A kind of oxidation ditch vertical return sewage treatment device and sewage treatment method

Abstract

The present invention relates to the technical field of sewage treatment equipment, and specifically to an oxidation ditch vertical return sewage treatment device and a sewage treatment method, including a treatment pool and an inlet pipe, wherein the treatment pool includes area three, area one and area two, the area three is arranged below the treatment pool, the area one is arranged above the area three, and the area two is wrapped outside the area three and area one; the inlet pipe is connected with area three, the area three is connected with area one, and the area two is connected with area three; a lifting mechanism is arranged in the area one, and the sewage in the area one enters the area two through the lifting mechanism, a sedimentation area is arranged on the upper part of the treatment pool, the sedimentation area is connected with the area two, and an outlet pipe is arranged on the sedimentation area. The purpose is to make the water in the device produce a natural reflux state through the lifting mechanism, and after sedimentation in the sedimentation tank, the treated sewage is finally discharged in compliance with the standards.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment equipment, and in particular relates to an oxidation ditch vertical return sewage treatment device and a sewage treatment method. Background Art

[0002] The oxidation ditch is an activated sludge treatment system with a closed aeration tank. The entire process of oxidation ditch sewage treatment, such as water inlet, aeration, sedimentation, sludge stabilization and water outlet, is completed in the oxidation ditch.

[0003] In the existing treatment system, after the sewage passes through the anaerobic zone, the anoxic zone and the aerobic zone, it flows back from the aerobic zone to the anaerobic zone or the anoxic zone. It is necessary to add an additional power device so that the activated sludge flows back to the anaerobic zone or the anoxic zone to continue to play a role, thereby improving the efficiency of sewage treatment. However, the addition of an additional power device will increase the cost of the entire system, and the addition of an additional power device will also increase the volume and floor space of the entire system due to the limitation of the size of the device, which is not conducive to large-scale promotion and use. Summary of the invention

[0004] In order to solve the problem that an additional power device is needed when the sewage treatment system flows back from the aerobic zone to the anaerobic zone or the anoxic zone, the present invention proposes an oxidation ditch vertical return sewage treatment device and a sewage treatment method. The sewage treatment device is arranged vertically, and the water in the device is caused to produce a natural return state through a lifting mechanism, and is precipitated in a sedimentation tank so that the treated sewage is finally discharged in compliance with the standards.

[0005] The technical solution adopted by the present invention is: an oxidation ditch vertical return sewage treatment device, comprising a treatment pool and an inlet pipe, wherein the treatment pool is divided into area one and area two by a partition, the area two is wrapped outside the area one, and the bottoms of the area one and area two are connected; the area one is an anoxic area and the area two is an aerobic area, or the area one is an aerobic area and the area two is an anoxic area; the inlet pipe is arranged in the anoxic area, a lifting mechanism is arranged in the area one, and the sewage in the area one enters the area two from the top via the lifting mechanism; a sedimentation area is arranged on the top of the area two, the sedimentation area is connected with the area two, and an outlet pipe is arranged on the sedimentation area.

[0006] Preferably, the treatment pool is further provided with a zone three by a partition, the zone three is located below the zone one, the zone three is connected with the zone one and the zone two respectively, the zone three is an anaerobic zone, and the water inlet pipe is connected with the zone three.

[0007] Preferably, the area three and area one are separated by an isolation plate, and a through hole connecting area three and area one is provided on the isolation plate; the outer periphery of the isolation plate is connected to an adjustable annular plate, and the annular plate is located in area two, and the annular plate is separated from the inner wall of the treatment pool.

[0008] Preferably, the sewage in the area 2 is connected to the area 1 via the top of the isolation plate.

[0009] Preferably, the upper edge of the area one is lower than the upper edge of the sedimentation zone, the bottom of the sedimentation zone is connected to the area two, and the bottom of the sedimentation zone is inclined.

[0010] Preferably, an annular perforated pipe is arranged around the side wall of the sedimentation zone, and the holes on the annular perforated pipe are arranged downward toward the bottom of the sedimentation zone; a water collecting trough is arranged on the upper part of the sedimentation zone, and the water collecting trough is connected to the water outlet pipe.

[0011] Preferably, the lifting mechanism includes a paddle connected to a motor, and when the paddle rotates, the sewage in area one is transported upward.

[0012] Preferably, the water inlet pipe is connected to a perforated water distribution pipe, the perforated water distribution pipe is annular, and the perforated water distribution pipe is arranged at the bottom of area three; an aeration pipe is arranged in area two, and the aeration pipe is wound around the outer wall of area one.

[0013] A method for treating sewage with vertical return flow in an oxidation ditch. The sewage to be treated enters the anaerobic zone through an inlet pipe. The sewage in the anaerobic zone forms an upward-moving water flow through a lifting mechanism inside a treatment tank and enters the aerobic zone. The upward-moving water flow flows from the upper part of the aerobic zone into the anoxic zone due to its potential energy, circulates again and enters the aerobic zone and the anaerobic zone respectively.

[0014] Preferably, the anaerobic zone and the anoxic zone are separated by an isolation plate, on which a through hole connecting the anaerobic zone and the anoxic zone is provided, and the periphery of the isolation plate is connected to an annular plate for regulating the flow, so that the water flow ratio entering the aerobic zone and the anaerobic zone is 7:3-5:5.

[0015] The benefits of the present invention lie in that: by arranging a lifting mechanism in area one and continuously operating the lifting mechanism, the sewage in area one continuously moves upward, thereby flowing from the upper part of area one into area two, and finally forming a circulating water flow, thereby meeting the requirements for sewage treatment in the device. Area one and area two can be set as aerobic zones or anoxic zones according to actual use requirements; the sedimentation zone is set in area two, and the sedimentation zone is connected to area two, so that the sewage in area two can enter the sedimentation zone for sedimentation. The entire device is arranged vertically, which also reduces the footprint of the device, and the volume of the device can be expanded or reduced according to actual use requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the invention.

[0017] In the figure: 1-treatment tank, 2-water inlet pipe, 3-area three, 4-area one, 5-area two, 6-sedimentation area, 7-rotating shaft, 8-water collecting tank, 9-water outlet pipe, 10-aeration pipe, 11-sludge discharge pipe, 12-annular perforated pipe, 13-perforated water distribution pipe, 14-annular plate, 15-isolation plate, 16-paddle. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0019] Embodiment 1

[0020] like Figure 1 As shown, an oxidation ditch vertical return sewage treatment device comprises a treatment tank 1 and an inlet pipe 2, wherein the treatment tank 1 is divided into an area 1 4 and an area 2 5 by a partition, the area 2 5 is wrapped outside the area 1 4, and the bottoms of the area 1 4 and the area 2 5 are connected; the whole device is arranged vertically, when the area 1 4 is an aerobic zone, the area 2 5 is an anoxic zone, and the inlet pipe 2 is arranged in the anoxic zone; the sewage in the device enters the anoxic zone from the bottom of the treatment tank 1, and a lifting mechanism is arranged in the treatment tank 1, the lifting mechanism always keeps in operation, and during the operation, the sewage in the area 1 4 is continuously transported upward, so that the sewage overflows from the upper part of the area 1 4 into the area 2 5, and the sewage in the area 2 5 then flows into the area 1 4 from the bottom connection position, forming a circulating water flow.

[0021] A sedimentation zone 6 is arranged on the upper part of the area 2 5 , and the sedimentation zone 6 is connected with the area 2 5 . After the water in the area 2 5 enters the sedimentation zone 6 , it is precipitated in the sedimentation zone 6 , and the supernatant after precipitation flows out from the outlet pipe 9 and is discharged in compliance with the standards.

[0022] The treatment tank 1 is also provided with a zone three 3 by a partition, the zone three 3 is located below the zone one 4, the zone three 3 is connected with the zone one 4 and the zone two 5 respectively, the zone three 3 is an anaerobic zone, and the water inlet pipe 2 is connected with the zone three 3. The zone three 3 is located at the bottom of the treatment tank 1, and the water inlet pipe 2 directly passes the sewage into the bottom zone three 3 of the treatment tank 1. The sewage can pass through the anaerobic zone, the aerobic zone, and the anoxic zone in sequence, and then circulate from the anoxic zone to the anaerobic zone. There are three treatment modes from the anaerobic zone to the aerobic zone, from the anoxic zone directly to the aerobic zone, and from the anoxic zone through the anaerobic zone to the aerobic zone. Among them, the anaerobic zone to the aerobic zone and the anoxic zone directly to the aerobic zone are two independent AO treatment modes, thereby achieving more efficient nitrogen removal and phosphorus removal.

[0023] The area three 3 and the area one 4 are separated by an isolation plate 15, and the outer periphery of the isolation plate 15 is separated from the inner wall of the treatment tank 1 to form a channel through which water can flow, and the isolation plate 15 is provided with a through hole connecting the area three 3 and the area one 4, and the through hole can be set in the middle position of the isolation plate 15, or a plurality of through holes can be evenly distributed on the isolation plate 15; the outer periphery of the isolation plate 15 is connected to an adjustable annular plate 14, and the isolation plate 15 and the annular plate 14 can be connected together in a detachable manner, such as bolts, or snap-on, and the size of the annular plate 14 can also be selected according to actual usage requirements, so as to adjust the size of the channel entering the area three 3, and the annular plate 14 is located in the area two 5, and the annular plate 14 is separated from the inner wall of the treatment tank 1.

[0024] The upper edge of the area 1 4 is lower than the upper edge of the sedimentation area 6 , thereby ensuring that water overflowing from the area 1 4 directly enters the area 2 5 instead of entering the sedimentation area 6 .

[0025] The bottom of the sedimentation zone 6 is connected to the area 2 5 , and the bottom of the sedimentation zone is inclined. The sedimentation zone 6 is arranged on the side wall of the treatment tank 1 , and the bottom is inclined, which can ensure the sedimentation effect of the sedimentation zone 6 .

[0026] An annular perforated tube 12 is arranged around the side wall of the sedimentation zone 6, and a waterproof breathable membrane is arranged on the annular perforated tube 12. The material of the waterproof breathable membrane can be polytetrafluoroethylene. The holes on the annular perforated tube 12 are arranged downward toward the bottom of the sedimentation zone 6. When a lot of sludge is accumulated at the bottom of the sedimentation zone 6, gas can be introduced into the annular perforated tube 12, so that the annular perforated tube 12 sprays pressurized gas outward, thereby blowing out the sludge at the bottom of the sedimentation zone 6 for cleaning; a water collecting trough 8 is arranged on the upper part of the sedimentation zone 6, and the water collecting trough 8 is connected to the outlet pipe 9. The water collecting trough 8 can collect the supernatant in the sedimentation zone 6, and the supernatant is then discharged through the outlet pipe 9.

[0027] The lifting mechanism includes a paddle 16, which is connected to the motor through a rotating shaft 7. When the paddle 16 rotates, the sewage in area 1 4 is transported upward. The paddle 16 rotates continuously, and the sewage in area 1 4 can be continuously transported upward, and finally the sewage passes over the upper edge of area 1 4 and enters area 2 5.

[0028] The water inlet pipe 2 is connected to a perforated water distribution pipe 13, which is annular and arranged at the bottom of the area 3. An aeration pipe 10 is arranged in the aerobic zone to continuously provide the required oxygen for the aerobic zone.

[0029] An overflow pipe is arranged at the upper part of the sedimentation area 6, and a mud discharge pipe 11 is arranged at the bottom, so as to ensure that the excess water in the sedimentation area 6 can be discharged smoothly without overflowing.

[0030] Embodiment 2

[0031] A method for treating vertical return sewage in an oxidation ditch, wherein the sewage to be treated enters the anaerobic zone through an inlet pipe 2, and the sewage in the anaerobic zone forms an upwardly moving water flow through a lifting mechanism inside a treatment tank 1, and enters the anoxic zone; the upwardly moving water flow flows from the upper part of the anoxic zone into the aerobic zone due to its potential energy, circulates again from the aerobic zone, and enters the aerobic zone and the anaerobic zone respectively at the same time, that is, since the lifting mechanism continuously takes away the sewage, it is necessary to continuously replenish the sewage from the aerobic zone to enter the anoxic zone, a part of the sewage in the aerobic zone directly enters the anoxic zone, a part enters the anaerobic zone, and then continues to flow from the anaerobic zone to the anoxic zone, and the water flow ratio from the aerobic zone to the anoxic zone and the anaerobic zone is 7-5:3-5, and the flow ratio can be adjusted by adjusting the annular plate 14, that is, the water flow ratio from the aerobic zone to the anoxic zone and the anaerobic zone is in the range of 7:3-5:5.

[0032] The present invention can realize two independent AO treatment modes from the anaerobic zone to the aerobic zone and from the anoxic zone directly to the aerobic zone, thereby realizing more efficient nitrogen removal and phosphorus removal. See Table 1, which shows the treatment results of sewage treated by the device of the present invention and the comparative example.

[0033] The following is a comparison of the sewage treatment results of the traditional AA0 treatment process with the same influent (100m³ / day), the same volume (same retention time 15h), and the same influent quality. The sewage passes through the anaerobic zone, aerobic zone, and anoxic zone in sequence, and finally circulates into the anaerobic zone:

[0034]

[0035] It can be seen from the above data that under the same water inflow (100m³ / day), the same volume, and the same inflow water quality, the treatment device and the treatment process of the present invention are better than the traditional process in treatment effect; if the water inflow (100m³ / day), the same inflow water quality, the energy consumption and the same treatment effect are the same, the treatment capacity of the present invention is larger (the total residence time is shorter).

[0036] Specific working method: Take area 1 4 as the anoxic zone, area 2 5 as the aerobic zone, and area 3 3 as the anaerobic zone as an example for explanation. The sewage enters directly from the water inlet pipe 2 and directly passes into the bottom of the treatment tank 1. The sewage continues to rise and enters area 1 4. Under the movement of the lifting mechanism, the sewage forms an upward movement state inside. The lifting mechanism continuously lifts the sewage in area 1 4, so that the sewage flows out from the upper edge of area 1 4 and enters area 2 5. Since the sewage in area 1 4 is lifted upward, the sewage in area 2 5 is replenished from the bottom of the treatment tank 1, so that the sewage in area 2 5 enters area 3 3 and area 1 4 again, thereby forming a circulating water flow.

[0037] Since area 2 5 is connected to the sedimentation area 6 , water continuously enters the sedimentation area 6 and is precipitated in the sedimentation area 6 . The supernatant after precipitation enters the water collection tank 8 and is discharged through the outlet pipe 9 in compliance with the standards.

[0038] The size of the entire device of the present invention can be set according to actual use requirements, and can be used for household sewage treatment or industrial sewage treatment. It has a wide range of applications, and the device is simple, the processing cost is low, and it is easy to popularize.

[0039] The above embodiments are preferred embodiments. It should be noted that the above preferred embodiments should not be regarded as limiting the invention, and the protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An oxidation ditch vertical return sewage treatment device, comprising a treatment tank (1) and a water inlet pipe (2), characterized in that: The treatment pool (1) is divided into a zone 1 (4) and a zone 2 (5) by a partition, the zone 2 (5) is wrapped outside the zone 1 (4), and the bottoms of the zone 1 (4) and the zone 2 (5) are connected; the zone 1 (4) is an anoxic zone and the zone 2 (5) is an aerobic zone, or the zone 1 (4) is an aerobic zone and the zone 2 (5) is an anoxic zone; the water inlet pipe (2) is arranged in the anoxic zone, a lifting mechanism is arranged in the zone 1 (4), and the sewage in the zone 1 (4) enters the zone 2 (5) from the top through the lifting mechanism; a sedimentation zone (6) is arranged on the top of the zone 2 (5), the sedimentation zone (6) is connected to the zone 2 (5), and a water outlet pipe (9) is arranged on the sedimentation zone (6); the upper edge of the zone 1 (4) is lower than the lower edge of the zone 1 (4); At the upper edge of the sedimentation zone (6), the bottom of the sedimentation zone (6) is connected to the zone two (5), and the bottom of the sedimentation zone is inclined; the treatment pool (1) is also provided with a zone three (3) by a partition, the zone three (3) is located below the zone one (4), the zone three (3) is connected to the zone one (4) and the zone two (5) respectively, the zone three (3) is an anaerobic zone, and the water inlet pipe (2) is connected to the zone three (3); the anaerobic zone and the anoxic zone are separated by an isolation plate (15), the isolation plate (15) is provided with a through hole connecting the anaerobic zone and the anoxic zone, and the outer periphery of the isolation plate (15) is connected to a ring plate (14) for adjusting the flow rate, so that the water flow rate ratio entering the aerobic zone and the anaerobic zone is 7:3-5:

5.

2. The oxidation ditch vertical return sewage treatment device according to claim 1 is characterized in that: The area three (3) and the area one (4) are separated by an isolation plate (15), and a through hole is provided on the isolation plate (15) for connecting the area three (3) and the area one (4); the outer periphery of the isolation plate (15) is connected to an adjustable annular plate (14), and the annular plate (14) is located in the area two (5), and the annular plate (14) is separated from the inner wall of the treatment pool (1).

3. The oxidation ditch vertical return sewage treatment device according to claim 2 is characterized in that: The sewage in the area two (5) is connected to the area one (4) via the top of the isolation plate (15).

4. The oxidation ditch vertical return sewage treatment device according to claim 3 is characterized by: An annular perforated pipe (12) is arranged around the side wall of the sedimentation area (6), and the holes on the annular perforated pipe (12) are arranged downward toward the bottom of the sedimentation area (6); a water collecting trough (8) is arranged on the upper part of the sedimentation area (6), and the water collecting trough (8) is connected to the water outlet pipe (9).

5. The oxidation ditch vertical return sewage treatment device according to any one of claims 1 to 4, characterized in that: The lifting mechanism comprises a paddle (16), wherein the paddle (16) is connected to a motor, and when the paddle (16) rotates, the sewage in area one (4) is transported upward.

6. The oxidation ditch vertical return sewage treatment device according to claim 5 is characterized by: The water inlet pipe (2) is in communication with a perforated water distribution pipe (13), the perforated water distribution pipe (13) is annular, and the perforated water distribution pipe (13) is arranged at the bottom of the third area (3); an aeration pipe (10) is arranged in the second area (5), and the aeration pipe (10) is wound around the outer wall of the first area (4).

7. A method for treating vertical return wastewater in an oxidation ditch, characterized in that: An oxidation ditch vertical return sewage treatment device applied to any one of claims 1 to 6, wherein the sewage to be treated enters the anaerobic zone via the water inlet pipe (2), the sewage in the anaerobic zone forms an upwardly moving water flow through the lifting mechanism inside the treatment tank (1), and enters the aerobic zone; the upwardly moving water flow flows from the upper part of the aerobic zone into the anoxic zone due to its potential energy, circulates again and enters the aerobic zone and the anaerobic zone respectively.

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