nitrides is arranged between the pretreatment unit and the desulfurization unit; the denitrification unit comprises a multi-stage biological denitrification reaction tank for degrading nitrogen-containing organic matters on the surface of a biological membrane filler by utilizing microorganisms; according to the invention, the grid gap spacing can be accurately adjusted according to the real-time feedback of the sensor, large-particle suspended solids and impurities in sewage are effectively intercepted, subsequent treatment equipment is prevented from being blocked by the large-particle suspended solids and impurities, subsequent treatment load fluctuation is reduced, and the manual maintenance cost is greatly reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and in particular relates to a sewage environmental protection treatment system for desulfurization and denitrification and a treatment method thereof. Background Art

[0002] Traditional sewage desulfurization and denitrification treatment technologies have many limitations. Although physical and chemical methods such as chemical precipitation can remove sulfur and nitrogen pollutants to a certain extent, they often require the addition of a large amount of chemical agents, which is costly and prone to secondary pollution. Although biological treatment methods are relatively environmentally friendly, traditional biological denitrification processes often have lengthy process flows, require multiple reaction units in series, occupy a large area, and have poor adaptability to fluctuations in water quality and water volume, and are prone to unstable treatment effects. In addition, some traditional processes find it difficult to achieve efficient and coordinated removal of sulfur and nitrogen pollutants during the treatment process, and often require separate treatment of sulfur and nitrogen at different treatment stages, which not only increases the complexity of the treatment, but also reduces the overall treatment efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide an environmentally friendly sewage treatment system for desulfurization and denitrification and a treatment method thereof, which can accurately adjust the grid gap spacing according to real-time feedback from sensors, effectively intercept large-particle suspended matter and debris in sewage, and can automatically adjust when sewage water quality and water volume fluctuate to ensure a stable interception effect, prevent it from clogging subsequent treatment equipment, reduce subsequent treatment load fluctuations, and greatly reduce manual maintenance costs.

[0005] The technical solution adopted by the present invention is as follows: A wastewater environmental treatment system for desulfurization and denitrification, comprising a pretreatment unit, a denitrification unit, a desulfurization unit and a deep treatment unit connected in sequence, wherein the pretreatment unit comprises an adaptive grid plate for intercepting debris by accurately adjusting the grid gap spacing according to real-time feedback from a sensor, and the input port of the grid plate is connected to the water inlet pipe of the polluted water body; A micro-electrolysis cell is provided between the pretreatment unit and the desulfurization unit for accelerating the degradation of organic matter in the sewage and the conversion of sulfides and nitrides; The denitrification unit comprises a multi-stage biological denitrification reaction tank that utilizes microorganisms to degrade nitrogen-containing organic matter on the surface of a biofilm filler, wherein the multi-stage biological denitrification reaction tank is composed of an anaerobic ammonia oxidation tank, a short-range nitrification tank and a denitrification filter tank connected in series; a flow regulating valve is arranged between each tank of the multi-stage biological denitrification reaction tank, and the sewage residence time is dynamically adjusted according to water quality feedback; the anaerobic ammonia oxidation tank is filled with a volcanic rock-based biological carrier or a hollow fiber membrane biological carrier; a variable frequency aeration disk is arranged at the bottom of the short-range nitrification tank; and a slow-release organic carbon source filter material is filled inside the denitrification filter tank; The desulfurization unit comprises a spray desulfurization tower for sewage desulfurization, wherein the interior of the spray desulfurization tower is sequentially filled with a macroporous adsorption resin layer, an iron-based desulfurization agent layer and an activated carbon fiber layer from bottom to top, and an atomizing spray mechanism is arranged on the top of the spray desulfurization tower, and a cyclone plate is arranged in the spray desulfurization tower to cooperate with the atomizing spray mechanism for high-speed rotary cutting contact between gas and liquid; The deep treatment unit includes an ultrafiltration membrane device for intercepting remaining fine suspended matter and macromolecular organic matter. One side of the ultrafiltration membrane device is connected to a reverse osmosis membrane mechanism for producing clean water for storage and reuse. The reverse osmosis membrane mechanism is connected to the grid plate through a reflux pump and a water pipe.

[0006] The adaptive grid plate includes a square shell, the four inner corners of the square shell are provided with waterproof covers, an adjusting shaft is rotatably installed between the outer walls of the waterproof covers, two adjacent adjusting shafts are vertically arranged, one end of the adjusting shaft extends to the waterproof cover and is fixed with a first bevel gear, the two adjacent first bevel gears are meshed with each other, a waterproof motor is provided on the outer wall of one of the waterproof covers, the output shaft of the waterproof motor is located in the waterproof cover and is fixed with a second bevel gear meshed with the first bevel gear, an annular groove is provided on the outer wall of the middle part of the adjusting shaft, a plurality of variable pitch slide grooves are symmetrically arranged on the outer wall of the adjusting shaft and located on both sides of the annular groove, and the two waterproof A first guide rod is fixed between the outer walls of the water cover and on one side of the adjusting shaft, a plurality of first sliders are slidably mounted on the outer wall of the first guide rod, a protrusion that cooperates with the variable pitch slide groove and the annular groove is fixed on the outer wall of the first slider, a grid bar is fixed between two opposite first sliders in the transverse and longitudinal directions, the grid bars are staggered with each other in the transverse and longitudinal directions to form a grid, a cover plate for protecting the adjusting shaft is provided on one side of the square shell, circular holes are penetrated through the cover plate and one side of the square shell, a plurality of water pressure sensors are provided on the outer wall of the square shell along the circular holes, and the outer surface of the grid bar is covered with a super-hydrophobic nano coating.

[0007] A mounting ring is screwed inside the circular hole, and one side of the mounting ring is provided with interception hairs for intercepting debris from entering the square shell.

[0008] A sealing ring is fixed on the outer wall of the cover plate and located outside the circular hole, an annular mounting groove is opened on the inner side of the sealing ring, a gear ring is rotated inside the annular mounting groove for sealing, the gear ring is located outside the annular mounting groove and a brush cleaning plate is fixed with bolts across the circular hole, the bristles of the brush cleaning plate are in contact with the grille bars, a second motor is arranged in the annular mounting groove, and a third gear meshing with the gear ring is fixed on the output shaft of the second motor.

[0009] The micro-electrolysis cell includes a cell body, a sealing cover is hingedly connected to one side of the top of the cell body, a plurality of cathode plates are arrayed on one side of the interior of the cell body, and a plurality of anode plates matching the cathode plates are arranged on the other side of the interior of the cell body, a mounting groove is provided at the bottom of the cell body, a reciprocating screw is provided inside the mounting groove, a movable plate is screwed on the outer wall of the reciprocating screw, a second guide rod slidably connected to the movable plate is provided inside the mounting groove, a third motor connected to the reciprocating screw is provided on the outside of the cell body, a first rotating shaft is rotatably installed on both sides of the top of the movable plate, a fourth gear is fixed on the outer wall of the first rotating shaft, a second rotating shaft is rotatably installed on the top of the movable plate and located on one side of the first rotating shaft, a fifth gear meshing with the fourth gear is fixed on the outer wall of the second rotating shaft, a sixth gear is fixed on the outer wall of the second rotating shaft and located below the fifth gear, and the diameter of the sixth gear is smaller than the diameter of the fifth gear, and a toothed plate meshing with the fifth gear is fixed inside the mounting groove.

[0010] A mounting plate is fixed on the top of the first rotating shaft, and a plurality of first magnets are arrayed in a circumferential direction on the top of the mounting plate. A sliding plate is slidably mounted on the inner bottom of the pool body, and two circular grooves are provided on the top of the sliding plate. A turntable is rotatably mounted inside the circular groove, and a ball bearing is provided at the rotating connection between the turntable and the circular groove. A plurality of second magnets that are magnetically attracted to the first magnets are arrayed in a circumferential direction on the bottom of the turntable, and a stirring blade is provided on the top of the turntable.

[0011] A second slide groove is provided on both inner sides of the pool body, a second slider is slidably installed inside the second slide groove, a connecting rod fixed to the sliding plate is fixed to one side of the second slider, a fourth magnet is provided at the bottom of the sliding plate, a support block is fixed at the top of the movable plate and located between the two tooth plates, and a third magnet magnetically attracted to the fourth magnet is fixed to the top of the support block.

[0012] Both sides of the bottom of the pool body are provided with drainage chutes for collecting sludge, one side of the pool body is provided with a drainage pipe connected with the drainage chutes for discharging sludge, and both sides of the sliding plate are provided with scrapers for cleaning sludge.

[0013] A high-frequency pulse electric field generator is arranged on the top of the cell body, and a pulse emission head electrically connected to the high-frequency pulse electric field generator is arranged inside the top of the cell body.

[0014] A method for environmentally friendly treatment of wastewater for desulfurization and denitrification comprises the following steps: S1, sewage first enters the adaptive grid in the pretreatment unit, and uses the water pressure sensor to monitor the water inlet in real time. The adaptive grid automatically adjusts the pores to intercept large suspended particles. When the pressure difference reaches the set threshold, the second motor cooperates with the third gear and the gear ring to drive the brush cleaning plate to clean the impurities on the grid, and the sewage flows smoothly into the micro-electrolysis cell; S2, after flowing into the micro-electrolysis cell, adjust the pH value of the sewage to 3, turn on the high-frequency pulse electric field generator, make the pulse transmitter emit pulses, and at the same time, the cathode plate and the anode plate electrolyze the substances in the water. The pulse electric field power is set to 300W, and the reaction time is 60min. The pulse electrode reaction is used to promote the chain breaking of macromolecular organic matter, and the precipitation of sulfides and nitrides. The precipitation situation is monitored by the visual window combined with turbidity, and the mud is discharged in time. After the reaction is completed, the sedimentation takes 30-60min, and the supernatant flows into the multi-stage biological denitrification reaction tank in the denitrification unit by gravity; S3, in the multi-stage biological denitrification reactor, according to the nitrogen composition and concentration of the influent, the hydraulic retention time of each partition is intelligently controlled, the denitrification filter controls the dissolved oxygen below 0.5 mg / L, and the slow-release carbon source functional ball is used to carry out denitrification reaction for 2 hours. Then the sewage enters the anaerobic ammonia oxidation tank, maintains the temperature at 32°C, and uses microorganisms to convert ammonia nitrogen and nitrite nitrogen for anaerobic ammonia oxidation reaction for 3 hours. Finally, it enters the short-range nitrification tank, accurately controls the dissolved oxygen, and carries out short-range nitrification reaction for 4 hours. The nitrogen conversion is monitored throughout the process. During the operation of the biological denitrification reactor, microbial agents are regularly added to the aerobic zone every week. The agents include nitrifying bacteria, denitrifying bacteria and Bacillus, and the addition amount is 50-100g per cubic meter of sewage; The denitrified wastewater of S4 is pumped into the spray desulfurization tower through a lifting pump. The temperature in the tower is controlled at 50°C and the pressure is 0.2MPa. The atomizing spray mechanism is started to cooperate with the upper swirl plate. The atomizing spray mechanism sprays the alkaline absorbent, and the high-speed rotary cutting contact is then used. The macroporous adsorption resin layer, the iron-based desulfurization agent layer and the activated carbon fiber layer are then used to accelerate the oxidation and absorption of sulfur dioxide. The treated tail gas is discharged through the demister, and the liquid flows into the deep treatment unit; and according to the feedback of the sulfur dioxide concentration in the tail gas of the desulfurization tower, the concentration and flow of the spray liquid are adjusted in real time. When the concentration increases by 20%-30%, the concentration of the spray liquid is increased by 0.5%-1%, and the flow rate is increased by 10%-20%; S5, the ultrafiltration membrane components in the deep treatment unit operate at a pressure of 0.2MPa to filter sewage and backwash regularly; the reverse osmosis membrane works at a pressure of 2MPa, the recovery rate is controlled at 65%, and the output clean water is stored and reused; the effluent treated by the deep treatment unit is pumped back to the front end of the pretreatment unit at 10%-20% to dilute the original sewage concentration.

[0015] The technical effects achieved by the present invention are: The pretreatment unit provided in the present invention can accurately adjust the grid gap spacing according to the real-time feedback of the sensor through the synergistic effect of structures such as a waterproof motor, a bevel gear, an adjustment shaft, and a variable pitch slide. This design can effectively remove large-particle suspended matter and debris in sewage to prevent them from clogging subsequent treatment equipment, greatly reducing the fluctuation of subsequent treatment loads and reducing labor maintenance costs. The interception hairs provided can intercept large-particle suspended matter and debris in advance to prevent them from entering the square shell and affecting the normal operation of the equipment. The water pressure sensor can detect the water pressure in real time. When the pressure difference reaches the set threshold, the brush cleaning plate is automatically started to clean the impurities on the grid plate to maintain smooth and stable water flow. The super-hydrophobic nano-coating on the outer surface of the grid bars can reduce the adhesion of impurities on the grid bars, further improve the cleaning effect, and ensure the efficient operation of the grid.

[0016] The micro-electrolysis cell provided in the present invention electrolyzes substances in water through cathode plates and anode plates, cooperates with a high-frequency pulse electric field generator and a pulse transmitter, utilizes the energy released by pulse electrode reaction, promotes chain breaking of macromolecular organic matter, precipitation of sulfides and nitrides, and significantly improves the conversion efficiency of pollutants in sewage; the third motor drives the reciprocating screw to rotate, and then drives a series of structural movements such as the moving plate, the support block, and the magnet to realize the reciprocating movement and rotation of the stirring blade, so that the sewage is fully in contact with the cathode plate and the anode plate, and the treatment effect is improved; at the same time, during the movement of the sliding plate, the scraper pushes the sediment into the sewage chute and discharges it through the sewage pipe, thereby realizing the automation of sludge cleaning; The ultrafiltration membrane device in the deep processing unit provided in the present invention can intercept the remaining fine suspended matter and macromolecular organic matter, and then produce clean water for storage and reuse through the reverse osmosis membrane mechanism, thereby improving the utilization rate of water resources; at the same time, the reverse osmosis membrane mechanism is connected to the grid plate through a reflux pump in conjunction with a water pipe, thereby realizing the recycling of water resources and further improving the environmental protection and economic benefits of the system.

[0017] The multi-stage biological denitrification reaction tank provided by the present invention is composed of an anaerobic ammonia oxidation tank, a short-range nitrification tank and a denitrification filter tank connected in series, and utilizes microorganisms to degrade nitrogen-containing organic matter on the surface of the biofilm filler; different tank bodies are filled with different carriers or filter materials, and flow regulating valves are provided between the tanks, which can dynamically adjust the sewage residence time according to water quality feedback, thereby realizing efficient denitrification treatment of sewage with different water qualities. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a process flow chart of the environmentally friendly sewage treatment method for desulfurization and denitrification of the present invention; Figure 2 is a schematic diagram of the front view of the three-dimensional structure of the adaptive grid plate of the present invention; Figure 3 is a rear-view stereoscopic structural schematic diagram of the adaptive grid plate of the present invention; Figure 4It is a three-dimensional structural schematic diagram of the internal structure of the adaptive grid plate of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the interception hair of the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the brush cleaning plate of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the sealing ring of the present invention; Figure 8 The present invention Figure 4 A schematic diagram of the enlarged structure of the middle A area; Fig. 9 It is a schematic diagram of the front three-dimensional structure of the micro-electrolytic cell of the present invention; Fig.10 It is a schematic diagram of the three-dimensional structure of the micro-electrolytic cell of the present invention when viewed from above; Fig.11 It is a top view of the three-dimensional structure of the micro-electrolytic cell of the present invention; Fig.12 It is a schematic diagram of the three-dimensional structure of the reciprocating screw rod of the present invention; Fig.13 It is a schematic diagram of the three-dimensional structure of the mounting plate and the first magnet of the present invention; Fig.14 It is a schematic diagram of the three-dimensional structure of the stirring blade of the present invention; Fig.15 It is a schematic diagram of the front view structure of the sliding plate of the present invention; Fig.16 is a schematic diagram of the three-dimensional structure of the sliding plate of the present invention when viewed from above; Fig.17 It is a schematic diagram of the structure of the pulse transmitter of the present invention; Fig.18 It is a schematic diagram of the environmentally friendly sewage treatment system for desulfurization and denitrification of the present invention.

[0019] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Square housing; 2. Adjusting shaft; 3. Waterproof cover; 4. First bevel gear; 5. Waterproof motor; 6. Second bevel gear; 7. Pitch-changing slide; 8. First guide rod; 9. First slider; 10. Bump; 11. Grille bar; 12. Cover plate; 13. Water pressure sensor; 14. Mounting ring; 15. Intercepting hair; 16. Sealing ring; 17. Gear ring; 18. Brush cleaning plate; 19. Second motor; 20. Third gear; 03. Pool body; 31. Reciprocating screw rod; 32. Moving plate; 33. Third motor; 34. Second guide rod; 35. First shaft; 36. Fourth gear; 37. Mounting plate; 38. First magnet; 39. Second shaft Shaft; 310, fifth gear; 311, sixth gear; 312, tooth plate; 313, sliding plate; 314, circular groove; 315, turntable; 316, second magnet; 317, ball; 318, stirring blade; 41, second slider; 42, support block; 43, third magnet; 44, fourth magnet; 45, second slide; 51, high-frequency pulse electric field generator; 52, pulse transmitter; 61, sealing cover; 71, sewage pipe; 72, sewage chute; 73, scraper; 81, cathode plate; 82, anode plate; 01 grid plate; 02, multi-stage biological denitrification reaction tank; 03, tank body; 04, spray desulfurization tower; 05, ultrafiltration membrane device. DETAILED DESCRIPTION

[0020] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific embodiments of the present invention, and does not strictly limit the scope of protection of the specific claims of the present invention.

[0021] like Figure 1-Figure 8 As shown, a wastewater environmental treatment system for desulfurization and denitrification includes a pretreatment unit, a denitrification unit, a desulfurization unit and a deep treatment unit connected in sequence. The pretreatment unit includes an adaptive grid plate for intercepting debris by accurately adjusting the grid gap spacing according to real-time feedback from the sensor, and the input port of the grid plate is connected to the water inlet pipe of the polluted water body; the adaptive grid plate includes a square shell 1, and a waterproof cover 3 is arranged at the four corners inside the square shell 1, and an adjusting shaft 2 is rotatably installed between the outer walls of the waterproof cover 3, and two adjacent adjusting shafts 2 are arranged vertically, and one end of the adjusting shaft 2 extends to the waterproof cover 3 and is fixed with a first bevel gear 4, and the two adjacent first bevel gears 4 are meshed with each other, and a waterproof motor 5 is arranged on the outer wall of one of the waterproof covers 3, and the output shaft of the waterproof motor 5 is located in the waterproof cover 3 and is fixed with a second bevel gear 6 meshing with the first bevel gear 4, and an annular groove is arranged on the outer wall of the middle part of the adjusting shaft 2, and a plurality of variable pitch chute 7 are symmetrically arranged on the outer wall of the adjusting shaft 2 and located on both sides of the annular groove, and a first guide rod 8 is fixed between the outer walls of the two waterproof covers 3 and located on one side of the adjusting shaft 2, and a plurality of first sliders 9 are slidably installed on the outer wall of the first guide rod 8, and a convex block 10 cooperating with the variable pitch chute 7 and the annular groove is fixed on the outer wall of the first slider 9, A grid bar 11 is fixed between two first sliders 9 facing each other in the horizontal direction and in the vertical direction. The grid bars 11 are arranged in an interlaced manner to form a grid. A cover plate 12 for protecting the adjustment shaft 2 is arranged on one side of the square housing 1. A circular hole is provided through the cover plate 12 and one side of the square housing 1. A plurality of water pressure sensors 13 are arranged along the circular hole on the outer wall of the square housing 1. The outer surface of the grid bar 11 is covered with a super-hydrophobic nano coating. A mounting ring 14 is screwed inside the circular hole. A mounting ring 14 is arranged on one side of the mounting ring 14 for intercepting impurities. The intercepting hair 15 prevents the objects from entering the square housing 1; a sealing ring 16 is fixed on the outer wall of the cover plate 12 and located outside the circular hole, an annular mounting groove is provided inside the sealing ring 16, a gear ring 17 is provided inside the annular mounting groove for sealing rotation, the gear ring 17 is located outside the annular mounting groove and a brush cleaning plate 18 is fixed across the circular hole bolts, the bristles of the brush cleaning plate 18 are in contact with the grille bar 11, a second motor 19 is provided in the annular mounting groove, and a third gear 20 meshing with the gear ring 17 is fixed on the output shaft of the second motor 19; According to the above structure, the waterproof motor 5 is started, the waterproof motor 5 drives the second bevel gear 6 to rotate, the second bevel gear 6 drives the second bevel gear 6 to rotate, the second bevel gear 6 drives one of the first bevel gears 4 to rotate, the first bevel gear 4 drives the adjacent first bevel gear 4 to rotate and drives the corresponding adjusting shaft 2 to rotate, because the two adjacent first bevel gears 4 are meshed with each other, thereby driving all the adjusting shafts 2 to rotate, the adjusting shaft 2 drives the annular groove and the variable pitch slide groove 7 to rotate, the variable pitch slide groove 7 drives the corresponding convex block 10 to move, the convex block 10 drives the first slider 9 to move, the first slider 9 drives the corresponding grille bar 11 to move, and the grille gap spacing of the grille plate is adjusted according to needs. The structure is simple and the operation is convenient. It is convenient to effectively remove large suspended solids and debris in sewage, prevent them from clogging subsequent treatment equipment, reduce subsequent treatment load fluctuations, and greatly reduce labor maintenance costs; the interception hair 15 can intercept large suspended solids and debris to prevent them from entering the square housing 1 and affecting the normal use of the equipment. The water pressure sensor 13 detects the water pressure flowing through the grid plate. When the pressure difference reaches the set threshold, the second motor 19 starts, the second motor 19 drives the third gear 20 to rotate, the third gear 20 drives the gear ring 17 to rotate, and the gear ring 17 drives the brush cleaning plate 18 to rotate. The brush cleaning plate 18 can clean the impurities on the grid plate and maintain the smooth and stable water flow; like Figure 9-Figure 17 As shown, a micro-electrolysis cell is arranged between the pretreatment unit and the desulfurization unit for accelerating the degradation of organic matter in sewage and the conversion of sulfides and nitrides. The frequency range of the high-frequency pulse electric field generator is 50-100kHz, and the voltage amplitude is 10-30kV. The wall of the micro-electrolysis cell adopts a double-layer sound insulation and shock absorption structure, with the inner layer being sound-absorbing rubber and the outer layer being a damping alloy plate. The micro-electrolysis cell comprises a cell body 03, a sealing cover 61 is hinged on one side of the top of the cell body 03, a plurality of cathode plates 81 are arrayed on one side of the interior of the cell body 03, a plurality of anode plates 82 cooperating with the cathode plates 81 are arrayed on the other side of the interior of the cell body 03, a mounting groove is arranged at the bottom of the cell body 03, a reciprocating screw rod 31 is arranged inside the mounting groove, a moving plate 32 is screwed on the outer wall of the reciprocating screw rod 31, a second guide rod 34 slidably connected to the moving plate 32 is arranged inside the mounting groove, a third motor 33 connected to the reciprocating screw rod 31 is arranged outside the cell body 03, A first rotating shaft 35 is rotatably mounted on both sides of the top of the moving plate 32, a fourth gear 36 is fixed to the outer wall of the first rotating shaft 35, a second rotating shaft 39 is rotatably mounted on the top of the moving plate 32 and located on one side of the first rotating shaft 35, a fifth gear 310 meshing with the fourth gear 36 is fixed to the outer wall of the second rotating shaft 39, a sixth gear 311 is fixed to the outer wall of the second rotating shaft 39 and located below the fifth gear 310, and the diameter of the sixth gear 311 is smaller than the diameter of the fifth gear 310, and a toothed plate 312 meshing with the fifth gear 310 is fixed inside the mounting groove; A mounting plate 37 is fixed on the top of the first rotating shaft 35, and a plurality of first magnets 38 are arranged in a circumferential direction on the top of the mounting plate 37. A sliding plate 313 is slidably mounted on the inner bottom of the pool body 03, and two circular grooves 314 are provided on the top of the sliding plate 313. A rotating disk 315 is rotatably mounted inside the circular groove 314, and a ball bearing 317 is provided at the rotating connection between the rotating disk 315 and the circular groove 314. A plurality of second magnets 316 magnetically attracted to the first magnets 38 are arranged in a circumferential direction on the bottom of the rotating disk 315, and a stirring blade 318 is provided on the top of the rotating disk 315; A second slide groove 45 is provided on both inner sides of the pool body 03, a second slider 41 is slidably installed inside the second slide groove 45, a connecting rod fixed to the sliding plate 313 is fixed on one side of the second slider 41, a fourth magnet 44 is provided at the bottom of the sliding plate 313, a support block 42 is fixed on the top of the movable plate 32 and located between the two tooth plates 312, a third magnet 43 magnetically attracted to the fourth magnet 44 is fixed on the top of the support block 42; sewage chute 72 for sludge collection is provided on both sides of the bottom of the pool body 03, a sewage pipe 71 connected to the sewage chute 72 is provided on one side of the pool body 03 for sludge discharge, and scrapers 73 for sludge cleaning are provided on both sides of the sliding plate 313; a high-frequency pulse electric field generator 51 is provided on the top of the pool body 03, and a pulse transmitter 52 electrically connected to the high-frequency pulse electric field generator 51 is provided on the top of the pool body 03; According to the above structure, the substances in the water are electrolyzed by the cathode plate 81 and the anode plate 82, and the high-frequency pulse electric field generator 51 and the pulse emission head 52 are set, and the energy released by the pulse electrode reaction is used to promote the chain breaking of macromolecular organic matter, the precipitation of sulfides and nitrides, and significantly improve the conversion efficiency of pollutants in sewage; then the third motor 33 is started, and the third motor 33 drives the reciprocating screw rod 31 to rotate, and the reciprocating screw rod 31 drives the moving plate 32 to move back and forth, and the moving plate 32 drives the third magnet 43 on the support block 42 to move, and the third magnet 43 and the fourth magnet 44 are attracted by the same poles, and drive the fourth magnet 44 to move, and the fourth magnet 44 drives the sliding plate 313 to move, and the sliding plate 313 drives the stirring blade 318 to move back and forth, and the stirring blade 318 is moved back and forth. When the sixth gear 311 cooperates with the toothed plate 312 during the movement, driving the sixth gear 311 to rotate, the sixth gear 311 drives the fifth gear 310 to rotate through the second rotating shaft 39, the fifth gear 310 meshes with the fourth gear 36, driving the first magnet 38 on the mounting plate 37 to rotate, and then through the magnetic force of the first magnet 38 and the second magnet 316, the turntable 315 is driven to rotate, and the turntable 315 drives the stirring blade 318 to rotate, thereby stirring the sewage in the pool body 03, so that the sewage can fully contact with the cathode plate 81 and the anode plate 82, thereby improving the sewage treatment effect; during the movement of the sliding plate 313, the scraper 73 is driven to move, and the scraper 73 pushes the sediment into the sewage chute 72, and finally it can be discharged through the sewage pipe 71; The denitrification unit includes a multi-stage biological denitrification reaction tank 02 that utilizes microorganisms to degrade nitrogen-containing organic matter on the surface of biofilm fillers. The multi-stage biological denitrification reaction tank 02 is composed of an anaerobic ammonia oxidation tank, a short-range nitrification tank, and a denitrification filter tank connected in series; the anaerobic ammonia oxidation tank is filled with volcanic rock-based biological carriers or hollow fiber membrane biological carriers, a variable frequency aeration disk is provided at the bottom of the short-range nitrification tank, and a slow-release organic carbon source filter material is filled inside the denitrification filter tank; flow regulating valves are provided between each tank of the multi-stage biological denitrification reaction tank 02 to dynamically adjust the sewage retention time according to water quality feedback, and the hydraulic retention time of the anaerobic ammonia oxidation tank, the short-range nitrification tank, and the denitrification filter tank can be flexibly adjusted to 1-3h, 2-4h, and 3-5h; The desulfurization unit includes a spray desulfurization tower 04 for wastewater desulfurization. The interior of the spray desulfurization tower 04 is filled with a macroporous adsorption resin layer, an iron-based desulfurization agent layer and an activated carbon fiber layer from bottom to top. The top of the spray desulfurization tower 04 is provided with an atomizing spray mechanism. A cyclone plate is provided in the spray desulfurization tower 04 to cooperate with the atomizing spray mechanism for high-speed rotary cutting contact between gas and liquid. The deep treatment unit includes an ultrafiltration membrane device 05 for intercepting remaining fine suspended matter and macromolecular organic matter. One side of the ultrafiltration membrane device 05 is connected to a reverse osmosis membrane mechanism for producing clean water for storage and reuse. The reverse osmosis membrane mechanism is connected to the grid plate through a reflux pump and a water pipe.

[0022] like Figure 1 and Fig.18 As shown, a method for environmentally friendly treatment of wastewater for desulfurization and denitrification comprises the following steps: S1, sewage first enters the adaptive grid plate in the pretreatment unit, and the water pressure sensor 13 is used to monitor the water inlet status in real time. The adaptive grid plate automatically adjusts the aperture. For example, when the suspended matter in the sewage increases and the water pressure increases, the grid plate will accurately expand the grid gap spacing to ensure that large particles of suspended matter can be effectively intercepted while maintaining the smooth and stable water flow; when the pressure difference reaches the set threshold, the second motor 19 cooperates with the third gear 20 and the gear ring 17 to drive the brush cleaning plate 18 to clean the impurities on the grid plate to prevent the debris from clogging the grid gap, and the sewage flows smoothly into the micro-electrolysis cell; S2, after flowing into the micro-electrolysis cell, adjust the pH value of the sewage to 3, turn on the high-frequency pulse electric field generator 51, and make the pulse transmitter 52 emit pulses. At the same time, the cathode plate 81 and the anode plate 82 electrolyze the substances in the water. The pulse electric field power is set to 300W, and the reaction time is 60min. The pulse electrode reaction is used to promote the chain breaking of macromolecular organic matter, and the precipitation of sulfides and nitrides. The precipitation situation is monitored by the visual window combined with turbidity, and the mud is discharged in time. After the reaction is completed, the sedimentation takes 30-60min, and the supernatant flows into the multi-stage biological denitrification reaction tank 02 in the denitrification unit by gravity; S3, in the multi-stage biological denitrification reaction pool 02, according to the detailed detection data of the nitrogen composition and concentration of the influent, the hydraulic retention time of each partition is intelligently adjusted. The sewage first enters the denitrification filter tank, in which the dissolved oxygen is strictly controlled to be lower than 0.5mg / L, and the slow-release carbon source functional ball is used to provide sufficient carbon source for the denitrification reaction. The denitrification reaction lasts for 2 hours; then, the sewage flows into the anaerobic ammonia oxidation tank, and the temperature in the tank is accurately maintained at 32℃. Under the action of microorganisms, ammonia nitrogen and nitrite nitrogen are efficiently converted, and the anaerobic ammonia oxidation reaction lasts for 3 hours; finally, The sewage enters the short-range nitrification tank, and the dissolved oxygen level is precisely controlled by the variable frequency aeration disk to carry out the short-range nitrification reaction for 4 hours. During the entire denitrification process, advanced monitoring equipment is used to monitor the nitrogen conversion in real time, and the reaction parameters are adjusted in time to ensure that the denitrification effect is stable and reliable, and the total nitrogen removal rate reaches a high level. During the operation of the biological denitrification reaction tank, microbial agents are regularly added to the aerobic zone every week. The agents include nitrifying bacteria, denitrifying bacteria and Bacillus, and the addition amount is 50-100g per cubic meter of sewage to enhance the biological denitrification effect. S4, the wastewater after denitrification is pumped into the spray desulfurization tower 04 through the lifting pump. After entering the tower, the temperature in the tower is first accurately controlled at 50℃ and the pressure is stabilized at 0.2MPa. At this time, the atomizing spray mechanism is started, and the swirl plate is used to make the gas and liquid contact at high speed. The atomizing spray mechanism evenly sprays the alkaline absorbent to react chemically with the sulfur dioxide in the wastewater. In this process, the macroporous adsorption resin layer, the iron-based desulfurizer layer and the activated carbon fiber layer work together to accelerate the oxidation and absorption process of sulfur dioxide. The treated tail gas is discharged through the demister and meets the emission standards, and the liquid flows into the deep treatment unit. According to the feedback of the sulfur dioxide concentration in the tail gas of the desulfurization tower, the concentration and flow of the spray liquid are adjusted in real time. For example, when the sulfur dioxide concentration in the tail gas increases by 20%-30%, the system will quickly increase the concentration of the spray liquid by 0.5%-1%, and increase the flow by 10%-20% to ensure that the desulfurization effect is always stable and meets the standards. S5, the ultrafiltration membrane assembly in the deep treatment unit operates at a pressure of 0.2MPa to filter sewage and backwash regularly to remove dirt and impurities on the membrane surface to ensure the filtration efficiency and service life of the ultrafiltration membrane; the reverse osmosis membrane works at a pressure of 2MPa, the recovery rate is controlled at 65%, and the output clean water is stored and reused; 10%-20% of the effluent treated by the deep treatment unit is pumped back to the front end of the pretreatment unit to dilute the raw sewage concentration, reduce the concentration impact of pollutants in the raw sewage, and improve the stability and impact resistance of the entire treatment system.

[0023] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims

1. A wastewater environmental treatment system for desulfurization and denitrification, comprising a pretreatment unit, a denitrification unit, a desulfurization unit and a deep treatment unit connected in sequence, characterized in that: The pre-processing unit comprises an adaptive grid plate (01) for accurately adjusting the grid gap spacing according to real-time feedback from a sensor to intercept debris, and the input port of the grid plate (01) is connected to the water inlet pipe of the polluted water body; A micro-electrolysis cell is provided between the pretreatment unit and the desulfurization unit for accelerating the degradation of organic matter in the sewage and the conversion of sulfides and nitrides; The denitrification unit comprises a multi-stage biological denitrification reaction tank (02) for utilizing microorganisms to degrade nitrogen-containing organic matter on the surface of a biofilm filler, wherein the multi-stage biological denitrification reaction tank (02) is composed of an anaerobic ammonia oxidation tank, a short-range nitrification tank and a denitrification filter tank connected in series; a flow regulating valve is arranged between each tank of the multi-stage biological denitrification reaction tank (02) to dynamically adjust the sewage retention time according to water quality feedback; the anaerobic ammonia oxidation tank is filled with a volcanic rock-based biological carrier or a hollow fiber membrane biological carrier; a variable frequency aeration disk is arranged at the bottom of the short-range nitrification tank; and a slow-release organic carbon source filter material is filled inside the denitrification filter tank; The desulfurization unit comprises a spray desulfurization tower (04) for wastewater desulfurization, wherein the interior of the spray desulfurization tower (04) is filled with a macroporous adsorption resin layer, an iron-based desulfurization agent layer and an activated carbon fiber layer in order from bottom to top, an atomizing spray mechanism is arranged on the top of the spray desulfurization tower (04), and a cyclone plate is arranged in the spray desulfurization tower (04) for high-speed rotary cutting contact between gas and liquid in cooperation with the atomizing spray mechanism; The deep treatment unit comprises an ultrafiltration membrane device (05) for intercepting residual fine suspended matter and macromolecular organic matter, one side of the ultrafiltration membrane device (05) is connected to a reverse osmosis membrane mechanism for producing clean water for storage and reuse, and the reverse osmosis membrane mechanism is connected to the grid plate through a reflux pump and a water pipe.

2. A wastewater environmental treatment system for desulfurization and denitrification according to claim 1, characterized in that: The adaptive grid plate comprises a square shell (1), wherein the four corners of the square shell (1) are provided with waterproof covers (3), an adjustment shaft (2) is rotatably mounted between the outer walls of the waterproof covers (3), two adjacent adjustment shafts (2) are arranged vertically, one end of the adjustment shaft (2) extends into the waterproof cover (3) and is fixed with a first bevel gear (4), the two adjacent first bevel gears (4) are meshed with each other, a waterproof motor (5) is arranged on the outer wall of one of the waterproof covers (3), the output shaft of the waterproof motor (5) is located in the waterproof cover (3) and is fixed with a second bevel gear (6) meshing with the first bevel gear (4), an annular groove is arranged on the middle outer wall of the adjustment shaft (2), a plurality of variable pitch slide grooves (7) are symmetrically arranged on the outer wall of the adjustment shaft (2) and located on both sides of the annular groove, and the two waterproof covers ( A first guide rod (8) is fixed between the outer walls of the square housing (1) and located on one side of the adjustment shaft (2); a plurality of first sliders (9) are slidably mounted on the outer wall of the first guide rod (8); a protrusion (10) that cooperates with the variable pitch slide groove (7) and the annular groove is fixed on the outer wall of the first slider (9); a grid bar (11) is fixed between two first sliders (9) that are opposite to each other in the transverse and longitudinal directions; the grid bars (11) are staggered in the transverse and longitudinal directions to form a grid; a cover plate (12) that can protect the adjustment shaft (2) is provided on one side of the square housing (1); a circular hole is formed through the cover plate (12) and one side of the square housing (1); a plurality of water pressure sensors (13) are provided on the outer wall of the square housing (1) along the circular hole; and the outer surface of the grid bar (11) is covered with a super-hydrophobic nano coating.

3. A wastewater environmental treatment system for desulfurization and denitrification according to claim 2, characterized in that: A mounting ring (14) is screwed into the interior of the circular hole, and one side of the mounting ring (14) is provided with interception hairs (15) for intercepting debris from entering the square housing (1).

4. A wastewater environmental treatment system for desulfurization and denitrification according to claim 2, characterized in that: A sealing ring (16) is fixed on the outer wall of the cover plate (12) and located outside the circular hole. An annular mounting groove is provided on the inner side of the sealing ring (16). A gear ring (17) is provided inside the annular mounting groove for sealing rotation. The gear ring (17) is located outside the annular mounting groove and is bolted with a brush cleaning plate (18) across the circular hole. The bristles of the brush cleaning plate (18) are in contact with the grille bars (11). A second motor (19) is provided in the annular mounting groove. A third gear (20) meshing with the gear ring (17) is fixed to the output shaft of the second motor (19).

5. The environmentally friendly sewage treatment system for desulfurization and denitrification according to claim 1 is characterized by: The micro-electrolysis cell comprises a cell body (03), a sealing cover (61) is hingedly connected to one side of the top of the cell body (03), a plurality of cathode plates (81) are arrayed on one side of the interior of the cell body (03), a plurality of anode plates (82) cooperating with the cathode plates (81) are arrayed on the other side of the interior of the cell body (03), a mounting groove is arranged at the bottom of the cell body (03), a reciprocating screw rod (31) is arranged inside the mounting groove, a moving plate (32) is screwed to the outer wall of the reciprocating screw rod (31), a second guide rod (34) slidably connected to the moving plate (32) is arranged inside the mounting groove, and a third motor (34) connected to the reciprocating screw rod (31) is arranged outside the cell body (03). 3), first rotating shafts (35) are rotatably mounted on both sides of the top of the movable plate (32), a fourth gear (36) is fixed to the outer wall of the first rotating shaft (35), a second rotating shaft (39) is rotatably mounted on the top of the movable plate (32) and located on one side of the first rotating shaft (35), a fifth gear (310) meshing with the fourth gear (36) is fixed to the outer wall of the second rotating shaft (39), a sixth gear (311) is fixed to the outer wall of the second rotating shaft (39) and located below the fifth gear (310), and the diameter of the sixth gear (311) is smaller than the diameter of the fifth gear (310), and a toothed plate (312) meshing with the fifth gear (310) is fixed inside the mounting groove.

6. A wastewater environmental treatment system for desulfurization and denitrification according to claim 5, characterized in that: A mounting plate (37) is fixed on the top of the first rotating shaft (35), and a plurality of first magnets (38) are arranged in an array along a circumferential direction on the top of the mounting plate (37). A sliding plate (313) is slidably mounted on the inner bottom of the pool body (03), and two circular grooves (314) are provided on the top of the sliding plate (313). A rotating disk (315) is rotatably mounted inside the circular groove (314), and a ball bearing (317) is provided at the rotating connection between the rotating disk (315) and the circular groove (314). A plurality of second magnets (316) magnetically attracted to the first magnets (38) are arranged in an array along a circumferential direction on the bottom of the rotating disk (315), and a stirring blade (318) is provided on the top of the rotating disk (315).

7. A wastewater environmental treatment system for desulfurization and denitrification according to claim 5, characterized in that: Second slide grooves (45) are provided on both inner sides of the pool body (03); a second slider (41) is slidably mounted inside the second slide groove (45); a connecting rod fixed to a sliding plate (313) is fixed to one side of the second slider (41); a fourth magnet (44) is provided at the bottom of the sliding plate (313); a support block (42) is fixed at the top of the movable plate (32) and located between the two tooth plates (312); a third magnet (43) magnetically attracted to the fourth magnet (44) is fixed to the top of the support block (42).

8. The environmentally friendly sewage treatment system for desulfurization and denitrification according to claim 5 is characterized by: Both sides of the bottom of the tank body (03) are provided with sewage chute (72) for collecting sludge, one side of the tank body (03) is provided with a sewage pipe (71) connected with the sewage chute (72) for discharging sludge, and both sides of the sliding plate (313) are provided with scrapers (73) for cleaning sludge.

9. A wastewater environmental treatment system for desulfurization and denitrification according to claim 5, characterized in that: A high-frequency pulse electric field generator (51) is arranged on the top of the cell body (03), and a pulse emission head (52) electrically connected to the high-frequency pulse electric field generator (51) is arranged on the top of the cell body (03).

10. A method for environmentally friendly treatment of wastewater by desulfurization and denitrification, using the environmentally friendly treatment system for wastewater by desulfurization and denitrification according to any one of claims 1 to 9, characterized in that: The steps include: S1, sewage first enters the adaptive grid plate in the pretreatment unit, and the water pressure sensor (13) monitors the water inflow in real time. The adaptive grid plate automatically adjusts the pores to intercept large suspended particles. When the pressure difference reaches a set threshold, the second motor (19) cooperates with the third gear (20) and the gear ring (17) to drive the brush cleaning plate (18) to clean the impurities on the grid plate, and the sewage flows smoothly into the micro-electrolysis cell; S2, after flowing into the micro-electrolysis cell, adjusts the pH value of the sewage to 3, turns on the high-frequency pulse electric field generator (51), and causes the pulse transmitter (52) to emit pulses. At the same time, the cathode plate (81) and the anode plate (82) perform electrolytic reactions on the substances in the water. The pulse electric field power is set to 300W, and the reaction time is 60 minutes. The pulse electrode reaction is used to promote the chain breaking of macromolecular organic matter, and the precipitation of sulfides and nitrides. The precipitation situation is monitored by the visual window combined with turbidity, and the mud is discharged in time. After the reaction is completed, the sedimentation takes 30-60 minutes, and the supernatant flows by gravity into the multi-stage biological denitrification reaction tank (02) in the denitrification unit; S3, in the multi-stage biological denitrification reactor (02), the hydraulic retention time of each zone is intelligently controlled according to the nitrogen composition and concentration of the influent. The denitrification filter controls the dissolved oxygen to be less than 0.5 mg / L, and the slow-release carbon source functional ball is used to carry out the denitrification reaction for 2 hours. Then the sewage enters the anaerobic ammonia oxidation tank, maintains the temperature at 32°C, and uses microorganisms to convert ammonia nitrogen and nitrite nitrogen to carry out anaerobic ammonia oxidation reaction for 3 hours. Finally, it enters the short-range nitrification tank, accurately controls the dissolved oxygen, carries out the short-range nitrification reaction for 4 hours, and monitors the nitrogen conversion throughout the process. During the operation of the biological denitrification reactor, microbial agents are regularly added to the aerobic zone every week. The agents include nitrifying bacteria, denitrifying bacteria and Bacillus, and the addition amount is 50-100g per cubic meter of sewage; S4, the wastewater after denitrification is pumped into the spray desulfurization tower (04) through a lifting pump, and the temperature in the tower is controlled at 50°C and the pressure is 0.2MPa. The atomizing spray mechanism is started to cooperate with the upper swirl plate, and the atomizing spray mechanism sprays the alkaline absorbent, and the high-speed rotary cutting contact is then used. The macroporous adsorption resin layer, the iron-based desulfurization agent layer and the activated carbon fiber layer are then used to accelerate the oxidation and absorption of sulfur dioxide. The treated tail gas is discharged through the demister, and the liquid flows into the deep treatment unit; and according to the feedback of the sulfur dioxide concentration in the tail gas of the desulfurization tower, the concentration and flow of the spray liquid are adjusted in real time. When the concentration increases by 20%-30%, the concentration of the spray liquid is increased by 0.5%-1%, and the flow rate is increased by 10%-20%; S5, the ultrafiltration membrane components in the deep treatment unit operate at a pressure of 0.2MPa to filter sewage and backwash regularly; the reverse osmosis membrane works at a pressure of 2MPa, the recovery rate is controlled at 65%, and the output clean water is stored and reused; the effluent treated by the deep treatment unit is pumped back to the front end of the pretreatment unit at 10%-20% to dilute the original sewage concentration.

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