Integrated efficient sedimentation tank for enhancing flocculation process

Abstract

The utility model provides an integrated efficient sedimentation tank for strengthening a flocculation process, which comprises a coagulation tank, a flocculation tank, a plug flow area and a sedimentation tank which are sequentially communicated, and a first stirring component is arranged in the flocculation tank; the first stirring assembly comprises a first spiral blade, a first transmission shaft, a first hub and a first axial flow blade, the first spiral blade is arranged on the upper portion of the first transmission shaft, the first hub is connected with the bottom end of the first transmission shaft, the first axial flow blade is arranged on the first hub, and the first hub and the first axial flow blade are located in the guide cylinder. According to the integrated high-efficiency sedimentation tank for strengthening the flocculation process, provided by the utility model, small flocs in the flocculation tank collide with and are fused into one another along with fluid, the flocculation time is prolonged, alumen ustum is continuously increased, and rapid sedimentation in the sedimentation tank is facilitated.

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 with enhanced flocculation technology. Background Art

[0002] The integrated high-efficiency sedimentation tank is a sewage treatment process that integrates the coagulation unit, flocculation unit, sedimentation unit, sludge return unit, dosing unit and automatic control system to achieve rapid sedimentation. The coagulation tank of the integrated high-efficiency sedimentation tank requires the reagents to be mixed quickly and evenly. However, in the existing coagulation tanks, the reagents often flow into the flocculation tank with the process before they can be diluted, resulting in uneven coagulation process and uneven size and distribution of alum flowers in the mixed liquid. The flocculation tank requires a long flocculation time so that the alum flowers can fully grow, but the alum flowers often enter the plug flow area before they have time to grow, thus affecting the subsequent sedimentation process and preventing the process from running 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 with enhanced flocculation process, so that small flocs in the flocculation tank can collide and merge with each other with the fluid, increase the flocculation time, make the alum flocs continue to grow, which is conducive to rapid sedimentation in the sedimentation tank 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 for enhancing the flocculation process, comprising a coagulation tank, a flocculation tank, a plug flow area and a sedimentation tank connected in sequence, and a first stirring component is provided in the flocculation tank; the first stirring component comprises a first spiral blade, a first transmission shaft, a first hub and a first axial flow blade, the first spiral blade is arranged on the upper part of the first transmission shaft, the first hub is connected to the bottom end of the first transmission shaft, the first axial flow blade is arranged on the first hub, and the first hub and the first axial flow blade are located in the guide tube.

[0005] As a further improvement of the embodiment of the utility model, the upper end of the first spiral blade is located 0 to 200 mm above the upper end surface of the guide tube.

[0006] As a further improvement of the embodiment of the utility model, the first transmission shaft is coaxially arranged with the guide cylinder.

[0007] As a further improvement of the embodiment of the utility model, a second stirring component is provided in the coagulation tank.

[0008] As a further improvement of an embodiment of the utility model, the second stirring assembly includes a second spiral blade, a second transmission shaft, a second hub, a second axial flow blade and a centrifugal blade, the second spiral blade is arranged on the upper part of the second transmission shaft, the second hub is connected to the bottom end of the second transmission shaft, and the second axial flow blade is arranged on the second hub; the centrifugal blade is arranged on the upper end surface of the second axial flow blade.

[0009] As a further improvement of the embodiment of the utility model, the upper end of the second spiral blade is located 100 mm below the liquid level.

[0010] As a further improvement of an embodiment of the utility model, the second transmission shaft is coaxially arranged with the coagulation tank.

[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 lower part of the guide tube.

[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: the utility model embodiment provides an integrated high-efficiency sedimentation tank for strengthening the flocculation process. On the one hand, by setting a first stirring component including a first spiral blade in the flocculation tank, the upward-moving flocs collide and merge with the downward fluid, thereby increasing the flocculation time and making the alum flowers grow continuously, which is conducive to rapid precipitation in the sedimentation tank and effectively improving the effluent water quality. On the other hand, by setting a second stirring component including a centrifugal blade and a second spiral blade in the coagulation tank, radial fluid and upward axial fluid are generated at the bottom of the tank, and downward-moving fluid is generated below the liquid surface. Multiple fluids interact and mix, so that the reagents are quickly and fully mixed and evenly mixed, and the coagulation effect is good. By neutralizing the negative charge on the surface of the particles, the particles are "destabilized", forming small flocs and then entering the flocculation zone, creating conditions for the subsequent formation of larger flocs. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0016] Figure 2 It is a structural schematic diagram of the second stirring component in the integrated high-efficiency sedimentation tank of an embodiment of the utility model.

[0017] The figure includes: a first spiral blade 111 , a first transmission shaft 112 , a first hub 113 , a first axial flow blade 114 , a second spiral blade 211 , a second transmission shaft 212 , a second hub 213 , a second axial flow blade 214 , and a centrifugal blade 215 . DETAILED DESCRIPTION

[0018] The technical solution of the utility model is described in detail below in conjunction with the accompanying drawings.

[0019] The embodiment of the utility model provides an integrated high-efficiency sedimentation tank for strengthening the flocculation process, including a coagulation tank, a flocculation tank, a plug flow area and a sedimentation tank connected in sequence. A guide tube with openings at both ends is provided in the flocculation tank. The coagulation tank and the flocculation tank are connected through 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 lower part of the guide tube in the flocculation tank. The bottom of the plug flow area is connected to the bottom of the flocculation tank, and the top of the plug flow area is connected to the top of the sedimentation tank. A water inlet and a coagulant dosing port are provided on the wall of the coagulation tank, and a coagulant aid dosing port is provided on the wall of the flocculation tank. A supernatant outlet is provided on the upper part of the wall of the sedimentation tank, and a sludge outlet is provided at the bottom of the sedimentation tank.

[0020] In this embodiment, a first stirring component is provided in the flocculation tank, such as Figure 1 As shown, the first stirring assembly includes a first spiral blade 111, a first transmission shaft 112, a first hub 113 and a first axial flow blade 114. The top end of the first transmission shaft 112 is connected to the first driving member arranged at the top of the flocculation tank, the first hub 113 is arranged at the bottom end of the first transmission shaft 112, and 2 to 3 first axial flow blades 114 are evenly arranged around the first hub 113. Preferably, the first transmission shaft 112 is coaxially arranged with the guide tube. The first spiral blade 111 is arranged on the upper part of the first transmission shaft 112, and the first spiral blade 111 and the first transmission shaft 112 are coaxially arranged. Preferably, the upper end of the first spiral blade 111 is located 0 to 200 mm above the upper end surface of the guide tube.

[0021] When the first driving member drives the first stirring assembly to rotate, the first axial flow blade 114 generates a first fluid moving upward in the guide tube, and the fluid is continuously mixed with the coagulant to dissolve the agent in the water. The first fluid is the main fluid in the flocculation tank. The first spiral blade 111 generates a second fluid moving from top to bottom around the upper part of the first transmission shaft 112. The second fluid moving downward and the first fluid moving upward are mixed and integrated with each other near the upper end surface of the guide tube, reducing the flow velocity of the mixed liquid, increasing the flocculation time, and continuously increasing the alum flowers, further enhancing the mixing effect of the agent.

[0022] As a preferred example, a second stirring component is provided in the coagulation tank, such as Figure 2As shown, the second stirring assembly includes a second spiral blade 211, a second transmission shaft 212, a second hub 213, a second axial flow blade 214 and a centrifugal blade 215. The top of the second transmission shaft 212 is connected to the second driving member arranged at the top of the coagulation tank, the second hub 213 is arranged at the bottom of the second transmission shaft 212, and 2 to 3 second axial flow blades 214 are evenly arranged around the second hub 213. Preferably, the second transmission shaft 212 is coaxially arranged with the coagulation tank. The second spiral blade 211 is arranged at the upper part of the second transmission shaft 212, and the second spiral blade 211 and the second transmission shaft 212 are coaxially arranged. Preferably, the upper end of the second spiral blade 211 is located 100 mm below the liquid surface, that is, the second spiral blade 211 is completely immersed in the water body. The centrifugal blade 215 is arranged on the upper end surface of the second axial flow blade 214, and is located at the edge of the second axial flow blade away from the second hub 213. The number of centrifugal blades 215 is equal to that of the second axial flow blades 214, and they are arranged one by one.

[0023] When the second driving member drives the second stirring assembly to rotate, the second axial flow blade 214 generates a first fluid moving upward, which is continuously mixed with the coagulant to dissolve the agent in the water. The first fluid is the main fluid in the coagulation tank. The centrifugal blade 215 generates a second fluid moving tangentially. The second fluid is mixed with the coagulant to form a mixed liquid that flies out tangentially. After being reflected by the tank wall, the mixed liquid is mixed with the first fluid moving upward, so that the agent is quickly dissolved in the water. The second spiral blade 211 generates a third fluid moving from top to bottom around the upper part of the second transmission shaft 212. The third fluid moving downward and the first fluid moving upward, as well as the mixed fluid of the second fluid and the first fluid, are mixed and integrated with each other in the height direction, further enhancing the mixing effect of the agent.

[0024] The integrated high-efficiency sedimentation tank with enhanced flocculation process of the above-mentioned embodiment, in the coagulation tank, three streams of fluid are mixed and integrated with each other through the second stirring component, so that the reagent is fully mixed and diluted in the coagulation tank, overcoming the limitation of the coagulant in the prior art that there is no time to fully dilute, and creating conditions for the subsequent formation of larger flocs. In the flocculation tank, the first stirring component is used to make two streams of fluid with opposite movement directions near the upper end surface of the guide tube mix and integrate with each other, reduce the flow rate of the mixed liquid, increase the flocculation time, make the alum flocs continue to grow, further enhance the mixing effect of the reagent, and create conditions for rapid precipitation.

[0025] Preferably, the sedimentation tank includes a connected pre-sedimentation area and a sedimentation area, and the sedimentation area is provided with a water collection tank, an inclined pipe and a sludge scraper from top to bottom. After the sewage is subjected to crowded sedimentation, sludge filtration and sedimentation in the sedimentation area, it rises to the inclined pipe. The inclined pipe uses the shallow pool principle to reduce the path of suspended particles in the water to settle, shorten the sedimentation time, and the clear water after sedimentation is discharged from the supernatant outlet through the water collection tank.

[0026] Preferably, the integrated high-efficiency sedimentation tank of the enhanced flocculation process of this embodiment further includes a sludge recovery unit, which includes a sludge return pipe, the inlet of the sludge return pipe is connected to the sludge outlet of the sedimentation tank, and the outlet of the sludge return pipe is connected to the sludge inlet at the bottom of the coagulation tank. A residual sludge pipe is also provided at the sludge outlet of the sedimentation tank. A part of the sludge in the bottom pit of the sedimentation tank enters the coagulation tank through the sludge return pipe, 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.

[0027] The working process of the integrated high-efficiency sedimentation tank of the above preferred embodiment is as follows:

[0028] The sewage flows into the coagulation tank through the water inlet and the coagulant flows into the coagulation tank through the coagulant dosing port, and the first driving member and the second driving member are started.

[0029] The second driving member drives the second stirring assembly to rotate, and the second axial flow blade 214 generates a first fluid moving upward, which is continuously mixed with the coagulant to dissolve the agent in the water. The first fluid is the main fluid in the coagulation tank. The centrifugal blade 215 generates a second fluid moving tangentially. The second fluid is mixed with the coagulant to form a mixed liquid that flies out tangentially. After being reflected by the tank wall, the mixed liquid is mixed with the first fluid moving upward, so that the agent is quickly dissolved in the water. The second spiral blade 211 generates a third fluid moving from top to bottom around the upper part of the second transmission shaft. The third fluid moving downward and the first fluid moving upward, as well as the mixed fluid of the second fluid and the first fluid, are mixed and integrated with each other in the height direction, further enhancing the mixing effect of the agent.

[0030] After mixing and dilution in the coagulation tank, the small flocs enter the flocculation tank and are slowly mixed with the coagulant flowing in through the coagulant dosing port to form larger alum flowers. The first driving member drives the first stirring assembly to rotate, and the first axial flow blade 114 generates a first fluid moving upward in the guide tube. The fluid is continuously mixed with the coagulant, so that the agent is continuously dissolved in the water. The first fluid is the main fluid in the flocculation tank. The first spiral blade 111 generates a second fluid moving from top to bottom around the upper part of the first transmission shaft. The second fluid moving downward and the first fluid moving upward mix and merge with each other near the upper end surface of the guide tube, which reduces the flow velocity of the mixed liquid, increases the flocculation time, and continuously increases the alum flowers, further enhancing the mixing effect of the agent.

[0031] The mixed liquid flows into the pre-sedimentation area through the plug flow area, the size of the alum flocs increases, the sedimentation speed is faster, and most of the coagulated flocs with higher density settle in the pre-sedimentation area. In the sedimentation area, the sludge is settled at the bottom of the sedimentation tank through the combined action of the scraper, inclined pipe and water collection tank. Part of the sludge enters the coagulation tank through the sludge return pipe, and the other part of the sludge is discharged from the integrated high-efficiency sedimentation tank through the residual sludge pipe. The clear water after precipitation is collected by the water collection tank and flows out from the supernatant outlet.

[0032] 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 with enhanced flocculation process, characterized in that: The invention comprises a coagulation tank, a flocculation tank, a plug flow zone and a sedimentation tank which are connected in sequence. A first stirring component is arranged in the flocculation tank. The first stirring component comprises a first spiral blade (111), a first transmission shaft (112), a first hub (113) and a first axial flow blade (114). The first spiral blade (111) is arranged on the upper part of the first transmission shaft (112). The first hub (113) is connected to the bottom end of the first transmission shaft (112). The first axial flow blade (114) is arranged on the first hub (113). The first hub and the first axial flow blade are located in a guide tube.

2. The integrated high-efficiency sedimentation tank for enhancing flocculation process according to claim 1 is characterized in that: The upper end of the first spiral blade (111) is located 0 to 200 mm above the upper end surface of the guide tube.

3. The integrated high-efficiency sedimentation tank for enhancing flocculation process according to claim 1 is characterized in that: The first transmission shaft (112) is coaxially arranged with the guide cylinder.

4. The integrated high-efficiency sedimentation tank for enhancing flocculation process according to claim 1 is characterized in that: A second stirring component is arranged in the coagulation tank.

5. The integrated high-efficiency sedimentation tank for enhancing flocculation process according to claim 4 is characterized in that: The second stirring component comprises a second spiral blade (211), a second transmission shaft (212), a second wheel hub (213), a second axial flow blade (214) and a centrifugal blade (215); the second spiral blade (211) is arranged on the upper part of the second transmission shaft (212); the second wheel hub (213) is connected to the bottom end of the second transmission shaft (212); the second axial flow blade (214) is arranged on the second wheel hub (213); and the centrifugal blade (215) is arranged on the upper end surface of the second axial flow blade (214).

6. The integrated high-efficiency sedimentation tank for enhancing flocculation process according to claim 5, characterized in that: The upper end of the second spiral blade (211) is located 100 mm below the liquid surface.

7. The integrated high-efficiency sedimentation tank for enhancing flocculation process according to claim 5, characterized in that: The second transmission shaft (212) is coaxially arranged with the coagulation tank.

8. The integrated high-efficiency sedimentation tank for enhancing flocculation process according to claim 1, characterized in that: The coagulation tank and the flocculation tank are connected through 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 lower part of the guide tube.

9. The integrated high-efficiency sedimentation tank for enhancing flocculation process according to claim 1, characterized in that: The sedimentation tank comprises a pre-sedimentation area and a sedimentation area which are connected to each other. A water collecting tank, an inclined pipe and a mud scraper are arranged in sequence from top to bottom in the sedimentation area.

10. The integrated high-efficiency sedimentation tank for enhancing flocculation process according to claim 1, characterized in that: A sludge outlet is provided at the bottom of the sedimentation tank, the sludge outlet is communicated with the inlet of the sludge return pipe, and the outlet of the sludge return pipe is communicated with the sludge inlet at the bottom of the coagulation tank.

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