A sand-water separator

Abstract

A sand-water separator includes a water tank with an inclined inner bottom. A spiral sand-water separation component is located at the bottom of the water tank. The water tank includes a first inlet, a second inlet, and an overflow outlet. A grading component is connected upstream of the first and second inlets. The grading component includes a first branch pipe and a second branch pipe. The first branch pipe is connected to the first inlet and is used to input a sand-water mixture with a high solids content. The second branch pipe is connected to the second inlet and is equipped with a centrifugal separator for separating the sand-water mixture with a low solids content through centrifugal sedimentation, and the settled mixture is then input into the water tank. A circulation component is connected downstream of the overflow outlet and is connected to the second branch pipe for circulating the sand-water mixture upstream of the centrifugal separator on the second branch pipe. This grading component enables differentiated treatment of sand-water mixtures with different solids contents, and has wide-ranging applications.

Description

Technical Field

[0001] This utility model relates to a sewage treatment device, and more particularly to a sand-water separator. Background Technology

[0002] Grit chambers are designed to remove sand and gravel with a relative density of 1.3~2.7 and a particle size of 0.1~0.3mm. Taking a cyclone grit chamber as an example, the removal rate of sand and gravel with a particle size of 0.297mm and above reaches 95%, and the removal rate of sand and gravel with a particle size of 0.105mm and above reaches 70%. According to the standard JB / T 14094-2020 "Spiral Sand and Water Separator", the separation efficiency of a sand-water separator for particles with a particle size of 0.2mm and above is ≥98%. However, the actual effect is difficult to achieve.

[0003] According to "Urban Drainage", the sedimentation rate of separate sewage systems can be calculated based on 10,000 m³. 3 Sediment 0.4~3m 3 Calculations based on a 60% moisture content indicate a higher grit volume in combined sewer systems. However, the actual grit discharge, as shown in the table below, is only 0.15~0.6m³. 3 / (ten thousand m) 3 According to Jiang Ning's "Sand Removal Capacity and Enhanced Removal Technology of Fine Sand in the Pretreatment Section of Wastewater Treatment Plants," the SS concentration in the overflow pipe of the sand separator is 600mg / L~5000mg / L, and the SS in the overflow water accounts for 20% of the total SS in the influent, returning to the main line of wastewater treatment. This is because the sand separator is ineffective at removing sand and gravel with a particle size of less than 0.2mm.

[0004] CN119118288A discloses a hydrocyclone sand removal system and control method for low solids content wastewater. Multiple hydrocyclones are connected in parallel upstream of a sand-water separator. The opening and closing of the hydrocyclone branches are automatically controlled according to changes in the total influent pressure. This effectively solves problems such as unstable flow patterns and poor sand removal efficiency caused by fluctuations in influent flow, achieving efficient and stable treatment of low solids content wastewater. However, it is only applicable to low solids content wastewater, limiting its application scenarios.

[0005] CN113144698A discloses a high-efficiency pretreatment system for the combined removal of sand and slag. A hydrocyclone and a perforated bar screen are connected in series upstream of a sand-water separator. This system utilizes a method of removing sand first and then slag for wastewater pretreatment, significantly improving sand removal efficiency. However, wastewater with high solids content directly entering the hydrocyclone and perforated bar screen can easily cause equipment blockage. Utility Model Content

[0006] In view of this, it is necessary to provide a sand-water separator that has high sand removal efficiency, wide application scenarios, and can classify wastewater with different solid content.

[0007] A sand-water separator includes a water tank with an inclined inner bottom. A spiral sand-water separation component is provided at the bottom of the water tank. The water tank includes a first inlet, a second inlet, and an overflow outlet. A grading component is connected upstream of the first and second inlets. The grading component includes a first branch pipe and a second branch pipe. The first branch pipe is connected to the first inlet and is used to input a sand-water mixture with a high solids content. The second branch pipe is connected to the second inlet and is equipped with a centrifugal separation device for separating the sand-water mixture with a low solids content through centrifugal sedimentation and inputting the settled mixture into the water tank. A circulation component is connected downstream of the overflow outlet and is connected to the second branch pipe for circulating the sand-water mixture upstream of the centrifugal separation device on the second branch pipe.

[0008] Furthermore, the grading component includes an inlet pipe, the end of which is connected to a first branch pipe and a second branch pipe. The first branch pipe is provided with a first water inlet valve, and the second branch pipe is provided with a second water inlet valve. The second water inlet valve is located upstream of the centrifugal separator.

[0009] Furthermore, the centrifugal separator is provided with an outlet and a tangentially arranged inlet at the upper part, and a sand settling port at the lower end. The inlet is connected to the second branch pipe, and the sand settling port is connected to the second inlet.

[0010] Furthermore, the centrifugal separation device is a microcyclone separator.

[0011] Furthermore, the circulation component includes a temporary storage tank, and the overflow port of the water tank and the outlet of the centrifugal separator are both connected to the temporary storage tank. The temporary storage tank is provided with a circulation port and a drain port. The circulation port is connected to the upstream of the circulation pump, and the downstream of the circulation pump is connected to the upstream of the second inlet valve. The drain port is connected to a drain pipe, and a drain valve is provided on the drain pipe.

[0012] Furthermore, the water tank is provided with a baffle, the baffle including a partition on the top wall of the water tank, the overflow port is provided on one side of the partition, the first inlet and the second inlet are provided on the other side of the partition, the height of the partition is less than the height of the water tank; the lower end of the partition is provided with a guide section, the guide section extends below the first inlet and the second inlet, and the length of the guide section is greater than the distance from the first inlet and the second inlet to the partition.

[0013] Furthermore, the lower end of the partition is provided with a horizontally arranged overflow section, which extends to below the overflow port. The length of the overflow section is greater than the distance between the overflow port and the partition. The end of the overflow section is provided with an upwardly extending overflow weir, the height of which does not reach the top wall of the water tank.

[0014] Furthermore, a check valve is provided downstream of the inlet pipe and the circulation pump.

[0015] Furthermore, the temporary storage tank is equipped with a level gauge, the inlet pipe is equipped with an online SS monitor, and all components of the sand-water separator are electrically connected to the PLC cabinet.

[0016] Furthermore, the separation assembly includes several parallel second branch pipes, each of which is sequentially equipped with a second inlet valve and a centrifugal separation assembly, and the inlet pipe is equipped with a pressure transmitter.

[0017] The beneficial effects of this utility model include at least the following: 1. The high-solids-content mixture is directly fed into the water tank for coarse separation through the grading component, while the low-solids-content mixture is pre-sedimented by the centrifugal separator before entering the water tank. This achieves differentiated treatment of sand-water mixtures with different solids contents, which has a wide range of applications. It also avoids the high-solids-content mixture from directly entering the centrifugal separator, reducing the risk of equipment blockage.

[0018] 2. The mixture discharged from the overflow port is reintroduced into the upstream of the centrifugal separator through the circulation component, forming multiple cycles and improving separation efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the first embodiment of the sand-water separator of this utility model.

[0020] Figure 2 for Figure 1 Enlarged view of region A in the medium sand water separator.

[0021] Figure 3 This is a schematic diagram of the second embodiment of the sand-water separator of this utility model. Detailed Implementation

[0022] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0023] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] Figure 1 and Figure 2 The image shows a sand-water separator in the first embodiment of this utility model, including a water tank 1 with an inclined inner bottom. The bottom of the water tank 1 is provided with a spiral sand-water separation component 2 (existing technology, so it will not be described in detail). The water tank 1 includes a first inlet 11, a second inlet 12 and an overflow outlet 13. A grading component is connected upstream of the first inlet 11 and the second inlet 12. The grading component includes a first branch pipe 31 and a second branch pipe 32. The first branch pipe 31 is connected to the first inlet 11 and is used to input a sand-water mixture with a high solids content. The second branch pipe 32 is connected to the second inlet 12 and is equipped with a centrifugal separator 33, which is used to separate the sand-water mixture with a low solids content through centrifugal sedimentation and input the settled mixture into the water tank 1. A circulation component is connected downstream of the overflow port 13. The circulation component is connected to the second branch pipe 32 and is used to circulate the sand-water mixture to the upstream of the centrifugal separator 33 on the second branch pipe 32.

[0026] Specifically, the grading component includes an inlet pipe 34, the end of which is connected to a first branch pipe 31 and a second branch pipe 32. The first branch pipe 31 is provided with a first water inlet valve 35, and the second branch pipe 32 is provided with a second water inlet valve 36. The second water inlet valve 36 is located upstream of the centrifugal separation device 33.

[0027] The centrifugal separator 33 has an outlet 331 and a tangentially arranged inlet 332 at its upper part, and a sand settling port 333 at its lower end. The inlet 332 is connected to the second branch pipe 32, and the sand settling port 333 is connected to the second inlet 12. Specifically, the centrifugal separator 33 adopts a micro-cyclone separator.

[0028] The circulation assembly includes a temporary storage tank 41. The overflow port 13 of the water tank 1 and the outlet 331 of the micro-cyclone separator are both connected to the temporary storage tank 41. The temporary storage tank 41 is provided with a circulation port and a drain port. The circulation port is connected to the upstream of the circulation pump 42, and the downstream of the circulation pump 42 is connected to the upstream of the second inlet valve 36. The drain port is connected to a drain pipe 43, and a drain valve 44 is provided on the drain pipe 43.

[0029] When the solid content of the sand-water mixture is high (≥10g / L), the operating procedure is as follows: The first inlet valve 35 is opened and the second inlet valve 36 is closed. The sand-water lifting equipment in the sedimentation tank is started. The sand-water mixture flows sequentially through the inlet pipe 34, the first branch pipe 31 and the first inlet 11 into the water tank 1. The settled sand particles are carried out by the spiral sand-water separation component 2. The overflow wastewater enters the temporary storage tank 41 through the overflow port 13 for temporary storage. The amount of sand-water mixture is adapted to the volume of the temporary storage tank 41. After the sand-water lifting equipment in the sedimentation tank is stopped, the first inlet valve 35 is closed and the second inlet valve 36 is opened. The circulating pump 42 is started. The sand-water mixture enters the centrifugal separation device 33 through the second branch pipe 32. Under the action of centrifugal sedimentation, the relatively clean water enters the temporary storage tank 41 through the outlet 331. The settled sand enters the water tank 1 again through the sedimentation port 333 for sedimentation. The overflow wastewater returns to the temporary storage tank 41 for temporary storage. The circulation pump 42 is shut off at regular intervals to ensure that the wastewater in the temporary storage tank 41 is circulated twice (the number of times is adjustable). When it is necessary to empty the tank, the circulation pump 42 stops, the first inlet valve 35 opens, the second inlet valve 36 closes, and the drain valve 44 opens to drain the water in the temporary storage tank 41 to the sewage treatment inlet for re-treatment. The tank is shut off after the temporary storage tank 41 is emptied.

[0030] When the solids content of the sand-water mixture is low (<10g / L), the operating procedure is as follows: The first inlet valve 35 is closed, and the second inlet valve 36 is opened. The grit chamber's sand-water lifting equipment starts, and the sand-water mixture flows sequentially through the inlet pipe 34, the second branch pipe 32, and the second inlet 12 into the water tank 1. The overflow wastewater from the water tank 1 and the micro-cyclone separator enters the temporary storage tank 41 for temporary storage. The amount of sand-water mixture is adapted to the volume of the temporary storage tank 41. After the sand-water lifting equipment in the grit chamber stops, the circulation pump 42 starts, and the sand-water mixture enters the micro-cyclone separator. The overflow wastewater from the water tank 1 and the micro-cyclone separator returns to the temporary storage tank 41 for temporary storage. The circulation pump 42 is shut down periodically to ensure that the wastewater in the temporary storage tank 41 is circulated twice (the number of times is adjustable). When it is necessary to empty the tank, the circulation pump 42 stops, the first inlet valve 35 opens, the second inlet valve 36 closes, and the drain valve 44 opens to drain the water in the temporary storage tank 41 to the sewage treatment inlet for re-treatment. The tank is closed after it is emptied.

[0031] Optionally, the water tank 1 is provided with a baffle 14, which includes a partition 141 fixedly connected to the top wall of the water tank 1. The overflow port 13 is located on one side of the partition 141, and the first inlet 11 and the second inlet 12 are located on the other side of the partition 141. The height of the partition 141 is less than the height of the water tank 1. A horizontally arranged guide section 142 is fixedly connected to the lower end of the partition 141. The guide section 142 extends below the first inlet 11 and the second inlet 12, and the length of the guide section 142 is greater than the distance from the first inlet 11 and the second inlet 12 to the partition 141. After the sand-water mixture enters the water tank 1 through the first inlet 11 and the second inlet 12, it flows along the guide section 142 in a direction away from the overflow port 13, preventing solids from directly entering the overflow port 13 with the water flow before sufficient settling.

[0032] The lower end of the partition 141 is also fixedly connected to a horizontally arranged overflow section 143. The overflow section 143 extends below the overflow port 13, and the length of the overflow section 143 is greater than the distance between the overflow port 13 and the partition 141. The end of the overflow section 143 is provided with an upwardly extending overflow weir 144, and the height of the overflow weir 144 does not reach the top wall of the water tank 1. By setting the overflow weir 144, the liquid flow rate near the overflow port 13 is made more gradual, and the settled sand particles are further blocked, reducing the solid content in the overflow wastewater.

[0033] The inlet pipe 34 and downstream of the circulation pump 42 are equipped with check valves (37, 46) to prevent wastewater from flowing back from the micro-cyclone separator to the temporary storage tank 41 or the pump body when the circulation pump 42 stops or the pressure fluctuates, ensuring that the wastewater flows only in the treatment direction and avoiding the deposition of gravel or SS re-entering the main line.

[0034] The temporary storage tank 41 is equipped with a level gauge 45 for real-time monitoring of the liquid level to ensure that the capacity of the temporary storage tank 41 accurately matches the influent volume, preventing overflow or insufficient treatment. The inlet pipe 34 is equipped with an online solids content (SS) monitor 38. All components of the sand-water separator are electrically connected to the PLC cabinet. The online SS monitor 38 determines the solids content of the sand-water mixture, and the PLC cabinet enables automatic control.

[0035] Figure 3 The image shows a sand-water separator according to a second embodiment of this utility model. This second embodiment is largely the same as the first embodiment. The difference lies in that the water tank of the sand-water separator in this embodiment includes two second inlets 12, 12', and the separation components include two sets of parallel second branch pipes 32, 32'. Each parallel branch pipe is sequentially equipped with a second valve 36, 36' and a centrifugal separation component 33, 33'. A pressure transmitter 39 is also provided on the inlet pipe 34.

[0036] When the solids content of the sand-water mixture is low (<10g / L), the wastewater directly enters the centrifugal separation components 33 and 33' through the inlet pipe 34. Due to the large fluctuations in the influent flow rate between the rainy and dry seasons, and between the flood season and the non-flood season, the significant fluctuations in the influent flow rate will have a significant impact on the operation of the hydrocyclone. In this embodiment, the pressure transmitter 39 monitors the total influent pressure in real time and controls the valves on the parallel branch pipes through the PLC cabinet. Based on the changes in the total influent pressure, it automatically controls the opening and closing of the second valves 36 and 36', effectively solving the problems of unstable operating flow and poor sand removal effect caused by fluctuations in influent flow rate.

[0037] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0038] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A sand-water separator, characterized in that: The system includes a water tank with an inclined inner bottom. The bottom of the water tank is equipped with a spiral sand-water separation component. The water tank includes a first inlet, a second inlet, and an overflow outlet. A grading component is connected upstream of the first and second inlets. The grading component includes a first branch pipe and a second branch pipe. The first branch pipe is connected to the first inlet and is used to input a sand-water mixture with a high solids content. The second branch pipe is connected to the second inlet and is equipped with a centrifugal separator for separating the sand-water mixture with a low solids content through centrifugal sedimentation and inputting the settled mixture into the water tank. A circulation component is connected downstream of the overflow outlet and is connected to the second branch pipe for circulating the sand-water mixture upstream of the centrifugal separator on the second branch pipe.

2. The sand-water separator according to claim 1, characterized in that: The grading component includes an inlet pipe, the end of which is connected to a first branch pipe and a second branch pipe. The first branch pipe is equipped with a first water inlet valve, and the second branch pipe is equipped with a second water inlet valve. The second water inlet valve is located upstream of the centrifugal separator.

3. The sand-water separator according to claim 2, characterized in that: The centrifugal separator is provided with an outlet and a tangentially arranged inlet at the upper part, and a sand settling port at the lower end. The inlet is connected to the second branch pipe, and the sand settling port is connected to the second inlet.

4. The sand-water separator according to claim 3, characterized in that: The centrifugal separation device is a microcyclone separator.

5. The sand-water separator according to claim 3, characterized in that: The circulation assembly includes a temporary storage tank. The overflow port of the water tank and the outlet of the centrifugal separator are both connected to the temporary storage tank. The temporary storage tank is provided with a circulation port and a drain port. The circulation port is connected to the upstream of the circulation pump, and the downstream of the circulation pump is connected to the upstream of the second inlet valve. The drain port is connected to a drain pipe, and a drain valve is provided on the drain pipe.

6. The sand-water separator according to claim 1, characterized in that: The water tank is equipped with a baffle, which includes a partition on the top wall of the water tank. The overflow port is located on one side of the partition, and the first inlet and the second inlet are located on the other side of the partition. The height of the partition is less than the height of the water tank. The lower end of the partition is equipped with a guide section, which extends below the first inlet and the second inlet. The length of the guide section is greater than the distance from the first inlet and the second inlet to the partition.

7. The sand-water separator according to claim 6, characterized in that: The lower end of the partition is also provided with a horizontally arranged overflow section, which extends to the bottom of the overflow port. The length of the overflow section is greater than the distance between the overflow port and the partition. The end of the overflow section is provided with an upwardly extending overflow weir, the height of which does not reach the top wall of the water tank.

8. The sand-water separator according to claim 5, characterized in that: A check valve is provided downstream of the inlet pipe and the circulation pump.

9. The sand-water separator according to claim 5, characterized in that: The temporary storage tank is equipped with a level gauge, the inlet pipe is equipped with an online SS monitor, and all components of the sand-water separator are electrically connected to the PLC cabinet.

10. The sand-water separator according to claim 9, characterized in that: The separation assembly includes several parallel second branch pipes, each of which is sequentially equipped with a second inlet valve and a centrifugal separation assembly, and a pressure transmitter is provided on the inlet pipe.

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