Mechanical stirring clarification tank

Abstract

The mechanical stirring clarification tank provided by the utility model comprises a tank body 1, a reaction chamber 2, a stirrer impeller 3, a water inlet pipe 5, a sludge discharge pipe 6, a clear water collecting tank and a water outlet pipe 7, and further comprises an air dissolving system 14 which is positioned outside the tank body 1 and is used for conveying pressure dissolved air water; the dissolved air releaser 9 is positioned on the side wall of the reaction chamber 2 and is used for receiving the pressure dissolved air water conveyed from the air dissolving system 14 so as to release microbubbles; the residue discharge groove 15 is positioned on the side wall of the pool body 1, the upper end of the residue discharge groove 15 is higher than the liquid level, and the residue discharge groove 15 is used for collecting fine particle sticky substances adsorbed by the microbubbles and brought out by floating; and the slag discharge pipe 11 is positioned on the side wall of the tank body 1, is lower than the slag discharge groove 15 and is used for discharging the fine-particle sticky substances so as to complete a solid-liquid separation process, so that the problems of low treatment efficiency and the like in a traditional air floatation tank front-adding mixed flocculation method are solved, clarification and air floatation processes can be effectively combined, and complex water quality, algae-laden water and the like can be handled.

Description

Technical Field

[0001] The utility model relates to the field of water treatment in the municipal industry, and particularly relates to a mechanical agitation clarifier. Background Art

[0002] The main function of the clarifier is to carry out water coagulation, remove suspended solids and colloids in the water, and make the raw water get clarified quickly. It uses the sludge in a suspended state as a contact medium to have a contact agglomeration effect with the fine suspended solids in the raw water, and simultaneously carry out the coagulation and sedimentation processes in the same structure.

[0003] The air flotation process is a process in which water, bubbles and flocs, that is, the liquid, gas and solid three-phase contact. According to the contact flocculation theory, the stronger the hydrophobicity of solid particles, the easier it is for the solid and bubble phases to adhere. Therefore, it is necessary to carry out hydrophobic treatment on the solid particles (i.e., impurities) in the water, that is, it is necessary to add an appropriate amount of coagulant to the water to form hydrophobic flocs. These hydrophobic flocs are extremely easy to adhere to the negatively charged microbubbles on the surface, forming flocs that can float and separate from the water. The air flotation method is a rapid solid-liquid separation method, which can be completed in only ten-odd minutes, and the effluent turbidity is low and the water quality is stable. Compared with sedimentation tanks and clarifiers, the air flotation tank has the shortest residence time, the shallowest pool depth and the smallest floor area.

[0004] There are many types of existing air flotation tanks, and common ones include traditional horizontal flow air flotation tanks, vertical flow air flotation tanks, vertical folding flow air flotation tanks, comprehensive aeration purifiers and other types. Among them, the traditional horizontal flow air flotation tank is mainly composed of a tank body, an aeration device, a skimming device, a sludge scraping device and other parts. It is simple to operate and easy to maintain, but it has a large floor area and unstable treatment effects. The vertical flow air flotation tank has a compact structure and is mainly composed of a tank body, an aeration device, a central pipe and an overflow weir and other parts. Its treatment effect is more stable than that of the traditional horizontal flow air flotation tank, and it also has a smaller floor area. The vertical folding flow air flotation tank has a higher removal efficiency and also has a smaller floor area, but it has higher design and manufacturing requirements, and the operation and maintenance are also more complex.

[0005] By adding a mixing and flocculation process in front of the air flotation tank, the treatment speed can be increased, the treatment efficiency can be improved, and the treated water quality can be made better. The mixing process can uniformly mix the medicament and water, so that the medicament can be quickly and uniformly diffused into the water, thereby improving the treatment efficiency. The flocculation process can aggregate the suspended solids and colloidal particles in the water to form larger particles, which are more easily removed by the air flotation tank. At the same time, the flocculation process can also improve the coagulation effect of the water and make the treated water quality more stable.

[0006] The traditional methods for adding mixing and flocculation in front of the air flotation tank mainly include the following several types:

[0007] 1. Mechanical stirring flocculation method: This method uses a mechanical stirrer to mix raw water with chemicals, and through the stirring action, the suspended solids and colloidal particles in the water are aggregated together to form larger particles. The advantages of this method are simple equipment and convenient operation, but it has disadvantages such as low treatment efficiency and large floor area.

[0008] 2. Pipe static mixing flocculation method: This method uses the static mixing elements in the pipe mixer to mix raw water with chemicals, and through the vortex action of the mixing elements, the suspended solids and colloidal particles in the water are aggregated together. The advantages of this method are good mixing effect and small floor area, but it has disadvantages such as low treatment efficiency and large chemical consumption.

[0009] 3. Perforated pipe aeration flocculation method: This method uses a perforated pipe aeration device to generate bubbles in the water, and through the upward movement of the bubbles, the suspended solids and colloidal particles in the water are pushed upward, while adding chemicals for coagulation and sedimentation. The advantages of this method are simple equipment and convenient operation, but it has disadvantages such as uneven bubble size and low treatment efficiency.

[0010] In summary, the traditional pre - mixing and flocculation method before the air - flotation tank has the following disadvantages:

[0011] 1. Low treatment efficiency: Due to different water qualities and treatment requirements, the sizes and quantities of suspended solids and colloidal particles are different. The traditional pre - mixing and flocculation method before the air - flotation tank may not be able to completely remove the suspended solids and colloidal particles in the water, resulting in unstable treated water quality.

[0012] 2. Large floor area: The traditional pre - mixing and flocculation method before the air - flotation tank usually requires a large floor area to construct facilities such as sedimentation tanks and reaction tanks, increasing the construction cost.

[0013] 3. Excessive or insufficient chemical addition: The traditional pre - mixing and flocculation method before the air - flotation tank needs to add appropriate chemicals to promote the coagulation and sedimentation effect. However, the types and concentrations of chemicals will affect the treatment effect. Therefore, it is necessary to make appropriate adjustments and optimizations according to different water qualities and water treatment requirements, which increases the complexity and difficulty of operation.

[0014] 4. Inconvenient operation and management: The traditional pre - mixing and flocculation method before the air - flotation tank requires manual operation and management, such as adding chemicals and monitoring water quality, increasing the labor cost and management difficulty.

[0015] The traditional mechanical stirring clarifier is relatively complex. For this reason, the applied and authorized utility model "A Single - Reaction - Chamber Mechanical Stirring Clarifier" is a mechanical stirring clarifier with a relatively simple structure. The structure of the authorized utility model "A Single - Reaction - Chamber Mechanical Stirring Clarifier" is as Figure 1 shown. Utility Model Content

[0016] The utility model aims to provide a mechanical agitation clarifier, which combines the processes of a clarifier and a dissolved air flotation tank, and enables the dissolved air flotation process to replace the original sedimentation process. It can not only solve the problems existing in the flocculation dissolved air flotation process in the related art, but also be applicable to large, medium and small-scale water supply and drainage purification, and is particularly obvious in the treatment of polluted eutrophic water bodies, phosphorus and nitrogen removal from wastewater, and reclamation of reclaimed water.

[0017] According to one aspect of the present utility model, there is provided a mechanical agitation clarifier, which includes a tank body 1, a reaction chamber 2, a stirrer impeller 3, a water inlet pipe 5, a sludge discharge pipe 6, and further includes: a dissolved air system 14, located outside the tank body 1, for conveying pressurized dissolved air water; a dissolved air release device 9, located on the side wall of the reaction chamber 2, for receiving the pressurized dissolved air water conveyed from the dissolved air system 14 to release microbubbles; a slag discharge trough 15, located on the side wall of the tank body 1, the upper end of which is higher than the liquid level, for collecting fine particle adhesives adsorbed and floated out by the microbubbles; a slag discharge pipe 11, located on the side wall of the tank body 1 and lower than the slag discharge trough 15, for discharging the fine particle adhesives to complete the solid-liquid separation process.

[0018] Preferably, the mechanical agitation clarifier further includes: a clear water collection pipe 12, located at the bottom of the tank body 1, for collecting the treated clear water; a clear water collection main pipe 13, for collecting the clear water collected by the clear water collection pipe 12; a clear water collection trough 16, the top of which is flush with the pool wall, for collecting the clear water collected by the clear water collection main pipe 13; an outlet pipe 7, located on the side wall of the tank body 1 and lower than the clear water collection trough 16, for discharging the clear water.

[0019] Preferably, the mechanical agitation clarifier further includes a slag scraper 10, located at the top of the tank body 1, for scraping the particle adhesives floating with the microbubbles and sending them to the slag discharge trough 15 and the slag discharge pipe 11.

[0020] Preferably, the reaction chamber 2 is in an umbrella shape, and the raw water and the muddy water are stirred and mixed at the bottom, rise to the top, and flow back to the bottom along the inner wall of the reaction chamber to enter the cyclic flocculation.

[0021] Preferably, the mechanical agitation clarifier further includes a water inlet 4 located at the center of the bottom of the tank body 1, and the water inlet pipe 5 sends the raw water to the water inlet 4, and then mixes with the muddy water in the tank upward.

[0022] Preferably, a sludge discharge trough is arranged around the water inlet 4, and the sludge discharge trough is connected to the sludge discharge pipe 6 to discharge the excess sludge.

[0023] Preferably, the mechanical agitation clarifier further includes an installation bridge 8, located above the tank body 1.

[0024] Preferably, the reaction chamber 2 and the stirrer impeller 3 are suspended and installed in the middle of the installation bridge 8.

[0025] Preferably, the upper part of the pool body 1 has a square structure, and the bottom chamfer has a circular structure.

[0026] Preferably, the pool bodies 1 are arranged in groups and are rectangular as a whole; the positions and directions of the water inlet pipe 5, the water outlet pipe 7 and the sludge discharge pipe 6 are determined according to the requirements of the plane layout.

[0027] The present utility model provides a mechanical agitation clarifier, which includes a pool body 1, a reaction chamber 2, a stirrer impeller 3, a water inlet pipe 5, and a sludge discharge pipe 6, and further includes: a dissolved air system 14 located outside the pool body 1 for transporting pressurized dissolved air water; a dissolved air release device 9 located on the side wall of the reaction chamber 2 for receiving the pressurized dissolved air water transported from the dissolved air system 14 to release microbubbles; a slag discharge trough 15 located on the side wall of the pool body 1, the upper end of which is higher than the liquid level, for collecting fine particle adhesives adsorbed and floated out by the microbubbles; a slag discharge pipe 11 located on the side wall of the pool body 1 and lower than the slag discharge trough 15 for discharging the fine particle adhesives to complete the solid-liquid separation process, thereby solving the problems such as low treatment efficiency existing in the traditional method of adding mixing and flocculation before the air flotation pool, realizing the effective combination of the clarification and air flotation processes, and being able to handle complex water quality, high-algae water, etc. Description of the Drawings

[0028] The drawings described herein are used to provide a further understanding of the present utility model and constitute a part of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0029] Figure 1 Schematic structural diagram of a single reaction chamber mechanical agitation clarifier according to the prior art;

[0030] Figure 2 is a sectional view of the mechanical agitation clarifier according to an embodiment of the present utility model;

[0031] Figure 3 is a top plan view of the upper layer of the mechanical agitation clarifier according to an embodiment of the present utility model;

[0032] Figure 4 is a bottom plan view of the mechanical agitation clarifier according to an embodiment of the present utility model; and

[0033] Figure 5 is a plan layout view of the pool body according to an embodiment of the present utility model.

[0034] In the figure: 1. Pool body; 2. Reaction chamber; 3. Agitator impeller; 4. Water inlet; 5. Water inlet pipe; 6. Sludge discharge pipe; 7. Water outlet pipe; 8. Installation bridge; 9. Dissolved air release device; 10. Scraper; 11. Slag discharge pipe; 12. Clear water collection pipe; 13. Total clear water collection pipe; 14. Dissolved air system; 15. Slag discharge trough; 16. Clear water collection trough. Detailed implementation manners

[0035] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0036] Now, various implementation manners of the present utility model will be described in detail. Examples of these implementation manners are shown in the drawings and described as follows. For the purpose of interpretation and precise definition in the appended claims, the terms "upper", "lower", "inner" and "outer" are used to describe the features with reference to the positions of the features in the exemplary implementation manners shown in the drawings.

[0037] Figure 2 The sectional view of a mechanical agitation clarifier according to an embodiment of the present utility model is shown. As Figure 2 shown, the mechanical agitation clarifier includes a pool body 1, a reaction chamber 2, an agitator impeller 3, a water inlet pipe 5, and a sludge discharge pipe 6, and further includes: a dissolved air system 14, located outside the pool body 1 and used for transporting pressurized dissolved air water; a dissolved air release device 9, located on the side wall of the reaction chamber 2 and used for receiving the pressurized dissolved air water transported from the dissolved air system 14 to release microbubbles; a slag discharge trough 15, located on the side wall of the pool body 1, the upper end of which is higher than the liquid level and used for collecting the fine particle adhesives adsorbed and floated out by the microbubbles; a slag discharge pipe 11, located on the side wall of the pool body 1 and lower than the slag discharge trough 15 and used for discharging the fine particle adhesives to complete the solid-liquid separation process.

[0038] In the related art, the traditional method of adding mixing and flocculation before the air flotation pool has disadvantages such as low treatment efficiency, large floor area, excessive or insufficient chemical agent addition, and inconvenient operation and management. The present utility model proposes a process combining a clarifier and an air flotation pool, so that the clarification and air flotation processes are effectively combined, which can cope with various water qualities such as complex water quality and high-algae water, and solves the problems existing in the combination method of the existing mixing and flocculation and the air flotation pool.

[0039] Figure 3 、 Figure 4 The upper-layer plan view and the lower-layer plan view of a mechanical agitation clarifier according to an embodiment of the present utility model are shown. As Figure 3 、 Figure 4As shown in the figure, the mechanical agitation clarifier further includes: a clear water collection pipe 12 located at the bottom of the tank body 1 for collecting the treated clear water; a clear water collection main pipe 13 for collecting the clear water collected by the clear water collection pipe 12; a clear water collection tank 16 with its top level with the tank wall for collecting the clear water collected by the clear water collection main pipe 13; and a water outlet pipe 7 located on the side wall of the tank body 1 and lower than the clear water collection tank 16 for discharging the clear water. The mechanical agitation clarifier further includes a slag scraper 10 located at the top of the tank body 1 for scraping off the particulate adhesives floating with the microbubbles and sending them to the slag discharge tank 15 and the slag discharge pipe 11.

[0040] In the related art, the water treated by the air flotation process faces the problem of separating clear water and fine sludge. In the embodiments of the present invention, by installing a clear water collection tank and a slag discharge tank at the upper part of the tank body and setting the top height of the clear water collection tank to be level with the tank wall, the clear water can flow smoothly into the clear water collection tank without carrying sludge, and at the same time, the slag discharge tank can also smoothly collect the sludge, solving the problem of discharge after the water treatment process.

[0041] According to an embodiment of the present invention, the reaction chamber 2 is in an umbrella shape. The raw water and the muddy water are stirred and mixed at the bottom, rise to the top, and flow back to the bottom of the tank along the inner wall of the reaction chamber to enter the circulating flocculation. The mechanical agitation clarifier further includes a water inlet 4 located at the center of the bottom of the tank body 1. The water inlet pipe 5 sends the raw water to the water inlet 4 and then mixes upward with the muddy water in the tank. A sludge discharge trough is arranged around the water inlet 4, and the sludge discharge trough is connected to the sludge discharge pipe 6 to discharge the excess sludge. The mechanical agitation clarifier further includes an installation bridge 8 located above the tank body 1. The reaction chamber 2 and the agitator 3 are suspended and installed on the installation bridge 8.

[0042] In the related art, the single-reaction chamber mechanical agitation clarifier is divided into a reaction zone and a separation zone without combining the air flotation process. The present invention divides the mechanical agitation clarifier into a mixing flocculation clarification zone and an air flotation separation zone. The reaction chamber in the mixing flocculation clarification zone in the tank is set in an umbrella shape, so that the raw water and the muddy water are stirred and mixed at the bottom, lifted to the top, and flow back to the bottom of the tank along the inner wall of the reaction chamber to enter the circulating flocculation; and the mixing flocculation clarification and air flotation are integrated as a whole to realize a clarification air flotation tank capable of dealing with various water qualities, thereby improving the treatment efficiency and the adaptability to various water qualities.

[0043] Figure 5 Fig. shows the layout diagram of the tank body according to an embodiment of the present invention, as Figure 5 shown, the upper part of the tank body 1 is a square structure, and the bottom chamfer is a circular structure. The tank bodies 1 are arranged in groups and are rectangular as a whole; the positions and directions of the water inlet pipe 5, the water outlet pipe 7, and the sludge discharge pipe 6 are determined according to the requirements of the plane layout.

[0044] In the related art, since the pool body is mostly circular, it is more difficult to arrange when multiple pool bodies are arranged, and the floor area is relatively large. In the present utility model, by setting the shape of the pool body to be square at the top and round at the bottom, it is convenient to arrange, saves the floor area, is convenient for planar layout, improves the floor area utilization efficiency and the separation utilization area, simplifies the design and construction, and saves materials.

[0045] The above embodiments are merely examples given to clearly illustrate the present utility model, rather than limiting the implementation manners of the present utility model. For those skilled in the art, other different forms of changes or modifications can be made on the basis of the following description, and these various changes, modifications, substitutions and deformations derived from the principles and spirits of the present utility model still fall within the protection scope of the present utility model.

Claims

1. A mechanical stirring clarifier, comprising a tank body (1), a reaction chamber (2), an agitator impeller (3), a water inlet pipe (5), and a sludge discharge pipe (6), characterized in that: The reaction chamber (2) is umbrella-shaped, and the raw water and muddy water are stirred and mixed at the bottom, rise to the top, and flow back to the bottom of the pool along the inner wall of the reaction chamber to enter the circulation flocculation. The mechanical stirring clarification tank also includes: A water inlet (4) is located at the bottom center of the pool body (1), and the water inlet pipe (5) delivers the raw water to the water inlet (4) and then flows upward to mix with the muddy water in the pool; A mud discharge trough is arranged around the water inlet (4), and the mud discharge trough is connected to the mud discharge pipe (6) to discharge excess mud; A mounting bridge (8) located above the tank body (1), the reaction chamber (2) and the agitator impeller (3) being suspended and mounted in the middle of the mounting bridge (8); A dissolved air system (14), located outside the tank body (1), for conveying pressurized dissolved air water; A dissolved air releaser (9), located on a side wall of the reaction chamber (2), for receiving the pressurized dissolved air water delivered from the dissolved air system (14) to release microbubbles; A slag discharge trough (15), located on the side wall of the tank body (1), with its upper end above the liquid surface, for collecting fine particle adhesives adsorbed and floated by the microbubbles; A slag discharge pipe (11) is located on the side wall of the tank body (1) and is lower than the slag discharge trough (15), and is used to discharge the fine particles of adhesives to complete the solid-liquid separation process.

2. The mechanical stirring clarifier according to claim 1, characterized in that: Also includes: A clean water collection pipe (12), located at the bottom of the tank body (1), and used for collecting treated clean water; A clean water collecting main pipe (13), used for collecting the clean water collected by the clean water collecting pipe (12); A clean water collection trough (16), the top of which is flush with the pool wall, for collecting the clean water collected by the clean water collection main pipe (13); A water outlet pipe (7) is located on the side wall of the pool body (1) and is lower than the clean water collection tank (16) and is used to discharge clean water.

3. The mechanical stirring clarifier according to claim 1, characterized in that: It also includes a scraper (10) located at the top of the flotation separation zone and the surface of the tank body (1) and used to scrape off the particle adhesives that float up with the microbubbles and send them to the slag discharge trough and slag discharge pipe (11).

4. The mechanical stirring clarifier according to any one of claims 1 to 3, characterized in that: The upper part of the pool body (1) is a square structure, and the bottom corners are rounded to form a circular structure.

5. The mechanical stirring clarifier according to claim 2, characterized in that: The tank bodies (1) are arranged in groups and are rectangular in shape as a whole; the positions and directions of the water inlet pipe (5), the water outlet pipe (7) and the mud discharge pipe (6) are determined according to the requirements of the plane layout.

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