Nozzle type water distribution device and anaerobic biochemical pool or anoxic biochemical pool

Abstract

The utility model relates to a nozzle type water distribution device and an anaerobic biochemical pool or an anoxic biochemical pool. The water distribution device is provided with a water distribution pipe, a plurality of nozzles are mounted on the water distribution pipe and can be duckbilled nozzles, frustum-shaped nozzles or hyperboloid nozzles, each nozzle is provided with a reducing section and an equal-diameter section, the water distribution pipe is of an annular structure or a radial structure and is connected with a water inlet pipe, and a water inlet is formed in the outer end of the water inlet pipe. And the water distributor is arranged in the anaerobic biochemical pool or the anoxic biochemical pool. Effective mixing and stirring in the tank can be realized through jet flow generated by water distribution, a stirrer is not needed for a small-scale anaerobic tank and an anoxic tank, investment and power consumption are saved, and an anaerobic or anoxic environment in the tank cannot be damaged.

Description

Technical Field

[0001] The utility model relates to a nozzle type water distribution device and an anaerobic biochemical pool or an anoxic biochemical pool adopting the water distribution device, which can be mainly used in the anaerobic and anoxic sections of sewage treatment stations. Background Art

[0002] In order to prevent the activated sludge in the anaerobic tank or anoxic tank from separating from the mud and water due to gravity sedimentation, large sewage treatment plants usually install agitators or flow pushers in the anaerobic tank or anoxic tank to ensure sufficient mixing of the mud and water and prevent the sedimentation of the activated sludge.

[0003] However, small-scale sewage treatment facilities are not suitable for installing agitators due to their small treatment scale and small volume of anaerobic or anoxic tanks. The main reasons include: (1) the lack of conditions for installing mechanical agitators. At the same time, since anaerobic and anoxic tanks have requirements for dissolved oxygen, air agitation cannot be used. (2) The installation of agitators is relatively small compared to the tonnage of the station, the power consumption is large, the overall operating power is relatively high, and the cost is relatively high. Therefore, agitation in anaerobic or anoxic tanks has become an urgent problem that small-scale sewage treatment facilities need to solve. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the utility model provides a nozzle-type water distribution device and an anaerobic biochemical pool or an anoxic biochemical pool using the water distribution device to distribute water, so as to meet the needs of small sewage treatment facilities.

[0005] The technical solution of the utility model is: a nozzle type water distribution device, provided with a water distribution pipe, the water distribution pipe is installed with a plurality of nozzles (water spray nozzles, or short water outlet pipes), and the nozzles are provided with a reduced diameter section.

[0006] Preferably, the tube hole of the diameter-reduced section is in the shape of a frustum (eg, a truncated cone), or the diameter-reduced section adopts a duckbill structure.

[0007] Preferably, the outlet end of the reduced diameter section is provided with a chamfered structure (a small frustum-shaped structure with the large end facing outward).

[0008] Preferably, the tube hole (hole wall) of the reduced diameter section is in the shape of a rotating curved surface, the hole diameter on the inlet side (or inlet end) of the reduced diameter section is larger than the hole diameter on the outlet side (or outlet end), and the minimum hole diameter inside the tube hole is smaller than the hole diameter on the outlet side.

[0009] Preferably, the rotation curved surface is a rotation curved surface with negative Gaussian curvature.

[0010] Preferably, the rotational curved surface is a hyperboloid (single-leaf hyperboloid).

[0011] Furthermore, the nozzle is also provided with a constant diameter section, the tube hole of the constant diameter section is cylindrical, equal to the tube hole on the inlet side of the reduced diameter section, and connected to the inlet side of the reduced diameter section, and the axes of the reduced diameter section and the constant diameter section coincide (are located on the same straight line).

[0012] Furthermore, the water distribution pipe adopts an annular structure or a radial structure, and the radial structure is composed of several straight water distribution branches. The inner ends of each water distribution branch intersect and are interconnected at the central part of the radial structure. Each water distribution branch is located on the same plane and is distributed at equal angular distances.

[0013] The water distribution pipe is connected to a water inlet pipe, and the outer end of the water inlet pipe is provided with a water inlet.

[0014] An anaerobic biochemical pool (anaerobic pool for short) or an anoxic biochemical pool (anoxic pool for short) is provided with a water distribution device, which is any nozzle-type water distribution device disclosed in the utility model. The water distribution pipe is arranged at the lower part of the pool (for example, the bottom of the pool), and the water distribution pipe is connected to a water inlet pipe. The water inlet pipe extends upward, and its top is a water inlet for receiving water.

[0015] This new model utilizes the principles of hydraulics, creating a circular flow within the pool through the impact and turbulence of high-speed water flow, combined with the angle adjustment of the pipe and the pool wall. This also creates an upward flow by combining the positional differences between the water inlet at the bottom and the water outlet at a higher point. In the absence of agitation, relying on the water's own properties, a spiral upward flow forms within the pool, achieving the goal of mixing mud and water.

[0016] The beneficial effects of the utility model are as follows: since the jet water flow generated by the water distributor can achieve effective mixing and stirring in the pool, for small-scale anaerobic pools and anoxic pools, no agitator is required, saving investment and electricity consumption; the hydraulic agitation originates from the bottom of the pool, which can effectively / efficiently achieve full mixing of sludge particles and water, and is conducive to avoiding or reducing reoxygenation caused by stirring, preventing the increase of dissolved oxygen in the pool from causing damage to the anaerobic or anoxic environment; the water distributor and its hydraulic agitation effect can be used to achieve mixing of the components of the influent and reflux. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of one embodiment of the nozzle of the present invention (conical / frustum-shaped nozzle);

[0018] Figure 2 This is a schematic diagram of the structure of another embodiment of the nozzle of the present invention (a hyperbolic nozzle);

[0019] Figure 3 This is a schematic diagram (top view) of the structure of one embodiment (square pool) of the anaerobic tank / anoxic tank of the present invention;

[0020] Figure 4 yes Figure 3 Schematic diagram of the example structure (main view);

[0021] Figure 5 yes Figure 3 A schematic diagram of the structure of an improved (varied) embodiment (top view);

[0022] Figure 6 This is a schematic diagram (top view) of another embodiment (round tank) of the anaerobic tank / anoxic tank of the present invention;

[0023] Figure 7 yes Figure 6 Schematic diagram of the example structure (main view);

[0024] Figure 8 yes Figure 6 A schematic diagram of the structure of an improved (varied) embodiment (top view);

[0025] Figure 9 It is a schematic diagram (elevation) of the principle of water flow in the pool (with the pool wall as the boundary) involved in the utility model;

[0026] Figure 10 It is a schematic diagram (plane) of the principle of water flow in the pool (with the pool wall as the boundary) involved in the utility model. DETAILED DESCRIPTION

[0027] See also Figures 1-10 A plurality of nozzles 10 are installed on the water distribution pipe 20 of this water distributor. The nozzles are provided with a reduced diameter section. When water passes through the reduced diameter section 2, the flow area is reduced and the speed increases, forming a jet (fast water flow).

[0028] Any suitable nozzle that can increase the water outlet speed can be used, for example, a duckbill nozzle (duckbill outlet pipe). The outlet of this nozzle is a flat mouth, and the flow area of ​​the flat mouth is significantly smaller than the circular mouth area of ​​the water inlet end, so as to form a faster flow rate. At the same time, the water outlet stream is flat, which is conducive to expanding the impact range.

[0029] Another type of nozzle is the conical (frustum-shaped) nozzle (see Figure 1 ), the pipe mouth on the water inlet side is a circular hole, and the pipe hole on the water outlet side is a truncated cone-shaped hole with a gradually decreasing inner diameter. When water flows from the water inlet side to the water outlet side, the flow area gradually decreases and the flow rate gradually increases.

[0030] A frustum-shaped chamfer (or chamfer structure) 4 can be provided at the outlet end of the frustum-shaped nozzle. The taper of the small frustum-shaped chamfer is no greater than that of the frustum-shaped orifice of the reduced diameter section (the frustum-shaped main body). This small frustum-shaped chamfer allows the outlet water jet to form a velocity gradient from the center to the periphery, constrained and guided by the chamfer. This tapered jet shape helps extend the reach of the outlet water jet (or jet length), avoiding excessive jet energy consumption at the outlet due to excessive turbulence and entrainment, thereby preventing excessive energy consumption from affecting the jet distance and hydraulic agitation effect.

[0031] As a preferred embodiment, the nozzle is a hyperbolic nozzle (see Figure 2 ), the inner surface 3 of the reduced diameter section adopts a single-leaf hyperbolic structure, and can be further optimized so that the aperture of its water outlet end (the water outlet end of the reduced diameter section, that is, the water outlet end of the nozzle) is about 1 / 2 of the water inlet end (the water inlet end of the reduced diameter section, whose aperture is equal to the aperture of the equal diameter section, that is, equal to the aperture of the inlet end of the nozzle), or in other words, the pipe hole area of ​​the water outlet end of the reduced diameter section (or nozzle) is 1 / 5 to 1 / 3 (including the end values) of the pipe hole area of ​​the water inlet end. Under this hyperbolic nozzle structure, the water flow through the reduced diameter section gradually changes in the axial direction and the radial direction (radial direction of the same cross-section / flow surface). The water outlet can be ejected over a long distance, and the interaction between the flow beam and the surrounding sludge / water is mainly impact / momentum transfer, and less energy is consumed due to turbulence and suction. Based on comparative tests under the same conditions on site, in common usage scenarios (water distribution flow rate / flow velocity), the water discharge distance and stirring effect of this hyperbolic nozzle are visibly better than those of common reduced-diameter nozzles (for example, frustum-shaped nozzles), and are significantly better than straight pipe (equal-diameter nozzle) water discharge.

[0032] An external thread or other connection structure can be provided on the equal-diameter section 1 of the nozzle for installation and connection on a water distribution pipe or the like.

[0033] The shape of the water distribution pipe can adopt any suitable existing technology and can be set according to the shape (planar shape) of the pool body (or pool) 40. For example, Figure 3-Figure 5In the example, a rectangular (square) pool is used, and the water distribution pipe can also be square and set horizontally. The water inlet pipe 30 of the water distributor is set vertically and can be connected to any part of the rectangular water distribution pipe. The nozzle (first nozzle) installed on the water distribution pipe is also set horizontally (or close to horizontal, for example, the outer end is slightly tilted upward), and the direction of the nozzle on the horizontal plane (or the projection of the nozzle direction on the horizontal plane) can be set vertically (perpendicular to the water distribution pipe) or obliquely (there is an angle of no more than 90° with the direction perpendicular to the water distribution pipe, and the angle is usually controlled to be no more than 15°). For example, some nozzles are vertically set nozzles 11, and some nozzles are obliquely set nozzles 12. The obliquely set nozzles have the same circumferential deflection direction, thereby jointly pushing the water in the pool body to form a vortex. At the same time, since the water inlet is at the bottom and the water outlet is at the top, there is an upward flow in the vertical direction. The common result of these movements is the formation of an overall spiral upward flow, but there are still different modes of flow in each part (see Figure 9 and Figure 10 ).

[0034] exist Figure 6-Figure 8 In the example, a circular pool is used, and the water distribution pipe adopts a radial structure with equal angular spacing. The water inlet pipe of the water distributor is arranged vertically, and its lower end is connected to the center of the radial structure (that is, the center of the water distribution pipe). A guide cone can be installed in the center of the radial structure. The guide cone is located directly below the bottom end of the water distribution pipe, with its top facing upward and its axis coinciding with the axis of the central guide cylinder. When water flows from the lower end of the water inlet pipe into the center of the water distribution pipe, it is guided by the guide cone and dispersed to the surrounding area, flowing into the various branches 25 of the water distribution pipe. Nozzles are installed on each branch pipe, and the direction (outlet end) can be tilted upward and to the same side of the circumference, thereby jointly promoting the rising vortex.

[0035] The above nozzles can all be referred to as first nozzles.

[0036] Depending on actual needs, a second nozzle (a nozzle with a different distribution or placement pattern from the first nozzle, typically not directly mounted on the water distribution pipe, but where appropriate, it can be installed directly on the water distribution pipe)15 can be installed at key or specific locations within the pool. The second nozzle has the same structure as the first nozzle installed on the water distribution pipe. The second nozzle is positioned toward areas prone to sludge deposition or based on the desired water flow pattern.

[0037] For example, in Figure 5In the example shown, sludge easily accumulates at the four corners of the rectangular tank's bottom surface (referred to as dead zones). A second nozzle 15 can be installed on one side of each corner. These second nozzles are used to impact these dead zones, with their jets directed toward the dead zones and along the swirling flow within the tank. The second nozzles lift the sludge from the corners (or other dead zones) and merge it into the rising swirling flow within the tank. The water inlet of the second nozzle can be connected to a water distribution pipe or inlet pipe via a connecting pipe to supply water to the second nozzle.

[0038] exist Figure 8 In the example, a second nozzle 15 is provided at the end of each branch pipe 25. These second nozzles are used to form a vortex. The second nozzles on each branch pipe are oriented in the same circumferential direction, thereby pushing the water in the peripheral area of ​​the circular pool to form a vortex, which is not only conducive to driving the sludge, but also can flush the pool wall. In this case, the first nozzles installed in the branch pipe (all nozzles except the second nozzle) can be directed upward and / or toward the horizontal sides of the branch pipe, etc., so as to flush the sludge around the branch pipe and mix it into the rising water flow.

[0039] Anaerobic and anoxic tanks can be improved based on existing technologies to meet the requirements of sewage treatment plants (especially small-scale sewage treatment facilities) where anaerobic and anoxic tanks need to maintain a thorough mixing of sludge and water and avoid the introduction of oxygen. Since the inlet and return flow of sewage treatment systems generally enter anaerobic or anoxic tanks, the principles of hydraulics can be utilized to prevent sludge sedimentation by rationally setting the outlet position and potential energy of the return pipe and increasing the outlet flow rate of the inlet pipe to enhance the impact and agitation of the inlet and / or return mixed liquid on the water in the tank.

[0040] The head potential energy output by the regulating tank pump is used to create a plug flow within the anoxic and anaerobic tanks, disturbing the mud-water mixture within the tanks for better mixing. The water distribution pipes 20 are evenly distributed across the tank bottom, and several water nozzles (nozzles) 10 are installed on the water distribution pipes to achieve multi-point water discharge. The nozzles utilize a reduced-diameter structure to reduce the flow area and increase the flow rate. For example, duckbill nozzles (also known as duckbill structures), frustum-shaped nozzles (with a frustum-shaped orifice), or hyperbolic nozzles (with a hyperbolic orifice). Anoxic / anaerobic tanks can utilize multiple pipelines and multiple controllable water outlets. Multiple manual or electric valves are installed on the relevant pipes at the tank top, divided into regular spraying and localized spraying for key areas. These valves are activated on demand, and when the pumps are running, the nozzles on the water distributors begin spraying water. Because the water distribution pipes (distribution pipes) are laid flat across the tank bottom and utilize a multi-point water discharge spraying system, a plug flow effect is achieved across the tank. During the sludge settling process, the water flow is disturbed, forming a push flow, and the muddy water flows with the water flow in the tank body.

[0041] By setting a second nozzle in the key area, spray disturbance is carried out in the local key sedimentation area or dead corner to avoid excessive sludge deposition in the key sedimentation area or sludge deposition in the dead zone.

[0042] Since the water distribution pipe is laid at the bottom of the pool, the position and direction of the nozzle can be set by spraying water upward and obliquely upward from the bottom to push the sludge in the water flow to follow the water flow.

[0043] The water inlet pipe 42, water outlet pipe, return pipe, mud discharge pipe, etc. of the pool (anaerobic pool or anoxic pool) can be set according to actual needs. The outlet of the water inlet pipe is connected to the water inlet pipe of the water distributor, and pumps and valves are configured according to actual needs.

[0044] The treatment facilities (anaerobic tank or anoxic tank) of this utility model have the following characteristics:

[0045] 1) No need for agitator, saving investment and electricity consumption;

[0046] 2) No need to set air stirring to prevent the increase of dissolved oxygen in the pool from causing damage to the anaerobic or anoxic environment;

[0047] 3) The inlet and return water are fully mixed.

[0048] 4) Solve the problem of mixing mud and water in anoxic tanks and anaerobic tanks in small sewage treatment plants;

[0049] 5) By using the water pump potential energy from the previous regulating tank, the cost of agitator equipment and electricity are saved;

[0050] 6) The anaerobic anoxic tank has low oxygen content and uses water itself as power to maximize the problem of oxygen intake;

[0051] 7) Because the station is small, the equipment model needs to be smaller, and conventional equipment cannot meet the requirements. The power and energy consumption of conventional equipment will be too high, so it is necessary to choose to operate with its own power source, and the station should be changed.

[0052] 8) Solve the problem of excessive and oversized equipment operation due to small stations.

[0053] 9) As for the oxygen demand of anaerobic anoxic tank, the amount of oxygen carried by the water itself can meet its own needs, and a small amount of aeration can meet the demand.

[0054] 10) Multi-point distribution can make the water and mud mix more evenly, which is conducive to full reaction.

[0055] Unless otherwise specified or when one preferred or optional technical means is a further limitation of another technical means, the preferred and optional technical means disclosed in the present utility model can be arbitrarily combined to form several different specific implementation methods.

Claims

1. A nozzle type water distribution device, provided with a water distribution pipe, characterized in that The water distribution pipe is provided with a plurality of nozzles, each of which is provided with a diameter-reducing section. The pipe hole of the diameter-reducing section is in the shape of a rotating curved surface. The inlet side aperture of the diameter-reducing section is larger than the outlet side aperture, and the minimum aperture inside the pipe hole is smaller than the outlet side aperture.

2. The nozzle type water distribution device according to claim 1, characterized in that The tube hole of the diameter-reducing section is in a frustum shape, or the diameter-reducing section adopts a duckbill structure.

3. The nozzle type water distribution device according to claim 2, characterized in that The outlet end of the diameter-reducing section is provided with a chamfered structure.

4. The nozzle type water distribution device according to claim 3, characterized in that The rotation curved surface is a rotation curved surface with negative Gaussian curvature.

5. The nozzle type water distribution device according to claim 3, characterized in that The rotation curved surface is a hyperbolic surface.

6. The nozzle type water distribution device according to any one of claims 1 to 5, characterized in that The nozzle is further provided with a constant diameter section, the tube hole of the constant diameter section is cylindrical and equal to the tube hole on the inlet side of the reduced diameter section, and is connected to the inlet side of the reduced diameter section, and the axes of the reduced diameter section and the constant diameter section coincide.

7. The nozzle type water distribution device according to any one of claims 1 to 5, characterized in that The water distribution pipe adopts an annular structure or a radial structure. The radial structure is composed of several straight water distribution branches. The inner ends of each water distribution branch intersect and are interconnected at the central part of the radial structure. Each water distribution branch is located on the same plane and is distributed at equal angular distances.

8. The nozzle type water distribution device according to claim 7, characterized in that The water distribution pipe is connected to a water inlet pipe, and the outer end of the water inlet pipe is provided with a water inlet.

9. An anaerobic biochemical pool or anoxic biochemical pool, provided with a water distribution device, characterized in that The water distribution device is a nozzle-type water distribution device according to any one of claims 1 to 7, and the water distribution pipe is arranged in the lower part of the pool. The water distribution pipe is connected to a water inlet pipe, and the water inlet pipe extends upward, and its top is a water inlet for receiving water.

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