Flocculation sedimentation device and method for sewage treatment

Abstract

The present invention discloses a flocculation sedimentation device and method for sewage treatment, and relates to the technical field of sewage treatment, wherein the flocculation sedimentation device for sewage treatment includes a reactor with a stirring chamber, a stirring shaft is rotatably arranged in the stirring chamber, a stirring plate is arranged on the side wall of the stirring shaft, the stirring plate includes a fixed part and a movable part, the fixed part and the movable part are assembled to form a stirring surface, and the movable part is adapted to be able to be received in the fixed part, so as to change the size of the stirring surface. The size of the stirring surface is adjustable by receiving the movable part in the fixed part. Compared with the prior art, the stirring plate of the present invention is composed of a fixed part and a movable part, and the size of the stirring surface is adjustable so that the contact area between the stirring plate and the flocculent body is adjustable, so that the flocculent body is not easily sheared and disintegrated.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a flocculation sedimentation device and method for sewage treatment. Background Art

[0002] Sewage treatment flocculants are a kind of water-soluble high molecular polymers with negative, neutral, and positive charges on their molecular chains, as well as strong adsorption genes. They can adsorb, bridge, and charge neutralize colloids or suspended particles in water, destroy the stability of colloids or particles, and promote their flocculation to form larger floccules, thereby improving or accelerating the solid-liquid separation process. Therefore, it is widely used in the treatment of raw water, wastewater, sludge, etc. in various industries.

[0003] At present, a Chinese patent with announcement number CN213506132U discloses a flocculation and sedimentation device for sewage treatment, including a reactor body, a stirring rod that can rotate driven by a stirring motor in the reactor body, and a plurality of stirring rods are arranged on the side wall of the stirring rod. During flocculation treatment, flocculant is added to the sewage in the reactor body, and the sewage and flocculant are fully stirred by the stirring rod until the impurities in the sewage flocculate and settle. However, it is found in actual operation that stirring intensity is the key to flocculation quality. Appropriate stirring intensity can increase the flocculation rate of sewage, but excessive stirring intensity will cause the floccules to disintegrate, affecting the effect of sewage treatment.

[0004] The stirring intensity depends on the stirring speed and the stirring area. In the prior art, the stirring intensity is often controlled by adjusting the stirring speed. However, when the stirring area remains unchanged, for example, the stirring rod is prone to shearing the flocs, and the flocs still disintegrate. Summary of the invention

[0005] The first object of the present invention is to overcome the deficiencies of the prior art and provide a flocculation and sedimentation device for sewage treatment.

[0006] The first object of the present invention is achieved by the following technical solutions:

[0007] A flocculation and sedimentation device for sewage treatment comprises a reactor with a stirring chamber, wherein a stirring shaft is rotatably arranged in the stirring chamber, a stirring plate is arranged on the side wall of the stirring shaft, the stirring plate comprises a fixed part and a movable part, the fixed part and the movable part are assembled to form a stirring surface, and the movable part is adapted to be retractable into the fixed part, thereby changing the size of the stirring surface.

[0008] Preferably, a sliding cavity is configured on the fixed portion, and the movable portion is movably adapted to the sliding cavity.

[0009] Preferably, an ejection mechanism is provided in the sliding cavity, and an execution end of the ejection mechanism is connected to the movable part.

[0010] Preferably, a via hole is formed through the fixed portion, and the movable portion is adapted to cover the via hole to different degrees.

[0011] Preferably, a mounting frame is provided on the side wall of the stirring shaft, the fixing portion is movably adapted in the mounting frame along the tangential direction, and the movable portion is adapted to further open the through hole as the fixing portion is elastically adapted to be pressed.

[0012] Preferably, the movable portion comprises a connecting rod and a baffle plate arranged on the connecting rod, and the connecting rod is adapted to be able to move in the axial direction, so as to change the covering area of ​​the through hole by the baffle plate.

[0013] Preferably, the stirring chamber includes a clear liquid zone, a mixing zone and a sedimentation zone from top to bottom, and at least one stirring plate is provided in each of the clear liquid zone, the mixing zone and the sedimentation zone. A detection member is provided on the mounting frame in the clear liquid zone and the sedimentation zone, and the detection member can detect the elastic position of the fixed part. The flocculation sedimentation device also includes a controller and a dosing mechanism. The controller is electrically connected to the detection member, and the controller is configured and designed so that the flocculation sedimentation device has at least the following usage modes: shutdown mode: the fixed part in the clear liquid zone is reset to a natural position, and the corresponding detection member transmits an electrical signal to the controller, at which time the controller controls the stirring shaft to stop rotating; dosing mode: the fixed part in the sedimentation zone undergoes a reset stroke, and the corresponding detection member transmits an electrical signal to the controller, at which time the controller controls the dosing mechanism to dosing; wherein, in the dosing mode, the fixed part in the clear liquid zone is in a compressed elastic state.

[0014] Preferably, a driving inclined surface is provided on the inner side wall of the installation frame, and a driving spring is connected to the connecting rod, and the driving spring is used to push the connecting rod to abut against the driving inclined surface.

[0015] Preferably, the flocculation sedimentation device also includes a dosing mechanism, which includes a liquid storage bag arranged on the fixed part in the clear liquid area, the liquid storage bag is provided with a liquid outlet, a pressure valve is provided in the liquid outlet, and an extrusion rod is provided on the fixed part in the sedimentation area, and the extrusion rod extends to be aligned with the liquid storage bag.

[0016] The second object of the present invention is to overcome the deficiencies of the prior art and provide a flocculation and sedimentation method for sewage treatment.

[0017] The second object of the present invention is achieved through the following technical solutions:

[0018] A flocculation and sedimentation method for sewage treatment, comprising the above-mentioned flocculation and sedimentation device, comprises the following steps:

[0019] S1, introducing the sewage to be treated into the stirring chamber (1) and adding a flocculant;

[0020] S2, driving the stirring shaft (3) to rotate so that the stirring plate (4) stirs the sewage and the flocculant;

[0021] Wherein, in S2, when the stirring force needs to be reduced, the movable part (6) can be driven to retract into the fixed part (5), thereby reducing the area of ​​the stirring surface.

[0022] The beneficial effects of the present invention are:

[0023] 1. The size of the stirring surface is adjustable by putting the movable part into the fixed part. Compared with the prior art, the stirring plate of the present invention is composed of a fixed part and a movable part, and the size of the stirring surface is adjustable so that the contact area between the stirring plate and the flocculent is adjustable, thereby preventing the flocculent from being sheared and disintegrated.

[0024] 2. The combination of the movable part and the through hole enables the floccules to pass through the through hole, and the floccules are less likely to be sheared and disintegrated.

[0025] 3. Through the coordination of the fixing part, the detection part and the controller, the present invention has a shutdown mode and a dosing mode. The former can realize the automatic shutdown of the stirring shaft without excessive stirring; the latter can realize the automatic dosing of the dosing mechanism into the stirring chamber, thereby achieving the best sewage flocculation and sedimentation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the structure of the sliding cavity;

[0027] Figure 2 is a schematic diagram of the structure of the via;

[0028] Figure 3 for Figure 2 A magnified view of part A;

[0029] Figure 4 is a schematic diagram of the structure of the driving ramp;

[0030] Figure 5 Schematic diagram of the structure of the fluid storage capsule.

[0031] Figure numerals: 1. stirring chamber; 2. reactor; 3. stirring shaft; 4. stirring plate; 5. fixed part; 6. movable part; 7. sliding chamber; 8. ejection mechanism; 9. visual mechanism; 10. through hole; 11. mounting frame; 12. connecting rod; 13. baffle; 14. clear liquid area; 15. mixing area; 16. sedimentation area; 17. detection part; 18. controller; 19. dosing mechanism; 20. driving ramp; 21. driving spring; 22. liquid storage capsule; 23. liquid outlet; 24. pressure valve; 25. extrusion rod. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0033] Embodiment 1:

[0034] like Figures 1 to 5 As shown, a flocculation and sedimentation device for sewage treatment includes a reactor 2 having a stirring chamber 1, and a stirring shaft 3 extending into the stirring chamber 1 is provided on the reactor 2, and the stirring shaft 3 can rotate by being driven by a rotating driving source such as a motor. In addition, a stirring plate 4 is also provided on the side wall of the stirring shaft 3. During flocculation treatment, the stirring shaft 3 drives the stirring plate 4 to rotate and stir the sewage and flocculant in the stirring chamber 1, and then the impurities in the sewage will flocculate and settle.

[0035] In order to achieve an adjustable stirring area of ​​the stirring plate 4, in the present invention, the stirring plate 4 is adapted to include a fixed portion 5 and a movable portion 6, and a stirring surface in contact with the sewage is formed by combining the fixed portion 5 and the movable portion 6. In addition, the movable portion 6 is also adapted to be retractable into the fixed portion 5, so as to change the size of the stirring surface.

[0036] For example, when the stirring surface decreases, at the same rotation speed of the stirring shaft 3, the stirring force of the stirring plate 4 on the sewage decreases, and the contact area between the flocculants in the sewage and the stirring plate 4 (i.e., the stirring area) decreases, and the flocculants are not easy to disintegrate; on the contrary, in the early stage of flocculation treatment, the stirring surface can maintain a larger contact area, thereby exerting sufficient stirring force on the sewage and flocculant to increase the flocculation rate of the sewage.

[0037] like Figure 1As shown, in some embodiments, the specific form of the stirring plate 4 is: a sliding cavity 7 is constructed on the fixed part 5, and the movable part 6 is slidably adapted in the sliding cavity 7. When the stirring surface needs to be reduced, the movable part 6 can be controlled to move and be retracted into the sliding cavity 7; and when the stirring surface needs to be increased, the movable part 6 can be reversely controlled to slide out of the sliding cavity 7. In a possible approach, an ejection mechanism 8 is provided in the sliding cavity 7. For example, the ejection mechanism 8 can be an electric cylinder or a pneumatic cylinder. The ejection and retraction of the movable part 6 by the execution end of the ejection mechanism 8 can realize the above-mentioned control process of the movable part 6.

[0038] In a preferred example, a visual mechanism 9 is also provided on the top of the stirring chamber 1, for example, the visual mechanism 9 can be composed of a camera and a control module. The area of ​​the flocs in the sewage can be photographed and detected by the camera, and the control module can determine the number of flocs in the sewage by judging the change in the area. For example, after the area of ​​the flocs photographed by the camera reaches a threshold, the control module synchronously controls, for example, the above-mentioned ejection mechanism 8 to retract or push out the movable part 6. Specifically, as flocculation proceeds, the flocs will gradually increase in the sewage. After reaching the threshold, the control module will control the ejection mechanism 8 to further retract the movable part 6 into the sliding chamber 7, thereby reducing the area of ​​the stirring surface without causing shear disintegration of the flocs.

[0039] The above thresholds can be set to multiple values, which can be optimized according to the progress of the flocculation reaction, which is known to those skilled in the art, so no further details are given. Of course, the threshold can also be set only when the flocs are saturated, and after a certain threshold time, the control module can also control the stirring shaft 3 to stop rotating, and the flocculation process can be determined to be completed at this time.

[0040] like Figure 2 , Figure 3 As shown, in other embodiments, the specific form of the stirring plate 4 is: a through hole 10 is formed through the fixed portion 5, and the movable portion 6 is adapted to cover the through hole 10 to varying degrees. When the stirring surface needs to be increased, the movable portion 6 can be controlled to continue to move at the through hole 10 into the center of the through hole 10, at which time the overlapping area between the movable portion 6 and the fixed portion 5 gradually decreases, but the through hole 10 will be gradually blocked; and when the stirring surface needs to be reduced, the movable portion 6 is reversely controlled to move at the through hole 10 and retract into the fixed portion 5, that is, the overlapping area between the movable portion 6 and the fixed portion 5 will increase, and the through hole 10 will be gradually opened.

[0041] It can be understood that, compared with the stirring plate 4 without the through holes 10 , the flocs can pass through the through holes 10 , and the flocs are less likely to be sheared and disintegrated.

[0042] For example, the movable portion 6 may include a plurality of movable plates (not shown) uniformly distributed along the circumference of the through hole 10, and a driving mechanism (not shown) is further provided on the fixed portion 5, and the driving mechanism is used to drive the plurality of movable portions 6 to simultaneously enter or move out of the through hole 10. This structure can refer to the iris mechanism in the prior art, and will not be described in detail in the present invention. In possible cases, the visual mechanism 9 may transmit a control signal to the driving mechanism according to the judgment result, so as to realize the further opening or further covering of the through hole 10 as expected.

[0043] In other solutions, the movable portion 6 may include a connecting rod 12 and a baffle 13 disposed on the connecting rod 12, and the connecting rod 12 is adapted to be able to move in the axial direction, thereby changing the covering area of ​​the baffle 13 and the through hole 10. For example, a plurality of through holes 10 may be opened in the axial direction on the fixed portion 5, and a baffle 13 is disposed on the connecting rod 12 corresponding to each through hole 10, and after the connecting rod 12 moves, each baffle 13 may synchronously cover or open the corresponding through hole 10.

[0044] In a more preferred case, a mounting frame 11 is provided on the side wall of the stirring shaft 3, and the fixed part 5 is elastically adapted in the mounting frame 11 along the tangential direction. For example, a spring may be provided between the fixed part 5 and the mounting frame 11, and the spring is used to exert an elastic reset force on the fixed part 5, especially to maintain the initial natural position of the fixed part 5. As the flocculation treatment proceeds, floccules in the sewage will continue to be generated, and the resistance of the sewage to the fixed part 5 will increase. Under the action of pressure, the fixed part 5 will squeeze the spring and bounce, and the movable part 6 can simultaneously open the through hole 10, so that the floccules can pass through the through hole 10 with an increased diameter without being easily disintegrated.

[0045] The automatic enlargement of the via 10 can be achieved, for example, by the above-mentioned driving mechanism. Figure 4 As shown, in other schemes, a driving inclined surface 20 can also be provided on the inner side wall of the mounting frame 11, and a driving spring 21 can also be connected to the connecting rod 12. Under the elastic force of the driving spring 21, the connecting rod 12 will abut against the driving inclined surface 20. It can be understood that as the fixing portion 5 is pressed and elastic, the end of the connecting rod 12 will slide along the driving inclined surface 20, and since the driving inclined surface 20 has an inclination, the driving spring 21 can push the connecting rod 12 to move. Among them, the inclination direction of the driving inclined surface 20 and the matching relationship between the baffle 13 and the through hole 10 can be selected according to actual conditions, which is the basic ability of those skilled in the art, so it will not be repeated.

[0046] As the flocculation process proceeds, the stirring chamber 1 can be defined as a clear liquid zone 14, a mixing zone 15 and a precipitation zone 16 from top to bottom. The clear liquid zone 14, the mixing zone 15 and the precipitation zone 16 are each provided with at least one stirring plate 4. Figure 2The figure preferably shows a situation where only one stirring plate 4 is provided in each of the three zones, and for the sake of convenience of description, the three stirring plates 4 are defined as stirring plate 4 one, stirring plate 4 two and stirring plate 4 three from top to bottom.

[0047] More specifically, the mounting frames 11 on the three stirring plates 4 are all provided with detection members 17, and the detection members 17 are adapted to detect the spring position of the fixing part 5. That is, the detection member 17 can detect the specific position of the fixing part 5 in the mounting frame 11 along the tangential direction, for example, the detection member 17 can be an infrared sensor or a displacement sensor. In addition, the present invention may further include a controller 18 and a dosing mechanism 19, wherein the controller 18 is electrically connected to the detection member 17, and the controller 18 is configured and designed so that the present invention has at least the following usage modes:

[0048] 1. Stop mode: In this mode, as the flocculation process proceeds, the fixing portion 5 of the stirring plate 4 gradually returns to the natural position, and the corresponding detection element 17 can transmit an electrical signal to the controller 18. After the controller 18 receives the signal that the fixing portion 5 is in the natural position, it synchronously controls the stirring shaft 3 to stop rotating. At this time, it can be determined that the flocculation process is completed;

[0049] 2. Dosing mode: In this mode, as the flocculation process proceeds, the fixed portion 5 of the stirring plate 4 has not yet been reset to the natural state (that is, the fixed portion 5 is still in a state of being elastic under pressure), but the fixed portion 5 of the stirring plate 4 has undergone a reset stroke, and then the corresponding detection member 17 transmits the electrical signal to the controller 18. At this time, the controller 18 will control the dosing mechanism 19 to add medicine to the stirring chamber 1, that is, continue to add flocculant.

[0050] It can be understood that in the above-mentioned shutdown mode, the flocculants in the clear liquid area 14 will gradually sink into the sedimentation area 16. At this time, the resistance encountered by the stirring plate 4 in the clear liquid area 14 is reduced, so the fixing portion 5 of the stirring plate 4 will gradually return to the natural position. It can be judged that the sewage in the clear liquid area 14 is in the expected clear liquid state and the flocculation treatment is completed.

[0051] In the above-mentioned dosing mode, due to the insufficient amount of flocculant added, the sewage in the clear liquid area 14 is still in a turbid state, and the fixed part 5 of the stirring plate 4 cannot always return to the natural position. However, due to the continuous stirring of the stirring shaft 3, the flocculants in the sedimentation area 16 will tend to disintegrate again, and the fixed part 5 of the stirring plate 4 will have a reset stroke. At this time, it can be automatically determined that the flocculant is insufficiently added, and then the dosing mechanism 19 under the control of the controller 18 automatically adds the flocculant into the stirring chamber 1 to ensure the effect of sewage flocculation treatment.

[0052] For example, the drug adding mechanism 19 may include a drug storage tank, which is provided with an electromagnetic opening and closing port (not shown). Under the control of the controller 18, the opening of the drug storage tank can be automatically opened and closed, thereby realizing the electrically controlled drug addition into the stirring chamber 1.

[0053] like Figure 4 , Figure 5 As shown, in other examples, the dosing mechanism 19 may include a liquid storage capsule 22 arranged on the fixed portion 5 of the stirring plate 4-1, and the liquid storage capsule 22 is provided with a liquid outlet 23, and a pressure valve 24 is provided in the liquid outlet 23; the fixed portion 5 of the stirring plate 4-3 is provided with an extrusion rod 25, and the extrusion rod 25 extends to be opposite to the liquid storage capsule 22. For example, at the beginning of the flocculation process, floccules are generated in the three regions, so that the three fixed portions 5 will all be compressed and elastic, and at this time, the distance between the extrusion rod 25 and the liquid storage capsule 22 does not change too much; while in the dosing mode, the fixed portion 5 of the stirring plate 4-1 is in a constant tangential position under the action of resistance, and the fixed portion 5 of the stirring plate 4-3 has a reset stroke due to the disintegration of the floccules, at this time, the extrusion rod 25 will gradually approach the liquid storage capsule 22 and squeeze it, and under the action of pressure, the flocculant in the liquid storage capsule 22 will be pumped out from the liquid outlet 23, thereby realizing mechanized and more reliable automatic dosing.

[0054] Embodiment 2:

[0055] A flocculation and sedimentation method for sewage treatment, comprising the flocculation and sedimentation device for sewage treatment in embodiment 1, and further comprising the following steps:

[0056] S1, introducing the sewage to be treated into the stirring chamber 1 and adding flocculant;

[0057] S2, driving the stirring shaft 3 to rotate so that the stirring plate 4 stirs the sewage and the flocculant;

[0058] In S2, when the stirring force needs to be reduced, the movable part can be driven to retract into the fixed part, thereby reducing the area of ​​the stirring surface.

[0059] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A flocculation and sedimentation device for sewage treatment, comprising a reactor (2) having a stirring chamber (1), wherein a stirring shaft (3) is rotatably arranged in the stirring chamber (1), and a stirring plate (4) is arranged on the side wall of the stirring shaft (3), wherein: The stirring plate (4) comprises a fixed portion (5) and a movable portion (6), wherein the fixed portion (5) and the movable portion (6) are assembled to form a stirring surface, and the movable portion (6) is adapted to be retractable into the fixed portion (5), thereby changing the size of the stirring surface; The fixed portion (5) is provided with a through hole (10) extending therethrough, and the movable portion (6) is adapted to cover the through hole (10) to different degrees, and the size of the stirring surface is adjusted by changing the covering area of ​​the through hole (10) by the movable portion (6), and the contact area between the stirring plate and the flocculent is changed by adjusting the size of the stirring surface; A mounting frame (11) is provided on the side wall of the stirring shaft (3), the fixing portion (5) is elastically adapted in the mounting frame (11) along the tangential direction, and the movable portion (6) is adapted to further open the through hole (10) as the fixing portion (5) is elastically adapted under pressure.

2. The flocculation and sedimentation device for sewage treatment according to claim 1 is characterized in that: The movable portion (6) comprises a connecting rod (12) and a baffle (13) arranged on the connecting rod (12); the connecting rod (12) is adapted to be movable in the axial direction, thereby changing the covering area of ​​the baffle (13) on the through hole (10).

3. The flocculation and sedimentation device for sewage treatment according to claim 1 is characterized in that: The stirring chamber (1) comprises, from top to bottom, a clear liquid area (14), a mixing area (15) and a sedimentation area (16), each of which is provided with at least one stirring plate (4), and each of which is provided with a detection element (17) on the mounting frame (11) in the clear liquid area (14) and the sedimentation area (16). The detection element (17) is capable of detecting the elastic position of the fixing part (5). The flocculation sedimentation device further comprises a controller (18) and a dosing mechanism (19), the controller (18) being electrically connected to the detection element (17), and the controller (18) being configured and designed so that the flocculation sedimentation device has at least the following usage modes: Stop mode: the fixing portion (5) in the clear liquid area (14) is reset to a natural position, and the corresponding detection element (17) transmits an electrical signal to the controller (18), at which time the controller (18) controls the stirring shaft (3) to stop rotating; Dosing mode: the fixed part (5) in the precipitation area (16) undergoes a reset stroke, and the corresponding detection element (17) transmits an electrical signal to the controller (18), and at this time the controller (18) controls the dosing mechanism (19) to perform dosing; Wherein, in the drug adding mode, the fixing portion (5) in the clear liquid area (14) is in a compressed and elastic state.

4. The flocculation and sedimentation device for sewage treatment according to claim 2 is characterized in that: A driving inclined surface (20) is provided on the inner side wall of the installation frame (11), and a driving spring (21) is connected to the connecting rod (12), wherein the driving spring (21) is used to push the connecting rod (12) to abut against the driving inclined surface (20).

5. The flocculation and sedimentation device for sewage treatment according to claim 3 is characterized in that: The flocculation sedimentation device further comprises a dosing mechanism (19), the dosing mechanism (19) comprising a liquid storage capsule (22) arranged on the fixed portion (5) in the clear liquid area (14), the liquid storage capsule (22) being provided with a liquid outlet (23), a pressure valve (24) being provided in the liquid outlet (23), and an extrusion rod (25) being provided on the fixed portion (5) in the sedimentation area (16), the extrusion rod (25) extending to be aligned with the liquid storage capsule (22).

6. A flocculation and sedimentation method for sewage treatment, comprising the flocculation and sedimentation device for sewage treatment according to claim 1, characterized in that: The steps include: S1, introducing the sewage to be treated into the stirring chamber (1) and adding a flocculant; S2, driving the stirring shaft (3) to rotate so that the stirring plate (4) stirs the sewage and the flocculant; Wherein, in S2, when the stirring force needs to be reduced, the movable part (6) can be driven to retract into the fixed part (5), thereby reducing the area of ​​the stirring surface.

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