Integrated flocculation sedimentation tank

Abstract

The utility model relates to an integrated flocculation and sedimentation tank which comprises a flocculation zone and a sedimentation zone which are integrated, an inner cavity of the flocculation area is divided into a plurality of baffling areas by second partition plates, the baffling areas are communicated end to end to form an S-shaped circulation channel, a water inlet is formed in one end of the circulation channel, and a water outlet is formed in the other end of the circulation channel; the settling zone is divided into a water inlet zone and a settling zone by a vertical third partition plate, the bottom of the water inlet zone is communicated with the bottom of the settling zone, and the water outlet is communicated with the water inlet zone; a settling assembly is arranged in the settling area, and a sludge collecting hopper is arranged below the settling assembly; and a horizontal water outlet groove is formed above the sedimentation assembly. The wastewater added with the flocculating agent enters the flocculation area, suspended matters in the wastewater are contacted with the flocculating agent and are agglomerated, and as the circulation channel of the flocculation area is S-shaped, the flowing path of the wastewater in the flocculation area can be prolonged, and the retention time can be prolonged, so that the mixing time of the suspended matters and the flocculating agent is prolonged, the suspended matters are ensured to be fully contacted with the flocculating agent, and the flocculation effect is improved.

Description

Technical Field

[0001] The utility model belongs to the field of sewage treatment equipment, in particular to an integrated flocculation sedimentation tank. Background Art

[0002] Flocculation and sedimentation are commonly used facilities in wastewater treatment systems. Their function is to cause suspended matter in wastewater to condense into agglomerates and separate them out by sedimentation. Existing flocculation tanks and sedimentation tanks are generally set separately and occupy a large area. CN201922031658.X discloses an integrated water purification device for mines, which integrates the flocculation area, sedimentation area and filtration area into one, reducing the area occupied by the equipment. When the equipment is in operation, a flocculant is added to the flocculation area, and the suspended matter in the wastewater condenses into agglomerates after contact with the flocculant, and then settles. Since it takes a certain amount of time for the suspended matter to fully combine with the flocculant, the wastewater is directly passed into the sedimentation area after the flocculant is added. It is difficult for the suspended matter to fully combine with the flocculant, especially the suspended matter with a smaller particle size, resulting in poor flocculation and sedimentation effects. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an integrated flocculation sedimentation tank, which can prolong the combination time of suspended matter and flocculant and improve the removal rate of suspended matter.

[0004] In order to solve the above problems, the technical solution adopted by the utility model is: an integrated flocculation sedimentation tank, including an integrated flocculation zone and a sedimentation zone;

[0005] The inner cavity of the flocculation zone is divided into a plurality of baffle zones by a second partition plate, and the plurality of baffle zones are connected end to end to form an S-shaped flow channel, wherein a water inlet is provided at one end of the flow channel, and a water outlet is provided at the other end;

[0006] The sedimentation area is divided into a water inlet area and a sedimentation area by a vertical third partition. The bottom of the water inlet area is connected to the bottom of the sedimentation area, and the water outlet is connected to the water inlet area. A sedimentation component is arranged in the sedimentation area, a sludge collecting bucket is arranged below the sedimentation component, and a sludge discharge pipe is arranged at the bottom of the sludge collecting bucket. A horizontal water outlet trough is arranged above the sedimentation component.

[0007] Furthermore, the sedimentation assembly is an inclined tube sedimentation assembly or an inclined plate sedimentation assembly.

[0008] Furthermore, an L-shaped water inlet groove is arranged on one side of the third partition plate facing the water inlet area, and a water inlet hole is arranged on the side wall of the water inlet groove between the sedimentation assembly and the sludge collecting bucket.

[0009] Furthermore, a water barrier is provided between the outer side wall of the sedimentation assembly and the side wall of the sedimentation area.

[0010] Furthermore, each baffle is divided into a plurality of mixing chambers by a first partition. Among two adjacent first partitions, a plurality of micropores connecting the two adjacent mixing chambers are arranged on the top of one of the first partitions, and a plurality of first micropores connecting the two adjacent mixing chambers are arranged on the bottom of the other first partition, so that the wastewater flows along a wavy path in each baffle; a plurality of second micropores connecting the two adjacent rows of mixing chambers are arranged on the top or bottom wall of one end of the second partition.

[0011] Furthermore, the first partition plate and the second partition plate each include a plurality of inclined plates sequentially connected from top to bottom, and the horizontal cross-sectional area of ​​each mixing chamber changes from top to bottom.

[0012] Furthermore, the angle between two adjacent inclined plates is 90°.

[0013] The beneficial effects of the utility model are as follows: wastewater with added flocculant enters the flocculation zone through the water inlet, and suspended matter in the wastewater contacts with the flocculant and condenses into agglomerates; since the flow channel in the flocculation zone is S-shaped, the flow path of the wastewater in the flocculation zone can be extended, and the residence time can be increased, thereby extending the mixing time of the suspended matter and the flocculant, ensuring that the suspended matter is fully in contact with the flocculant, improving the flocculation effect, and reducing residual suspended matter. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a main schematic diagram of the utility model;

[0015] Figure 2 It is a top view schematic diagram of the flocculation zone;

[0016] Figure 3 yes Figure 2 Schematic cross-sectional view of AA in the figure;

[0017] Figure markings: 1—flocculation zone; 2—mixing chamber; 3—first partition; 4—second partition; —first micropore; 6—second micropore; 7—water inlet; 8—water outlet; 11—sedimentation zone; 12—third partition; 13—water inlet zone; 14—sedimentation zone; 15—sludge collecting bucket; 16—sludge discharge pipe; 17—water outlet trough; 18—sedimentation assembly; 20—water inlet trough; 21—water inlet hole; 22—water baffle. DETAILED DESCRIPTION

[0018] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0019] The integrated flocculation sedimentation tank of the utility model is as follows: Figures 1 to 3As shown, it includes an integrated flocculation area 1 and a sedimentation area 11. The flocculation area 1 and the sedimentation area 11 can be a rectangular pool body, and can be made of metal plates or concrete. The flocculation area 1 and the sedimentation area 11 are integrated into one, which can reduce the floor space. After being manufactured in the factory, they can be transported to the site for installation, reducing the difficulty of on-site construction.

[0020] The inner cavity of the flocculation zone 1 is divided into a plurality of baffle zones by the second partition 4. The plurality of baffle zones are connected end to end to form an S-shaped flow channel. A water inlet 7 is provided at one end of the flow channel, and a water outlet 8 is provided at the other end. The water inlet 7 is used to pass the wastewater into the flocculation zone 1, and the water outlet 8 is used to discharge the wastewater. The flocculation zone 1 is divided into an S-shaped flow channel by the second partition 4. The wastewater flows along the flow channel, which can extend the flow path of the wastewater, increase the residence time of the wastewater in the flocculation zone 1, and ensure that the flocculant and the suspended matter are fully contacted and condensed. The flocculant can be added to the wastewater before entering the flocculation zone 1, or it can be added to the wastewater when entering the flocculation zone 1.

[0021] The sedimentation area 11 is divided into an inlet area 13 and a settling area 14 by a vertical third partition 12. The bottom of the inlet area 13 is connected to the bottom of the settling area 14, and the water outlet 8 is connected to the inlet area 13. There is a gap between the lower end of the third partition 12 and the bottom wall of the sedimentation area 11, and the wastewater can pass through the gap. The water outlet 8 is located on the side wall of the sedimentation area 11 and also on the side wall of the inlet area 13. A sedimentation assembly 18 is provided in the sedimentation area 14. The sedimentation assembly 18 is used to improve the sedimentation efficiency of particles. Specifically, an inclined tube sedimentation assembly or an inclined plate sedimentation assembly can be used. The inclined tube sedimentation assembly is composed of a plurality of inclined plates that are inclined and parallel to each other. There is a sedimentation gap between two adjacent inclined plates. The wastewater enters the wastewater gap from bottom to top and is in a horizontal flow state. The particles carried can settle on the inclined plates faster. The inclined tube sedimentation assembly is composed of a plurality of inclined pipes, the inner cavity of which can allow wastewater to pass through, and the wastewater is also in a horizontal flow state in the pipe, so that particles can settle quickly. A sludge collecting bucket 15 is arranged below the sedimentation assembly 18, and a sludge discharge pipe 16 is arranged at the bottom of the sludge collecting bucket 15. The upper end opening of the sludge collecting bucket 15 is larger, and the lower end is smaller, which is conducive to the sludge being concentrated at the bottom of the sludge collecting bucket 15. The sludge discharge pipe 16 is used to discharge the sludge, and can be connected to a sludge pump as a sewage discharge power. A horizontal water outlet trough 17 is arranged above the sedimentation assembly 18. The cross section of the water outlet trough 17 is U-shaped. After the wastewater flows through the sedimentation assembly 18 from bottom to top, the particles inside are removed, and a supernatant is formed above the sedimentation assembly 18. The supernatant overflows into the water outlet trough 17 and flows out of the sedimentation area 11 along the water outlet trough 17. A plurality of water outlet grooves 17 can be provided, and a general drainage groove can also be provided at the outlets of the plurality of water outlet grooves 17 .

[0022] In order to ensure that the wastewater is located between the settling assembly 18 and the sludge collecting bucket 15 after entering the settling area 14, an L-shaped water inlet groove 20 is provided on the side of the third partition plate 12 facing the water inlet area 13, and a water inlet hole 21 is provided on the side wall of the water inlet groove 20 between the settling assembly 18 and the sludge collecting bucket 15. After entering the water inlet area 13, the wastewater enters the water inlet groove 20 and then enters the settling area 14 through the water inlet hole 21.

[0023] The sedimentation assembly 18 is generally installed on a bracket. After installation, there may be a certain gap between the edge of the sedimentation assembly 18 and the side wall of the sedimentation area 14. A small amount of wastewater will flow directly from the gap to the top of the sedimentation assembly 18. The particles in the wastewater are not fully settled. Therefore, a water barrier 22 is provided between the outer wall of the sedimentation assembly 18 and the side wall of the sedimentation area 14. The water barrier 22 plays a role of water blocking, and can close the gap between the sedimentation assembly 18 and the side wall of the sedimentation area 14 to prevent wastewater from flowing to the top of the sedimentation assembly 18 without passing through the sedimentation assembly 18. The specific position of the water barrier 22 is determined according to the actual situation after the installation of the sedimentation assembly 18. If there is a gap between the outer wall of the sedimentation assembly 18 and the side wall of the sedimentation area 14 after the installation of the sedimentation assembly 18, the water barrier 22 is installed to close the gap. If there is no gap, the water barrier 22 does not need to be installed.

[0024] Some wastewater, such as phosphate mine water, has small suspended matter, light specific gravity, and slow sedimentation rate. The diameter of suspended particles in mine water is small, averaging only 2 to 8 microns, and more than 85% of the total suspended matter has a particle size below 5 microns; the ζ potential of suspended matter in mine water is -30.15 to -19.14 mV, all showing varying degrees of negative charge, making the suspended matter in mine water behave like colloidal particles, difficult to settle freely, difficult to form alum flocs during coagulation, and poor sedimentation effect. Traditional flocculation and clarification technology relies on a stirrer to force the mine water and reagents to stir and react. Due to continuous hydraulic agitation, the alum flocs that have been flocculated are easily destroyed, and it is difficult to form stable and larger alum flocs, resulting in the inability to capture phosphate rock powder with a particle size of about 5um during mine water treatment. As the wastewater is entrained, the phosphate mine wastewater treatment exceeds the standard, with a value of more than 0.2 mg / L.

[0025] In order to promote the full coagulation of fine suspended matter and flocculant in the wastewater, each baffle area of ​​the utility model is divided into multiple mixing chambers 2 by a first partition 3. Among two adjacent first partitions 3, the top of one of the first partitions 3 is provided with multiple micropores connecting the two adjacent mixing chambers 2, and the bottom of the other first partition 3 is provided with multiple first micropores 5 connecting the two adjacent mixing chambers 2, so that the wastewater flows along a wavy path in each baffle area; the top or bottom wall of one end of the second partition 4 is provided with multiple second micropores 6 connecting the two adjacent rows of mixing chambers 2.

[0026] Each mixing chamber 2 has an inlet side and an outlet side. Wastewater enters the mixing chamber 2 from the top or bottom of the inlet side and is discharged from the mixing chamber 2 from the top or bottom of the outlet side. When wastewater enters a mixing chamber 2 from the top of the inlet side, it is discharged from the bottom of the outlet side. When wastewater enters a mixing chamber 2 from the bottom of the inlet side, it is discharged from the top of the outlet side. This ensures that the flow direction of the wastewater changes after entering the next mixing chamber 2. At the same time, it can increase the flow path of the wastewater, extend the residence time of the wastewater in the flocculation tank 1, and ensure sufficient flocculation reaction.

[0027] By arranging a large number of first micropores 5 on the first partition plate 3 and a large number of second micropores 6 on the second partition plate 4, when the wastewater passes through the first micropores 5 and the second micropores 6, the flow velocity will change, and because the wastewater moves along a wavy path, the flow direction of the wastewater changes after passing through the micropores. The change in flow direction and flow velocity causes a large number of tiny vortices to appear in the wastewater. The tiny vortices can effectively bridge the positive and negative charges of phosphate rock powder particles with a particle size of 2 to 8 microns, promote the full collision and coagulation of fine particles in the water and the reagent, and then through multi-stage deflection, extend the hydraulic retention time, so that a large number of flocs (alum flowers) with larger particle sizes accumulate in the reactor and suspend in the water, thereby realizing rapid destabilization, flocculation and agglomeration of the phosphate wastewater, thereby realizing solid-liquid separation, effectively capturing and intercepting the phosphate rock powder in the mine water, and reducing the effluent phosphorus in the mine water to between 0.08 and 0.15 mg / L, which is lower than the surface water quality standard of Class III (phosphorus ≤ 0.2 mg / L).

[0028] The first baffle 3 and the second baffle 4 each include a plurality of inclined plates connected in sequence from top to bottom, and the horizontal cross-sectional area of ​​each mixing chamber 2 changes from top to bottom. The first baffle 3 and the second baffle 4 are each composed of a plurality of inclined plates, and the angle between the inclined plates and the horizontal plane is an acute angle or an obtuse angle, so that the horizontal cross-sectional area of ​​the mixing chamber 2 changes from top to bottom. Therefore, when the wastewater flows from top to bottom or from bottom to top, the area of ​​the flow channel is constantly changing, so the flow rate of the wastewater will also change, which is conducive to the formation of turbulence and promotes the full collision and coagulation of fine particles and reagents in the water.

[0029] The angle between two adjacent inclined plates can be 45°, 60°, 90°, 120°, etc., and flocculant PAC and coagulant aid polyacrylamide (12 million molecular weight, solid content: ≥90%) are added to the phosphorus-containing raw water with a concentration of 30 mg / L, and then the raw water is respectively passed into the flocculation tank 1 with inclined plate angles of 45°, 60°, 90°, and 120° for flocculation reaction, and the phosphorus concentration of the sampled sediment at the outlet of the flocculation tank 1 and the supernatant after 30 minutes of precipitation is measured. In order to compare the effects of inclined plates at different angles on the flocculation reaction effect of phosphorus-containing wastewater, the structure is shown in the following table:

[0030]

[0031]

[0032] It can be seen that when the angle between two adjacent inclined plates is 90°, the flocculation effect is best.

[0033] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Integrated flocculation sedimentation tank, characterized by: It comprises an integrated flocculation zone (1) and a sedimentation zone (11); The inner cavity of the flocculation zone (1) is divided into a plurality of baffle zones by a second partition plate (4), and the plurality of baffle zones are connected end to end to form an S-shaped flow channel, wherein a water inlet (7) is provided at one end of the flow channel, and a water outlet (8) is provided at the other end; The sedimentation zone (11) is divided into a water inlet zone (13) and a sedimentation zone (14) by a vertical third partition (12); the bottom of the water inlet zone (13) is connected to the bottom of the sedimentation zone (14); the water outlet (8) is connected to the water inlet zone (13); a sedimentation component (18) is arranged in the sedimentation zone (14); a sludge collection bucket (15) is arranged below the sedimentation component (18); a sludge discharge pipe (16) is arranged at the bottom of the sludge collection bucket (15); and a horizontal water outlet trough (17) is arranged above the sedimentation component (18).

2. The integrated flocculation sedimentation tank according to claim 1, characterized in that: The sedimentation assembly (18) is an inclined tube sedimentation assembly or an inclined plate sedimentation assembly.

3. The integrated flocculation sedimentation tank according to claim 1, characterized in that: An L-shaped water inlet groove (20) is provided on one side of the third partition plate (12) facing the water inlet area (13), and a water inlet hole (21) is provided on the side wall of the water inlet groove (20) between the sedimentation assembly (18) and the sludge collection bucket (15).

4. The integrated flocculation sedimentation tank according to claim 1, characterized in that: A water barrier (22) is provided between the outer side wall of the sedimentation assembly (18) and the side wall of the sedimentation area (14).

5. The integrated flocculation sedimentation tank according to claim 1, characterized in that: Each baffle area is divided into a plurality of mixing chambers (2) by a first baffle (3); in two adjacent first baffles (3), a plurality of micropores for connecting the two adjacent mixing chambers (2) are arranged on the top of one of the first baffles (3), and a plurality of first micropores (5) for connecting the two adjacent mixing chambers (2) are arranged on the bottom of the other first baffle (3), so that the wastewater flows along a wavy path in each baffle area; and a plurality of second micropores (6) for connecting the two adjacent rows of mixing chambers (2) are arranged on the top or bottom wall of one end of the second baffle (4).

6. The integrated flocculation sedimentation tank according to claim 5, characterized in that: The first partition plate (3) and the second partition plate (4) both comprise a plurality of inclined plates connected in sequence from top to bottom, and the horizontal cross-sectional area of ​​each mixing chamber (2) changes from top to bottom.

7. The integrated flocculation sedimentation tank according to claim 6, characterized in that: The angle between two adjacent inclined plates is 90°.

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