Efficient sludge thickening tank system

Abstract

The utility model discloses an efficient sludge thickening tank system. The efficient sludge thickening tank system comprises a sludge thickening unit, a chemical adding unit and a sludge discharging unit, the sludge thickening unit comprises a sludge inlet pipe and a thickening tank, the interior of the thickening tank is sequentially composed of a clear water area, a settling area, a thickening area and a sludge hopper area from top to bottom, and one side of the clear water area is connected with the sludge inlet pipe; the dosing unit is arranged on the sludge inlet pipe, and the sludge discharge unit is connected with the sludge bucket area through a sludge discharge pipe. Through a PLC automatic control system, continuous sludge feeding, concentration, water drainage and sludge discharge can be automatically realized, and field operation by a specially-assigned person is not needed.

Description

Technical Field

[0001] This utility model relates to the field of sludge treatment technology in wastewater treatment plants, and specifically to a high-efficiency sludge thickening tank system. Background Technology

[0002] Wastewater treatment plants generate a large amount of biological and physical-chemical sludge during the wastewater treatment process. The sludge has a high moisture content, generally above 99.2% for biological sludge and about 98-99% for physical-chemical sludge. Wastewater treatment plants that require deep sludge dewatering should first thicken the sludge and then dewater it until the moisture content meets the standards for off-site transportation before it is transported for disposal.

[0003] In existing technologies, wastewater treatment plants typically use sludge storage tanks, gravity thickeners, air flotation thickeners, or mechanical thickeners for concentration before dewatering. Sludge storage tanks are generally rectangular, with short retention times and no thickening function, resulting in low solids content in the sludge and consequently low dewatering efficiency. Gravity thickeners are generally circular, and while they thicken sludge, their long retention time leads to anaerobic phosphorus release, reducing the total phosphorus removal rate of the wastewater treatment plant, wasting phosphorus removal agents, and requiring significant investment and land area. Air flotation thickening separates sludge particles by adsorbing them onto microbubbles, suitable for low-density activated sludge. Its thickening efficiency is higher than gravity, but it consumes more energy and requires careful control of bubble stability; its current application is relatively low, mainly used for special sludge types. Mechanical thickeners do not exhibit anaerobic phosphorus release, but they consume more energy and are prone to malfunctions, affecting dewatering efficiency.

[0004] In summary, due to the gradual change in sludge disposal methods at wastewater treatment plants, the moisture content of sludge transported from these plants has changed from ≤80% to ≤60%. Sludge dewatering methods have also shifted from conventional methods like screw press dewatering, belt dewatering, and centrifugal dewatering to deeper dewatering methods such as plate and frame filter press or drying dewatering. Therefore, there is an urgent need to develop a high-efficiency sludge thickening tank that is highly efficient, low-energy, and does not cause anaerobic phosphorus release. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a high-efficiency sludge thickening tank system. This sludge thickening tank system features rapid sludge thickening, low operating energy consumption, no anaerobic phosphorus release, and low investment and operating costs.

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

[0007] This utility model provides a high-efficiency sludge thickening tank system for the thickening treatment of excess sludge. The high-efficiency sludge thickening tank system includes a sludge thickening unit, a chemical dosing unit, and a sludge discharge unit. The sludge thickening unit includes a sludge inlet pipe and a thickening tank. The thickening tank is composed of a clear water zone, a sedimentation zone, a thickening zone, and a sludge hopper zone from top to bottom. The sludge inlet pipe is connected to one side of the clear water zone.

[0008] The dosing unit is installed on the mud inlet pipe, and the mud discharge unit is connected to the mud hopper area through the mud discharge pipe.

[0009] Furthermore, the dosing unit includes a mixer, a dosing pump, and a dissolving and mixing device. The sludge inlet pipe includes a first sludge inlet pipe and a second sludge inlet pipe. One side of the mixer is connected to the sludge outlet of the first sludge inlet pipe, and the other side is connected to the sludge inlet of the second sludge inlet pipe. The sludge inlet of the first sludge inlet pipe is connected to the sludge outlet of the wastewater treatment plant's excess sludge discharge pipe, and the sludge outlet of the second sludge inlet pipe is connected to one side of the clear water zone. The inlet of the dosing pump is connected to the dissolving and mixing device through a dosing pipe, and the outlet of the dosing pump is connected to the top of the mixer through a dosing pipe.

[0010] Furthermore, the sludge discharge unit also includes a sludge discharge pump, and the sludge discharge pipe includes a first sludge discharge pipe and a second sludge discharge pipe. The inlet of the sludge discharge pump is connected to the sludge outlet of the first sludge discharge pipe, and the outlet is connected to the sludge inlet of the second sludge discharge pipe. The sludge inlet of the first sludge discharge pipe is connected to the sludge hopper area.

[0011] Furthermore, it also includes an automatic decanter, the top of which is located at the top of the thickening tank on the side away from the sludge inlet pipe, and the bottom is located in the clear water zone and connected to the drain pipe, which is located on the other side of the clear water zone.

[0012] Furthermore, it also includes an ultrasonic level gauge and a sludge interface meter installed at the top of the thickening tank. The ultrasonic level gauge is used to monitor the supernatant level in real time, and the sludge interface meter is used to detect the sludge level in real time.

[0013] Furthermore, it also includes a sludge inlet center cylinder located in the middle of the thickening tank. The sludge inlet end on one side of the sludge inlet center cylinder is connected to the sludge outlet end of the second row of sludge pipes. The sludge outlet end of the sludge inlet center cylinder is located at the bottom of the sludge inlet center cylinder and extends into the top of the sedimentation zone. The bottom of the sludge inlet center cylinder is a 45° funnel shape.

[0014] Furthermore, a reflector is provided at the bottom of the mud inlet center cylinder, with the angle between the inclined surface of the reflector and the horizontal plane being 17°.

[0015] Furthermore, the diameter and height of the funnel opening of the mud inlet center cylinder are both 1.35 times the diameter of the mud inlet center cylinder, and the diameter of the reflector plate is 1.30 times the diameter of the funnel opening.

[0016] Furthermore, the walls of the concentration zone are inclined inward at 45° to 60°.

[0017] The beneficial effects of this utility model are:

[0018] 1. This utility model can automatically realize continuous sludge feeding, thickening, drainage and sludge discharge through a PLC automatic control system, without the need for dedicated personnel to operate on site.

[0019] 2. This utility model greatly improves the sludge sedimentation and thickening efficiency by installing a dosing pipe mixer on the sludge inlet pipe and adding flocculant, thereby increasing the sludge concentration in the sludge thickening tank and further improving the working efficiency of the subsequent sludge dewatering machine.

[0020] 3. This utility model automatically drains water through an automatic decanter, allowing for continuous sludge intake and discharge, saving the volume of the sludge thickening tank and reducing construction investment.

[0021] 4. This utility model improves the sedimentation and concentration efficiency of sludge, avoids anaerobic phosphorus release due to prolonged retention inside the sludge thickening tank, and can save on the amount of chemical phosphorus removal agents used. Attached Figure Description

[0022] Figure 1 A schematic diagram of the overall structure of a high-efficiency sludge thickening tank system;

[0023] In the diagram, 1. Sludge thickening unit; 11. Sludge inlet pipe; 111. First sludge inlet pipe; 112. Second sludge inlet pipe; 12. Thickening tank; 121. Clear water zone; 122. Sedimentation zone; 123. Thickening zone; 124. Sludge hopper zone; 2. Chemical dosing unit; 21. Mixer; 22. Chemical dosing pump; 23. Chemical dissolving and preparation device; 24. Chemical dosing pipe; 3. Sludge discharge unit; 31. Sludge discharge pipe; 311. First sludge discharge pipe; 312. Second sludge discharge pipe; 32. Sludge discharge pump; 4. Automatic decanter; 5. Drain pipe; 6. Ultrasonic level gauge; 7. Sludge interface meter; 8. Sludge inlet center cylinder; 9. Reflector plate. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to specific embodiments, so that those skilled in the art can understand it.

[0025] Combination Figure 1As shown, a high-efficiency sludge thickening tank system is used for the thickening treatment of excess sludge. The high-efficiency sludge thickening tank system includes a sludge thickening unit 1, a chemical dosing unit 2, and a sludge discharge unit 3. The sludge thickening unit 1 includes a sludge inlet pipe 11 and a thickening tank 12. The thickening tank 12 is composed of a clear water zone 121, a sedimentation zone 122, a thickening zone 123, and a sludge hopper zone 124 from top to bottom. The sludge inlet pipe 11 is connected to one side of the clear water zone 121. The chemical dosing unit 2 is installed on the sludge inlet pipe 11, and the sludge discharge unit 3 is connected to the sludge hopper zone 124 through the sludge discharge pipe 31. 24 are connected; in this way, the sludge inlet pipe 11 is connected to the wastewater treatment plant's wastewater sludge discharge pipe, and the wastewater sludge enters the thickening tank 12 through the sludge inlet pipe 11. At the same time, the dosing unit 2 adds flocculant to the wastewater sludge in the sludge inlet pipe 11. The flocculant and the wastewater sludge enter the thickening tank 12 together. The wastewater sludge undergoes natural sedimentation in the sedimentation zone 122. The settled wastewater sludge enters the thickening zone 123 for further thickening. The thickened wastewater sludge enters the sludge hopper zone 124. The wastewater sludge is discharged through the sludge discharge unit 3 and discharged into the sludge dewatering machine.

[0026] The dosing unit 2 includes a mixer 21, a dosing pump 22, and a dissolving and mixing device 23. The sludge inlet pipe 11 includes a first sludge inlet pipe 111 and a second sludge inlet pipe 112. One side of the mixer 21 is connected to the sludge outlet of the first sludge inlet pipe 111, and the other side is connected to the sludge inlet of the second sludge inlet pipe 112. The sludge inlet of the first sludge inlet pipe 111 is connected to the sludge outlet of the wastewater treatment plant's excess sludge discharge pipe, and the sludge outlet of the second sludge inlet pipe 112 is connected to one side of the clear water zone 121. The inlet of the dosing pump 22 is connected to the dissolving and mixing device 23 via a dosing pipe 24. The outlet of the dosing pump 22 is connected to the top of the mixer 21 via the dosing pipe 24. In this way, flocculant is added to the dissolving and preparation device 23, and through the dosing pump 22, the flocculant enters the mixer 21 through the dosing pipe 24, where it mixes evenly with the remaining sludge in the mixer 21 and enters the thickening tank 12 together. The addition of flocculant improves the sludge sedimentation and thickening efficiency, thereby increasing the sludge concentration in the remaining sludge in the sludge hopper 124. Furthermore, the signals of the dissolving and preparation device 23 and the dosing pump 22 are both connected to the automatic control system, which can automatically control the operation.

[0027] The sludge discharge unit 3 also includes a sludge discharge pump 32, and a sludge discharge pipe 31 including a first sludge discharge pipe 311 and a second sludge discharge pipe 312. The inlet of the sludge discharge pump 32 is connected to the sludge outlet of the first sludge discharge pipe 311, and the outlet is connected to the sludge inlet of the second sludge discharge pipe 312. The sludge inlet of the first sludge discharge pipe 311 is connected to the sludge hopper area 124. In this way, the sludge discharge pump 32 discharges the remaining sludge in the sludge hopper area 124 to the sludge dewatering machine for further processing. The sludge discharge pump 32 is also connected to the automatic control system, which can automatically control its operation.

[0028] The high-efficiency sludge thickening tank system also includes an automatic decanter 4. The top of the automatic decanter 4 is located at the top of the thickening tank 12 on the side away from the sludge inlet pipe 11, and the bottom is located in the clear water zone 121 and connected to the drain pipe 5, which is located on the other side of the clear water zone 121. In this way, when the supernatant level in the thickening tank 12 is too high, the automatic decanter 4 starts to automatically drain water, and the water after the remaining sludge has settled and thickened is discharged through the drain pipe 5. Furthermore, the automatic decanter 4 is connected to an automatic control system, which can automatically control its operation.

[0029] The high-efficiency sludge thickening tank system also includes an ultrasonic level gauge 6 and a sludge interface meter 7 installed at the top of the thickening tank 12. The ultrasonic level gauge 6 is used to monitor the supernatant level in real time, and the sludge interface meter 7 is used to detect the sludge level in real time. The signals of the ultrasonic level gauge 6 and the sludge interface meter 7 are both connected to the automatic control system, which can automatically control the operation.

[0030] The high-efficiency sludge thickening tank system also includes a sludge inlet central cylinder 8 located in the middle of the thickening tank 12. The sludge inlet end located on one side of the sludge inlet central cylinder 8 is connected to the sludge outlet end of the second sludge inlet pipe 112. The sludge outlet end of the sludge inlet central cylinder 8 is located at the bottom of the sludge inlet central cylinder 8 and extends into the top of the sedimentation zone 122. The bottom of the sludge inlet central cylinder 8 is in the shape of a 45° funnel. In this way, the remaining sludge enters the sludge inlet central cylinder 8 and is evenly discharged into the thickening tank 12. The 45° funnel shape at the bottom of the sludge inlet central cylinder 8 is conducive to the discharge of sludge.

[0031] A reflector plate 9 is installed at the bottom of the sludge inlet center cylinder 8. The angle between the inclined surface of the reflector plate 9 and the horizontal plane is 17°. In this way, the reflector plate 9 can eliminate the influence of the sludge inlet on the sedimentation of the remaining sludge. The remaining sludge settles in the sedimentation zone 122. The reflector plate 9 can also prevent the excess remaining sludge in the thickening tank 12 from returning to the sludge inlet center cylinder 8.

[0032] The diameter and height of the funnel mouth of the sludge inlet center cylinder 8 are both 1.35 times the diameter of the cylinder itself, and the diameter of the reflector plate 9 is 1.30 times the diameter of the funnel mouth. In this way, the sludge outlet of the sludge inlet center cylinder 8 is funnel-shaped, which is conducive to the rapid discharge of sludge and avoids the phenomenon of sludge discharge jamming.

[0033] The walls of the thickening zone 123 are inclined inward at 45° to 60°. In this way, the remaining sludge enters the thickening zone 123 after sedimentation, which is conducive to the settling and thickening of the remaining sludge. After thickening, it enters the sludge hopper zone 124.

[0034] In practical use, the high-efficiency sludge thickening tank system of this utility model combines... Figure 1 As shown:

[0035] After the high-efficiency sludge thickening tank system is installed, the wastewater treatment plant discharges the high-moisture-content excess sludge into the first sludge inlet pipe 111. After the sludge is fully mixed with the sludge flocculant by the mixer 21 on the sludge inlet pipe 11, it enters the sludge inlet central cylinder 8 through the second sludge inlet pipe 112. The mixed excess sludge is evenly distributed into the sedimentation zone 122 through the sludge inlet central cylinder 8. A reflector plate 9 is installed at the bottom of the sludge inlet central cylinder 8 to eliminate the influence of the sludge inlet on the sludge sedimentation. The excess sludge undergoes natural sedimentation in the sedimentation zone 122. The settled excess sludge enters the thickening zone 123 for further thickening. The thickened excess sludge enters the sludge hopper zone 124. The thickened excess sludge is discharged into the dewatering machine in the sludge dewatering room through the first sludge discharge pipe 311, the sludge discharge pump 32, and the second sludge discharge pipe 312. After the mud and water are separated, the supernatant is collected by the automatic decanter 4 in the clear water zone 121 and discharged through the drain pipe 5 into the sewage inspection well inside the sewage treatment plant, where it flows into the coarse screen pump station and enters the sewage treatment system.

[0036] When the ultrasonic level gauge 6 detects that the liquid level in the thickener 12 is lower than the designed low level, the wastewater treatment plant's excess sludge pump automatically starts, and sludge begins to enter the thickener 12, while the chemical mixing device 23 and the dosing pump 22 automatically activate. When the ultrasonic level gauge 6 detects that the liquid level in the thickener 12 reaches the designed high level, the wastewater treatment plant's excess sludge pump, chemical mixing device 23, and dosing pump 22 automatically stop. When the sludge interface meter 7 displays that the sludge level is lower than the minimum achievable level of the automatic decanter 4, the automatic decanter 4 starts to automatically drain water. When the sludge interface meter 7 displays that the interface height is higher than the minimum achievable level of the automatic decanter 4, the automatic decanter 4 automatically stops draining water and returns to its highest point.

[0037] All other parts not described in detail are existing technologies. Although the above embodiments provide a detailed description of the present invention, they are only some embodiments of the present invention, not all embodiments. People can obtain other embodiments based on this embodiment without creative effort, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A high-efficiency sludge thickening tank system for treating excess sludge, characterized in that: The high-efficiency sludge thickening tank system includes a sludge thickening unit (1), a dosing unit (2), and a sludge discharge unit (3). The sludge thickening unit (1) includes a sludge inlet pipe (11) and a thickening tank (12). The thickening tank (12) consists of a clear water zone (121), a sedimentation zone (122), a thickening zone (123), and a sludge hopper zone (124) from top to bottom. The sludge inlet pipe (11) is connected to one side of the clear water zone (121). The dosing unit (2) is installed on the mud inlet pipe (11), and the mud discharge unit (3) is connected to the mud hopper area (124) through the mud discharge pipe (31).

2. The high-efficiency sludge thickening tank system according to claim 1, characterized in that: The dosing unit (2) includes a mixer (21), a dosing pump (22), and a dissolving and mixing device (23). The sludge inlet pipe (11) includes a first sludge inlet pipe (111) and a second sludge inlet pipe (112). One side of the mixer (21) is connected to the sludge outlet of the first sludge inlet pipe (111), and the other side is connected to the sludge inlet of the second sludge inlet pipe (112). The sludge inlet of the first sludge inlet pipe (111) is connected to the sludge outlet of the wastewater treatment plant's residual sludge discharge pipe, and the sludge outlet of the second sludge inlet pipe (112) is connected to one side of the clear water zone (121). The inlet of the dosing pump (22) is connected to the dissolving and mixing device (23) through the dosing pipe (24), and the outlet of the dosing pump (22) is connected to the top of the mixer (21) through the dosing pipe (24).

3. The high-efficiency sludge thickening tank system according to claim 2, characterized in that: The sludge discharge unit (3) also includes a sludge discharge pump (32), and the sludge discharge pipe (31) includes a first sludge discharge pipe (311) and a second sludge discharge pipe (312). The inlet of the sludge discharge pump (32) is connected to the sludge outlet of the first sludge discharge pipe (311), and the outlet is connected to the sludge inlet of the second sludge discharge pipe (312). The sludge inlet of the first sludge discharge pipe (311) is connected to the sludge hopper area (124).

4. The high-efficiency sludge thickening tank system according to claim 3, characterized in that: It also includes an automatic decanter (4), the top of which is located on the top of the thickening tank (12) away from the sludge inlet pipe (11), and the bottom is located in the clear water zone (121) and connected to the drain pipe (5), which is located on the other side of the clear water zone (121).

5. The high-efficiency sludge thickening tank system according to claim 4, characterized in that: It also includes an ultrasonic level gauge (6) and a sludge interface meter (7) installed on top of the thickening tank (12). The ultrasonic level gauge (6) is used to monitor the supernatant level in real time, and the sludge interface meter (7) is used to detect the sludge level in real time.

6. The high-efficiency sludge thickening tank system according to claim 5, characterized in that: It also includes a sludge inlet center cylinder (8) set in the middle of the thickening tank (12), with the sludge inlet end on one side of the sludge inlet center cylinder (8) connected to the sludge outlet end of the second sludge inlet pipe (112). The sludge outlet end of the sludge inlet center cylinder (8) is located at the bottom of the sludge inlet center cylinder (8) and extends into the top of the sedimentation zone (122). The bottom of the sludge inlet center cylinder (8) is a 45° funnel shape.

7. The high-efficiency sludge thickening tank system according to claim 6, characterized in that: The bottom of the mud inlet center cylinder (8) is provided with a reflector plate (9), and the angle between the inclined surface of the reflector plate (9) and the horizontal plane is 17°.

8. The high-efficiency sludge thickening tank system according to claim 7, characterized in that: The diameter and height of the flared mouth of the mud inlet center cylinder (8) are both 1.35 times the diameter of the cylinder (8), and the diameter of the reflector plate (9) is 1.30 times the diameter of the flared mouth.

9. The high-efficiency sludge thickening tank system according to claim 8, characterized in that: The walls of the concentration zone (123) are inclined inward at 45° to 60°.

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