Biological carbon removal aeration tank for sewage treatment

Abstract

The utility model discloses a biological carbon removal aeration tank for sewage treatment, which belongs to the technical field of aeration tanks and comprises an aeration tank body and an aeration mechanism, a water inlet pipe is arranged on one side of the top of the aeration tank body, a silt discharge port is arranged at the bottom of the aeration tank body, a silt discharge pipe is arranged at the bottom of the silt discharge port, and a silt discharge valve is arranged at the junction of the silt discharge port and the silt discharge pipe; the aeration mechanism comprises the following structures: an aeration fan, the aeration fan is connected with a control valve through a pipeline, the control valve is provided with an aeration pipe extending into the aeration tank body, the aeration pipe is provided with a plurality of first aeration heads and a plurality of second aeration heads, the first aeration heads are provided with a plurality of first aeration holes with upward openings, and the second aeration heads are provided with a plurality of second aeration holes with upward openings; the second aeration head is provided with a plurality of second aeration holes with downward openings, and the first aeration head and the second aeration head are positioned on the inner side of the aeration tank body; according to the utility model, the efficiency of degrading organic pollutants in sewage by microorganisms can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of aeration tanks, in particular to a biological carbon removal aeration tank for sewage treatment. Background Art

[0002] Carbon removal from organic wastewater is an important wastewater treatment process, and its main purpose is to remove carbon-containing organic pollutants from wastewater. Among them, biological carbon removal is widely used due to its environmental protection and sustainability. Biological carbon removal usually requires the use of an aeration tank to promote the growth and reproduction of microorganisms. The aeration tank used for sewage treatment is a biochemical reactor designed according to the characteristics of microorganisms. Air or oxygen is transported to the sewage in the aeration tank through aerators and other equipment to promote the reproduction of microorganisms in the sewage, thereby degrading organic pollutants in the sewage through microorganisms. The aeration tank uses the activated sludge method to treat sewage. A certain sewage retention time is provided in the tank to meet the oxygen required by aerobic microorganisms and the mixing conditions for full contact between sewage and activated sludge. In order to ensure the sewage treatment effect, most aeration tanks are equipped with stirring devices such as propellers. The sewage is stirred by the stirring device to avoid precipitation at the bottom of the aeration tank, but the stirring device is prone to damage to microbial cells, thereby affecting the reproduction of microorganisms.

[0003] A Chinese patent with publication number CN214360843U discloses an aeration tank for municipal sewage treatment, including an aeration tank body, the aeration tank body including an aeration tank body, the aeration tank body including a water outlet pipe, an air inlet pipe and an aeration pipe, a water outlet pipe is inserted and installed on one side of the aeration tank body, a stirring mechanism is fixedly installed on the top of the aeration tank body, a water inlet pipe is inserted and installed on one side of the aeration tank body, an automatic water-saving valve is fixedly installed inside the water inlet pipe, a filtering mechanism is fixedly installed on one side of the aeration tank body, and an air inlet pipe is fixedly installed inside the aeration tank body; the aeration tank is provided with a stirring mechanism, and a stirring rod is driven to rotate by a motor so that sewage and activated sludge are fully contacted, but during the rotation of the stirring rod, the blades on the surface of the stirring rod are easily collided with microorganisms, resulting in damage to microbial cells, thereby affecting the reproduction of microorganisms in the aeration tank, so there is still room for improvement. Utility Model Content

[0004] In view of the technical defects existing in the background technology, the utility model proposes a biological carbon removal aeration tank for sewage treatment, which solves the above technical problems and meets the actual needs. The specific technical solution is as follows:

[0005] A biological carbon removal aeration tank for sewage treatment, comprising an aeration tank body and an aeration mechanism, wherein a water inlet pipe is arranged on one side of the top of the aeration tank body, a silt discharge port is arranged at the bottom of the aeration tank body, a silt discharge pipe is arranged at the bottom of the silt discharge port, and a silt discharge valve is arranged at the intersection of the silt discharge port and the silt discharge pipe;

[0006] The aeration mechanism includes the following structure: an aeration fan, wherein the aeration fan is connected to a control valve through a pipeline, the control valve is provided with an aeration pipe extending into an aeration tank body, the aeration pipe is provided with a plurality of first aeration heads and a plurality of second aeration heads, the first aeration head is provided with a plurality of first aeration holes opening upward, the second aeration head is provided with a plurality of second aeration holes opening downward, and the first aeration head and the second aeration head are both located inside the aeration tank body.

[0007] As a further technical solution of the utility model, the aeration pipe includes a first air pipe and a second air pipe that are adjacent to each other, the control valve is provided with a gas inlet and two gas outlets, the gas inlet is connected to the aeration fan, and the two gas outlets are respectively connected to the first air pipe and the second air pipe.

[0008] As a further technical solution of the utility model, the first air pipe extends to the inner side of the aeration tank body through a plurality of branches, and the first aeration head is located on the branches of the first air pipe.

[0009] As a further technical solution of the utility model, the second air pipe extends to the inner side of the aeration tank body through a plurality of branches, the second aeration head is located on the branches of the second air pipe, and the bottom of the second aeration head is close to the inner bottom of the aeration tank body.

[0010] As a further technical solution of the utility model, there are several silt discharge ports, and the several silt discharge ports are set as several silt discharge port groups according to their setting positions. The silt discharge port groups each include at least one silt discharge port, and the bottoms of the silt discharge port groups are commonly connected to the same silt discharge pipe.

[0011] As a further technical solution of the utility model, the silt discharge valve includes the following structure: a silt discharge port cover matching the silt discharge port, the silt discharge port cover having a plurality of silt discharge holes extending therethrough, a plurality of closing blocks matching the silt discharge holes, the top of the closing block abutting against the bottom of the silt discharge port cover, and a plurality of the closing blocks being provided with a driving shaft rod in common, and a driving motor being provided at the end of the driving shaft rod.

[0012] As a further technical solution of the utility model, a guide plate fixedly connected to the silt discharge port cover is provided on one side of the bottom of the silt discharge hole, and the guide plate extends obliquely downward.

[0013] The beneficial effects of the utility model are:

[0014] The utility model discharges bubbles vertically upward through the first aeration head and the bubbles discharged by the second aeration head are dispersed around and move upward, thereby increasing the coverage of the discharged bubbles and making oxygen dissolve in the sewage more efficiently. The opening of the second aeration hole in the second aeration head is inclined downward, and the bubbles will first move downward obliquely to contact the bottom of the aeration tank body after being discharged from the second aeration hole. During the movement of the bubbles, the water flow will be driven to contact the bottom of the aeration tank body. The bottom of the aeration tank body is stirred by the water flow to avoid the formation of precipitation, and the flocculants are prevented from being precipitated prematurely and suspended in the sewage, which is conducive to the full contact between the microorganisms and the sewage, and the efficiency of the microorganisms in degrading organic pollutants in the sewage is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of a biological carbon removal aeration tank used for sewage treatment.

[0016] Figure 2 The present invention is a schematic diagram of the structure of a first aeration head and a second aeration head of a biological carbon removal aeration tank for sewage treatment.

[0017] Figure 3 The present invention is a schematic diagram of the structure of a sludge discharge valve of a biological carbon removal aeration tank used for sewage treatment.

[0018] Figure 4 The present invention is a schematic structural diagram from another angle of a sludge discharge valve of a biological carbon removal aeration tank used for sewage treatment.

[0019] Among them: an aeration tank body 1, a water inlet pipe 11, a silt discharge port 12, a silt discharge pipe 13, an aeration mechanism 2, an aeration fan 21, a control valve 22, an aeration pipe 23, a first air pipe 231, a second air pipe 232, a first aeration head 24, a first aeration hole 241, a second aeration head 25, a second aeration hole 251, a silt discharge valve 3, a silt discharge port cover 31, a silt discharge hole 32, a closing block 33, a driving shaft 34, a driving motor 35, and a guide plate 36. DETAILED DESCRIPTION

[0020] The implementation methods of the present invention are described below in conjunction with the accompanying drawings and relevant embodiments. The implementation methods of the present invention are 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 , 2As shown, a biological decarbonation aeration tank for sewage treatment includes an aeration tank body 1 and an aeration mechanism 2. A water inlet pipe 11 is provided on one side of the top of the aeration tank body 1, a silt discharge port 12 is provided at the bottom of the aeration tank body 1, a silt discharge pipe 13 is provided at the bottom of the silt discharge port 12, and a silt discharge valve 3 is provided at the intersection of the silt discharge port 12 and the silt discharge pipe 13; the aeration mechanism 2 includes the following structures: an aeration fan 21, the aeration fan 21 is connected to a control valve 22 through a pipeline, the control valve 22 is provided with an aeration pipe 23 extending into the aeration tank body 1, a plurality of first aeration heads 24 and a plurality of second aeration heads 25 are provided on the aeration pipe 23, the first aeration head 24 is provided with a plurality of first aeration holes 241 opening upward, the second aeration head 25 is provided with a plurality of second aeration holes 251 opening downward, and the first aeration head 24 and the second aeration head 25 are both located on the inner side of the aeration tank body 1.

[0022] The utility model is used to increase the oxygen content in sewage, promote the reproduction and growth of microorganisms and degrade organic pollutants in sewage. The end of the water inlet pipe 11 away from the aeration tank body 1 is connected to the external biofilm reactor. The sewage enters the biofilm reactor after filtration, and then microorganisms for degrading organic pollutants are added to the sewage. The microorganisms are screened and reproduced in the sewage and then transported to the aeration tank body 1 through the water inlet pipe 11; the aeration fan 21 is connected to the external power supply line through a power supply cable for operation. When the aeration fan 21 is in operation, air with a certain pressure is generated and the air is transported to the aeration pipe 23 after passing through the control valve 22 along the pipeline. The same aeration fan 21 can be connected to a plurality of aeration tank bodies 1 through a plurality of aeration pipes 23, so that aeration operations can be performed on multiple aeration tank bodies 1 at the same time. Each aeration pipe 23 is provided with a control valve 22 at one end close to the aeration fan 21. The control valve 22 controls the air by closing and opening the internal valve core. Whether the air can enter the aeration pipe 23 is controlled to control whether the aeration tank body 1 is aerated. After the air is transported to the first aeration head 24 and the second aeration head 25 through the aeration pipe 23, it is discharged through the first aeration hole 241 and the second aeration hole 251 and forms a number of small bubbles in the sewage. The small bubbles gradually rise in the sewage and dissolve in the sewage, thereby increasing the oxygen content in the sewage and promoting the reproduction and growth of microorganisms. During the growth process, the microorganisms degrade the organic pollutants in the sewage into small molecules such as carbon dioxide and water. At the same time, some viscous substances such as polysaccharides and proteins are produced during the growth of microorganisms. These substances can combine with suspended pollution particles in the sewage to form flocs. A sludge pump and a sedimentation tank are provided at one end of the sludge discharge pipe 13 away from the aeration tank body 1. The flocs can be transported to the sedimentation tank along the sludge discharge pipe 13 through the sludge discharge port 12. The flocs will form high-carbon sludge through static sedimentation, completing the operation of degrading organic pollutants in the sewage.

[0023] The utility model is provided with a first aeration head 24 and a second aeration head 25. The first aeration head 24 and the second aeration head 25 are coaxial. The opening of the first aeration hole 241 in the first aeration head 24 faces upward, and the discharged bubbles move vertically upward while dissolving part of the oxygen in the sewage. The opening of the second aeration hole 251 in the second aeration head 25 faces downward, and the opening of the second aeration hole 251 is preferably inclined downward. After the bubbles are discharged from the second aeration hole 251, they will first move downward obliquely until they contact the bottom of the aeration tank body 1. During the movement of the bubbles, the water flow will be driven to contact the bottom of the aeration tank body 1. The bottom of the aeration tank body 1 is stirred by the water flow to avoid precipitation. After the bubbles contact the bottom of the aeration tank body 1, they will be dispersed around the second aeration head 25 and move upward. The bubbles discharged from the second aeration head 25 can cover a larger range, so that oxygen can be more efficiently dissolved in the sewage, thereby improving the aeration effect of the aeration mechanism 2.

[0024] It should be noted that a large number of microorganisms are adsorbed in the flocs formed after microbial degradation of organic pollutants, which prevents the flocs from settling prematurely and suspending in the sewage, is conducive to full contact between the microorganisms and the sewage, and improves the efficiency of microbial degradation of organic pollutants.

[0025] like Figure 1 , 2 As shown, as one of the preferred embodiments of the utility model, the aeration pipe 23 includes an adjacent first air pipe 231 and a second air pipe 232, and the control valve 22 is provided with a gas inlet and two gas outlets, the gas inlet is connected to the aeration fan 21, and the two gas outlets are respectively connected to the first air pipe 231 and the second air pipe 232.

[0026] The control valve 22 of the utility model preferably adopts a three-way valve. The control valve 22 controls the air generated by the aeration fan 21 to be transported to the first aeration head 24 through the first air pipe 231, or to the second aeration head 25 through the second air pipe 232 by changing the internal valve core. When the second aeration head 25 discharges bubbles through the second aeration hole 251, the flocs are difficult to settle at the bottom of the aeration tank body 1 and are in a suspended state. Microorganisms can efficiently reproduce and grow while degrading organic pollutants in the sewage. When there are bubbles in the sewage, the flocs are suspended. After there are more flocs, the first aeration head 24 can be switched to discharge bubbles through the first aeration holes 241. At this time, the bubbles can keep some smaller flocs suspended, while the larger flocs are gradually deposited at the bottom of the aeration tank body 1. Then, the flocs at the bottom of the aeration tank body 1 and most of the sewage are discharged into the sedimentation tank through the silt discharge port 12 and the silt discharge pipe 13, while a small amount of sewage with flocs is retained in the aeration tank body 1. These flocs can provide a large number of microorganisms for the sewage that needs to be treated later, which is conducive to the rapid reproduction of microorganisms, thereby improving the sewage treatment efficiency.

[0027] Furthermore, the control valve 22 preferably adopts a three-way valve whose two gas outlets are independently controlled by valve cores, that is, the two gas outlets can be opened or closed at the same time by independently controlled valve cores, or only any one gas outlet is opened, so that the control valve 22 can realize the operations of closing the aeration pipe 23, delivering air through the first air pipe 231 or the second air pipe 232 alone, and delivering air through the first air pipe 231 and the second air pipe 232 at the same time, so that the aeration tank can be suitable for more application scenarios.

[0028] like Figure 1 , 2 As shown, as one of the preferred embodiments of the utility model, the first air pipe 231 extends to the inner side of the aeration tank body 1 through a plurality of branches, and the first aeration head 24 is located on the branches of the first air pipe 231 .

[0029] The first air pipe 231 can increase the number of the first aeration heads 24 through a plurality of branches extending into the aeration tank body 1 , and can also make the first aeration heads 24 more evenly distributed in the aeration tank body 1 , thereby increasing the aeration effect of the aeration mechanism 2 .

[0030] like Figure 1 , 2 As shown, as one of the preferred embodiments of the utility model, the second air pipe 232 extends to the inner side of the aeration tank body 1 through a plurality of branches, the second aeration head 25 is located on the branches of the second air pipe 232, and the bottom of the second aeration head 25 is close to the inner bottom of the aeration tank body 1.

[0031] The second air pipe 232 can increase the number of second aeration heads 25 through a plurality of branches extending into the aeration tank body 1, and can also make the second aeration heads 25 more evenly distributed in the aeration tank body 1, thereby increasing the aeration effect of the aeration mechanism 2. At the same time, the water flow generated by the bubbles discharged from the second aeration heads 25 can stir the bottom of the aeration tank body 1 more evenly.

[0032] like Figure 1 As shown, as one of the preferred embodiments of the utility model, a plurality of silt discharge ports 12 are provided, and the plurality of silt discharge ports 12 are arranged into a plurality of silt discharge port groups according to the arranged positions, and the silt discharge port groups each include at least one silt discharge port 12, and the bottom of the silt discharge port groups are connected to the same silt discharge pipe 13.

[0033] A plurality of silt discharge ports 12 are provided at the bottom of the aeration tank body 1 so that the flocs and sewage at the bottom of the aeration tank body 1 can be discharged more evenly and efficiently, thereby preventing excessive flocs from being deposited at the corners and being difficult to discharge. By connecting the same silt discharge pipe 13 with the plurality of silt discharge ports 12 in the silt discharge port group, the number of silt discharge pipes 13 can be reduced, thereby reducing the manufacturing cost of the aeration tank.

[0034] like Figure 1 , 3As shown in Figure 4, as one of the preferred embodiments of the utility model, the silt discharge valve 3 includes the following structure: a silt discharge port cover 31 matching the silt discharge port 12, the silt discharge port cover 31 is penetrated by a plurality of silt discharge holes 32, a plurality of closing blocks 33 matching the silt discharge holes 32, the top of the closing block 33 abuts against the bottom of the silt discharge port cover 31, and the plurality of closing blocks 33 are jointly provided with a driving shaft rod 34, and a driving motor 35 is provided at the end of the driving shaft rod 34.

[0035] The silt discharge valve 3 of the utility model is fixed at the intersection of the silt discharge pipe 13 and the aeration tank body 1 through the silt discharge port cover 31. When the silt discharge valve 3 is in a closed state, the top of the closing block 33 completely covers the bottom of the silt discharge hole 32, and the silt discharge pipe 13 is connected to the aeration tank body 1. When it is necessary to discharge the sewage and flocculants in the aeration tank body 1, the driving motor 35 is operated to rotate the driving shaft 34 and drive the closing block 33 to rotate synchronously, so that the silt discharge hole 32 is opened, and the silt discharge valve 3 is in an open state. The sewage and flocculants can flow into the silt discharge pipe 13 through the silt discharge hole 32, thereby discharging the sewage and flocculants in the aeration tank body 1.

[0036] like Figure 1 , 3 As shown in FIG. 4 , as one of the preferred embodiments of the present utility model, a guide plate 36 fixedly connected to the silt discharge port cover 31 is provided on one side of the bottom of the silt discharge hole 32, and the guide plate 36 extends obliquely downward.

[0037] In the silt discharge port cover 31 of the utility model, the number of guide plates 36 and silt discharge holes 32 matches, and a plurality of guide plates 36 and silt discharge holes 32 are evenly distributed with the driving shaft 34 as the axis. The closing block 33 and the guide plate 36 extend downward at the same inclination angle. When the silt discharge valve 3 is in an open state, an inclined silt discharge channel connected to the silt discharge hole 32 is formed between the guide plate 36 and the closing block 33. The sewage and flocculants in the aeration tank body 1 are guided to flow into the silt discharge pipe 13 through the plurality of silt discharge channels, and a vortex can be formed at each silt discharge port 12. The vortex can generate a certain centripetal force on the fluid, so that the flocculants around the silt discharge port 12 quickly move toward the silt discharge port 12 and flow into the silt discharge pipe 13, and the flocculants at the bottom of the aeration tank body 1 are efficiently discharged.

[0038] 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 principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A biological carbon removal aeration tank for sewage treatment, comprising an aeration tank body (1) and an aeration mechanism (2), characterized in that: A water inlet pipe (11) is provided on one side of the top of the aeration tank body (1), a silt discharge port (12) is provided at the bottom of the aeration tank body (1), a silt discharge pipe (13) is provided at the bottom of the silt discharge port (12), and a silt discharge valve (3) is provided at the intersection of the silt discharge port (12) and the silt discharge pipe (13); The aeration mechanism (2) comprises the following structure: an aeration fan (21), the aeration fan (21) being connected to a control valve (22) via a pipeline, the control valve (22) being provided with an aeration pipe (23) extending into the aeration tank body (1), the aeration pipe (23) being provided with a plurality of first aeration heads (24) and a plurality of second aeration heads (25), the first aeration head (24) being provided with a plurality of first aeration holes (241) opening upward, the second aeration head (25) being provided with a plurality of second aeration holes (251) opening downward, and the first aeration head (24) and the second aeration head (25) being both located inside the aeration tank body (1).

2. The biological carbon removal aeration tank for sewage treatment according to claim 1, characterized in that: The aeration pipe (23) comprises a first air pipe (231) and a second air pipe (232) which are adjacent to each other. The control valve (22) is provided with a gas inlet and two gas outlets. The gas inlet is connected to the aeration fan (21). The two gas outlets are respectively connected to the first air pipe (231) and the second air pipe (232).

3. The biological carbon removal aeration tank for sewage treatment according to claim 2, characterized in that: The first air pipe (231) extends to the inside of the aeration tank body (1) through a plurality of branches, and the first aeration head (24) is located on the branches of the first air pipe (231).

4. The biological carbon removal aeration tank for sewage treatment according to claim 2, characterized in that: The second air pipe (232) extends to the inside of the aeration tank body (1) through a plurality of branches, the second aeration head (25) is located on the branches of the second air pipe (232), and the bottom of the second aeration head (25) is close to the bottom of the inside of the aeration tank body (1).

5. The biological carbon removal aeration tank for sewage treatment according to claim 1, characterized in that: A plurality of the silt discharge ports (12) are provided, and the plurality of the silt discharge ports (12) are arranged into a plurality of silt discharge port groups according to their arranged positions, each of the silt discharge port groups comprises at least one silt discharge port (12), and the bottoms of the silt discharge port groups are commonly connected to the same silt discharge pipe (13).

6. The biological carbon removal aeration tank for sewage treatment according to claim 1, characterized in that: The silt discharge valve (3) comprises the following structure: a silt discharge port cover (31) matched with the silt discharge port (12), the silt discharge port cover (31) having a plurality of silt discharge holes (32) passing through it, a plurality of closing blocks (33) matched with the silt discharge holes (32), the top of the closing block (33) abutting against the bottom of the silt discharge port cover (31), the plurality of closing blocks (33) being provided with a driving shaft (34) in common, and a driving motor (35) being provided at the end of the driving shaft (34).

7. The biological carbon removal aeration tank for sewage treatment according to claim 6, characterized in that: A guide plate (36) fixedly connected to the silt discharge port cover (31) is provided at one side of the bottom of the silt discharge hole (32), and the guide plate (36) extends obliquely downward.

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