A micro-power coagulation and sedimentation device for secondary effluent of a sewage treatment plant

Abstract

The utility model provides a kind of secondary effluent micro-power coagulation sedimentation's disposal device of sewage treatment plant, multiple function areas are provided in this disposal device, PAC dosing device, PAM dosing device, folded plate flocculation zone, sludge sedimentation zone and coagulation zone are connected by pipeline or partition, the depth treatment of secondary effluent of sewage treatment plant is realized.At the same time, the utility model uses folded plate flocculation mode and inclined-tube sedimentation mode, and the specified function can be completed without electrical equipment, and the power cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a treatment device for micro-dynamic coagulation and sedimentation of secondary effluent from wastewater treatment plants. Background Technology

[0002] Domestic sewage generated in cities typically needs to be collected through sewage pipe networks and treated at sewage treatment plants. Sewage treatment plants generally employ a three-stage treatment process: primary treatment often involves screens and grit chambers; secondary treatment is often biological treatment; and tertiary treatment, also known as advanced treatment, builds upon primary and secondary treatment by using chemical and physicochemical methods to further remove other impurities from the sewage, achieving reuse standards. Its main purpose is to further remove pollutants such as nitrogen, phosphorus, fine suspended solids, trace organic matter, and inorganic salts from the sewage, resulting in better and more stable effluent quality. Depending on the pollutants being removed, tertiary treatment processes are typically divided into biological denitrification, coagulation sedimentation, sand filtration, and activated carbon filtration. For issues with high suspended solids in secondary sedimentation tank effluent, coagulation sedimentation is often used. This method often involves coagulation mixers, flocculation mixers, and sludge scrapers, incurring certain electricity costs. Therefore, improving conventional coagulation sedimentation processes and further reducing operating costs are issues that need to be considered. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model provides a micro-powered coagulation and sedimentation treatment device for secondary effluent from wastewater treatment plants. This treatment device, by setting up multiple functional zones, connects the PAC dosing device, PAM dosing device, folded plate flocculation zone, sludge sedimentation zone, and coagulation zone through pipes or partitions, to achieve deep treatment of secondary effluent from wastewater treatment plants. At the same time, it adopts folded plate flocculation and inclined tube sedimentation methods, and can complete the intended functions without additional electrical equipment, thereby reducing electricity costs.

[0004] To achieve the above-mentioned technical features, the purpose of this utility model is as follows: a treatment device for micro-powered coagulation and sedimentation of secondary effluent from a wastewater treatment plant, comprising a PAC dosing device, a PAM dosing device, a folded plate flocculation zone, a sludge sedimentation zone, and a coagulation zone; the coagulation zone and the folded plate flocculation zone are connected by a partition with openings, the folded plate flocculation zone and the sludge sedimentation zone are connected by a partition with openings, the PAC dosing device and the coagulation zone are connected by a pipeline; the PAM dosing device and the folded plate flocculation zone are connected by a pipeline.

[0005] Preferably, the PAC dosing device includes a PAC dissolving tank, a PAC mixer, a PAC dosing pump, and a PAC vent valve. One side of the PAC dosing pump is connected to the coagulation zone, and the other side is connected to the PAC dissolving tank. One side of the PAC vent valve is connected to the PAC dissolving tank, and the other side is connected to the vent main pipe.

[0006] Preferably, the PAM dosing device includes a PAM dissolving tank, a PAM mixer, a PAM dosing pump, and a PAM vent valve. One side of the PAM dosing pump is connected to the baffle flocculation zone, and the other side is connected to the PAM dissolving tank. One side of the PAM vent valve is connected to the PAM dissolving tank, and the other side is connected to the vent main pipe.

[0007] Preferably, a double-blade mixer is installed inside the coagulation zone, a submerged water inlet is installed in the lower left corner of the coagulation zone, and a baffle flocculation zone water inlet is installed in the upper right corner; a flow meter is installed inside the coagulation zone.

[0008] The rotation speed of the double-blade mixer is 0-80 rpm.

[0009] Preferably, the folded plate flocculation zone uses vertical flow folded plates of the same wave to form vortices of different sizes;

[0010] The folded plate flocculation zone is equipped with a reaction zone vent valve, which is connected to the vent main pipe.

[0011] Preferably, the sludge settling zone uses inclined tube packing, and the sludge is collected by perforated sludge pipes in the sludge settling zone. The sludge is discharged by water pressure difference, eliminating the need for sludge discharge pump power equipment.

[0012] The perforated sludge pipe is provided with perforated openings;

[0013] The sludge settling area is equipped with multiple electric sludge valves, which are connected to the venting main.

[0014] Preferably, the inlet of the folded plate flocculation zone is located in the middle of the first corridor of the folded plate flocculation zone.

[0015] Preferably, the sludge settling zone is connected via a sludge settling zone inlet, and the sludge settling zone inlet is perforated with a partition.

[0016] The sludge sedimentation zone adopts a triangular water collection weir;

[0017] The sludge sedimentation zone is equipped with a water outlet.

[0018] The sludge sedimentation zone is equipped with a sludge level gauge.

[0019] Preferably, both the submerged inlet and outlet adopt flange interfaces, which are universally compatible.

[0020] Preferably, the system also includes a PLC system, wherein the control signal input terminal of the PLC system is connected to a flow meter and a sludge level gauge, and the control signal output terminal of the PLC system is connected to a double-blade mixer, an electric sludge valve, a PAC dosing device, and a PAM dosing device.

[0021] The present invention has the following beneficial effects:

[0022] 1. This utility model sets up a coagulation zone, a folding plate flocculation zone, a sludge sedimentation zone, a PAC dosing device, and a PAM dosing device. In the coagulation zone, the PAC agent reacts with the colloids and suspended particles in the wastewater under the action of the agitator, causing the colloids to destabilize. The destabilized colloids then react with the PAM agent in the folding plate flocculation zone, undergoing adsorption and bridging reactions to form larger flocs. In the sludge sedimentation zone, sludge and water are separated, reducing the concentration of suspended solids in the wastewater and achieving compliant discharge.

[0023] 2. The flocculation zone of this utility model adopts folded plate flocculation, using the flow of influent water as the driving force for flocculation and stirring, eliminating the need for additional stirring devices, thereby reducing electricity costs. The sludge sedimentation zone is equipped with inclined tube packing, which increases the effective sedimentation area, improves sedimentation efficiency and surface load, and reduces the floor space required.

[0024] 3. This utility model collects key data through various sensors, and selects to start or shut down subsequent control devices or equipment under the judgment of the PLC system program to achieve automatic control with high automation. At the same time, the entire sewage treatment process is continuous and efficient. It adopts a skid-mounted container, which highly integrates each treatment unit, occupies a small area, and can be used immediately after installation. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Figure 1 This is a schematic diagram of the structure of one embodiment of the present invention.

[0027] Figure 2 This is a cross-sectional view of one embodiment of the present invention.

[0028] Figure 3 This is a PLC control program logic diagram of one embodiment of the present invention.

[0029] Figure 4 This is one embodiment of the present utility model. Figure 1 Enlarged structural diagram at point A in the middle.

[0030] In the diagram: 1. PAC dosing device, 11. PAC dosing pump, 12. PAC mixer, 13. PAC dissolving tank, 14. PAC vent valve;

[0031] 2. PAM dosing device; 21. PAM dosing pump; 22. PAM mixer; 23. PAM dissolving tank; 24. PAM vent valve.

[0032] 3. Baffle flocculation zone; 31. Vertical flow baffle with the same wave; 32. Vent valve in the reaction zone; 33. Inlet of the baffle flocculation zone.

[0033] 4. Sludge settling zone; 41. Triangular water collection weir; 42. Inclined tube packing; 43. Electric sludge valve; 44. Water outlet; 45. Perforated sludge pipe; 451. Perforated opening; 46. Sludge settling zone inlet; 47. Sludge level gauge.

[0034] 5. Coagulation zone; 51. Double-blade mixer; 52. Submerged inlet; 53. Flow meter;

[0035] 6. PLC system; 7. Vent manifold. Detailed Implementation

[0036] To make the purpose, innovation, application field and operation method of this utility model clearer and more transparent, the utility model will be further described in detail below with reference to the accompanying drawings.

[0037] Example 1:

[0038] like Figure 1 , 2 As shown in Figures 3 and 4, this utility model proposes a micro-powered coagulation and sedimentation treatment device for secondary effluent from a wastewater treatment plant, including a PAC dosing device 1, a PAM dosing device 2, a baffle plate flocculation zone 3, a sludge sedimentation zone 4, and a coagulation zone 5. The coagulation zone 5 and the baffle plate flocculation zone 3 are connected by perforated partitions, the baffle plate flocculation zone 3 and the sludge sedimentation zone 4 are connected by perforated partitions, and the PAC dosing device 1 and the coagulation zone 5 are connected by pipes; the PAM dosing device 2 and the baffle plate flocculation zone 3 are connected by pipes. This treatment device enables advanced treatment of secondary effluent from wastewater treatment plants. Furthermore, this utility model employs baffle plate flocculation and inclined tube sedimentation methods, achieving its intended function without the need for electrical equipment, thus reducing electricity costs.

[0039] Furthermore, the coagulation zone 5 is equipped with a double-blade mixer 51 with a speed of 0-80 rpm. A submerged inlet 52 is located at the lower left corner of the coagulation zone 5, and a baffle flocculation zone inlet 33 is located at the upper right corner, diagonally positioned to avoid short-circuiting. The baffle flocculation tank 3 uses vertical flow baffles 31 with the same wave pattern, which can form vortices of different sizes, promoting the relative movement between floc particles inside the water flow, increasing collision opportunities, and improving the flocculation effect. The sludge sedimentation zone 4 uses inclined tube packing 42 to increase the sedimentation area and improve the sedimentation effect. The sludge sedimentation zone 4 uses perforated sludge pipes 45 to collect sludge, and discharges the sludge using water pressure difference, eliminating the need for power equipment such as sludge pumps.

[0040] In this implementation case, a coagulation zone 5, a folded plate flocculation zone 3, a sludge sedimentation zone 4, a PAC dosing device 1, and a PAM dosing device 2 are set up. In the coagulation zone 5, the PAC agent reacts with the colloids and suspended particles in the wastewater under the action of the agitator, and the colloids are destabilized. The destabilized colloids then react with the PAM agent in the folded plate flocculation zone 3, and the PAM agent reacts with the PAC agent, and the PAM flocs are formed. In the sludge sedimentation zone 4, the sludge and water are separated, the concentration of suspended solids in the wastewater is reduced, and the wastewater is discharged in compliance with standards.

[0041] Furthermore, the folded plate flocculation zone 3 adopts folded plate flocculation, using the influent water flow as the driving force for flocculation and stirring, eliminating the need for additional stirring devices and thus reducing electricity costs. The sludge sedimentation zone 4 is equipped with inclined tube packing 42 to increase the effective sedimentation area, improve sedimentation efficiency and surface load, and reduce the floor space.

[0042] Example 2:

[0043] like Figure 1 , 2 As shown in Figures 3 and 4, this utility model proposes a micro-dynamic coagulation and sedimentation treatment device for secondary effluent from a wastewater treatment plant, including a PAC dosing device 1, a PAM dosing device 2, a folded plate flocculation zone 3, a sludge sedimentation zone 4, and a coagulation zone 5; the coagulation zone 5 and the folded plate flocculation zone 3 are connected by a partition opening, the folded plate flocculation zone 3 and the sludge sedimentation zone 4 are connected by a partition opening, the PAC dosing device 1 and the coagulation zone 5 are connected by a pipeline; the PAM dosing device 2 and the folded plate flocculation zone 3 are connected by a pipeline.

[0044] Furthermore, the coagulation zone 5 is equipped with a double-blade mixer 51 with a speed of 0-80 rpm. A submerged inlet 52 is located at the lower left corner of the coagulation zone 5, and a baffle flocculation zone inlet 33 is located at the upper right corner, diagonally positioned to avoid short-circuiting. The baffle flocculation tank 3 uses vertical flow baffles 31 with the same wave pattern, which can form vortices of different sizes, promoting the relative movement between floc particles inside the water flow, increasing collision opportunities, and improving the flocculation effect. The sludge sedimentation zone 4 uses inclined tube packing 42 to increase the sedimentation area and improve the sedimentation effect. The sludge sedimentation zone 4 uses perforated sludge pipes 45 to collect sludge and discharges it using water pressure difference, eliminating the need for power equipment such as sludge pumps; the perforated sludge pipes 45 are equipped with perforated openings 451.

[0045] like Figure 1 As shown, this device collects key data through various sensors and, under the judgment of the PLC system program, selects to start or shut down subsequent controlled devices or equipment to achieve automatic control. It boasts high automation, and the entire wastewater treatment process is seamless and efficient. Utilizing a skid-mounted container, it highly integrates each treatment unit, occupies a small area, and is ready for immediate use.

[0046] It should be further explained that the inlet 33 of the folded plate flocculation zone is located in the middle of the first corridor of the folded plate flocculation zone 3, which ensures balanced water intake, avoids short circuits, and guarantees the flocculation effect.

[0047] It should be further explained that the folded plate flocculation zone 3 and the sludge sedimentation zone 4 are connected by the sludge sedimentation zone inlet 46. The inlet adopts a baffle opening, which has a small flow velocity and reduces disturbance to the sludge tank.

[0048] It should be further explained that the sludge sedimentation zone 4 adopts a triangular water collection weir 41, which is arranged around the perimeter and collects water in a ring, making the water collection more stable.

[0049] It should be further noted that the submerged inlet 52 of this device uses a flange interface, and the outlet 44 uses a flange interface, which are of universal specifications.

[0050] It should be further noted that, in order to ensure the coagulation effect, this device adds PAC dosing device 1 and PAM dosing device 2.

[0051] It should be further explained that the PAC dosing device 1 includes a PAC dissolving tank 13, a PAC mixer 12, a PAC dosing pump 11, and a PAC vent valve 14. One side of the PAC dosing pump 11 is connected to the coagulation zone 5, and the other side is connected to the PAC dissolving tank 13. One side of the PAC vent valve 14 is connected to the PAC dissolving tank 13, and the other side is connected to the vent main 7. By using the above-mentioned PAC dosing device 1, PAC reagents can be automatically added during wastewater treatment, thereby facilitating automated control.

[0052] It should be further explained that the PAM dosing device 2 includes a PAM dissolving tank 23, a PAM mixer 22, a PAM dosing pump 21, and a PAM vent valve 24. One side of the PAM dosing pump 21 is connected to the baffle flocculation zone 3, and the other side is connected to the PAM dissolving tank 23. One side of the PAM vent valve 24 is connected to the PAM dissolving tank 23, and the other side is connected to the vent manifold 7. By using the above-mentioned PAM dosing device 1, PAM reagent can be automatically added during wastewater treatment, thus facilitating automated control.

[0053] It should be further explained that this device collects the flow and level signals transmitted by the flow meter 53 and the sludge level gauge 47, and outputs commands to the double-blade mixer 51, the electric sludge valve 43, the PAC dosing device 1, and the PAM dosing device 2 under the control of the PLC system 6, thereby realizing the automated operation of the device. The aforementioned PLC system 6 facilitates the subsequent automated control of the entire wastewater treatment process.

[0054] It should be further noted that this device is equipped with a vent valve 32 for the reaction zone, which can be used for venting when the device is not in use.

[0055] Example 3:

[0056] The wastewater treatment method using the micro-dynamic coagulation and sedimentation device for secondary effluent from a wastewater treatment plant, as described in this utility model, comprises the following specific steps:

[0057] S1. The effluent from the biological system of the wastewater treatment plant enters the coagulation zone through a flow meter. The flow meter transmits the flow signal to the PLC system. After receiving the signal, the PLC system automatically turns on the double-blade mixer, PAC dosing device and PAM dosing device. In the PAC dosing device, the PAC mixer and PAC dosing pump are turned on. In the PAM dosing device, the PAM mixer and PAM dosing pump are turned on. The wastewater is fully mixed with the PAC agent under the action of the double-blade mixer. The colloids and particles in the wastewater undergo electrical neutralization, adsorption bridging and other effects with PAC, which makes the colloidal particles lose stability and easy to coagulate and settle.

[0058] S2. The wastewater then enters the folded plate flocculation zone. When the wastewater flows in the folded plate flocculation zone, it will form many small vortices. The small vortices can increase the chance of particle collision and reduce the distance between particles. When the particles get close to each other, they can overcome electrostatic repulsion and cause suspended particles and colloidal substances to collide and aggregate. At the same time, under the bridging and netting effect of PAM agent, larger flocs are gradually formed.

[0059] S3. After the wastewater undergoes flocculation by the baffle plate, it enters the sludge settling zone. Under the action of the inclined tube packing, sludge and water are separated. The supernatant is collected by the triangular water collection weir and discharged through the outlet. The sludge settles in the sludge zone. When the sludge settles to a certain height, the sludge level gauge transmits the signal to the PLC system. The PLC system controls the opening of the electric sludge valve. Under the action of the liquid level difference, the sludge is collected and discharged through the sludge perforated pipe, avoiding long-term accumulation of sludge.

[0060] S4. This device is equipped with a PLC control system and sensors such as flow meters and sludge level gauges. The collected sensor signals are processed by a predetermined program to determine whether to execute the next action, thereby enabling the opening or closing of the PAC dosing device, PAM dosing device, double-blade mixer and electric sludge valve, achieving overall automatic control.

Claims

1. A treatment device for micro-dynamic coagulation and sedimentation of secondary effluent from a wastewater treatment plant, characterized in that, It includes a PAC dosing device (1), a PAM dosing device (2), a folded plate flocculation zone (3), a sludge sedimentation zone (4), and a coagulation zone (5); the coagulation zone (5) and the folded plate flocculation zone (3) are connected by a partition opening, the folded plate flocculation zone (3) and the sludge sedimentation zone (4) are connected by a partition opening, the PAC dosing device (1) and the coagulation zone (5) are connected by a pipeline; the PAM dosing device (2) and the folded plate flocculation zone (3) are connected by a pipeline.

2. The wastewater treatment plant secondary effluent micro-dynamic coagulation and sedimentation device according to claim 1, characterized in that: The PAC dosing device (1) includes a PAC dissolving tank (13), a PAC mixer (12), a PAC dosing pump (11), and a PAC vent valve (14). One side of the PAC dosing pump (11) is connected to the coagulation zone (5), and the other side is connected to the PAC dissolving tank (13). One side of the PAC vent valve (14) is connected to the PAC dissolving tank (13), and the other side is connected to the vent main pipe (7).

3. The wastewater treatment plant secondary effluent micro-dynamic coagulation and sedimentation device according to claim 1, characterized in that: The PAM dosing device (2) includes a PAM dissolving tank (23), a PAM mixer (22), a PAM dosing pump (21), and a PAM vent valve (24). One side of the PAM dosing pump (21) is connected to the folded plate flocculation zone (3), and the other side is connected to the PAM dissolving tank (23). One side of the PAM vent valve (24) is connected to the PAM dissolving tank (23), and the other side is connected to the vent main pipe (7).

4. The wastewater treatment plant secondary effluent micro-dynamic coagulation and sedimentation device according to claim 1, characterized in that: A double-blade mixer (51) is installed inside the coagulation zone (5). A submerged water inlet (52) is installed in the lower left corner of the coagulation zone (5), and a baffle flocculation zone water inlet (33) is installed in the upper right corner. A flow meter (53) is installed inside the coagulation zone (5). The rotational speed of the double-blade mixer (51) is 0-80 rpm.

5. The wastewater treatment plant secondary effluent micro-dynamic coagulation and sedimentation device according to claim 4, characterized in that: The folded flocculation zone (3) uses a vertical flow folded plate (31) to form vortices of different sizes; The folded plate flocculation zone (3) is equipped with a reaction zone vent valve (32), which is connected to the vent main pipe (7).

6. The wastewater treatment plant secondary effluent micro-dynamic coagulation sedimentation device according to claim 4, characterized in that: The sludge settling zone (4) uses inclined tube packing (42), and the sludge settling zone (4) uses perforated sludge pipe (45) to collect sludge. The sludge is discharged by water pressure difference, and no sludge pump power equipment is required. The perforated sludge pipe (45) is provided with a perforated opening (451). The sludge settling zone (4) is equipped with multiple electric sludge valves (43), which are connected to the venting main pipe (7).

7. The wastewater treatment plant secondary effluent micro-dynamic coagulation and sedimentation device according to claim 4, characterized in that: The inlet (33) of the folded plate flocculation zone is located in the middle of the first corridor of the folded plate flocculation zone (3).

8. The wastewater treatment plant secondary effluent micro-dynamic coagulation and sedimentation device according to claim 6, characterized in that: The sludge settling zone (4) is connected through the sludge settling zone inlet (46), which is made of a partition with openings. The sludge sedimentation zone (4) adopts a triangular water collection weir (41); The sludge sedimentation zone (4) is equipped with an outlet (44). The sludge sedimentation zone (4) is equipped with a sludge level gauge (47).

9. The wastewater treatment plant secondary effluent micro-dynamic coagulation and sedimentation device according to claim 6, characterized in that: Both the submerged inlet (52) and outlet (44) adopt flange interfaces, which are universally compatible.

10. The wastewater treatment plant secondary effluent micro-dynamic coagulation sedimentation device according to claim 6, characterized in that: It also includes a PLC system (6), the control signal input terminal of which is connected to a flow meter (53) and a sludge level gauge (47), and the control signal output terminal of the PLC system (6) is connected to a double-blade mixer (51), an electric sludge valve (43), a PAC dosing device (1), and a PAM dosing device (2).

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