Integrated micro-power circulating sewage treatment device

Abstract

The application relates to an integrated micro-power circulating sewage treatment device, which comprises a vertical reaction cylinder and a nitrification liquid reflux pipe and a sludge reflux pipe outside the reaction cylinder, the reaction cylinder is a sleeve layer structure, the inner layer is a biochemical treatment zone, and the outer layer is an auxiliary post-treatment zone; the biochemical treatment zone comprises an anoxic zone, an anaerobic zone and a comprehensive zone from bottom to top, the comprehensive zone is a sleeve layer structure, the inner layer is a sedimentation zone, and the outer layer is an aerobic zone, the bottom of the anoxic zone is provided with a water inlet pipe, the top of the aerobic zone is connected with the sedimentation zone through a first water conveying pipe, and the water body treated in the aerobic zone is input into the sedimentation zone; the inlet end and the outlet end of the sludge reflux pipe penetrate into the reaction cylinder, the inlet end of the sludge reflux pipe is connected with the bottom of the sedimentation zone, and the outlet end of the sludge reflux pipe is connected with the anoxic zone; the inlet end and the outlet end of the nitrification liquid reflux pipe penetrate into the reaction cylinder, the inlet end of the nitrification liquid reflux pipe is connected with the aerobic zone, and the outlet end of the nitrification liquid reflux pipe is connected with the anoxic zone.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and in particular relates to an integrated micro-power circulation sewage treatment device. Background Art

[0002] Currently, biochemical wastewater treatment technology is relatively mature, with a variety of process types developed. These require the installation of multiple tanks, including anaerobic, anoxic, aerobic, and sedimentation tanks. This requires significant floor space, and the utilization of both equipment and tanks needs to be improved. Sludge and nitrification liquid return pipes and associated pumps are typically installed between the aerobic and anoxic tanks. This transport and return of sludge consumes significant energy, leading to higher overall operating costs. Furthermore, the total nitrogen removal rate of traditional process equipment still needs to be improved to meet increasingly stringent wastewater discharge standards. Summary of the Invention

[0003] To address the above problems, the present invention provides an integrated micro-power circulation sewage treatment device, comprising a vertical reaction tube and a nitrification liquid return pipe and a sludge return pipe outside the reaction tube. The reaction tube is a jacketed structure, with the inner layer being a biochemical treatment zone and the outer layer being an auxiliary post-treatment zone.

[0004] The biochemical treatment area includes an anoxic zone, an anaerobic zone and a comprehensive zone from bottom to top. The comprehensive zone is a nested structure, with the inner layer being the sedimentation zone and the outer layer being the aerobic zone. A water inlet pipe is provided at the bottom of the anoxic zone, and the top of the aerobic zone is connected to the sedimentation zone through a first water pipe, which feeds the treated water from the aerobic zone into the sedimentation zone.

[0005] The inlet and outlet ends of the sludge return pipe both penetrate into the reaction cylinder, the inlet end of the sludge return pipe is connected to the bottom of the sedimentation zone, and the outlet end of the sludge return pipe is connected to the anoxic zone; the inlet and outlet ends of the nitrification liquid return pipe both penetrate into the reaction cylinder, the inlet end of the nitrification liquid return pipe is connected to the aerobic zone, and the outlet end of the nitrification liquid return pipe is connected to the anoxic zone.

[0006] The present invention uses a modified AAO process, namely an anoxic, anaerobic, aerobic, and sedimentation process, resulting in a high denitrification efficiency. Granular sludge in the anoxic zone uses organic pollutants in the raw sewage as a carbon source for denitrification. The sewage then rises to the anaerobic zone, which is isolated from the atmosphere above, below, and on all sides, maintaining a good, completely anaerobic environment that is conducive to the complete release of phosphorus by phosphate-accumulating bacteria. The sewage then rises to the aerobic zone, where the activated sludge undergoes aerobic respiration in an environment of 2-4 mg / L of dissolved oxygen, further breaking down organic matter into inorganic matter.

[0007] Because the aerobic and sedimentation zones are located above the anoxic zone, pumps are used to return the nitrification solution and sludge. This static pressure differential between the aerobic, sedimentation, and anoxic zones significantly reduces the head required by the pumps, achieving micro-power circulation and significantly saving energy and operating costs. This invention replaces traditional flat-type sewage treatment equipment with a vertical reactor, saving approximately 30%-60% of the sewage treatment plant's floor space.

[0008] Optionally, the anoxic zone contains granular sludge and a water distributor is provided at the bottom;

[0009] The water distributor is a water pipe that is spirally coiled several times on the same plane, with water outlets evenly distributed on both sides of the water pipe, and the water outlets are arranged in a downward tilt;

[0010] One side of the water distributor is connected to the water inlet pipe, and the other side is connected to the backwash pipe 1, which can realize online backwashing and ensure the continuous operation of the reaction tube.

[0011] Optionally, the top of the anoxic zone is connected to the anaerobic zone, which contains granular sludge. The side wall is connected to sampling tube 2 and ORP detector 2, which are used to detect the sludge and water quality in the anaerobic zone in real time. The outlet of sampling tube 2 and ORP detector 2 both pass through the outer wall of the reaction cylinder and are outside the reaction cylinder.

[0012] Optionally, the bottom of the aerobic zone and the bottom of the sedimentation zone are at the same height, and the side wall of the sedimentation zone separates the aerobic zone from the sedimentation zone; a partition plate is provided between the aerobic zone and the anaerobic zone to separate the aerobic zone and the anaerobic zone; the partition plate is annular, the center of the partition plate corresponding to the bottom of the sedimentation zone is left vacant, and there is a gap between the inner edge of the partition plate and the bottom of the sedimentation zone, and the gap becomes a water flow zone, and the water flow zone is provided with a partition net to allow water in the anaerobic zone to rise into the aerobic zone;

[0013] Aeration pipes 1 are evenly arranged on the partition plate, and the air inlet end of the aeration pipe 1 extends to the top of the aerobic zone and is connected to an external aeration fan to provide oxygen for the aerobic zone.

[0014] Further optionally, a water outlet weir is provided on the outer surface of the side wall of the sedimentation zone, and the water outlet weir is located at the top of the aerobic zone and surrounds the sedimentation zone, so that the water treated in the aerobic zone enters the water outlet weir evenly; a first water pipe is provided at any position at the bottom of the water outlet weir, and the first water pipe passes through the side wall of the sedimentation zone and enters the sedimentation zone.

[0015] Optionally, a water inlet stabilizing bucket is provided in the center of the sedimentation area, and the first water delivery pipe is connected to the upper part of the water inlet stabilizing bucket to deliver the water in the outlet weir into the water inlet stabilizing bucket;

[0016] An overflow weir is provided on the top of the sedimentation zone, which circles the sedimentation zone. The bottom of the overflow weir is connected to a second water pipe for outputting the supernatant in the sedimentation zone.

[0017] Optionally, the auxiliary post-processing area is annular and is provided with a filtration area, a clean water area and a sludge treatment area in sequence. The second water delivery pipe is connected to the top of the filtration area, and a filtration layer is provided inside the filtration area. The filtration area is connected to the clean water area through a pipe. The clean water area is provided with a water production pipe to output the treated water production to the reaction cylinder. The backwash pipe is connected to the clean water area, and the water in the clean water area is used to backwash the water distributor and the anoxic area.

[0018] The sludge treatment area is used to treat the calcified granular sludge in the anaerobic area. From bottom to top, it includes the filtration and capture area, the decalcification area and the first culture area. The anaerobic area is connected to one side of the filtration and capture area through a discharge pipe, and the clean water area is connected to the other side of the filtration and capture area through a second backwash pipe. The decalcification area is equipped with an aeration pipe 2 and a drug feed pipe for stirring the water in the decalcification area and inputting decalcification agent.

[0019] The anaerobic zone contains granular sludge. Generally, wastewater contains some calcium ions. After long-term operation, precipitated calcium salts will form and deposit on the surface of the granular sludge or enter the interior through the microporous channels of the granular sludge to form scale nuclei, making the surface or interior relatively solid. If you touch it with your hand, it will feel like stone. This means that the anaerobic granular sludge has calcified. After calcification, it will isolate the microorganisms from the substrate in the sewage, hindering the growth and metabolism of microorganisms, causing the sludge activity to decrease or even inactivate. To ensure the continuous operation of the anaerobic zone, in addition to the more expensive replacement of granular sludge, the calcified granular sludge must be decalcified and regenerated. Therefore, the sludge treatment zone is designed.

[0020] Further optionally, a plurality of mutually parallel filtering and capturing nets are evenly arranged in the filtering and capturing area along the circumference of the reaction cylinder, and the filtering and capturing nets are arranged obliquely and arranged in a row for filtering and capturing calcified granular sludge;

[0021] A discharge pipe is provided at the bottom of the anaerobic zone, the discharge pipe is connected to one end on the upstream side of the filtration and capture zone, and one end on the downstream side of the filtration and capture zone is connected to the second backwash pipe. The second backwash pipe is provided with a branch pipe and a main pipe, the branch pipe is connected to the anaerobic zone, and the main pipe is connected to the clean water zone;

[0022] A water inlet 1 is provided at the top of one end of the upstream side of the filtration and collection area, and is used to input the calcified granular sludge captured in the filtration and collection area into the decalcification area.

[0023] Further optionally, a vertical aeration pipe 2 is provided on each side wall of the decalcification zone, and the aeration pipe 2 is connected to an external aeration fan to provide pneumatic stirring for the decalcification zone;

[0024] A vertical drug inlet pipe is provided in the center of the decalcification area. Both sides of the drug inlet pipe are evenly and densely covered with through holes. The drug inlet pipe is connected to the external decalcification agent storage tank through a drug delivery pipe.

[0025] The clean water zone is connected to the decalcification zone via a backwash pipe to provide flushing water for the decalcification zone.

[0026] Further optionally, a second culture area is provided between the anaerobic area and the partition plate, and a second openable and closable partition is provided at the bottom of the second culture area to prevent excessive sludge from the anaerobic area from entering the second culture area, but allow sewage to enter the second culture area; the bottom of the first culture area is connected to the second culture area through a pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the structure of the integrated micro-power circulation sewage treatment device;

[0028] Figure 2 Schematic diagram of the cross section of the reaction tube;

[0029] Figure 3 This is a schematic diagram of the sludge treatment area;

[0030] Figure 4 Schematic diagram of a top view of the first culture area;

[0031] Figure 5 is a schematic cross-sectional view of the decalcified area;

[0032] Figure 6 Schematic diagram of the second culture zone and the anaerobic zone.

[0033] In the attached figure, 1-reaction cylinder, 2-nitrification liquid return pipe, 3-sludge return pipe, 4-biochemical treatment area, 5-auxiliary post-treatment area, 6-anoxic area, 7-anaerobic area, 8-sedimentation area, 9-aerobic area, 10-water inlet pipe, 11-water distributor, 12-backwash pipe 1, 13-partition plate, 14-water flow area, 15-aeration pipe 1, 16-outlet weir, 17-first water delivery pipe, 18-second water delivery pipe, 19-screen 2, 20-water inlet steady flow barrel, 21- Overflow weir, 22-filtration zone, 23-clear water zone, 24-filtration and collection zone, 25-decalcification zone, 26-first culture zone, 27-second culture zone, 28-discharge pipe, 29-backwash pipe 2, 30-aeration pipe 2, 31-drug feed pipe, 32-filtration and collection net, 33-branch pipe, 34-main pipe, 35-water outlet 1, 36-backwash pipe 3, 37-circulation pipe, 38-drug delivery pipe, 39-discharge pipe, 40-water outlet 2, 41-culture tube. DETAILED DESCRIPTION

[0034] This embodiment provides an integrated micro-power circulation sewage treatment device, such as Figures 1-6 As shown, it includes a vertical reaction tube 1 and a nitrification liquid return pipe 2 and a sludge return pipe 3 outside the reaction tube 1. The reaction tube 1 is a jacket structure, the inner layer is a biochemical treatment area 4, and the outer layer is an auxiliary post-treatment area 5;

[0035] The biochemical treatment zone 4 includes, from bottom to top, an anoxic zone 6, an anaerobic zone 7, and a comprehensive zone. The comprehensive zone is a jacketed structure, with the inner layer being a sedimentation zone 8 and the outer layer being an aerobic zone 9. A water inlet pipe 10 is provided at the bottom of the anoxic zone 6, and the top of the aerobic zone 9 is connected to the sedimentation zone 8 via a first water outlet pipe, so that the water treated in the aerobic zone 9 is fed into the sedimentation zone 8.

[0036] The inlet and outlet ends of the sludge return pipe 3 both penetrate into the reaction cylinder 1, the inlet end of the sludge return pipe 3 is connected to the bottom of the sedimentation zone 8, and the outlet end of the sludge return pipe 3 is connected to the anoxic zone 6; the inlet and outlet ends of the nitrification liquid return pipe 2 both penetrate into the reaction cylinder 1, the inlet end of the nitrification liquid return pipe 2 is connected to the aerobic zone 9, and the outlet end of the nitrification liquid return pipe 2 is connected to the anoxic zone 6.

[0037] Optionally, the reaction tube 1 is cylindrical, the biochemical treatment zone 4 and the auxiliary post-treatment zone 5 are concentrically arranged, and the aerobic zone 9 and the precipitation zone 8 are concentrically arranged.

[0038] Optionally, the anoxic zone 6 contains granular sludge, a water distributor 11 is provided at the bottom, and the side wall is connected to a sampling tube 1 and an ORP detector 1, which are used to detect the sludge and water quality in the anoxic zone 6 in real time. The outlet of the sampling tube 1 and the ORP detector 1 both pass through the outer wall of the reaction cylinder 1 and are outside the reaction cylinder 1.

[0039] Further optionally, the water distributor 11 is a water pipe spirally wound several times on the same plane, with water outlets evenly distributed on both sides of the water pipe. The water outlets are arranged to be tilted downward to evenly input the incoming water into the anoxic zone 6 and prevent sludge from clogging the water outlets; the tilt angle of the water outlets is 45-60°;

[0040] One side of the water distributor 11 is connected to the water inlet pipe 10, and the other side is connected to the backwash pipe 12, which can realize online backwashing and ensure the continuous operation of the reaction tube 1. The water inlet pipe 10 penetrates the anoxic zone 6 from the outside of the reaction tube 1.

[0041] Optionally, a filter screen 1 is provided on the top of the anoxic zone 6 to allow sewage from the anoxic zone to enter the anaerobic zone 7. The anaerobic zone 7 contains granular sludge. The side wall is connected to a sampling tube 2 and an ORP detector 2, which are used to detect the sludge and water quality in the anaerobic zone 7 in real time. The outlet of the sampling tube 2 and the ORP detector 2 both pass through the outer wall of the reaction cylinder 1 and are located outside the reaction cylinder 1.

[0042] The return nitrification liquid from the aerobic zone 9 and the return sludge from the sedimentation zone 8 enter the lower portion of the anoxic zone 6. With the synergistic effect of the water distributor 11, granular sludge forms in the anoxic zone 6, generating a fluidized flow. This sludge reaches a concentration of 6,000-10,000 mg / L, resulting in high denitrification efficiency. The generated nitrogen dioxide flows upward through the anaerobic zone 7 and aerobic zone 9, assisting in the mixing of mud and water in the anaerobic zone 7 and aerobic tank. The water in the anoxic zone 6 flows upward into the anaerobic zone 7, causing the granular sludge in the anaerobic zone 7 to also fluidize. The granulated sludge formed in the anoxic and anaerobic zones 6 and 7 is highly active, increasing denitrification efficiency by approximately 8-15% compared to conventional processes. Biological phosphorus removal primarily relies on the anaerobic release of phosphorus. After this release, the aerobic sludge absorbs phosphorus, significantly removing phosphorus from the wastewater. The present invention improves total phosphorus removal efficiency by approximately 10-20% compared to conventional processes, eliminating the need for chemical phosphorus removal units and significantly reducing construction and operating costs.

[0043] The water distributor corresponds to the middle of the anoxic zone. Its lateral area is 70-85% of the cross-sectional area of ​​the anoxic zone. This creates an upward flow in the middle of the anoxic zone and a downward flow near the edge of the anoxic zone, driving the circulation of granular sludge. The same granular sludge circulation also occurs in the anaerobic zone.

[0044] Optionally, the bottom of the aerobic zone 9 and the bottom of the sedimentation zone 8 are at the same height, and the side wall of the sedimentation zone 8 separates the aerobic zone 9 from the sedimentation zone 8; a partition plate 13 is provided between the aerobic zone 9 and the anaerobic zone 7 for separating the aerobic zone 9 from the anaerobic zone 7; the partition plate 13 is annular, and the center of the partition plate 13 corresponding to the bottom of the sedimentation zone 8 is left vacant, and there is a gap between the inner edge of the partition plate 13 and the bottom of the sedimentation zone 8, which becomes a water flow zone 14, and the water flow zone 14 is provided with a partition net 1, allowing water from the anaerobic zone 7 to rise into the aerobic zone 9;

[0045] Aeration pipes 15 are evenly arranged on the partition plate 13 . The air inlet end of the aeration pipe 15 extends to the top of the aerobic zone 9 and is connected to an external aeration fan to provide oxygen to the aerobic zone 9 .

[0046] Further optionally, a water outlet weir 16 is provided on the outer surface of the side wall of the sedimentation zone 8. The water outlet weir 16 is located at the top of the aerobic zone 9 and surrounds the sedimentation zone 8, so that the water treated in the aerobic zone 9 enters the water outlet weir 16 evenly; a first water pipe 17 is provided at any position at the bottom of the water outlet weir 16, and the first water pipe 17 passes through the side wall of the sedimentation zone 8 and enters the sedimentation zone 8.

[0047] Optionally, a water inlet stabilizing flow bucket 20 is provided in the center of the sedimentation zone 8. The top of the water inlet stabilizing flow bucket 20 is fixed to the top surface of the reaction cylinder 1, and the bottom is located in the middle and lower part of the sedimentation zone 8. A reflector is provided to ensure that the water inlet stabilizing flow bucket 20 evenly inflows water into the sedimentation zone 8. The first water supply pipe 17 is connected to the upper part of the water inlet stabilizing flow bucket 20 to input the water in the water outlet weir 16 into the water inlet stabilizing flow bucket 20.

[0048] The bottom of the sedimentation zone 8 is conical to facilitate the collection of sludge; an overflow weir 21 is provided at the top of the sedimentation zone 8, which surrounds the sedimentation zone 8. The bottom of the overflow weir 21 is connected to the second water pipe 18 for outputting the supernatant of the sedimentation zone 8.

[0049] Optionally, the auxiliary post-processing zone 5 is annular and is provided with a filtration zone 22, a clean water zone 23 and a sludge treatment zone in sequence. The second water pipe 18 is connected to the top of the filtration zone 22, and a filtration layer is provided inside the filtration zone 22; the filtration zone 22 is connected to the clean water zone 23 through a pipe, and the clean water zone 23 is provided with a water production pipe to output the treated water production to the reaction cylinder 1. The backwash pipe 12 is connected to the clean water zone 23, and the water from the clean water zone 23 is used to backwash the water distributor 11 and the anoxic zone 6;

[0050] The sludge treatment area is used to treat the calcified granular sludge in the anaerobic zone 7. From bottom to top, it includes a filtration and collection zone 24, a decalcification zone 25 and a first culture zone 26. The anaerobic zone 7 is connected to one side of the filtration and collection zone 24 through a discharge pipe 28, and the clean water zone 23 is connected to the other side of the filtration and collection zone 24 through a backwash pipe 29. The decalcification zone 25 is provided with an aeration pipe 20 and a drug feed pipe 31 for stirring the water in the decalcification zone 25 and inputting decalcification agent.

[0051] Further optionally, the filtration area 22 occupies 1 / 4 of the annular volume, the top of the filtration area 22 is flush with the top of the reaction tube 1, and the bottom of the filtration area 22 is in the middle of the reaction tube 1;

[0052] The filter layer includes an upper quartz sand filter material and a lower pebble support layer. The particle size of the quartz sand filter material is 1.2-1.4 mm, and the thickness of the pebble support layer is 2-5 μm. The thickness of the quartz sand filter material is adjusted according to the actual water quality of the supernatant in the sedimentation zone 8.

[0053] The water in the filter area 22 flows from top to bottom. An opening is provided at the bottom of the filter area 22 for communicating with the clean water area 23 .

[0054] Further optionally, the clean water zone 23 occupies 1 / 4 of the annular volume, the bottom of the clean water zone 23 is flush with the bottom of the reaction tube 1, and the top of the clean water zone 23 is in the middle of the reaction tube 1; the opening at the bottom of the filtration zone 22 is connected to the top of the clean water zone 23, and the filtered water flows to the clean water zone 23 by gravity, saving water transportation energy consumption; the water production pipe is connected to the bottom of the clean water zone 23.

[0055] Further optionally, the sludge treatment area occupies 1 / 2 of the annular volume, and a plurality of mutually parallel filter capture nets 32 are evenly arranged in the filtration and capture area 24 along the circumference of the reaction cylinder 1. The filter capture nets 32 are arranged obliquely and arranged in a row to filter and capture calcified granular sludge; the inclination angle of the filter capture nets is 15-45 degrees, and the two sides of the filter capture nets are fixed to the two sides of the filter capture area;

[0056] A discharge pipe 28 is provided at the bottom of the anaerobic zone 7. The discharge pipe 28 is connected to the upstream end of the filter and capture zone 24 to input the calcified granular sludge and part of the sewage at the bottom of the anaerobic zone 7 into the filter and capture zone 24. The downstream end of the filter and capture zone 24 is connected to the second backwash pipe 29. The second backwash pipe 29 is provided with a branch pipe 33 and a main pipe 34. The branch pipe 33 is connected to the anaerobic zone 7, and the main pipe 34 is connected to the clean water zone 23.

[0057] A water inlet 35 is provided at the top of one end of the upstream side of the filtering and capturing zone 24 , for inputting the calcified granular sludge captured by the filtering and capturing zone 24 into the decalcification zone 25 .

[0058] The filter-collection net 32 ​​in the filter-collection zone 24 filters and captures calcified granular sludge. Uncalcified granular sludge, which is slightly smaller in size, passes through the filter-collection net 32 ​​along with the sewage and then returns to the anaerobic zone 7 via branch pipe 33. When the sludge on the filter-collection net 32 ​​becomes excessive, the discharge pipe 28 and branch pipe 33 are closed, and the main pipe 34 is opened to introduce clean water from the clean water zone 23 into the filter-collection zone 24, backwashing the filter-collection zone 24 net. The intercepted calcified granular sludge is then transferred to the decalcification zone 25 through the switchable water inlet 35. After the material is discharged, the filter-collection zone 24 can be used to capture the next batch of calcified granular sludge. The anaerobic zone 7 is higher than the filter-collection zone 24, saving energy during material transportation. The bottom of the clean water zone 23 is at the same height as the bottom of the filter-collection zone 24, allowing for parallel water transportation, also saving energy.

[0059] Further optionally, the decalcification zone 25 is located in the middle of the auxiliary post-processing zone 5, and a vertical aeration pipe 2 30 is provided on each side wall of the decalcification zone 25, and the aeration pipe 2 30 is connected to an external aeration fan to provide pneumatic stirring for the decalcification zone 25;

[0060] A vertical drug inlet pipe 31 is provided in the center of the decalcification zone 25. Both sides of the drug inlet pipe 31 are evenly and densely covered with through holes. The drug inlet pipe 31 is connected to an external decalcification agent storage tank through a drug delivery pipe 38.

[0061] The clean water zone 23 is connected to the decalcification zone 25 via a backwash pipe 3 36 to provide flushing water for the decalcification zone 25 .

[0062] Further optionally, the bottom of the decalcification zone 25 is connected to a circulation pipe 37, and the circulation pipe 37 is connected to a drug delivery pipe 38; a discharge pipe 39 is provided in the lower middle portion of the decalcification zone 25 for discharging excess material in the decalcification zone 25;

[0063] A second water inlet 40 that can be switched is provided on the top surface of the decalcification zone 25 for feeding the decalcified granular sludge from the decalcification zone 25 into the first culture zone 26 .

[0064] The aeration pipe 2 30 and the drug feed pipe 31 have the same height, both slightly lower than the height of the decalcification zone 25. The cross-section of the decalcification zone 25 is semicircular. The aeration pipes 2 30 on both sides of the decalcification zone 25 push the granular sludge on both sides of the decalcification zone 25 toward the middle of the decalcification zone 25 through aeration. At the same time, the drug feed pipe 31 discharges drugs through both sides, so that the decalcification agent (phosphoric acid or phosphoric acid solution) is fully in contact with the granular sludge, and promotes the granular sludge and decalcification agent to flow back and forth between the aeration pipe 2 30 and the drug feed pipe 31 for full reaction.

[0065] Calcified granular sludge is carried by clean water from water inlet 1 35 into the decalcification zone 25. After the particles on the filter capture net 32 ​​are rinsed clean, the clean water flow is stopped and water inlet 1 35 is closed. At this point, the liquid level in the decalcification zone 25 is low, and the drug feed pipe 31 begins feeding the drug. Aeration pipe 2 30 begins aeration, and the liquid level gradually rises. When the liquid level reaches the top of the decalcification zone 25, the decalcification agent storage tank stops feeding the drug feed pipe 31. Aeration pipe 2 30 is evenly distributed with several hinged air nozzles that rotate up and down while aerating, disturbing the water and sludge and preventing the sludge from settling at the bottom. The decalcification reaction produces a calcium phosphate precipitate with a particle size smaller than the decalcified granular sludge. Under the pneumatic agitation, the precipitate separates from the granular sludge. Air bubbles occupy the uneven surface and micropores of the decalcified granular sludge, preventing the attachment and ingress of precipitate. The air bubbles also attract the precipitate, promoting its buoyancy and substantially separating it from the granular sludge. A filter screen 1 is provided at the inlet of the circulation pipe 37 to block granular sludge and sediment, allowing the liquid to return to the drug feed pipe 31 through the circulation pipe 37 and the drug delivery pipe 38 and continue to be sprayed into the decalcification area 25, thus forming a cycle and promoting the reaction.

[0066] After the reaction is completed, a filter screen 2 is provided at the entrance of the discharge pipe 39. The filter screen 2 only blocks the decalcified granular sludge, and the liquid and sediment in the decalcification zone 25 are discharged through the discharge pipe 39. The clean water zone 23 flows into the decalcification zone 25 through the backwash pipe 36, so that the liquid level in the decalcification zone 25 submerges all the decalcified granular sludge and cleans the sludge. Then, the clean water is discharged from the discharge pipe 39; water is then fed into the decalcification zone 25 through the backwash pipe 36, cleaned again, and then discharged from the discharge pipe 39. This repeated cleaning method also promotes the discharge of bubbles on the surface of the granular sludge and in the micropores. After the clean water enters for the last time, the discharge pipe 39 is closed, so that the granular sludge is discharged into the first culture zone 26 through the water inlet 2 40. After the material is discharged, the decalcification zone 25 can be used for the decalcification of the next batch of granular sludge.

[0067] Further optionally, the first culture zone 26 is located at the upper part of the auxiliary post-treatment zone 5, and a culture tube 41 is provided on the top of the first culture zone 26. The culture tube 41 is connected to the upper part of the anaerobic zone 7 to input sewage and activated sludge from the anaerobic zone 7 into the first culture zone 26 for culturing decalcified granular sludge so that biofilm re-attaches to the granular sludge.

[0068] Further optionally, a second culture area 27 is provided between the anaerobic area 7 and the partition plate 13, and an openable and closable partition 19 is provided at the bottom of the second culture area 27 to prevent excessive sludge in the anaerobic area 7 from entering the second culture area 27, but allow sewage to enter the second culture area 27; the bottom of the first culture area 26 is connected to the second culture area 27 through a pipeline.

[0069] Because granular sludge requires a long cultivation time, cultivating it exclusively in the first cultivation zone 26 can cause material to queue in the decalcification zone 25 and the filtration and capture zone 24, preventing continuous granular sludge regeneration. The present invention provides a second cultivation zone 27. Decalcified granular sludge completes its initial cultivation in the first cultivation zone 26 before being transferred to the second cultivation zone 27 for its final cultivation. This does not affect the biochemical treatment in the anaerobic zone 7. After cultivation is complete, the second screen 19 is opened, and the regenerated granular sludge is directly returned to the anaerobic zone 7. Because the bottom of the first cultivation zone 26 is above or approximately flush with the second cultivation zone 27, transferring material from the first cultivation zone 26 to the second cultivation zone 27 is more energy-efficient.

[0070] Since the calcification of the sludge in the anaerobic zone 7 varies according to the quality of the raw sewage, the discharge interval of each batch of calcified granular sludge is also different. If the water quality is hard (high in calcium), the second culture zone 27 is activated; if the water quality is soft, the first culture zone 26 can be used for a long time, and the partition screen 19 is opened. At this time, the second culture zone 27 serves as part of the anaerobic zone 7.

Claims

1. An integrated micro-power circulation sewage treatment device, characterized in that: It includes a vertical reaction tube and a nitrification liquid return pipe and a sludge return pipe outside the reaction tube. The reaction tube is a jacketed structure, with the inner layer being the biochemical treatment area and the outer layer being the auxiliary post-treatment area. The biochemical treatment area includes an anoxic zone, an anaerobic zone and a comprehensive zone from bottom to top. The comprehensive zone is a nested structure, with the inner layer being the sedimentation zone and the outer layer being the aerobic zone. A water inlet pipe is provided at the bottom of the anoxic zone, and the top of the aerobic zone is connected to the sedimentation zone through a first water pipe, which feeds the treated water from the aerobic zone into the sedimentation zone. The inlet and outlet ends of the sludge return pipe are both inserted into the reaction cylinder, the inlet end of the sludge return pipe is connected to the bottom of the sedimentation zone, and the outlet end of the sludge return pipe is connected to the anoxic zone; the inlet and outlet ends of the nitrification liquid return pipe are both inserted into the reaction cylinder, the inlet end of the nitrification liquid return pipe is connected to the aerobic zone, and the outlet end of the nitrification liquid return pipe is connected to the anoxic zone; A water distributor is provided at the bottom of the anoxic zone, one side of the water distributor is connected to the water inlet pipe, and the other side is connected to the backwash pipe 1, which can realize online backwashing; The auxiliary post-processing area is annular and is sequentially provided with a filtration area, a clean water area, and a sludge treatment area. The second water delivery pipe is connected to the top of the filtration area, and a filtration layer is provided inside the filtration area. The filtration area is connected to the clean water area through a pipe. The clean water area is provided with a water production pipe to output the treated water production to the reaction cylinder. The backwash pipe is connected to the clean water area, and the water in the clean water area is used to backwash the water distributor and the anoxic area. The sludge treatment area is used to treat the calcified granular sludge in the anaerobic area. From bottom to top, it includes the filtration and capture area, the decalcification area and the first culture area. The anaerobic area is connected to one side of the filtration and capture area through a discharge pipe, and the clean water area is connected to the other side of the filtration and capture area through a second backwash pipe. The decalcification area is equipped with an aeration pipe 2 and a drug feed pipe for stirring the water in the decalcification area and inputting decalcification agent.

2. The integrated micro-power circulation sewage treatment device according to claim 1 is characterized in that: There is granular sludge in the anoxic zone. The water distributor is a water pipe spirally coiled several times on the same plane. Water outlets are evenly and densely distributed on both sides of the water pipe, and the water outlets are arranged to be tilted downward.

3. The integrated micro-power circulation sewage treatment device according to claim 2 is characterized in that: The top of the anoxic zone is connected to the anaerobic zone, which contains granular sludge. The side wall is connected to sampling tube 2 and ORP detector 2, which are used to detect the sludge and water quality in the anaerobic zone in real time. The outlet of sampling tube 2 and ORP detector 2 both pass through the outer wall of the reaction cylinder and are outside the reaction cylinder.

4. The integrated micro-power circulation sewage treatment device according to claim 3 is characterized in that: The bottom of the aerobic zone and the bottom of the sedimentation zone are at the same height, and the side wall of the sedimentation zone separates the aerobic zone from the sedimentation zone; A partition is provided between the aerobic zone and the anaerobic zone to separate the aerobic zone and the anaerobic zone. The partition is in the shape of a ring, with the center of the partition corresponding to the bottom of the sedimentation zone left vacant. There is a gap between the inner edge of the partition and the bottom of the sedimentation zone, which serves as a water flow zone. A screen is provided in the water flow zone to allow water from the anaerobic zone to rise into the aerobic zone. Aeration pipes are evenly arranged on the partition plate to provide oxygen for the aerobic zone.

5. The integrated micro-power circulation sewage treatment device according to claim 4 is characterized in that: An outlet weir is provided on the outer surface of the side wall of the sedimentation zone. The outlet weir is located at the top of the aerobic zone and surrounds the sedimentation zone, so that the water treated in the aerobic zone enters the outlet weir evenly. A first water pipe is provided at any position at the bottom of the outlet weir. The first water pipe passes through the side wall of the sedimentation zone and enters the sedimentation zone.

6. The integrated micro-power circulation sewage treatment device according to claim 5 is characterized in that: A water inlet steady flow bucket is provided in the center of the sedimentation area, and the first water delivery pipe is connected to the upper part of the water inlet steady flow bucket to deliver the water in the outlet weir into the water inlet steady flow bucket; An overflow weir is provided on the top of the sedimentation zone, which circles the sedimentation zone. The bottom of the overflow weir is connected to a second water pipe for outputting the supernatant in the sedimentation zone.

7. The integrated micro-power circulation sewage treatment device according to claim 6 is characterized in that: In the filtering and collecting area, a plurality of filtering and collecting nets are evenly arranged along the circumference of the reaction cylinder and are parallel to each other. The filtering and collecting nets are arranged obliquely and arranged in a row to filter and collect calcified granular sludge. A discharge pipe is provided at the bottom of the anaerobic zone, which is connected to one end on the upstream side of the filtration and collection zone, and one end on the downstream side of the filtration and collection zone is connected to backwash pipe 2. Backwash pipe 2 is provided with a branch pipe and a main pipe, the branch pipe is connected to the anaerobic zone, and the main pipe is connected to the clean water zone; a water inlet 1 is provided at the top of one end on the upstream side near the filtration and collection zone, which is used to input the calcified granular sludge captured in the filtration and collection zone into the decalcification zone.

8. The integrated micro-power circulation sewage treatment device according to claim 7 is characterized in that: A vertical aeration pipe 2 is provided on each side wall of the decalcification zone, and the aeration pipe 2 is connected to an external aeration fan to provide pneumatic stirring for the decalcification zone; A vertical drug inlet pipe is provided in the center of the decalcification area, and through holes are evenly distributed on both sides of the drug inlet pipe. The drug inlet pipe is connected to the external decalcification agent storage tank through a drug delivery pipe; the clean water area is connected to the decalcification area through a backwash pipe to provide flushing water for the decalcification area.

9. The integrated micro-power circulation sewage treatment device according to claim 8, characterized in that: A second culture zone is provided between the anaerobic zone and the partition plate. A second openable and closable partition net is provided at the bottom of the second culture zone. The bottom of the first culture zone is connected to the second culture zone through a pipeline.

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