A stirred tank for high concentration phosphorus-containing wastewater treatment

Abstract

The utility model discloses a kind of stirring tanks for high-concentration phosphorus-containing wastewater treatment, including the base of being equipped with kettle body and the dosing agent system and wastewater inlet system located at both sides of kettle body, kettle body upper end is closed with kettle cover, kettle cover is equipped with dosing agent inlet pipe and wastewater inlet pipe respectively connected with dosing agent system and wastewater inlet system, kettle cover upper end is fixedly connected with driving motor, the output end of driving motor is connected with the stirring shaft of being equipped with several stirring blades in the shaft direction of being inserted into the inner cavity of kettle body, the part of dosing agent inlet pipe and wastewater inlet pipe extending to the inner cavity of kettle body is connected with fixing piece, fixing piece includes the impact feed bin of making dosing agent and wastewater mix impact and the fixed disc located at the lower end of impact feed bin, fixed disc lower part is fixedly connected with the grating of being encircled stirring shaft.The utility model can make wastewater and dosing agent evenly distribute in kettle body, ensure that reaction is fully carried out, grating can enhance fluid turbulence intensity, strengthen mass transfer rate, meet the requirement of efficient and stable dephosphorization.

Description

Technical Field

[0001] This utility model relates to the field of stirred tank technology, and in particular to a stirred tank for treating high-concentration phosphorus-containing wastewater. Background Technology

[0002] With the continuous development of the phosphate chemical industry, the pressure to treat high-concentration phosphorus-containing wastewater discharged by enterprises is increasing. As the main source of this type of wastewater, phosphate chemical enterprises need to achieve phosphorus removal standards through efficient chemical phosphorus removal processes. Currently, the industry generally adds reagents in stages according to the total phosphorus concentration level: quicklime is often used as a phosphorus removal agent for high-concentration phosphorus-containing wastewater, while polyaluminum chloride, ferrous sulfate, and other reagents are often selected for medium and low-concentration wastewater. These reagents can react with phosphate ions to form insoluble phosphate precipitates, and then phosphorus is removed through solid-liquid separation. The entire process is highly dependent on the mixing and reaction efficiency of the reagents and wastewater in the stirred tank.

[0003] However, existing stirred reactors still face two major technical bottlenecks when treating high-concentration phosphorus-containing wastewater from phosphate chemical enterprises, making it difficult to meet the requirements for efficient and stable phosphorus removal. (1) Existing stirred reactors mostly rely on a single stirring paddle to drive fluid mixing, lacking internal components to enhance mass transfer, resulting in low reaction efficiency and insufficient mixing. The reasons are as follows: on the one hand, during the stirring process, a "large-scale circulating flow" is easily formed, leading to "dead zones" where fluid stagnates and "short-circuit flows" where the reaction is not fully completed, causing some wastewater to be discharged without actually participating in the reaction, affecting the phosphorus removal effect; on the other hand, the stirring energy is concentrated in the paddle area, and the turbulence intensity is low and the mass transfer is slow in areas far away, making it difficult to improve the overall reaction efficiency. (2) When treating high-concentration phosphorus-containing wastewater, the dosage and density of reagents such as quicklime are large, and traditional reactors lack targeted dispersion structures, resulting in the reagents being prone to agglomeration and poor dispersion effect. This is because when the stirring is insufficient, the reagents are prone to quickly settle to the bottom of the reactor and form block agglomerates; even if the stirring intensity is sufficient, the uneven flow field often leads to local enrichment of reagent particles. Agglomeration reduces the effective reaction area of ​​the reagent, resulting in wasted dosage, increased costs, and reduced phosphorus removal rate. Utility Model Content

[0004] To address the technical problems of low reaction efficiency, insufficient mixing of wastewater and reagents, easy agglomeration of reagents, and poor reagent dispersion in existing stirred tanks, this utility model provides the following technical solution.

[0005] This utility model discloses a stirred tank for treating high-concentration phosphorus-containing wastewater, comprising a base on which a tank body is mounted, and a reagent inlet system and a wastewater inlet system located on both sides of the tank body. The upper end of the tank body is covered with a tank cover, which has a reagent inlet pipe and a wastewater inlet pipe respectively connected to the reagent inlet system and the wastewater inlet system. A drive motor is fixedly connected to the upper end of the tank cover, and the output end of the drive motor is connected to a stirring shaft with a plurality of stirring blades extending into the inner cavity of the tank body. The portions of the reagent inlet pipe and the wastewater inlet pipe extending into the inner cavity of the tank body are connected to fixing members, which include an impact feed bin for mixing and impacting the reagent and wastewater, and a fixing plate located at the lower end of the impact feed bin. A grid member surrounding the stirring shaft is fixedly connected to the lower part of the fixing plate.

[0006] As a further technical solution, the grating component includes a plurality of vertical grating plates distributed along the circumference of the vessel body and fixedly connected to the fixed disk.

[0007] As a further technical solution, the grating component includes a plurality of cylindrical grating plates that are fixedly connected to the fixed disk and distributed radially along the vessel body.

[0008] As a further technical solution, the grating component includes a plurality of disc-shaped grating plates distributed along the axial direction of the vessel body, and the disc-shaped grating plates are fixedly connected to the fixed disc by a fixing rod.

[0009] As a further technical solution, the reagent inlet pipe and the wastewater inlet pipe are arranged opposite to each other at their outlets within the impact feed hopper.

[0010] As a further technical solution, the stirring blades are three in number, each tilted at a different angle along the axis of the stirring shaft.

[0011] As a further technical solution, the grille is a mesh structure made of stainless steel.

[0012] The beneficial effects of this invention are as follows: An impact feed chamber is installed inside the stirred tank. High-concentration phosphorus-containing wastewater and phosphorus removal agent are injected at high speed through symmetrical agent inlet pipes and wastewater inlet pipes, respectively. The two fluids collide violently within the impact feed chamber, achieving rapid and preliminary uniform mixing. A grid is installed below the impact feed chamber, dividing the tank cavity into multiple parallel separation reaction units. This prevents unreacted agent particles from settling, ensures uniform agent distribution within each unit, maximizes the contact area between the agent and wastewater, and ensures a complete reaction. The stirring shaft has multiple stirring blades with different inclinations along its axial direction, increasing the stirring force and differentiating the flow velocity of fluids at different heights, thus improving mixing uniformity. Furthermore, the grid enhances fluid turbulence intensity; when fluid passes through the small holes of the grid, jetting, vortexing, and shearing effects are generated, enhancing the mass transfer rate and meeting the requirements for efficient and stable phosphorus removal. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the stirred tank for treating high-concentration phosphorus-containing wastewater according to this utility model; Figure 2 This is a cross-sectional schematic diagram of the stirred tank body of the present invention for treating high-concentration phosphorus-containing wastewater; Figure 3 This is a schematic diagram of the first embodiment of the grid component of the stirred tank for treating high-concentration phosphorus-containing wastewater according to this utility model; Figure 4 This is a schematic diagram of the second embodiment of the grid component of the stirred tank for treating high-concentration phosphorus-containing wastewater according to this utility model; Figure 5 This is a schematic diagram of the third embodiment of the grid component of the stirred tank for treating high-concentration phosphorus-containing wastewater according to this utility model; In the diagram: 1-Base; 2-Bottle body; 3-Bottle cover; 301-Reagent inlet pipe; 302-Wastewater inlet pipe; 4-Drive motor; 5-Agitator shaft; 6-Agitator blade; 7-Fixed component; 701-Impact feed hopper; 702-Fixed disc; 8-Grid component; 801-Vertical grid plate; 802-Cylindrical grid plate; 803-Disc grid plate; 804-Fixed rod; 9-Reagent inlet system; 10-Wastewater inlet system. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0015] In the description of this utility model, it should be understood that the terms "upper" and "lower" are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0016] like Figure 1As shown, this utility model discloses a stirred tank for treating high-concentration phosphorus-containing wastewater, comprising a base 1 on which a tank body 2 is mounted, and multiple support legs around the lower part of the base 1. A reagent inlet system 9 and a wastewater inlet system 10 are located on both sides of the tank body 2 on the upper part of the base 1. Both the reagent inlet system 9 and the wastewater inlet system 10 are equipped with independent booster pumps and flow meters, respectively used to periodically and quantitatively feed the reagents and wastewater into the tank body 2 for reaction. The upper end of the tank body 2 is covered with a tank cover 3, which is fixedly connected to a reagent inlet pipe 301 and a wastewater inlet pipe 302. The reagent inlet pipe 301 and the wastewater inlet pipe 302 are respectively connected to the reagent inlet system 9 and the wastewater inlet system 10, and the reagents and wastewater enter the tank body 2 through the reagent inlet pipe 301 and the wastewater inlet pipe 302.

[0017] like Figure 2 and Figure 3 As shown, in a preferred embodiment, a drive motor 4 is fixedly connected to the upper end of the vessel lid 3. The output end of the drive motor 4 is connected to a stirring shaft 5 extending into the inner cavity of the vessel body 2. The stirring shaft 5 has several stirring blades 6 arranged axially. In this embodiment, there are three stirring blades 6, which are evenly distributed along the axial direction of the stirring shaft 5, providing multi-directional stirring power along the axial direction of the vessel body 2. At the same time, the stirring blades 6 can be tilted at different angles along the axial direction of the stirring shaft 5, so that the fluid flow rate at different heights in the vessel body 2 is different, thereby improving the mixing uniformity of the reagent and the phosphorus-containing wastewater.

[0018] In a preferred embodiment, the portions of the reagent inlet pipe 301 and the wastewater inlet pipe 302 extending into the inner cavity of the vessel body 2 are connected to a fixing member 7. The fixing member 7 can be detachably connected to the vessel body 2 by bolts, and the fixing member 7 can also be connected and fixed to the vessel cover 3. This utility model does not impose any particular limitation on this. The fixing member 7 includes an impact feed chamber 701 that causes the reagent and wastewater to mix and impact. At this time, the outlets of the reagent inlet pipe 301 and the wastewater inlet pipe 302 are arranged opposite to each other in the impact feed chamber 701. High-concentration phosphorus-containing wastewater and phosphorus removal agent are injected at high speed through the symmetrical reagent inlet pipe 301 and wastewater inlet pipe 302, respectively. The two fluids collide violently in the impact feed chamber 701, quickly achieving preliminary uniform mixing. A fixed plate 702 is fixedly connected to the lower end of the impact feed hopper 701. A grid 8 surrounding the stirring shaft 5 is fixedly connected to the lower part of the fixed plate 702. The grid 8 is a mesh structure made of stainless steel. The grid 8 can divide the inner cavity of the vessel body 2 into multiple parallel separation reaction units, which can prevent unreacted reagent particles from settling, ensure that the reagent is evenly distributed in each unit, maximize the contact area between the reagent and the wastewater, and ensure that the reaction is fully carried out.

[0019] Furthermore, the addition of the grid element 8 creates localized jets, vortices, and intense shearing as fluid passes through its small openings, significantly enhancing turbulence. This increases the liquid velocity and disturbance on the solid particle surface during solid-liquid reactions, effectively reducing the boundary layer thickness and significantly improving mass transfer rates. The grid element 8 also effectively prevents solid sedimentation and solid-liquid stratification during wastewater and pharmaceutical reactions, ensuring uniform solid distribution in the liquid phase and maximizing the solid-liquid contact area. Similar to a static mixer, the grid element 8 dissipates the energy input from the stirring blades 6 more evenly throughout the entire vessel body 2, resulting in a more uniform energy distribution, reducing energy waste in ineffective large circulation flows, and improving energy utilization efficiency.

[0020] In a preferred embodiment, the grid member 8 includes a plurality of vertical grid plates 801 fixedly connected to the fixed disk 702. In this embodiment, there are six vertical grid plates 801, which are distributed around the periphery of the vessel body 2. This can prevent "large-scale circulating flow" from occurring in the area near the stirring shaft 5 and divide the inner cavity of the vessel body 2 into multiple parallel separation reaction units. This can prevent unreacted reagent particles from settling, ensure that the reagent is evenly distributed in each unit, maximize the contact area between the reagent and the wastewater, and ensure that the reaction proceeds fully.

[0021] like Figure 4 As shown, in a preferred embodiment, the grid member 8 includes a plurality of cylindrical grid plates 802 that are fixedly connected to the fixed disk 702 and distributed radially along the vessel body 2. In this embodiment, the cylindrical grid plates 802 are three layers. The design of the cylindrical grid plates 802 can also generate local jets, vortices and strong shearing effects when the fluid passes through the cylindrical grid plates 802, thereby improving the mixing reaction effect of the reagent and wastewater.

[0022] like Figure 5 As shown, in a preferred embodiment, the grid member 8 includes a plurality of disc-shaped grid plates 803 distributed along the axial direction of the vessel body 2. The disc-shaped grid plates 803 are fixedly connected to the fixed disk 702 by a fixing rod 804. Although the shearing effect of the disc-shaped grid plate 803 is less than that of the vertical grid plate 801 and the cylindrical grid plate 802, it can still generate local jets, vortices and strong shearing effects, thereby improving the mixing reaction effect of the reagent and wastewater.

[0023] The preferred embodiments and examples of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments and examples. Within the scope of knowledge possessed by those skilled in the art, various changes or equivalent substitutions can be made without departing from the concept of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A stirred tank for treating high-concentration phosphorus-containing wastewater, comprising a base (1) on which a tank body (2) is mounted, and a reagent inlet system (9) and a wastewater inlet system (10) located on both sides of the tank body (2), wherein a tank cover (3) is fitted on the upper end of the tank body (2), and the tank cover (3) is provided with a reagent inlet pipe (301) and a wastewater inlet pipe (302) respectively connected to the reagent inlet system (9) and the wastewater inlet system (10), characterized in that: The upper end of the lid (3) is fixedly connected to a drive motor (4), and the output end of the drive motor (4) is connected to a stirring shaft (5) with a plurality of stirring blades (6) extending into the inner cavity of the body (2). The portions of the drug inlet pipe (301) and the wastewater inlet pipe (302) extending into the inner cavity of the body (2) are connected to a fixing member (7). The fixing member (7) includes an impact feed chamber (701) for mixing and impacting the drug and wastewater, and a fixing plate (702) located at the lower end of the impact feed chamber (701). The lower part of the fixing plate (702) is fixedly connected to a grid member (8) surrounding the stirring shaft (5).

2. The stirred tank for treating high-concentration phosphorus-containing wastewater according to claim 1, characterized in that: The grid member (8) includes a plurality of vertical grid plates (801) that are fixedly connected to the fixed disk (702) and distributed circumferentially along the vessel body (2).

3. The stirred tank for treating high-concentration phosphorus-containing wastewater according to claim 1, characterized in that: The grid member (8) includes a plurality of cylindrical grid plates (802) that are radially distributed along the vessel body (2) and are fixedly connected to the fixed disk (702).

4. The stirred tank for treating high-concentration phosphorus-containing wastewater according to claim 1, characterized in that: The grating component (8) includes a plurality of disc-shaped grating plates (803) distributed along the axial direction of the vessel body (2), and the disc-shaped grating plates (803) are fixedly connected to the fixed disc (702) by a fixing rod (804).

5. The stirred tank for treating high-concentration phosphorus-containing wastewater according to claim 1, characterized in that: The drug inlet pipe (301) and the wastewater inlet pipe (302) are positioned opposite each other at their outlets within the impact feed hopper (701).

6. The stirred tank for treating high-concentration phosphorus-containing wastewater according to claim 1, characterized in that: There are three stirring blades (6), which are tilted at different angles along the axis of the stirring shaft (5).

7. The stirred tank for treating high-concentration phosphorus-containing wastewater according to claim 1, characterized in that: The grating (8) is a mesh structure made of stainless steel.

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