Zero-emission high-efficiency sedimentation tank for recycling high-density reclaimed water

Abstract

The utility model discloses a high-density reclaimed water reuse zero-discharge high-efficiency sedimentation tank, which is used as a membrane pretreatment facility and is composed of a coagulation tank, a flocculation tank, a sedimentation tank and a water outlet tank, and the coagulation tank is used for destabilizing and gathering suspended particles through mechanical stirring and a PAC coagulant; the flocculation tank is divided into a high-speed tank area and a low-speed tank area by a guide cylinder, sludge backflow is adjusted according to the concentration of suspended solids in inlet water, concentration is accurately controlled, high-quality alumen ustum is rapidly generated, the sedimentation tank performs large-area slow sedimentation, and a conical circulating cylinder efficiently stores sludge and reasonably discharges the sludge; the sedimentation tank has the advantages of uniform water distribution, thorough removal of residual alumen ustum, automatic adaptation to the concentration of suspended solids in inlet water, intelligent optimization of dosing and operation modes, great reduction of the influence of SS, hardness and other impurities on the membrane, substantial improvement of the membrane treatment efficiency, prolongation of the service life, flexible and stable operation, high automation degree, effective reduction of the manual intervention cost, and realization of the large-scale production. And a reliable guarantee is provided for reuse of reclaimed water.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of water reuse treatment equipment, in particular to a high-density water reuse zero-discharge efficient sedimentation tank. BACKGROUND

[0002] In the process of water reuse, in order to reduce the influence of SS, hardness, total iron, silicon dioxide and other substances in the influent on the membrane, an efficient clarifying sedimentation tank is usually used as a membrane pretreatment facility. In the existing clarifying sedimentation tank, there are problems such as slow formation speed of alum flowers, low sedimentation efficiency, and insufficient intelligent adjustment of dosing, which result in poor treatment effect and affect the efficiency and service life of subsequent membrane treatment. SUMMARY

[0003] The utility model aims at solving one of the technical problems existing in the prior art.

[0004] The application provides a high-density water reuse zero-discharge efficient sedimentation tank, which comprises a coagulation tank, a flocculation tank, a sedimentation tank and a water outlet tank, the coagulation tank is communicated with the flocculation tank through a pipeline I, the flocculation tank is communicated with the sedimentation tank through a pipeline II, the top of the sedimentation tank is provided with an overflow weir, the overflow weir is communicated with the water outlet tank through a water outlet, and the water outlet tank is communicated with a water outlet pipe.

[0005] The coagulation tank comprises a plurality of reaction chambers connected in series, the first reaction chamber is used for water inlet, the last reaction chamber is communicated with the pipeline I, adjacent reaction chambers are communicated through reserved holes, and stirring devices are arranged in the reaction chambers.

[0006] The flocculation tank is provided with a flow guide cylinder, and the flow guide cylinder is provided with a stirring device.

[0007] The stirring device is a stirring shaft driven by a motor, the lower end of the stirring shaft is provided with a stirring impeller and extends into the reaction chamber or the flow guide cylinder.

[0008] The sedimentation tank is provided with a reflection plate, and the reflection plate is located between the pipeline II and the overflow weir.

[0009] The bottom of the sedimentation tank is provided with a plurality of conical cylinders, and the bottom of the sedimentation tank is provided with a plurality of sludge discharge pipes, one end of each sludge discharge pipe is bent downward and extends into the bottom of each conical cylinder, and the other end extends out of the sedimentation tank.

[0010] One end of the pipeline II located in the sedimentation tank is connected with an I-shaped pipe, the middle part of the I-shaped pipe is communicated with the pipeline II, and the other four ends are downwardly bent and aligned with the conical cylinders.

[0011] The utility model also comprises a walkway plate, which is erected on the top of the coagulation tank, the flocculation tank, the sedimentation tank and the water outlet tank, and one end is connected with a staircase.

[0012] The utility model has the advantages of the following:

[0013] The coagulation reaction tank adopts mechanical stirring combined with PAC coagulant to promote the rapid destabilization and aggregation of fine suspended particles and colloidal ions; the flocculation reaction tank is divided into fast and slow flocculation pool areas by a flow guide cylinder, and the axial flow impeller and the push flow cooperate to adjust the sludge backflow according to the suspended matter concentration of the influent, accurately control the suspended solid concentration, and quickly form large, dense and uniform alum flowers. Compared with the traditional sedimentation system, the formation speed and quality of alum flowers are significantly improved.

[0014] The sedimentation tank uses a larger area to slow down the sedimentation of alum flowers, avoiding breakage and vortex, and the conical circulating cylinder stores high-concentration sludge, and the layered design realizes efficient backflow of part of the sludge and reasonable discharge of the remaining sludge, and the concentration of the concentrated sludge is stabilized at 10-40 grams / liter, ensuring the efficiency and stability of sludge treatment.

[0015] The sedimentation tank ensures that the water flow has no short circuit by means of the carefully designed uniform water distribution structure, so that the remaining alum flowers are fully removed, and the effluent is transported to the subsequent treatment through the collection tank system, effectively ensuring the effluent quality, reducing the influence of SS, hardness, total iron, silicon dioxide and other substances in the influent on the membrane, improving the pretreatment effect and membrane treatment efficiency before water reuse, and prolonging the service life of the membrane.

[0016] The sludge backflow can be automatically adjusted according to the suspended matter concentration of the influent, realizing intelligent optimization of dosing and operation mode, having the ability to overtake, adapting to different water quality changes, enhancing the flexibility and stability of the sedimentation tank operation, reducing the cost of manual intervention, and improving the automation level and overall operation efficiency of the treatment system. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a top view of the high-density water reuse zero-discharge high-efficiency sedimentation tank in the embodiments of the present application (without a reflector plate);

[0018] Figure 2 is Figure 1 a sectional view in the A-A direction;

[0019] Figure 3 is Figure 1 a sectional view in the B-B direction;

[0020] Figure 4 is Figure 1 a sectional view in the C-C direction;

[0021] Figure 5 is Figure 1 a sectional view in the D-D direction;

[0022] Figure 6 is Figure 1 a sectional view in the E-E direction;

[0023] Figure 7This is a top view (without reflector) of a high-density, zero-discharge, high-efficiency sedimentation tank for wastewater reuse in an embodiment of this application.

[0024] Figure Labels

[0025] 1-Coagulation tank, 101-Reaction chamber, 102-Reserved hole, 2-Flocculation tank, 3-Sedimentation tank, 4-Effluent tank, 5-Pipe 1, 6-Pipe 2, 7-Overflow weir, 8-Outlet, 9-Outlet pipe, 10-Agitator, 111-Agitator shaft, 112-Agitator impeller, 11-Guide cylinder, 12-Reflector plate, 13-Conical cylinder, 14-Sludge discharge pipe, 15-I-beam pipe, 16-Walkway slab, 17-Staircase. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0027] The terms "first," "second," etc., used in the specification and claims of this application are used to classify similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects classified by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0028] The high-density, zero-discharge, high-efficiency sedimentation tank 3 for wastewater reuse provided in this application will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios.

[0029] Example 1:

[0030] like Figures 1 to 7 As shown in the embodiment of this application, a high-density, zero-discharge, high-efficiency sedimentation tank for reclaimed water includes a coagulation tank 1, a flocculation tank 2, a sedimentation tank 3, and an effluent tank 4. The coagulation tank 1 and the flocculation tank 2 are connected by a first pipe 5, and the flocculation tank 2 is connected to the sedimentation tank 3 by a second pipe 6. An overflow weir 7 is provided at the top of the sedimentation tank 3, and the overflow weir 7 is connected to the effluent tank 4 through an outlet 8. The effluent tank 4 is connected to an outlet pipe 9.

[0031] Due to the adoption of the above structure, the PAC coagulant dosing device is arranged in the coagulation tank 1, and the PAC coagulant is added into the coagulation tank 1 through the device; the coagulation tank 1 adopts the mechanical stirring mode, and specifically, the stirring device 10 is arranged in the coagulation tank 1, the stirring device 10 stirs the water in the tank, so that the fine suspended particles and colloidal ions in the water are destabilized, aggregated and coagulated to form micro-flocs under the action of the PAC coagulant, the micro-flocs are pushed out through the pipeline 5, and then enter the flocculation tank 2 (corresponding to the flocculation reaction tank) for subsequent treatment.

[0032] The flocculation tank 2 is provided with a flocculant dosing port for adding flocculant into the tank, so that the water after coagulation is fully mixed with the flocculant in the flocculation tank 2; the flow guide cylinder 11 in the flocculation tank 2 divides the flocculation reaction into two parts, the inside of the flow guide cylinder 11 is stirred by the stirring impeller 112 at the lower end of the stirring shaft 111 of the stirring device 10, so as to realize rapid flocculation; slow flocculation is realized between the outer wall of the flow guide cylinder 11 and the tank wall due to the push flow condition of the water flow, so as to ensure the increase and compaction of the alum flowers. Meanwhile, the water inlet suspended solid concentration detection device (not shown in the figure) is arranged at the water inlet of the coagulation tank 1, and the sludge backflow adjusting device (not shown in the figure) is arranged in the flocculation tank 2, which is connected with the sludge discharge pipe 14 at the bottom of the sedimentation tank 3 and the water inlet end of the flocculation tank 2; according to the data monitored by the water inlet suspended solid concentration detection device, the sludge backflow adjusting device is used to adjust the backflow of the concentrated sludge in the concentration tank of the sedimentation tank 3, so as to maintain the suspended solid concentration in the stirring tank area of the flocculation tank 2 at the optimal level.

[0033] The sedimentation tank 3 corresponds to the sedimentation tank 3 of the high-efficiency clarifying sedimentation tank 3 and the clarifying tank of the reflection plate 12; the area of the sedimentation tank 3 is relatively large; when the alum flowers formed by the micro-flocs enter the sedimentation tank 3, the moving speed of the alum flowers slows down, so as to avoid the breakage of the alum flowers and the formation of vortex, and most of the suspended solids are precipitated and concentrated in the sedimentation tank 3; the concentration tank is divided into an upper layer above the conical cylinder 13 and a lower layer below the conical cylinder 13; part of the concentrated sludge is pumped back to the water inlet at the bottom of the flow guide cylinder 11 of the flocculation tank 2 through the sludge discharge pipe 14, and the rest of the concentrated sludge is discharged to the sludge treatment system through the sludge discharge pipe 14; the concentration of the concentrated sludge is between 10-40 g / L; the reflection plate 12 is further arranged in the sedimentation tank 3; the sewage flows through the reflection plate 12 to remove the remaining alum flowers; by reasonably designing the inclination angle and spacing of the reflection plate 12 and the uniform water distribution device (such as the perforated water distribution pipe or the water distribution weir structure arranged at the water inlet end of the sedimentation tank 3), the water distribution is ensured to be uniform on the entire area of the reflection plate 12, so that the sedimentation is completed in the best state; the effluent passes through the overflow weir 7 at the top of the sedimentation tank 3, enters the effluent tank 4 through the effluent outlet 8, and then flows to the subsequent treatment facilities through the effluent pipe 9.

[0034] Example 2:

[0035] In this embodiment, in addition to the structural features of the preceding embodiments, the coagulation tank 1 comprises a plurality of reaction chambers 101 connected in series, the first reaction chamber 101 is connected to the water inlet, the last reaction chamber 101 is connected to the pipeline 1, the adjacent reaction chambers 101 are connected through the reserved holes 102, and each reaction chamber 101 is provided with a stirring device 10.

[0036] In this embodiment of the present application, the flocculation tank 2 is provided with a flow guide cylinder 11, and the flow guide cylinder 11 is provided with a stirring device 10.

[0037] In this embodiment of the present application, the stirring device 10 is a stirring shaft 111 driven by a motor, and the lower end of the stirring shaft 111 is provided with a stirring impeller 112 and extends into the reaction chamber 101 or the flow guide cylinder 11.

[0038] As shown in Figure 1 , Figure 2 and Figure 4 , due to the adoption of the above structure, the plurality of reaction chambers 101 of the coagulation tank 1, by optimizing the stirring speed, paddle shape, size and installation position of the stirring device 10 of each reaction chamber 101, further improves the coagulation effect, so that the fine suspended particles and colloidal ions in the water are more fully destabilized, aggregated and coagulated to form small floc. The stirring impeller 112 connected to the stirring shaft 111 in the flow guide cylinder 11 of the flocculation tank 2 can be frequency-adjusted according to the flocculation requirements to more accurately control the flocculation speed inside the flow guide cylinder 11, thereby forming larger, denser and uniform alum flowers.

[0039] Embodiment 3:

[0040] In this embodiment, in addition to the structural features of the preceding embodiments, the sedimentation tank 3 is provided with a reflection plate 12, and the reflection plate 12 is located between the pipeline 2 and the overflow weir 7.

[0041] As shown in Figure 2 , Figure 3 and Figure 6 , due to the adoption of the above structure, the reflection plate 12 in the sedimentation tank 3 can change the direction of the water flow, further slow down the moving speed of the alum flowers, cooperate with the larger area of the sedimentation tank 3, better avoid the breakage of the alum flowers and the formation of vortex, and make the suspended solids more fully precipitate. At the same time, the setting of the reflection plate 12 does not affect the precipitation and concentration of the sludge at the bottom of the sedimentation tank 3, and is convenient for the backflow and discharge of the sludge.

[0042] Embodiment 4:

[0043] In this embodiment, in addition to the structural features of the preceding embodiments, the sedimentation tank 3 is provided with a plurality of conical cylinders 13, and the sedimentation tank 3 is provided with a plurality of sludge discharge pipes 14, one end of each sludge discharge pipe 14 is bent downward to extend into the bottom of each conical cylinder 13, and the other end extends out of the sedimentation tank 3.

[0044] In this embodiment of the present application, the pipe two 6 is connected at one end with the I-shaped pipe 15 in the sedimentation tank 3, the middle part of the I-shaped pipe 15 is communicated with the pipe two 6, and the other four ends are downwardly bent and aligned with the conical cylinders 13.

[0045] As shown in Figures 1 to 3 and Figure 6 shown, due to the adoption of the above structure, the conical cylinder 13 at the bottom of the sedimentation tank 3 serves as a key structure for storing sludge, which helps to further increase the sludge concentration, so that the sludge concentration in the conical cylinder 13 is higher than that in other pool areas of the sedimentation tank 3, and the sludge for external discharge and backflow is discharged from the conical cylinder 13. The I-shaped pipe 15 connected with the pipe two 6 has a special structure which can uniformly distribute the water flow entering the sedimentation tank 3 to the upper part of each conical cylinder 13, so as to ensure that the water amount received by each conical cylinder 13 is relatively balanced with the sludge amount, which is beneficial to the sedimentation and concentration of the sludge in the conical cylinder 13, and also facilitates the subsequent backflow and discharge operation of the sludge.

[0046] Embodiment 5:

[0047] In this embodiment, in addition to the structural features of the foregoing embodiments, a walkway plate 16 is further included, which is erected on the top of the coagulation tank 1, the flocculation tank 2, the sedimentation tank 3 and the effluent tank 4, and is connected at one end with a staircase 17.

[0048] As shown in Figure 7 shown, due to the adoption of the above structure, the walkway plate 16 is erected on the top of the coagulation tank 1, the flocculation tank 2, the sedimentation tank 3 and the effluent tank 4, which provides a convenient passage for the staff, and facilitates the staff to perform daily inspection, maintenance and operation on the equipment in each tank body. The staircase 17 connected at one end facilitates the staff to go up and down the walkway plate 16, thereby improving the convenience and safety of the operation of the entire high-efficiency sedimentation tank 3.

[0049] It should be noted that in this document, the terms "comprise", "comprising", or any other variant thereof are intended to cover a non-exclusive inclusion, so that a process, method, article, or apparatus that comprises a list of elements does not only include those elements, but also includes other elements not expressly listed, or further includes elements inherent in such process, method, article, or apparatus. Without more limitations, an element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but can also include performing functions in a substantially simultaneous manner or in a reverse order, for example, the described method can be performed in an order different from that described, and various steps can also be added, omitted, or combined. In addition, the features described with reference to certain examples can be combined in other examples.

[0050] The embodiments of the present application are described above with reference to the accompanying drawings, but the present application is not limited to the specific embodiments described above, and the specific embodiments described above are merely illustrative, but not restrictive, and a person of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims.

Claims

1. A high-density reclaimed water reuse zero-discharge high-efficiency sedimentation tank, characterized in that, The coagulation pool, the flocculation pool, the sedimentation pool and the effluent pool are connected by pipes, and the sedimentation pool is provided with an overflow weir.

2. The high-density reclaimed water reuse zero-discharge high-efficiency sedimentation tank according to claim 1, characterized in that, The coagulation pool comprises a plurality of reaction chambers connected in series, the first reaction chamber is connected with the water inlet, the last reaction chamber is connected with the pipe I, the adjacent reaction chambers are connected by the reserved holes, and the stirring device is arranged in each reaction chamber.

3. The high-density reclaimed water reuse zero-discharge high-efficiency sedimentation pool according to claim 2, wherein the flocculation pool is provided with a flow guide cylinder, and the flow guide cylinder is provided with a stirring device.

4. The high-density reclaimed water reuse zero-discharge high-efficiency sedimentation pool according to claim 3, wherein the stirring device is a stirring shaft driven by a motor, and the lower end of the stirring shaft is provided with a stirring impeller and extends into the reaction chamber or the flow guide cylinder.

5. The high-density reclaimed water reuse zero-discharge high-efficiency sedimentation pool according to claim 1, wherein the sedimentation pool is provided with a reflection plate between the pipe II and the overflow weir.

6. The high-density reclaimed water reuse zero-discharge high-efficiency sedimentation pool according to claim 1, wherein the sedimentation pool is provided with a plurality of conical cylinders at the bottom, and the sedimentation pool is provided with a plurality of sludge discharge pipes, one end of each sludge discharge pipe is bent downward to extend into the bottom of each conical cylinder, and the other end extends out of the sedimentation pool.

7. The high-density reclaimed water reuse zero-discharge high-efficiency sedimentation pool according to claim 6, wherein the pipe II is connected with an I-shaped pipe at one end in the sedimentation pool, the middle part of the I-shaped pipe is connected with the pipe II, and the other four end outlets are bent downward to align with each conical cylinder.

8. The high-density reclaimed water reuse zero-discharge high-efficiency sedimentation pool according to any one of claims 1-7, further comprising a walkway plate arranged on the top of the coagulation pool, the flocculation pool, the sedimentation pool and the effluent pool, and one end is connected with a staircase.

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