Rotational flow air flotation sedimentation tank for sewage treatment

Abstract

The utility model discloses a rotational flow air flotation sedimentation tank for sewage treatment, and belongs to the technical field of environment-friendly sewage treatment. The device comprises a tank body, a first deslagging device is arranged on the tank body, and a central cylinder, a gas dissolving device, a separator and a second deslagging device are arranged in the tank body; wastewater enters the center cylinder through the water inlet pipe, primary treatment is conducted on the wastewater through the center cylinder, secondary treatment is conducted on the wastewater through the gas dissolving device and the separator, and treated suspended solids and sand grains are discharged through the first deslagging device and the second deslagging device. Sand grains in wastewater are separated through the cyclone, oil suspended matters in the wastewater are removed through the cyclone effect and the air flotation effect, the flow ratio of the bottom water outlet pipe to the water outlet overflow pipe is adjusted through the liquid level height of the water outlet tank, the treatment effect is guaranteed, the occupied area of the equipment is small, the adaptability to water quality is high, and the equipment is suitable for large-scale popularization and application. Sand grains and oil suspended matters in the wastewater can be effectively removed.

Description

Technical Field

[0001] The utility model belongs to the technical field of environmentally friendly sewage treatment, and in particular relates to a cyclone flotation sedimentation tank for sewage treatment. Background Art

[0002] During the transportation of sewage, sand and oil substances are often generated. In sewage treatment plants, aerated grit chambers or cyclone grit chambers are often used to remove sand from wastewater. Aerated sedimentation tanks occupy a large area and are inconvenient to operate and manage. When using the cyclone grit chamber of the prior art, due to the distance and height difference between the sand and water conveying pipeline and the separator, the sand and water mixture entering the separator carries a certain degree of potential energy, causing a part of the separated sand and water to be mixed again and enter the effluent, thereby reducing the removal rate of sand. And when there is oil in the sewage, a simple grit chamber cannot effectively remove the oil in the sewage, which is not conducive to obtaining relatively pure sand. Utility Model Content

[0003] In response to the problems existing in the existing aerated grit tank and cyclone grit tank mentioned in the background technology, the utility model proposes a cyclone flotation sedimentation tank for sewage treatment, which can effectively separate sand particles in wastewater and remove oil suspended matter in wastewater. The equipment occupies a small area, has strong adaptability to water quality and good treatment effect.

[0004] Technical solution: In order to solve the above technical problems, the technical solution adopted by the utility model is as follows:

[0005] A cyclone flotation sedimentation tank for sewage treatment comprises a tank body, wherein a first slag discharge device is arranged on the tank body, and a central tube, an air dissolving device, a separator and a second slag discharge device are arranged inside the tank body; wastewater enters the central tube through a water inlet pipe, the central tube is used to perform primary treatment on the wastewater, the air dissolving device and the separator are used to perform secondary treatment on the wastewater, and the treated suspended matter and sand are discharged through the first slag discharge device and the second slag discharge device.

[0006] Preferably, the first slag discharge device includes a slag trough, a slag scraper and a slag discharge pipe; the slag scraper is arranged at the top of the pool body, and a slag discharge pipe is provided at the bottom end of the slag trough. The slag scraper is used to scrape the slag on the surface of the wastewater into the slag trough and discharge it through the slag discharge pipe.

[0007] Preferably, an upper cyclone, a connecting component and a lower cyclone are sequentially arranged in the central tube from top to bottom; the upper cyclone is connected to the lower cyclone through the connecting component, and a guide plate is arranged at the outlet end of the lower cyclone.

[0008] Preferably, the upper cyclone is connected to a water inlet pipe and a cyclone overflow pipe.

[0009] Preferably, an outlet pipe upper baffle and an outlet pipe lower baffle are provided in the guide plate, and the outlet pipe lower baffle is arranged below the outlet pipe upper baffle.

[0010] Preferably, an output device is provided at the side end of the pool body, and the output device includes a bottom water outlet pipe, a water outlet trough, a water outlet overflow pipe and a water outlet regulating pipe; the bottom water outlet pipe, the water outlet overflow pipe and the water outlet regulating pipe are respectively connected to the water outlet trough, one end of the bottom water outlet pipe is penetrated and arranged on the lower baffle of the water outlet pipe, and one end of the water outlet overflow pipe is connected to the pool body.

[0011] Preferably, the dissolved air device comprises a dissolved air water outlet pipe and a dissolved air pump; one end of the dissolved air water outlet pipe passes through the bottom outlet pipe and is arranged on the outlet pipe upper baffle, and the other end is connected to the dissolved air pump.

[0012] Preferably, the separator is arranged on the inner wall of the tank body.

[0013] Preferably, the second slag discharge device comprises a mud bucket and a mud discharge pipe, the mud bucket is located below the separator, and the mud discharge pipe is arranged on the mud bucket.

[0014] Preferably, a water outlet baffle is provided on the top of the pool body, and the water outlet baffle is on the same side as the water outlet overflow pipe.

[0015] Beneficial effects: Compared with the prior art, the utility model has the following advantages:

[0016] (1) The utility model is provided with an upper cyclone, and utilizes the cyclone effect and the flotation effect to separate the sand, oil and lighter suspended matter in the wastewater. The oil and lighter suspended matter are discharged into the scum tank through the slag discharge pipe, and the wastewater and the heavier sand enter the lower cyclone through the connecting component; in the lower cyclone, the sand is thrown to the outer wall by the centrifugal force, and the sand enters the sedimentation area from the upper baffle of the outlet pipe and falls into the mud bucket. The heavier sand is discharged by opening the mud discharge pipe; most of the separated wastewater flows out from the flow channel between the upper baffle of the outlet pipe and the lower baffle of the outlet pipe, and the remaining wastewater continues to flow upward from the bottom of the outlet baffle after passing through the separator.

[0017] The utility model equipment occupies a small area, has a strong adaptability to water quality, and can effectively remove sand particles and oil suspended matter in waste water.

[0018] (2) The utility model is provided with a first slag removal device at the upper end of the tank body. By starting the reduction motor to drive the scraper plate to rotate in a circle, the scraper plate scrapes the slag on the liquid surface of the sedimentation tank into the slag tank.

[0019] (3) The utility model is provided with an output device at the side end of the pool body. The liquid level in the water outlet trough can be adjusted through the water outlet regulating pipe in the water outlet trough. The flow in the bottom water outlet pipe and the water outlet overflow pipe is controlled by controlling the liquid level in the water outlet trough. The higher the liquid level in the water outlet trough, the smaller the flow in the bottom water outlet pipe. The sedimentation time of the wastewater is controlled by controlling the flow in the water outlet overflow pipe to ensure the sedimentation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of a cyclone flotation sedimentation tank for sewage treatment of the utility model;

[0021] In the figure: 1, tank body; 2, center tube; 3, upper cyclone; 4, lower cyclone; 5, connecting parts; 6, guide plate; 7, dissolved air water outlet pipe; 8, bottom outlet pipe; 9, cyclone overflow pipe; 10, water inlet pipe; 11, outlet pipe upper baffle; 12, outlet pipe lower baffle; 13, separator; 14, outlet baffle; 15, scum trough; 16, outlet trough; 17, outlet overflow pipe; 18, outlet regulating pipe; 19, slag discharge pipe; 20, mud bucket; 21, dissolved air pump; 22, mud discharge pipe; 23, scraper. DETAILED DESCRIPTION

[0022] The present invention will be further explained below in conjunction with specific embodiments. The embodiments are implemented based on the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0023] like Figure 1 As shown, the cyclone flotation sedimentation tank for sewage treatment provided in this embodiment has a main structure including a tank body 1, a water inlet pipe 10, a first slag discharge device, a central tube 2, an air dissolving device, a separator, a second slag discharge device and an output device; a first slag discharge device is provided on the tank body 1, and a central tube 2, an air dissolving device, a separator and a second slag discharge device are provided inside the tank body 1; the output device is arranged at the side end of the tank body 1.

[0024] like Figure 1 As shown, the first slag discharge device includes a slag trough 15, a slag scraper 23 and a slag discharge pipe 19; the slag trough 15 is located on the top side of the tank body 1, the slag scraper 23 is arranged at the top of the tank body 1, and the slag discharge pipe 19 is arranged at the bottom end of the slag trough 15; the slag scraper 23 includes a reduction motor and a scraper plate, and the scraper plate is driven to rotate in a circle by starting the reduction motor, and the scraper plate scrapes the slag on the liquid surface of the sedimentation tank into the slag trough 15.

[0025] A water outlet baffle 14 is provided on the top of the pool body 1 , and the water outlet from the top of the pool body 1 flows out of the sedimentation tank from the bottom of the water outlet baffle 14 and enters the water outlet trough 16 through the water outlet overflow pipe 17 .

[0026] In this embodiment, the speed of the reduction motor is 5 to 20 r / min, the bottom of the scraper plate is 5 to 10 mm away from the liquid surface, the scraper plates are symmetrically arranged on both sides of the central tube 2, and the length of the single-sided scraper plate is 2 to 5 cm smaller than the distance between the water outlet baffle 14 and the central tube 2.

[0027] like Figure 1 As shown, the central tube 2 includes an upper cyclone 3, a connecting component 5, a lower cyclone 4 and a guide plate 6; the upper cyclone 3, the connecting component 5 and the lower cyclone 4 are arranged in sequence from top to bottom in the central tube 2; the upper cyclone 3 is connected to the lower cyclone 4 through the connecting component 5, and the guide plate 6 is connected to the outlet end of the lower cyclone 4; a cyclone overflow pipe 9 is provided on the upper cyclone 3, and the cyclone overflow pipe 9 is connected to the scum tank 15.

[0028] The side end of the upper cyclone 3 is connected to the water inlet pipe 10, and the inlet of the upper cyclone 3 is connected to the water inlet pipe 10 by a flange. The water inlet flow rate of the water inlet pipe 10 is 1-5 m / s, and the water inlet pressure of the water inlet pipe 10 is 0.06-0.3 Mpa.

[0029] The inner walls of the upper cyclone 3 and the lower cyclone 4 are made of wear-resistant material. In this embodiment, the inner walls of the upper cyclone 3 and the lower cyclone 4 are selected from any one of new wear-resistant high-alumina ceramics (corundum ceramics), KM ceramic composite materials, high wear-resistant rubber, polyurethane and composite ceramic materials.

[0030] In this embodiment, the cone angle of the upper cyclone 3 is 20-40°, the cone angle of the lower cyclone 4 is 30-60°, the ratio of the cylinder length to the cylinder diameter of the upper cyclone 3 is 1:1-2:1, and the ratio of the cylinder length to the cylinder diameter of the lower cyclone 4 is 0.5:1-2:1.

[0031] The guide plate 6 is a cone-shaped cylinder, the top of which is connected to the cylinder of the lower cyclone 4. The bottom diameter of the guide plate 6 differs from the diameter of the central cylinder 2 by 5 to 10 cm, and the bottom height of the guide plate 6 is 20 to 30 cm lower than the bottom height of the lower baffle 12 of the outlet pipe.

[0032] An outlet pipe upper baffle 11 and an outlet pipe lower baffle 12 are provided in the guide plate 6. The outlet pipe lower baffle 12 is arranged below the outlet pipe upper baffle 11, and a gap is left between the outlet pipe upper baffle 11 and the outlet pipe lower baffle 12 to facilitate the entry of wastewater.

[0033] An output device is provided at the side end of the pool body 1, and the output device includes a bottom water outlet pipe 8, a water outlet trough 16, a water outlet overflow pipe 17 and a water outlet regulating pipe 18; the water outlet trough 16 is provided at the side end of the pool body 1, the water inlet end of the bottom water outlet pipe 8 is penetrated and provided on the lower baffle plate 12 of the water outlet pipe, the water outlet end of the bottom water outlet pipe 8 is connected to the water outlet trough 16, one end of the water outlet overflow pipe 17 is connected to the top of the pool body 1, and the other end is connected to the water outlet trough 16, and a water outlet regulating pipe 18 is provided at the outlet end of the water outlet trough 16.

[0034] The outlet regulating pipe 18 includes a fixed pipe and a rotating pipe, which are connected by a rotating component. The liquid level of the outlet trough 16 is controlled by adjusting the angle of the rotating pipe. The flow of the bottom outlet pipe 8 is controlled by the liquid level of the outlet trough 16. The liquid level of the outlet trough 16 differs from the liquid level at the top of the pool body 1 by 10 to 30 cm.

[0035] In this embodiment, the water outlet tank 16 is connected to the dissolved air pump 21 , and the water inlet end of the bottom water outlet pipe 8 is located above the lower baffle plate 12 of the water outlet pipe.

[0036] A dissolved air device is provided below the central tube 2, and the dissolved air device includes a dissolved air water outlet pipe 7 and a dissolved air pump 21; the outlet end of the dissolved air water outlet pipe 7 passes through the inlet end of the bottom outlet pipe 8, forms a sleeve structure with the bottom outlet pipe 8, and is penetrated on the baffle plate 11 on the outlet pipe, and the dissolved air pump 21 is connected to the dissolved air water outlet pipe 7.

[0037] In this embodiment, the outlet end of the dissolved air water outlet pipe 7 is 2 to 3 cm higher than the top of the water outlet upper baffle, and the outlet end of the dissolved air water outlet pipe 7 is connected to the dissolved air releaser.

[0038] In this embodiment, the upper baffle plate 11 of the outlet pipe is on the same side as the lower baffle plate 12 of the outlet pipe, and most of the separated wastewater flows out from the flow channel between the upper baffle plate 11 of the outlet pipe and the lower baffle plate 12 of the outlet pipe, and then enters the outlet trough 16 through the bottom outlet pipe 8.

[0039] In this embodiment, the flow rate of the air dissolving pump 21 is 1-5% of the flow rate of the water inlet pipe 10, and the gas-liquid ratio of the air dissolving pump 21 is 8-10%.

[0040] In this embodiment, the pool body 1 is cylindrical, and the separator 13 is arranged on the inner wall of the pool body 1. The separator is a two-layer structure, composed of a plurality of hollow steel pipes, which are horizontally placed in the pool body. The cross-section of the hollow steel pipe is a rhombus, wherein the two symmetry axes of the rhombus are respectively in the horizontal direction and the vertical direction, and the upper and lower angles of the rhombus in the vertical direction are 50 to 60°. The upper and lower layers of hollow steel pipes in the horizontal direction are staggered, and the channel width of the upper and lower layers of the separator 13 is 3 to 5 cm.

[0041] The heavier suspended matter in the wastewater is separated by the separator 13 , and the oil in the wastewater is removed by the bubbles provided by the air dissolving pump 21 . The oil and the lighter suspended matter become scum and are scraped to the scum tank 15 by the scraper 23 .

[0042] The second slag discharge device includes a mud bucket 20 and a mud discharge pipe 22 . The mud bucket 20 is located below the separator 13 , and the mud discharge pipe 22 is arranged at the bottom end of the mud bucket 20 .

[0043] The working principle or use process of the utility model is as follows: first, the water inlet pipe 10 is opened, and the wastewater enters the upper cyclone 3 from the water inlet pipe 10. In the upper cyclone 3, the oil substances and suspended matter in the wastewater react with tiny bubbles to form scum. The scum and the wastewater are separated by the centrifugal force generated by the cyclone flow of the wastewater in the upper cyclone 3. The separated scum enters the scum tank 15 through the cyclone overflow pipe 9, and the wastewater and heavier sand particles enter the lower cyclone 4 through the connecting component 5. At the same time, the air dissolving pump 21 is started to dissolve the air. The air pump 21 extracts the water in the water tank 16 to produce dissolved air water. At this time, the dissolved air water is full of a large number of fine bubbles. The dissolved air water is released into the water inside the lower cyclone 4 through the dissolved air releaser at the upper end of the dissolved air water inlet pipe 10. The small bubbles slowly rise and adhere to oil substances and lighter suspended matter to form scum. In the lower cyclone 4, the sand particles are thrown to the outer wall by centrifugal force, and the sand particles enter the sedimentation area from the baffle 11 on the outlet pipe and fall into the mud bucket 20. The heavier sand particles are discharged by opening the mud discharge pipe 22.

[0044] Most of the separated wastewater flows out from the flow channel between the upper baffle 11 and the lower baffle 12 of the outlet pipe, and then enters the outlet trough 16 through the bottom outlet pipe 8. The remaining wastewater passes through the separator 13 and then continues to flow upward from the bottom of the outlet baffle 14, and enters the outlet trough 16 through the outlet overflow pipe 17. The wastewater is separated from heavier suspended matter by the separator 13, and the oil substances in the wastewater are removed by the bubbles provided by the dissolved air pump 21. The oil substances and the lighter suspended matter become scum and are scraped to the scum tank 15 by the scraper 23. The liquid level height in the outlet trough 16 can be adjusted by the outlet regulating pipe 18 in the outlet trough 16. The flow rates in the bottom outlet pipe 8 and the outlet overflow pipe 17 are controlled by controlling the liquid level height of the outlet trough 16. The higher the liquid level of the outlet trough 16, the smaller the flow rate of the bottom outlet pipe 8. The sedimentation time of the wastewater is controlled by controlling the flow rate of the outlet overflow pipe 17 to ensure the sedimentation effect.

[0045] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A cyclone flotation sedimentation tank for sewage treatment, comprising a tank body (1), characterized in that: The tank body (1) is provided with a first slag discharge device, and the tank body (1) is provided with a central tube (2), a gas dissolving device, a separator, and a second slag discharge device; waste water enters the central tube (2) through a water inlet pipe (10), the central tube (2) is used to perform a primary treatment on the waste water, the gas dissolving device and the separator are used to perform a secondary treatment on the waste water, and the treated suspended matter and sand particles are discharged through the first slag discharge device and the second slag discharge device.

2. The cyclone flotation sedimentation tank for sewage treatment according to claim 1, characterized in that: The first slag discharge device comprises a slag trough (15), a slag scraper (23) and a slag discharge pipe (19); the slag scraper (23) is arranged at the top of the pool body (1), and the slag discharge pipe (19) is arranged at the bottom of the slag trough (15); the slag on the surface of the wastewater is scraped into the slag trough (15) by the slag scraper (23) and discharged through the slag discharge pipe (19).

3. The cyclone flotation sedimentation tank for sewage treatment according to claim 1, characterized in that: An upper cyclone (3), a connecting component (5) and a lower cyclone (4) are arranged in sequence from top to bottom in the central tube (2); the upper cyclone (3) is connected to the lower cyclone (4) via the connecting component (5), and a guide plate (6) is arranged at the outlet end of the lower cyclone (4).

4. The cyclone flotation sedimentation tank for sewage treatment according to claim 3, characterized in that: The upper cyclone (3) is connected to a water inlet pipe (10) and a cyclone overflow pipe (9).

5. The cyclone flotation sedimentation tank for sewage treatment according to claim 3, characterized in that: An outlet pipe upper baffle (11) and an outlet pipe lower baffle (12) are provided in the guide plate (6), and the outlet pipe lower baffle (12) is arranged below the outlet pipe upper baffle (11).

6. The cyclone flotation sedimentation tank for sewage treatment according to claim 1, characterized in that: An output device is provided at the side end of the pool body (1), the output device comprising a bottom water outlet pipe (8), a water outlet trough (16), a water outlet overflow pipe (17) and a water outlet regulating pipe (18); the bottom water outlet pipe (8), the water outlet overflow pipe (17) and the water outlet regulating pipe (18) are respectively connected to the water outlet trough (16); one end of the bottom water outlet pipe (8) is arranged on a lower baffle plate (12) of the water outlet pipe, and one end of the water outlet overflow pipe (17) is connected to the pool body (1).

7. The cyclone flotation sedimentation tank for sewage treatment according to claim 1, characterized in that: The gas dissolving device comprises a gas-dissolving water outlet pipe (7) and a gas-dissolving pump (21); one end of the gas-dissolving water outlet pipe (7) passes through a bottom outlet pipe (8) and is arranged on an outlet pipe upper baffle (11), and the other end is connected to the gas-dissolving pump (21).

8. The cyclone flotation sedimentation tank for sewage treatment according to claim 1, characterized in that: The separator (13) is arranged on the inner wall of the tank body (1).

9. The cyclone flotation sedimentation tank for sewage treatment according to claim 1, characterized in that: The second slag discharge device comprises a mud bucket (20) and a mud discharge pipe (22); the mud bucket (20) is located below the separator (13); and the mud discharge pipe (22) is arranged on the mud bucket (20).

10. The cyclone flotation sedimentation tank for sewage treatment according to claim 1, characterized in that: A water outlet baffle (14) is provided on the top of the pool body (1), and the water outlet baffle (14) is on the same side as the water outlet overflow pipe (17).

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