Intelligent urban sewage treatment system

Abstract

The application provides a kind of intelligent urban sewage treatment system, including filter tank, coarse grid filter device and fine grid filter device are arranged in filter tank, vortex sedimentation tank is arranged in the outlet direction of filter tank, oil and dirt separation tank is arranged in the one side of vortex sedimentation tank, oil and dirt separation tank is horizontally provided with oil scum discharge device at upper end, biochemical reaction tank is arranged in the one side of oil and dirt separation tank, biochemical reaction tank is divided into ammonia reaction zone, nitrification reaction zone and denitrification reaction zone which are communicated in sequence, sludge separation tank is arranged in the one side of biochemical reaction tank close to denitrification reaction zone, negative pressure pipe is horizontally provided in sludge separation tank, negative pressure pipe is communicated with multiple porous support pipes arranged horizontally, each porous support pipe is sleeved with ultrafiltration membrane sleeve, sludge selection tank is arranged in the one side of sludge separation tank. The sewage treatment system of the application can effectively separate sludge and water, effectively improve the elimination speed of filamentous bacteria, and effectively solve the problem of sludge expansion.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of urban sewage treatment, and relates to an intelligent urban sewage treatment system. BACKGROUND

[0002] Urban sewage treatment is an important part of modern urban infrastructure, aiming to remove pollutants in 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 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 activated sludge method, which has been widely used worldwide due to its high efficiency in removing organic matter.

[0003] The basic principle of activated sludge method is to biodegrade organic pollutants in sewage by microbial populations (activated sludge). These microbial communities usually include bacteria, fungi and other protozoa, which grow and decompose organic matter in water under aerobic conditions. The core components of activated sludge system include primary sedimentation tank, aeration tank and secondary sedimentation tank. Sewage first enters the primary sedimentation tank to remove larger particles, then enters the aeration tank, where air is supplied to the water through aeration equipment to ensure sufficient dissolved oxygen (DO) supply to promote microbial metabolism. Finally, the treated mixed liquid enters the secondary sedimentation tank, and the activated sludge is settled down by gravity to separate from the treated clear 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 water quality lacks iron. When this happens, the original beneficial bacteria may transform into microfilamentous bacteria. Microfilamentous bacteria are a kind of bacteria with special morphology, and their excessive proliferation in activated sludge will cause the sludge structure to become loose, lose its original flocculation ability, and further cause the so-called "sludge bulking" problem. Once the activated sludge bulks, its settling performance will decrease significantly, causing difficulty in separating sludge and water, and even completely separating them. This not only causes a large amount of activated sludge to be lost, affecting the normal operation of the treatment system, but also causes the treated water quality to deteriorate, failing to meet the discharge standards. SUMMARY

[0005] The present application aims to provide an intelligent urban sewage treatment system that can effectively separate sludge and water, effectively improve the elimination speed of filamentous bacteria, and effectively solve the problem of sludge bulking.

[0006] To solve the above technical problems, the application provides an intelligent urban sewage treatment system, which comprises 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 at 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 communicated with a tangent plane inlet channel arranged along the tangent plane direction, the side of the upper end of the vortex sedimentation tank away from the tangent plane inlet channel is provided with a tangent plane outlet channel along the tangent plane direction, the inlet end of the lifting pump is extended into the outlet of the filter tank through a first liquid pumping pipe, the outlet end of the lifting pump is communicated with the tangent plane inlet channel through a first liquid discharging pipe, the bottom of the vortex sedimentation tank is communicated with a sludge output channel arranged obliquely upward, a spiral sedimentation conveying rod is rotatably connected in the sludge output channel, a sludge discharging motor for driving the spiral sedimentation conveying rod to rotate is arranged at the free end of the sludge output channel, and a sludge discharge port is arranged at the upper end of the sludge output channel.

[0007] An oil and dirt separation tank is arranged at one side of the vortex sedimentation tank, the oil and dirt separation tank is divided into a flotation aeration zone and a froth discharge zone which are communicated in a U shape, the free end of the tangent plane outlet channel is communicated with one end of the flotation aeration zone away from the froth discharge zone, the bottom of the flotation aeration zone is paved with a flotation aeration pipe, a plurality of microporous aeration discs are arranged on the flotation aeration pipe, a flotation aerator which is communicated with the flotation aeration pipe is arranged outside the oil and dirt separation tank, and an oil froth discharging device for discharging the oil froth floating on the surface of the sewage from the froth discharge zone is arranged at the upper end of the froth discharge zone.

[0008] A biochemical reaction tank is arranged at one side of the oil and dirt separation tank, the biochemical reaction tank is divided into an ammonification reaction zone, a nitrification reaction zone and a denitrification reaction zone which are communicated in sequence, the inlet of the ammonification reaction zone is communicated with one end of the froth discharge zone away from the flotation aeration zone through a flow guide channel, the bottom of the nitrification reaction zone is provided with an oxygenation aeration pipe, a plurality of oxygenation aeration discs are arranged on the oxygenation aeration pipe, and an oxygenation aerator which is communicated with the oxygenation aeration pipe is arranged outside the biochemical reaction tank.

[0009] A sludge separation tank is arranged outside the biochemical reaction tank and close to one side of the denitrification reaction zone, a sewage transfer pump is arranged between the denitrification reaction zones, an inlet end of the sewage transfer pump is communicated with an outlet of the denitrification reaction zone through a second liquid pumping pipe, an outlet end of the sewage transfer pump is communicated with the sludge separation tank through a second liquid discharging pipe, a negative pressure pipe is transversely arranged in the sludge separation tank, the negative pressure pipe is communicated with a plurality of horizontally arranged porous support pipes, each porous support pipe is sleeved with an ultrafiltration membrane sleeve, a negative pressure pump is arranged outside the sludge separation tank, an inlet end of the negative pressure pump is communicated with the negative pressure pipe through a third liquid pumping pipe, an outlet end of the negative pressure pump is communicated with a third liquid discharging pipe, a plurality of cleaning stirring motors are installed at an upper end of the sludge separation tank, a power output shaft of each cleaning stirring motor is connected with a hollow stirring pipe which extends downward below the ultrafiltration membrane sleeve, an aeration stirring pipe is arranged below and above each hollow stirring pipe, an aeration hole is formed in a side of each aeration stirring pipe which faces the ultrafiltration membrane sleeve, a cleaning aeration pump is arranged outside the sludge separation tank, an outlet end of the cleaning aeration pump is communicated with a gas conveying pipe which is communicated with an upper end of each hollow stirring pipe;

[0010] A sludge selection tank is arranged outside one side of the sludge separation tank, the sludge selection tank is divided into a mixed feed zone and a sludge selection zone, a plurality of blocking inclined plates are obliquely arranged at a middle part of the sludge selection zone, a granular sludge sedimentation zone is formed below the blocking inclined plates in the sludge selection tank, the mixed feed zone is communicated with the granular sludge sedimentation zone, the height of the blocking inclined plates is arranged so that the large-density granular sludge is not easy to pass through, and the small-density sludge is easy to pass through with water flow, a sludge selection pump is arranged outside the sludge selection tank, an inlet end of the sludge selection pump is communicated with the sludge separation tank through a fourth liquid pumping pipe, an outlet end of the sludge selection pump is communicated with the mixed feed zone through a fourth liquid discharging pipe, a sludge circulation pump is arranged outside the sludge selection tank, an inlet end of the sludge circulation pump is communicated with the granular sludge sedimentation zone through a fifth liquid pumping pipe, an outlet end of the sludge circulation pump is communicated with an inlet of the ammonification reaction zone through a fifth liquid discharging pipe, a sludge removal pump is arranged outside the sludge selection tank, an inlet end of the sludge removal pump is communicated with an upper end of the sludge selection zone through a sixth liquid pumping pipe, and an outlet end of the sludge removal pump is communicated with a sixth liquid discharging pipe.

[0011] By adopting the above technical scheme, after the sewage is discharged into the filter tank, it first flows through the coarse grid filtering device to intercept large coarse residues, and then flows through the fine grid filtering device to intercept small fine residues.

[0012] After the filter tank, sewage is lifted to the cut surface inlet channel by the lifting pump, and flows into the vortex sedimentation tank in the cut direction, forming a rotating vortex flow in the vortex sedimentation tank. Under the action of vortex centrifugal force, large particles of sand quickly settle to the bottom of the vortex sedimentation tank, and are discharged upward by the spiral sedimentation conveying rod rotating at the bottom of the vortex sedimentation tank;

[0013] After the vortex sedimentation tank, the sewage flows into the oil separation tank. In the air flotation aeration zone, micro-bubble aeration is carried out, and the generated micro-bubbles adsorb the oil in the sewage and float to the water surface to form oil foam. The oil foam is discharged with the sewage to the discharge area and is intercepted and discharged by the oil foam discharge device.

[0014] After the oil separation tank, the sewage flows into the biochemical reaction tank. In the ammoniation reaction zone, organic nitrogen compounds are decomposed into ammonia nitrogen by microorganisms. After ammoniation, in the nitrification reaction zone, under the aeration condition of the oxygen increasing aeration disc, nitrification is carried out to convert ammonia nitrogen into nitrate. Finally, in the denitrification reaction zone, under anaerobic conditions, denitrification is carried out to reduce nitrate to nitrogen and release it into the atmosphere.

[0015] After the biochemical reaction tank, the sewage flows into the sludge separation tank. The negative pressure pump generates negative pressure in the porous support pipe to accelerate the sewage to pass through the ultrafiltration membrane sleeve, leaving the sludge in the sludge separation tank. The filtered sewage is discharged from the third liquid discharge pipe. In the process, the clean stirring motor drives the aeration stirring pipe to rotate continuously to mix the sludge and the sewage thoroughly, increase the oxygen content of the sewage, and accelerate the destruction of filamentous bacteria under non-dissolved oxygen conditions to improve the elimination speed of filamentous bacteria. In the process of aeration and stirring, the generated bubbles 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 is started in reverse rotation to backwash the ultrafiltration membrane sleeve to prevent clogging.

[0016] When the SVI in the sludge separation tank is less than or equal to 130 ml / g, the sludge circulation system is started, and the sludge selection pump works to pump the sewage and sludge in the sludge separation tank into the mixing feed area of the sludge selection tank. The sewage and sludge flow into the granular sludge sedimentation area along the mixing feed area, and then flow upward through the blocking inclined plate along the sludge selection area. The sludge with large density moves upward along the gap between the blocking inclined plates, and under the action of gravity, it can be deposited on the upper surface of the blocking inclined plate. The sludge with large density gradually sinks along the blocking inclined plate into the granular sludge sedimentation area. The sludge with small density passes through the gap between the blocking inclined plates along with the sewage, and is finally discharged by the sludge removal pump for dewatering treatment.

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

[0018] The application further provides that the coarse grid filtering device comprises a rotating shaft transversely connected to the filter tank, one side of the filter tank is provided with a coarse filtering driving motor for driving the rotating shaft to rotate, the rotating shaft is provided with a plurality of coarse grid plates, the slits on each coarse grid plate are arranged to pass through the free edge thereof, the bottom of the filter tank is provided with an arc-shaped groove matched with the rotation of the coarse grid plate, and a coarse residue output machine is transversely arranged at one side of the coarse grid filtering device close to the fine grid filtering device.

[0019] The application further provides that the fine grid filtering device comprises a fine grid plate inclined away from the coarse grid filtering device, and two inner walls of the filter tank are provided with inclined chains at positions close to the coarse grid filtering device, and the two inclined chains are connected with a plurality of scrapers, the free edge of each scraper is provided with a scraper tooth matched with the slits of the fine grid plate, and a fine residue output machine is transversely arranged at one side of the fine grid filtering device away from the coarse grid filtering device, one side of the fine residue output machine is close to the upper edge of the fine grid plate, and one end of the fine residue output machine extends out of the filter tank.

[0020] The application further provides that the oil foam discharge device comprises an oil foam output slot transversely arranged at the upper end of the oil foam discharge area, the oil foam output slot is downwardly provided with an oil foam entering gap with a height only allowing oil foam to enter at one side of the oil foam output slot communicated with the air floatation and aeration area, the edge of the oil foam entering gap is downwardly provided with a foam blocking strip, one end of the oil foam output slot extends out of the oil foam discharge area, a spiral oil foam conveying rod is rotatably connected in the oil foam output slot, an oil foam discharge motor is arranged at the free end of the oil foam output slot for driving the spiral oil foam conveying rod to rotate, and the oil foam output slot is provided with a discharge port at one end extending out of the oil foam discharge area.

[0021] The application further provides that the biochemical reaction tank is provided with a mixing and stirring motor above the ammoniation reaction area and the denitrification reaction area, and a mixing and stirring device is connected to the power output shaft of each mixing and stirring motor.

[0022] The application further provides that the upper end of the sludge separation tank is provided with a plurality of hollow air conveying covers corresponding to the cleaning stirring motors, each air conveying cover is communicated with the air conveying pipe, each cleaning stirring motor is arranged at the upper end of the corresponding air conveying cover, the power output shaft of each cleaning stirring motor is connected with the upper end of the corresponding hollow stirring pipe in the corresponding air conveying cover, and the upper end of each hollow stirring pipe is provided with an air inlet hole in the corresponding air conveying cover.

[0023] The application is further provided that the surface of each hollow stirring pipe and each aeration stirring pipe is chelated with iron ions.

[0024] The application is further provided that a sludge discharge pump is arranged outside the sludge selection tank, the inlet end of the sludge discharge pump is communicated with the granular sludge precipitation area through the seventh liquid suction pipe, and the outlet end of the sludge discharge pump is communicated with the seventh liquid discharge pipe.

[0025] The application is further provided that an ozone disinfection tank is arranged on one side of the sludge separation tank, the free end of the third liquid discharge pipe extends into the inlet of the ozone disinfection tank, the outlet of the ozone disinfection tank is communicated with a drain pipe, an ozone aeration pipe is arranged in the ozone disinfection tank, and the inlet end of the ozone aeration pipe is communicated with an ozone generator.

[0026] The application is further provided that the SVI detection device for detecting the sludge SVI value in the sludge separation tank is further included.

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

[0028] Firstly, the sludge retention and hydraulic retention are effectively separated by the ultrafiltration membrane sleeve, and the separated sludge is recycled to the biochemical reaction tank for continuous use, so as to realize standard discharge of sewage and effective recovery of organic carbon source, and the circulation system capable of eliminating filamentous bacteria is formed in the biochemical reaction tank, so that the problem of sludge bulking is effectively treated, and the secondary sedimentation tank is replaced, so that the application has the advantages of compact structure and small space occupation.

[0029] Secondly, the sludge separation tank and the aeration function and the stirring function are integrated, and the two functions are effectively applied to sewage treatment and filamentous bacteria elimination treatment, on the one hand, the activated sludge and the sewage can be fully mixed during sewage treatment, so that good oxygen dissolving effect is obtained, and on the other hand, the destruction of filamentous bacteria under non-dissolved oxygen conditions is accelerated, and the elimination speed of filamentous bacteria is improved.

[0030] Thirdly, during the aeration and stirring process, the aeration stirring pipes on both sides of the ultrafiltration membrane sleeve continuously spray air on both sides of the ultrafiltration membrane sleeve, the generated bubbles can prevent the sludge on the surface of the ultrafiltration membrane sleeve from being blocked, the ultrafiltration membrane sleeve is not easy to be blocked during long-term use, and the cleaning frequency of the ultrafiltration membrane sleeve can be greatly reduced.

[0031] Fourthly, the sludge is separated by the inclined blocking inclined plate in the sludge separation tank, the granular sludge with large density, high strength, stable structure and easy separation is selected and returned to the biochemical reaction tank, so that the proportion of the relatively large granular sludge in the biochemical reaction tank can be effectively improved, the concentration of the activated sludge in the biochemical reaction tank can be effectively improved without adding carriers, and then the treatment efficiency of the sewage and the anti-shock load capacity are improved. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is the overall structure schematic diagram of the present application;

[0033] Figure 2 is the overall structure schematic diagram of the filter tank;

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

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

[0036] Figure 5 is the overall structure schematic diagram of the biochemical reaction tank;

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

[0038] Figure 7 for showing the connection of the hollow stirring pipe and the aeration stirring pipe;

[0039] Figure 8 is the overall structure schematic diagram of the ozone disinfection tank;

[0040] Figure 9 is the overall structure schematic diagram of the sludge selection tank;

[0041] Figure 10 is the sectional view of the sludge selection tank.

[0042] 1, filter tank; 2, rotating shaft; 3, coarse filter driving motor; 4, coarse grid plate; 5, coarse residue output machine; 6, scraping strip; 7, fine grid plate; 8, inclined chain; 9, scraping plate; 10, scraping tooth; 11, fine residue output machine; 12, vortex sedimentation tank; 13, lifting pump; 14, cutting surface inlet channel; 15, cutting surface outlet channel; 16, first liquid suction pipe; 17, first liquid discharge pipe; 18, sediment output channel; 19, spiral sedimentation conveying rod; 20, sediment discharge motor; 21, sediment discharge port; 22, oil scum separation tank; 23, air floatation aeration zone; 24, froth discharge zone; 25, air floatation aeration pipe; 26, microporous aeration disc; 27, air floatation aerator; 28, oil scum output groove; 29, oil scum inlet notch; 30, froth blocking strip; 31, spiral oil scum conveying rod; 32, oil scum discharge motor; 33, froth discharge port; 34, biochemical reaction tank; 35, ammoniation reaction zone; 36, nitrification reaction zone; 37, denitrification reaction zone; 38, flow guide channel; 39, oxygenation aeration pipe; 40, oxygenation aeration disc; 41, oxygenation aerator; 42, mixing agitator motor; 43, mixing agitator; 44, sludge separation tank; 45, sewage transfer pump; 46, second liquid suction pipe; 47, second liquid discharge pipe; 48, negative pressure pipe; 49, ultrafiltration membrane sleeve; 50, negative pressure pump; 51, third liquid suction pipe; 52, third liquid discharge pipe; 53, SVI detection device; 54, gas conveying cover; 55, cleaning agitator motor; 56, hollow agitator pipe; 57, gas inlet hole; 58, aeration agitator pipe; 59, aeration hole; 60, cleaning aeration pump; 61, gas conveying pipe; 62, sludge selection tank; 63, mixed feed zone; 64, sludge selection zone; 65, barrier inclined plate; 66, granular sludge sedimentation zone; 67, sludge selection pump; 68, fourth liquid suction pipe; 69, fourth liquid discharge pipe; 70, sludge circulation pump; 71, fifth liquid suction pipe; 72, fifth liquid discharge pipe; 73, sludge removal pump; 74, sixth liquid suction pipe; 75, sixth liquid discharge pipe; 76, sludge discharge pump; 77, seventh liquid suction pipe; 78, seventh liquid discharge pipe; 79, ozone disinfection tank; 80, drain pipe; 81, ozone aeration pipe. DETAILED DESCRIPTION

[0043] The intelligent urban sewage treatment system according to the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present application will be more apparent according to the following description. It should be noted that the accompanying drawings are very simplified and use non-precise proportions, only for the purpose of facilitating and clarifying the description of the embodiments of the present application. The same or similar reference signs in the drawings represent the same or similar components.

[0044] Embodiment, refer to Figures 1-10The utility model relates to an intelligent urban sewage treatment system, which comprises a filter tank 1, a coarse grid filter device and a fine grid filter device arranged in the filter tank 1. The coarse grid filter device comprises a rotating shaft 2 horizontally connected to the filter tank 1, a coarse filter driving motor 3 arranged on one side of the filter tank 1 for driving the rotating shaft 2 to rotate, five coarse grid plates 4 arranged outside the rotating shaft 2, and a plurality of strip holes in each coarse grid plate 4 passing through the free edge thereof. An arc-shaped groove (not shown) is arranged at the bottom of the filter tank 1 and matched with the rotation of the coarse grid plate 4. During the rotation of the coarse grid plate 4, large impurities in the sewage are intercepted. A coarse residue output machine 5 is horizontally arranged on the side of the coarse grid filter device close to the fine grid filter device. A plurality of scraping strips 6 corresponding to the strip holes of the coarse grid plate 4 are arranged on the side of the coarse residue output machine 5 facing the coarse grid filter device, for hanging the impurities on the coarse grid plate 4 into the coarse residue output machine 5. One end of the coarse residue output machine 5 extends out of the filter tank 1, and the intercepted large impurities are finally transported and discharged through the coarse residue output machine 5.

[0045] The fine grid filter device comprises a fine grid plate 7 inclined away from the coarse grid filter device. The fine grid plate 7 intercepts fine impurities passing through. Two inclined chains 8 are arranged on the two inner walls of the filter tank 1 close to the fine grid plate 7 of the coarse grid filter device. The two inclined chains 8 are matched and connected with a plurality of scraper plates 9. The free edge of each scraper plate 9 is provided with a scraping tooth 10 matched with the strip hole of the fine grid plate 7, for scraping the impurities in the strip hole of the fine grid plate 7. A fine residue 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 residue output machine 11 is close to the upper edge of the fine grid plate 7. One end of the fine residue output machine 11 extends out of the filter tank 1. The intercepted fine impurities are finally transported and discharged through the fine residue 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 tangential inlet channel 14 arranged along the tangential direction thereof. A tangential outlet channel 15 is arranged along the tangential direction of the side of the upper end of the vortex sedimentation tank 12 away from the tangential inlet channel 14. The inlet end of each lifting pump 13 extends into the outlet of the filter tank 1 through a first liquid suction pipe 16. The outlet end of each lifting pump 13 is connected with the tangential inlet channel 14 through a first liquid discharge pipe 17. After the sewage enters the vortex sedimentation tank 12 through the tangential inlet channel 14, a rotating vortex flow is formed in the vortex sedimentation tank 12. Under the action of the vortex centrifugal force, the large particles of sand quickly settle to the bottom of the vortex sedimentation tank 12. The bottom of the vortex sedimentation tank 12 is connected with a sludge output channel 18 arranged obliquely upward. A spiral sludge conveying rod 19 is rotatably connected in the sludge output channel 18. A sludge discharge motor 20 is arranged at the free end of the sludge output channel 18 for driving the spiral sludge conveying rod 19 to rotate. A sludge discharge port 21 is arranged at the upper end of the sludge output channel 18. Finally, the sand particles at the bottom of the vortex sedimentation tank 12 are discharged upward by the rotation of the spiral sludge conveying rod 19.

[0047] An oil and dirt separation tank 22 is arranged at one side of the vortex sedimentation tank 12. The oil and dirt separation tank 22 is divided into a U-shaped air flotation aeration zone 23 and a froth discharge zone 24. The free end of the tangential outlet channel 15 is connected with the end of the air flotation aeration zone 23 away from the froth discharge zone 24. Two air flotation aeration pipes 25 are arranged at the bottom of the air flotation aeration zone 23. A plurality of micro-porous aeration discs 26 are arranged on the air flotation aeration pipes 25. A plurality of air flotation aerators 27 are arranged outside the oil and dirt separation tank 22 and are connected with the air flotation aeration pipes 25. The micro-bubbles generated by the micro-porous aeration discs 26 adsorb the oil and dirt in the sewage and float to the water surface. An oil froth discharge device is arranged at the upper end of the froth discharge zone 24 for discharging the oil froth floating on the surface of the sewage out of the froth discharge zone 24. The oil froth discharge device includes an oil froth output groove 28 arranged horizontally at the upper end of the froth discharge zone 24. An oil froth entering gap 29 with a height only allowing the oil froth to enter is arranged downward at one side of the oil froth output groove 28 connected with the air flotation aeration zone 23. A froth blocking strip 30 is arranged downward at the edge of the oil froth entering gap 29 for blocking the froth from flowing with the sewage. The oil froth finally gradually enters the oil froth output groove 28 in the accumulation process. One end of the oil froth output groove 28 extends out of the froth discharge zone 24. A spiral oil froth conveying rod 31 is rotatably connected in the oil froth output groove 28. An oil froth discharge motor 32 is arranged at the free end of the oil froth output groove 28 for driving the spiral oil froth conveying rod 31 to rotate. A froth discharge port 33 is arranged at the end of the oil froth output groove 28 extending out of the froth discharge zone 24. Finally, the oil froth is discharged by the rotation of the spiral oil froth conveying rod 31.

[0048] A biochemical reaction tank 34 is arranged outside the oil separation tank 22 on one side. The biochemical reaction tank 34 is divided into an ammoniation reaction zone 35, a nitrification reaction zone 36 and a denitrification reaction zone 37 in sequence. In the ammoniation reaction zone 35, ammoniation is carried out, in which organic nitrogen compounds are decomposed into ammonia nitrogen (NH4 + ) by microorganisms. After ammoniation, nitrification is carried out in the nitrification reaction zone 36 under aerobic conditions, which is a process of converting ammonia nitrogen into nitrate. Finally, denitrification is carried out in the denitrification reaction zone 37 under anaerobic conditions, in which nitrate is reduced to nitrogen (N2) and released into the atmosphere. The inlet of the ammoniation reaction zone 35 is connected to the end of the defoaming zone 24 away from the air flotation aeration zone 23 through a flow guide channel 38. The bottom of the nitrification reaction zone 36 is provided with a plurality of oxygenation aeration pipes 39, and the oxygenation aeration pipes 39 are provided with a plurality of oxygenation aeration discs 40. A plurality of oxygenation aerators 41 are arranged outside the biochemical reaction tank 34 and connected to the oxygenation aeration pipes 39. A plurality of mixing agitator motors 42 are arranged above the ammoniation reaction zone 35 and the denitrification reaction zone 37 of the biochemical reaction tank 34. The power output shaft of each mixing agitator motor 42 is connected downwardly to a mixing agitator 43, which promotes the mixing of sludge and sewage to enable sufficient reaction.

[0049] A sludge separation tank 44 is arranged outside the biochemical reaction tank 34 near the denitrification reaction zone 37. A sewage transfer pump 45 is arranged between the denitrification reaction zones 37 in the sludge separation tank 44. The inlet end of the sewage transfer pump 45 is connected to the outlet of the denitrification reaction zone 37 through a second liquid suction 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 porous support pipes (not shown). Each porous support pipe is sleeved 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 suction pipe 51. The suction of the negative pressure pump 50 generates negative pressure in the porous support pipe, accelerates the permeation of sewage through the ultrafiltration membrane sleeve 49, and retains 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. An SVI detection device 53 is further arranged for detecting the SVI value of the sludge in the sludge separation tank 44. The SVI detection device 53 adopts a Korean / BLTEC online activated sludge total index (SVI) system for intelligent detection of the SVI value in the sludge separation tank 44.

[0050] The upper end of the sludge separation tank 44 is provided with two hollow air supply covers 54, the upper end of each air supply cover 54 is provided with a cleaning stirring motor 55, the power output shaft of each cleaning stirring motor 55 is connected with a hollow stirring pipe 56 extending downward into the lower side of the ultrafiltration membrane sleeve 49, the power output shaft of each cleaning stirring motor 55 is connected with the upper end of the corresponding hollow stirring pipe 56 in the corresponding air supply cover 54, the upper end of each hollow stirring pipe 56 is provided with three air inlet holes 57 in the corresponding air supply cover 54, each hollow stirring pipe 56 is provided with a horizontal aeration stirring pipe 58 below and above the ultrafiltration membrane sleeve 49, the two aeration stirring pipes 58 are arranged in a cross shape, the surface of each hollow stirring pipe 56 and each aeration stirring pipe 58 is chelated with iron ions to promote the elimination of filamentous bacteria, the side of each aeration stirring pipe 58 facing the ultrafiltration membrane sleeve 49 is provided with a plurality of aeration holes 59, a cleaning aeration pump 60 is arranged outside the sludge separation tank 44, the outlet end of the cleaning aeration pump 60 is connected with a gas supply pipe 61 communicating with the upper end of each hollow stirring pipe 56, each air supply cover 54 is connected with the gas supply pipe 61, the aeration stirring pipes 58 on the upper and lower sides of the ultrafiltration membrane sleeve 49 are rotated to aerate and clean them to prevent sludge from adhering.

[0051] A sludge selection tank 62 is arranged on one side of 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 in the middle of the sludge selection area 64 and inclined upward, 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 be deposited on the upper surface of the blocking inclined plates 65 under the action of gravity and gradually sink into the granular sludge sedimentation area 66, the sludge with a greater density is more likely to be deposited, the height of the blocking inclined plates 65 is arranged to make it difficult for the granular sludge with a large density to pass through and easy for the sludge with a small density to pass through with water flow. A sludge selection pump 67 is arranged outside the sludge selection tank 62, the inlet end of the sludge selection pump 67 is connected with the sludge separation tank 44 through a fourth liquid suction pipe 68, the outlet end of the sludge selection pump 67 is connected with 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, the inlet end of the sludge circulation pump 70 is connected with the granular sludge sedimentation area 66 through a fifth liquid suction pipe 71, the outlet end of the sludge circulation pump 70 is connected with the inlet of the ammonification reaction area 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 arranged outside the sludge selection tank 62, the inlet end of the sludge removal pump 73 is communicated with the upper end of the sludge selection zone 64 through a sixth liquid suction pipe 74, the outlet end of the sludge removal pump 73 is communicated with a sixth liquid discharge pipe 75, the sludge with small density is discharged through the sludge removal pump 73 for dewatering treatment after passing through the gap of the blocking inclined plate 65. A sludge discharge pump 76 is arranged outside the sludge selection tank 62, the inlet end of the sludge discharge pump 76 is communicated with the granular sludge sedimentation zone 66 through a seventh liquid suction pipe 77, the outlet end of the sludge discharge pump 76 is communicated with a seventh liquid discharge pipe 78, the excess granular sludge is discharged for dewatering treatment.

[0053] An ozone disinfection tank 79 is arranged outside one side of the sludge separation tank 44, the free end of the third liquid discharge pipe 52 extends into the inlet of the ozone disinfection tank 79, the outlet of the ozone disinfection tank 79 is communicated with a drain pipe 80, the water after the final purification treatment is discharged, a plurality of ozone aeration pipes 81 are arranged in the ozone disinfection tank 79, the inlet end of the ozone aeration pipe 81 is communicated with an ozone generator (not shown).

[0054] Working principle: after the sewage is discharged into the filter tank 1, it firstly flows through the coarse grid filter device, intercepts the larger coarse slag, and is discharged outward through the coarse slag output machine 5, and then flows through the fine grid filter device, intercepts the smaller fine slag, and is discharged outward through the fine slag output machine 11;

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

[0056] After passing through the vortex sedimentation tank 12, the sewage flows into the oil separation tank 22, and in the air flotation aeration zone 23, the micro-bubble aeration is carried out, the generated micro-bubbles adsorb the oil in the sewage and float to the water surface to form oil foam, the oil foam flows to the oil foam discharge area 24 with the sewage, is blocked by the defoaming strip 30 of the oil foam output tank 28, and gradually accumulates to flow into the oil foam output tank 28, and the oil foam is discharged by the spiral oil foam conveying rod 31 rotating;

[0057] After passing through the oil separation tank 22, the sewage flows into the biochemical reaction tank 34, and in the ammonification reaction zone 35, the organic nitrogen compounds are decomposed into ammonia nitrogen by microorganisms, after ammonification, in the nitrification reaction zone 36, under the aeration condition of the oxygen increasing aeration disc 40, the nitrification is carried out to convert the ammonia nitrogen into nitrate, and finally in the denitrification reaction zone 37, the denitrification is carried out under the anaerobic condition to reduce the nitrate into nitrogen and release it into the atmosphere;

[0058] After flowing through the biochemical reaction tank 34, the sewage flows into the sludge separation tank 44. The suction of the negative pressure pump 50 generates negative pressure in the porous support tube, accelerates the sewage to permeate through the ultrafiltration membrane sleeve 49, and keeps the sludge in the sludge separation tank 44. The filtered sewage is discharged from the third liquid discharge pipe 52. During the process, the clean stirring motor 55 drives the aeration stirring pipe 58 to rotate continuously to stir the sludge and the sewage, 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 the process of aeration and stirring, 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 is started in reverse rotation to backwash the ultrafiltration membrane sleeve 49 to prevent clogging.

[0059] After flowing through the sludge separation tank 44, the sewage flows into the ozone disinfection tank 79 through the third liquid discharge pipe 52. The ozone is aerated and disinfected to discharge the treated water that meets the standards.

[0060] The SVI value in the sludge separation tank 44 is detected in real time by the SVI detection device 53. When the SVI is less than or equal to 130 ml / g, the sludge circulation system is started, and the sludge selection pump 67 works to draw the sewage and sludge in the sludge separation tank 44 into the mixed feed area 63 of the sludge selection tank 62. The sewage and sludge flow along the mixed feed area 63 into the granular sludge sedimentation area 66, and then flow upward along the sludge selection area 64 through the blocking inclined plate 65. The sludge with large density moves upward along the gap between the blocking inclined plates 65, and under the action of gravity, the sludge gradually sinks to the upper surface of the blocking inclined plate 65, and then gradually sinks to the granular sludge sedimentation area 66. The sludge with large density is more likely to settle, while the sludge with small density flows along the gap between the blocking inclined plates 65, and is finally discharged by the sludge removal pump 73 for dewatering treatment.

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

[0062] It should be noted that each embodiment in the present specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts of each embodiment can be referred to each other.

[0063] The above description is only a description of the preferred embodiments of the present application, and does not limit the scope of the present application. Any modification or modification made by a person skilled in the art according to the above disclosure is within the protection scope of the claims.

Claims

1. An intelligent urban sewage treatment system, comprising a filter tank (1), wherein a coarse grid filtering device and a fine grid filtering 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, The upper end of the vortex sedimentation tank (12) is communicated with a tangential inlet channel (14) arranged along the tangential direction of the section, the upper end of the vortex sedimentation tank (12) is arranged with a tangential outlet channel (15) along the tangential direction of the section away from the tangential inlet channel (14), the inlet end of the lifting pump (13) is extended into the outlet of the filter tank (1) through a first liquid suction pipe (16), the outlet end of the lifting pump (13) is communicated with the tangential inlet channel (14) through a first liquid discharge pipe (17), the bottom of the vortex sedimentation tank (12) is communicated with a sludge output channel (18) arranged obliquely upward, a spiral sedimentation conveying rod (19) is rotatably connected in the sludge output channel (18), a sludge discharge motor (20) for driving the spiral sedimentation conveying rod (19) to rotate is installed at the free end of the sludge output channel (18), and a sludge discharge port (21) is arranged at the upper end of the sludge output channel (18); An oil and dirt separation tank (22) is arranged outside the vortex sedimentation tank (12), the oil and dirt separation tank (22) is divided into a flotation aeration area (23) and a froth discharge area (24) communicated in a U-shaped mode, the free end of the tangential outlet channel (15) is communicated with one end of the flotation aeration area (23) away from the froth discharge area (24), the bottom of the flotation aeration area (23) is paved with a flotation aeration pipe (25), a plurality of microporous aeration discs (26) are arranged on the flotation aeration pipe (25), a flotation aerator (27) communicated with the flotation aeration pipe (25) is arranged outside the oil and dirt separation tank (22), and an oil froth discharge device for discharging the oil froth floating on the surface of the sewage out of the froth discharge area (24) is arranged at the upper end of the froth discharge area (24) in a transverse mode; A biochemical reaction tank (34) is arranged outside one side of the oil and dirt separation tank (22), the biochemical reaction tank (34) is divided into an ammonification reaction area (35), a nitrification reaction area (36) and a denitrification reaction area (37) communicated in sequence, the inlet of the ammonification reaction area (35) is communicated with one end of the froth discharge area (24) away from the flotation aeration area (23) through a flow guide channel (38), the bottom of the nitrification reaction area (36) is provided with an oxygenation aeration pipe (39), a plurality of oxygenation aeration discs (40) are arranged on the oxygenation aeration pipe (39), and an oxygenation aerator (41) communicated with the oxygenation aeration pipe (39) is arranged outside the biochemical reaction tank (34); The sludge separation tank (44) is provided outside the biochemical reaction tank (34) and close to one side of the denitrification reaction zone (37), a sewage transfer pump (45) is arranged between the denitrification reaction zone (37), the inlet end of the sewage transfer pump (45) is communicated with the outlet of the denitrification reaction zone (37) through a second liquid suction pipe (46), the outlet end of the sewage transfer pump (45) is communicated with 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 communicated with a plurality of horizontally arranged porous support pipes, each porous support pipe is sleeved 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 communicated with the negative pressure pipe (48) through a third liquid suction pipe (51), the outlet end of the negative pressure pump (50) is communicated with a third liquid discharge pipe (52), a plurality of cleaning stirring motors (55) are installed at the upper end of the sludge separation tank (44), the power output shaft of each cleaning stirring motor (55) is connected with a hollow stirring pipe (56) which extends downward into the lower part of the ultrafiltration membrane sleeve (49), an aeration stirring pipe (58) is arranged below and above each hollow stirring pipe (56), an aeration hole (59) is formed in the side of each aeration stirring pipe (58) which faces the ultrafiltration membrane sleeve (49), a cleaning aeration pump (60) is arranged outside the sludge separation tank (44), the outlet end of the cleaning aeration pump (60) is communicated with a gas conveying pipe (61) which is communicated with the upper end of each hollow stirring pipe (56). A sludge selection tank (62) is arranged outside the sludge separation tank (44), and the sludge selection tank (62) is divided into a mixed feed area (63) and a sludge selection area (64). A plurality of barrier inclined plates (65) are arranged in the middle of the sludge selection area (64) and inclined upward. A granular sludge precipitation area (66) is formed below the barrier inclined plates (65) in the sludge selection tank (62). The mixed feed area (63) is in communication with the granular sludge precipitation area (66). The height of the barrier inclined plates (65) is arranged so that the granular sludge with large density is not easy to pass through, and the sludge with small density is easy to pass through with water flow. A sludge selection pump (67) is arranged outside the sludge selection tank (62). The inlet end of the sludge selection pump (67) is in communication with the sludge separation tank (44) through a fourth liquid suction pipe (68). The outlet end of the sludge selection pump (67) is in communication with 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). The inlet end of the sludge circulation pump (70) is in communication with the granular sludge precipitation area (66) through a fifth liquid suction pipe (71). The outlet end of the sludge circulation pump (70) is in communication with the inlet of the ammonification reaction area (35) through a fifth liquid discharge pipe (72). A sludge removal pump (73) is arranged outside the sludge selection tank (62). The inlet end of the sludge removal pump (73) is in communication with the upper end of the sludge selection area (64) through a sixth liquid suction pipe (74). The outlet end of the sludge removal pump (73) is in communication with a sixth liquid discharge pipe (75).

2. The intelligent urban sewage treatment system according to claim 1, characterized in that, The coarse grid filtering device comprises a rotating shaft (2) transversely connected to the filtering tank (1). A coarse filtering driving motor (3) is arranged on one side of the filtering tank (1) to drive the rotation of the rotating shaft (2). A plurality of coarse grid plates (4) are arranged outside the rotating shaft (2). The strip holes on each coarse grid plate (4) pass through the free edge thereof. An arc-shaped groove is arranged at the bottom of the filtering tank (1) to match the rotation of the coarse grid plate (4). A coarse residue output machine (5) is arranged transversely on one side of the coarse grid filtering device close to the fine grid filtering device. The coarse residue output machine (5) is provided with a strip scraping device (6) corresponding to the strip holes of the coarse grid plate (4) on one side of the coarse grid filtering device. One end of the coarse residue output machine (5) extends out of the filtering tank (1).

3. The intelligent urban sewage treatment system according to claim 1, characterized in that, The fine grid filter device comprises a fine grid plate (7) inclined away from the coarse grid filter device, two inner walls of the filter tank (1) are provided with inclined chains (8) near the fine grid plate (7) close to the coarse grid filter device, and the two inclined chains (8) are connected with a plurality of scrapers (9) in cooperation, the free edge of each scraper (9) is provided with a scraping tooth (10) matched with the strip hole of the fine grid plate (7), a fine slag output machine (11) is transversely arranged on one 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 edge 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, characterized in that, The oil foam discharge device comprises an oil foam output groove (28) transversely arranged at the upper end of the oil foam discharge area (24), the oil foam output groove (28) is downwardly provided with an oil foam entering gap (29) with a height only allowing oil foam to enter, the oil foam entering gap (29) is downwardly provided with a foam blocking strip (30) at the edge, one end of the oil foam output groove (28) extends out of the oil foam discharge area (24), a spiral oil foam conveying rod (31) is rotatably connected in the oil foam output groove (28), a oil foam discharge motor (32) for driving the spiral oil foam conveying rod (31) to rotate is mounted at the free end of the oil foam output groove (28), and the oil foam output groove (28) is provided with a foam discharge port (33) at the end extending out of the oil foam discharge area (24).

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

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

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

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

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

10. The intelligent urban sewage treatment system according to claim 9, characterized in that, The SVI detection device (53) for detecting the sludge SVI value in the sludge separation tank (44) is further included.

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