Potential energy recovery type sewage mixing and stirring device

Abstract

The utility model provides a kind of potential energy recovery formula sewage mixing stirring device, it belongs to sewage treatment technical field, it includes anaerobic tower, anoxic tank, liquid level control assembly and pressure stabilizer, the anaerobic tower outside is equipped with riser, the water outlet of anaerobic tower is communicated with riser, the lateral wall of riser is equipped with anaerobic effluent pipe, the anoxic tank is equipped with stirring assembly, the stirring assembly includes L-shaped water distribution main pipe and multiple array distribution water distribution branch pipe, multiple water distribution branch pipe are communicated with L-shaped water distribution main pipe, every water distribution branch pipe is equipped with multiple array distribution stirring nozzle. The utility model is driven stirring nozzle to form jet by the natural water head difference between anaerobic tower and anoxic tank, maintain stable water head in combination with liquid level control assembly, balance water flow pressure fluctuation using pressure stabilizer, effectively solve the problem of high energy consumption and energy waste of traditional mechanical stirring.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, and in particular relates to a potential energy recovery type wastewater mixing and stirring device. Background Technology

[0002] In the biological denitrification process of wastewater treatment, the anoxic tank is the core unit for denitrifying bacteria to carry out denitrification reactions. It is necessary to ensure that the sludge and wastewater in the tank are fully mixed in order to improve the denitrification efficiency.

[0003] Existing methods for mixing anoxic tanks primarily rely on mechanical mixing, which has the following drawbacks:

[0004] 1. The mechanical mixer requires an external power supply, based on a 2500m³ anoxic tank. 3 Stirring intensity 10W / m 3 It is estimated that the annual power consumption of the stirring machinery in the anoxic tank is greater than 200,000 kWh, which is relatively high. Furthermore, the 12-24m head difference between the anaerobic tower and the anoxic tank is not effectively utilized. This potential energy is ultimately converted into the heat energy of the water flow, the vibration energy of the pipeline, and noise, resulting in serious energy waste.

[0005] 2. Mechanical mixing results in poor uniformity, high flow velocity near the mixing area, and dead zones easily formed in the corners of the tank away from the mixing area, leading to sludge accumulation.

[0006] 3. Mechanical agitators rely on the rotation of impellers for mixing, which makes them prone to getting entangled in suspended debris, requiring shutdown for cleaning. Mechanical components such as impellers and seals require regular maintenance, resulting in a high failure rate. Utility Model Content

[0007] The purpose of this utility model is to solve the problems mentioned in the background art of the prior art, and to propose a potential energy recovery type sewage mixing and stirring device.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A potential energy recovery type wastewater mixing and stirring device, comprising:

[0010] An anaerobic tower is provided with a riser on its outer side, and the outlet of the anaerobic tower is connected to the riser. An anaerobic water outlet pipe is connected to the side wall of the riser.

[0011] Anoxic tank, wherein an agitation assembly is provided in the anoxic tank, the agitation assembly includes an L-shaped water distribution main pipe and multiple water distribution branch pipes arranged in an array, the multiple water distribution branch pipes are all connected to the L-shaped water distribution main pipe, and each water distribution branch pipe is provided with multiple array-arranged agitation nozzles.

[0012] The liquid level control component includes a flange-type liquid level gauge located at the bottom of the riser and an electric regulating valve located on the anaerobic outlet pipe. The flange-type liquid level gauge is used to monitor the liquid level height of the riser and transmit it to the PLC. The electric regulating valve automatically adjusts the valve opening according to the set liquid level height to ensure that the water inflow and outflow of the riser is constant.

[0013] A pressure stabilizing tank is located between the anaerobic effluent pipe and the L-shaped water distribution main pipe and is fixed to the edge of the anoxic pool by a bracket. The pressure stabilizing tank is connected to the anaerobic effluent pipe and the L-shaped water distribution main pipe, and a nitrification liquid return pipe is also connected to the pressure stabilizing tank.

[0014] Preferably, the height H1 of the anaerobic tower is 20-28m, the height H2 of the anoxic tank is 4-8m, and the head difference ΔH = H1-H2 between the anaerobic tower and the anoxic tank is 12-24m. The potential energy of this head difference is used to drive the stirring of the anoxic tank.

[0015] Preferably, the nitrification liquid return pipe is connected to the aerobic tank via a water pump.

[0016] Preferably, the internal return flow rate of the nitrification liquid return pipe is 100%-400% of the influent flow rate. When the stirring intensity of the anaerobic effluent is insufficient, the nitrification liquid introduced into the aerobic tank through the nitrification liquid return pipe is stirred together to improve the stirring intensity.

[0017] Preferably, the stirring nozzle is installed at a height of 0.5-1.5m above the bottom of the anoxic pool, and the angle of depression of the stirring nozzle is 45-75°.

[0018] Preferably, the jet from the stirring nozzle covers the sludge layer at the bottom of the anoxic tank, and the jet from the stirring nozzle reaches the bottom of the tank, reflects, and then diffuses upwards.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. This utility model converts the potential energy of the natural head difference between the anaerobic tower and the anoxic tank into the kinetic energy of the water jet from the stirring nozzle to stir the anoxic tank. It eliminates the need for an external power source for mechanical stirring, thereby reducing energy consumption at the source and solving the problem of energy waste caused by mechanical stirring.

[0021] 2. This utility model forms a jet network covering the entire pool by arranging multiple arrayed stirring nozzles, eliminating stirring dead zones and improving the uniformity of stirring and mixing.

[0022] 3. This utility model eliminates the need for mechanical agitation in its impeller, seals, and other components, thus avoiding the problem of debris entanglement, effectively reducing the risk of equipment failure, and extending the equipment's service life. Attached Figure Description

[0023] Figure 1This is a schematic diagram of the overall structure of a potential energy recovery type sewage mixing and stirring device proposed in this utility model;

[0024] Figure 2 This is a diagram showing the distribution of stirring nozzles in a potential energy recovery type sewage mixing and stirring device proposed in this utility model;

[0025] Figure 3 This is a schematic diagram of the stirring nozzle structure of a potential energy recovery type sewage mixing and stirring device proposed in this utility model.

[0026] In the diagram: 10 Anaerobic tower, 11 Riser, 12 Anaerobic effluent pipe;

[0027] 20 Anoxic tank, 21 L-shaped main water distribution pipe, 22 branch water distribution pipe, 23 stirring nozzle;

[0028] 30 Flange-type level gauge; 31 Electric regulating valve;

[0029] 40 Pressure stabilizing tank, 41 Nitration liquid return pipe. Detailed Implementation

[0030] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0031] Reference Figures 1-3 A potential energy recovery type sewage mixing and stirring device includes an anaerobic tower 10, an anoxic tank 20, a liquid level control component and a pressure stabilizing tank 40. A riser 11 is provided on the outside of the anaerobic tower 10. The outlet of the anaerobic tower 10 is connected to the riser 11. Specifically, the outlet of the anaerobic tower 10 and the inlet of the riser 11 are fixed by welding or flange connection. An anaerobic effluent pipe 12 is connected to the side wall of the riser 11.

[0032] The anoxic tank 20 is equipped with a stirring assembly, which includes an L-shaped main water distribution pipe 21 and multiple arrayed branch water distribution pipes 22. All branch water distribution pipes 22 are connected to the L-shaped main water distribution pipe 21. Each branch water distribution pipe 22 is equipped with multiple arrayed stirring nozzles 23. Specifically, the branch water distribution pipes 22 are arrayed along the length of the anoxic tank 20, and the horizontal branch pipes of the L-shaped main water distribution pipe 21 are arranged along the width of the anoxic tank 20. The height H1 of the anaerobic tower 10 is 20- The height of the anoxic tank H2 is 4-8m, and the head difference ΔH = H1-H2 between the anaerobic tower 10 and the anoxic tank 20 is 12-24m. The potential energy of this head difference is used to drive the stirring of the anoxic tank 20. The stirring nozzle 23 is installed at a height of 0.5-1.5m above the bottom of the anoxic tank 20. The angle of depression of the stirring nozzle 23 is 45-75°. The jet of the stirring nozzle 23 covers the sludge layer at the bottom of the anoxic tank 20. After the jet of the stirring nozzle 23 reaches the bottom of the tank, it is reflected and then diffuses upward.

[0033] The liquid level control component includes a flange-type liquid level gauge 30 located at the bottom of the riser 11 and an electric regulating valve 31 located on the anaerobic outlet pipe 12. Specifically, the flange-type liquid level gauge 30 refers to a liquid level sensor installed at the bottom of the riser 11 via a flange. It can be a differential pressure type or an ultrasonic measuring element. The flange-type liquid level gauge 30 is used to monitor the liquid level height of the riser 11 and transmit it to the PLC. The electric regulating valve 31 refers to a flow control valve driven by a motor. It can be a butterfly valve or a ball valve structure. The electric regulating valve 31 automatically adjusts the valve opening according to the set liquid level height to ensure a constant inflow and outflow of water into and out of the riser 11.

[0034] A pressure stabilizing tank 40 is located between the anaerobic effluent pipe 12 and the L-shaped water distribution main pipe 21 and is fixed to the edge of the anoxic tank 20 by a bracket. The pressure stabilizing tank 40 is connected to the anaerobic effluent pipe 12 and the L-shaped water distribution main pipe 21. Specifically, the pressure stabilizing tank 40 refers to a pressure balancing container with a buffer volume. It can be a cylindrical steel tank to eliminate the influence of water flow pulsation on the water distribution system. The pressure stabilizing tank 40 is also connected to a nitrification liquid return pipe 41. The nitrification liquid return pipe 41 is connected to the aerobic tank through a water pump (both the water pump and the aerobic tank are existing technologies and are not shown in the figure). The internal return flow rate of the nitrification liquid return pipe 41 is 100%-400% of the influent flow rate. When the stirring intensity of the anaerobic effluent is insufficient, the nitrification liquid return pipe 41 introduces nitrification liquid into the aerobic tank for co-stirring to improve the stirring intensity.

[0035] The functional principle of this utility model can be explained through the following operation methods:

[0036] The effluent from the anaerobic tower 10 passes through the riser 11 and the anaerobic effluent pipe 12 before entering the pressure tank 40 for mixing. The pressure tank 40 absorbs the water flow pulsation caused by the pipe resistance and the fine adjustment of the electric regulating valve 31 through its own buffer volume, and transforms the unstable water flow into a constant pressure water flow, providing a basis for the uniform jet of the stirring nozzle 23.

[0037] Water is distributed through the L-shaped main water distribution pipe 21 and the branch water distribution pipe 22 to multiple sets of stirring nozzles 23 to form a high-speed jet to stir the anoxic tank 20. The multiple arrays of stirring nozzles form a network covering the jet. At the same time, the jet reflects and diffuses upward after hitting the bottom of the tank, forming a circulating water flow from bottom to top, covering the entire volume of the anoxic tank 20, eliminating the stirring dead zone, ensuring the uniformity of the mixing of sewage and sludge in the tank, and meeting the reaction requirements of denitrifying bacteria. This utility model converts the natural potential energy formed by the head difference between the anaerobic tower 10 and the anoxic tank 20 into the kinetic energy of the water jet ejected by the stirring nozzles 23 to stir the anoxic tank 20. There is no need for an external power supply for mechanical stirring, which reduces energy consumption from the source and solves the problem of energy waste caused by mechanical stirring.

[0038] During the mixing process, the flange-type level gauge 30 at the bottom of the riser 11 monitors the sewage level in the riser 11 in real time and transmits the data to the PLC control system. The PLC automatically adjusts the opening of the electric regulating valve 31 on the anaerobic effluent pipe 12 according to the preset "stable liquid level threshold". If the liquid level in the riser 11 is too high, it means that the water flow is not smooth and may cause the anaerobic tower to overflow. In this case, the valve opening is increased to increase the water flow. If the liquid level is too low, it means that the water flow is too fast and may cause insufficient head difference. In this case, the valve opening is decreased to reduce the water flow. In the end, the water flow in and out of the riser 11 is kept constant, thereby maintaining the stable pressure of the anaerobic tower 10 effluent, thus ensuring stable potential energy output.

[0039] When the potential energy of the anaerobic effluent cannot provide sufficient stirring intensity due to fluctuations in the influent load, such as a sudden decrease in the influent flow leading to a drop in the effluent pressure, the flow rate of the water pump is adjusted to increase the return flow rate of the nitrified liquid. After the nitrified liquid enters the pressure stabilizing tank 40, it mixes with the anaerobic effluent, jointly increasing the total water flow pressure and flow rate entering the water distribution system, thereby enhancing the jet intensity of the stirring nozzle 23.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A potential energy recovery type wastewater mixing and stirring device, characterized in that, include: Anaerobic tower (10), with a riser (11) on the outside of the anaerobic tower (10), the outlet of the anaerobic tower (10) being connected to the riser (11), and an anaerobic water outlet pipe (12) being connected to the side wall of the riser (11). Anoxic pool (20) is provided with a stirring assembly. The stirring assembly includes an L-shaped water distribution main pipe (21) and multiple water distribution branch pipes (22) arranged in an array. The multiple water distribution branch pipes (22) are all connected to the L-shaped water distribution main pipe (21). Each water distribution branch pipe (22) is provided with multiple array-arranged stirring nozzles (23). The liquid level control component includes a flange-type liquid level gauge (30) located at the bottom of the riser (11) and an electric regulating valve (31) located on the anaerobic outlet pipe (12). The flange-type liquid level gauge (30) is used to monitor the liquid level height of the riser (11) and transmit it to the PLC. The electric regulating valve (31) automatically adjusts the valve opening according to the set liquid level height to ensure that the inflow and outflow of water in the riser (11) is constant. A pressure stabilizing tank (40) is located between the anaerobic effluent pipe (12) and the L-shaped water distribution main pipe (21) and is fixed to the edge of the anoxic pool (20) by a bracket. The pressure stabilizing tank (40) is connected to the anaerobic effluent pipe (12) and the L-shaped water distribution main pipe (21). A nitrification liquid return pipe (41) is also connected to the pressure stabilizing tank (40).

2. The potential energy recovery type sewage mixing and stirring device according to claim 1, characterized in that, The height H1 of the anaerobic tower (10) is 20-28m, the height H2 of the anoxic tank is 4-8m, and the head difference ΔH = H1-H2 between the anaerobic tower (10) and the anoxic tank (20) is 12-24m. The potential energy of this head difference is used to drive the stirring of the anoxic tank (20).

3. The potential energy recovery type sewage mixing and stirring device according to claim 1, characterized in that, The nitrification liquid return pipe (41) is connected to the aerobic tank via a water pump.

4. The potential energy recovery type sewage mixing and stirring device according to claim 3, characterized in that, The internal return flow rate of the nitrification liquid return pipe (41) is 100%-400% of the influent flow rate. When the stirring intensity of the anaerobic effluent is insufficient, the nitrification liquid return pipe (41) introduces nitrification liquid into the aerobic tank for synergistic stirring to improve the stirring intensity.

5. The potential energy recovery type sewage mixing and stirring device according to claim 1, characterized in that, The stirring nozzle (23) is installed at a height of 0.5-1.5m from the bottom of the anoxic pool (20), and the angle of depression of the stirring nozzle (23) is 45-75°.

6. The potential energy recovery type sewage mixing and stirring device according to claim 1, characterized in that, The jet from the stirring nozzle (23) covers the sludge layer at the bottom of the anoxic tank (20), and the jet from the stirring nozzle (23) reaches the bottom of the tank and then reflects and diffuses upward.

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