CN214327396U - Sedimentation tank - Google Patents
Sedimentation tank Download PDFInfo
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- CN214327396U CN214327396U CN202023345616.2U CN202023345616U CN214327396U CN 214327396 U CN214327396 U CN 214327396U CN 202023345616 U CN202023345616 U CN 202023345616U CN 214327396 U CN214327396 U CN 214327396U
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Abstract
The utility model relates to the field of wastewater treatment, and discloses a sedimentation tank, which comprises a water distribution channel, a pipeline mixer, a soda reaction tank, a flocculation reaction tank and a sludge discharge tank which are connected in sequence; the water outlet end of the water distribution channel is conical, and a lime feeding pipe is arranged above the water inlet end of the water distribution channel; a baffle is arranged below the water outlet end of the water distribution channel; an aeration pipe is arranged in the water distribution channel; the water outlet end of the water distribution channel is connected with the water inlet end of the pipeline mixer, and the water inlet end of the pipeline mixer is provided with a coagulant feeding port. The utility model provides a sedimentation tank, effluent turbidity and effluent hardness are less, and effluent stable in quality of water.
Description
Technical Field
The utility model relates to a waste water treatment technical field, concretely relates to sedimentation tank.
Background
The sedimentation tank is a novel sedimentation process integrating coagulation, flocculation, reaction, sedimentation, clarification and sludge concentration technologies, and mainly comprises a water distribution channel, a coagulation reaction tank, a lime reaction tank, a soda reaction tank, a flocculation reaction tank and a sedimentation tank. The waste water enters a coagulation reaction tank from the bottom of the water distribution channel, and in the coagulation reaction tank, a coagulant of ferric trichloride is mixed with the waste water, so that the coagulant is hydrolyzed, and the stability of colloidal particles is damaged. And then enters a lime reaction tank through an overflow weir, and in the lime reaction tank, lime reacts with carbonate in water, so that the temporary hardness of the water is reduced. The wastewater after reaction enters a soda reaction tank from the bottom, and sodium carbonate reacts with magnesium chloride, calcium chloride, magnesium sulfate and the like in water in the soda reaction tank, so that the permanent hardness of the water is reduced. Then the particles enter a flocculation reaction tank through a flow guide pipe, and colloid particles are mutually collided and condensed by adding a flocculating agent to form large particles, so that the sedimentation is facilitated. And finally, the sewage enters a sedimentation tank, large particles in water are deposited at the bottom of the sedimentation tank under the action of gravity sedimentation, and the settled sludge is discharged outside the system under the action of slow stirring of a sludge scraper, so that the aim of sewage treatment is fulfilled.
The sedimentation tank has the advantages of high treatment efficiency, large water yield per unit area, small occupied area and low civil engineering investment, but when the sedimentation tank is used for treating low-turbidity wastewater in the coal chemical industry, the lower the turbidity in the water is, the weaker the collision among particles is, the more adverse to the capture of a coagulant is, so the coagulation effect of the coagulation reaction tank is poor; and the low-turbidity wastewater is easy to scale on the wall of the coagulation reaction tank, so that the effective volume of the coagulation reaction tank is reduced, the hydraulic retention time (the hydraulic retention time is equal to the ratio of the volume of the coagulation reaction tank to the mass flow of inlet water) is shortened, the reaction time is insufficient, and suspended matter floc is too small, so that the sedimentation effect is poor. In order to improve the removal efficiency and ensure that the hardness and the turbidity of the final effluent of the sedimentation tank reach the standard, a large amount of lime needs to be added into a lime reaction tank. However, in the existing sedimentation tank, the lime feeding point is below the water surface, the lime feeding condition cannot be effectively observed, and the feeding point is close to the stirring machine, so that the stirring machine is easily overloaded and stops due to scaling.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problem and providing a sedimentation tank, the sedimentation tank has the advantages of mixing effectually, get rid of efficiently.
In order to achieve the purpose, the utility model provides a sedimentation tank, wherein the sedimentation tank comprises a water distribution channel, a pipeline mixer, a soda reaction tank, a flocculation reaction tank and a sludge discharge tank which are connected in sequence;
the water outlet end of the water distribution channel is conical, and a lime feeding pipe is arranged above the water inlet end of the water distribution channel; a baffle plate is arranged below the water outlet end of the water distribution channel; an aeration pipe is arranged in the water distribution channel;
the water outlet end of the water distribution channel is connected with the water inlet end of the pipeline mixer, and the water inlet end of the pipeline mixer is provided with a coagulant feeding port.
Preferably, a plurality of feed inlets are arranged on the lime feeding pipe.
Preferably, the lime water feeding pipes are distributed above the water distribution channel in a linear, U-shaped or annular shape.
Preferably, the lime water feeding pipes are distributed in a U shape or an annular shape above the water distribution channel.
Preferably, the aerator pipe is a liftable aerator pipe, a positioning block is arranged at the lower end of the aerator pipe, and the positioning block is used for adjusting the depth of the aerator pipe in the water distribution channel.
Preferably, the aeration pipe is arranged at one side of the water distribution channel, and a plurality of aeration hole valves are arranged on the aeration pipe.
Preferably, the pipeline mixer is a static pipeline mixer, a baffle plate is arranged in the static pipeline mixer every 5-8cm along the direction of water flow, and the inclination angle alpha of the baffle plate is 50-60 degrees.
Preferably, the distance between the coagulant feeding port and the nearest baffle is 3-5 cm.
Preferably, a soda feeding port is arranged on the soda reaction tank.
Preferably, a coagulant aid feeding port is arranged on the flocculation reaction tank.
By adopting the technical scheme, the sedimentation tank provided by the utility model has the advantages that 1) the effluent turbidity and the effluent hardness are smaller, and the effluent quality is stable; 2) the tank wall can not reduce the volume due to lime scaling, and the stirring machines in the soda reaction tank, the flocculation reaction tank and the sludge discharge tank can stably run for a long time.
Drawings
Fig. 1 is a schematic structural view of a preferred sedimentation tank provided in the present invention;
fig. 2 is a top view of a preferred distribution channel according to the present invention;
fig. 3 is a schematic structural view of a preferred aeration tube provided in the present invention;
fig. 4 is a schematic cross-sectional view of a preferred line mixer according to the present invention.
Description of the reference numerals
1. Distribution canal 11, lime feeding pipe 111, charging hole 12 and baffle
13. Aerator pipe 131, positioning block 132, aeration hole valve 2 and pipeline mixer
21. Coagulant feeding port 22, baffle 3, soda reaction tank 31 and soda feeding port
4. A flocculation reaction tank 41, a coagulant aid feeding port 5, a mud discharging tank 6 and a stirrer
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The utility model provides a sedimentation tank, as shown in figure 1, the sedimentation tank comprises a water distribution channel 1, a pipeline mixer 2, a soda reaction tank 3, a flocculation reaction tank 4 and a sludge discharge tank 5 which are connected in sequence;
the water outlet end of the water distribution channel is conical, and a lime feeding pipe 11 is arranged above the water inlet end of the water distribution channel; a baffle plate 12 is arranged below the water outlet end of the water distribution channel; an aeration pipe 13 is arranged in the water distribution channel;
wherein, the water outlet end of the water distribution channel 1 is connected with the water inlet end of the pipeline mixer 2, and the water inlet end of the pipeline mixer 2 is provided with a coagulant feeding port 21.
The utility model discloses in, set up lime feeding pipe in the top of the end of intaking of distributing channel, can increase the turbidity that the pipe-line mixer was intake, be favorable to improving the effect of hydrolysising of coagulant. And the ditch water outlet end is conical setting, can increase into water potential energy, plays the water conservancy stirring effect, and the setting of baffle can cut the bubble, increases the mixed degree of lime and water, and the setting of aeration pipe can increase the disturbance of water, and three combined action, fungible mixer play the effect of stirring, has solved the mixer and has transshipped the problem of jumping out to stop because of the lime scale deposit, ensures that lime fully dissolves in aqueous to increase the turbidity of water.
In a preferred embodiment, the water inlet end of the distribution channel is cylindrical, square or rectangular, preferably cylindrical.
In a preferred embodiment, a plurality of feed openings 111 are provided in the lime feeding pipe 11. Wherein, the concrete quantity of charge door can adjust according to actual conditions, the utility model discloses do not specially limit. For example, 8-12 feed ports 111 may be provided.
For low turbidity water, a large amount of lime needs to be added during the wastewater treatment process. Current wastewater treatment plants typically feed lime in a 5 wt% lime water (suspension). Since lime is a sparingly soluble substance, lime water pipelines are susceptible to plugging due to lime deposition. Compared with a single charging opening, the arrangement of the plurality of charging openings can ensure the feeding amount of the lime water by increasing the feeding amount on the premise of reducing the concentration of the lime water (lime is configured into 2 wt% of the lime water), not only can reduce the risk of lime pipeline blockage, but also can avoid the phenomenon that the local lime concentration is too high to cause uneven reaction.
In a preferred embodiment, the lime water feed pipe 11 is arranged above the distribution canal in a straight, U-shaped or annular shape, preferably in a U-shaped or annular shape, as shown in fig. 2.
Compared with linear distribution, the U-shaped or annular arrangement can ensure that lime is fed more uniformly, and is favorable for further promoting the dispersibility of lime in the water distribution channel.
In a preferred embodiment, the aeration pipe 13 is a liftable aeration pipe, and a positioning block 131 is disposed at the lower end of the aeration pipe 13, and the positioning block 131 is used for adjusting the depth of the aeration pipe in the distribution channel 1, as shown in fig. 3.
Wherein, liftable aeration pipeline is used for increasing the mixing degree of lime, coagulant and water, utilizes the locating piece to adjust the degree of depth of aeration pipe in the distribution canal, conveniently carries out the lift operation to the aeration pipe, directly rises to ground with the aeration pipe and clears up, reduces the washing degree of difficulty of aeration pipe. Meanwhile, the positioning block can also play a role in fixing the aeration pipe, so that the aeration pipe is prevented from shaking under the action of air injection.
In a preferred embodiment, the aeration pipe 13 is disposed at one side of the distribution canal 1, and a plurality of aeration hole valves 132 are disposed on the aeration pipe 13, wherein the specific number of the aeration hole valves can be adjusted according to actual conditions, and the present invention is not limited specifically. For example, 3-5 aeration hole valves 132 may be provided.
Wherein, during operation, the aeration hole valve of aeration pipe can open automatically under air pressure, and the air is followed the aeration hole blowout, can form horizontal air current, drives the rivers and flows, plays the effect of stirring. When the air pressure disappears, the valve of the aeration hole of the aeration pipe can be automatically closed, and water is prevented from flowing back into the aeration pipe. And a plurality of aeration hole valves are arranged, so that the disturbance of water can be further increased, and the mixing effect of lime and water is improved.
In a preferred embodiment, the opening degree of the aeration hole valve 132 is gradually increased along the water distribution channel 1 from top to bottom direction of the aeration hole valve 132. Wherein, the deeper the position of aeration hole valve under water, the more the water pressure that receives is big, increases the aperture of aeration hole valve, can improve the mixing effect.
In a preferred embodiment, the baffles 12 are evenly distributed, preferably 4, over the conical outlet end wall surface of the distribution channel.
In a preferred embodiment, the line mixer 2 is a static line mixer in which baffle plates 22 are arranged every 5 to 8cm in the direction of the water flow, the angle of inclination α of the baffle plates 22 being 50 to 60 °.
Wherein, the inclination angle α of the baffle refers to the acute angle between the baffle and the outer wall of the pipeline mixer along the water flow direction, as shown in fig. 4.
In a preferred embodiment, the static pipe mixer is made of 304 stainless steel, and the distance between the coagulant feeding port 21 and the nearest baffle 22 is 3-5 cm. The distance between the coagulant feeding port 21 and the baffle 22 is controlled, so that the coagulant can be effectively prevented from being deposited on the pipe wall due to insufficient mixing, and the mixing effect of the pipeline fluid is improved. In the utility model, the distance from the coagulant feeding port 21 to the nearest baffle 22 means the minimum distance from the center of the coagulant feeding port 21 to the connecting point between the baffle 22 and the pipeline mixer 2.
In a preferred embodiment, the water outlet end of the pipeline mixer 2 is connected with the bottom water inlet of the soda reaction tank 3, the upper water outlet of the soda reaction tank 3 is connected with the bottom water inlet of the flocculation reaction tank 4, and the upper water outlet of the flocculation reaction tank 4 is connected with the upper water inlet of the sludge discharge tank 5.
In a preferred embodiment, a soda feeding port 31 is arranged on the soda reaction tank 3, and a coagulant aid feeding port 41 is arranged on the flocculation reaction tank 4; the soda reaction tank 3, the flocculation reaction tank 4 and the sludge discharge tank 5 are all provided with a stirrer 6.
Wherein, the utility model discloses do not do the special restriction to soda reaction tank, flocculation reaction tank and row's mud pond, the structure that the field is commonly used all can be used to the utility model discloses.
The present invention will be described in detail below by way of examples.
Examples
Introducing coal chemical wastewater (water quality is shown in Table 1) into a sedimentation tank shown in figure 1 for treatment, wherein the water inflow is 400m3Per hour, the adding amount of coagulant ferric trichloride (stock solution, 30 wt% concentration) is 1.2-1.5m3H, lime (2 wt% concentration) dosage of 2-3m3H, the adding amount of sodium carbonate (5 wt% concentration) is 0.5-1m3Per h, PAM (Polyacrylamide, 0.2 wt% concentration) dosage of 20m3/h。
In this embodiment, the sedimentation tank includes a distribution canal, a static pipe mixer, a soda ash reaction tank, a flocculation reaction tank and a sludge discharge tank. The water inlet end of the water distribution channel is cylindrical, the water outlet end of the water distribution channel is conical, a U-shaped lime feeding pipe is arranged above the water inlet end of the water distribution channel, and 12 feeding ports are uniformly formed in the U-shaped lime feeding pipe. One side of the water distribution channel is provided with a lifting aeration pipe, the aeration pipe is provided with 4 aeration hole valves, and the aeration pipe is fixed above four baffles arranged at the bottom of the water distribution channel by utilizing positioning blocks. The water inlet end of the static pipeline mixer is provided with a coagulant feeding port, baffle plates are arranged in the static pipeline mixer every 5cm along the water flow direction, the inclination angle alpha of each baffle plate is 50 degrees, and the distance between the coagulant feeding port and the nearest baffle plate is 4 cm. The effluent from the settling tank was tested three times and the results are shown in table 2.
Comparative example
Similar to the operation of example 1, the difference is that the settling tank in the comparative example has a rectangular channel, the outlet end is not provided with a baffle, no U-shaped lime feeding pipe is arranged above the channel, no lifting aeration pipe is arranged in the channel, a coagulation reaction tank with a stirrer and a lime reaction tank with a stirrer are used to replace a static pipe mixer, coagulant is added into the coagulation reaction tank, and lime (5 wt% concentration) is added into the lime reaction tank through a single feeding pipeline. The effluent from the settling tank was tested three times and the results are shown in table 3.
TABLE 1
TABLE 2
TABLE 3
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. In the technical idea scope of the present invention, it can be right to the technical solution of the present invention perform multiple simple modifications, including each technical feature combined in any other suitable manner, these simple modifications and combinations should be regarded as the disclosed content of the present invention, and all belong to the protection scope of the present invention.
Claims (10)
1. A sedimentation tank is characterized by comprising a water distribution channel, a pipeline mixer, a soda reaction tank, a flocculation reaction tank and a sludge discharge tank which are sequentially connected;
the water outlet end of the water distribution channel is conical, and a lime feeding pipe is arranged above the water inlet end of the water distribution channel; a baffle plate is arranged below the water outlet end of the water distribution channel; an aeration pipe is arranged in the water distribution channel;
the water outlet end of the water distribution channel is connected with the water inlet end of the pipeline mixer, and the water inlet end of the pipeline mixer is provided with a coagulant feeding port.
2. A sedimentation tank as claimed in claim 1, characterized in that a plurality of feed openings are provided in the lime feeding pipe.
3. A sedimentation tank as claimed in claim 1, wherein the lime feed pipes are arranged in a straight line, U-shape or annular shape above the distribution canal.
4. A sedimentation tank as claimed in claim 3, wherein the lime feed pipes are U-shaped or annularly distributed above the distribution canal.
5. The sedimentation tank as claimed in claim 1, wherein the aeration pipe is a liftable aeration pipe, and a positioning block is provided at a lower end of the aeration pipe, and the positioning block is used for adjusting the depth of the aeration pipe in the water distribution channel.
6. The sedimentation tank as claimed in claim 1, wherein the aeration pipe is provided at one side of the distribution channel, and a plurality of aeration hole valves are provided on the aeration pipe.
7. A sedimentation tank according to claim 1, wherein the pipe mixer is a static pipe mixer in which baffle plates are arranged every 5-8cm in the direction of the water flow, the angle of inclination α of the baffle plates being 50-60 °.
8. A sedimentation tank as claimed in claim 7, wherein the distance of the coagulant inlet to the nearest baffle is 3-5 cm.
9. A sedimentation tank as claimed in claim 1, wherein a soda ash feed port is provided on the soda ash reaction tank.
10. A sedimentation tank as claimed in claim 1, wherein a coagulant aid inlet is provided in the flocculation tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023345616.2U CN214327396U (en) | 2020-12-31 | 2020-12-31 | Sedimentation tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023345616.2U CN214327396U (en) | 2020-12-31 | 2020-12-31 | Sedimentation tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214327396U true CN214327396U (en) | 2021-10-01 |
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ID=77904680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023345616.2U Active CN214327396U (en) | 2020-12-31 | 2020-12-31 | Sedimentation tank |
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| Country | Link |
|---|---|
| CN (1) | CN214327396U (en) |
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2020
- 2020-12-31 CN CN202023345616.2U patent/CN214327396U/en active Active
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