CN114588666A - A low-pulsation inclined plate precipitation device - Google Patents

Abstract

The invention discloses a low-pulsation inclined plate sedimentation device which comprises a sedimentation tank, an inclined plate group, a perforated water collecting pipe and a perforated sludge discharge pipe, wherein a clear water area, an inclined pipe area, a water distribution area and a sludge accumulation area are sequentially arranged in the sedimentation tank from top to bottom, the perforated water collecting pipe is transversely arranged in the clear water area, the inclined plate group is fixedly arranged in the inclined pipe area, a water inlet is arranged at one side of the water distribution area, and the perforated sludge discharge pipe is transversely arranged in the sludge accumulation area. According to the invention, the perforated plate is arranged, so that particles uniformly fall into the next-stage space through the filtering holes in the gliding process, and are in convection collision with new flocculated sludge in the next-stage space, and continuously grow up under the action of contact flocculation to form large-particle precipitates, and then fall into the sludge accumulation area under the action of gravity to be discharged, thereby effectively avoiding the accumulation of sludge between the inclined plates and improving the precipitation efficiency.

Description

A low-pulsation inclined plate precipitation device

technical field

The invention relates to the technical field of water treatment equipment, and more particularly, to a low-pulsation inclined plate precipitation device.

Background technique

The inclined plate sedimentation tank is a high-efficiency combined sedimentation tank designed according to the shallow tank sedimentation theory, also known as the shallow tank sedimentation tank. Or sedimentation is carried out in the inclined pipe, the water flows upward along the inclined plate or inclined pipe, and the separated sludge slides down along the inclined plate (pipe) to the bottom of the pool under the action of gravity, and then is discharged centrally.

However, when the current inclined plate sedimentation tank is used for a long time or the water quality changes, the sedimented sludge continuously slides to the bottom of the inclined plate, which is easy to cause the accumulation of sludge between the inclined plates, thereby reducing the sedimentation efficiency and the water quality of the effluent. , and when the sludge accumulates to a certain extent, it will even collapse the inclined plate.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is that sludge accumulation easily occurs between the inclined plates of the existing inclined plate sedimentation tank, resulting in a decrease in the sedimentation efficiency. In order to overcome the defects of the prior art, the present invention proposes a low-pulsation inclined plate precipitation device. By setting a perforated plate, the particles can evenly fall into the next-level space through the filter holes during the sliding process, and are mixed with the next-level space in the next-level space. The new flocculated sludge undergoes convective collision, and grows continuously under the action of contact flocculation to form large particles, which are then discharged into the sludge accumulation area under the action of gravity, which effectively avoids the accumulation of sludge between the inclined plates and improves the sedimentation efficiency. .

For this purpose, the present invention adopts the following technical solutions:

The invention provides a low-pulsation inclined plate sedimentation device, comprising a sedimentation tank, an inclined plate group, a perforated water collecting pipe and a perforated mud discharge pipe. The sedimentation tank is provided with a clear water area, an inclined pipe area, a water distribution area and a mud accumulation area in sequence from top to bottom. The perforated water collecting pipe is arranged horizontally in the clear water area, the inclined plate group is fixed in the inclined pipe area, the water inlet is opened on one side of the water distribution area, and the perforated sludge discharge pipe is arranged horizontally in the mud accumulation area;

The inclined plate group includes a support rod, a inclined plate, a perforated plate and a partition plate. Two support rods are fixed laterally in the inclined tube area, and more than two inclined plates are fixed between the two support rods. The plates are arranged in parallel, the bottom end of the inclined plate is fixed with a perforated plate, the surface of the perforated plate is evenly provided with two or more filter holes, and the two adjacent inclined plates are fixedly connected by more than two partitions, and two or more The partitions are arranged in parallel.

In a preferred technical solution of the present invention, the length of the perforated plate is 10cm-30cm.

In a preferred technical solution of the present invention, both the perforated water collecting pipe and the perforated mud discharge pipe are provided with two or more through holes.

In a preferred technical solution of the present invention, the inclination angle of the inclined plate is 45°-70°.

In a preferred technical solution of the present invention, the distance between two adjacent inclined plates is 10mm-50mm.

In a preferred technical solution of the present invention, the distance between two adjacent partitions is 10cm-20cm.

The beneficial effects of the present invention are:

1. By setting the perforated plate, the particles fall evenly into the next-level space through the filter holes during the sliding process, and convectively collide with the new flocculated sludge in the next-level space, and continue to grow and form under the action of contact flocculation. Large particles are precipitated, and then fall into the sludge area for discharge under the action of gravity, which effectively avoids the accumulation of sludge between the inclined plates and improves the sedimentation efficiency.

2. By setting the perforated plate, the water flow channel between the inclined plates is lengthened, thereby prolonging the contact time of sewage between the inclined plates, and at the same time increasing the water flow resistance, thereby greatly increasing the uniformity of water distribution and realizing the uniform water distribution with large resistance. .

3. By setting the baffle, it is beneficial to the rising water flow to form a laminar flow state, and to avoid the water flow to form a small vortex, which will lead to the small particle sediment being supported to the clean water area, affecting the water quality of the effluent.

Description of drawings

1 is a schematic structural diagram of a low-pulsation inclined plate precipitation device provided by a specific embodiment of the present invention;

Fig. 2 is the three-dimensional structure diagram of the inclined plate group in Fig. 1;

FIG. 3 is the experimental parameters of feed water and sewage obtained under different conditions in this example.

In the picture:

1. Sedimentation tank; 11. Clear water area; 12. Inclined pipe area; 13. Water distribution area; 14. Mud accumulation area; 2. Inclined plate group; 21. Support rod; 22. Inclined plate; 23. Perforated plate; plate; 25. filter hole; 3. perforated water collecting pipe; 4. perforated mud discharge pipe; 5. water inlet; 6. through hole.

Detailed ways

The technical solutions of the present invention are further described below with reference to the accompanying drawings and through specific embodiments.

As shown in Figures 1-3, the embodiment provides a low-pulsation inclined plate sedimentation device, including a sedimentation tank 1, a inclined plate group 2, a perforated water collection pipe 3 and a perforated mud discharge pipe 4. A clear water area 11, an inclined pipe area 12, a water distribution area 13, and a mud accumulation area 14 are opened in sequence at the bottom. The clear water area 11 is provided with a perforated water collection pipe 3 laterally, and the inclined pipe area 12 is fixed with a set of inclined plates 2. One side of the water distribution area 13 A water inlet 5 is provided, and a perforated mud discharge pipe 4 is arranged laterally in the mud accumulation area 14;

The inclined plate group 2 includes a support rod 21, a inclined plate 22, a perforated plate 23 and a partition plate 24. Two support rods 21 are fixed laterally in the inclined tube area 12, and more than two inclined support rods are fixed between the two support rods 21. plate 22, and two or more inclined plates 22 are arranged in parallel, the bottom end of the inclined plate 22 is fixed with a perforated plate 23, the surface of the perforated plate 23 is evenly provided with two or more filter holes 25, and two adjacent inclined plates 22 The two or more partitions 24 are fixedly connected, and the two or more partitions 24 are arranged in parallel.

In this embodiment, the inclined plate 22 and the perforated plate 23 are integrally formed, and the perforated plate 23 and the extension line of the inclined plate 22 are overlapped. The two adjacent inclined plates 22 and the two adjacent partitions 24 form a water flow channel. In order to ensure the sedimentation efficiency, a turbidity sensor is installed in the water flow channel to detect the turbidity of sewage. When the density is lower than 10NTU, it is necessary to add a coagulant to it to ensure the concentration of impurity particles in the area where the perforated plate 23 is located and keep it above 150mg/L, so that it can form a reflocculated sludge layer or a contact Flocculation provides particle conditions; when the turbidity of the sewage in the water flow channel is higher than 10NTU, there is no need to add coagulant. Two or more inclined plates 22 are arranged in parallel, thereby forming a plurality of water flow channels, which helps to improve the space utilization efficiency of the sedimentation tank. The lower support rod 21 is fixedly connected. The diameter of the filter holes 25 is 10mm-30mm, and the distance between two adjacent filter holes 25 is 10mm. The rising flow rate of the sewage in the sedimentation tank 1 is controlled within the range of 2.0-3.5mm/s, so that the floc retention rate can reach more than 99%, and the effluent SS of the perforated water collection pipe 3 is less than or equal to 3mg/L.

Specifically, the length of the perforated plate 23 is 10cm-30cm. The length of the inclined plate 22 in the traditional inclined plate sedimentation tank is 1 m. In this embodiment, by setting the perforated plate 23, the length of the water flow channel is correspondingly extended by 10%-30%, thereby making the residence time of the water flow in the water flow channel. Correspondingly increases by 10%-20%, and the resistance of water flow increases by 10%-20%, which helps to greatly increase the uniformity of water distribution and achieve uniform water distribution with large resistance.

Specifically, both the perforated water collecting pipe 3 and the perforated mud discharge pipe 4 are provided with more than two through holes 6 . In this embodiment, by opening the through holes 6, the size of the water inlet of the perforated water collecting pipe 3 and the perforated mud discharge pipe 4 is increased, which is helpful to improve the efficiency of drainage and mud discharge.

Specifically, the inclination angle of the inclined plate 22 is 45°-70°. In this embodiment, the operator can select an appropriate inclination angle according to the speed of particle precipitation in the sewage. When the particle precipitation speed is fast, the inclination angle of the inclined plate 22 should also be set larger to ensure that the particles are deposited along the inclined plate 22. Quickly slide down to the area where the perforated plate 23 is located to prevent it from accumulating on the surface of the inclined plate 22 and affect the water flow rate.

Specifically, the distance between two adjacent inclined plates 22 is 10mm-50mm. In this embodiment, the distance between two adjacent inclined plates 22 can be reasonably selected according to needs, wherein the smaller the distance between two adjacent inclined plates 22, the better the quality of the effluent. When the distance between two adjacent inclined plates 22 is 10mm, the water flow channel is small, and the number of contact times of the colloid of small particles in a small space increases, so that the alum flower particles are rapidly precipitated; at the same time, according to the side wall effect, the water flow The reduction of the channel size will increase the resistance between the boundary layers, which will lead to large water flow resistance, so that the flow distribution in the sedimentation tank is uniform, and local flake leakage is avoided. The water quality effect is better than that under the condition of 35mm distance. In addition, by reducing the distance between two adjacent inclined plates 22, the space utilization efficiency of the sedimentation tank can be improved.

Specifically, the distance between two adjacent partitions 24 is 10cm-20cm. By setting the baffle 24, it is favorable for the rising water flow to form a laminar flow state and avoid the water flow from forming a small vortex, which in turn causes the small particle sediment to be supported to the clean water area 11, which affects the water quality of the effluent. When the distance between the adjacent two inclined plates 22 is controlled at 10mm, and the distance between the adjacent two partition plates 24 is controlled at 10cm, the resistance along the water flow channel is between 0.10mm-0.18mm; When the distance between the plates 22 is controlled at 35mm, and the distance between the two adjacent partition plates 24 is controlled at 20cm, the resistance along the water flow channel is between 0.009mm-0.016mm; when the distance between the two adjacent inclined plates exceeds 35mm, the The process resistance continues to decrease, and it is no longer suitable for the situation of water distribution with large resistance.

Working principle: When in use, the sewage enters into the water distribution area 13 through the water inlet 5. Under the action of the water inlet pressure, the sewage in the water distribution area 13 flows upward to the inclined pipe area 12, and the muddy water is separated on the inclined plate 22, and the muddy water is separated. During the separation process, clean water flows through the inclined plate group 2 to the clean water area 11, and flows out from the perforated water collecting pipe 3; the particulate impurities settle under the barrier of the inclined plate 22 and under the action of its own gravity, and fall along the inclined plate 22 to In the area where the perforated plate 23 is located, at this time, the sludge particles evenly enter the next-level space through the filter holes 25, form a uniform drop and convectively collide with the new flocculated sludge, so that the flocculation continues to grow and form large particles. The particles are precipitated and fall into the sludge accumulation area 14 under the action of gravity, and are then discharged by the perforated sludge discharge pipe 4, thereby purifying the water.

In order to illustrate the advantages of the structure of the present invention, the control variable method was used to compare and analyze the phase conditions under the same conditions (experimental water temperature t=20°C, water kinematic viscosity v=0.01cm ² /s, influent turbidity 100NTU), The influence of two adjacent inclined plates and two adjacent partitions on the sedimentation effect of sludge particles under different spacing conditions, the data shown in Figure 3 is obtained;

Among them, the specifications of the inclined plate are: the length is 1200mm, the width is 1200mm, and the thickness is 0.85mm; the filter hole diameter is 10mm, and the hole spacing is 10mm.

By comparing and analyzing the data in the table in Figure 3, it can be seen that the Reynolds number in the water supply experiment is in the range of 9.0-52.5, and the Reynolds number in the sewage is in the range of 26.2-70.0. A small Reynolds number can effectively suppress the hydraulic pulsation, thereby greatly reducing the detailed disturbance of the water flow. Negative effects on alum settlement. The Froude number in the feed water is in the range of 8.32×10 ^-5 -1.81×10 ^-4 , and the Froude number in the sewage is in the range of 2.04×10 ^-5 -9.46×10 ^-5 . The larger Froude number indicates the stability of the water. Stronger, thereby improving the precipitation effect.

The present invention has been described in terms of preferred embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. The present invention is not limited by the specific embodiments disclosed herein, and other embodiments falling within the claims of the present application all belong to the protection scope of the present invention.

Claims (6)

1. The utility model provides a low pulsation inclined plate precipitation device which characterized in that: the device comprises a sedimentation tank (1), an inclined plate group (2), a perforated water collecting pipe (3) and a perforated sludge discharging pipe (4), wherein a clear water area (11), an inclined pipe area (12), a water distribution area (13) and a sludge accumulation area (14) are sequentially arranged in the sedimentation tank (1) from top to bottom, the perforated water collecting pipe (3) is transversely arranged in the clear water area (11), the inclined plate group (2) is fixedly arranged in the inclined pipe area (12), a water inlet (5) is arranged on one side of the water distribution area (13), and the perforated sludge discharging pipe (4) is transversely arranged in the sludge accumulation area (14);

inclined plate group (2) are including bracing piece (21), swash plate (22), perforated plate (23) and baffle (24), two bracing pieces (21) have transversely set firmly in inclined tube district (12), swash plate (22) more than two have set firmly between two bracing pieces (21), and swash plate (22) parallel arrangement more than two, perforated plate (23) have set firmly in the bottom of swash plate (22), filtration pore (25) more than two have evenly been seted up on perforated plate (23) surface, two adjacent swash plates (22) are through baffle (24) fixed connection more than two, and baffle (24) parallel arrangement more than two.

2. The low pulsation inclined plate sedimentation device according to claim 1, wherein: the length of the perforated plate (23) is 10cm-30 cm.

3. The low pulsation inclined plate sedimentation device according to claim 1, wherein: more than two through holes (6) are formed in the perforated water collecting pipe (3) and the perforated sludge discharging pipe (4).

4. The low pulsation inclined plate sedimentation device according to claim 1, wherein: the inclination angle of the inclined plate (22) is 45-70 degrees.

5. The low pulsation inclined plate sedimentation device according to claim 1, wherein: the distance between two adjacent sloping plates (22) is 10mm-50 mm.

6. The low pulsation inclined plate sedimentation device according to claim 1, wherein: the distance between two adjacent partition plates (24) is 10cm-20 cm.

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