Automatic drainage and separation device and separation method for supernate in sludge storage tank of sewage treatment plant

Abstract

The invention discloses an automatic drainage and separation device and method for supernate of a sludge storage tank of a sewage treatment plant. The automatic drainage and separation device comprises a separation pipe, and the separation pipe is fixed to a sludge storage tank fence 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] The invention belongs to the technical field of municipal construction, and in particular relates to an automatic drainage and separation device and a separation method for supernatant liquid in a sludge storage tank of a sewage treatment plant. Background Art

[0002] In the sewage treatment process, the treatment and treatment efficiency of sludge are directly related to the stability and environmental benefits of the entire sewage treatment process. At present, urban sewage treatment plants urgently need to discuss and study the problem of high sludge moisture content (about 83%~95%). The selection of facilities and equipment is inappropriate, and the dehydration equipment is inefficient during the conventional process dehydration, and the dehydration effect on sludge is poor. The treated sludge still has a high moisture content, which affects the effect of subsequent treatment processes.

[0003] The sludge storage tank in a sewage treatment plant generally has the function of sludge thickening. The sludge is separated into liquid and solid in the sludge storage tank, with the sludge at the bottom and the clear liquid at the top. The sludge squeezes out water under the action of hydrostatic pressure, reducing 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, a lower digested sludge volume and an upper sludge clear liquid volume. The sludge is deposited and the sewage in the middle of the tank is guided to the upper part from the bottom. The upper clear liquid is lower than the overflow pipe and cannot be discharged. When the sludge is mechanically dehydrated, the supernatant is sucked into the screw dewatering machine with the pressure of the screw pump. Sludge dehydration and thickening is a very important link in the sewage treatment process. Its main functions are: reducing the moisture content of sludge: reducing the volume of sludge for subsequent treatment and disposal; increasing sludge concentration: increasing the solid matter content of sludge and reducing the cost of sludge treatment; improving sludge dewatering performance: increasing the aggregation degree of sludge particles through thickening and enhancing its dehydrability; reducing sludge disposal and transportation costs: the volume of sludge after dehydration and thickening is greatly reduced, reducing disposal and transportation costs; reducing sludge disposal volume: reducing the final disposal demand of sludge and reducing environmental impact.

[0004] In the prior art, the sludge storage tank is transformed under the action of gravity sedimentation. The sludge is separated into liquid and solid in the sludge storage tank. The sludge is at the bottom and the clear liquid is drained on the top. The sludge at the bottom squeezes out water under the action of hydrostatic pressure, so that the sludge moisture content drops from 99% to 95%. The remaining sludge is generally not suitable for gravity concentration alone. It is returned to the regulating tank for mixing and then gravity concentration is carried out. The moisture content can be reduced from 96%~98.5% to below 95%; the remaining sludge is generally further dehydrated by means of screw press dehydration. The screw press dehydration occupies a small area, has a small amount of flushing water, low noise, and a good workshop environment, but the single machine capacity is The inlet sludge moisture content is generally required to be 95%, and the outlet sludge moisture content can generally reach 75%~83%; however, in actual construction, the overflow effect of the upper clear liquid is not good, and 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 requires manual pumping, while if it is set too low, there is a risk of discharging muddy water, which is easy to cause blockage; the overall overflow effect is poor, and the actual operation is very inflexible; therefore, it is necessary to design an automatic drainage and separation device and separation method for the supernatant of the sludge storage tank of a sewage treatment plant to solve the above problems. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an automatic drainage and separation device and separation method for the supernatant liquid in the sludge storage tank of a sewage treatment plant. The device solves the problems of the upper clear liquid in the gravity separation sludge storage tank in the prior art that the upper clear liquid cannot be discharged cleanly, the discharge process is cumbersome, and the effect is poor. The device has the characteristics of automatically adjusting the overflow port position as the liquid level changes, thereby realizing fully automated overflow, and the upper clear liquid can be discharged cleanly, and the overall cost is low.

[0006] In order to realize the above-mentioned design, the technical solution adopted by the present invention is: The automatic drainage and separation device of the supernatant in the sludge storage tank of a sewage treatment plant includes a separation tube, which is fixed to the fence of the sludge storage tank by a traction rope; the separation tube is a hollow tubular structure, and drainage hoses are connected to both ends of the separation tube, and the bottom ends of the two drainage hoses are connected to the overflow pipe through three-way valves; the bottom end of the separation tube is connected to a counterweight adjustment device, and the counterweight adjustment device is electrically connected to a controller.

[0007] Preferably, both ends of the separation tube are open, threads are provided in the openings to be threadedly connected with the plug, and a sealing ring is provided on the connection surface for sealing.

[0008] Preferably, a hole is opened on the surface of the plug, and the top end of the drainage hose passes through the hole on the surface of the plug and is interference fit with the inner wall of the hole of the plug to achieve sealing, and the top end of the drainage hose extends to the inside of the separation tube.

[0009] Furthermore, the opening on the surface of the plug is located at the lower 1 / 3.

[0010] Preferably, the separation tube is placed horizontally and floats on the surface of the supernatant in the mud storage tank, and a plurality of drainage holes are provided on the side surface of the separation tube from 1 / 3 to 2 / 3 of the height from the top to the bottom.

[0011] Furthermore, the horizontal distance is 5 cm, the layer distance is 3 rows, and the hole diameter is 8 mm.

[0012] Preferably, a steel wire filter with a cylindrical structure is embedded in the inner wall of the separation tube and cooperates with the drainage hole.

[0013] Preferably, the counterweight adjustment device includes a magnetic base, which is a magnet with an arc-shaped plate structure. The magnetic base is fixed to the lower 1 / 3 area of ​​the side surface of the separation tube by a clamp.

[0014] Preferably, two groups of liquid level sensors are connected to both sides of the magnetic base through brackets.

[0015] Preferably, the counterweight adjustment device also includes a support rod connected to the outer surface of the three-way valve, the top of the support rod is connected to a bar-shaped electromagnet that cooperates with the magnetic base, the electromagnet is electrically connected to a variable pressure power supply, and the power supply is electrically connected to a controller.

[0016] Preferably, one end of the overflow pipe is connected to the three-way valve, and the other end passes through an opening at the bottom of the mud storage tank and is connected to the overflow channel outside the mud storage tank; an electromagnetic valve is provided on the overflow pipe, and the electromagnetic valve is electrically connected to the controller.

[0017] Preferably, the separation method of the automatic drainage separation device for supernatant liquid in the sludge storage tank of the sewage treatment plant comprises the following steps: S1, fix the separation tube on the fence of the sludge storage tank by a traction rope, and then lower the separation tube to the surface of the supernatant in the sludge storage tank that has been precipitated and separated, so that the separation tube is attached to the water surface; set the warning threshold △H of the liquid level sensor; S2, adjust the counterweight adjustment device through the controller so that the lower 1 / 3 of the separation tube is below the liquid surface. The specific method is as follows: If the liquid level sensor does not detect the liquid level signal, it indicates that the buoyancy of the separation tube is too large. The controller increases the voltage of the power supply to increase the magnetic force between the electromagnet and the magnetic base, thereby moving the separation tube downward until the liquid level sensor detects the liquid level signal. If the liquid level sensor detects a liquid level signal, but the liquid level reading exceeds the warning threshold △H, it indicates that the buoyancy of the separation tube is too small and the counterweight is too heavy. The controller reduces the voltage of the power supply to reduce the magnetic force between the electromagnet and the magnetic base, thereby moving the separation tube upward under the action of buoyancy until the liquid level sensor detects that the liquid level signal does not exceed the warning threshold △H; S3, after adjusting the height of the separation tube, the controller controls the solenoid valve to open, at which time the upper clear liquid enters the separation tube from the drainage hole, and then flows through the overflow pipe at the bottom along the two drainage hoses under the action of gravity potential energy, and finally drains to the outside of the mud storage tank; S4, during the overflow process, the controller collects the signal of the liquid level sensor in real time and adjusts the position of the separation tube in real time until the overflow is completed; the plugs at both ends of the separation tube are removed and the inner wall is cleaned.

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

[0019] Furthermore, the power supply is a positive and negative adjustable power supply, so that the magnetism of the electromagnet can be changed. When there are too many debris in the separation tube and the weight is too large, even if the magnetic attraction is reduced, it cannot float to the predetermined position under its own buoyancy, and its floating can be achieved through magnetic repulsion.

[0020] The beneficial effects of the automatic drainage and separation device for supernatant liquid in the sludge storage tank of the sewage treatment plant are as follows: 1. The device solves the problems of the upper clear liquid in the gravity separation mud storage tank in the prior art that it is difficult to discharge cleanly, the discharge process is cumbersome, and the effect is poor. It can automatically adjust the overflow port position as the liquid level changes, thereby realizing fully automated overflow, and the upper clear liquid can be discharged cleanly, and the overall cost is low.

[0021] 2. The device is provided with a counterweight adjustment device which can adjust the floating height of the separation tube, so that automatic position adjustment can be achieved through sensors, avoiding errors caused by human eye observation, so that the entire separation tube is always at the optimal height position during the entire overflow process, no matter how the liquid level changes, to ensure the separation effect; the counterweight adjustment device also enables the device to adapt to different water bodies and working conditions. When the buoyancy of the water changes, or the buoyancy of the separation tube changes due to siltation and debris inside the separation tube, the counterweight adjustment device can be automatically adjusted, so that the device as a whole has good adaptability. Compared with the prior art that can only open an overflow port at a fixed height on the pool wall, the flexibility of this device has been greatly improved.

[0022] 3. The structure of the device is simple, the manufacturing cost is very low, and there is no need to make too many modifications to the mud storage tank. It is suitable for development on the basis of existing technology and can cleverly solve big problems at a very low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of a magnetic base in an embodiment of the present invention; Figure 3It is a schematic diagram of the connection block diagram of electrical components in an embodiment of the present invention; The reference numerals in the figure are: separation tube 1, traction rope 2, drainage hose 3, three-way valve 4, support rod 41, overflow pipe 5, solenoid valve 51, controller 6, drainage hole 7, magnetic base 8, liquid level sensor 81, electromagnet 9, bottom wall of mud storage tank 10, power supply 11. DETAILED DESCRIPTION

[0024] Embodiment 1: like Figure 1 As shown, the automatic drainage and separation device of the supernatant in the sludge storage tank of the sewage treatment plant includes a separation tube 1, which is fixed to the fence of the sludge storage tank by a traction rope 2; the separation tube 1 is a hollow tubular structure, and the two ends of the separation tube 1 are connected with drainage hoses 3, 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 tube 1 is connected with a counterweight adjustment device, and the counterweight adjustment device is electrically connected to the controller 6.

[0025] Preferably, both ends of the separation tube 1 are open, threads are provided in the openings to be threadedly connected with the plug, and a sealing ring is provided on the connection surface for sealing.

[0026] Preferably, a hole is opened on the surface of the plug, and the top end of the drainage hose 3 passes through the hole on the surface of the plug and is interference fit with the inner wall of the hole of the plug to achieve sealing, and the top end of the drainage hose 3 extends to the inside of the separation tube 1.

[0027] Furthermore, the opening on the surface of the plug is located at the lower 1 / 3.

[0028] Preferably, the separation tube 1 is placed horizontally and floats on the surface of the supernatant in the mud storage tank, and a plurality of drainage holes 7 are provided on the side surface of the separation tube 1 from 1 / 3 height to 2 / 3 height from top to bottom.

[0029] Furthermore, the horizontal distance is 5 cm, the layer distance is 3 rows, and the hole diameter is 8 mm.

[0030] Preferably, a cylindrical steel wire filter is embedded in the inner wall of the separation tube 1 and cooperates with the drainage hole 7 .

[0031] 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.

[0032] Preferably, two groups of liquid level sensors 81 are connected to both sides of the magnetic base through brackets.

[0033] Preferably, the counterweight adjustment device also includes a support rod 41 connected to the outer surface of the three-way valve 4, and a bar-shaped electromagnet 9 is connected to the top of the support rod 41 to cooperate with the magnetic base 8. The electromagnet 9 is electrically connected to a variable pressure power supply 11, and the power supply 11 is electrically connected to the controller 6.

[0034] Preferably, one end of the overflow pipe 5 is connected to the three-way valve 4, and the other end passes through an opening at the bottom of the mud storage tank and is connected to the overflow channel outside the mud storage tank; an electromagnetic valve 51 is provided on the overflow pipe 5, and the electromagnetic valve 51 is electrically connected to the controller 6.

[0035] Embodiment 2: like Figure 3 As shown, the separation method of the automatic drainage separation device for the supernatant of the sludge storage tank of the sewage treatment plant comprises the following steps: S1, fix the separation tube 1 on 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 liquid in the sludge storage tank that has been precipitated 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; S2, adjusting the counterweight adjustment device through 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: If the liquid level sensor 81 does not detect a liquid level signal, it indicates that the buoyancy of the separation tube 1 is too large, and 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 a liquid level signal; 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 the buoyancy until the liquid level sensor 81 detects that the liquid level signal does not exceed the warning threshold △H. S3, after adjusting the height of the separation tube 1, the controller 6 controls the solenoid valve 51 to open, and the upper clear liquid enters the separation tube 1 from the drainage hole 7, and then flows through the overflow pipe 5 at the bottom along the two drainage hoses 3 under the action of gravity potential energy, and finally drains to the outside of the mud storage tank; S4, during the overflow process, the controller 6 collects the signal of the liquid level sensor 81 in real time, and adjusts the position of the separation tube 1 in real time until the overflow is completed; the plugs at both ends of the separation tube 1 are removed and the inner wall is cleaned.

[0036] Furthermore, the bottom of the magnetic base 8 is a planar structure, and the surface on the opposite side of the electromagnet 9 is also a planar structure, which can prevent the separation tube 1 from turning over.

[0037] Furthermore, the power supply 11 is a positive and negative adjustable power supply 11, so that the magnetism of the electromagnet 9 can be changed. When there are too many debris in the separation tube 1 and the weight is too large, even if the magnetic attraction is reduced, it cannot float to the predetermined position under its own buoyancy, and its floating can be achieved through magnetic repulsion.

[0038] The above-mentioned embodiments are only preferred technical solutions of the present invention and should not be regarded as limitations of the present invention. The embodiments and features in the embodiments of the present application can be arbitrarily combined with each other without conflict. The protection scope of the present invention shall be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. Automatic drainage and separation device for supernatant liquid in sludge storage tank of sewage treatment plant, characterized by: The invention comprises a separation pipe (1), wherein the separation pipe (1) is fixed to the fence of the mud storage tank via a traction rope (2); the separation pipe (1) is a hollow tubular structure, and drainage hoses (3) are connected to both ends of the separation pipe (1), and the bottom ends of the two drainage hoses (3) are connected to an overflow pipe (5) via a three-way valve (4); and a counterweight adjustment device is connected to the bottom end of the separation pipe (1), and the counterweight adjustment device is electrically connected to a controller (6).

2. The automatic drainage and separation device for supernatant liquid in a sludge storage tank of a sewage treatment plant according to claim 1 is characterized by: The separation tube (1) has openings at both ends, with threads provided in the openings for threaded connection with the plug, and a sealing ring provided on the connection surface for sealing.

3. The automatic drainage and separation device for supernatant liquid in a sludge storage tank of a sewage treatment plant according to claim 2 is characterized by: The plug has a hole on its surface, and the top end of the drainage hose (3) passes through the hole on the plug surface and is interference-fitted with the inner wall of the plug hole to achieve sealing, and the top end of the drainage hose (3) extends to the interior of the separation tube (1).

4. The automatic drainage and separation device for supernatant liquid in a sludge storage tank of a sewage treatment plant according to claim 1 is characterized by: The separation tube (1) is placed horizontally and floats on the surface of the supernatant in the mud storage tank. A plurality of drainage holes (7) are provided on the side surface of the separation tube (1) from 1 / 3 of the height to 2 / 3 of the height from the top to the bottom.

5. The automatic drainage and separation device for supernatant liquid in a sludge storage tank of a sewage treatment plant according to claim 4 is characterized by: A cylindrical steel wire filter screen is embedded in the inner wall of the separation tube (1) and cooperates with the drainage hole (7).

6. The automatic drainage and separation device for supernatant liquid in a sludge storage tank of a sewage treatment plant according to claim 1 is characterized by: The counterweight adjustment device comprises a magnetic base (8), the magnetic base (8) being a magnet with an arc-shaped plate structure, and the magnetic base (8) being fixed to the lower 1 / 3 area of ​​the side surface of the separation tube (1) by means of a clamp.

7. The automatic drainage and separation device for supernatant liquid in a sludge storage tank of a sewage treatment plant according to claim 6 is characterized by: Two groups of liquid level sensors (81) are connected to both sides of the magnetic base (8) via brackets.

8. The automatic drainage and separation device for supernatant liquid in a sludge storage tank of a sewage treatment plant according to claim 7 is characterized by: The counterweight adjustment device further comprises a support rod (41) connected to the outer surface of the three-way valve (4), a bar-shaped 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).

9. The automatic drainage and separation device for supernatant liquid in a sludge storage tank of a sewage treatment plant 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 an opening at the bottom of the mud storage tank and is connected to an overflow channel outside the mud 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).

10. The separation method according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, fixing the separation tube (1) on the fence of the sludge storage tank by means of a traction rope (2), and then lowering the separation tube (1) to the surface of the supernatant liquid in the sludge storage tank that has been precipitated and separated, so that the separation tube (1) is attached to the water surface; setting the warning threshold △H of the liquid level sensor (81); S2, adjust the counterweight adjustment device through the controller so that the lower 1 / 3 of the separation tube is below the liquid surface. The specific method is as follows: If the liquid level sensor (81) does not detect a liquid level signal, it indicates that the buoyancy of the separation tube (1) is too large, and the controller (6) increases the voltage of the power supply 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 a liquid level signal; 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 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 the buoyancy until the liquid level sensor (81) detects that the liquid level signal does not exceed the warning threshold △H. S3, after adjusting the height of the separation tube (1), the controller (6) controls the solenoid valve (51) to open, and the upper clear liquid enters the separation tube (1) from the drainage hole (7), and then flows through the overflow pipe (5) at the bottom along the two drainage hoses (3) under the action of gravitational potential energy, and finally drains to the outside of the mud storage tank; S4, during the overflow process, the controller (6) collects the signal of the liquid level sensor (81) in real time, and adjusts the position of the separation tube (1) in real time until the overflow is completed; the plugs at both ends of the separation tube (1) are removed, and the inner wall is cleaned.

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