CN111675338A - VFL vertical flow labyrinth water flow structure, device, system and method for sewage treatment - Google Patents
VFL vertical flow labyrinth water flow structure, device, system and method for sewage treatment Download PDFInfo
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- CN111675338A CN111675338A CN202010658529.8A CN202010658529A CN111675338A CN 111675338 A CN111675338 A CN 111675338A CN 202010658529 A CN202010658529 A CN 202010658529A CN 111675338 A CN111675338 A CN 111675338A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
Abstract
The invention provides a VFL vertical flow labyrinth water flow structure for sewage treatment, which is a bent runner water flow structure and comprises a flow guide wall structure positioned in a sewage treatment pool, wherein the lower end of the flow guide wall structure is fixedly connected with the bottom of the sewage treatment pool. The guide wall structure divides the sewage treatment tank into an anaerobic zone, an anoxic zone and an aerobic zone which are connected in sequence, and a guide channel is arranged between the front end of the anaerobic zone and the front end of the aerobic zone. Be equipped with sewage water conservancy diversion structure in the water conservancy diversion passageway, sewage water conservancy diversion structure includes first guide plate and the second guide plate of a plurality of intervals settings, and first guide plate and second guide plate divide the water conservancy diversion passageway into a plurality of many check regions that communicate in proper order. The lower part of the first guide plate is provided with a lower part passing through channel. The lower end of the second guide plate is fixedly connected with the bottom of the sewage treatment tank, and the second guide plate is provided with an upper sewage crossing channel. The water flow structure has the advantages of low cost, simple structure, convenient use, no electromechanical equipment and convenient maintenance and repair.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a VFL vertical flow labyrinth water flow structure, a device, a system and a method for sewage treatment.
Background
At present, the application of an activated sludge method in sewage treatment is common, AO process and A2The O process and the like are widely applied, and sewage needs to sequentially pass through an anaerobic tank, an anoxic tank and an aerobic tank, and organic pollutants in the sewage are biodegraded by using activated sludge contained in a sewage treatment tank. In the sewage treatment process, the suspension of the activated sludge needs to be maintained, and the activated sludge cannot be settled to the bottom of the tank. The dissolved oxygen in the anaerobic tank is required to be controlled below 0.2mg/L, the dissolved oxygen in the anoxic tank is required to be controlled below 0.5mg/L, and the biochemical treatment of the sewage is damaged when the dissolved oxygen exceeds the limit, so that the sewage in the sewage treatment tank cannot be stirred and disturbed by installing aeration pipes in the anaerobic tank and the anoxic tank.
In the prior art, a submersible stirring motor is usually arranged at the bottom of an anaerobic tank and an anoxic tank, and stirring disturbance is performed by a stirrer to keep activated sludge in a suspended state. Although the mode solves the suspension problem of the activated sludge in the anaerobic tank and the anoxic tank, the following problems exist:
1. the submersible stirring motor has higher energy consumption during operation, and the operation cost of a sewage treatment plant is increased invisibly;
2. because the submersible stirring motor is arranged at the bottom of the tank and is strongly corroded by water and organisms, a sewage treatment plant needs to maintain the submersible stirring motor irregularly, and the maintenance cost of equipment is increased.
Therefore, the structures and the operation modes of the anaerobic tank and the anoxic tank of the sewage treatment tank in the existing sewage treatment plant need to be improved, so that the suspension of the activated sludge in the tank can be maintained, the operation energy consumption can be reduced, and the overhaul and maintenance costs can be reduced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a VFL vertical flow labyrinth water flow structure for sewage treatment, which is a water flow structure for sewage treatment, has the advantages of low cost, simple structure, convenient use, inorganic electric equipment and convenient maintenance and repair, changes the flowing mode of sewage in an anaerobic tank and an anoxic tank by designing the water flow structures in the anaerobic tank and the anoxic tank, does not increase any power equipment, only utilizes the gravity generated by water level difference to push the sewage to enter an aerobic tank along a flow guide channel, avoids the sedimentation of activated sludge in the anaerobic tank and the anoxic tank, and ensures the treatment effect of the sewage.
The technical scheme for realizing the purpose of the invention is as follows: the utility model provides a VFL vertical current maze rivers structure for sewage treatment, is a rivers structure for sewage treatment, including the water conservancy diversion wall structure that is located sewage treatment pond, the lower extreme and the sewage treatment bottom of pool fixed connection of water conservancy diversion wall structure. The guide wall structure divides the sewage treatment tank into an anaerobic zone, an anoxic zone and an aerobic zone which are connected in sequence, and a guide channel is arranged between the front end of the anaerobic zone and the front end of the aerobic zone.
Be equipped with sewage water conservancy diversion structure in the water conservancy diversion passageway, sewage water conservancy diversion structure includes first guide plate and the second guide plate of a plurality of intervals settings, and first guide plate and second guide plate divide the water conservancy diversion passageway into a plurality of many check regions that communicate in proper order. The lower part of the first guide plate is provided with a lower part crossing channel, the lower end of the second guide plate is fixedly connected with the bottom of the sewage treatment tank, and the second guide plate is provided with an upper part crossing channel for sewage.
Wherein, when the angle between the water flow direction of the lower crossing channel and the water flow direction of the upper crossing channel adjacent to the lower crossing channel is less than 90 degrees, the horizontal path distance between the first guide plate and the adjacent second guide plate is b, the width of the first guide plate is c, and the ratio of (b: c) to (b: c) is more than or equal to 0.5 and less than or equal to 2.5.
When b: when the ratio of c is designed to be 0.5-2.5, the activated sludge in the sewage can be effectively ensured to exist in a suspension state. Generally, in the gravity flow state, the state of the activated sludge entering the next grid is determined by the settling time of the vertical settling velocity of the sewage in the vertical distance and the translation time of the horizontal translation velocity in the horizontal path in the velocity of the sewage after the sewage turns over the upper turning channel. For example: when the settling time is longer than the translation time, the activated sludge enters the next grid in a suspension state; when the settling time is equal to the translation time and the activated sludge enters the next grid, the sludge just settles to the bottom of the pool; when the settling time is less than the translation time, the activated sludge is settled to the bottom of the tank when the activated sludge does not enter the next cell.
When b: when the value of c is less than 0.5, the horizontal path distance between the first guide plate and the second guide plate adjacent to the first guide plate is too small, the sectional area formed between the two guide plates is too small, when sewage flows over the second guide plate, the sewage is influenced by the inner wall of the first guide plate and the flow velocity is accelerated, turbulence can be formed on the surface of the inner wall, the process flow state is damaged, meanwhile, when the distance between the two guide plates is too small, the number of the first guide plate and the second guide plate needs to be increased for realizing process operation, and the construction cost is invisibly increased.
When b: when the value of c is more than 2.5, because the horizontal path is too long, the sedimentation time of the activated sludge is less than the translation time when the activated sludge reaches the next grid under the state of unpowered stirring at the bottom of the sewage treatment pool, namely, the activated sludge can be sedimented to the bottom of the pool when the activated sludge does not reach the next grid under the gravity flow state, so that the activated sludge is accumulated in the grids and cannot enter the next grid in a suspension state.
When the angle between the water flow direction of the lower crossing channel and the water flow direction of the upper crossing channel adjacent to the lower crossing channel is equal to 90 degrees, the width of the first guide plate is c, the width of the second guide plate is d, and the ratio of d to c is more than or equal to 0.5 and less than or equal to 2.5.
In the invention, when the ratio of d to c is designed to be 0.5-2.5, the activated sludge in the sewage can be effectively ensured to exist in a suspension state. Generally, in the gravity flow state, the state of the activated sludge entering the next grid is determined by the settling time of the vertical settling velocity of the sewage in the vertical distance and the translation time of the horizontal translation velocity in the horizontal path in the velocity of the sewage after the sewage turns over the upper turning channel. For example: when the settling time is longer than the translation time, the activated sludge enters the next grid in a suspension state; when the settling time is equal to the translation time and the activated sludge enters the next grid, the sludge just settles to the bottom of the pool; when the settling time is less than the translation time, the activated sludge is settled to the bottom of the tank when the activated sludge does not enter the next cell.
When d: when the value of c is less than 0.5, the horizontal path between the first guide plate and the second guide plate adjacent to the first guide plate is too small, the sectional area formed between the two guide plates is too small, when sewage flows over the second guide plate, the sewage is influenced by the inner wall of the first guide plate and the flow velocity is accelerated, turbulence can be formed on the surface of the inner wall, the process flow state is damaged, meanwhile, when the amount of the first guide plate and the second guide plate is too small, the number of the first guide plate and the second guide plate needs to be increased for realizing process operation, and the construction cost is invisibly increased.
When d: when the value of c is more than 2.5, because the horizontal path is too long, the sedimentation time of the activated sludge is less than the translation time when the activated sludge reaches the next grid under the state of unpowered stirring at the bottom of the sewage treatment pool, namely, the activated sludge can be sedimented to the bottom of the pool when the activated sludge does not reach the next grid under the gravity flow state, so that the activated sludge is accumulated in the grids and cannot enter the next grid in a suspension state.
Through having made clear that first guide plate passes through between the rivers direction of passageway and the rivers direction that the second guide plate upper portion that is adjacent rather than passes over the passageway in the lower part, when the angle is less than 90 and equals 90, the relation of the horizontal path b between the width c of first guide plate, the width d of second guide plate, first guide plate and its adjacent second guide plate has avoided because b: c or d: the value of c is set to be too small, so that the process flow state is damaged, and the construction cost is increased; avoiding b: c or d: c is too large, so that the activated sludge is precipitated in advance, and is accumulated in the grids to block the flow guide channel, thereby failing to complete the process circulation.
According to the invention, a water flow structure is designed in a sewage treatment tank of the sewage biochemical treatment device, and a water flow structure is designed in a flow guide wall structure, so that an anaerobic zone and an anoxic zone are divided into a plurality of multi-grid areas which are communicated in sequence and provided with k grids. During sewage treatment, sewage enters the (n + 1) th grid from the nth grid of the multi-grid region through the lower crossing channel of the first guide plate, then enters the (n + 2) th grid through the upper crossing channel of the second guide plate, then enters the (n + 3) th grid through the lower crossing channel of the first guide plate, … …, and the like until the sewage enters the aerobic zone through the Kth grid. In the process that sewage flows to the aerobic zone from the anaerobic zone, the sewage passes through the lower part crossing channel and the upper part crossing channel at intervals and crosses over to pass through the diversion channel from the front end of the anaerobic zone to the front end of the aerobic zone, finally enters the aerobic zone, and in the process that the sewage passes through each grid of the multi-grid zone in different forms, activated sludge in the sewage can be kept in a suspension state, so that the activated sludge can be suspended in the sewage by adding stirring devices in the anaerobic zone and the anoxic zone, and the sewage treatment effect is ensured.
According to the invention, the width c of the first guide plate, the width d of the second guide plate and the horizontal path distance b between the first guide plate and the adjacent second guide plate are limited, so that the sewage is ensured to flow from the front end of the anaerobic zone to the front end of the aerobic zone, and in the process that the sewage passes through the multi-grid area in an alternating mode of the upper crossing channel crossing and the lower crossing channel crossing, the activated sludge is ensured to be suspended in the sludge, the risk of blockage of the guide channel is avoided, and the effects of denitrification and dephosphorization in the sewage are ensured.
In order to make the diversion wall structure suitable for different sewage treatment tanks, the sewage treatment tank is divided into an anaerobic zone, an anoxic zone and an aerobic zone by the diversion wall structure, and a diversion channel formed between the front end of the anaerobic zone and the front end of the aerobic zone can be suitable for various biochemical sewage treatment devices, the diversion wall structure of the water flow structure is designed.
In one design of the guide wall structure, the guide wall structure is located in the sewage treatment tank, the guide wall structure is a closed-loop guide wall, and the closed-loop guide wall is not in contact with the side wall of the sewage treatment tank.
Specifically, the closed-loop structure flow guide wall comprises a first flow guide wall and a second flow guide wall which are connected end to end, and a flow guide channel is formed between the first flow guide wall and the side wall of the sewage treatment tank and between the second flow guide wall and the side wall of the sewage treatment tank.
The first flow guide wall and the second flow guide wall enclose an aerobic zone, so that the horizontal height of the first flow guide wall is higher than that of the first flow guide plate and that of the second flow guide plate in order to avoid that sewage in a multi-grid zone enters other zones through the first flow guide wall and causes disordered flow guide of the sewage in an anaerobic zone and an anoxic zone.
In order to facilitate the sewage in the last grid in the anoxic zone to smoothly cross the aerobic zone, the horizontal height of the second flow guide wall is lower than the horizontal height of the crossing channel at the upper part of the second flow guide plate at the tail end of the flow guide channel. In the invention, the horizontal height difference between the second guide wall and the upper crossing channel of the second guide plate at the tail end of the guide channel is a, wherein a is more than 0 and less than or equal to 20 cm.
Furthermore, the shape of the closed loop structure flow guide wall is one of a circular ring shape, an elliptical shape, a runway shape and a square shape.
In another design of the flow guide wall structure, the flow guide wall structure is positioned at one end in the sewage treatment tank, the flow guide wall structure is used for dividing the sewage treatment tank into an anaerobic zone, an anoxic zone and an aerobic zone which are sequentially connected, and a flow guide channel is arranged between the front end of the anaerobic zone and the front end of the aerobic zone. The water flow path of the flow guide channel can form water flow channels similar to S shape, T shape, Pi shape, III shape and the like on the horizontal plane.
The invention also provides a sewage treatment device which comprises the VFL vertical flow labyrinth water flow structure.
The invention also provides a sewage treatment system which comprises the sewage treatment device.
The invention also provides a sewage treatment method which is applied to the sewage treatment system.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the water flow structure designed by the invention, sewage passes through the channel at the lower part of the first guide plate and the upper part of the second guide plate passes through the channel, so that the sewage can smoothly flow to the aerobic zone in the anaerobic zone and the anoxic zone, the problem that water distribution, propulsion and stirring devices are required in the common anaerobic zone and the anoxic zone is solved, the water flow structure is simple in structure and free of power equipment, the equipment investment cost and the operation cost of anaerobic and anoxic biochemical treatment units are reduced, and the workload that stirring and propulsion at the bottom of a pool need to be regularly overhauled and maintained is also avoided.
2. Through the design of the flow guide wall structure of the water flow structure, a flow guide channel from the front end of the anaerobic zone to the front end of the aerobic zone through the anoxic zone is formed, sewage flows forwards along the channel, on one hand, the reaction flow is prolonged to the maximum extent, a plug flow state is formed, the sewage is ensured not to flow short, on the other hand, the sludge in the anaerobic zone and the anoxic zone can be in a suspension state, and is fully mixed and reacted with the sewage and the sludge, and the denitrification and dephosphorization effects are improved.
3. The relation between the water flow direction of the first guide plate passing through the channel at the lower part and the water flow direction of the second guide plate adjacent to the first guide plate and crossing the channel at the upper part is clear, when the angle is smaller than 90 degrees and equal to 90 degrees, the width c of the first guide plate, the width d of the second guide plate and the horizontal path b between the first guide plate and the adjacent second guide plate are avoided because b: c or d: the value of c is set to be too small, so that the process flow state is damaged, and the construction cost is increased; avoiding b: c or d: c is too large, so that the activated sludge is precipitated in advance, and is accumulated in the grids to block the flow guide channel, thereby failing to complete the process circulation.
Drawings
In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings used in the description of the embodiment will be briefly introduced below. It should be apparent that the drawings in the following description are only for illustrating the embodiments of the present invention or technical solutions in the prior art more clearly, and that other drawings can be obtained by those skilled in the art without any inventive work.
FIG. 1 is a schematic cross-sectional view of a sewage guide structure of a VFL vertical flow labyrinth flow structure according to the present invention;
FIG. 2 is a schematic view of a biochemical sewage treatment apparatus with a square flow guide channel according to the present invention;
FIG. 3 is a schematic view of a biochemical sewage treatment apparatus with a circular flow guide channel according to the present invention;
FIG. 4 is a schematic view of a biochemical sewage treatment apparatus of a runner-type guide passage according to the present invention;
FIG. 5 is a schematic view of a biochemical sewage treatment apparatus with a S-like structure flow guide channel according to the present invention;
wherein, 1, a sewage treatment tank; 2. a guide wall structure; 3. an aerobic zone; 4. a flow guide channel; 5. a sewage diversion structure; 51. a first baffle; 52. a second baffle; 21. a first guide wall; 22. a second guide wall.
Detailed Description
The invention will be further described with reference to specific embodiments, and the advantages and features of the invention will become apparent as the description proceeds. These examples are illustrative only and do not limit the scope of the present invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications may be made without departing from the spirit and scope of the invention.
In the description of the present embodiments, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
Example 1:
referring to fig. 1, a VFL vertical flow labyrinth flow structure for sewage treatment is applied to a biochemical sewage treatment device, and in this embodiment, the VFL vertical flow labyrinth flow structure includes a flow guide wall structure 2 located in a sewage treatment tank 1, and a lower end of the flow guide wall structure 2 is fixedly connected to a bottom of the sewage treatment tank 1. The flow guide wall structure 2 is used for dividing the sewage treatment tank 1 into an anaerobic zone, an anoxic zone and an aerobic zone 3 which are connected in sequence, and a flow guide channel 4 is arranged between the front end of the anaerobic zone and the front end of the aerobic zone 3.
As shown in fig. 1, a sewage guide structure 5 is disposed in the guide channel 4, the sewage guide structure 5 includes a plurality of first guide plates 51 and second guide plates 52 disposed at intervals, and the guide channel 4 is divided into a plurality of sequentially-communicated multi-lattice regions by the first guide plates 51 and the second guide plates 52. The lower part of the first guide plate 51 is provided with a lower part through channel, the lower end of the second guide plate 52 is fixedly connected with the bottom of the sewage treatment tank, and the second guide plate 52 is provided with an upper part crossing channel for sewage.
Specifically, the lower crossing passage may be formed by a distance between the lower end of the first guide plate 51 and the bottom of the sewage treatment tank 1; the lower end of the first guide plate 51 may be connected to the bottom plate of the sewage treatment tank 1, and the lower portion of the first guide plate 51 may be provided with holes (including a plurality of circular holes, strip-shaped holes, grid holes, and the like) to form a lower portion through passage. The upper crossing channel may be formed at the edge of the upper end of the second flow guide plate 52, or may be formed by forming holes (including a plurality of circular holes, strip-shaped holes, grid holes, and the like) at different positions on the upper portion of each second flow guide plate 52 and forming the upper crossing channel by the formed holes.
When the angle between the water flow direction of the lower crossing channel and the water flow direction of the upper crossing channel adjacent to the lower crossing channel is less than 90 degrees, the horizontal path between the first guide plate 51 and the adjacent second guide plate 52 is b, the width of the first guide plate 51 is c, and the ratio of (b: c) to (c) is more than or equal to 0.5 and less than or equal to 2.5.
When b: when the ratio of c is designed to be 0.5-2.5, the activated sludge in the sewage can be effectively ensured to exist in a suspension state. Generally, in the gravity flow state, the state of the activated sludge entering the next grid is determined by the settling time of the vertical settling velocity of the sewage in the vertical distance and the translation time of the horizontal translation velocity in the horizontal path in the velocity of the sewage after the sewage turns over the upper turning channel. For example: when the settling time is longer than the translation time, the activated sludge enters the next grid in a suspension state; when the settling time is equal to the translation time and the activated sludge enters the next grid, the sludge just settles to the bottom of the pool; when the settling time is less than the translation time, the activated sludge is settled to the bottom of the tank when the activated sludge does not enter the next cell.
When b: when the value of c is less than 0.5, the horizontal path between the first guide plate 51 and the second guide plate 52 adjacent to the first guide plate is too small, the sectional area formed between the two guide plates is too small, when sewage flows over the second guide plate 52, the influence of the inner wall of the first guide plate 51 and the flow velocity are accelerated, turbulence can be formed on the surface of the inner wall, the process flow state is damaged, meanwhile, when the amount of the first guide plate 51 and the second guide plate 52 is too small, the process operation is realized, the number of the first guide plate 51 and the second guide plate 52 needs to be increased, and the construction cost is invisibly increased.
When b: when the value of c is more than 2.5, because the horizontal path is too long, the sedimentation time of the activated sludge is less than the translation time when the activated sludge reaches the next grid under the state of unpowered stirring at the bottom of the sewage treatment pool, namely, the activated sludge can be sedimented to the bottom of the pool when the activated sludge does not reach the next grid under the gravity flow state, so that the activated sludge is accumulated in the grids and cannot enter the next grid in a suspension state.
Wherein, when the angle between the water flow direction of the lower crossing channel and the water flow direction of the upper crossing channel adjacent to the lower crossing channel is equal to 90 degrees, the width of the first guide plate 51 is c, the width of the second guide plate 52 is d, wherein, the ratio of (d: c) to (d: c) is more than or equal to 0.5 and less than or equal to 2.5.
When the ratio of d to c is designed to be 0.5-2.5, the activated sludge in the sewage can be effectively ensured to exist in a suspension state. Generally, in the gravity flow state, the state of the activated sludge entering the next grid is determined by the settling time of the vertical settling velocity of the sewage in the vertical distance and the translation time of the horizontal translation velocity in the horizontal path in the velocity of the sewage after the sewage turns over the upper turning channel. For example: when the settling time is longer than the translation time, the activated sludge enters the next grid in a suspension state; when the settling time is equal to the translation time and the activated sludge enters the next grid, the sludge just settles to the bottom of the pool; when the settling time is less than the translation time, the activated sludge is settled to the bottom of the tank when the activated sludge does not enter the next cell.
When d: when the value of c is less than 0.5, the horizontal path between the first guide plate 51 and the second guide plate 52 adjacent to the first guide plate is too small, the sectional area formed between the two guide plates is too small, when sewage flows over the second guide plate 52, the influence of the inner wall of the first guide plate 51 and the flow velocity are accelerated, turbulence can be formed on the surface of the inner wall, the process flow state is damaged, meanwhile, when the amount of the first guide plate 51 and the second guide plate 52 is too small, the process operation is realized, the number of the first guide plate 51 and the second guide plate 52 needs to be increased, and the construction cost is invisibly increased.
When d: when the value of c is more than 2.5, because the horizontal path is too long, the sedimentation time of the activated sludge is less than the translation time when the activated sludge reaches the next grid under the state of unpowered stirring at the bottom of the sewage treatment pool, namely, the activated sludge can be sedimented to the bottom of the pool when the activated sludge does not reach the next grid under the gravity flow state, so that the activated sludge is accumulated in the grids and cannot enter the next grid in a suspension state.
By defining the relationship between the water flow direction of the first baffle 51 passing through the channel at the lower part and the water flow direction of the upper cross channel of the second baffle 52 adjacent to the first baffle, when the angle is less than 90 degrees and equal to 90 degrees, the width c of the first baffle 51, the width d of the second baffle 52 and the horizontal path b between the first baffle 51 and the second baffle 52 adjacent to the first baffle are avoided because b: c or d: the value of c is set to be too small, so that the process flow state is damaged, and the construction cost is increased; avoiding b: c or d: c is too large, so that the activated sludge is precipitated in advance, and is accumulated in the grids to block the flow guide channel, thereby failing to complete the process circulation.
Example 2:
in general, in order to adapt the guide wall structure 2 to different sewage treatment tanks 1, the guide channel 4 of the anaerobic zone, the anoxic zone, and the aerobic zone 3, which are formed by dividing the sewage treatment tank by the guide wall structure 2, is adapted to various biochemical sewage treatment apparatuses, depending on the shape of the sewage treatment tank 1 of the biochemical sewage treatment apparatus, which is different in enterprises, different geographical environments, and different sewage treatment requirements, the guide wall structure 2 in example 1 is designed in this embodiment.
In one design of the guide wall structure 2, as shown in fig. 2 to 4, the guide wall structure 2 is located in the sewage treatment tank 1, the guide wall structure 2 is a closed-loop guide wall, and the closed-loop guide wall is not in contact with the side wall of the sewage treatment tank. As shown in fig. 2 to 4, the guide walls of the closed loop structure include a first guide wall 21 and a second guide wall 22 connected end to end, and a guide channel 4 is formed between the outer walls of the first guide wall 21 and the second guide wall 22 and the side wall of the sewage treatment tank 1. One side of the first guide plate 51 and one side of the second guide plate 52 are vertically and fixedly connected with the outer wall of the guide wall of the closed-loop structure, and the other side of the first guide plate 51 and the other side of the second guide plate 52 are vertically and fixedly connected with the side wall of the sewage treatment tank 1.
The inner walls of the first flow guide wall 21 and the second flow guide wall 22 enclose an aerobic zone 3, so that the horizontal height of the first flow guide wall 21 is higher than the horizontal height of the first flow guide plate 51 and the second flow guide plate 52 to avoid the sewage in the multi-grid zone from entering other zones through the first flow guide wall 21 to cause the disordered flow guide of the sewage in the anaerobic zone and the anoxic zone.
In order to facilitate the sewage in the last grid in the anoxic zone to smoothly cross the aerobic zone 3, the width of the second guide wall 22 is smaller than or equal to the width of the second guide plate 52, and the horizontal height of the second guide wall 22 is lower than the horizontal height of the upper crossing channel of the second guide plate 52 at the tail end of the guide channel 4. The horizontal height difference between the second guide wall 22 and the upper cross channel of the second guide plate 51 at the tail end of the guide channel 4 is a, wherein a is more than 0 and less than or equal to 20 cm.
As shown in fig. 2 to 4, the shape of the closed-loop structure guide wall is one of a circular ring type (as shown in fig. 3), an elliptical shape, a runway type (as shown in fig. 4), and a square type (as shown in fig. 2). Here, it should be noted that the shape of the closed-loop structure guide wall may be other closed-loop structures.
In another design of the flow guide wall structure 2, as shown in fig. 5, the flow guide wall structure 2 is located at one end of the sewage treatment tank 1, the flow guide wall structure 2 is used for dividing the sewage treatment tank into an anaerobic zone, an anoxic zone and an aerobic zone 3 which are sequentially connected, and a flow guide channel 4 is arranged between the front end of the anaerobic zone and the front end of the aerobic zone.
Specifically, the water flow path of the flow guide channel 4 may form an S-like (as shown in fig. 5), T-like, pi-like, iii-like water flow channel on the horizontal plane. As shown in fig. 5, the diversion wall structure 2 divides the sewage treatment tank into an anaerobic zone, an anoxic zone and an aerobic zone 3. Sewage flows in the anaerobic zone and the anoxic zone through the S-shaped diversion channels and finally turns over into the aerobic zone 3.
In the two structures of the diversion wall structure 2, when the sewage in the last lattice (i.e. the kth lattice in the embodiment 1) at the tail end of the diversion channel 4 turns over through the diversion wall structure 2, the horizontal height of the diversion wall structure 2 at the turning position is lower than the horizontal height of the upper turning channel on the last second diversion plate 52, wherein the horizontal height difference is a, and a is more than 0 and less than or equal to 20 cm. When the horizontal height difference a is larger than 0, the sewage can smoothly cross the aerobic zone 3.
The principle and method of the water flow structure of the embodiment and embodiment 1 for keeping the activated sludge in the anaerobic zone and the anoxic zone in a suspended state in the sewage treatment device and system are as follows: the diversion wall structure and the sewage diversion structure divide the sewage treatment tank into a plurality of grids areas which are communicated in sequence, such as 28 grids in figure 2, 8 grids in figure 3, 15 grids in figure 4 and 12 grids in figure 5, and the sewage flows in each grid in the plurality of grid areas in the following process:
firstly, sewage enters through a first grid and is mixed with activated sludge returned from a bottom settling tank in the aerobic zone 3 to form sewage mixed liquor;
secondly, sewage is sent into the 1 st grid through the lower part of the front end of the anaerobic zone, enters the 2 nd grid through the upper crossing channel on the second guide plate 52, enters the 3 rd grid through the lower crossing channel of the first guide plate 51 from the 2 nd grid, and so on until the sewage enters the aerobic zone through the last grid;
or the sewage is sent into the 1 st grid through the upper part of the front end of the anaerobic zone, enters the 2 nd grid through the lower part crossing channel of the first guide plate 51, enters the 3 rd grid through the upper part crossing channel on the second guide plate 52 from the 2 nd grid, enters the 4 th grid through the lower part crossing channel of the first guide plate 51 from the 3 rd grid, and so on until the sewage enters the aerobic zone through the last grid.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. The utility model provides a VFL vertical current maze rivers structure for sewage treatment which characterized in that: the sewage treatment device comprises a flow guide wall structure positioned in a sewage treatment tank, wherein the lower end of the flow guide wall structure is fixedly connected with the bottom of the sewage treatment tank; the flow guide wall structure is used for dividing the sewage treatment tank into an anaerobic zone, an anoxic zone and an aerobic zone which are sequentially connected, and a flow guide channel is arranged between the front end of the anaerobic zone and the front end of the aerobic zone;
a sewage guide structure is arranged in the guide channel and comprises a plurality of first guide plates and second guide plates which are arranged at intervals, and the guide channel is divided into a plurality of multi-grid areas which are sequentially communicated by the first guide plates and the second guide plates; the lower part of the first guide plate is provided with a lower sewage passing channel; the lower end of the second guide plate is fixedly connected with the bottom of the sewage treatment tank, and an upper sewage crossing channel is arranged on the second guide plate;
when the angle between the water flow direction of the lower crossing channel and the water flow direction of the upper crossing channel adjacent to the lower crossing channel is less than 90 degrees, the horizontal path distance between the first guide plate and the second guide plate adjacent to the first guide plate is b, the width of the first guide plate is c, and the ratio of (b: c) to (c) is more than or equal to 0.5 and less than or equal to 2.5;
and/or when the angle between the water flow direction of the lower crossing channel and the water flow direction of the upper crossing channel adjacent to the lower crossing channel is equal to 90 degrees, the width of the first guide plate is c, the width of the second guide plate is d, and the ratio of (d: c) to (d: c) is more than or equal to 0.5 and less than or equal to 2.5.
2. The VFL vertical flow labyrinth water flow structure according to claim 1, wherein: the guide wall structure is positioned in the sewage treatment tank, the guide wall structure is a closed-loop guide wall, and the closed-loop guide wall is not in contact with the side wall of the sewage treatment tank;
the closed-loop structure flow guide walls comprise a first flow guide wall and a second flow guide wall which are connected end to end, and flow guide channels are formed between the first flow guide wall and the side wall of the sewage treatment tank and between the second flow guide wall and the side wall of the sewage treatment tank;
the first flow guide wall and the second flow guide wall enclose the aerobic zone, and the horizontal height of the first flow guide wall is higher than the horizontal heights of the first flow guide plate and the second flow guide plate; the horizontal height of the second guide wall is lower than the horizontal height of the upper overturning channel of the second guide plate at the tail end of the guide channel.
3. The VFL vertical flow labyrinth water flow structure according to claim 2, wherein: the shape of the closed loop structure flow guide wall is one of a circular ring shape, an elliptical shape, a runway shape and a square shape.
4. The VFL vertical flow labyrinth water flow structure according to claim 1, wherein: the flow guide wall structure is positioned at one end in the sewage treatment tank, the flow guide wall structure divides the sewage treatment tank into an anaerobic zone, an anoxic zone and an aerobic zone which are sequentially connected, and a flow guide channel is arranged between the front end of the anaerobic zone and the front end of the aerobic zone;
and the flow guide channel forms S-shaped, T-shaped, pi-shaped and III-shaped water flow channels on the horizontal plane from the front end of the anaerobic zone to the sewage water flow path of the aerobic zone through the anoxic zone.
5. A sewage treatment plant comprising a VFL vertical flow labyrinth flow structure as defined in any one of claims 1 to 4.
6. A sewage treatment system comprising the sewage treatment apparatus according to claim 5.
7. A sewage treatment method applied to the sewage treatment system of claim 6.
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