A mechanical hydraulic flocculation sedimentation tank

Abstract

The present invention relates to a mechanical hydraulic flocculation sedimentation tank, wherein a mixing zone and a flocculation zone are arranged in the middle of the tank body, a water inlet pipe is arranged in the mixing zone, the mixing zone is connected with the flocculation zone, a flocculation stirring paddle and a guide tube matched with the flocculation stirring paddle are arranged in the flocculation zone, water outlet zones are arranged at the two sides of the tank body, a water outlet trough is arranged in the water outlet zone, a water distribution zone is arranged between the flocculation zone and the water outlet zone, the flocculation zone and the water distribution zone are divided by a group of folding plate zones, and a mud accumulation zone is arranged at the bottom of the tank. When in use, the hydraulic flocculation effect after the high-efficiency mechanical flocculation is enhanced, and the flocculation order is increased and the flocculation effect is enhanced without changing the overall structure and operation mode of the flocculation tank.

Description

Technical Field

[0001] The invention relates to the technical field of sedimentation tanks, in particular to a mechanical hydraulic flocculation sedimentation tank, and more particularly to a high-efficiency sedimentation tank combining mechanical flocculation with hydraulic flocculation. Background Art

[0002] High-efficiency flocculation processes usually use coagulants to improve flocculation efficiency, thereby reducing the residence time and floor space of the flocculation tank. Currently, the most widely used high-efficiency flocculation processes usually use polymer coagulants PAM and improve the efficiency of floc aggregation and sedimentation in the flocculation process through sludge return. In order to achieve an efficient flocculation process, the flocculation process usually uses a mechanical flocculation process and increases the number of mechanical flocculation cycles through a guide tube, thereby increasing the probability of floc collision.

[0003] However, the high-efficiency mechanical flocculation process guide tube can only increase the number of cycles, but cannot solve the problem of short-flow in mechanical flocculation. High-efficiency mechanical flocculation usually has only one flocculation tank. After short-flow, the flocs that have not fully reacted directly enter the sedimentation area, affecting the sedimentation effect, thereby reducing the effluent quality of the sedimentation tank. Through a large number of engineering examples and mathematical model analysis, it is found that the short-flow problem has become a bottleneck affecting the effect of high-efficiency mechanical flocculation, and there is no effective solution so far.

[0004] At the same time, since the high-efficiency flocculation sedimentation tank is compactly arranged, the internal transformation is very difficult. Therefore, in the prior art, there is an urgent need for a high-efficiency sedimentation tank that can not only efficiently circulate but also solve the problem of mechanical flocculation short flow. Summary of the invention

[0005] The object of the present invention is to provide an improved mechanical hydraulic flocculation sedimentation tank, which combines mechanical flocculation with hydraulic flocculation to increase the flocculation order, reduce the short-flow phenomenon in the flocculation tank, and improve the flocculation efficiency and treatment efficiency.

[0006] In order to achieve the above-mentioned purpose, the technical scheme of the present invention is: a mechanical hydraulic flocculation sedimentation, characterized in that: a mixing zone and a flocculation zone are provided in the middle of the pool body, the mixing zone is provided with a water inlet pipe, the mixing zone is connected with the flocculation zone, a flocculation stirring paddle and a guide tube matched with the flocculation stirring paddle are provided in the flocculation zone, water outlet zones are provided on both side edges of the pool body, a water outlet trough is provided in the water outlet zone, a water distribution zone is provided between the flocculation zone and the water outlet zone, the flocculation zone and the water distribution zone are divided by a group of folding plate zones, the above-mentioned mixing zone, flocculation zone, water distribution zone and water outlet zone are all arranged in the middle and upper positions of the pool body, and a mud accumulation zone is provided at the bottom of the pool.

[0007] Preferably, a group of folding plates includes an inner folding plate and an outer folding plate corresponding to the inner folding plate, the bottom of the outer folding plate is connected to the bottom plate of the flocculation zone, a water hole is provided between the outer folding plate and the bottom plate of the flocculation zone, and a gap is provided between the inner folding plate and the outer folding plate.

[0008] Furthermore, the mixing zone is divided into two left and right sub-mixing zones symmetrically arranged along the water inlet pipe, and a mixing paddle is arranged at the center of each sub-mixing zone; the water outlet zone is provided with an inclined pipe and a water outlet trough connected to the inclined pipe.

[0009] Compared with the prior art, the technical solution of the present invention not only improves the overall technical solution, but also includes many improvements in details. Specifically, it has the following beneficial effects:

[0010] 1. In the improved scheme of the present invention, a water distribution area is provided between the flocculation area and the water outlet area, and the flocculation area and the water distribution area are divided by a group of folded plate areas. The folded plates are used to replace the original flocculation magnetic structure wall panels, thereby enhancing the hydraulic flocculation effect after mechanical flocculation;

[0011] 2. In the technical solution of the present invention, a group of folding plates includes an inner folding plate and an outer folding plate corresponding to the inner folding plate, a gap is provided between the inner folding plate and the outer folding plate, and the inner and outer folding plates form relative folding plates to improve the hydraulic flocculation effect and flocculation strength;

[0012] 3. In the enhanced technical solution of the present invention, the bottom of the outer folded plate is connected to the bottom plate of the flocculation zone, and a water hole is provided between the outer folded plate and the bottom plate of the flocculation zone to balance the water pressure difference inside and outside the flocculation tank, solving the problem that the flocculation zone cannot withstand the lateral water pressure;

[0013] 4. The present invention has a simple structure, low cost, is easy to process and assemble, and is conducive to promotion and utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention.

[0015] Figure 2 for Figure 1 Sectional view along AA direction.

[0016] Reference numerals:

[0017] 1 mixing zone, 2 flocculation zone, 3 water distribution zone, 4 water outlet zone, 5 mud accumulation zone, 6 folding plate zone, 7 water hole;

[0018] 21 flocculation stirring paddle, 22 guide tube;

[0019] 61 inner folding plate, 62 outer folding plate. DETAILED DESCRIPTION

[0020] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] The present invention provides a mechanical hydraulic flocculation sedimentation tank, see Figure 1 The difference between the present invention and the prior art lies in that a mixing zone 1 and a flocculation zone 2 are provided in the middle of the pool body, a water inlet pipe is provided in the mixing zone, the mixing zone is connected with the flocculation zone, a flocculation stirring paddle 21 and a guide tube 22 matched with the flocculation stirring paddle are provided in the flocculation zone, water outlet zones are provided at the two side edges of the pool body, a water outlet trough is provided in the water outlet zone, a water distribution zone 3 is provided between the flocculation zone and the water outlet zone, the flocculation zone and the water distribution zone are divided by a group of folding plate zones, the above-mentioned mixing zone, flocculation zone, water distribution zone and water outlet zone are all arranged in the middle and upper layers of the pool body, and a mud accumulation zone is provided at the bottom of the pool.

[0022] In general, a mechanical flocculation tank is more of a "tank", that is, the structural wall panels of the flocculation tank separate the flocculation area from the sedimentation area on the one hand, and bear the lateral pressure of the incoming water on the other hand. Combined with the requirements of the flocculation process, the separation function of the wall panels is a necessary function, while bearing pressure is not a necessary function. The present invention uses this feature to delete the structural wall panels of the flocculation tank and cleverly combine them with stainless steel folding plates. In this way, the stainless steel folding plates weaken the need for unnecessary structural force while satisfying the separation function, but strengthen the water flocculation effect after mechanical flocculation.

[0023] Specifically, the inner folded plate changes the flow pattern outside the mechanical flocculation guide tube. On the one hand, the change in the plane aspect ratio increases the horizontal velocity fluctuation outside the guide tube, and on the other hand, the change in the vertical flow section increases the vertical velocity fluctuation outside the guide tube, further improving the flocculation effect. The outer folded plate replaces the concrete pool wall. On the one hand, it forms a relative fold with the inner folded plate to improve the hydraulic flocculation effect, and on the other hand, it also increases the flocculation strength of the water distribution area, which is conducive to strengthening the adsorption bridging and sweeping effect of the flocs in the water distribution area.

[0024] It is different from the prior art in that:

[0025] 1. Compared with the traditional high-efficiency mechanical flocculation sedimentation tank, the present invention deletes the structural wall panels of the flocculation tank, and uses stainless steel folded plates to replace the original structural wall panels, abandoning the function of the original flocculation tank structural wall panels to withstand lateral water pressure, and enhancing the hydraulic flocculation effect after mechanical flocculation.

[0026] 2. Compared with the traditional high-efficiency mechanical flocculation sedimentation tank, the present invention adds hydraulic flocculation after mechanical flocculation, improves the flocculation stage, and greatly reduces the short-circuit phenomenon of the traditional high-efficiency mechanical flocculation tank.

[0027] 3. Compared with the traditional high-efficiency mechanical flocculation sedimentation tank, the inner folded plate of the flocculation tank of the present invention changes the flow state outside the mechanical flocculation guide tube. On the one hand, the change in the plane aspect ratio increases the horizontal flow velocity fluctuation outside the guide tube. On the other hand, the change in the vertical flow section increases the vertical flow velocity fluctuation outside the guide tube, further improving the flocculation effect.

[0028] 4. Compared with the traditional high-efficiency mechanical flocculation sedimentation tank, the outer folded plate of the flocculation tank of the present invention replaces the concrete tank wall. On the one hand, it forms a relative folded plate with the inner folded plate to improve the hydraulic flocculation effect. On the other hand, it also increases the flocculation strength in the water distribution area, which is beneficial to strengthen the adsorption bridging and sweeping effect of the flocs in the water distribution area.

[0029] 5. Compared with the traditional high-efficiency mechanical flocculation sedimentation tank, the present invention has a water hole at the bottom of the flocculation tank, which is semi-fixedly blocked by a flexible rubber plate. When the water level difference between the inside and outside of the flocculation tank is greater than 20cm, the rubber plate is forced to open to balance the water level difference between the inside and outside of the flocculation tank, reduce the lateral stress on the folded plate caused by the pressure difference, and protect the safety of the folded plate.

[0030] 6. Compared with the traditional high-efficiency mechanical flocculation sedimentation tank, the present invention uses stainless steel folded plates instead of concrete structural wall panels. Since the thickness of the stainless steel folded plates is smaller than that of the concrete wall panels, the effective volume is increased without changing the floor area, and the flocculation reaction time is improved.

[0031] 7. Compared with the traditional high-efficiency mechanical flocculation sedimentation tank, the present invention does not change the overall size and structure, can be used for the renovation of existing structures, and can also be used for new construction projects, and the technology is highly applicable.

[0032] In one embodiment, the sedimentation tank of the present invention mainly includes five parts: a mixing zone, a flocculation zone, a water distribution zone, a water outlet zone and a mud accumulation zone. Among them, the mixing zone adopts mechanical mixing to achieve rapid mixing of coagulants and other agents. The flocculation zone adopts a new type of high-efficiency mechanical hydraulic flocculation sedimentation tank to improve the flocculation efficiency. The water distribution zone is affected by the new type of high-efficiency mechanical hydraulic flocculation sedimentation tank, which improves the flocculation effect while distributing water. The water outlet zone adopts an inclined pipe and a stainless steel water outlet trough. The mud accumulation zone adopts a bottom scraper to increase the bottom mud concentration and discharge mud regularly.

[0033] Specifically, a group of folded plate areas includes an inner folded plate and an outer folded plate corresponding to the inner folded plate. The bottom of the outer folded plate is connected to the bottom plate of the flocculation zone. A water hole is provided between the outer folded plate and the bottom plate of the flocculation zone, and a gap is provided between the inner folded plate and the outer folded plate. In order to be more suitable for different applications, the gap between the inner and outer folded plates 61 and 62 is related to the size of the flocculation zone. If the outer side length of the flocculation zone is set to A, the maximum distance between the two inner folded plates is 0.8A, and the minimum spacing between the inner and outer folded plates, that is, the peak spacing between the folded plates is 0.1A. This flocculation tank determines the folded plate arrangement form by the flow velocity between the folded plates to ensure the flocculation effect. The flocculation zone and the folded plate arrangement should make the flow velocity V3 in the water distribution zone < the flow velocity V3 between the folded plates. 谷 <Folding plate peak flow rate V 峰<Flow velocity V2 between the guide tube and the inner folding plate. Here, the inner and outer folding plates form a folding plate layout. The so-called folding layout means that the two plates are symmetrically arranged along the center line between the two plates. Here, the height of the inner folding plate is greater than the height of the outer folding plate. The setting of the height distance makes the flow velocity V1 of the water hole at the top of the outer folding plate meet the following requirements: water distribution area flow velocity V3 < outer folding plate bottom water hole flow velocity V1 < folding plate valley flow velocity V 谷 .

[0034] Furthermore, the inner and outer folding plates 61 and 62 are made of 60-degree relative folding plates made of stainless steel, and the top of the inner folding plate is higher than the outer folding plate. A bending plate is provided between the water distribution area and the water outlet area. The bending plate initially forms an angle of 45° with the horizontal plane, and the angle between the lower end of the bending plate and the horizontal plane is 60°. The bending plate and the guide plate of the water distribution area form a gradual diffusion, so that the flocculation strength gradually decreases, which is conducive to the formation of flocs, and the flocs gradually increase, thereby improving the flocculation effect. The mixing area is divided into two left and right sub-mixing areas symmetrically arranged along the water inlet pipe, and a mixing and stirring paddle is provided at the center of each sub-mixing area; the water outlet area is provided with an inclined pipe with an inclination angle of 60° intersecting the horizontal plane, and a water outlet trough connected to the inclined pipe, the top of the inclined pipe is 0.8~1.0m away from the water surface of the water outlet area, and the bottom of the inclined pipe is more than 3m away from the top of the mud accumulation area.

[0035] The influent of flocculation zone 2 is the effluent of mixing zone 1 after coagulation. The flocculation zone mainly adopts stirring paddles and guide tubes to make the water flow in the flocculation tank circulate multiple times inside and outside the guide tube to perform flocculation. After mechanical flocculation, two hydraulic folding plate flocculations are used instead of structural wall panels, which enhances the hydraulic flocculation effect without changing the size of the flocculation zone, improves the flocculation level, and reduces the short-circuit phenomenon. Specifically, the mixing zone is divided into two left and right sub-mixing zones symmetrically arranged along the water inlet pipe, and a mixing stirring paddle is provided at the center of each sub-mixing zone; the flocculation zone is also divided into left and right flocculation zones, and the positions of the left and right flocculation zones are respectively arranged corresponding to the left and right sub-mixing zones, and the outlet zone is provided with an inclined pipe and an outlet trough connected to the inclined pipe.

[0036] The main purpose of the water distribution area 3 is to ensure that the effluent from the flocculation area is evenly distributed to the sedimentation tank for mud-water separation, while also taking into account the post-flocculation effects such as adsorption bridging and sweeping. Since stainless steel folded plates are used to replace the original structural wall panels, one side of the water distribution area 3 is a stainless steel folded plate, which also enhances the hydraulic flocculation effect.

[0037] In another embodiment, a high-efficiency mechanical hydraulic flocculation sedimentation tank utilizes stainless steel folding plates to replace the structural wall panels of the flocculation tank, and hydraulic flocculation is added after mechanical flocculation. The mechanical flocculation is a mechanical flocculation device that cooperates with a guide tube and other guide devices to achieve rapid circulation inside and outside the guide tube, thereby increasing the probability of floc collision. The hydraulic flocculation mainly refers to adding two inner and outer folding plates on the outlet side of the mechanical flocculation tank. The purpose of the inner folding plate is to increase the flocculation level and alleviate the serious short-flow problem caused by the completely mixed reaction flow state in the original mechanical flocculation tank. The purpose of the outer folding plate is to replace the wall panel on one side of the flocculation tank and form a relative folding plate flocculation with the inner folding plate, thereby adding hydraulic flocculation after the mechanical flocculation process.

[0038] Specifically, the inner and outer folding plates are made of 60-degree relative folding plates made of stainless steel, and the top of the inner folding plate is higher than the outer folding plate. A semi-closed and semi-open rubber plate is provided on the surface of the water hole to balance the water pressure difference inside and outside the flocculation area. When the water level difference inside and outside the flocculation tank is greater than 20 cm, the rubber plate is forced to open to balance the water level difference inside and outside the flocculation tank, reduce the lateral stress on the folding plate caused by the pressure difference, and protect the safety of the folding plate. A sludge scraper is provided at the bottom of the sludge area. The present invention uses stainless steel folding plates instead of concrete structural wall panels. Since the thickness of the stainless steel folding plates is smaller than that of the concrete wall panels, the effective volume is increased without changing the floor area, and the flocculation reaction time is improved. Compared with the traditional high-efficiency mechanical flocculation sedimentation tank, the present invention does not change the overall size and structure, and can be used for the renovation of existing structures, and can also be used for new projects, and the technology is highly applicable.

[0039] The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to the above descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the scope of protection of the present invention.

Claims

1. A mechanical hydraulic flocculation sedimentation tank, characterized in that: A mixing zone and a flocculation zone are provided in the middle of the pool body, the mixing zone is provided with a water inlet pipe, the mixing zone is connected with the flocculation zone, a flocculation stirring paddle and a guide tube matched with the flocculation stirring paddle are provided in the flocculation zone, water outlet zones are provided at both sides of the pool body, the water outlet zone is provided with a water outlet trough, a water distribution zone is provided between the flocculation zone and the water outlet zone, the flocculation zone and the water distribution zone are divided by a group of folding plate areas, the above-mentioned mixing zone, flocculation zone, water distribution zone and water outlet zone are all arranged in the middle and upper positions of the pool body, and a mud accumulation zone is provided at the bottom of the pool; the group of folding plates includes an inner folding plate and an outer folding plate corresponding to the inner folding plate, the bottom of the outer folding plate is connected with the bottom plate of the flocculation zone, a water through hole is provided between the outer folding plate and the bottom plate of the flocculation zone, a gap is provided between the inner folding plate and the outer folding plate, a semi-closed and semi-open rubber plate is provided on the surface of the water through hole to balance the water pressure difference inside and outside the flocculation zone, the inner folding plate and the outer folding plate are made of 60-degree relative folding plates, and the top of the inner folding plate is higher than the outer folding plate.

2. A mechanical hydraulic flocculation sedimentation tank according to claim 1, characterized in that: The mixing zone is divided into two left and right sub-mixing zones symmetrically arranged along the water inlet pipe. A mixing paddle is provided at the center of each sub-mixing zone. The water outlet zone is provided with an inclined pipe with an inclination angle of 60° intersecting the horizontal plane, and a water outlet trough connected to the inclined pipe. The top of the inclined pipe is 0.8~1.0m away from the water surface of the water outlet zone, and the bottom of the inclined pipe is more than 3m away from the top of the mud accumulation area.

3. The mechanical hydraulic flocculation sedimentation tank according to claim 1, characterized in that: The inner and outer folding plates are made of stainless steel.

4. The mechanical hydraulic flocculation sedimentation tank according to claim 1, characterized in that: A sludge scraper is provided at the bottom of the sludge area.

5. The mechanical hydraulic flocculation sedimentation tank according to claim 1, characterized in that: A bending plate is provided between the water distribution area and the water outlet area, and the angle between the lower end of the bending plate and the horizontal plane is 60°.

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