CN112023457A

CN112023457A - Ultra-shallow layer horizontal sedimentation tank

Info

Publication number: CN112023457A
Application number: CN202010672921.8A
Authority: CN
Inventors: 镇祥华; 万年红; 张立; 陈燕波; 李跃增; 朱建国
Original assignee: Central and Southern China Municipal Engineering Design and Research Institute Co Ltd
Current assignee: Central and Southern China Municipal Engineering Design and Research Institute Co Ltd
Priority date: 2020-07-14
Filing date: 2020-07-14
Publication date: 2020-12-04
Anticipated expiration: 2040-07-14
Also published as: CN112023457B

Abstract

The invention relates to the technical field of water treatment and discloses an ultra-shallow horizontal sedimentation tank which is sequentially provided with a water distribution area, a sedimentation area and a water collection area along the water flow direction, wherein the bottoms of the water distribution area and the water collection area are both provided with sludge areas, and a plurality of horizontal sedimentation units are arranged in the sedimentation area; the sedimentation tank still arranges the mud device including the upset, advection precipitation unit connects on the mud device is arranged in the upset, starts when the mud device is arranged in the upset, the contained angle of advection precipitation unit and horizontal liquid level changes, reaches the purpose of intensive row mud.

Description

Ultra-shallow layer horizontal sedimentation tank

Technical Field

The invention relates to the technical field of water treatment, in particular to an ultra-shallow horizontal sedimentation tank.

Background

The sedimentation tank removes suspended matters in water by using the natural sedimentation or coagulating sedimentation effect of the water. The sedimentation tank has various types, and can be divided into a horizontal sedimentation tank and a vertical sedimentation tank according to the water flow direction. The sedimentation effect is determined by the flow rate of water and the settling velocity of particles, and the slowing of the flow rate of the water and the increasing of the settling velocity of the particles are both beneficial to improving the sedimentation effect. The sand adding sedimentation tank and the magnetic coagulation sedimentation tank artificially enhance the sedimentation speed of particles by the modes of adding sand and adding magnets.

For the horizontal sedimentation tank, the flow rate of water and the settling velocity of particles are also related to the length of the sedimentation tank and the depth of the sedimentation tank, and assuming that the length of the sedimentation tank is L, the depth of the sedimentation tank is H, the horizontal flow rate in the sedimentation tank is V, and the settling velocity of the particles is u₀Under ideal conditions, L/H is V/u₀. It can be seen that when the values of L and V are unchanged, the shallower the tank body is, the smaller the suspended particles can be removed, which is the "shallow layer sedimentation theory" proposed by Harvard, and the inclined tube sedimentation tank and the horizontal tube sedimentation tank are developed on the basis of the theory. Because the tank type adopting the shallow sedimentation theory needs to give consideration to the effects of sedimentation and natural sludge discharge, the shallow sedimentation characteristic is not fully utilized, and the problem that a sludge discharge channel needs to be cleaned after long-time use is solved. If the algae content of the inlet water is high, the inclined pipe needs to be manually cleaned once in about 1 month, and the workload is huge. The hydraulic load of the horizontal pipe sedimentation tank is higher than that of the inclined pipe sedimentation tank, but the natural sludge discharge channel is narrow, and the hydraulic cleaning is needed for one time in 1-2 days basically so as to ensure the treatment efficiency. Since some settling ponds based on the shallow settling theory cannot completely remove the sludge by means of natural sliding and sludge removal, the problem that manual cleaning is needed exists.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides an ultra-shallow horizontal sedimentation tank which makes full use of the shallow sedimentation theory, has higher sedimentation efficiency, and adopts a 90-degree overturning sludge discharge mode to strengthen sludge discharge so as to improve the unit volume utilization rate of the sedimentation tank.

In order to achieve the above purpose, the technical scheme of the invention is as follows:

a super-shallow layer horizontal sedimentation tank is sequentially provided with a water distribution area, a sedimentation area and a water collection area along the water flow direction, wherein the bottoms of the water distribution area and the water collection area are respectively provided with a sludge area, and a plurality of horizontal sedimentation units are arranged in the sedimentation area; the sedimentation tank still arranges the mud device including the upset, advection precipitation unit connects on the mud device is arranged in the upset, starts when the mud device is arranged in the upset, the contained angle of advection precipitation unit and horizontal liquid level changes, reaches the purpose of intensive row mud.

In the technical scheme, a plurality of horizontal partition plates and vertical partition plates are arranged in the settling zone, the horizontal partition plates and the vertical partition plates are fixedly connected to form a settling module, and the settling module divides the settling zone into a plurality of advection settling units.

In the technical scheme, the mud device is arranged in the upset includes trip shaft, connecting axle, arc track and rail running gear, the bottom that deposits the module and is close to one side of water distribution district is passed through the trip shaft rotates with the bottom of the pool and is connected, the top that deposits the module and is close to one side of water collection area is passed through the connecting axle is connected with rail running gear, the top at the sedimentation tank is fixed to the arc track, rail running gear sliding connection is on the arc track.

Preferably, in the above technical solution, the distance between the horizontal partition plates gradually increases from top to bottom.

Preferably, in the above technical solution, a water collecting tank and an overflow weir are arranged in the water collecting area; the sludge area is of a trapezoidal structure, and a sludge discharge device is arranged at the bottom of the sludge area; the water distribution area is provided with a water inlet hole, and the water inlet hole is arranged at a position close to the bottom end of the water distribution area.

The invention has the beneficial effects that: each advection sedimentation unit in the sedimentation zone can independently complete the corresponding mud-water separation task, thereby reducing the disturbance and short flow phenomena of water flows, shortening the sedimentation time, reducing the sedimentation distance and the occupied area of an advection sedimentation tank and enhancing the sedimentation effect. In the sedimentation module, the distance between the lower horizontal partition plates is larger than that between the upper horizontal partition plates, and the influence of the sedimentary sludge on the overflowing channel can be reduced by properly enlarging the distance due to the large amount of the lower sludge; the upper layer sludge amount is small, and the interval is small, so that the effluent quality can be ensured to be good. Utilize the upset to arrange the mud device, can overturn sediment module to the water distribution district, advection sediment unit becomes perpendicularly by the level this moment, reaches thoroughly row mud, and the effect is far away better than general row mud mode.

Drawings

FIG. 1 is a top view of a horizontal sedimentation tank in an embodiment (a turnover sludge discharge device is omitted);

FIG. 2 is a cross-sectional view taken along the line A-A in FIG. 1;

FIG. 3 is a schematic diagram of an inverted structure of a sedimentation module of the horizontal flow sedimentation tank in the embodiment;

fig. 4 is a schematic perspective view of the precipitation module in the embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 4, an ultra-shallow layer horizontal sedimentation tank is provided with a water distribution area 1, a sedimentation area 2 and a water collection area 4 in sequence along a water flow direction, the bottoms of the water distribution area 1 and the water collection area 4 are both provided with a sludge area 3, the bottom of the water distribution 1 is provided with a water inlet 11, the bottom of the sludge area 3 is of a trapezoidal structure and is provided with a sludge discharge device for removing sludge, and the water collection area 4 is internally provided with a water collection tank 41 and an overflow weir 42; a precipitation module 23 is arranged in the precipitation zone 2, the precipitation module 23 consists of a plurality of horizontal partition plates 21 and vertical partition plates 22, and the precipitation module 23 divides the precipitation zone 3 into a plurality of advection precipitation units 24; in the specific embodiment, the distance between the horizontal partition plates 21 in the precipitation module 23 is gradually increased from top to bottom, so as to obtain better precipitation effect.

The sedimentation tank is also provided with an overturning sludge discharge device 5, and the overturning sludge discharge device 5 comprises an overturning shaft 51, a connecting shaft 52, an arc-shaped track 53 and a track travelling mechanism 54; the arc-shaped track 53 is fixed on the sedimentation tank, the water distribution area and the sedimentation area are arranged below the radian of the arc-shaped track, and the height of the arc-shaped track 53 is determined according to the size of the sedimentation module 23; the track traveling mechanism 54 is slidably connected to the arc-shaped track 53 and can freely reach from one end of the track to the other end of the track, and in a specific embodiment, the track traveling mechanism 54 comprises a motor and the like to avoid manual operation; the turnover shaft 51 is fixed at the bottom of the sedimentation zone, and particularly at the junction of the sedimentation zone and the water distribution zone, the sedimentation module 23 is rotationally connected with the turnover shaft 51; the top end of the precipitation module 23 close to the side surface of the water collecting area is connected with a track walking mechanism 54 through a connecting shaft 52; the connecting shaft 52 and the turning shaft 51 are respectively on two opposite corners of the precipitation module 23, and further, their lengths are as wide as the precipitation module.

When the horizontal sedimentation tank normally carries out sedimentation operation, water to be precipitated after thorough mixing and flocculation enters the water distribution area 1 through the water inlet 11, part of flocculated particles in the water distribution area fall into the sludge area after being separated from the water body, water flow continuously flows into the sedimentation module 23 of the sedimentation area 2, and each horizontal sedimentation unit 24 in the module can independently carry out mud-water separation, so that the sedimentation distance is favorably reduced, and the turbulence and mutual disturbance between fluids are reduced. After mud-water separation in the settling zone 2, sludge is retained in the advection sedimentation unit 24, the settled water enters the water collection zone 4, a small part of fine particles which are not removed in the advection sedimentation unit 24 continue settling in the advection sedimentation unit, the settled particles fall into the sludge zone at the bottom, and the upper clear water flows out through the overflow weir 42 at the upper part of the water collection zone 4, enters the water collection tank 41 and finally flows out as the final effluent of the sedimentation tank.

After the operation for a period of time (1-2 d), because the amount of sludge in the advection precipitation unit 24 is increased, the amount of discharged water is reduced, the water level in the water distribution area rises or the turbidity of discharged water in the water collection area rises, at this moment, sludge discharge can be considered, water inlet of the sedimentation tank is stopped, the overturning sludge discharge device 5 is started, the track walking mechanism 54 runs from the end A to the end B along the arc-shaped track 53, meanwhile, the precipitation module 23 is driven by the connecting shaft 52 to integrally overturn around the overturning shaft 51, so that each advection precipitation unit 24 overturns 90 degrees and moves from the horizontal position to the vertical position, the precipitated sludge in the advection precipitation unit 24 falls into the gliding sludge area under the action of gravity along the partition plate, the whole sludge discharge process is completed, then the overturning sludge discharge device 5 resets, and the next precipitation period. The sludge discharge period is determined according to the water quality of inlet water, sludge is discharged once in 1-2 d basically, the sludge discharge time is basically within 2 minutes every time, and the treatment load of the sedimentation tank cannot be influenced.

The above-described embodiments of the apparatus are merely illustrative, wherein the units described as separate parts may or may not be physically separate, and some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. An ultra-shallow layer horizontal sedimentation tank is characterized in that the sedimentation tank is sequentially provided with a water distribution area (1), a sedimentation area (2) and a water collection area (4) along the water flow direction, the bottoms of the water distribution area (1) and the water collection area (4) are respectively provided with a sludge area (3), and a plurality of horizontal sedimentation units (24) are arranged in the sedimentation area (2); the sedimentation tank still arranges mud device (5) including the upset, advection precipitation unit connects on upset row mud device (5), starts when upset row mud device, advection precipitation unit changes with the contained angle of horizontal liquid level.

2. The ultra-shallow horizontal sedimentation tank according to claim 1, wherein a plurality of horizontal partition plates (21) and vertical partition plates (22) are arranged in the sedimentation zone, the horizontal partition plates (21) and the vertical partition plates (22) are fixedly connected to form a sedimentation module (23), and the sedimentation module (23) divides the sedimentation zone (2) into a plurality of horizontal sedimentation units (24).

3. The ultra-shallow stratosphere sedimentation tank according to claim 2, wherein the overturning sludge discharge device (5) comprises an overturning shaft (51), a connecting shaft (52), an arc-shaped rail (53) and a rail travelling mechanism (54), the bottom end of one side of the sedimentation module (23) close to the water distribution area (1) is rotatably connected with the bottom of the tank through the overturning shaft (51), the top end of one side of the sedimentation module (23) close to the water collection area (4) is connected with the rail travelling mechanism (54) through the connecting shaft (52), the arc-shaped rail (53) is fixed above the sedimentation tank, and the rail travelling mechanism (54) is slidably connected on the arc-shaped rail (53).

4. The ultra-shallow horizontal flow sedimentation tank as claimed in claim 2, wherein the spacing between the horizontal partitions (21) becomes gradually larger from top to bottom.

5. The ultra-shallow horizontal flow sedimentation tank according to claim 1, wherein a water collection tank (41) and an overflow weir (42) are provided in the water collection zone (4).

6. The ultra-shallow horizontal flow sedimentation tank as claimed in claim 1, wherein the sludge zone (3) is of a trapezoidal structure, and a sludge discharge device is arranged at the bottom of the sludge zone (3).

7. The ultra-shallow horizontal sedimentation tank according to claim 1, wherein the water distribution area (1) is provided with water inlet holes (11), and the water inlet holes (11) are arranged at a position close to the bottom end of the water distribution area.