Intelligent town sewage treatment system

Abstract

The invention provides an intelligent town sewage treatment system which comprises a filter tank, a coarse screen filter device and a fine screen filter device are arranged in the filter tank, a vortex sedimentation tank is arranged in the outlet direction of the filter tank, and an oil stain separation tank is arranged on one side outside the vortex sedimentation tank. An oil foam discharging device is transversely arranged at the upper end of the oil stain separation tank, a biochemical reaction tank is arranged on one side outside the oil stain separation tank, the interior of the biochemical reaction tank is divided into an ammonification reaction zone, a nitration reaction zone and a denitrification reaction zone which are communicated in sequence, and a sludge separation tank is arranged on one side outside the biochemical reaction tank close to the denitrification reaction zone; a negative pressure pipe is transversely arranged in the sludge separation tank, the negative pressure pipe is communicated with a plurality of porous supporting pipes which are horizontally arranged, an ultrafiltration membrane sleeve is sleeved outside each porous supporting pipe, and a sludge selection tank is arranged on one side outside the sludge separation tank. The sewage treatment system disclosed by the invention can effectively separate sludge from water, effectively improve the elimination speed of filamentous bacteria and effectively solve the problem of sludge bulking.

Description

Technical Field

[0001] The invention belongs to the technical field of urban sewage treatment and relates to an intelligent urban sewage treatment system. Background Art

[0002] Urban sewage treatment is an important part of modern urban infrastructure, which aims to remove pollutants from sewage to meet discharge standards or reuse standards. With the acceleration of urbanization, the amount of urban sewage is increasing, and the importance of sewage treatment is becoming more prominent. Traditional urban sewage treatment methods mainly include physical treatment, chemical treatment and biological treatment. Among them, biological treatment is one of the most commonly used and effective treatment methods, especially the activated sludge method, which has been widely used worldwide due to its efficient organic matter removal ability.

[0003] The basic principle of the activated sludge process is to biodegrade organic pollutants in sewage through microbial communities (activated sludge). These microbial communities usually include bacteria, fungi and other protozoa, which grow under aerobic conditions and decompose organic matter in the water. The core components of the activated sludge system include primary sedimentation tanks, aeration tanks and secondary sedimentation tanks. The sewage first enters the primary sedimentation tank to remove larger particles, and then enters the aeration tank. During this process, air is introduced into the water through the aeration equipment to ensure sufficient dissolved oxygen (DO) supply and promote microbial metabolism. Finally, the treated mixed liquor enters the secondary sedimentation tank, where the activated sludge is settled by gravity and separated from the treated clean water.

[0004] However, in the actual sewage treatment process, some challenges are often encountered. Due to insufficient dissolved oxygen, excessive aeration or low organic load, the nutrient source of microbial species in the water lacks iron. When this happens, the original beneficial bacteria may transform into Microfilamentous Bacteria. Microfilamentous bacteria are a type of bacteria with a special morphology. Their excessive proliferation in activated sludge can cause the sludge structure to become loose and lose its original flocculation ability, which in turn causes the so-called "sludge bulking" problem. Once the activated sludge swells, its sedimentation performance will drop significantly, making it difficult to separate mud and water, or even completely unable to separate. This will not only cause a large amount of activated sludge to be lost, affecting the normal operation of the treatment system, but will also cause the treated water quality to deteriorate and fail to meet the discharge standards. Summary of the invention

[0005] The object of the present invention is to provide an intelligent urban sewage treatment system, which can effectively separate sludge from water, effectively increase the elimination rate of filamentous bacteria, and effectively deal with the problem of sludge swelling.

[0006] To solve the above technical problems, the present invention provides an intelligent urban sewage treatment system, including a filter tank, wherein a coarse grid filter device and a fine grid filter device are arranged in the filter tank, a vortex sedimentation tank is arranged in the outlet direction of the filter tank, a lifting pump is arranged between the filter tank and the vortex sedimentation tank, one side of the upper end of the vortex sedimentation tank is connected with a section inlet channel arranged along its section direction, and one side of the upper end of the vortex sedimentation tank away from the section inlet channel is provided with a section outlet channel along its section direction, the inlet end of the lifting pump extends into the outlet of the filter tank through a first liquid suction pipe, the outlet end of the lifting pump is connected with the section inlet channel through a first liquid discharge pipe, the bottom of the vortex sedimentation tank is connected with a sediment output channel arranged obliquely upward, a spiral sedimentation conveying rod is rotatably connected in the sediment output channel, a sediment discharge motor for driving the spiral sedimentation conveying rod to rotate is installed at the free end of the sediment output channel, and a sediment discharge port is opened at the upper end of the sediment output channel;

[0007] An oil separation tank is arranged on one side outside the vortex sedimentation tank, and the oil separation tank is divided into a flotation aeration zone and a foam discharge zone which are connected in a U-shape, and the free end of the section outlet channel is connected to the end of the flotation aeration zone away from the foam discharge zone, and a flotation aeration pipe is laid at the bottom of the flotation aeration zone, and a plurality of microporous aeration disks are arranged on the flotation aeration pipe, and an air flotation aerator connected to the air flotation aeration pipe is arranged outside the oil separation tank, and an oil foam discharge device for discharging oil foam floating on the surface of sewage out of the foam discharge zone is transversely arranged at the upper end of the foam discharge zone;

[0008] A biochemical reaction tank is arranged on one side outside the oil separation tank, and the biochemical reaction tank is divided into an ammoniation reaction zone, a nitrification reaction zone and a denitrification reaction zone which are connected in sequence. The entrance of the ammoniation reaction zone is connected with the end of the foam discharge zone away from the flotation aeration zone through a diversion channel. An oxygenation aeration pipe is arranged at the bottom of the nitrification reaction zone, and a plurality of oxygenation aeration disks are arranged on the oxygenation aeration pipe. An oxygenation aerator connected with the oxygenation aeration pipe is arranged on the outside of the biochemical reaction tank.

[0009] A sludge separation tank is arranged outside the biochemical reaction tank on one side close to the denitrification reaction zone, a sewage transfer pump is arranged between the sludge separation tank and the denitrification reaction zone, the inlet end of the sewage transfer pump is connected with the outlet of the denitrification reaction zone through a second liquid pumping pipe, the outlet end of the sewage transfer pump is connected with the sludge separation tank through a second liquid discharge pipe, a negative pressure pipe is arranged horizontally in the sludge separation tank, the negative pressure pipe is connected with a plurality of horizontally arranged porous support pipes, each of the porous support pipes is covered with an ultrafiltration membrane sleeve, a negative pressure pump is arranged outside the sludge separation tank, and the inlet of the negative pressure pump The end is connected with the negative pressure pipe through the third liquid extraction pipe, the outlet end of the negative pressure pump is connected with the third liquid discharge pipe, a plurality of cleaning stirring motors are installed at the upper end of the sludge separation tank, the power output shaft of each cleaning stirring motor is connected with a hollow stirring pipe extending downward into the bottom of the ultrafiltration membrane sleeve, each hollow stirring pipe is provided with an aeration stirring pipe below and above the ultrafiltration membrane sleeve, and each aeration stirring pipe is provided with an aeration hole on the side facing the ultrafiltration membrane sleeve, a cleaning aeration pump is arranged outside the sludge separation tank, and the outlet end of the cleaning aeration pump is connected with an air supply pipe connected with the upper end of each hollow stirring pipe;

[0010] A sludge selection tank is arranged on one side outside the sludge separation tank, and the sludge selection tank is divided into a mixed feed area and a sludge selection area. A plurality of blocking inclined plates are arranged obliquely upward in the middle of the sludge selection area. The sludge selection tank forms a granular sludge precipitation area below the blocking inclined plates. The mixed feed area is connected to the granular sludge precipitation area. The height of the blocking inclined plates is set so that high-density granular sludge is not easy to pass through, and low-density sludge is easy to pass through with the water flow. A sludge selection pump is arranged outside the sludge selection tank, and the inlet end of the sludge selection pump is connected to the sludge separation tank through a fourth liquid extraction pipe. The sludge separation tank is connected, the outlet end of the sludge selection pump is connected to the mixed feed zone through the fourth drain pipe, a sludge circulation pump is arranged outside the sludge selection tank, the inlet end of the sludge circulation pump is connected to the granular sludge precipitation zone through the fifth liquid pumping pipe, the outlet end of the sludge circulation pump is connected to the inlet of the amination reaction zone through the fifth drain pipe, a sludge removal pump is arranged outside the sludge selection tank, the inlet end of the sludge removal pump is connected to the upper end of the sludge selection zone through the sixth liquid pumping pipe, and the outlet end of the sludge removal pump is connected to the sixth drain pipe.

[0011] By adopting the above technical solution, after the sewage is discharged into the filter tank, it first flows through the coarse grid filter device to intercept the larger coarse residue, and then flows through the fine grid filter device to intercept the smaller fine residue;

[0012] After passing through the filter tank, the sewage is lifted to the section inlet channel by a lifting pump, and flows into the vortex sedimentation tank through the section direction, where a rotating vortex water flow is formed. Under the action of the vortex centrifugal force, large particles of sand quickly settle to the bottom of the vortex sedimentation tank, and the sand at the bottom of the vortex sedimentation tank is discharged upward by the rotation of the spiral sedimentation conveying rod;

[0013] After passing through the vortex sedimentation tank, it flows into the oil separation tank. In the air flotation aeration area, microbubbles are aerated to produce tiny bubbles that absorb the oil in the sewage and float to the water surface, forming oil foam. The oil foam flows with the sewage into the foam discharge area and is intercepted and discharged by the oil foam discharge device.

[0014] After passing through the oil separation tank, the sewage flows into the biochemical reaction tank, and undergoes ammoniation in the ammoniation reaction zone. During this process, organic nitrogen compounds are decomposed into ammonia nitrogen by microorganisms. After ammoniation, nitrification is carried out in the nitrification reaction zone under the aeration conditions of the oxygenated aeration disk, converting ammonia nitrogen into nitrate. Finally, denitrification is carried out under anaerobic conditions in the denitrification reaction zone, reducing nitrate to nitrogen gas and releasing it into the atmosphere.

[0015] After passing through the biochemical reaction tank, it flows into the sludge separation tank. Through the suction action of the negative pressure pump, negative pressure is generated in the porous support tube, which accelerates the sewage to pass through the ultrafiltration membrane sleeve, leaving the sludge in the sludge separation tank, and the filtered sewage is discharged from the third drainage pipe. During the process, the cleaning stirring motor drives the aeration stirring tube to rotate and stir continuously, so that the sludge and sewage are fully mixed, and aeration increases the oxygen content of the sewage, accelerates the destruction of filamentous bacteria under non-dissolved oxygen conditions, and improves the elimination speed of filamentous bacteria. In addition, during the aeration and stirring process, the bubbles generated can remove the sludge on the surface of the ultrafiltration membrane sleeve to prevent clogging. After a certain period of use, the negative pressure pump can be started to rotate in the opposite direction to backwash the ultrafiltration membrane sleeve to prevent clogging.

[0016] When the SVI in the sludge separation tank is ≤130ml / g, the sludge circulation system is started, and the sludge selection pump works to pump the sewage sludge in the sludge separation tank into the mixed feed area of ​​the sludge selection tank, and then flows into the granular sludge sedimentation area along the mixed feed area, and then flows upward through the barrier inclined plate along the sludge selection area. When the high-density sludge moves upward along the gap between the barrier inclined plates, it can settle to the upper surface of the barrier inclined plate under the action of gravity, and then gradually sinks along the barrier inclined plate to the granular sludge sedimentation area. The higher the density of the sludge, the easier it is to settle, while the low-density sludge passes through the gap between the barrier inclined plates along the sewage, and is finally discharged by the sludge removal pump for dehydration treatment;

[0017] The sludge with high density, high strength, stable structure and easy separation in the granular sludge sedimentation area is pumped into the biochemical reaction tank through the sludge circulation pump for gradual recycling, forming a circulation system that can eliminate filamentous bacteria and solve the problem of sludge swelling.

[0018] The present invention is further configured as follows: the coarse grid filter device includes a rotating shaft that is laterally rotatably connected to the filter tank, a coarse filter drive motor for driving the rotating shaft to rotate is installed on one side of the filter tank, a plurality of coarse grid plates are arranged outside the rotating shaft, the bar holes on each coarse grid plate all pass through its free edge, an arc groove that cooperates with the rotation of the coarse grid plate is arranged at the bottom of the filter tank, a coarse slag output machine is laterally arranged on one side of the coarse grid filter device close to the fine grid filter device, and a scraper bar corresponding to the bar holes of the coarse grid plate is arranged on the side of the coarse grid filter device facing the coarse grid filter, and one end of the coarse slag output machine extends out of the filter tank.

[0019] The present invention is further configured such that the fine grid filter device includes a fine grid plate inclined in a direction away from the coarse grid filter device, and both inner walls of the filter tank are provided with inclined chains at the fine grid plate close to the coarse grid filter device, and the two inclined chains are cooperatively connected to a plurality of scrapers, and the free edge of each scraper is provided with scraping teeth that match the bar holes of the fine grid plate, and a fine slag output machine is transversely arranged on the side of the fine grid filter device away from the coarse grid filter device, one side of the fine slag output machine is close to the upper edge of the fine grid plate, and one end of the fine slag output machine extends out of the filter tank.

[0020] The present invention is further configured as follows: the oil foam discharge device includes an oil foam output groove horizontally arranged at the upper end of the foam discharge zone, the oil foam output groove is downwardly provided with an oil foam entry notch at a height through which only oil foam can enter, and a foam blocking strip is downwardly provided at the edge of the oil foam entry notch. One end of the oil foam output groove extends outwardly from the foam discharge zone, a spiral oil foam conveying rod is rotatably connected to the oil foam output groove, an oil foam discharge motor for driving the spiral oil foam conveying rod to rotate is installed at the free end of the oil foam output groove, and a foam discharge port is provided at one end of the oil foam output groove extending out of the foam discharge zone.

[0021] The present invention is further configured such that the biochemical reaction tank is provided with mixing and stirring motors above the ammoniation reaction zone and the denitrification reaction zone, and the power output shaft of each mixing and stirring motor is downwardly connected to a mixing and stirring device.

[0022] The present invention is further configured such that a plurality of hollow air hoods corresponding one-to-one to the cleaning and stirring motors are provided at the upper end of the sludge separation tank, each air hood is connected to the air pipe, each cleaning and stirring motor is installed at the upper end of the corresponding air hood, the power output shaft of each cleaning and stirring motor is connected to the upper end of the corresponding hollow stirring pipe in the corresponding air hood, and the upper end of each hollow stirring pipe is provided with an air inlet hole in the corresponding air hood.

[0023] The present invention is further configured such that the surface of each hollow stirring tube and each aeration stirring tube is chelated with iron ions.

[0024] The present invention is further configured such that a sludge discharge pump is provided outside the sludge selection tank, the inlet end of the sludge discharge pump is connected to the granular sludge precipitation area through a seventh liquid pumping pipe, and the outlet end of the sludge discharge pump is connected to a seventh liquid discharge pipe.

[0025] The present invention is further configured such that an ozone disinfection tank is provided on one side outside the sludge separation tank, the free end of the third drain pipe extends into the inlet of the ozone disinfection tank, the outlet direction of the ozone disinfection tank is connected with a drain pipe, an ozone aeration pipe is provided in the ozone disinfection tank, and the inlet end of the ozone aeration pipe is connected with an ozone generator.

[0026] The present invention is further configured to also include an SVI detection device for detecting the SVI value of sludge in the sludge separation tank.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] First, the present invention realizes the effective separation of sludge retention and hydraulic retention through the ultrafiltration membrane sleeve, and circulates the separated sludge to the biochemical reaction tank for continued use, so as to achieve the standard discharge of sewage and the effective recovery of organic carbon sources. The circulation in the biochemical reaction tank can form a circulation system that can eliminate filamentous bacteria, effectively deal with the problem of sludge swelling, and replace the secondary sedimentation tank, with the advantages of compact structure and small space occupation.

[0029] Secondly, in the sludge separation tank, the aeration function and the stirring function are integrated. The two functions are effectively applied to sewage treatment and filamentous bacteria elimination treatment respectively. On the one hand, the activated sludge and sewage can be fully mixed during sewage treatment, so that it has a good dissolved oxygen effect. On the other hand, the destruction of filamentous bacteria under non-dissolved oxygen conditions is accelerated, thereby increasing the elimination rate of filamentous bacteria.

[0030] Third, during the aeration and stirring process, the aeration and stirring tubes on both sides of the ultrafiltration membrane sleeve continuously spray air to both sides of the ultrafiltration membrane sleeve. The bubbles generated can remove the sludge on the surface of the ultrafiltration membrane sleeve to prevent clogging, making the ultrafiltration membrane sleeve less likely to be blocked during long-term use, which can greatly reduce the frequency of ultrafiltration membrane sleeve cleaning.

[0031] Fourthly, the sludge is separated by an inclined barrier plate in the sludge separation tank, and the granular sludge with high density, high strength, stable structure and easy separation is selected to flow back into the biochemical reaction tank. This can effectively increase the proportion of larger granular sludge in the biochemical reaction tank. Without adding a carrier, the concentration of activated sludge in the biochemical reaction tank can be effectively increased, thereby improving the sewage treatment efficiency and shock load resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 It is a schematic diagram of the overall structure of the filter pool;

[0034] Figure 3 It is a partial cross-sectional view for showing the spiral sedimentation conveying rod in the sediment output channel;

[0035] Figure 4 It is a schematic diagram of the overall structure of the oil separation tank;

[0036] Figure 5 It is a schematic diagram of the overall structure of the biochemical reaction pool;

[0037] Figure 6 It is a schematic diagram of the overall structure of the sludge separation tank;

[0038] Figure 7 Used to demonstrate the connection between the hollow stirring tube and the aeration stirring tube;

[0039] Figure 8 It is a schematic diagram of the overall structure of the ozone disinfection pool;

[0040] Fig. 9 It is a schematic diagram of the overall structure of the sludge selection tank;

[0041] Fig.10 It is a cross-sectional view of the sludge selection tank.

[0042] Among them, 1. filtration tank; 2. rotating shaft; 3. coarse filtration drive motor; 4. coarse grid plate; 5. coarse slag output machine; 6. scraper bar; 7. fine grid plate; 8. inclined chain; 9. scraper; 10. scraper teeth; 11. fine slag output machine; 12. vortex sedimentation tank; 13. lifting pump; 14. section inlet channel; 15. section outlet channel; 16. first suction pipe; 17. first discharge pipe; 18. sediment output channel; 19. spiral sedimentation conveying rod; 20. sediment discharge motor; 21. slag outlet; 22. oil Sewage separation tank; 23, air flotation aeration zone; 24, foam discharge zone; 25, air flotation aeration pipe; 26, microporous aeration plate; 27, air flotation aerator; 28, oil foam output slot; 29, oil foam entry gap; 30, foam blocking strip; 31, spiral oil foam delivery rod; 32, oil foam discharge motor; 33, foam discharge port; 34, biochemical reaction tank; 35, ammoniation reaction zone; 36, nitrification reaction zone; 37, denitrification reaction zone; 38, diversion channel; 39, oxygenation aeration pipe; 40, oxygenation aeration plate; 41, oxygenation aerator; 4 2. Mixing and stirring motor; 43. Mixing and stirring device; 44. Sludge separation tank; 45. Sewage transfer pump; 46. Second suction pipe; 47. Second discharge pipe; 48. Negative pressure pipe; 49. Ultrafiltration membrane sleeve; 50. Negative pressure pump; 51. Third suction pipe; 52. Third discharge pipe; 53. SVI detection device; 54. Air supply hood; 55. Cleaning and stirring motor; 56. Hollow stirring pipe; 57. Air inlet; 58. Aeration stirring pipe; 59. Aeration hole; 60. Cleaning aeration pump; 61. Air supply pipe; 62. Sewage Mud selection tank; 63. Mixing feed zone; 64. Sludge selection zone; 65. Blocking inclined plate; 66. Granular sludge sedimentation zone; 67. Sludge selection pump; 68. Fourth pumping pipe; 69. Fourth discharge pipe; 70. Sludge circulation pump; 71. Fifth pumping pipe; 72. Fifth discharge pipe; 73. Sludge removal pump; 74. Sixth pumping pipe; 75. Sixth discharge pipe; 76. Sludge discharge pump; 77. Seventh pumping pipe; 78. Seventh discharge pipe; 79. Ozone disinfection tank; 80. Drain pipe; 81. Ozone aeration pipe. DETAILED DESCRIPTION

[0043] The following is a further detailed description of an intelligent urban sewage treatment system proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will become clearer. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. The same or similar reference numerals in the accompanying drawings represent the same or similar components.

[0044] Example, see Figure 1-10, an intelligent urban sewage treatment system, comprising a filter tank 1, wherein a coarse grid filter device and a fine grid filter device are arranged in the filter tank 1. The coarse grid filter device comprises a rotating shaft 2 which is connected to the filter tank 1 in a transverse rotation, and a coarse filter driving motor 3 for driving the rotating shaft 2 to rotate is installed on one side of the filter tank 1, and five coarse grid plates 4 are arranged outside the rotating shaft 2, and the bar holes on each coarse grid plate 4 all pass through its free edge, and an arc groove (not shown) which is matched with the rotation of the coarse grid plate 4 is arranged at the bottom of the filter tank 1, and the coarse grid plate 4 intercepts large impurities in the sewage during the rotation process. A coarse slag output machine 5 is arranged transversely on one side of the coarse grid filter device close to the fine grid filter device, and a plurality of scraping strips 6 which correspond to the bar holes of the coarse grid plate 4 are arranged on the side of the coarse slag output machine 5 facing the coarse grid filter device, and are used to hang the impurities on the coarse grid plate 4 into the coarse slag output machine 5, and one end of the coarse slag output machine 5 extends out of the filter tank 1, and the intercepted large impurities are finally transported and discharged through the coarse slag output machine 5.

[0045] The fine grid filter device includes a fine grid plate 7 inclined in a direction away from the coarse grid filter device. The fine grid plate 7 intercepts the fine impurities passing through it. The two inner walls of the filter tank 1 are provided with an inclined chain 8 at the fine grid plate 7 near the coarse grid filter device. The two inclined chains 8 are connected to multiple scrapers 9. The free edge of each scraper 9 is provided with scraping teeth 10 that match the bar holes of the fine grid plate 7. The impurities in the bar holes of the fine grid plate 7 are scraped out by hanging teeth. A fine slag output machine 11 is horizontally arranged on the side of the fine grid filter device away from the coarse grid filter device. One side of the fine slag output machine 11 is close to the upper side of the fine grid plate 7. One end of the fine slag output machine 11 extends out of the filter tank 1. The intercepted fine impurities are finally transported and discharged through the fine slag output machine 11.

[0046] A vortex sedimentation tank 12 is arranged at the outlet direction of the filter tank 1, and a plurality of lifting pumps 13 are arranged between the filter tank 1 and the vortex sedimentation tank 12. One side of the upper end of the vortex sedimentation tank 12 is connected with a section inlet channel 14 arranged along the section direction thereof, and one side of the upper end of the vortex sedimentation tank 12 away from the section inlet channel 14 is arranged along the section direction thereof. A section outlet channel 15 is arranged, and the inlet end of each lifting pump 13 extends into the outlet of the filter tank 1 through a first liquid suction pipe 16, and the outlet end of each lifting pump 13 is connected with the section inlet channel 14 through a first liquid discharge pipe 17, and the sewage enters the vortex sedimentation tank through the section inlet channel 14. After the sedimentation tank 12, a rotating vortex water flow is formed in the vortex sedimentation tank 12. Under the action of the vortex centrifugal force, large particles of sand are quickly precipitated to the bottom of the vortex sedimentation tank 12. The bottom of the vortex sedimentation tank 12 is connected to a sediment output channel 18 arranged obliquely upward. A spiral sedimentation conveying rod 19 is rotatably connected in the sediment output channel 18. A sediment discharge motor 20 for driving the spiral sedimentation conveying rod 19 to rotate is installed at the free end of the sediment output channel (18). A slag discharge port 21 is opened at the upper end of the sediment output channel 18. Finally, the sand at the bottom of the vortex sedimentation tank 12 is discharged upward by the rotation of the spiral sedimentation conveying rod 19.

[0047] An oil separation tank 22 is arranged on one side outside the vortex sedimentation tank 12. The oil separation tank 22 is divided into a flotation aeration zone 23 and a foam discharge zone 24 which are connected in a U-shape. The free end of the cut surface outlet channel 15 is connected to the end of the flotation aeration zone 23 away from the foam discharge zone 24. Two flotation aeration pipes 25 are laid at the bottom of the flotation aeration zone 23. A plurality of microporous aeration disks 26 are arranged on the flotation aeration pipes 25. A plurality of flotation aerators 27 connected to the flotation aeration pipes 25 are arranged outside the oil separation tank 22. The microbubbles generated by aeration through the microporous aeration disks 26 absorb the oil in the sewage and float to the water surface. An oil foam discharge device for discharging oil foam floating on the sewage surface from the foam discharge zone 24 is transversely arranged at the upper end of the foam discharge zone 24. The oil foam discharge device includes an oil foam output groove 28 transversely arranged at the upper end of the foam discharge zone 24. The oil foam output groove 28 is downwardly provided with an oil foam entry notch 29 with a height of only one oil foam entering, which is arranged toward the side connected to the flotation aeration zone 23. A foam blocking strip 30 is downwardly arranged at the edge of the oil foam entry notch 29 for blocking the foam from flowing with the sewage. The oil foam eventually gradually enters the oil foam output groove 28 during the accumulation process. One end of the oil foam output groove 28 extends outward from the foam discharge zone 24. A spiral oil foam conveying rod 31 is rotatably connected in the oil foam output groove 28. An oil foam discharge motor 32 for driving the spiral oil foam conveying rod 31 to rotate is installed at the free end of the oil foam output groove 28. A foam discharge port 33 is opened at one end of the oil foam output groove 28 extending out of the foam discharge zone 24. Finally, the oil foam is discharged by the rotation of the spiral oil foam conveying rod 31.

[0048] A biochemical reaction tank 34 is provided on one side outside the oil separation tank 22. The biochemical reaction tank 34 is divided into an ammoniation reaction zone 35, a nitrification reaction zone 36 and a denitrification reaction zone 37 which are connected in sequence. Ammoniation is carried out in the ammoniation reaction zone 35. In this process, organic nitrogen compounds are decomposed into ammonia nitrogen (NH4 + ), after ammoniation, nitrification is carried out in the nitrification reaction zone 36 under aerobic conditions, which is the process of converting ammonia nitrogen into nitrate, and finally denitrification is carried out in the denitrification reaction zone 37 under anaerobic conditions, and nitrate is reduced to nitrogen (N2) and released into the atmosphere. The entrance of the ammoniation reaction zone 35 is connected to the end of the foam discharge zone 24 away from the flotation aeration zone 23 through a diversion channel 38, and a plurality of oxygenation aeration pipes 39 are arranged at the bottom of the nitrification reaction zone 36, and a plurality of oxygenation aeration plates 40 are arranged on the oxygenation aeration pipes 39, and a plurality of oxygenation aeration machines 41 connected to the oxygenation aeration pipes 39 are arranged outside the biochemical reaction tank 34. The biochemical reaction tank 34 is equipped with a plurality of mixing and stirring motors 42 above the ammoniation reaction zone 35 and the denitrification reaction zone 37, and the power output shaft of each mixing and stirring motor 42 is connected to a mixing agitator 43 downward to promote the mixing of sludge and sewage so that they can react fully.

[0049] A sludge separation tank 44 is arranged outside the biochemical reaction tank 34 and near the denitrification reaction zone 37. A sewage transfer pump 45 is arranged between the sludge separation tank 44 and the denitrification reaction zone 37. The inlet end of the sewage transfer pump 45 is connected to the outlet of the denitrification reaction zone 37 through a second liquid extraction pipe 46. The outlet end of the sewage transfer pump 45 is connected to the sludge separation tank 44 through a second liquid discharge pipe 47. A negative pressure pipe 48 is arranged horizontally in the sludge separation tank 44. The negative pressure pipe 48 There are multiple horizontally arranged porous support pipes (not shown), each of which is covered with an ultrafiltration membrane sleeve 49. A negative pressure pump 50 is arranged outside the sludge separation tank 44. The inlet end of the negative pressure pump 50 is connected to the negative pressure pipe 48 through a third liquid extraction pipe 51. Through the suction action of the negative pressure pump 50, negative pressure is generated in the porous support pipe, which accelerates the sewage to pass through the ultrafiltration membrane sleeve 49 and leaves the sludge in the sludge separation tank 44. The outlet end of the negative pressure pump 50 is connected to a third liquid discharge pipe 52. It also includes an SVI detection device 53 for detecting the SVI value of the sludge in the sludge separation tank 44. The SVI detection device 53 adopts the Korean / BLTEC online activated sludge total index (SVI) system for intelligently detecting the SVI value in the sludge separation tank 44.

[0050] Two hollow air hoods 54 are provided at the upper end of the sludge separation tank 44, and a cleaning stirring motor 55 is installed at the upper end of each air hood 54. The power output shaft of each cleaning stirring motor 55 is connected to a hollow stirring tube 56 extending downward into the lower part of the ultrafiltration membrane sleeve 49. The power output shaft of each cleaning stirring motor 55 is connected to the upper end of the corresponding hollow stirring tube 56 in the corresponding air hood 54. The upper end of each hollow stirring tube 56 is provided with three air inlet holes 57 in the corresponding air hood 54. Each hollow stirring tube 56 is provided with a horizontally arranged aeration stirring tube below and above the ultrafiltration membrane sleeve 49. 58. Two aeration and stirring tubes 58 are arranged in a cross shape. The surfaces of each hollow stirring tube 56 and each aeration and stirring tube 58 are chelated with iron ions to promote the elimination of filamentous bacteria. A plurality of aeration holes 59 are provided on the side of each aeration and stirring tube 58 facing the ultrafiltration membrane sleeve 49. A clean aeration pump 60 is arranged outside the sludge separation tank 44. The outlet end of the clean aeration pump 60 is connected to an air pipe 61 connected to the upper end of each hollow stirring tube 56. Each air supply hood 54 is connected to the air pipe 61. The aeration and stirring tubes 58 on the upper and lower sides of the ultrafiltration membrane sleeve 49 are aerated and cleaned when they rotate to prevent sludge adhesion.

[0051] A sludge selection tank 62 is arranged on one side outside the sludge separation tank 44. The sludge selection tank 62 is divided into a mixed feed area 63 and a sludge selection area 64. A plurality of blocking inclined plates 65 are arranged obliquely upward in the middle of the sludge selection area 64. The sludge selection tank 62 forms a granular sludge sedimentation area 66 below the blocking inclined plates 65. The mixed feed area 63 is connected with the granular sludge sedimentation area 66. When the sludge moves upward along the gap between the blocking inclined plates 65, it can settle to the upper surface of the blocking inclined plates 65 under the action of gravity, and then gradually sinks into the granular sludge sedimentation area 66 along the blocking inclined plates 65. The denser the sludge, the easier it is to settle. The height setting of the blocking inclined plates 65 makes it difficult for high-density granular sludge to pass through, and small-density sludge can easily pass through with the water flow. A sludge selection pump 67 is arranged outside the sludge selection tank 62, and the inlet end of the sludge selection pump 67 is connected to the sludge separation tank 44 through a fourth liquid pumping pipe 68, and the outlet end of the sludge selection pump 67 is connected to the mixed feed area 63 through a fourth liquid discharge pipe 69. A sludge circulation pump 70 is arranged outside the sludge selection tank 62, and the inlet end of the sludge circulation pump 70 is connected to the granular sludge precipitation area 66 through a fifth liquid pumping pipe 71, and the outlet end of the sludge circulation pump 70 is connected to the inlet of the ammoniation reaction zone 35 through a fifth liquid discharge pipe 72, so that the active granular sludge is circulated into the biochemical reaction tank 34.

[0052] A sludge removal pump 73 is provided outside the sludge selection tank 62. The inlet end of the sludge removal pump 73 is connected to the upper end of the sludge selection area 64 through a sixth liquid extraction pipe 74. The outlet end of the sludge removal pump 73 is connected to a sixth liquid discharge pipe 75. The sludge with low density passes through the gap of the blocking inclined plate 65 with the sewage and is discharged through the sludge removal pump 73 for dehydration treatment. A sludge discharge pump 76 is provided outside the sludge selection tank 62. The inlet end of the sludge discharge pump 76 is connected to the granular sludge precipitation area 66 through a seventh liquid extraction pipe 77. The outlet end of the sludge discharge pump 76 is connected to a seventh liquid discharge pipe 78 to discharge excess granular sludge for dehydration treatment.

[0053] An ozone disinfection tank 79 is provided on one side outside the sludge separation tank 44. The free end of the third drain pipe 52 extends into the inlet of the ozone disinfection tank 79. A drain pipe 80 is connected to the outlet direction of the ozone disinfection tank 79 to discharge the qualified water after the final purification treatment. A plurality of ozone aeration pipes 81 are provided in the ozone disinfection tank 79. The inlet end of the ozone aeration pipe 81 is connected to the ozone generator (not shown).

[0054] Working principle: After the sewage is discharged into the filter tank 1, it first flows through the coarse screen filter device to intercept the larger coarse residue and discharge it to the outside through the coarse residue output machine 5, and then flows through the fine screen filter device to intercept the smaller fine residue and discharge it to the outside through the fine residue output machine 11;

[0055] After passing through the filter tank 1, the sewage is lifted to the section inlet channel 14 by the lifting pump 13, and flows into the vortex sedimentation tank 12 along the section direction, and a rotating vortex water flow is formed in the vortex sedimentation tank 12. Under the action of the vortex centrifugal force, large particles of sand are quickly precipitated to the bottom of the vortex sedimentation tank 12, and the sand at the bottom of the vortex sedimentation tank 12 is discharged upward by the rotation of the spiral sedimentation conveying rod 19;

[0056] After passing through the eddy current sedimentation tank 12, it flows into the oil separation tank 22, and is aerated by microbubbles in the air flotation aeration zone 23. The generated microbubbles absorb the oil in the sewage and float on the water surface to form oil foam. The oil foam flows with the sewage into the foam discharge zone 24, is blocked by the foam blocking strip 30 of the oil foam output groove 28, and gradually accumulates and flows into the oil foam output groove 28. The oil foam is discharged by the rotation of the spiral oil foam delivery rod 31.

[0057] After passing through the oil separation tank 22, the sewage flows into the biochemical reaction tank 34, and undergoes ammoniation in the ammoniation reaction zone 35. During this process, the organic nitrogen compounds are decomposed into ammonia nitrogen by microorganisms. After ammoniation, the sewage undergoes nitrification in the nitrification reaction zone 36 under the aeration conditions of the oxygenated aeration plate 40, and the ammonia nitrogen is converted into nitrate. Finally, the sewage undergoes denitrification under anaerobic conditions in the denitrification reaction zone 37, and the nitrate is reduced to nitrogen gas and released into the atmosphere.

[0058] After passing through the biochemical reaction tank 34, it flows into the sludge separation tank 44. Through the suction action of the negative pressure pump 50, negative pressure is generated in the porous support tube, which accelerates the sewage to pass through the ultrafiltration membrane sleeve 49, leaving the sludge in the sludge separation tank 44, and the filtered sewage is discharged from the third drainage pipe 52. During the process, the cleaning stirring motor 55 drives the aeration stirring tube 58 to rotate and stir continuously, so that the sludge and sewage are fully mixed, and aeration increases the oxygen content of the sewage, accelerates the destruction of filamentous bacteria under non-dissolved oxygen conditions, and improves the elimination speed of filamentous bacteria. In addition, during the aeration and stirring process, the bubbles generated can remove the sludge on the surface of the ultrafiltration membrane sleeve 49 to prevent clogging. After a certain period of use, the negative pressure pump 50 can be started to rotate in the reverse direction to backwash the ultrafiltration membrane sleeve 49 to prevent clogging.

[0059] After passing through the sludge separation tank 44, the sewage flows into the ozone disinfection tank 79 through the third drain pipe 52, and is disinfected by ozone aeration, and the purified water that meets the standards is discharged;

[0060] The SVI value in the sludge separation tank 44 is detected in real time by the SVI detection device 53. When SVI≤130ml / g, the sludge circulation system is started, and the sludge selection pump 67 works to pump the sewage sludge in the sludge separation tank 44 into the mixed feed area 63 of the sludge selection tank 62, and flows into the granular sludge precipitation area 66 along the mixed feed area 63, and then flows upward through the blocking inclined plate 65 along the sludge selection area 64. When the high-density sludge moves upward along the gap between the blocking inclined plates 65, it can be precipitated to the upper surface of the blocking inclined plates 65 under the action of gravity, and then gradually sinks into the granular sludge precipitation area 66 along the blocking inclined plates 65. The sludge with a larger density is easier to precipitate, while the sludge with a smaller density passes through the gap between the blocking inclined plates 65 along the sewage, and is finally discharged through the sludge removal pump 73 for dehydration treatment;

[0061] The sludge with high density, high strength, stable structure and easy separation in the granular sludge sedimentation area 66 is pumped into the biochemical reaction tank 34 through the sludge circulation pump 70 for gradual recycling, forming a circulation system that can eliminate filamentous bacteria and solve the problem of sludge swelling. The excess sludge in the granular sludge sedimentation area 66 is discharged through the sludge discharge pump 76 for dehydration treatment.

[0062] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0063] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. An intelligent urban sewage treatment system, comprising a filter tank (1), wherein a coarse grid filter device and a fine grid filter device are arranged in the filter tank (1), a vortex sedimentation tank (12) is arranged in the outlet direction of the filter tank (1), and a lifting pump (13) is arranged between the filter tank (1) and the vortex sedimentation tank (12), characterized in that: One side of the upper end of the vortex sedimentation tank (12) is connected to a section inlet channel (14) arranged along the section direction thereof; one side of the upper end of the vortex sedimentation tank (12) away from the section inlet channel (14) is provided with a section outlet channel (15) along the section direction thereof; the inlet end of the lifting pump (13) extends into the outlet of the filtering tank (1) through a first liquid extraction pipe (16); the outlet end of the lifting pump (13) is connected to the section inlet channel (14) through a first liquid discharge pipe (17); the bottom of the vortex sedimentation tank (12) is connected to a sediment output channel (18) arranged obliquely upward; a spiral sedimentation conveying rod (19) is rotatably connected in the sediment output channel (18); a sediment discharge motor (20) for driving the spiral sedimentation conveying rod (19) to rotate is installed at the free end of the sediment output channel (18); a sediment discharge port (21) is provided at the upper end of the sediment output channel (18); An oil separation tank (22) is arranged on one side outside the vortex sedimentation tank (12), and the oil separation tank (22) is divided into a flotation aeration zone (23) and a foam discharge zone (24) which are connected in a U-shape. The free end of the section outlet channel (15) is connected to an end of the flotation aeration zone (23) away from the foam discharge zone (24). A flotation aeration pipe (25) is laid at the bottom of the flotation aeration zone (23), and a plurality of microporous aeration disks (26) are arranged on the flotation aeration pipe (25). An air flotation aerator (27) connected to the air flotation aeration pipe (25) is arranged outside the oil separation tank (22), and an oil foam discharge device for discharging oil foam floating on the surface of sewage out of the foam discharge zone (24) is transversely arranged at the upper end of the foam discharge zone (24); A biochemical reaction pool (34) is arranged on one side outside the oil separation pool (22), and the biochemical reaction pool (34) is divided into an ammoniation reaction zone (35), a nitrification reaction zone (36) and a denitrification reaction zone (37) which are connected in sequence. The entrance of the ammoniation reaction zone (35) is connected to the end of the foam discharge zone (24) away from the flotation aeration zone (23) through a guide channel (38). An oxygenation aeration pipe (39) is arranged at the bottom of the nitrification reaction zone (36), and a plurality of oxygenation aeration disks (40) are arranged on the oxygenation aeration pipe (39). An oxygenation aerator (41) connected to the oxygenation aeration pipe (39) is arranged on the outside of the biochemical reaction pool (34); A sludge separation tank (44) is arranged outside the biochemical reaction tank (34) on one side close to the denitrification reaction zone (37). A sewage transfer pump (45) is arranged between the sludge separation tank (44) and the denitrification reaction zone (37). The inlet end of the sewage transfer pump (45) is connected to the outlet of the denitrification reaction zone (37) through a second liquid extraction pipe (46). The outlet end of the sewage transfer pump (45) is connected to the sludge separation tank (44) through a second liquid discharge pipe (47). A negative pressure pipe (48) is arranged transversely in the sludge separation tank (44). The negative pressure pipe (48) is connected to a plurality of horizontally arranged multi-porous support pipes, each of which is covered with an ultrafiltration membrane sleeve (49). A negative pressure pump (50) is arranged outside the sludge separation tank (44). The inlet end of the negative pressure pump (50) is connected to the outlet end of the denitrification reaction zone (37). The negative pressure pump (50) is connected to the negative pressure pipe (48) through a third liquid extraction pipe (51), and the outlet end of the negative pressure pump (50) is connected to a third liquid discharge pipe (52). A plurality of cleaning and stirring motors (55) are installed at the upper end of the sludge separation tank (44). The power output shaft of each cleaning and stirring motor (55) is connected to a hollow stirring pipe (56) extending downwardly into the lower part of the ultrafiltration membrane sleeve (49). Each hollow stirring pipe (56) is provided with an aeration stirring pipe (58) below and above the ultrafiltration membrane sleeve (49). Each aeration stirring pipe (58) is provided with an aeration hole (59) on one side facing the ultrafiltration membrane sleeve (49). A cleaning aeration pump (60) is arranged outside the sludge separation tank (44), and the outlet end of the cleaning aeration pump (60) is connected to an air supply pipe (61) connected to the upper end of each hollow stirring pipe (56); A sludge selection tank (62) is arranged on one side outside the sludge separation tank (44), and the sludge selection tank (62) is divided into a mixed feed zone (63) and a sludge selection zone (64). A plurality of blocking inclined plates (65) are arranged obliquely upward in the middle of the sludge selection zone (64). The sludge selection tank (62) forms a granular sludge precipitation zone (66) below the blocking inclined plates (65). The mixed feed zone (63) is connected to the granular sludge precipitation zone (66). The height of the blocking inclined plates (65) is set so that high-density granular sludge is not easy to pass through, while low-density sludge can easily pass through with the water flow. A sludge selection pump (67) is arranged outside the sludge selection tank (62), and the inlet end of the sludge selection pump (67) is connected to the sludge separation tank (62) through a fourth liquid extraction pipe (68). The sludge selection tank (44) is connected to the granular sludge precipitation zone (66) through a fifth liquid extraction pipe (71), and the outlet end of the sludge circulation pump (70) is connected to the granular sludge precipitation zone (66) through a fifth liquid extraction pipe (71). The outlet end of the sludge circulation pump (70) is connected to the inlet of the amination reaction zone (35) through a fifth liquid extraction pipe (72). A sludge removal pump (73) is provided outside the sludge selection tank (62), and the inlet end of the sludge removal pump (73) is connected to the upper end of the sludge selection zone (64) through a sixth liquid extraction pipe (74). The outlet end of the sludge removal pump (73) is connected to the sixth liquid extraction pipe (75).

2. An intelligent urban sewage treatment system according to claim 1, characterized in that: The coarse grid filter device comprises a rotating shaft (2) which is connected to the filter tank (1) for transverse rotation. A coarse filtering drive motor (3) for driving the rotating shaft (2) to rotate is installed on one side of the filter tank (1). A plurality of coarse grid plates (4) are arranged outside the rotating shaft (2). The bar holes on each coarse grid plate (4) extend out of its free edge. An arc groove which cooperates with the rotation of the coarse grid plate (4) is arranged at the bottom of the filter tank (1). A coarse slag output machine (5) is arranged transversely on one side of the coarse grid filter device close to the fine grid filter device. A scraper (6) which corresponds to the bar holes of the coarse grid plate (4) is arranged on the side of the coarse grid filter device facing the coarse grid filter device. One end of the coarse slag output machine (5) extends out of the filter tank (1).

3. The intelligent urban sewage treatment system according to claim 1 is characterized in that: The fine grid filter device comprises a fine grid plate (7) inclined in a direction away from the coarse grid filter device, and both inner walls of the filter tank (1) are provided with inclined chains (8) at the locations where the fine grid plate (7) is close to the coarse grid filter device. The two inclined chains (8) are connected to a plurality of scrapers (9), and the free edge of each scraper (9) is provided with scraping teeth (10) that match the bar holes of the fine grid plate (7). A fine slag output machine (11) is transversely provided on the side of the fine grid filter device away from the coarse grid filter device, and one side of the fine slag output machine (11) is close to the upper side of the fine grid plate (7), and one end of the fine slag output machine (11) extends out of the filter tank (1).

4. The intelligent urban sewage treatment system according to claim 1 is characterized in that: The oil foam discharge device comprises an oil foam output groove (28) arranged transversely at the upper end of the foam discharge zone (24); an oil foam inlet notch (29) with a height that only allows oil foam to enter is opened downwardly on the side of the oil foam output groove (28) that is connected to the flotation aeration zone (23); a foam blocking strip (30) is arranged downwardly on the edge of the oil foam inlet notch (29); one end of the oil foam output groove (28) extends outwardly from the foam discharge zone (24); a spiral oil foam conveying rod (31) is rotatably connected in the oil foam output groove (28); an oil foam discharge motor (32) for driving the spiral oil foam conveying rod (31) to rotate is installed at the free end of the oil foam output groove (28); and a foam discharge port (33) is opened at one end of the oil foam output groove (28) that extends out of the foam discharge zone (24).

5. The intelligent urban sewage treatment system according to claim 1 is characterized in that: The biochemical reaction pool (34) is equipped with mixing and stirring motors (42) above the ammoniation reaction zone (35) and the denitrification reaction zone (37), and the power output shaft of each mixing and stirring motor (42) is connected downwardly to a mixing and stirring device (43).

6. The intelligent urban sewage treatment system according to claim 1 is characterized in that: The upper end of the sludge separation tank (44) is provided with a plurality of hollow air supply hoods (54) corresponding one to one with the cleaning and stirring motors (55), each of the air supply hoods (54) is connected to the air supply pipe (61), each of the cleaning and stirring motors (55) is installed at the upper end of the corresponding air supply hood (54), the power output shaft of each cleaning and stirring motor (55) is connected to the upper end of the corresponding hollow stirring pipe (56) in the corresponding air supply hood (54), and the upper end of each hollow stirring pipe (56) is provided with an air inlet hole (57) in the corresponding air supply hood (54).

7. The intelligent urban sewage treatment system according to claim 1 is characterized in that: The surface of each hollow stirring tube (56) and each aeration stirring tube (58) is chelated with iron ions.

8. The intelligent urban sewage treatment system according to claim 1 is characterized in that: A sludge discharge pump (76) is arranged outside the sludge selection tank (62), and the inlet end of the sludge discharge pump (76) is connected to the granular sludge sedimentation area (66) through a seventh liquid pumping pipe (77), and the outlet end of the sludge discharge pump (76) is connected to a seventh liquid discharge pipe (78).

9. An intelligent urban sewage treatment system according to any one of claims 1 to 8, characterized in that: An ozone disinfection tank (79) is provided on one side outside the sludge separation tank (44), the free end of the third drain pipe (52) extends into the inlet of the ozone disinfection tank (79), the outlet direction of the ozone disinfection tank (79) is connected to a drain pipe (80), an ozone aeration pipe (81) is provided in the ozone disinfection tank (79), and the inlet end of the ozone aeration pipe (81) is connected to an ozone generator.

10. An intelligent urban sewage treatment system according to claim 9, characterized in that: It also includes an SVI detection device (53) for detecting the SVI value of the sludge in the sludge separation tank (44).

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