Biological carbon removal device for waste liquid treatment

Abstract

The utility model discloses a biological carbon removal device for waste liquid treatment, which belongs to the technical field of waste liquid treatment and comprises an aeration tank, an aeration mechanism and a stirring mechanism, the aeration mechanism comprises an aeration machine, an aeration pipe and a first aeration head are arranged at the output end of the aeration machine, and the aeration pipe extends into the aeration tank. A plurality of first aeration holes are formed in the surface of the first aeration head in a penetrating manner; the stirring mechanism is arranged in the aeration tank and comprises the following structures: a driving shaft rod vertically extending upwards above the first aeration head, a driving motor arranged at the end part of the driving shaft rod, and a first propeller arranged at one end, close to the first aeration head, of the driving shaft rod; one end, far away from the first aeration head, of the driving shaft rod is provided with a plurality of stirring rods which horizontally extend outwards and a second propeller which is annularly wound; according to the utility model, the mixing strength and contact time of bubbles and waste liquid can be improved, and the dissolved oxygen content in the waste liquid is efficiently improved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste liquid treatment, in particular to a biological carbon removal device for waste liquid treatment. Background Art

[0002] Carbon removal from waste liquids, such as domestic wastewater, is an important wastewater treatment process. Its main purpose is to remove carbon-containing organic pollutants from the wastewater. Biological carbon removal is widely used due to its environmental and sustainable advantages. Biological carbon removal usually requires the use of an aeration tank to promote the growth and reproduction of aerobic microorganisms. Aeration tanks used for wastewater treatment are biochemical reactors designed according to the characteristics of microorganisms. Air or oxygen is delivered to the wastewater in the aeration tank through equipment such as aerators to promote the reproduction of microorganisms in the wastewater, thereby allowing the microorganisms to degrade organic pollutants in the wastewater. Aeration tanks use the activated sludge method to treat wastewater. A certain wastewater residence time is provided in the tank to meet the oxygen requirements of aerobic microorganisms and the mixing conditions for sufficient contact between the wastewater and the activated sludge. Currently, most aeration tanks use aerators and bubble refiners to inject small bubbles into the wastewater to increase the dissolved oxygen content in the wastewater. However, small bubbles entering the wastewater will quickly float up due to buoyancy, resulting in a shorter contact time between the small bubbles and the wastewater, which reduces the oxygen dissolution efficiency. To improve the oxygen dissolution efficiency, it is usually necessary to use a higher-power aerator and install more bubble refiners.

[0003] Chinese patent publication number CN219764763U discloses an integrated tail gas collection aeration tank. During operation, air and a mud-water mixture are separated after passing through a three-phase separator and enter the tail gas treatment device through a gas collecting pipe. The mud-water mixture then enters the overflow weir and is discharged through the gap in the three-phase separator. The aeration tank uses a blower to send gas along the aeration pipe to the aeration head, forming small bubbles in the sewage. However, the small bubbles will quickly float to the surface of the water in the sewage. The contact time between the small bubbles and the sewage is short, and the efficiency of increasing the dissolved oxygen content in the sewage through aeration is low. Therefore, there is still room for improvement in this aeration tank. Utility Model Content

[0004] In view of the technical defects existing in the background technology, the present invention proposes a biological carbon removal device for waste liquid treatment, which solves the above technical problems and meets the actual needs. The specific technical solution is as follows:

[0005] A biological carbon removal device for waste liquid treatment includes an aeration tank, an aeration mechanism, and a stirring mechanism. The aeration mechanism includes the following structures: an aerator, an aeration pipe extending into the aeration tank is provided at the output end of the aerator, a first aeration head is provided at the extended end of the aeration pipe, and a plurality of first aeration holes are formed on the surface of the first aeration head;

[0006] The stirring mechanism is arranged in the aeration tank, and includes the following structure: a driving shaft extending vertically upward above the first aeration head, a driving motor is provided at the end of the driving shaft, a first propeller is provided at the end of the driving shaft close to the first aeration head, and a plurality of stirring rods extending horizontally outward are provided at the end of the driving shaft away from the first aeration head. The extended ends of the plurality of stirring rods are commonly provided with a second propeller arranged in a circular shape.

[0007] As a further technical solution of the present invention, a water inlet and a water inlet pipe matching the water inlet are provided on the top of one side of the aeration tank, and a sewage outlet and a sewage pipe matching the sewage outlet are provided at the bottom of the aeration tank.

[0008] As a further technical solution of the present invention, an inclined surface is formed on the inner bottom of the aeration tank, and the inclined surface is inclined downward from the bottom edge of the aeration tank to the edge of the sewage outlet.

[0009] As a further technical solution of the present invention, the inner wall of the aeration tank is provided with a plurality of vertically extending spoiler ribs.

[0010] As a further technical solution of the present invention, a rotary bearing is sleeved on the surface of the driving shaft, and a plurality of fixing rods extending to the inner wall of the aeration tank and fixedly connected to the aeration tank are provided on the outside of the rotary bearing.

[0011] As a further technical solution of the utility model, the aeration tank is provided with a plurality of second aeration heads distributed in an array outside the first aeration head, the surface of the second aeration head is provided with a plurality of second aeration holes, and the second aeration head is provided with an aeration branch pipe connected to the aeration pipe.

[0012] As a further technical solution of the present invention, the opening of the second aeration hole faces the first aeration head.

[0013] The beneficial effects of the present invention are:

[0014] The utility model transmits air to the waste liquid in the aeration tank through an aerator to increase the oxygen content of the waste liquid, thereby decomposing organic pollutants in the waste liquid through aerobic microorganisms, and the air forms a plurality of small bubbles in the waste liquid through the first aeration head. During the floating process of the small bubbles, the circulation water flow and eddy current formed by the first propeller and the second propeller extend the movement trajectory in the vertical direction and the horizontal direction, thereby improving the mixing intensity and contact time of the small bubbles and the waste liquid, and more efficiently increasing the dissolved oxygen content in the waste liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention is a structural diagram of a biological carbon removal device for waste liquid treatment.

[0016] Figure 2 yes Figure 1 Partial schematic diagram at point A in the middle.

[0017] Figure 3 The present invention is a schematic structural diagram of a second embodiment of a biological carbon removal device for waste liquid treatment.

[0018] Figure 4 yes Figure 3 Partial schematic diagram of point B in the middle.

[0019] Among them: aeration tank 1, water inlet 11, water inlet pipe 12, sewage outlet 13, sewage pipe 14, inclined surface 15, spoiler rib 16, aeration mechanism 2, aerator 21, aeration pipe 22, first aeration head 23, first aeration hole 24, second aeration head 25, second aeration hole 26, aeration branch pipe 27, stirring mechanism 3, drive shaft 31, drive motor 32, first propeller 33, stirring rod 34, second propeller 35, rotating bearing 36, fixing rod 37. DETAILED DESCRIPTION

[0020] The following describes the implementation of the present invention in conjunction with the accompanying drawings and relevant embodiments. The implementation of the present invention is not limited to the following embodiments, and the present invention involves relevant necessary components in this technical field, which should be regarded as common knowledge in this technical field and can be known and mastered by technical personnel in this technical field.

[0021] like Figure 1 、 2 As shown, a biological decarbonization device for waste liquid treatment includes an aeration tank 1, an aeration mechanism 2, and a stirring mechanism 3. The aeration mechanism 2 includes the following structure: an aerator 21, an aeration pipe 22 extending into the interior of the aeration tank 1 is provided at the output end of the aerator 21, a first aeration head 23 is provided at the end of the aeration pipe 22, and a plurality of first aeration holes 24 are pierced on the surface of the first aeration head 23; the stirring mechanism 3 is arranged in the aeration tank 1, and the stirring mechanism 3 includes the following structure: a driving shaft 31 extending vertically upward above the first aeration head 23, a driving motor 32 is provided at the end of the driving shaft 31, a first propeller 33 is provided at one end of the driving shaft 31 close to the first aeration head 23, and a plurality of stirring rods 34 extending horizontally outward are provided at one end of the driving shaft 31 away from the first aeration head 23, and a second propeller 35 arranged in a circular shape is provided at the extended ends of the plurality of stirring rods 34.

[0022] The utility model is a device for biological carbon removal of waste liquid based on aerobic microorganisms. After the waste liquid is injected into the aeration tank 1, a large number of small bubbles are generated in the aeration tank 1 by using the aeration mechanism 2 to increase the dissolved oxygen content in the waste liquid. Under sufficient oxygen supply, aerobic microorganisms use organic matter adsorbed on the cell surface to carry out oxidative decomposition reaction. During the reaction process, the organic matter is gradually oxidized into carbon dioxide and water, thereby purifying the waste liquid. Specifically, the aerator 21 is connected to the external power supply line through a power supply cable and operates. When the aerator 21 is running, it will generate air with a certain pressure and transport the air along the aeration pipe 22 to the first aeration head 2. 3, the first aeration head 23 adopts a structure similar to a bubble refiner. Air is discharged from the waste liquid through a plurality of first aeration holes 24 to form a plurality of small bubbles, thereby increasing the specific surface area of ​​the air and more efficiently increasing the dissolved oxygen content in the waste liquid. The increased dissolved oxygen content in the waste liquid is conducive to promoting the reproduction and growth of aerobic microorganisms. During the growth process, the microorganisms degrade the organic pollutants in the waste liquid into small molecules such as carbon dioxide and water. At the same time, some sticky substances such as polysaccharides and proteins are produced during the growth process of the microorganisms. These substances can combine with the suspended pollution particles in the waste liquid to form flocs, thereby completing the biological decarbonization of the waste liquid.

[0023] The stirring mechanism 3 of the present invention is used to improve the mixing intensity and contact time of the waste liquid and oxygen. Specifically, the driving motor 32 is fixedly connected to the aeration tank 1 through a bracket and other structures. The driving motor 32 is connected to the external power supply line through a power supply cable and operates. The driving motor 32 drives the driving shaft 31 to rotate so that the first propeller 33 and the second propeller 35 rotate synchronously. A plurality of propeller blades are distributed on the surface of the first propeller 33 and the second propeller 35 in an array. The rotating first propeller 33 can make the waste liquid just above the first aeration head 23 form a first water flow flowing downward, and the second propeller 33 can make the waste liquid just above the first aeration head 23 form a first water flow flowing downward. 35 is fixedly connected to the drive shaft 31 through the stirring rod 34. The second propeller 35 is located just above the edge of the first propeller 33. The position of the second propeller 35 is staggered with the first propeller 33. Therefore, the rotating second propeller 35 will cause the waste liquid to form a second water flow that flows downward and is staggered with the position of the first water flow. Under the joint action of the first water flow and the second water flow, the waste liquid close to the inner wall of the aeration tank 1 forms a third water flow that flows upward, so that the waste liquid circulates in the aeration tank 1. In addition, the waste liquid will form a vortex during the rotation of the first propeller 33 and the second propeller 35.

[0024] Furthermore, after being discharged from the first aeration head 23, the small bubbles move upward under the action of buoyancy until they come into contact with the first water flow. Under the action of the first water flow, the small bubbles move downward with the first water flow. During this process, the small bubbles will move slightly downward and gradually approach the inner wall of the aeration tank 1 until they leave the range of the first water flow. Then, the small bubbles will float up again and come into contact with the second water flow. Under the action of the second water flow, the small bubbles move downward with the second water flow. During this process, the small bubbles will again move slightly downward and further approach the inner wall of the aeration tank 1 until they come into contact with the third water flow. Finally, the small bubbles will float to the liquid surface under the action of the third water flow. Based on the above method, the small bubbles move in the waste liquid in a W-shaped trajectory in the vertical direction. At the same time, under the action of the vortex, the small bubbles move in a spiral motion in the horizontal direction, thereby increasing the mixing intensity of the waste liquid and oxygen. Therefore, under the combined action of the circulating water flow and the vortex, the movement path of the small bubbles in the waste liquid is significantly increased, thereby increasing the contact time between the small bubbles and the waste liquid, and more efficiently increasing the dissolved oxygen content in the waste liquid.

[0025] To sum up, the utility model uses the aerator 21 to transport air to the waste liquid in the aeration tank 1 to increase the oxygen content of the waste liquid, thereby decomposing organic pollutants in the waste liquid through aerobic microorganisms. The air forms a number of small bubbles in the waste liquid through the first aeration head 23. During the floating process of the small bubbles, the circulating water flow and vortex formed by the first propeller 33 and the second propeller 35 extend the vertical and horizontal movement trajectories, thereby improving the mixing intensity and contact time of the small bubbles and the waste liquid, and more efficiently increasing the dissolved oxygen content in the waste liquid.

[0026] like Figure 1 As shown, as one of the preferred embodiments of the present invention, a water inlet 11 and a water inlet pipe 12 matching the water inlet 11 are provided at the top of one side of the aeration tank 1, and a sewage outlet 13 and a sewage outlet 14 matching the sewage outlet 13 are provided at the bottom of the aeration tank 1; the aeration tank 1 is connected to the upper-level waste liquid treatment device through the water inlet pipe 12, and the waste liquid is drained to the water inlet 11 through the water inlet pipe 12 after the upper-level treatment and enters the aeration tank 1. After the waste liquid undergoes biological decarbonization to remove organic pollutants in the aeration tank 1, a certain amount of activated sludge will be formed at the bottom of the aeration tank 1. After the waste liquid completes biological decarbonization in the aeration tank 1, the waste liquid and activated sludge are discharged from the sewage outlet 13 to the sewage outlet 14. In addition, an electronic valve can be set at the intersection of the sewage outlet 14 and the aeration tank 1, and the electronic valve is used to control the sewage outlet 14 to be closed or connected to the aeration tank 1, thereby accurately controlling the sewage discharge process.

[0027] like Figure 1As shown, as one of the preferred embodiments of the present invention, an inclined surface 15 is formed at the inner bottom of the aeration tank 1, and the inclined surface 15 is inclined downward from the bottom edge of the aeration tank 1 to the edge of the sewage outlet 13; the inclined surface 15 can make the activated sludge at the bottom of the aeration tank 1 better gather at the sewage outlet 13, avoiding excessive activated sludge remaining at the bottom of the aeration tank 1 during the sewage discharge process.

[0028] like Figure 1 As shown in FIG. 1 , as one of the preferred embodiments of the present invention, a plurality of vertically extending spoiler ribs 16 are provided on the inner wall of the aeration tank 1 ; when the stirring mechanism 3 is in operation, the waste liquid will form a vortex, and the spoiler ribs 16 can have a spoiler effect on the vortex, causing the direction and speed of the vortex to change, thereby increasing the mixing intensity of the small bubbles and the waste liquid.

[0029] like Figure 1 As shown, as one of the preferred embodiments of the present invention, a rotating bearing 36 is provided on the surface of the driving shaft 31, and a plurality of fixing rods 37 extending to the inner wall of the aeration tank 1 and fixedly connected to the aeration tank 1 are provided on the outside of the rotating bearing 36; the fixing rods 37 are used to constrain the driving shaft 31 to make it more stable during rotation, and a rotating bearing 36 is provided at the intersection of the fixing rods 37 and the driving shaft 31. The rotating bearing 36 can reduce the friction force on the driving shaft 31 during rotation, thereby improving the smoothness of the rotation of the driving shaft 31.

[0030] like Figure 3 、 4 As shown, as a second preferred embodiment of the present invention, the aeration tank 1 is provided with a plurality of second aeration heads 25 distributed in an array outside the first aeration head 23, and a plurality of second aeration holes 26 are pierced on the surface of the second aeration head 25. The second aeration head 25 is provided with an aeration branch pipe 27 connected to the aeration pipe 22, and the opening of the second aeration hole 26 is toward the first aeration head 23; the aeration branch pipe 27 is provided with an electronic valve for controlling whether air can pass through. Since the oxygen demand of microorganisms in the waste liquid is different at different stages, when the oxygen demand of the microorganisms is large, the aeration branch pipe 27 is opened by the electronic valve to allow air to pass through the plurality of second aeration heads 25 to form more small bubbles in the waste liquid, thereby more efficiently increasing the dissolved oxygen content in the waste liquid, thereby making the dissolved oxygen content in the waste liquid adapt to the growth and reproduction of microorganisms.

[0031] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A biological carbon removal device for waste liquid treatment, comprising an aeration tank (1), an aeration mechanism (2), and a stirring mechanism (3), characterized in that: The aeration mechanism (2) comprises the following structures: an aerator (21); an aeration pipe (22) extending into the interior of the aeration tank (1) is provided at the output end of the aerator (21); a first aeration head (23) is provided at the end of the aeration pipe (22); and a plurality of first aeration holes (24) are provided on the surface of the first aeration head (23); The stirring mechanism (3) is arranged in the aeration tank (1), and the stirring mechanism (3) comprises the following structure: a driving shaft (31) extending vertically upward above the first aeration head (23), a driving motor (32) being provided at the end of the driving shaft (31), a first propeller (33) being provided at one end of the driving shaft (31) close to the first aeration head (23), a plurality of stirring rods (34) extending horizontally outward at one end of the driving shaft (31) away from the first aeration head (23), and a second propeller (35) being provided at the ends of the extending plurality of stirring rods (34) being provided in a circular shape.

2. The biological carbon removal device for waste liquid treatment according to claim 1, characterized in that: A water inlet (11) and a water inlet pipe (12) matching the water inlet (11) are provided at the top of one side of the aeration tank (1), and a sewage outlet (13) and a sewage outlet pipe (14) matching the sewage outlet (13) are provided at the bottom of the aeration tank (1).

3. The biological carbon removal device for waste liquid treatment according to claim 2, characterized in that: An inclined surface (15) is formed on the inner bottom of the aeration tank (1), and the inclined surface (15) slopes downward from the bottom edge of the aeration tank (1) to the edge of the sewage outlet (13).

4. The biological carbon removal device for waste liquid treatment according to claim 1, characterized in that: The inner wall of the aeration tank (1) is provided with a plurality of vertically extending flow-disturbing ribs (16).

5. The biological carbon removal device for waste liquid treatment according to claim 1, characterized in that: A rotating bearing (36) is sleeved on the surface of the driving shaft (31), and a plurality of fixing rods (37) extending to the inner wall of the aeration tank (1) and fixedly connected to the aeration tank (1) are provided on the outside of the rotating bearing (36).

6. The biological carbon removal device for waste liquid treatment according to claim 1, characterized in that: The aeration tank (1) is provided with a plurality of second aeration heads (25) distributed in an array outside the first aeration head (23), a plurality of second aeration holes (26) are formed on the surface of the second aeration head (25), and the second aeration head (25) is provided with an aeration branch pipe (27) connected to the aeration pipe (22).

7. The biological carbon removal device for waste liquid treatment according to claim 6, characterized in that: The opening of the second aeration hole (26) faces the first aeration head (23).

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