Device for overflowing supernatant liquid in sewage treatment tank

Abstract

The utility model discloses a device for overflow of supernatant liquid in a sewage treatment tank, which comprises a separation pipe fixed on a fence of a sludge storage tank through a traction rope. The separation pipe is of a hollow tubular structure, drainage hoses are connected to the two ends of the separation pipe, and the bottom ends of the two drainage hoses are connected with the overflow pipe through a three-way valve. The bottom end of the separation pipe is connected with a balance weight adjusting device which is electrically connected with the controller. The device solves the problems that supernatant liquid in a sludge storage tank for gravity separation in the prior art cannot be completely discharged, the discharging process is tedious and the effect is poor, and has the characteristics that the position of the overflow port can be automatically adjusted along with the change of the liquid level, so that full-automatic overflow is realized, the supernatant liquid can be completely discharged, and the overall cost is relatively low.

Description

Technical Field

[0001] This utility model belongs to the field of municipal construction technology, specifically relating to a device for overflowing clear liquid from the upper layer of a sewage treatment pond. Background Technology

[0002] With the continuous development of urbanization and driven by social progress and economic growth, wastewater treatment has become an important task in urban construction and environmental protection. In the wastewater treatment process, the treatment and efficiency of sludge directly affect the stability and environmental benefits of the entire process. Currently, urban wastewater treatment plants urgently need to explore and research solutions to the problem of high sludge moisture content (approximately 83%~95%). Inappropriate equipment selection and the low efficiency and poor dewatering effect of conventional processes result in sludge that still has a high moisture content after treatment, affecting the effectiveness of subsequent treatment processes.

[0003] Sewage treatment plant sludge storage tanks generally have the function of sludge thickening. Sludge undergoes liquid-solid separation in the sludge storage tank, with the sludge at the bottom and the clear liquid at the top. Under the action of hydrostatic pressure, the sludge is squeezed out of water, which reduces the water content of the sludge. This is the sludge thickening function. The sludge storage tank is designed with a bottom sludge discharge pipe, a middle sludge inlet pipe, and an upper overflow pipe. The effective volume of the sludge storage tank can be divided into sludge volume, lower digested sludge volume, and upper sludge clear liquid volume. Sludge settles, and wastewater from the bottom of the tank is guided upwards. The upper clear liquid is below the overflow pipe opening and cannot be discharged. During mechanical sludge dewatering, the supernatant is drawn into the screw press dewatering machine by the screw pump pressure. Sludge dewatering and thickening is a crucial step in wastewater treatment, primarily serving the following purposes: reducing sludge moisture content (reducing sludge volume for easier subsequent treatment and disposal); increasing sludge concentration (increasing the solid matter content of the sludge and reducing sludge treatment costs); improving sludge dewatering performance (thickening increases the aggregation of sludge particles, enhancing dewaterability); reducing sludge disposal and transportation costs (significantly reducing sludge volume after dewatering and thickening, lowering disposal and transportation costs); and reducing sludge disposal volume (reducing the final sludge disposal requirement and minimizing environmental impact).

[0004] In existing technologies, sludge storage tank modifications involve gravity settling, resulting in liquid-solid separation of the sludge. The sludge is at the bottom, while the clarified liquid is at the top and discharged. The sludge at the bottom is squeezed out of water under hydrostatic pressure, reducing its moisture content from 99% to 95%. The remaining sludge is generally not suitable for separate gravity thickening; it is returned to the equalization tank for mixing and then gravity thickening, reducing the moisture content from 96%~98.5% to below 95%. Further dewatering of the remaining sludge is typically achieved through a screw press dewatering system. Screw press dewatering requires less floor space, uses less flushing water, has lower noise, and provides a better workshop environment. While the single-unit capacity is small, the required sludge moisture content is generally 95%, and the sludge moisture content at the outlet can typically reach 75%~83%. However, in actual construction, the overflow effect of the upper clear liquid is poor. The height of the overflow hole in the sludge storage tank is fixed. If it is set too high, the clear liquid below the overflow hole cannot be discharged and needs to be manually pumped out. If it is set too low, there is a risk of discharging the muddy water, which can easily cause blockage. The overall overflow effect is poor, and it is very inflexible in actual operation. Therefore, it is necessary to design a device for the overflow of the upper clear liquid in the sewage treatment tank to solve the above problems. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a device for overflowing the upper layer of clear liquid in a sewage treatment tank. This device solves the problems of the inability to completely discharge the upper layer of clear liquid in the gravity separation sludge storage tank of the prior art, the cumbersome discharge process, and the poor effect. It has the characteristics of automatically adjusting the position of the overflow port according to the change of liquid level, thereby realizing fully automated overflow, which can completely discharge the upper layer of clear liquid, and has the characteristics of low overall cost.

[0006] To achieve the above design, the technical solution adopted by this utility model is as follows:

[0007] The device for overflowing the upper layer of clear liquid in a sewage treatment tank includes a separation pipe, which is fixed to the enclosure of the sludge storage tank by a traction rope. The separation pipe is a hollow tubular structure with drainage hoses connected to both ends. The bottom ends of the two drainage hoses are connected to the overflow pipe through a three-way valve. A counterweight adjustment device is connected to the bottom end of the separation pipe and is electrically connected to the controller.

[0008] Preferably, the separator tube has openings at both ends, and the openings are threaded to connect with the plugs. A sealing ring is fitted onto the connection surface for sealing.

[0009] Preferably, the plug surface has an opening, and the top of the drain hose passes through the opening on the plug surface and is press-fitted with the inner wall of the plug opening to achieve a seal, and the top of the drain hose extends into the interior of the separator pipe.

[0010] Furthermore, the opening on the plug surface is located at the lower 1 / 3.

[0011] Preferably, the separation tube is placed horizontally and floats on the surface of the supernatant in the sludge storage tank, and multiple drainage holes are opened on the side surface of the separation tube from 1 / 3 to 2 / 3 of its height from top to bottom.

[0012] Furthermore, a horizontal spacing of 5cm and a layer spacing of 3 rows are recommended, with an aperture of 8mm.

[0013] Preferably, the inner wall of the separator is fitted with a cylindrical steel wire filter that matches the drainage hole.

[0014] Preferably, the counterweight adjustment device includes a magnetic base, which is a magnet with an arc-shaped plate structure, and the magnetic base is fixed to the lower 1 / 3 area of ​​the side surface of the separation tube by a clamp.

[0015] Preferably, two sets of liquid level sensors are connected to both sides of the magnetic base via brackets.

[0016] Preferably, the counterweight adjustment device further includes a support rod connected to the outer surface of the three-way valve. A strip electromagnet is connected to the top of the support rod and cooperates with the magnetic base. The electromagnet is electrically connected to a variable voltage power supply, and the power supply is electrically connected to the controller.

[0017] Preferably, one end of the overflow pipe is connected to a three-way valve, and the other end passes through an opening at the bottom of the sludge storage tank and communicates with the overflow channel outside the sludge storage tank; a solenoid valve is installed on the overflow pipe, and the solenoid valve is electrically connected to the controller.

[0018] Furthermore, the bottom of the magnetic base is a flat structure, and the surface on the opposite side of the electromagnet is also a flat structure, which can prevent the separation tube from flipping over.

[0019] Furthermore, the power supply is adjustable in both directions, which can change the magnetism of the electromagnet. When there are too many impurities in the separation tube and the weight is too great, even if the magnetic attraction force is reduced, it cannot float to the predetermined position under its own buoyancy. In this case, it can float by magnetic repulsion.

[0020] The beneficial effects of the above-mentioned device for overflowing clear liquid from the upper layer of a wastewater treatment tank are as follows:

[0021] 1. This device solves the problems of the inability to completely discharge the upper clear liquid in the sludge storage tank of the existing gravity separation technology, the cumbersome discharge process, and the poor effect. It has the characteristics of automatically adjusting the overflow port position according to the change of liquid level, thereby realizing fully automated overflow, which can completely discharge the upper clear liquid, and the overall cost is low.

[0022] 2. The device is equipped with a counterweight adjustment mechanism that can adjust the buoyancy height of the separation tube. This allows for automatic position adjustment via sensors, avoiding errors caused by human observation. This ensures that the entire separation tube remains at the optimal height throughout the overflow process, regardless of changes in liquid level, guaranteeing effective separation. Furthermore, the counterweight adjustment mechanism allows the device to adapt to different water bodies and operating conditions. When the buoyancy of the water changes, or when silt accumulates inside the separation tube causing changes in its own buoyancy, the counterweight adjustment mechanism can automatically adjust, giving the device excellent adaptability. Compared to existing technologies that only allow for a single overflow outlet at a fixed height in the pool wall, this device offers significantly improved flexibility.

[0023] 3. The device itself has a simple structure and low manufacturing cost, and does not require much modification to the sludge storage tank; it is suitable for implementation based on existing technology, and cleverly solves a major problem at a very low cost. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the magnetic base in an embodiment of this utility model;

[0026] Figure 3 This is a schematic diagram of the electrical component connection in an embodiment of the present utility model;

[0027] The attached diagram is labeled as follows: 1. Separation pipe; 2. Traction rope; 3. Drainage hose; 4. Three-way valve; 41. Support rod; 5. Overflow pipe; 51. Solenoid valve; 6. Controller; 7. Drainage hole; 8. Magnetic base; 81. Liquid level sensor; 9. Electromagnet; 10. Bottom wall of sludge storage tank; 11. Power supply. Detailed Implementation

[0028] like Figure 1 As shown, the device for overflowing the upper layer of clear liquid in the sewage treatment tank includes a separation pipe 1, which is fixed to the fence of the sludge storage tank by a traction rope 2. The separation pipe 1 is a hollow tubular structure, and both ends of the separation pipe 1 are connected to drainage hoses 3. The bottom ends of the two drainage hoses 3 are connected to the overflow pipe 5 through a three-way valve 4. The bottom end of the separation pipe 1 is connected to a counterweight adjustment device, which is electrically connected to a controller 6.

[0029] Preferably, the separator tube 1 has openings at both ends, and the openings are provided with threads that connect to the plugs. A sealing ring is fitted onto the connection surface for sealing.

[0030] Preferably, the plug surface has an opening, and the top end of the drain hose 3 passes through the opening on the plug surface and is press-fitted with the inner wall of the plug opening to achieve a seal. The top end of the drain hose 3 extends into the interior of the separation pipe 1.

[0031] Furthermore, the opening on the plug surface is located at the lower 1 / 3.

[0032] Preferably, the separation pipe 1 is placed horizontally and floats on the surface of the supernatant in the sludge storage tank, and multiple drainage holes 7 are opened on the side surface of the separation pipe 1 from 1 / 3 to 2 / 3 of its height from top to bottom.

[0033] Furthermore, a horizontal spacing of 5cm and a layer spacing of 3 rows are recommended, with an aperture of 8mm.

[0034] Preferably, the inner wall of the separation tube 1 is fitted with a cylindrical steel wire filter screen that matches the drainage hole 7.

[0035] like Figure 2 As shown, the counterweight adjustment device includes a magnetic base 8, which is a magnet with an arc-shaped plate structure. The magnetic base 8 is fixed to the lower 1 / 3 area of ​​the side surface of the separation tube 1 by a clamp.

[0036] Preferably, two sets of liquid level sensors 81 are connected to both sides of the magnetic base via brackets.

[0037] Preferably, the counterweight adjustment device further includes a support rod 41 connected to the outer surface of the three-way valve 4. A strip electromagnet 9 is connected to the top of the support rod 41 and cooperates with the magnetic base 8. The electromagnet 9 is electrically connected to the variable voltage power supply 11, and the power supply 11 is electrically connected to the controller 6.

[0038] Preferably, one end of the overflow pipe 5 is connected to the three-way valve 4, and the other end passes through the opening at the bottom of the sludge storage tank and communicates with the overflow channel outside the sludge storage tank; a solenoid valve 51 is provided on the overflow pipe 5, and the solenoid valve 51 is electrically connected to the controller 6.

[0039] Furthermore, the bottom of the magnetic base 8 is a flat structure, and the opposite side surface of the electromagnet 9 is also a flat structure, which can prevent the separation tube 1 from flipping over.

[0040] Furthermore, the power supply 11 is a positive and negative adjustable power supply 11, which can change the magnetism of the electromagnet 9. When there are too many impurities in the separation tube 1 and the weight is too large, even if the magnetic attraction force is reduced, it cannot float to the predetermined position under its own buoyancy. In this case, it can float up by magnetic repulsion.

[0041] like Figure 3 As shown, the separation method of the above-mentioned device for the overflow of clear liquid from the upper layer of a sewage treatment tank includes the following steps:

[0042] S1, fix the separation tube 1 to the fence of the sludge storage tank by the traction rope 2, and then lower the separation tube 1 to the surface of the supernatant of the sludge storage tank that has been settled and separated, so that the separation tube 1 is attached to the water surface; set the warning threshold △H of the liquid level sensor 81;

[0043] S2, the counterweight adjustment device is adjusted by the controller 6 so that the lower 1 / 3 of the separation tube 1 is below the liquid surface. The specific method is as follows:

[0044] If the liquid level sensor 81 does not detect the liquid level signal, it indicates that the buoyancy of the separation tube 1 is too large. The controller 6 increases the voltage of the power supply 11 to increase the magnetic force between the electromagnet 9 and the magnetic base 8, thereby moving the separation tube 1 downward until the liquid level sensor 81 detects the liquid level signal.

[0045] If the liquid level sensor 81 detects a liquid level signal, but the liquid level reading exceeds the warning threshold △H, it indicates that the buoyancy of the separation tube 1 is too small and the counterweight is too heavy. The controller 6 reduces the voltage of the power supply 11 to reduce the magnetic force between the electromagnet 9 and the magnetic base 8, thereby moving the separation tube 1 upward under the action of buoyancy until the liquid level sensor 81 detects a liquid level signal that does not exceed the warning threshold △H.

[0046] S3, after adjusting the height of the separation pipe 1, the controller 6 controls the solenoid valve 51 to open. At this time, the upper clear liquid enters the interior of the separation pipe 1 through the drainage hole 7, and then flows along the two drainage hoses 3 through the bottom overflow pipe 5 under the action of gravitational potential energy, and finally flows to the outside of the sludge storage tank.

[0047] S4. During the overflow process, the controller 6 collects the signal from the liquid level sensor 81 in real time and adjusts the position of the separator 1 in real time until the overflow is completed; the plugs at both ends of the separator 1 are removed and the inner wall is cleaned.

[0048] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The embodiments and features described in this application can be arbitrarily combined without conflict. The protection scope of this utility model should be defined as the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A device for the overflow of supernatant from a sewage treatment tank, characterised in that: The system includes a separation pipe (1), which is fixed to the mud storage tank enclosure by a traction rope (2); the separation pipe (1) is a hollow tubular structure, with drainage hoses (3) connected to both ends of the separation pipe (1), and the bottom ends of the two drainage hoses (3) are connected to the overflow pipe (5) through a three-way valve (4); the bottom end of the separation pipe (1) is connected to a counterweight adjustment device, which is electrically connected to the controller (6); the separation pipe (1) has openings at both ends, with threads inside the openings that are threaded to the plugs, and sealing rings are fitted on the connecting surfaces for sealing; the plugs have openings on their surfaces, and the top of the drainage hoses (3) passes through the openings on the surface of the plugs and is press-fitted to the inner wall of the openings of the plugs to achieve a seal, with the top of the drainage hoses (3) extending into the interior of the separation pipe (1).

2. The device for the overflow of supernatant from a sewage treatment tank according to claim 1, characterized in that: The separation tube (1) is placed horizontally and floats on the surface of the supernatant in the sludge storage tank. Multiple drainage holes (7) are provided on the side surface of the separation tube (1) from 1 / 3 to 2 / 3 of its height from top to bottom.

3. A device for the overflow of supernatant from a sewage treatment tank according to claim 2, characterised in that: The inner wall of the separation tube (1) is fitted with a cylindrical steel wire filter and a drainage hole (7).

4. The apparatus for supernatant overflow of a sewage treatment tank according to claim 1, characterized in that: The counterweight adjustment device includes a magnetic base (8), which is a magnet with an arc-shaped plate structure. The magnetic base (8) is fixed to the lower 1 / 3 area of ​​the side surface of the separation tube (1) by a clamp.

5. The device for overflowing clear liquid from the upper layer of a sewage treatment tank according to claim 4, characterized in that: Two sets of liquid level sensors (81) are connected to both sides of the magnetic base (8) via brackets.

6. A device for the overflow of supernatant from a sewage treatment tank according to claim 5, characterised in that: The counterweight adjustment device also includes a support rod (41) connected to the outer surface of the three-way valve (4). A strip electromagnet (9) is connected to the top of the support rod (41) and cooperates with the magnetic base (8). The electromagnet (9) is electrically connected to a variable voltage power supply, and the power supply is electrically connected to the controller (6).

7. The apparatus for supernatant overflow of a sewage treatment tank according to claim 1, characterized in that: One end of the overflow pipe (5) is connected to the three-way valve (4), and the other end passes through the opening at the bottom of the sludge storage tank and is connected to the overflow channel outside the sludge storage tank; a solenoid valve (51) is installed on the overflow pipe (5), and the solenoid valve (51) is electrically connected to the controller (6).

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