Primary sedimentation tank capable of reducing dosage

Abstract

The utility model discloses a primary sedimentation tank capable of reducing dosage, which relates to the field of sewage treatment, aims to solve the problem of high operating cost in the prior art, and adopts the technical scheme that sludge buckets are divided into two groups, one group of sludge buckets is used for pre-sedimentation, a water distribution device is arranged at the bottom of each group of sludge buckets, and the other group of sludge buckets are used for water distribution; part of non-dosing sewage is directly fed into a sludge hopper through a water distribution device, in the process that the sewage flows upwards through a sludge layer accumulated in the sludge hopper, the sludge layer conducts first-order filtration on pollutants in the non-dosing sewage, most of the pollutants are removed, and after reaching an upper clear water layer, the remaining pollutants make contact with remaining chemicals in the clear water layer, so that the sewage is discharged out of the clear water layer. Therefore, the generated sludge is used for replacing a flocculating agent and a coagulant aid, the dosage is reduced, and the operation cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a primary sedimentation tank capable of reducing the amount of added chemicals. Background Art

[0002] At present, it is generally believed that the efficient operation mode of sewage treatment stations in meat slaughtering and cooked food processing enterprises is: by strengthening the treatment effect of the physical pretreatment stage, improving the removal rate of pollutants in sewage, reducing the total pollution load in sewage, reducing the load of subsequent biological treatment units, reducing sludge production, and reducing subsequent solid waste treatment costs.

[0003] The most commonly used facility in the physical pretreatment stage is the primary sedimentation tank. By increasing a small amount of investment and adding appropriate chemicals, pollutants in suspended or colloidal state in the sewage station can be flocculated and coagulated, thereby improving the sedimentation and separation effect. It can significantly improve the effluent quality of the primary sedimentation tank, reduce the SS content in the sewage, and remove BOD5 and TP at the same time. However, the continuous addition of chemicals in the existing structure will generate stable cost expenditures, and there is an urgent need to further reduce operating costs through structural improvements. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the existing defects and provide a primary sedimentation tank capable of reducing the amount of added medicine, which can effectively solve the problems in the background technology.

[0005] In order to achieve the above-mentioned purpose, the utility model discloses a primary sedimentation tank capable of reducing the amount of dosing. The technical solution adopted is as follows: it includes a primary sedimentation tank body, a dosing area is provided in the primary sedimentation tank body, and pollutants in the sewage can be flocculated and precipitated by adding drugs in the dosing area. A plurality of sludge hoppers are arranged in the primary sedimentation tank body, the dosing area is connected to a water distribution area, and the water distribution area is connected to the sludge hopper, and the sewage with flocculated sedimentation is sent into the sludge hopper for sedimentation through the water distribution area. The dosing area is connected to a first water inlet device, and the sludge hopper is connected to a second water inlet device. The second water inlet device is located in the sludge hopper near the dosing area and the water distribution area, and pollutants in the sewage are adsorbed by the generated sludge precipitation to reduce the amount of dosing. There is a water outlet in the sludge hopper away from the dosing area and the water distribution area, and the water outlet is connected to a water collection channel. A submersible sewage pump is arranged under each sludge hopper, and the purified water after precipitation is discharged through the water collection channel, and the sludge generated by precipitation is discharged by the submersible sewage pump.

[0006] As a preferred technical solution of the present invention, the dosing area includes a PAC dosing area and a PAM dosing area. The PAC dosing area is located in front of the PAM dosing area and the two are connected. The PAC dosing area is also connected to the first water inlet device. Adding chemicals in the PAC dosing area produces precipitation, while adding a coagulant aid in the PAM dosing area causes the flocculated particles to grow.

[0007] As a preferred technical solution of the present invention, the PAC dosing area and the PAM dosing area are separated by a partition wall, and a first connecting hole is provided below the partition wall.

[0008] As a preferred technical solution of the present invention, a stirring device is provided in both the PAC dosing area and the PAM dosing area.

[0009] As a preferred technical solution of the present invention, the PAC dosing area and the PAM dosing area are located in the water distribution area, and a second communication hole communicating with the water distribution area is opened on the side wall of the PAM dosing area.

[0010] As a preferred technical solution of the present invention, a water distribution hole is provided on the bottom surface of the water distribution area, and the water distribution hole is opposite to the upper opening of the sludge hopper.

[0011] As an optimal technical solution of the present invention, the second water inlet device also includes a water distribution device, which is close to the sludge outlet below the sludge hopper. The sewage entering the sludge hopper can pass upward through the sludge layer, and after sufficient contact and adsorption with the sludge, the sewage merges with the sewage above.

[0012] Compared with the existing technology, the present invention has the following advantages: by first passing part of the sewage through a sludge hopper to generate sludge, and then using the generated sludge to purify the remaining sewage, the generated sludge can be used to replace flocculants and coagulants, reducing the dosage of the drugs and lowering operating costs. The stirring mechanism in the dosing area can fully mix the sewage and the drugs, improving the flocculation efficiency of the drugs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of the utility model;

[0014] Figure 2 This is a schematic diagram of the internal structure of the utility model;

[0015] Figure 3 This is a schematic diagram of the AA cross-sectional structure of the utility model;

[0016] Figure 4 This is a schematic diagram of the BB cross-sectional structure of the present utility model.

[0017] In the figure: 1. Primary sedimentation tank body; 2. Sludge hopper; 3. Water distribution area; 4. PAC dosing area; 5. PAM dosing area; 6. Mixing device; 7. Water distribution device; 8. Collection channel. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example

[0019] like Figures 1 to 4 As shown, the utility model discloses a primary sedimentation tank capable of reducing the amount of dosing. The technical solution adopted is as follows: it includes a primary sedimentation tank body 1, two sludge hoppers 2 are arranged in the primary sedimentation tank body 1, namely a left hopper and a right hopper, a water distribution area 3, a PAC dosing area 4 and a PAM dosing area 5 are arranged on the inner wall of the primary sedimentation tank body 1, the PAC dosing area 4 and the PAM dosing area 5 are both located in the water distribution area 3, the PAC dosing area 4 is used to add flocculants to cause pollutants in a suspended or colloidal state to flocculate and coagulate, and the PAM dosing area 5 is used to add coagulants to increase the sediment for easy separation. In order to make the pollutants in the sewage fully contact with the flocculants and coagulants, stirring devices 6 are provided in the PAC dosing area 4 and the PAM dosing area 5, and the stirring device 6 adopts a structure in which a motor drives a mechanical stirring paddle, as shown in FIG. Figure 3 As shown, the PAC dosing area 4 and the PAM dosing area 5 are located in the water distribution area 3. The PAC dosing area 4 and the PAM dosing area 5 are open at the top and connected at the bottom through a first connecting hole to form a communicating vessel structure. A second connecting hole is opened on the side wall of the PAM dosing area 5. The sewage and sediment in the PAM dosing area 5 can enter the water distribution area 3 through the second connecting hole. The bottom surface of the water distribution area 3 is provided with a water distribution hole, as shown in FIG. Figure 4 As shown, the water distribution holes of the water distribution area 3 are located above the side wall of the left bucket. The sewage and sediment discharged from the water distribution holes enter the left bucket along the side wall of the left bucket and settle in the left bucket. The sediment accumulates in the lower layer, and the clean water gathers in the upper layer. As the thickness of the sediment increases, the sedimentation layer itself can serve as an adsorption layer. Therefore, the sewage inlet device is divided into a first water inlet device and a second water inlet device. The first water inlet device is connected to the PAC dosing area 4 for dosing to form flocculation and precipitation. The second water inlet device is connected to the water replenishment device 7. The water replenishment device 7 is lowered into the left bucket to near the bottom of the bucket so that the sedimentation layer can be accumulated as thickly as possible in the water replenishment device 7. The undoped sewage entering the left bucket through the water replenishment device 7 passes through the sedimentation layer and upwards to merge with the clean water above. In the process of sewage passing through the sedimentation layer, most of the suspended matter or colloidal pollutants will be captured and adsorbed by the sedimentation layer. After a small amount of pollutants pass through the sedimentation layer, they come into contact with the remaining chemicals in the water above to form flocculation and precipitation.

[0020] Due to the stirring of the water entering from below the left bucket, the sedimentation effect in the left bucket will be difficult to achieve the expected effect. Therefore, a right bucket is also set on the right side of the left bucket. After the sewage above the left bucket exceeds the upper limit of the side walls of the left and right buckets, the sewage in the left bucket will enter the right bucket and continue to settle in the right bucket. At this time, since there is no other interference in the right bucket except the water entering from above, a more effective sedimentation and separation can be formed in the right bucket. In order to draw out the clean water formed above the right bucket, a water collection channel 8 is installed on the inner wall of the primary sedimentation tank body 1 above the right bucket, and the water collection channel 8 is connected to the outside.

[0021] In order to send out the sludge formed below the sludge hopper 2, the bottom surfaces of the left hopper and the right hopper are connected to submersible sewage pumps.

[0022] The working principle of this utility model:

[0023] The sewage enters the PAC dosing area 4 and enters the PAM dosing area 5 through the first connecting hole. Flocculant is added to the PAC dosing area 4 and coagulant aid is added to the PAM dosing area 5. The stirring device 6 is started to stir the sewage in the PAC dosing area 4 and the PAM dosing area 5 so that the sewage is fully in contact with the flocculant and coagulant aid, generating flocs in the PAC dosing area 4 and gradually growing in the PAM dosing area 5. As liquid continues to flow into the PAC dosing area 4, the liquid level in the PAM dosing area 5 gradually rises. When the liquid level reaches the second connecting hole, the sewage and flocs enter the water distribution area 3 through the second connecting hole, and then enter the left bucket of the sludge hopper 2 through the water distribution hole, and settle in the left bucket with the flocculent sediment at the bottom and the clean water at the top. After running for a set time, the sedimentation layer in the left bucket accumulates to a certain thickness. At this time, the sewage is divided into two paths with 70% flow and 30% flow through the three-way component. The sewage with 70% flow enters the PAC dosing area 4. The dosage of PAC dosing area 4 and PAM dosing area 5 is reduced to 70% of the previous amount according to the change of flow, but the concentration of the liquid medicine remains the same as before. The other 30% flow of sewage enters the left bucket through the water replenishment device 7. The sewage flows upward through the sedimentation layer. The floating objects or gel-like pollutants contained in the sewage will be absorbed by the sedimentation layer in large quantities. The remaining small amount of pollutants follow the water flow to the upper water layer, and then come into contact with the remaining chemicals in the water to be converted into flocculation precipitation and further removed.

[0024] As the liquid level in the left bucket gradually rises, water and flocculated sediment enter the right bucket for further sedimentation. As the liquid level continues to rise, the clear water above the right bucket enters the collection channel 8 and is discharged from the primary sedimentation tank.

[0025] When the sludge in the sludge hopper 2 reaches a certain thickness, the excess sludge is discharged into the primary sedimentation tank through a submersible sewage pump.

[0026] The circuits and mechanical connections involved in the present invention are conventional means used by those skilled in the art, and technical inspiration can be obtained through a limited number of experiments, and they belong to common knowledge.

[0027] Components not described in detail herein are prior art.

[0028] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A primary sedimentation tank capable of reducing the amount of dosing, comprising a primary sedimentation tank body (1), wherein a dosing area is provided in the primary sedimentation tank body (1), characterized in that: The primary sedimentation tank body (1) includes a plurality of sludge hoppers (2), the dosing area is connected to a water distribution area (3), the water distribution area (3) is connected to the sludge hopper (2), the dosing area is connected to a first water inlet device, the sludge hopper (2) is connected to a second water inlet device, the second water inlet device is located in the sludge hopper (2) close to the dosing area and the water distribution area (3), the sludge hopper (2) away from the dosing area and the water distribution area (3) has a water outlet, the water outlet is connected to a water collection channel (8), and a submersible sewage pump is provided below each sludge hopper (2).

2. The primary sedimentation tank capable of reducing the dosage of chemicals according to claim 1, characterized in that: The dosing area comprises a PAC dosing area (4) and a PAM dosing area (5), the PAC dosing area (4) is located at the front end of the PAM dosing area (5) and the two are connected, and the PAC dosing area (4) is connected to the first water inlet device.

3. The primary sedimentation tank capable of reducing the dosage of chemicals according to claim 2, characterized in that: The PAC dosing area (4) and the PAM dosing area (5) are separated by a partition wall, and a first connecting hole is provided below the partition wall.

4. The primary sedimentation tank capable of reducing the dosage of chemicals according to claim 2 or 3, characterized in that: A stirring device (6) is provided in both the PAC dosing area (4) and the PAM dosing area (5).

5. The primary sedimentation tank capable of reducing the dosage of chemicals according to claim 2 or 3, characterized in that: The PAC dosing area (4) and the PAM dosing area (5) are located in the water distribution area (3), and a second communication hole communicating with the water distribution area (3) is opened on the side wall of the PAM dosing area (5).

6. The primary sedimentation tank capable of reducing the dosage of chemicals according to claim 4, characterized in that: The bottom surface of the water distribution area (3) is provided with a water distribution hole, and the water distribution hole is opposite to the upper opening of the sludge hopper (2).

7. The primary sedimentation tank capable of reducing the dosage of chemicals according to claim 1, characterized in that: The second water inlet device further comprises a water distribution device (7), and the water distribution device (7) is close to the sludge outlet below the sludge hopper (2).

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