An integrated high-efficiency sedimentation tank

Abstract

The utility model provides an integrated high-efficiency sedimentation tank, including a coagulation tank, a flocculation tank, a plug flow area and a sedimentation tank connected in sequence, wherein a mixer is provided at the bottom of the coagulation tank; the mixer includes a base, a submersible motor, a mixing disc and a dosing pipe arranged in sequence from bottom to top; the mixing disc includes a body, an impeller cavity with a top opening is provided at the center of the body, and a plurality of flow channels are evenly provided in the body along the circumference of the impeller cavity, and the flow channels are connected to the impeller cavity; an impeller is provided in the impeller cavity, and the output shaft of the motor is connected to the impeller; the outlet end of the dosing pipe extends into the impeller cavity from the top opening; a water inlet is provided at the upper part of the wall of the coagulation tank, a dosing port is provided at the lower part of the wall, and the inlet end of the dosing pipe is connected to the dosing port. The utility model provides an integrated high-efficiency sedimentation tank, which realizes full mixing of the reagent and sewage in the coagulation tank, has a good coagulation effect, creates conditions for the subsequent formation of larger flocs and rapid precipitation, and effectively improves the effluent water quality.

Description

Technical Field

[0001] The utility model belongs to the technical field of environmental protection, and specifically relates to an integrated high-efficiency sedimentation tank. Background Art

[0002] The integrated high-efficiency sedimentation tank is a sewage treatment process that integrates the coagulation system, flocculation system, sedimentation system, sludge return system, dosing system and automatic control system to achieve rapid sedimentation. However, in the coagulation tank of the existing integrated high-efficiency sedimentation tank, the coagulant is added at a single point, and the agent often flows into the next process before it has time to be diluted, resulting in uneven coagulation process, uneven size and distribution of alum flowers in the mixed liquid, which affects the subsequent sedimentation process and cannot make the process run efficiently. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide an integrated high-efficiency sedimentation tank, so as to achieve full mixing of the reagent and sewage in the coagulation tank, achieve good coagulation effect, create conditions for the subsequent formation of larger flocs and rapid precipitation, and effectively improve the effluent water quality.

[0004] In order to solve the above technical problems, an embodiment of the utility model provides an integrated high-efficiency sedimentation tank, comprising a coagulation tank, a flocculation tank, a plug flow area and a sedimentation tank connected in sequence, wherein a mixer is provided at the bottom of the coagulation tank; the mixer comprises a base, a submersible motor, a mixing disk and a dosing pipe arranged in sequence from bottom to top; the mixing disk comprises a main body, a top-opening impeller cavity is provided at the center of the main body, a plurality of flow channels are evenly provided in the main body along the circumference of the impeller cavity, and the flow channels are connected with the impeller cavity; an impeller is provided in the impeller cavity, and the output shaft of the motor is connected to the impeller; the outlet end of the dosing pipe is located above the impeller; a water inlet is provided on the upper part of the wall of the coagulation tank, a dosing port is provided on the lower part of the wall, and the inlet end of the dosing pipe is connected with the dosing port.

[0005] As a further improvement of the embodiment of the utility model, the diameter of the top opening of the impeller cavity is larger than the diameter of the outlet end of the dosing tube.

[0006] As a further improvement of the embodiment of the utility model, the agitator is coaxially arranged with the coagulation tank.

[0007] As a further improvement of the embodiment of the utility model, the distance between the end face of the outlet end of the dosing pipe and the upper end face of the impeller is 20 to 100 mm.

[0008] As a further improvement of the embodiment of the utility model, the diameter of the outlet end of the dosing pipe is smaller than the diameter of the impeller.

[0009] As a further improvement of the embodiment of the utility model, the flow channel is arranged to be inclined downward from the inside to the outside.

[0010] As a further improvement of the embodiment of the utility model, the angle between the axis of the flow channel and the horizontal plane is 1 to 10°.

[0011] As a further improvement of the embodiment of the utility model, the coagulation tank and the flocculation tank are connected by a connecting pipe, the inlet end of the connecting pipe is connected to the bottom of the coagulation tank, and the outlet end of the connecting pipe is connected to the guide tube at the lower part of the flocculation tank.

[0012] As a further improvement of the embodiment of the utility model, the sedimentation tank includes a pre-sedimentation area and a sedimentation area which are connected, and a water collecting trough, an inclined pipe and a mud scraper are arranged in sequence from top to bottom in the sedimentation area.

[0013] As a further improvement of the embodiment of the utility model, a sludge outlet is provided at the bottom of the sedimentation tank, the sludge outlet is connected to the inlet of the sludge return pipe, and the outlet of the sludge return pipe is connected to the sludge inlet at the bottom of the coagulation tank.

[0014] Compared with the prior art, the technical solution of the utility model has the following beneficial effects: an integrated high-efficiency sedimentation tank provided by the embodiment of the utility model, by arranging a stirrer at the bottom of the coagulation tank, the agent flows to the top of the impeller through the dosing pipe, and is premixed with the surrounding water to form a premixed liquid, and the high-speed rotating impeller generates a tangential fluid that is sprayed to the surroundings through the flow channel, and at the same time, the premixed liquid above the impeller flows downward into the impeller cavity, and under the action of the impeller, the premixed liquid is mixed again, so that the agent and sewage are continuously mixed, and the coagulation effect is good, and the particles are "destabilized" by neutralizing the negative charge on the surface of the particles, forming small flocs and then entering the flocculation zone, creating conditions for the subsequent formation of larger flocs and rapid precipitation, and effectively improving the effluent water quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of an integrated high-efficiency sedimentation tank of an embodiment of the utility model;

[0016] Figure 2 yes Figure 1 The structural diagram of the mixer;

[0017] Figure 3 yes Figure 2 A schematic diagram of the structure of the middle mixing disk;

[0018] Figure 4 yes Figure 1 Schematic diagram of the mixing effect in the coagulation tank.

[0019] In the figure, there are: coagulation tank 1, flocculation tank 2, plug flow area 3, sedimentation tank 4, pre-sedimentation area 41, scraper 42, sump 43, sedimentation area 44, inclined pipe 45, supernatant outlet 5, residual sludge pipe 6, sludge return pipe 7, connecting pipe 8, mixer 9, base 91, submersible motor 92, mixing disk 93, main body 931, flow channel 932, impeller chamber 933, impeller 94, dosing pipe 95, dosing port 10, and water inlet 11. DETAILED DESCRIPTION

[0020] The technical solution of the utility model is described in detail below in conjunction with the accompanying drawings.

[0021] The utility model embodiment provides an integrated high-efficiency sedimentation tank, such as Figure 1 As shown, it includes a coagulation tank 1, a flocculation tank 2, a plug flow area 3 and a sedimentation tank 4 which are connected in sequence. The coagulation tank 1 is connected to the flocculation tank 2 through a connecting pipe 8, the inlet end of the connecting pipe 8 is connected to the bottom of the coagulation tank 1, and the outlet end of the connecting pipe 8 is connected to the guide tube at the lower part of the flocculation tank 2. The bottom of the plug flow area 3 is connected to the bottom of the flocculation tank 2, and the top of the plug flow area 3 is connected to the top of the sedimentation tank 4. A water inlet 11 is provided on the upper part of the wall of the coagulation tank 1, and a dosing port 10 is provided on the lower part of the wall. A supernatant outlet 5 is provided on the upper part of the wall of the sedimentation tank 4, and a sludge outlet is provided at the bottom of the sedimentation tank.

[0022] In this embodiment, a stirrer 9 is provided at the bottom of the coagulation tank 1, and the stirrer 9 is coaxially arranged with the coagulation tank 1. Figure 2 As shown, the mixer 9 includes a base 91, a submersible motor 92, a mixing plate 93 and a dosing pipe 95 which are arranged in sequence from bottom to top. Figure 3 As shown, the mixing disk 93 includes a body 931, a cylindrical impeller cavity 933 with an opening at the top is provided in the center of the body 931, and a plurality of flow channels 932 are evenly provided in the body 931 along the circumference of the impeller cavity 933, and the flow channels 932 are connected to the impeller cavity 933. The flow channels 932 are arranged tangentially, and the number of flow channels is 6 to 12. An impeller 94 is provided in the impeller cavity 933, and the output shaft of the motor 92 is connected to the impeller 94. The impeller 94 is centrifugal and produces radial fluid flowing at high speed to all sides. The outlet end of the dosing tube 95 is located above the impeller 94, and the inlet end of the dosing tube 95 is connected to the dosing port 10. Preferably, the distance between the outlet end face of the dosing tube and the upper end face of the impeller 94 is 20 to 100 mm. Preferably, the top opening diameter of the impeller cavity 933 is larger than the diameter of the outlet end of the dosing tube 95. The diameter of the outlet end of the dosing tube 95 is smaller than the diameter of the impeller 94.

[0023] In the integrated high-efficiency sedimentation tank of the above embodiment, in the coagulation tank 1, the reagent flows into the dosing pipe 95 through the dosing port 10, and then flows downward from the outlet end of the dosing pipe to be premixed with the surrounding water to form a premixed liquid. The high-speed rotating impeller generates a tangential fluid to spray in all directions. At the same time, the premixed liquid above the impeller flows downward into the impeller cavity of the mixing disk. The high-speed rotating impeller mixes the premixed liquid again, so that the reagent is continuously mixed and diluted. The reagent mixture is sprayed at high speed from each flow channel, mixed and diluted with the surrounding water from multiple directions around the mixing disk, so that the reagent is fully mixed and diluted in the coagulation tank, overcoming the limitation of the single-point dilution of the prior art, and creating conditions for the efficient operation of subsequent processes.

[0024] Preferably, the flow channel 932 is arranged to be inclined downward from the inside to the outside. Further preferably, the angle between the axis of the flow channel 932 and the horizontal plane is 1 to 10 degrees.

[0025] In the above embodiment, Figure 4 As shown in the figure, the medicine-water mixture produced by the high-speed rotation of the impeller is sprayed outward and downward from the surrounding flow channels, impacting the bottom of the pool and mixing with the mixed liquid at the bottom of the pool, without causing precipitation of the medicine. The mixed liquid is reflected by the bottom of the pool and then moves outward and upward, and a medicine mixed liquid moving from bottom to top is produced near the pool wall of the coagulation tank. During the movement of the medicine mixed liquid, it is constantly mixed with the water above and around it, and the medicine is constantly mixed and diluted. When the continuously diluted mixed liquid moves to the vicinity of the liquid surface, due to the combined effect of gravity and the high-speed rotating impeller, a mixed liquid moving from top to bottom is produced near the center of the coagulation tank. When the mixed liquid moves to the mixing disk, it is constantly mixed with new medicines, and then diluted and mixed under the action of the high-speed rotating impeller to carry out the next mixing and dilution cycle.

[0026] Preferably, Figure 1 As shown, the sedimentation tank 4 includes a pre-sedimentation area 41 and a sedimentation area 44 which are connected. The sedimentation area 44 is provided with a water collection tank 43, an inclined pipe 45 and a sludge scraper 42 from top to bottom. After the sewage is subjected to crowded sedimentation, sludge filtration and sedimentation in the sedimentation area 44, it rises to the inclined pipe 45. The inclined pipe uses the shallow pool principle to reduce the sedimentation path of suspended particles in the water and shorten the sedimentation time. The clear water after sedimentation is discharged from the supernatant outlet 5 through the water collection tank 43.

[0027] Preferably, the integrated high-efficiency sedimentation tank of this embodiment further includes a sludge recovery unit, which includes a sludge return pipe 7, the inlet of the sludge return pipe 7 is connected to the sludge outlet of the sedimentation tank, and the outlet of the sludge return pipe 7 is connected to the sludge inlet at the bottom of the coagulation tank 1. A residual sludge pipe 6 is also provided at the sludge outlet of the sedimentation tank. A part of the sludge in the bottom pit of the sedimentation tank 4 enters the coagulation tank 1 through the sludge return pipe 7, so that the coagulant in the sludge is recycled and the operating cost is reduced, and the other part of the sludge is discharged from the integrated high-efficiency sedimentation tank through the residual sludge pipe 6.

[0028] The working process of the integrated high-efficiency sedimentation tank of the above preferred embodiment is as follows:

[0029] The sewage flows into the coagulation tank 1 from the upper part of the coagulation tank 1 through the water inlet 11 , and the reagent flows into the dosing pipe 95 through the dosing port 10 .

[0030] Start the mixer 9, and the high-speed rotating impeller 94 generates radial fluid that is ejected from the flow channel 932 of the mixing disk. The medicine and water above the impeller are pre-mixed and then flow into the impeller chamber 933. The high-speed rotating impeller mixes the pre-mixed liquid again, so that the medicine is fully diluted and then ejected outward and downward from the flow channels on the mixing disk.

[0031] The sprayed reagent mixture impacts the bottom of the pool and is continuously mixed and diluted. After being reflected by the bottom of the pool, the mixture moves outward and upward, and produces a reagent mixture moving from bottom to top near the wall of the coagulation pool. During the movement of the reagent mixture, it is constantly mixed with the water above and around it, and the reagent is continuously mixed and diluted. When the continuously diluted mixture moves to the vicinity of the liquid surface, due to the combined effect of gravity and the high-speed rotating impeller, a mixture moving from top to bottom is produced near the center of the coagulation pool. The mixture moves to the mixing disk, is continuously mixed with new reagents, and is then mixed by the high-speed rotating impeller for the next mixing and dilution cycle.

[0032] After mixing and dilution, the small flocs in the coagulation tank 1 enter the flocculation tank 2, where they are slowly mixed with the coagulant to form larger alum flocs. The mixed liquid flows into the pre-sedimentation zone 41 through the plug flow zone 3, where the alum flocs increase in size and the sedimentation rate is relatively high. Most of the coagulation flocs with relatively high density settle in the pre-sedimentation zone. In the sedimentation zone 44, the sludge is precipitated at the bottom of the sedimentation tank by the combined action of the scraper 42, the inclined pipe 45, and the water collection tank 43. Part of the sludge enters the coagulation tank 1 through the sludge return pipe 7, and the other part of the sludge is discharged from the integrated high-efficiency sedimentation tank through the residual sludge pipe 6. The clean water after precipitation is collected by the water collection tank 43 and flows out from the supernatant outlet 5.

[0033] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above specific embodiments. The above specific embodiments and the description in the specification are only for further illustrating the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the claims and their equivalents.

Claims

1. An integrated high-efficiency sedimentation tank, characterized in that: The invention comprises a coagulation tank (1), a flocculation tank (2), a plug flow area (3) and a sedimentation tank (4) which are connected in sequence. A stirrer (9) is provided at the bottom of the coagulation tank (1). The stirrer (9) comprises a base (91), a submersible motor (92), a mixing plate (93) and a dosing pipe (95) which are arranged in sequence from bottom to top. The mixing plate (93) comprises a body (931). An impeller cavity (933) with an opening at the top is provided at the center of the body (931). A plurality of flow channels (932) are evenly arranged along the circumference of the impeller chamber (933) in the coagulation tank (1), and the flow channels (932) are connected to the impeller chamber (933); an impeller (94) is arranged in the impeller chamber (933), and the output shaft of the motor (92) is connected to the impeller (94); the outlet end of the dosing pipe (95) is located above the impeller (94); a water inlet is arranged at the upper part of the wall of the coagulation tank (1), and a dosing port is arranged at the lower part of the wall of the coagulation tank (1), and the inlet end of the dosing pipe (95) is connected to the dosing port.

2. The integrated high-efficiency sedimentation tank according to claim 1, characterized in that: The diameter of the top opening of the impeller chamber (933) is larger than the diameter of the outlet end of the dosing tube (95).

3. The integrated high-efficiency sedimentation tank according to claim 1 is characterized in that: The stirrer (9) is coaxially arranged with the coagulation tank (1).

4. The integrated high-efficiency sedimentation tank according to claim 1, characterized in that: The distance between the outlet end surface of the dosing pipe (95) and the upper end surface of the impeller (94) is 20 to 100 mm.

5. The integrated high-efficiency sedimentation tank according to claim 1 is characterized in that: The diameter of the outlet end of the dosing pipe (95) is smaller than the diameter of the impeller (94).

6. The integrated high-efficiency sedimentation tank according to claim 1, characterized in that: The flow channel (932) is arranged to be inclined downward from the inside to the outside.

7. The integrated high-efficiency sedimentation tank according to claim 6, characterized in that: The angle between the axis of the flow channel (932) and the horizontal plane is 1 to 10 degrees.

8. The integrated high-efficiency sedimentation tank according to claim 1, characterized in that: The coagulation tank (1) and the flocculation tank (2) are connected via a connecting pipe (8), the inlet end of the connecting pipe (8) is connected to the bottom of the coagulation tank (1), and the outlet end of the connecting pipe (8) is connected to a guide tube at the lower part of the flocculation tank (2).

9. The integrated high-efficiency sedimentation tank according to claim 1, characterized in that: The sedimentation tank (4) comprises a pre-sedimentation area (41) and a sedimentation area (44) which are connected to each other. The sedimentation area (44) is provided with a water collecting tank (43), an inclined pipe (45) and a mud scraper (42) in sequence from top to bottom.

10. The integrated high-efficiency sedimentation tank according to claim 1, characterized in that: A sludge outlet is provided at the bottom of the sedimentation tank (4), the sludge outlet is connected to the inlet of the sludge return pipe (7), and the outlet of the sludge return pipe (7) is connected to the sludge inlet at the bottom of the coagulation tank (1).

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