A step sedimentation sewage sedimentation tank

Abstract

The utility model belongs to sewage treatment technical field, concretely relates to a sewage sedimentation tank of grading sedimentation, including sewage pool, the inner side of sewage pool is fixed with first baffle, second baffle and third baffle in proper order, the inner side of sewage pool is separated into dosing area, coagulation zone and sedimentation zone in proper order through first baffle, second baffle and third baffle, first baffle and second baffle are all fixed in sewage pool inner side bottom, and third baffle is fixed in sewage pool inner side upper portion. The flow collection hopper of dosing area gathers sewage to the narrow mouth, and the mixing is concentrated with the mixing fan blade, utilizes the narrow mouth space restriction to enhance the early stage mixing effect of sewage and medicament, solves the problem that the mixing of traditional dosing area is limited and uneven, and mud net pipe filters large particle silt to sludge pool, reduces the silt storage of dosing area and coagulation zone, reduces the cleaning frequency.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, specifically relating to a wastewater sedimentation tank with graded sedimentation. Background Technology

[0002] A staged sedimentation tank is a sedimentation and separation device used in wastewater treatment processes. It primarily separates and settles suspended solids, particulate matter, and silt from wastewater to achieve water purification. This device is commonly used in municipal wastewater treatment plants, industrial wastewater discharge treatment systems, and rainwater harvesting systems. Typically, wastewater enters the sedimentation tank through an inlet pipe and undergoes gradual sedimentation in multiple zoned areas. Larger particles settle first in the front zone, while smaller suspended solids settle gradually in the rear zone, thus achieving efficient staged treatment.

[0003] For example, in current inclined tube sedimentation tanks, wastewater is first stirred in a dosing tank, where large particles of silt settle. Then it passes through a coagulation tank where suspended solids and chemicals further coagulate. Finally, it enters the sedimentation tank, where inclined tubes cut the water flow, accelerating the settling of impurities to the bottom collection hopper. Finally, a sludge pump pumps the sludge to a sludge tank. Through multi-stage treatment, wastewater can be gradually cleaned, achieving a relatively good preliminary treatment effect. However, in current inclined tube sedimentation tanks, the dosing zone typically uses a stirring rod to directly mix the wastewater and chemicals within the entire dosing zone. The stirring rod's effective range is limited, resulting in a relatively poor mixing effect. Because the coagulation process is not ideal, the wastewater is usually circulated and coagulated in the coagulation zone through a coagulation drum to enhance the mixing effect of the chemicals and wastewater. This undoubtedly increases the pressure in the coagulation zone. When the wastewater flow rate is large, the coagulation zone may not achieve complete coagulation, and the wastewater will be flushed into the sedimentation zone for sedimentation. Some people solve this problem by increasing the dosage of chemicals, but this will undoubtedly increase the amount of chemicals used, and the large amount of chemical residues will also affect subsequent water treatment. In addition, large particles of silt are directly discharged into the chemical dosing zone with the wastewater, which can easily cause a lot of silt to settle and accumulate in the chemical dosing zone and the coagulation zone. This not only affects the water capacity but also requires frequent cleaning, which is quite troublesome. Utility Model Content

[0004] To address the above problems, the purpose of this utility model is to provide a graded sedimentation wastewater sedimentation tank. This solves the problem of current inclined tube sedimentation tanks where the dosing zone typically uses a stirring rod to directly mix the wastewater and chemicals. However, the stirring rod has a limited range of action, resulting in relatively poor mixing. Therefore, in the coagulation zone, circulating coagulation is usually performed through a coagulation cylinder to enhance the mixing effect of chemicals and wastewater. This undoubtedly increases the pressure in the coagulation zone. When the wastewater flow rate is large, the coagulation zone may not achieve complete coagulation, and the wastewater will be flushed into the sedimentation zone for settling. Some manufacturers address this by increasing the dosage of chemicals, but this undoubtedly increases the amount of chemicals used, and the residual chemicals can affect subsequent water treatment. Furthermore, large particles of silt are directly discharged into the dosing zone with the wastewater, easily causing excessive silt accumulation in both the dosing and coagulation zones. This not only affects the water capacity but also requires frequent cleaning, which is quite troublesome.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a staged sedimentation wastewater sedimentation tank, comprising a wastewater tank, wherein a first partition, a second partition, and a third partition are sequentially fixedly arranged on the inner side of the wastewater tank. The inner side of the wastewater tank is sequentially divided into a dosing zone, a coagulation zone, and a sedimentation zone by the first partition, the second partition, and the third partition. The first partition and the second partition are both fixed to the bottom of the inner side of the wastewater tank, and the third partition is fixed to the upper part of the inner side of the wastewater tank. A water flow channel from the coagulation zone to the sedimentation zone is formed between the second partition and the third partition. A flow-gathering hopper is fixedly installed on the upper inner side of the dosing zone. A long fixed plate is installed across the middle upper part of the sewage tank, spanning the dosing zone, coagulation zone, and sedimentation zone. A motor is fixedly installed on the upper side of the long fixed plate, corresponding to the three zones. The output end of the motor is fixedly connected to a shaft. A stirring fan blade is fixedly installed on the bottom inner side of the flow-gathering hopper within the dosing zone. A sludge flushing network pipe is fixedly installed on one side of the upper surface of the sewage tank, corresponding to the dosing zone. A sludge tank is fixedly installed on the side of the sewage tank away from the sedimentation zone. The output end of the sludge flushing network pipe is located on the upper side of the sludge tank.

[0006] The beneficial effects of this utility model are as follows: the wastewater in the dosing zone is collected by the converging hopper and then concentrated and stirred by the stirring fan blades. The narrow space limit enhances the initial mixing effect of wastewater and chemicals, solving the problems of limited stirring range and uneven mixing in traditional dosing zones. The sludge flushing mesh filters large particles of sludge into the sludge tank, reducing the accumulation of sludge in the dosing zone and coagulation zone, and reducing the cleaning frequency.

[0007] In order to prolong the flocculation time of wastewater in the coagulation zone;

[0008] As a further improvement to the above technical solution: a coagulation cylinder is fixedly installed in the coagulation zone, and turbine blades are fixedly installed at equal intervals through the shaft inside the coagulation cylinder, with the turbine blades facing downwards.

[0009] The beneficial effects of this improvement are: the turbine fan blades in the coagulation cylinder of the coagulation zone push the flow downward, prolonging the flocculation time of the sewage in the coagulation zone and enhancing the mixing effect of residual agents and sewage.

[0010] To accelerate the sedimentation of flocs;

[0011] As a further improvement to the above technical solution: a partition plate is fixedly installed in the middle of the inner side of the sedimentation zone, and inclined plates are fixedly installed at equal intervals between the two sides of the partition plate and the inner wall of the sedimentation zone. A clear water inlet is connected to the side of the sewage tank away from the sludge tank, which is higher than the inclined plate. A sludge collection hopper is fixedly installed at the bottom of the sedimentation zone. A sludge pump is installed on one side of the sludge tank. The input end of the sludge pump is connected to the bottom of the sludge collection hopper, and the output end of the sludge pump is connected to the upper side of the sludge tank.

[0012] The beneficial effects of this improvement are as follows: the inclined plates on both sides of the sedimentation zone divider cut the water flow into a thin flow layer, which accelerates the sedimentation of flocs by utilizing the principle of shallow flow; the sludge collection hopper collects the settled sludge; and the sludge pump discharges the sludge to the sludge tank, thereby achieving centralized sludge treatment.

[0013] To prevent sludge from hardening and sticking to the bucket wall, causing blockage;

[0014] As a further improvement to the above technical solution: a scraper rod is fixedly installed inside the sedimentation zone, which passes through the partition plate to the inside of the sludge collection hopper, and the scraper rod contacts the inner wall of the sludge collection hopper.

[0015] The beneficial effects of this improvement are: the shaft in the sedimentation zone drives the scraper to rotate in contact with the inner wall of the sludge collection hopper, which can promptly scrape off the attached sludge, prevent the sludge from sticking and hardening on the hopper wall and causing blockage, and ensure the efficient suction and discharge of the sludge pump.

[0016] In order to return the wastewater to the coagulation zone for recycling;

[0017] As a further improvement to the above technical solution: a filter screen bucket is fixedly installed on the upper side of the inner side of the sludge tank away from the sludge pump, and a sewage pump is fixedly installed on the side of the sewage tank away from the sludge pump corresponding to the dosing area. The output end of the sewage pump extends through the inner side of the sludge tank and communicates with the inner side of the filter screen bucket. The output end of the sewage pump is also connected to the coagulation zone.

[0018] The beneficial effects of this improvement are: the filter screen of the sludge tank filters the upper layer of sewage, and the sewage pump returns the filtered sewage to the coagulation zone for recycling.

[0019] To facilitate regular cleaning of the accumulated mud at the bottom;

[0020] As a further improvement to the above technical solution: a sludge cleaning port is provided on the side of the sludge tank away from the sewage tank, corresponding to the bottom. The outer side of the sludge cleaning port is bolted and sealed with a cover. A flushing port is provided on the side of the sewage tank corresponding to the bottom of the dosing area and the coagulation area.

[0021] The beneficial effects of this improvement are: the sludge removal port of the sludge tank facilitates regular cleaning of the bottom sludge, and the bottom flushing port of the chemical dosing area and coagulation area of ​​the sewage tank can flush away a small amount of accumulated sludge and sand.

[0022] In summary, the beneficial effects of this technical solution are as follows: the dosing zone's flow-gathering hopper, combined with the stirring fan blades, utilizes the narrow opening space to enhance the initial mixing effect of the chemicals and wastewater; the sludge flushing mesh filters large particles of sludge to the sludge tank, reducing sludge accumulation; the turbine fan blades inside the coagulation cylinder in the coagulation zone form a circulating water flow, extending the flocculation time, alleviating the problem of incomplete coagulation caused by high flow rates, and reducing chemical input; the inclined plate in the sedimentation zone cuts the water flow to accelerate the sedimentation of flocculants; the sludge collection hopper and sludge pump achieve centralized sludge treatment; the sludge scraper prevents sludge from adhering and clogging the hopper wall; the sludge tank filter screen hopper and wastewater pump return the upper filtered wastewater to the coagulation zone for recycling; and the sludge cleaning port and flushing port facilitate regular cleaning of accumulated sludge.

[0023] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description

[0024] Figure 1 This is a cross-sectional view of the inner structure of this utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0026] Figure 3 This is a schematic diagram of the structure of the present invention. Figure 2 ;

[0027] In the diagram: 1. Sewage tank; 2. First baffle; 3. Second baffle; 4. Third baffle; 5. Sludge collection hopper; 6. Converging hopper; 7. Long fixed plate; 8. Motor; 9. Agitator blade; 10. Coagulation cylinder; 11. Turbine blade; 12. Sludge scraper; 13. Sludge pump; 14. Inclined plate; 15. Sludge tank; 16. Sludge flushing pipe; 17. Filter screen hopper; 18. Sewage pump; 19. Divider plate. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way.

[0029] like Figure 1 — Figure 3As shown: A staged sedimentation wastewater sedimentation tank includes a wastewater tank 1. A first baffle 2, a second baffle 3, and a third baffle 4 are sequentially fixed to the inner side of the wastewater tank 1. The inner side of the wastewater tank 1 is divided into a dosing zone, a coagulation zone, and a sedimentation zone by the first baffle 2, the second baffle 3, and the third baffle 4. The first baffle 2 and the second baffle 3 are both fixed to the bottom of the inner side of the wastewater tank 1, and the third baffle 4 is fixed to the upper part of the inner side of the wastewater tank 1. A water flow channel from the coagulation zone to the sedimentation zone is formed between the second baffle 3 and the third baffle 4. A flow-collecting hopper 6 is fixed to the upper inner side of the dosing zone. A long fixed plate 7 is arranged across the dosing zone, the coagulation zone, and the sedimentation zone in the middle upper part of the wastewater tank 1. The upper side of the long fixed plate 7... Motors 8 are fixedly installed in the three sections mentioned above. Each motor 8 has a fixed shaft connected to its output end. Within the dosing zone, the shaft extends to the inner bottom of the collecting hopper 6, where a stirring blade 9 is fixedly installed. A sludge flushing pipe 16 is fixedly installed on one side of the upper surface of the wastewater tank 1, corresponding to the dosing zone. A sludge tank 15 is fixedly installed on the side of the wastewater tank 1 away from the sedimentation zone. The output end of the sludge flushing pipe 16 is located above the sludge tank 15. The collecting hopper 6 in the dosing zone collects wastewater into a narrow opening, where it is concentrated and stirred by the stirring blades 9. The narrow opening space enhances the initial mixing effect of the wastewater and chemicals, solving the problems of limited mixing range and uneven mixing in traditional dosing zones. The sludge flushing pipe 16 filters large particles of sludge into the sludge tank 15, reducing the need for coagulation in the dosing zone. To reduce silt accumulation and cleaning frequency, a coagulation cylinder 10 is fixedly installed in the coagulation zone. Turbine blades 11 are equidistantly fixed inside the coagulation cylinder 10, with the shaft extending through it. The turbine blades 11 push downwards, extending the flocculation time of wastewater in the coagulation zone and enhancing the mixing effect of residual chemicals with wastewater. A partition plate 19 is fixedly installed in the middle of the inner side of the sedimentation zone. Inclined plates 14 are equidistantly fixed between the two sides of the partition plate 19 and the inner wall of the sedimentation zone. A clear water inlet is connected to the side of the wastewater tank 1 away from the sludge tank 15, which is higher than the inclined plate 14. A sludge collection hopper 5 is fixedly installed at the bottom of the sedimentation zone. A sludge pump 13 is installed, with its input end connected to the bottom of the sludge collection hopper 5 and its output end connected to the upper side of the sludge tank 15. Inclined plates 14 on both sides of the sedimentation zone partition plate 19 cut the water flow into a thin layer, accelerating the sedimentation of flocculants using the shallow flow principle. The sludge collection hopper 5 collects the settled sludge, and the sludge pump 13 discharges the sludge to the sludge tank 15, achieving centralized sludge treatment. A scraper rod 12 is fixedly installed inside the sludge collection hopper 5 via a shaft passing through the partition plate 19. The scraper rod 12 contacts the inner wall of the sludge collection hopper 5. The shaft in the sedimentation zone drives the scraper rod 12 to rotate in contact with the inner wall of the sludge collection hopper 5, which can promptly scrape off the attached sludge, preventing the sludge from hardening and sticking to the hopper wall, thus ensuring efficient suction and discharge by the sludge pump 13.A filter screen hopper 17 is fixedly installed on the upper side of the inner side of the sludge tank 15, away from the sludge pump 13. A sewage pump 18 is fixedly installed on the side of the sewage tank 1 away from the sludge pump 13, corresponding to the dosing area. The output end of the sewage pump 18 extends through the inner side of the sludge tank 15 and communicates with the inner side of the filter screen hopper 17. The output end of the sewage pump 18 is also connected to the coagulation area. The filter screen hopper 17 of the sludge tank 15 filters the upper layer of sewage, and the sewage pump 18 returns the filtered sewage to the coagulation area for recycling. A sludge cleaning port is provided at the bottom of the side of the sludge tank 15 away from the sewage tank 1, and a cover is bolted and sealed to the outside of the sludge cleaning port. Flushing ports are provided on the sides of the sewage tank 1, corresponding to the dosing area and the bottom of the coagulation area. The sludge cleaning port of the sludge tank 15 facilitates regular cleaning of the bottom sludge, and the flushing ports at the bottom of the dosing area and the coagulation area of ​​the sewage tank 1 can flush away a small amount of accumulated sludge.

[0030] Working principle and usage process of this utility model:

[0031] In use, the sewage inlet pipe can be erected using iron frames, directly connecting to the top of the sludge flushing network pipe 16. Sewage enters the sludge flushing network pipe 16, which can be configured with a relatively coarse mesh to filter out large particles of sludge. A large amount of sewage and fine impurities can fall directly into the dosing area through the sludge flushing network pipe 16. The filtered large particles of sludge will fall into the sludge tank 15 due to inertia and their own fluidity. When the sewage enters the dosing area, it flows into the collecting hopper 6, gradually converging from the top of the collecting hopper 6 towards the narrow opening at the bottom. Chemicals are added directly above the collecting hopper 6 via a dosing machine. As the chemicals pass through the narrow opening along with the sewage, they are concentratedly agitated by the stirring blades 9. The narrow opening has a small space, and the sewage flow must pass through it, greatly enhancing the initial mixing effect of the sewage and chemicals. The sewage in the dosing area gradually deepens, eventually overflowing the first baffle 2 and entering the coagulation zone. The sewage in the coagulation zone has already mixed with the chemicals, resulting in significant flocculation. The sewage overflows the first baffle 2... After passing through the second baffle 3, the wastewater enters the sedimentation zone. Simultaneously, the wastewater in the coagulation zone, under the suction and discharge action of the turbine blades 11, circulates from the top of the coagulation cylinder 10 and exits from the bottom, increasing the flocculation time and further enhancing the mixing effect between the wastewater and residual chemicals. After entering the sedimentation zone, the wastewater flows upwards, being cut into a thin flow layer by the inclined plate 14. Utilizing the shallow flow principle, this accelerates the sedimentation of flocculants. The sludge settles into the inner side of the collection hopper 5, and the sludge pump 13 suctions and discharges the sludge from the collection hopper 5. The sludge accumulates in the sludge tank 15. The clean water passes through the inclined plate 14 and is then discharged from the upper clean water outlet. The sludge scraper 12 inside the sludge collection hopper 5 rotates under the drive of the upper motor 8, scraping the sludge on the inner wall of the sludge collection hopper 5. The sludge accumulates and settles in the sludge tank 15. In addition to the sludge, there is also some sewage. As the sludge increases, the sewage passes through the filter screen hopper 17. The filter screen hopper 17 can filter out obvious mud and sand. The sewage pump 18 is started. The sewage pump 18 can return the upper layer of sewage in the sludge tank 15 to the coagulation zone for recycling treatment.

[0032] In addition, it should be noted that the sludge inside the sludge tank 15 can be periodically pumped out using a suction pump. The sludge cleaning port on the side of the sludge tank 15 can be opened to remove the accumulated sludge and sand at the bottom that is not easy to be pumped out. The flushing port on the side of the sewage tank 1 can be blocked with a plug during sewage treatment. During regular maintenance, the flushing port can be opened to flush out a small amount of unflocculated fine sludge and sand in the dosing area and coagulation area.

[0033] It should be further explained that in conventional wastewater treatment, the flocs produced during chemical flocculation will have a certain amount of dissolved air. With the help of aeration devices, the dissolved air effect of the flocs is increased, thereby causing the flocs to float. However, the products of chemical flocculation will not necessarily float and generally require aeration assistance. In addition, by adding different flocculants, the dissolved air effect of the floc products can be inhibited, thereby controlling whether they float or settle. In this technical solution, the method of allowing the flocs to settle is used for wastewater discharge.

[0034] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, there are objectively infinite specific structures. For those skilled in the art, several improvements, modifications, or changes can be made without departing from the principles of the present invention, and the above technical features can also be combined in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A wastewater sedimentation tank for staged sedimentation, characterized in that: The system includes a sewage tank (1). A first partition (2), a second partition (3), and a third partition (4) are sequentially fixed to the inner side of the sewage tank (1). The inner side of the sewage tank (1) is sequentially divided into a dosing zone, a coagulation zone, and a sedimentation zone by the first partition (2), the second partition (3), and the third partition (4). The first partition (2) and the second partition (3) are both fixed to the bottom of the inner side of the sewage tank (1), and the third partition (4) is fixed to the upper part of the inner side of the sewage tank (1). A water flow channel from the coagulation zone to the sedimentation zone is formed between the second partition (3) and the third partition (4). A flow-gathering hopper is fixedly installed on the upper inner side of the dosing zone. (6) A long fixed plate (7) is provided across the middle of the upper side of the sewage tank (1) spanning the dosing zone, coagulation zone and sedimentation zone. A motor (8) is fixedly provided on the upper side of the long fixed plate (7) corresponding to the above three zones. A shaft is fixedly connected to the output end of the motor (8). A stirring fan (9) is fixedly provided on the inner bottom side of the flow hopper (6) within the dosing zone. A sludge flushing pipe (16) is fixedly provided on one side of the upper side of the sewage tank (1) corresponding to the dosing zone. A sludge tank (15) is fixedly provided on the side of the sewage tank (1) away from the sedimentation zone. The output end of the sludge flushing pipe (16) is located on the upper side of the sludge tank (15).

2. The wastewater sedimentation tank for graded sedimentation according to claim 1, characterized in that: A concrete cylinder (10) is fixedly installed in the concrete zone. Turbine fan blades (11) are fixedly installed at equal intervals inside the concrete cylinder (10) through the shaft in the concrete zone. The thrust direction of the turbine fan blades (11) is downward.

3. The wastewater sedimentation tank for graded sedimentation according to claim 1, characterized in that: A partition plate (19) is fixedly installed in the middle of the inner side of the sedimentation zone. Inclined plates (14) are fixedly installed at equal intervals between the two sides of the partition plate (19) and the inner wall of the sedimentation zone. A clear water inlet is connected to the side of the sewage tank (1) away from the sludge tank (15) above the inclined plate (14). A sludge collection hopper (5) is fixedly installed at the bottom of the sedimentation zone. A sludge pump (13) is installed on one side of the sludge tank (15). The input end of the sludge pump (13) is connected to the bottom of the sludge collection hopper (5). The output end of the sludge pump (13) is connected to the upper side of the sludge tank (15).

4. A wastewater sedimentation tank for graded sedimentation according to claim 1, characterized in that: Within the sedimentation zone, the shaft passes through the partition plate (19) to the inner side of the sludge collection hopper (5) and is fixedly provided with a sludge scraper (12), which contacts the inner wall of the sludge collection hopper (5).

5. A wastewater sedimentation tank for graded sedimentation according to claim 1, characterized in that: A filter screen bucket (17) is fixedly installed on the upper side of the inner side of the sludge tank (15) away from the sludge pump (13). A sewage pump (18) is fixedly installed on the side of the sewage tank (1) away from the sludge pump (13) corresponding to the dosing area. The output end of the sewage pump (18) extends through the inner side of the sludge tank (15) and communicates with the inner side of the filter screen bucket (17). The output end of the sewage pump (18) is connected to the coagulation area.

6. A wastewater sedimentation tank for graded sedimentation according to claim 1, characterized in that: The sludge tank (15) has a sludge cleaning port on the side away from the sewage tank (1) at the bottom. The outer side of the sludge cleaning port is bolted and sealed with a cover. The side of the sewage tank (1) has a flushing port on the bottom side corresponding to the dosing area and the coagulation area.

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