Coagulation reaction device

Abstract

The utility model relates to the technical field of sewage treatment, and discloses a coagulation reaction device. The coagulation reaction device comprises: a box body, a grid assembly, a stirring device, a dosing device, a first sludge return pipe and a second sludge return pipe. A mixing tank, a flocculation tank and a pre-sedimentation tank are arranged in the box body; the grid assembly is arranged in the mixing tank; the stirring device is arranged in the flocculation tank; the dosing device is used to add flocculation agents to the mixing tank and the flocculation tank; the first sludge return pipe is connected to the mixing tank, and is used to transport the sludge after sedimentation and separation to the mixing tank; the second sludge return pipe is connected to the flocculation tank, and is used to transport the sludge to the flocculation tank. The grid assembly is a porous structure, which can mix the sewage flowing through, so that the sewage and the flocculation agent are more fully in contact, and the coagulation effect is better. The coagulation reaction device of the utility model has the advantages of low investment cost, low operating energy consumption, and saving flocculation agents.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a coagulation reaction device. Background Art

[0002] Sewage generally refers to water discharged during production activities and runoff rainwater, etc., including domestic sewage, industrial wastewater, etc. In related technologies, a coagulation reactor is required to treat sewage. For small and medium-sized sewage treatment facilities, the coagulation reactor is generally equipped with a two-stage mechanical stirring device or a three-stage mechanical device, which not only has high equipment investment costs, but also has the problem of high operating energy consumption. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the utility model proposes a coagulation reaction device, which is provided with a grid assembly and refluxes the sludge, thereby reducing the cost of sewage treatment.

[0005] The coagulation reaction device of the embodiment of the utility model comprises: a box body, a grid assembly, a stirring device, a dosing device, a first sludge return pipe and a second sludge return pipe, wherein a mixing tank, a flocculation tank and a pre-sedimentation tank are arranged in the box body, the mixing tank is connected with a water inlet pipe, the water inlet pipe is used to transport sewage to the mixing tank, the pre-sedimentation tank is connected with a drain pipe, the mixing tank is communicated with the flocculation tank, and the flocculation tank is communicated with the pre-sedimentation tank; the grid assembly is arranged in the mixing tank and the grid assembly is located at the lower side of the water inlet pipe; the stirring device is arranged in the flocculation tank; the dosing device is used to add flocculating agent to the mixing tank and the flocculation tank; the first sludge return pipe is communicated with the mixing tank and is used to transport the sludge after sedimentation and separation to the mixing tank; the second sludge return pipe is communicated with the flocculation tank and is used to transport the sludge to the flocculation tank.

[0006] In the coagulation reaction device of the embodiment of the utility model, after the sewage enters the coagulation tank, it can flow through the grid assembly under the action of gravity. The grid assembly is a porous structure, which can mix the sewage flowing through, so that the sewage and the flocculation agent are in contact more fully, and the coagulation effect is better. Due to the setting of the grid assembly, the coagulation reaction device only needs to be equipped with a primary stirring device, which reduces the initial construction investment cost and the later operation energy consumption.

[0007] The first sludge return pipe and the second sludge return pipe can return the sludge after sedimentation and separation to the coagulation reaction device. After the sludge is mixed with sewage, the flocculation effect of suspended matter in the sewage can be improved, and the use of flocculation agents can be reduced, thereby reducing the cost of flocculation agents.

[0008] In some embodiments, the first sludge return pipe is connected to the lower portion of the mixing tank and is located at the lower side of the grid assembly.

[0009] In some embodiments, the coagulation reaction device includes a water pipe arranged in the flocculation tank, one end of the water pipe is connected to the bottom of the mixing tank, and the other end is connected to the flocculation tank, and the second sludge return pipe is connected to the water pipe.

[0010] In some embodiments, the coagulation reaction device includes a water distribution trough, which is arranged in the mixing tank and connected to the water inlet pipe, and the water distribution trough is used to disperse the sewage to the grid assembly.

[0011] In some embodiments, the grille assembly includes at least two layers of grille mesh panels, and the grille mesh panels are arranged at intervals.

[0012] In some embodiments, the grille assembly includes a first grille mesh plate, a second grille mesh plate and a third grille mesh plate arranged in sequence from top to bottom, and the mesh size relationship between the first grille mesh plate, the second grille mesh plate and the third grille mesh plate is: first grille mesh plate < second grille mesh plate < third grille mesh plate.

[0013] In some embodiments, the dosing device includes a first dosing pipe and a second dosing pipe, the first dosing pipe is connected to the water inlet pipe, and the second dosing pipe is connected to the water flow pipe.

[0014] In some embodiments, the flocculant includes PAC and PAM, the first dosing tube is used to add PAC, and the second dosing tube is used to add PAM.

[0015] In some embodiments, the coagulation reaction device includes a baffle and a guide tube, the baffle is arranged at the outlet of the water pipe, and the guide tube is arranged on the periphery of the stirring device and is located on the upper side of the baffle.

[0016] In some embodiments, the coagulation reaction device includes a perforated mud discharge pipe, which is arranged in the pre-sedimentation tank, and the perforated mud discharge pipe is used to discharge the sludge in the pre-sedimentation tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of the coagulation reaction device of the embodiment of the utility model.

[0018] Figure 2 It is a top view of the coagulation reaction device of an embodiment of the utility model.

[0019] Reference numerals:

[0020] 1. Box body; 11. Mixing tank; 111. Water inlet pipe; 12. Flocculation tank; 121. Water pipe; 13. Pre-sedimentation tank; 131. Water passage; 132. Drain pipe; 133. Perforated sludge discharge pipe; 2. Grid assembly; 21. First grid mesh plate; 22. Second grid mesh plate; 23. Third grid mesh plate; 3. Stirring device; 4. Dosing device; 41. First dosing pipe; 42. Second dosing pipe; 5. First sludge return pipe; 6. Second sludge return pipe; 7. Water distribution trough; 8. Baffle plate; 9. Guide tube. DETAILED DESCRIPTION

[0021] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0022] like Figure 1 , 2 As shown, the coagulation reaction device of the embodiment of the utility model includes a box body 1, a grid assembly 2, a stirring device 3, a dosing device 4, a first sludge return pipe 5 and a second sludge return pipe 6.

[0023] The box 1 is provided with a mixing tank 11, a flocculation tank 12 and a pre-sedimentation tank 13. The mixing tank 11 is connected to an inlet pipe 111 for conveying sewage to the mixing tank 11. The pre-sedimentation tank 13 is connected to a drain pipe 132. The mixing tank 11 is connected to the flocculation tank 12, and the flocculation tank 12 is connected to the pre-sedimentation tank 13. Specifically, the box 1 may be made of steel. The bottom of the mixing tank 11 is connected to the bottom of the flocculation tank 12 through a water pipe 121, and the bottom of the flocculation tank 12 is connected to the bottom of the pre-sedimentation tank 13 through a water channel 131. Sewage flows into the coagulation reaction device from the inlet pipe 111, flows out through the drain pipe 132 after coagulation treatment, and the outflowing sewage enters the sedimentation tank to precipitate and separate the sludge.

[0024] The grid assembly 2 is arranged in the mixing tank 11 and the grid assembly 2 is located at the lower side of the water inlet pipe 111; the stirring device 3 is arranged in the flocculation tank 12; the dosing device 4 is used to add flocculation agents to the mixing tank 11 and the flocculation tank 12; the first sludge return pipe 5 is connected to the mixing tank 11, and is used to transport the sludge after sedimentation and separation to the mixing tank 11; the second sludge return pipe 6 is connected to the flocculation tank 12, and is used to transport the sludge to the flocculation tank 12.

[0025] Specifically, the grid assembly 2 can be a grid mesh plate made of fiberglass, and the grid mesh plate can be provided with multiple layers. The flocculating agent is added to the sewage at the water inlet pipe 111, and the multi-layer grid mesh plate has a preliminary mixing effect on the sewage flowing through, so that the sewage and the flocculating agent are in more sufficient contact, and the flocculation effect of the suspended matter in the sewage is better. The sewage after preliminary mixing enters the flocculation tank 12, and the stirring device 3 further increases the contact between the sewage and the flocculating agent, so that the suspended matter in the sewage is fully flocculated. Subsequently, the sewage and the flocculants enter the pre-sedimentation tank 13, in which a part of the flocculants settles into sludge, and the other part flows into the sedimentation tank through the drain pipe 132 and the sewage to continue sedimentation and separation.

[0026] In the coagulation reaction device of the embodiment of the utility model, after the sewage enters the coagulation tank, it can flow through the grid assembly under the action of gravity. The grid assembly is a porous structure, which can mix the sewage flowing through and increase the contact time between the sewage and the flocculation agent, so that the sewage and the flocculation agent are in contact more fully and the coagulation effect is better. Due to the setting of the grid assembly, the coagulation reaction device only needs to be provided with a primary stirring device, which reduces the initial construction investment cost and the later operation energy consumption.

[0027] The first sludge return pipe and the second sludge return pipe can return the sludge after sedimentation and separation to the coagulation reaction device. After the sludge and sewage are mixed, the flocculation effect of suspended matter in the sewage can be improved to form large-volume flocs, and the use of flocculants can be reduced, thereby reducing the cost of flocculants. Specifically, the first sludge return pipe can be activated or not according to the sewage flocculation effect on site.

[0028] In some embodiments, Figure 1 , 2 As shown, the first sludge return pipe 5 is connected to the lower part of the mixing tank 11 and is located at the lower side of the grid assembly 2. The coagulation reaction device includes a water pipe 121 arranged in the flocculation tank 12, one end of the water pipe 121 is connected to the bottom of the mixing tank 11, and the other end is connected to the flocculation tank 12, and the second sludge return pipe 6 is connected to the water pipe 121. The first sludge return pipe 5 and the second sludge return pipe 6 can return the sludge after sedimentation and separation to the coagulation reaction device. The sludge contains unreacted flocculants, which can improve the flocculation effect of suspended matter in sewage and reduce the use of flocculants.

[0029] In some embodiments, Figure 1 , 2 As shown, the coagulation reaction device includes a water distribution tank 7, which is arranged in the mixing tank 11 and connected to the water inlet pipe 111. The water distribution tank 7 is used to disperse the sewage to the grid assembly 2. The water distribution tank 7 can evenly disperse the sewage flowing out of the water inlet pipe 111 and drop it onto the grid assembly 2, so that the contact time between the sewage and the flocculation agent is longer and the coagulation effect is better.

[0030] In some embodiments, Figure 1 , 2 As shown, the grille assembly 2 includes a first grille mesh plate 21, a second grille mesh plate 22 and a third grille mesh plate 23 which are sequentially arranged from top to bottom, and the mesh size relationship of the first grille mesh plate 21, the second grille mesh plate 22 and the third grille mesh plate 23 is: the first grille mesh plate 21 < the second grille mesh plate 22 < the third grille mesh plate 23. Specifically, the first grille mesh plate 21 can be a glass fiber reinforced plastic grille mesh plate with a specification of 50 mm×50 mm; the second grille mesh plate 22 can be a glass fiber reinforced plastic grille mesh plate with a specification of 80 mm×80 mm; and the third mesh plate can be a glass fiber reinforced plastic grille mesh plate with a specification of 100 mm×100 mm.

[0031] In other embodiments, the number of grid mesh panels may also be two layers, four layers, five layers, etc.

[0032] In some embodiments, Figure 1 , 2 As shown, the dosing device 4 includes a first dosing pipe 41 and a second dosing pipe 42. The first dosing pipe 41 is connected to the water inlet pipe 111, and the second dosing pipe 42 is connected to the water flow pipe 121. The first dosing pipe 41 and the second dosing pipe 42 are used to add flocculating agents to the mixing tank 11 and the flocculation tank 12, respectively.

[0033] In some embodiments, Figure 1 , 2 As shown, the flocculating agents include PAC and PAM, the first dosing pipe 41 is used to add PAC, and the second dosing pipe 42 is used to add PAM. PAC is polyaluminium chloride, and PAM is polyacrylamide, both of which are flocculating agents used for sewage treatment.

[0034] In some embodiments, Figure 1 , 2 As shown, the coagulation reaction device includes a baffle plate 8 and a guide tube 9. The baffle plate 8 is arranged at the outlet of the water pipe 121, and the guide tube 9 is arranged on the outer periphery of the stirring device 3 and located on the upper side of the baffle plate 8.

[0035] The baffle plate 8 can reduce the flow rate of the sewage at the outlet of the water pipe 121, and prevent the sewage from directly rushing up into the guide tube 9. The stirring device 3 can achieve a better stirring and mixing effect. The stirring device 3 can be an upflow mixer, which can make the sewage flow upward and flow out from the upper outlet of the guide tube 9. The guide tube 9 increases the residence time of the sewage in the flocculation tank 12. The upflow mixer stirs the sewage more fully, and the sewage is in more sufficient contact with the flocculation agent, and the flocculation effect is better.

[0036] In some embodiments, Figure 1 , 2As shown, the coagulation reaction device includes a perforated mud discharge pipe 133, which is arranged in the pre-sedimentation tank 13, and the perforated mud discharge pipe 133 is used to discharge the sludge in the pre-sedimentation tank 13. Specifically, the perforated mud discharge pipe 133 is arranged at the bottom of the pre-sedimentation tank 13, and the bottom of the perforated mud discharge pipe 133 is provided with perforations arranged at intervals, and the sludge can be discharged through the perforations.

[0037] The working process of the coagulation reaction device in the embodiment of the utility model is described below.

[0038] The water inlet pipe 111 of the mixing tank 11 and the drainage pipe 132 of the pre-sedimentation tank 13 are connected respectively; the connection between PAC, PAM and the first dosing pipe 41 and the second dosing pipe 42 is completed; the connection between the first sludge return pipe 5 and the second sludge return pipe 6 and the on-site sedimentation tank is completed; the connection between the perforated sludge discharge pipe 133 and the on-site sludge tank is completed.

[0039] Start the upflow mixer, and the sewage is transported to the coagulation reaction device through the lifting pump. In this process, PAC and PAM flocculants are added. After the reaction between the sludge return and the flocculant forms a large volume of flocs, it flows into the on-site sedimentation tank by gravity, completing the entire coagulation reaction. The remaining sludge can be discharged to the on-site sludge tank through the perforated sludge discharge pipe 133.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0044] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0045] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A coagulation reaction device, characterized in that: include: A box body, wherein a mixing tank, a flocculation tank and a pre-sedimentation tank are arranged in the box body, the mixing tank is connected to a water inlet pipe, the water inlet pipe is used to transport sewage to the mixing tank, the pre-sedimentation tank is connected to a drain pipe, the mixing tank is connected to the flocculation tank, and the flocculation tank is connected to the pre-sedimentation tank; A grille assembly, the grille assembly is arranged in the mixing tank and the grille assembly is located at the lower side of the water inlet pipe; A stirring device, wherein the stirring device is arranged in the flocculation tank; A dosing device, the dosing device is used to add flocculation agents to the mixing tank and the flocculation tank; a first sludge return pipe, which is connected to the mixing tank and is used to transport the sludge after sedimentation and separation to the mixing tank; A second sludge return pipe is connected to the flocculation tank and is used to transport the sludge to the flocculation tank.

2. The coagulation reaction device according to claim 1, characterized in that: The first sludge return pipe is connected to the lower part of the mixing tank and is located at the lower side of the grid assembly.

3. The coagulation reaction device according to claim 2, characterized in that: It comprises a water pipe arranged in the flocculation tank, one end of the water pipe is connected with the bottom of the mixing tank, and the other end is connected with the flocculation tank, and the second sludge return pipe is connected with the water pipe.

4. The coagulation reaction device according to claim 1, characterized in that: It comprises a water distribution trough, which is arranged in the mixing tank and communicated with the water inlet pipe, and is used for dispersing the sewage to the grille assembly.

5. The coagulation reaction device according to claim 1, characterized in that: The grille assembly includes at least two layers of grille mesh panels, and the grille mesh panels are arranged at intervals.

6. The coagulation reaction device according to claim 5, characterized in that: The grille assembly includes a first grille mesh plate, a second grille mesh plate and a third grille mesh plate arranged in sequence from top to bottom, and the mesh size relationship between the first grille mesh plate, the second grille mesh plate and the third grille mesh plate is: first grille mesh plate < second grille mesh plate < third grille mesh plate.

7. The coagulation reaction device according to claim 3, characterized in that: The dosing device comprises a first dosing pipe and a second dosing pipe, wherein the first dosing pipe is connected to the water inlet pipe, and the second dosing pipe is connected to the water flow pipe.

8. The coagulation reaction device according to claim 7, characterized in that: The flocculant includes PAC and PAM. The first dosing pipe is used for adding PAC, and the second dosing pipe is used for adding PAM.

9. The coagulation reaction device according to claim 3, characterized in that: It comprises a baffle plate and a guide tube, wherein the baffle plate is arranged at the outlet of the water pipe, and the guide tube is arranged on the outer periphery of the stirring device and located on the upper side of the baffle plate.

10. The coagulation reaction device according to any one of claims 1 to 9, characterized in that: It comprises a perforated mud discharge pipe, which is arranged in the pre-sedimentation tank and is used to discharge the sludge in the pre-sedimentation tank.

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