A method of sludge flocculation and chemical conditioning concentration

Abstract

The present application relates to sludge flocculation and medicament conditioning concentration method, it includes: S1, stirring concentration step, mud is agitated by first stirring unit, wherein the mud water generated by agitation is filtered to filter water cavity, and the stirred sludge is pushed down; S2, step-by-step medicament concentration step, by adding medicament to multiple dosing pipes from top to bottom in turn, and completing the stirring of each level formed below the corresponding dosing pipe, and the sludge after completing multistage stirring is discharged from the mud outlet structure, wherein the flow direction of the medicament of the two adjacent dosing pipes is kept intersecting, and the stirring mode of the sludge formed by the two adjacent levels is different. The present application not only completes the uniform mixing of the medicament and the sludge in the relative dispersion in the diversified stirring process to destroy the cell wall of the sludge, but also can realize the multi-angle and omnidirectional mixing of the medicament and the sludge, and the mud discharge efficiency is high.

Description

Technical Field

[0001] This invention belongs to the field of sludge treatment equipment, specifically relating to a sludge flocculation and chemical conditioning concentration method. Background Technology

[0002] For sludge treatment, the process generally involves first thickening the sludge and adding chemicals (such as flocculants and conditioners) to break down the cell walls of the sludge, which facilitates effluent discharge. Then, the thickened sludge is conveyed from the sludge outlet to the extrusion channel for extrusion and dewatering. Therefore, the effectiveness of sludge thickening directly affects the subsequent dewatering rate.

[0003] Currently, the concentration devices used above are generally vertical, and include a vertical concentration cylinder, a filter cylinder, a stirring structure, and a sludge discharge structure. The concentration cylinder has a sludge inlet channel at the top and a sludge outlet channel at the bottom. A filtration zone is formed between the concentration cylinder and the filter cylinder. The stirring structure is located inside the filter cylinder and forms a concentration zone. During the stirring of the stirring structure (and with the assistance of chemicals for water discharge), the sludge is concentrated and moves downward. The concentrated and separated sludge-water is filtered from the filter cylinder to the filtration zone, and the concentrated and separated sludge moves to the sludge outlet channel formed by the sludge discharge structure.

[0004] However, practical operation has revealed the following technical problems with the aforementioned concentration device:

[0005] 1) Because the stirring structure creates a single direction of stirring motion (without any change), the agent and sludge are not mixed sufficiently, and the effluent rate of flocculation and concentration cannot reach the optimal level. That is, the cell walls of the sludge cannot be optimally broken down to form a high effluent rate. At the same time, the method and location of agent addition are also very important and directly affect the flocculation effect of the sludge.

[0006] 2) Driven by the stirring structure, the sludge detaches from the filter screen and flows downwards. It flows towards the sludge outlet channel under the mutual compression of the sludge itself. If the stirring structure is far from the sludge outlet channel, it is easy for the sludge in the separated mud and water to form a blockage at the sludge outlet channel, resulting in a low sludge discharge rate and thus affecting the thickening efficiency. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an improved method for sludge flocculation and chemical conditioning concentration.

[0008] To solve the above technical problems, the present invention adopts the following technical solution:

[0009] A sludge thickening method involving flocculation and chemical conditioning, employing a vertical sludge thickening device comprising a thickening cylinder, a filter screen cylinder fixedly installed inside the thickening cylinder with a filtration chamber formed between their inner and outer walls, a stirring structure, and a sludge discharge structure. The stirring structure includes a first stirring unit extending vertically and located inside the filter screen cylinder. The first stirring unit rotates around a vertical axis and is spirally attached to the inner wall of the filter screen cylinder. The stirring structure also includes multiple stages of stirring units located below the first stirring unit and spaced vertically within the thickening cylinder. The sludge thickening device further includes multiple dosing pipes extending from outside the thickening cylinder into the cylinder body and spaced vertically from top to bottom. Each stage of stirring unit corresponds to one dosing pipe, and the dosing pipes are located above each stage of stirring unit and extend into the thickening cylinder. The thickening method includes:

[0010] S1. Stirring and concentrating step: The first stirring unit stirs the sludge, and the mud water generated by stirring is filtered into the water filtration chamber. The stirred sludge is pushed downward.

[0011] S2, the step of progressively concentrated reagents, involves sequentially adding reagents to multiple dosing tubes from top to bottom, and completing the stirring of each stage below the corresponding dosing tube. The sludge after multi-stage stirring is discharged from the sludge discharge structure. The flow direction of the reagents in two adjacent dosing tubes is intersecting, and the sludge stirring methods formed by the two adjacent stages of stirring are different. The sludge stirring methods include dispersion stirring formed by stirring the sludge in the vertical direction and mixing stirring from the side to the center in the vertical direction.

[0012] In some specific embodiments, during S2, when each dosing pipe adds chemicals, the corresponding stirring unit below it agitates, while other stirring units remain stationary. That is, the multi-stage stirring units operate completely independently, and this design primarily considers ensuring that the chemicals sprayed from the dosing pipes are thoroughly mixed with the sludge. Furthermore, different chemicals are added to adjacent dosing pipes. Here, by adding different chemicals, the optimal disruption of the sludge cell walls is achieved, thereby improving the effluent rate of the sludge thickening process.

[0013] According to a specific embodiment and preferred aspect of the present invention, the multi-stage stirring unit includes a second stirring unit and a third stirring unit spaced vertically apart. The second stirring unit rotates about a vertical axis and agitates the sludge in the vertical direction to form a dispersive stirring motion, while the third stirring unit rotates about a horizontal direction and agitates the sludge from the sides to the center to form a mixed stirring motion in the vertical direction. The dosing pipe includes a first dosing pipe and a second dosing pipe with multiple dosing holes spaced apart along its length. The first dosing pipe is located above the second stirring unit, and the second dosing pipe is located above the third stirring unit. Here, through two-stage stirring, the movement direction of the sludge is changed, resulting in relatively uniform sludge concentration within the thickening cylinder.

[0014] Preferably, the first and second stirring units are coaxial and rotate synchronously. A flow channel is formed inside the spiral blades of the first stirring unit. During the downward transport of sludge, the sludge-water mixture generated by the compression within the sludge converges into the flow channel and flows upwards in the opposite direction of the spiral transport, eventually being filtered into the filtration chamber. This structural design simplifies the power output structure and, thanks to the dispersion created by the second stirring unit, facilitates the convergence of water within the sludge along the spiral blades into the flow channel for filtration into the filtration chamber.

[0015] According to another specific embodiment and preferred aspect of the invention, there are multiple first dosing pipes, spaced apart around the stirring shaft of the second stirring unit. Preferably, there are four, five, or six (or more) first dosing pipes, which can simultaneously and synchronously introduce the agent into the sludge, thereby achieving a more uniform mixing of the sludge and the agent. Further, there are four first dosing pipes arranged in a cross shape, with the stirring shaft of the second stirring unit passing through the center of the cross. Simultaneously, the dosing holes on the four first dosing pipes are arranged in a ring around the center of the stirring shaft, with the diameters of the multiple rings varying in an arithmetic sequence. Here, the spaced distribution of the dosing holes effectively divides the dosing area, especially since the formed dosing area is ring-shaped and fully covers the radial direction of the lower cylinder, ensuring relatively uniform mixing of the agent with the sludge.

[0016] Preferably, each first dosing tube is formed by cutting along its length from the upper and lower sides of the cylindrical tube to create a cut surface. Each dosing hole extends vertically inward from the end face of the cut surface and communicates with the internal cavity of the first dosing tube. Here, the cut surface design serves two purposes: firstly, as the sludge moves upward or downward along the cylindrical tube, some sludge will move tangentially, and a small amount of sludge will adhere to the cut surface as it moves up and down. Therefore, the agent sprayed from the dosing hole easily disperses the sludge adhering to the cut surface to form a dispersion gap, meaning the agent can more effectively disperse and mix with the sludge. Secondly, the cut surface design facilitates the forming and processing of the dosing holes (and also reduces the probability of the dosing holes becoming clogged).

[0017] In some specific embodiments, the cutting surface is a plane aligned vertically or a concave surface recessed inward from both the top and bottom sides. Considering the aforementioned dispersion and mixing effect, theoretically, a concave surface would be better (but it would trap mud and be inconvenient to clean). However, a plane cutting surface is more convenient for practical use.

[0018] In some specific embodiments, a cutting surface is distributed corresponding to the dosing zone formed between each pair of adjacent first dosing tubes. This design enables better drug mixing. During dosing, the drug is introduced from the outer end of each first dosing tube and sprayed out from the dosing hole under pressure. The sprayed drug disperses the sludge in contact with the cutting surface to form dispersion gaps. The drug diffuses circumferentially along the dispersion gaps and mixes with the dispersed sludge above and below.

[0019] According to another specific embodiment and preferred aspect of the invention, the second dosing tube is located above the stirring center formed by the third stirring unit, and the second dosing tube is cut from the bottom of the cylindrical tube to form a cutting surface. Each of the dosing holes extends vertically upward from the cutting surface and communicates with the internal cavity of the second dosing tube. When dosing, the agent is introduced from the outer end of the second dosing tube and sprayed downward from the dosing hole under pressure. The sprayed agent disperses the sludge in contact with the cutting surface to form a dispersion gap. The agent diffuses circumferentially along the dispersion gap and mixes with the sludge agitated towards the center. The positional distribution of this dosing tube is important because the sludge agitated from both sides towards the center converges along both sides of the cylindrical tube towards the center. Therefore, the sludge below the cutting surface is relatively loose, which facilitates the agent sprayed from the dosing hole to easily disperse the sludge adhering to the cutting surface to form a dispersion gap. That is, the agent can be more effectively dispersed and mixed with the sludge. At the same time, the setting of the cutting surface is beneficial to the forming process of the dosing hole (in addition, it can reduce the probability of the dosing hole being blocked).

[0020] Preferably, the second dosing pipe is a straight pipe that runs through the center of the concentration cylinder and has its two ends protruding from opposite sides of the concentration cylinder. Both protruding ends of the second dosing pipe are dosing ends, and during dosing, the drug is simultaneously introduced from both dosing ends. Simultaneous dosing from both ends not only ensures thorough mixing of the drug before spraying, but also provides sufficient spray pressure to meet mixing requirements, further facilitating the self-dispersing diffusion of the drug across the surrounding interphase.

[0021] Furthermore, the third stirring unit includes two sets of stirring blades that stir synchronously and in opposite directions, forming two annular stirring zones. The two annular stirring zones intersect and are horizontally aligned. The centerline of the dosing hole coincides with the line connecting the upper and lower intersection points of the intersecting area formed by the two annular stirring zones. This arrangement is more conducive to the mixing of the agent in the vertical direction.

[0022] Preferably, each agitator in the third agitation unit includes an agitation shaft and multiple agitator blades spaced apart along the length of the agitation shaft. The two agitation shafts are parallel and aligned left and right with respect to the second dosing pipe, and the agitator blades of the two sets of agitators are relatively staggered. This not only achieves the mixing effect but also helps to improve the sludge discharge efficiency.

[0023] Preferably, in the axial projection along the stirring shaft, the stirring blades are arranged in a cross shape and form an annular stirring zone, with the two annular stirring zones of the two sets of stirring blades intersecting.

[0024] Furthermore, the second mixing unit includes a mixing shaft that moves coaxially and synchronously with the first mixing unit, and multiple mixing blades that extend radially along the mixing shaft and are inclined vertically. Some of the mixing blades are inclined inwards, and some are inclined outwards, forming upper and lower dispersion blades in the vertical direction. Therefore, the first and second mixing units share a single power unit, and the mixing of the reagent and sludge is better achieved during the vertical movement of the sludge.

[0025] Preferably, the upper and lower dispersing blades have the same structure, each including four stirring blades arranged in a cross shape along the center line. Two stirring blades located along the same center line intersect, allowing the upward and downward moving sludge to be relatively displaced and dispersed. This not only effectively mixes the sludge and the reagent but also delays the downward flow of the sludge, thus improving the mixing quality. In some specific embodiments, two stirring blades located along the same center line form a blade group, and the two blade groups are staggered vertically.

[0026] Due to the implementation of the above technical solutions, the present invention has the following advantages compared with the prior art:

[0027] Existing sludge thickening devices cannot simultaneously meet the requirements of diversified stirring, thorough mixing of chemicals and sludge to break down sludge cell walls, high concentration water output rate, and high sludge discharge efficiency. This application cleverly solves the various shortcomings of existing structures by designing the overall structure of the thickening device. In this device, after the sludge enters the thickening zone, it is first separated into mud and water by the stirring of the spiral blades. The sludge is pushed downwards, and the mud and water are filtered into the filtration chamber. Then, the chemicals are added in stages, and the sludge and chemicals are mixed in different directions of movement through the corresponding stirring stages. This breaks down the cell walls of the sludge and improves the effluent rate of the sludge thickening. Therefore, compared with the existing structure, the thickening device of this application can not only implement diversified stirring, but also achieve uniform mixing of chemicals and sludge in a relatively dispersed manner during the stirring process. This is very beneficial for the chemicals to break down the cell walls of the sludge and improve the effluent rate of the sludge thickening. On the other hand, by intersecting the direction of chemical injection and intersecting or being the same as the direction of sludge movement in the corresponding zone, the chemicals and sludge can be mixed from multiple angles and in all directions. Thirdly, the multi-stage stirring setting can also effectively increase the sludge discharge efficiency. Attached Figure Description

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0029] Figure 1This is a schematic diagram of the vertical sludge thickening device of the present invention;

[0030] Figure 2 for Figure 1 A half-section view;

[0031] Figure 3 for Figure 1 Schematic diagram of the sectional view along the central AA direction;

[0032] Figure 4 This is a front view schematic diagram of a single first dosing tube of the present invention;

[0033] Figure 5 for Figure 4 Schematic diagram of the BB-direction section;

[0034] Figure 6 This is a front view schematic diagram of the second dosing tube of the present invention (partially omitted);

[0035] Figure 7 for Figure 6 Schematic diagram of cross-section along the CC direction;

[0036] Wherein: 1. Concentrator; 10. Upper cylinder; 11. Lower cylinder; 111. First straight cylinder; 112. Conical cylinder; 113. Second straight cylinder;

[0037] 2. Filter screen cylinder; Q. Filter chamber;

[0038] 3. Stirring structure; 31. First stirring unit; 310. Stirring shaft; 311. Spiral blade; 32. Second stirring unit; 320. Stirring shaft; 321. Stirring blade; a. Upper dispersion blade; b. Lower dispersion blade; 33. Third stirring unit; 330. Stirring paddle; s1. Stirring shaft; s2. Stirring blade;

[0039] 4. Mud discharge structure;

[0040] 5. First dosing tube; 50. Dosing hole; 5a. Cutting surface;

[0041] 6. Second dosing pipe; 60. Dosing hole; 6a. Cutting surface; h. Annular stirring zone. Detailed Implementation

[0042] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0043] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] In this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0047] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0048] like Figures 1 to 3As shown, the sludge flocculation and chemical conditioning concentration method of this embodiment uses a vertical sludge concentration device including a concentration cylinder 1, a filter cylinder 2, a stirring structure 3, a sludge discharge structure 4, a first dosing pipe 5, and a second dosing pipe 6. The concentration cylinder 1 is arranged vertically and includes an upper cylinder 10 and a lower cylinder 11. The filter cylinder 2 is located inside the upper cylinder 10, and a filtration chamber Q is formed between the inner and outer walls of the two. The stirring structure 3 includes a first stirring unit 31, a second stirring unit 32, and a third stirring unit 33 distributed from top to bottom at intervals. The sludge discharge structure 4 is located on one side of the lower cylinder 11.

[0049] Specifically, the upper cylinder 10 is a cylindrical shape, the filter cylinder 2 and the upper cylinder 10 are concentrically arranged, and the lower cylinder 11 includes, from top to bottom, a first straight cylinder 111, a cone cylinder 112 with a gradually decreasing inner diameter, and a second straight cylinder 113 extending vertically downward from the bottom of the cone cylinder 112. The first stirring unit 31 is installed inside the filter cylinder 2, the second stirring unit 32 is located inside the first straight cylinder 111, and the upper part of the third stirring unit 32 is located inside the cone cylinder 112 and the lower part is located inside the second straight cylinder 113.

[0050] In this example, the first stirring unit 31 includes a stirring shaft 310 extending in the vertical direction and a plurality of spiral blades 311 spirally wound on the stirring shaft 310. The circumferential surface formed by the plurality of spiral blades 311 is in contact with the inner wall of the filter screen cylinder 2, and a flow channel hole is formed at the connection between the plurality of spiral blades 311 and the stirring shaft 310. During stirring, the water inside the sludge can converge into the flow channel hole and also surge upward in contact with the stirring shaft 310 of the first stirring unit 31, and then be discharged into the water filtration chamber Q. The second stirring unit 32 rotates around a vertical axis and agitates the sludge in the vertical direction to form a dispersion stirring. Specifically, the second stirring unit 32 includes a stirring shaft 320 that is coaxial with and moves synchronously with the first stirring unit 31, and multiple stirring blades 321 that extend radially along the stirring shaft 320 and are inclined vertically. Some of the multiple stirring blades 321 are inclined inward and some are inclined outward, and they form an upper dispersion blade a and a lower dispersion blade b in the vertical direction. In this example, both the upper dispersion blade a and the lower dispersion blade b are single groups, and the upper dispersion blade a and the lower dispersion blade b have the same structure, each including four stirring blades 321 arranged in a cross shape along the center line. Two stirring blades 321 located in the same center line direction intersect, and two stirring blades 321 located in the same center line direction form a blade group. The two blade groups are staggered vertically, thus forming a multi-layer dispersion stirring in the vertical direction. The third mixing unit 33 rotates around the horizontal direction and stirs the sludge from the side to the center to form a vertical mixing. Specifically, the third mixing unit 33 includes two sets of mixing blades 330 that are synchronously and opposite to each other. Each mixing blade 330 includes a mixing shaft s1 and multiple mixing blades s2 that are spaced apart along the length of the mixing shaft s1. The two mixing shafts s1 are parallel and aligned left and right. The mixing blades s2 of the two sets of mixing blades 330 are relatively staggered. In the axial projection along the mixing shaft s1, the mixing blades s2 are arranged in a cross shape and form an annular mixing zone. The two annular mixing zones of the two sets of mixing blades intersect.

[0051] In this example, the mud discharge structure 4 is specifically described in ZL201921320400.5. The first dosing pipe 5 and the second dosing pipe 6 are inserted into the lower cylinder 11 from the outside of the lower cylinder 11.

[0052] Specifically, the first dosing tube 5 is located below the first stirring unit 31 and above the second stirring unit 32. In this example, there are four first dosing tubes 5, and the four first dosing tubes 5 are arranged in a cross shape. The center of the cross can be passed through the stirring shaft 320 of the second stirring unit 32. The outer end of each first dosing tube 5 extends out from the outside of the lower cylinder 11 to form a dosing end, and the inner end is closed. Each first dosing tube 5 has multiple dosing holes 50 arranged side by side along its own length direction. The dosing holes 50 on the four first dosing tubes 5 are arranged in a ring with the center of the stirring shaft 320 as the center. The diameter of the multiple rings changes in an arithmetic sequence.

[0053] Combination Figure 1 , 3 As shown in Figures 4 and 5, each first dosing tube 5 is formed by cutting along its length from the upper and lower sides of the cylindrical tube to create a cutting surface 5a. Each dosing hole 50 extends vertically inward from the end face of the cutting surface 5a and communicates with the internal cavity of the first dosing tube 5. In some specific embodiments, the cutting surface 5a is a plane aligned vertically, and a cutting surface 5a is distributed correspondingly in the dosing area formed between each pair of adjacent first dosing tubes 5.

[0054] Combination Figure 1 , 2 As shown in Figures 6 and 7, the second dosing tube 6 is a single tube that runs horizontally through the middle of the conical tube 112. In this example, the second dosing tube 6 is located above the stirring center formed by the third stirring unit 33. The second dosing tube 6 is cut from the bottom of the cylindrical tube to form a cutting surface 6a. The cutting surface 6a faces downward and is located below the top of the third stirring unit 33. Each dosing hole 60 extends vertically upward from the cutting surface and communicates with the internal cavity of the second dosing tube 6.

[0055] Furthermore, the cutting surface 6a is set horizontally, and the center line of the dosing hole 60 coincides with the line connecting the upper and lower intersection points of the intersecting area formed by the two annular mixing zones h of the two sets of agitators 330. At the same time, the cutting surface 6a is located between the top of the annular mixing zone and the upper intersection point.

[0056] In addition, to further achieve the best mixing effect of the agents, different agents are added to the first dosing tube 5 and the second dosing tube 6. Moreover, the direction of the agent sprayed from the first dosing tube 5 is perpendicular to the direction of the agent sprayed from the second dosing tube 6. That is, the sprayed agent is perpendicular or parallel to the direction of sludge movement, which can fully mix the agent and sludge from multiple angles and in all directions to achieve the best effect of destroying the sludge cell wall.

[0057] In summary, the implementation process of this embodiment is as follows:

[0058] S1. Stirring and concentration step, in which the first stirring unit 31 stirs the sludge, wherein the mud water produced by stirring is filtered into the water filtration chamber Q, the stirred sludge is pushed downward, and at the same time, the water inside the sludge can converge into the flow channel hole and also surge upward along the stirring shaft 310 of the first stirring unit 31, and then be discharged into the water filtration chamber Q.

[0059] S2, the stepwise concentration of the agent: First, the agent is added into the first dosing pipe 5. At this time, the first stirring unit 31 and the second stirring unit 32 are stirring synchronously. The agent sprayed from the dosing hole 50 of the first dosing pipe 5 disperses the sludge in contact with the cutting surface 5a to form a dispersion gap. The agent diffuses circumferentially along the dispersion gap and mixes with the sludge being stirred towards the center. Then, the agent is added to both dosing ends of the second dosing pipe 6 at the same time. The agent sprayed from the dosing hole 60 at the bottom of the second dosing pipe 6 disperses the sludge in contact with the cutting surface 6a to form a dispersion gap. The agent diffuses circumferentially along the dispersion gap and mixes with the sludge being stirred towards the center. Then, the sludge that has completed the two agent mixing processes is discharged from the sludge discharge channel.

[0060] It should be noted that the two dosing agents are different, and during the second dosing and stirring process, the first stirring unit 31 and the second stirring unit 32 can be stopped. At this time, it is beneficial to fully mix the second agent with the sludge and further increase the concentration effluent rate.

[0061] As can be seen from the above, with this device, after the sludge enters the thickening zone, it is first separated into mud and water by the stirring of the spiral blades. The sludge is pushed downwards, and the mud and water are filtered into the filtration chamber. Then, the agent is added, and the agent is mixed with the sludge by the up-and-down mixing formed by the second stirring unit. Then, the agent is added again, and the mixture is stirred from the side to the center. The sludge with broken cell walls is discharged from the sludge discharge structure to complete the sludge thickening. Therefore, compared with the existing structure, the thickening device of this application can not only implement diversified stirring, but also achieve uniform mixing of the agent and sludge in a relatively dispersed state during the stirring process. This is very beneficial for the agent to break down the cell walls of the sludge, thereby improving the effluent rate of the thickened sludge. On the other hand, by intersecting the direction of the agent injection and intersecting or being the same as the direction of sludge movement in the corresponding zone, the agent and sludge can be mixed from multiple angles and in all directions. On the third hand, the multi-stage stirring is completely independent, and this design is mainly to ensure that the agent sprayed from the dosing pipe can be fully mixed with the sludge. At the same time, the agents added to the two adjacent dosing pipes are different, which can optimize the destruction of the sludge cell walls by the agent, thereby improving the effluent rate of sludge concentration. In addition, it can also effectively increase the sludge discharge efficiency. On the fourth hand, by setting the cutting surface of the dosing pipe itself, it is not only easier to form a dispersion gap when the agent is sprayed to facilitate the diffusion of the agent, but also to reduce the probability of the dosing hole being blocked.

[0062] The present invention has been described in detail above, with the aim of enabling those skilled in the art to understand and implement the invention. However, this description should not be construed as limiting the scope of protection of the invention. All equivalent changes or modifications made in accordance with the spirit and essence of the invention should be included within the scope of protection of the invention.

Claims

1. A sludge flocculation and medicament conditioning concentration method, a vertical sludge concentration device used in the method comprises a concentration cylinder, a filter screen cylinder fixedly installed in the concentration cylinder and forming a filter water cavity between the inner and outer walls of the concentration cylinder and the filter screen cylinder, a stirring structure, and a sludge outlet structure, the stirring structure comprises a first stirring unit extending upward and downward and located inside the filter screen cylinder, the first stirring unit rotates around a vertical axis and is in a spiral blade type relative to the inner wall of the filter screen cylinder, characterized in that, The stirring structure further comprises multiple-stage stirring units arranged in the thickening cylinder in sequence from top to bottom below the first stirring unit, the multiple-stage stirring units comprising a second stirring unit and a third stirring unit arranged in sequence from top to bottom, wherein the second stirring unit rotates around a vertical axis and stirs the sludge in the up-down direction to form dispersion stirring, the third stirring unit rotates around a horizontal direction and stirs the sludge from the side to the center to form up-down direction mixing stirring, and the third stirring unit comprises two groups of stirring paddles that stir synchronously and oppositely, the two groups of stirring paddles forming two annular stirring zones arranged intersectingly. The sludge thickening device further comprises multiple dosing pipes arranged in the thickening cylinder in sequence from top to bottom, wherein each stage of stirring unit corresponds to one dosing pipe, and the dosing pipe is arranged above each stage of stirring unit and extends into the thickening cylinder, the dosing pipe comprising a first dosing pipe and a second dosing pipe with multiple dosing holes arranged in sequence along the length direction of the dosing pipe, each first dosing pipe forms a cutting surface by cutting the upper and lower sides of the cylindrical pipe along the length direction, the cutting surface being a plane aligned from top to bottom or a concave surface recessed inward from the upper and lower sides, and each dosing hole extends vertically inward from the end surface of the cutting surface and communicates with the internal cavity of the first dosing pipe. S1, a stirring and thickening step, wherein the first stirring unit stirs the sludge, and the mud-water generated by the stirring is filtered into the filter chamber, and the stirred sludge is pushed downward; 2. The process for sludge flocculation and chemical conditioning concentration according to claim 1, characterized in that: S2, a step of gradually adding reagents to multiple dosing pipes in sequence from top to bottom, and completing the stirring of each stage of sludge formed below the corresponding dosing pipe, and discharging the sludge after multiple-stage stirring from the sludge outlet structure, wherein the flow directions of the reagents in the two adjacent dosing pipes from top to bottom intersect, and the stirring modes of the sludge formed by the two adjacent stages of stirring are different, the stirring modes of the sludge including dispersion stirring in the up-down direction and mixing stirring in the up-down direction from the side to the center.

3. The process of sludge flocculation and chemical conditioning concentration according to claim 1, characterized in that: In step S2, when each dosing pipe is dosed, the stirring unit below the dosing pipe is stirred, and the other stages of stirring units are in a static state.

4. The process of sludge flocculation and chemical conditioning concentration according to claim 1, characterized in that: In step S2, the reagents added by the two adjacent dosing pipes from top to bottom are different.

5. The process of sludge flocculation and chemical conditioning concentration according to claim 4, characterized in that: The first dosing pipe is arranged above the second stirring unit, and the second dosing pipe is arranged above the third stirring unit.

6. The process of sludge flocculation and chemical conditioning concentration according to claim 4, characterized in that: The first stirring unit and the second stirring unit are coaxially and synchronously connected, the inner side of the helical blade of the first stirring unit forms a flow channel, and in the downward transmission of the sludge, the mud-water generated by the internal extrusion of the sludge converges to the flow channel and flows to the top in the opposite direction of the helical transmission of the sludge, and then is filtered into the filter chamber.

7. The process of sludge flocculation and chemical conditioning concentration according to claim 6, characterized in that: The first dosing pipe has multiple roots and is arranged in sequence from top to bottom around the stirring shaft of the second stirring unit. The dosing holes on the multiple first dosing pipes are arranged in a ring shape with the center of the stirring shaft as the center, and the diameters between the multiple rings are arranged in an arithmetic progression.

8. The process of sludge flocculation and chemical conditioning concentration according to claim 7, characterized by: The first medicating pipes are four in number and are arranged in a cross shape, the stirring shaft of the second stirring unit passes through the center of the cross shape, and each medicating area formed between two adjacent first medicating pipes is provided with a cutting surface, when medicating, the medicament is fed from the outer end of each first medicating pipe and is sprayed from the medicating holes under the pushing of pressure, wherein the sprayed medicament disperses the sludge contacted by the cutting surface to form a dispersion gap, the medicament spreads along the circumference of the dispersion gap and mixes with the sludge dispersed upward and downward.

9. The process of sludge flocculation and chemical conditioning concentration according to claim 4, characterized in that: The second medicating pipe is located above the stirring center formed by the third stirring unit, and the second medicating pipe is cut from the bottom of the cylindrical pipe to form a cutting surface, each medicating hole vertically extends upward from the cutting surface and communicates with the inner cavity of the second medicating pipe, when medicating, the medicament is fed from the outer end of the second medicating pipe and is sprayed downward from the medicating holes under the pushing of pressure, wherein the sprayed medicament disperses the sludge contacted by the cutting surface to form a dispersion gap, the medicament spreads along the circumference of the dispersion gap and mixes with the sludge stirred to the middle.

10. The process of sludge flocculation and chemical conditioning concentration according to claim 9, characterized in that: The second medicating pipe is a straight pipe and transversely passes through the center of the thickening cylinder, and the two end portions of the straight pipe respectively protrude from the opposite sides of the thickening cylinder, wherein the protruding end portions of the second medicating pipe are both medicating ends, and medicament is fed from the two medicating ends simultaneously when medicating.

11. The process of sludge flocculation and chemical conditioning concentration according to claim 9 or 10, characterized in that: The cutting surface is horizontally arranged, and the center line of the medicating hole is relatively coincided with the line connecting the upper and lower intersection points of the intersection area formed by the two annular stirring areas.

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