Three-phase separation device and sewage treatment system

Abstract

The utility model discloses a three-phase separation device and a sewage treatment system. The three-phase separation device comprises an overflow weir for receiving sewage in a reactor, a screening unit is further arranged on the side, close to the overflow weir, of the top of the reactor and comprises a rotary screen located between the overflow weir and the reactor and a cleaning element located on the side, facing the reactor, of the rotary screen and used for cleaning the rotary screen. A sewage receiving container is arranged on the side, away from the rotary screen, of the overflow weir, and a power unit used for driving the rotary screen to move can be further arranged in the sewage receiving container in an integrated mode. The power unit can fully utilize kinetic energy of sewage after gravity acting to drive the rotary screen to rotate, solid-liquid separation is achieved based on the interception screening effect of the rotary screen, gas-solid separation of sludge and bubbles is achieved based on rotation of the rotary screen, and the efficient and stable three-phase separation effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewage treatment technical field especially, relates to a three -phase separation device and sewage treatment system. BACKGROUND

[0002] In the water treatment engineering of environmental protection industry, three -phase separator is a commonly used structure, its form is various, core function is with the gas, water, mud three -phase separation of the effluent of biochemical reactor, makes gas exhaust, particulate sludge falls back to the reaction zone, simultaneously sewage normal flow. Three -phase separator is widely used in water treatment engineering, not only be applied to high -efficient anaerobic reactor (UASB, EGSB, IC etc.), also be applied to high -efficient denitrification reactor (denitrification granular sludge fluidized bed), in recent years, also be applied in short -path nitrification and denitrification, anaerobic ammonia oxidation and aerobic granular sludge reactor.

[0003] But the existing three -phase separator generally has the following problems: 1, when a large number of particulate sludge float, will exceed the processing load of three -phase separator, causes three -phase separator to be blocked and thus loses three -phase separation function;2, the sludge with gas bubble float can only be passive degassing, and the sludge with gas bubble floats in three -phase separator and degasses automatically under a certain probability, and the degassing capacity is poor and slow;3, the existing three -phase separator occupies the cross -section area of the sewage treated, improves the flow velocity, and is not conducive to the natural sedimentation of particulate sludge;4, the existing three -phase separator occupies the longitudinal height inside the reactor, and reduces the space utilization rate of the reactor.

[0004] In view of the above problems, the technical personnel in the prior art are necessary to provide a three -phase separation device and sewage treatment system with excellent and stable separation effect. SUMMARY

[0005] To solve the above problems, the utility model aims at providing a three -phase separation device and sewage treatment system with excellent and stable three -phase separation effect of mud, water and gas.

[0006] To achieve the above purpose, the technical scheme adopted is as follows:

[0007] A three -phase separation device, the device includes the overflow weir for flowing sewage arranged close to the sewage source, the sieve unit is further arranged between the overflow weir and the sewage source, the sieve unit includes the rotating screen close to the overflow weir, the rotating screen is connected with the power unit, the power unit drives the rotating screen partially overhanging in the sewage source to rotate, realizes the interception of gas -solid phase and the separation of liquid phase, and makes the separated liquid phase flow out through the overflow weir.

[0008] Preferably, the rotating screen is arranged on the screen shaft and rotates synchronously with the screen shaft; the power unit comprises a water wheel shaft and a water wheel arranged on the water wheel shaft and rotating synchronously with the water wheel shaft, and the screen shaft is connected with the water wheel shaft through a transmission belt to realize synchronous rotation of the rotating screen and the water wheel.

[0009] Further, the screen shaft is higher than the water outlet of the overflow weir, and the water wheel is located below the overflow weir.

[0010] Further, the highest part of the blade of the water wheel is more than 50 mm away from the lowest part of the overflow weir.

[0011] Preferably, a sewage receiving container is arranged on the side of the overflow weir away from the rotating screen; the screen shaft is fixed on the sewage receiving container, and the water wheel shaft is fixed in the sewage receiving container.

[0012] Preferably, the overflow weir is in the projection of the rotating screen in the vertical direction and is parallel to the rotating screen; and the projection of the rotating screen on the plane of the overflow weir completely covers the water outlet of the overflow weir.

[0013] Further, a cleaning element for cleaning the rotating screen is arranged on the side of the rotating screen away from the overflow weir, the cleaning element extends along the radius of the rotating screen and is fixed through a support rod.

[0014] Further, the length of the cleaning element is greater than the radius of the rotating screen, so as to sufficiently clean the rotating screen during rotation of the rotating screen.

[0015] Preferably, the angle between the rotating screen and the horizontal plane is 75°-90°.

[0016] Preferably, the material of the rotating screen is metal or non-metal or a combination of metal and non-metal; and the aperture of the rotating screen is 0.01 mm to 20 mm.

[0017] Preferably, the single-piece surface of the blade of the water wheel is greater than 0.002 m2, and the number of blades is greater than 2.

[0018] To achieve another object of the present application, a sewage treatment system is provided, which comprises the three-phase separation device and a reactor, and the overflow weir of the three-phase separation device is arranged close to the top of the reactor to receive the sewage source of the reactor.

[0019] Advantages:

[0020] 1) The utility model discloses a rotating screen is used as the physical barrier between sewage source and overflow weir, makes the granular sludge that sticks with bubble be intercepted by rotating screen before sewage passes through overflow weir, and under the rotation of rotating screen, produces the rolling, and under the water flow propelling action, produces multiple collisions with rotating screen, makes granular sludge and bubble separate, and granular sludge sinks under the gravity, and then, sewage flows out from overflow weir after rotating screen, and bubble separates with granular sludge and floats into air or gas collecting hood, thereby, realizes solid-liquid separation based on the intercepting and screening effect of rotating screen, realizes gas-solid separation of sludge and bubble based on the rotation of rotating screen, and the granular sludge with bubble above certain size is intercepted and washed by sewage, and the granular sludge and the bubble that stick with it are forced to separate rapidly, and three-phase separation effect is realized rapidly, and the efficiency is high and does not block.

[0021] 2) The utility model discloses a power unit can make full use of the kinetic energy of sewage after gravity work and drive the rotation of rotating screen, specifically, sewage flows out from overflow weir after rotating screen, and the gravitational potential energy is converted into kinetic energy after free fall, and then, the sewage obtains certain downward movement speed, and then, the sewage that moves downward impacts the blade of water wheel, and the blade of water wheel rotates, and the rotating screen connected with water wheel through transmission belt also obtains kinetic energy, and rotating screen overcomes the resistance of sewage and the friction of cleaning element and keeps rotating, not only can directly screen and intercept granular sludge, but also can directly collide and interfere with granular sludge that sticks with bubble, and the sludge is degassed, and obtains certain centrifugal speed and leaves screen area and settles down by itself, and the effect of three-phase separation of mud, water and gas is achieved. The cleaning element such as cleaning brush can brush the surface of screen during rotation, and the screen is prevented from blocking. Thus, the utility model can directly utilize water power and does not need to provide additional power to achieve efficient and stable three-phase separation effect.

[0022] 3) The three-phase separation device in the utility model does not occupy the cross-sectional area of internal sewage rising channel of reactor, is favorable to maintaining good rising flow rate and flow state, does not occupy the longitudinal height of reactor, and improves the volume utilization efficiency of reactor.

[0023] 4) The utility model has self-cleaning function under the premise of no additional power and does not destroy the structure of granular sludge. And its application range is wide, and is suitable for three-phase separation scene of biochemical granular sludge reactor such as anaerobic, facultative anaerobic, denitrification, aerobic and anaerobic ammonia oxidation. BRIEF DESCRIPTION OF DRAWINGS

[0024] The utility model will be further explained in connection with the drawings.

[0025] Figure 1 It is the front view of three-phase separation device / sewage treatment system of the utility model.

[0026] Figure 2 It is the side view of three-phase separation device / sewage treatment system of the utility model.

[0027] Figure 3 Figure 1 is a schematic diagram of a power unit according to the present application.

[0028] BRIEF DESCRIPTION OF DRAWINGS

[0029] 100 - screening unit, 110 - rotating screen, 120 - screen shaft, 130 - cleaning element, 140 - support rod; 200 - overflow weir, 201 - water outlet weir; 300 - power unit, 310 - water wheel, 320 - water wheel shaft, 330 - transmission belt; 400 - reactor; 500 - sewage receiving container, 510 - water outlet. DETAILED DESCRIPTION

[0030] The present application will be further explained in detail below in conjunction with the description of the drawings and specific embodiments.

[0031] According to a preferred embodiment of the present application, as shown in Figure 1 Figure 1, it is a three-phase separation device, which comprises an overflow weir 200, the overflow weir 200 is arranged adjacent to the top of the reactor 400, for receiving the sewage of the reactor; the overflow weir 200 and the sewage source at the top of the reactor 400 are further provided with a screening unit 100, the screening unit 100 comprises a rotating screen 110 close to the overflow weir 200, the rotating screen 110 is connected with a power unit 300, the power unit 300 drives part of the rotating screen 110 suspended in the sewage source to rotate, realizes the interception of gas-solid phase and the separation of liquid phase, and makes the separated liquid phase flow out through the overflow weir 200.

[0032] Based on the structural arrangement of the present embodiment, the granular sludge with bubbles floats to the top of the reactor 400 under the buoyancy of the bubbles, and moves towards the overflow weir 200 with the effluent, the rotating screen 110 is close to the overflow weir 200 and also close to the side wall of the reactor 400, and the bottom part of the rotating screen 110 is suspended in the sewage of the reactor 400, so that the rotating screen 110 acts as a physical barrier between the sewage source of the reactor 400 and the overflow weir 200, and then the granular sludge with bubbles is intercepted by the rotating screen 110 before the sewage passes through the overflow weir 200, and rolls under the rotating action of the rotating screen 110 (based on the rotating power provided by the power unit), and collides with the rotating screen 110 multiple times under the pushing action of the water flow, so that the granular sludge and the bubbles are separated, the granular sludge sinks under the action of gravity, and the sewage flows out from the overflow weir 200 after passing through the rotating screen 110, the bubbles separate from the granular sludge and float into the air or the gas collecting hood, thereby realizing three-phase separation.

[0033] As a preferred embodiment, in conjunction with Figure 2As shown, the rotating screen 110 is sleeved on the screen shaft 120 and rotates synchronously with the screen shaft 120; the power unit 330 can adopt a water wheel transmission mechanism, specifically: including a water wheel shaft 320, and a water wheel 310 sleeved on the water wheel shaft 320 and rotating synchronously with the water wheel shaft 320, the water wheel shaft 320 is in transmission connection with the screen shaft 120 through the transmission belt 330. Thus, the synchronous rotation of the rotating screen 110 and the water wheel 310 can be realized through the transmission belt 330. Based on the embodiment, combined with Figure 3 As shown, the sewage flowing out of the overflow weir 200 in the water outlet direction P obtains a certain speed after gravity work, and then hits the water wheel 310 to transfer its kinetic energy to the water wheel 310, so that the water wheel 310 blades drive the water wheel shaft 320 to rotate (such as the rotation direction R1 in Figure 3 The rotating screen 110 is continuously rotated around the screen shaft 120 (such as the rotation direction R2 in Figure 3 Based on the above-mentioned water wheel transmission mechanism, stable three-phase separation can be completed without external power.

[0034] In order to realize the stable operation of the water wheel transmission mechanism, the screen shaft 120 is higher than the water outlet weir of the overflow weir 200, and the water wheel 310 is located below the overflow weir 200. More preferably, the highest part of the blades of the water wheel 310 is more than 50 mm away from the lowest part of the overflow weir, and more preferably the distance between the two is controlled to be between 300-2000 mm. In addition, the single piece area of the blades of the water wheel is greater than 0.002㎡, and the number of blades should be greater than 2, such as Figure 1 Or 3, as shown, the number of blades is 6, and the shape of the blades is not limited. Thus, the stable rotation of the water wheel 310 blades is ensured, and stable power is provided for the rotating screen 110.

[0035] In addition, the transmission belt 330 and the water wheel shaft 320, the screen shaft 120 and the like can also be replaced by other forms of transmission structure such as gear transmission shaft, and the structure with similar transmission function is also within the protection scope of the patent.

[0036] The sewage receiving container 500 is arranged on the side of the overflow weir 200 away from the rotating screen 110. Based on the optimization of the overall layout, the water wheel shaft 320 can be fixed in the sewage treatment container 500, so that the water wheel 310 receives power from the sewage of the overflow weir 200. In addition, the screen shaft 120 can be fixed on the sewage receiving container 500. The sewage flowing out of the overflow weir 200 flows into the sewage receiving container 500, the reactor 400 has a water inlet 410 at the bottom, and the sewage receiving container 500 has a water outlet 510 at the bottom.

[0037] In order to realize long-period stable operation of the device, the rotary screen 110 is provided with a cleaning element 130 for cleaning the rotary screen 110 on the side away from the overflow weir 200, the cleaning element 130 extends along the radius of the rotary screen 110 and is fixedly arranged through a support rod 140, and the length of the cleaning element 130 is greater than the radius of the rotary screen 110. At this time, the rotary screen 110 is matched with the fixed cleaning element 130, and when the rotary screen 110 rotates, the rotary screen 110 and the cleaning element 130 are relatively rubbed to realize the treatment of the sludge on the surface of the screen, and the rotary screen 110 is completely cleaned. In addition, the cleaning element 130 generally adopts a cleaning brush, which can be conveniently disassembled and replaced.

[0038] Based on this, when the rotary screen 110 rotates, the cleaning element 130 is fixedly arranged and does not rotate with the rotary screen 110, the cleaning element 130 is in contact with the surface of the rotary screen 110 to clean the sludge and other solids on the surface of the screen in time, so that the rotary screen 110 maintains good permeability and is not blocked.

[0039] The overflow weir 200 is in the projection of the rotary screen 110 in the vertical direction and is parallel to the circular surface of the rotary screen 110, and the projection of the rotary screen 110 on the plane of the overflow weir 200 completely covers the water outlet weir 201 of the overflow weir 200. Generally, the rotary screen 110 is circular, and the overflow weir 200 is in the projection of the circular surface of the rotary screen 110 in the vertical direction and is parallel to the circular surface of the rotary screen 110.

[0040] In actual application, the included angle between the rotary screen 110 and the horizontal plane is between 0° and 90°, and is preferably 75°-90°. The material of the rotary screen 110 is metal or non-metal or a combination of metal and non-metal. According to the application requirement, the diameter of the rotary screen 110 is greater than 0.1 m, and is between 0.6-2.0 m. The pore size of the rotary screen 110 is 0.01 mm to 20 mm, and is preferably 0.4 mm to 2.0 mm. The hole shape is generally but not limited to rectangular, circular.

[0041] According to another embodiment of the utility model, a sewage treatment system comprises a reactor and the three-phase separation device, the overflow weir 200 of the three-phase separation device is arranged close to the top of the reactor 400, and is used for receiving the sewage source of the reactor. The reactor 400 adopts a granular sludge reactor.

[0042] Based on the above embodiment, the following application effects can be achieved: the granular sludge with bubbles is floated to the top of the granular sludge reactor under the buoyancy of the bubbles, moves towards the overflow weir 200 with the effluent, is intercepted by the rotating screen 110 before passing through the overflow weir 200, and rolls under the rotation of the rotating screen 110 and collides with the rotating screen 110 multiple times under the pushing action of the water flow, so that the granular sludge is separated from the bubbles, the granular sludge sinks under the action of gravity, the sewage flows out from the overflow weir 200 after passing through the rotating screen 110, and the bubbles float into the air or the gas collecting hood (not shown in the figure) after being separated from the granular sludge, realizing three-phase separation.

[0043] The sewage flowing out from the overflow weir 200 obtains a certain speed after gravity work, and the kinetic energy is transmitted to the water wheel 310 by impacting the water wheel 310, so that the water wheel 310 rotates around the water wheel shaft 320, and the rotating screen 110 is continuously rotated around the screen shaft 120 through the transmission belt 330, and the cleaning element 130 does not rotate with the screen during the rotation of the rotating screen 110, and cleans the sludge and other solids on the surface of the screen in time through contact with the surface of the screen, so that the screen maintains good passability and is not blocked. Therefore, without additional power, stable three-phase separation can be achieved.

[0044] Implementation Case 1: Three-phase separation of denitrifying granular sludge reactor

[0045] The inflow and outflow of the denitrifying granular sludge reactor is 8.5m 3 h, the angle between the rotating screen 110 and the horizontal plane is 90°, the area of the overflow weir 200 is 0.03㎡, the diameter of the rotating screen 110 is 1.2m, the pore size of the rotating screen 110 is 1.4mm, the height difference between the overflow weir 200 and the water wheel shaft 320 is 0.8m, the water wheel blades are rectangular, the single piece area is 0.04㎡, and the number of water wheel blades is 4.

[0046] Implementation Case 2: Three-phase separation of aerobic granular sludge reactor

[0047] The outflow of the aerobic granular sludge reactor is 20m 3 h, the angle between the rotating screen 110 and the horizontal plane is 75°, the area of the overflow weir 200 is 0.06㎡, the diameter of the rotating screen 110 is 1.5m, the pore size of the rotating screen 110 is 1.1mm, the height difference between the overflow weir 200 and the water wheel shaft 320 is 1.0m, the water wheel blades are rectangular, the single piece area is 0.06㎡, and the number of water wheel blades is 6.

[0048] Through the implementation of examples 1-2, good three-phase separation effect is achieved.

[0049] The above examples are only used to further detail the technical solutions of the present application and cannot be understood as limiting the protection scope of the present application. Some non-essential improvements and adjustments made by the skilled in the art according to the above content of the present application all belong to the protection scope of the present application.

Claims

1. A three-phase separation apparatus, characterized by: The device comprises an overflow weir arranged close to a sewage source for flowing sewage; a screening unit is further arranged between the overflow weir and the sewage source, the screening unit comprises a rotating screen mesh close to the overflow weir, the rotating screen mesh is connected with a power unit, the power unit drives the rotating screen mesh to rotate in the sewage source, realizes interception of gas-solid phase and separation of liquid phase, and makes the separated liquid phase flow out through the overflow weir.

2. The three-phase separation apparatus of claim 1, wherein: The rotating screen mesh is sleeved on the screen mesh shaft and rotates synchronously with the screen mesh shaft; the power unit comprises a water wheel shaft and a water wheel sleeved on the water wheel shaft and rotating synchronously with the water wheel shaft, the screen mesh shaft is drivingly connected with the water wheel shaft through a transmission belt, realizing synchronous rotation of the rotating screen mesh and the water wheel.

3. The three-phase separation apparatus of claim 2, wherein: The screen mesh shaft is higher than a water outlet weir of the overflow weir, and the water wheel is located below the overflow weir.

4. The three-phase separation apparatus of claim 3, wherein: The highest part of the blade of the water wheel is more than 50 mm away from the lowest part of the overflow weir.

5. The three-phase separation apparatus of claim 2, wherein: A sewage receiving container is arranged on the side of the overflow weir away from the rotating screen mesh; the screen mesh shaft is fixed on the sewage receiving container, and the water wheel shaft is fixed in the sewage receiving container.

6. The three-phase separation apparatus of claim 1, wherein: The overflow weir is in the projection of the rotating screen mesh in the vertical direction and parallel to the rotating screen mesh; and the projection of the rotating screen mesh on the plane of the overflow weir completely covers the water outlet weir of the overflow weir.

7. The three-phase separation apparatus of claim 1, wherein: A cleaning element for cleaning the rotating screen mesh is arranged on the side of the rotating screen mesh away from the overflow weir, the cleaning element extends along the radius of the rotating screen mesh and is fixedly arranged through a support rod.

8. The three-phase separation apparatus of claim 1, wherein: The angle between the rotating screen mesh and the horizontal plane is 75°-90°.

9. The three-phase separation apparatus of claim 1, wherein: The rotating screen mesh is made of metal or non-metal or a combination of metal and non-metal; the pore size of the rotating screen mesh is 0.01 mm to 20 mm.

10. A sewage treatment system characterised in that, A reactor comprising the three-phase separation device of any one of claims 1-9, the overflow weir of the three-phase separation device is arranged close to the top of the reactor for receiving the sewage source of the reactor.

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