KR200407669Y1 - Sludge discharging structure in solid/liquid separator or sludge thickener - Google Patents

Abstract

The present invention relates to the sludge discharge structure of solid-liquid separation and concentration facilities, and increases the concentration of pulverized sludge in sedimentation basins or tanks in the wastewater treatment facilities of water treatment plants. It is to reduce the operating cost and disposal cost of sludge by reducing the operating time and reducing the dehydration cake moisture content. The hopper 12 of the sedimentation basin or concentration tank 10 is formed in a circular shape, and the sludge drawing pipe at the bottom of the hopper 12 is (20), but the sludge drawing pipe is considered to have an acceleration in the northern hemisphere counterclockwise (clockwise in the southern hemisphere) due to the Coriolis effect (turning force), where sludge with very low flow velocity is affected by global rotation. Bent in the direction in which the turning force acts (counterclockwise in the northern hemisphere, clockwise in the southern hemisphere) It is designed to reduce the dehydrator operation time and disposal cost by improving the concentration and dehydration efficiency by turning the sludge to be drawn so that the turning force is applied to the sludge without being accumulated.

Water purification plant, thickening tank, sludge, drawing, discharge, divert, Coriolis

Description

Sludge discharging structure in solid / liquid separator or sludge thickener}

1 is a cross-sectional view of the water purification plant concentration tank is applied sludge discharge structure according to an embodiment of the present invention,

2 is a flow chart of the sludge in the embodiment of FIG.

3 is a cross-sectional view of the water treatment plant concentration tank to which the sludge discharge structure according to another embodiment of the present invention,

4 is a flow chart of the sludge in the embodiment of FIG.

5 is a cross-sectional view showing the structure of a conventional thickening tank,

6 is a cross-sectional view showing another structure of a conventional thickening tank.

* Explanation of symbols for main parts of the drawings

10: thickener 12: hopper

20: sludge drawing pipe 22: drawing pipe entrance

30: sludge 32: hole

34: sludge flow

The present invention relates to the sludge discharge structure of solid-liquid separation and concentration facility, and it is possible to reduce the dewatering cake water content by reducing the dehydration cake water content by reducing the dewatering cake water content by increasing the concentration of drawn sludge in the sewage basin or concentration tank in the water purification plant. The hopper of the sedimentation basin or thickening tank is formed in a circular shape, and a sludge drawing pipe is installed at the bottom of the hopper, but the anti-clockwise direction in the northern hemisphere is caused by the Coriolis effect (turning force). Taking into account the acceleration in the southern hemisphere), the sludge draw pipe is placed in a deflected direction in the direction in which the forward force acts (counterclockwise in the northern hemisphere, and clockwise in the southern hemisphere). To draw effectively without stagnation This is to reduce dehydrator uptime and disposal cost by improving concentration and dehydration efficiency.

The water purification plant for the water supply is supplied to each household after passing through the mixing well and condensation cell in the intake pump station for the intake of raw water, passing through the rapid filter, the chlorine mixing tank and the water purification plant, and the sludge with high moisture content settled in the sedimentation basin. After passing through the sludge support, discharge resin, recovery tank, and distribution tank, it is concentrated in the concentration tank, stored in the storage tank, and processed after the final dehydration process in a separate dehydration facility.

On the other hand, the sludge concentrated in the sedimentation basin and the concentration tank in the water purification plant has a hole (usually called a "rabbit hole") in the place where the sludge escapes when drawn out, and only water flows out through this hole, and the sludge is not discharged. Sludge with high moisture content flows into the dehydrator by leaving only water, resulting in dehydration cake with water content of more than 80%, which is difficult to dispose of, and high disposal costs due to increased water content are placing a heavy burden on facility operation costs at each water purification plant. .

5 and 6 are cross-sectional views illustrating a sludge discharge structure of the thickening tank according to the prior art, respectively, and holes are formed only in the periphery of the sludge drawing pipe 20 installed inside the hopper 12 under the thickening tank 10 as described above. (32) is formed so that only water escapes through this hole, which shows that the sludge 30 having a high water content accumulates in the lower portion of the hopper 12.

In the conventional thickener illustrated in FIGS. 5 and 6, the inlet 22 of the sludge drawing tube 20 is simply located at the center of the bottom of the hopper 12, and the shape of the hopper 12 is also rectangular, so that the sludge of high concentration is formed. As the resistance is received by the inner wall of the hopper 12 in the process of moving to the sludge drawing pipe 20 side, a phenomenon occurs in which deposition occurs and the sludge is not discharged smoothly but has accumulated a problem.

The present invention was devised to solve the above problems in the conventional sedimentation basin and thickening tank, and improved concentration efficiency by allowing the sludge of low concentration of water to be concentrated in the sedimentation basin and thickening tank to be effectively discharged through the sludge drawing pipe without accumulating. It is possible to reduce the cost of sludge disposal by lowering the dehydrated cake moisture content by reducing the dehydrated cake moisture content.

In order to achieve the above object, the present invention forms a hopper of a sedimentation basin and a concentration tank in a circular shape, and installs a sludge drawing tube at the bottom of the hopper, but the sludge with a very low flow rate is affected by the earth's rotation (turning force). By considering the acceleration acting counterclockwise in the northern hemisphere (clockwise in the southern hemisphere), the sludge draw pipe is placed so as to be bent in the direction in which the forward force acts (counterclockwise in the northern hemisphere and clockwise in the southern hemisphere). It provides a sludge drainage structure for sedimentation basins or thickeners in the water purification plant which allows this large sludge to be effectively drawn off without accumulation.

The drawing pipe applied to the present invention is simple to manufacture by installing only one pipe at the bottom of the hopper, and it is effective in improving the operation of the sedimentation basin and improving the water quality of the condensate tank by combining the principle of the simple drawing pipe with the centrifugation principle. As the concentrated sludge is drawn to the dehydrator, the dehydrator operation time is reduced, thereby reducing the electricity bill, and the disposal cost can be reduced by greatly reducing the dehydration cake moisture content.

In addition, the existing thickening tank is for concentrating high concentration of sludge over the residence time, even when concentrating a high concentration of sludge, only the sludge around the drawing pipe flows out when drawing, and a hole is formed in this portion, so that a high concentration of sludge There was a difficulty in cleaning the thickening tank by cycle because it is accumulated and only water is drained, but the present invention can increase the efficiency of operation because such accumulation of sludge does not occur.

Hereinafter, the sludge discharge structure of the sedimentation basin or concentration tank in the water purification plant according to the present invention will be described in more detail with reference to the accompanying drawings.

In the drawings for explaining the present invention will be described with the same reference numerals for the same components as in the prior art.

1 shows the internal structure of the sedimentation basin and the concentration tank in the water purification plant to which the sludge discharge structure according to the present invention is applied, the present invention forms a hopper 12 of the concentration tank 10 in a circular shape, the bottom of the hopper 12 Sludge drawing pipe (20) is installed, but sludge drawing pipe (20) in consideration of the acceleration in the northern hemisphere due to the Coriolis effect (turning force) that the sludge is very slow flow velocity is affected by the Earth's rotation It is installed so as to be bent counterclockwise for the turning force.

The sludge discharge structure of the embodiment shown in FIG. 1 has been described in the case of the northern hemisphere, in which the sludge drawing pipe 20 is arranged to be bent clockwise.

2 is for explaining the state in which the concentrated high-density sludge is discharged through the sludge drawing pipe 20 while rotating in a counterclockwise direction by the turning force, in the northern hemisphere, the sludge concentrated in the sedimentation basin or the concentration tank 10. Is rotated downward counterclockwise along the direction of the arrow, and finally the concentrated sludge is discharged to the outside through the sludge drawing pipe 20 is installed in a bent counterclockwise at the bottom of the hopper 12.

In the present invention, since the sludge in which the sludge drawn pipe 20 is concentrated is disposed along the direction in which the turning force received from the hopper at the bottom of the sedimentation basin or the concentration tank acts, the accumulation of the concentrated sludge can be minimized. The sludge with low water content can be discharged smoothly.

When the sludge discharge structure according to the present invention is applied, first, the concentration of drawn sludge can be increased by five times or more than before. That is, compared with the conventional drawing method, the concentration of drawing sludge is 1%, but the present invention has a very high concentration of drawing sludge as 6.3%.

Second, the dehydration cake disposal cost could be reduced by reducing the dehydration cake moisture content by more than 15%.

Third, the storage capacity of the reservoirs has been reduced to less than 1/5. In other words, the concentration of the drawn sludge is high, the volume of the storage tank storing the drawn sludge is reduced to less than 1/5 than the conventional.

Fourth, operating costs were reduced by reducing the operating time of the dehydrator to less than 1/5. That is, the volume of the drawing sludge is reduced to 1/5 or less, so that the operating time of the dehydrator is also reduced to 1/5 or less than before.

In fact, the results of applying the present invention to the C water purification plant under the applicant's jurisdiction are shown in Table 1 below.

TABLE 1

    division  Concentration (%)    Concentration of drawing sludge (%)  Thickener Inlet Sludge  Thickener Sludge  Prior art  0.18  6  1.03  Headquarters  0.18  6  6.3

As can be seen in Table 1, the analysis of the concentration of the sludge and the inflow sludge of the sludge in the water purification plant was measured by three repeated experiments, the average concentration of the sludge inflow sludge was 0.18% The average concentration of sludge deposited in the lower part was 6%, which was not different from the prior art and the present technology. However, the concentration of the drawn sludge was 6.3%, which was 6.3 times higher than the existing 1.03%. Therefore, the present invention can be seen that a high concentration of sludge drawing is possible.

In addition, the present invention was able to reduce the water content of the dehydrated cake by more than 15% compared with the concentration of the drawn sludge discharged from the conventional thickening tank by increasing the concentration of the drawn sludge, the results are shown in Table 2.

TABLE 2

  division  Solid content (tons / year)  Moisture content (%)   Remarks  Prior art  230  80   25% difference from the prior art  Headquarters  230  65

As can be seen in Table 2, in the case of the C water treatment plant, by reducing the water content by 15%, the disposal cost of the sludge is 30,000 won / ton, and the conventional technology generates 2,300 tons / year, and the present proposal is 657 ton / Years can be generated, reducing the production of 1,476 tons / year. Therefore, the disposal cost can be reduced to 51.4 million won / year. Calculating the amount to be reduced and the disposal cost savings by calculating the amount of sludge produced by Korea's water purification plant, the sludge generated annually by 100,000 tons / year can be reduced to 25,826 tons / year by the proposed method. It is expected to save 19.3 billion won per year. Considering other storage tank capacity and dehydrator uptime, savings will likely increase significantly.

Figure 3 shows another embodiment of the present invention, in the present embodiment, instead of installing the sludge draw tube 20 in the bottom of the hopper 12 in the curved state inlet 22 is the center of the bottom of the hopper 12 Sludge drawing pipe 20 is connected to the drawing pipe inlet 22 and formed to be biased to the left from the center line of the sludge, and as shown in FIG. 4, the sludge downward by the turning force received in the northern hemisphere is anticlockwise. As the sludge descends while rotating in the direction, the sludge is smoothly discharged through the inlet pipe 22 which is disposed to be deflected without being accumulated at the bottom of the hopper 12.

The present invention is not limited only to the embodiment shown in Figs. 1 to 4, the cross-sectional shape, the arrangement position and the bent radius of the sludge drawing pipe may be different depending on the size of each thickening tank.

As described above, the present invention improves dewatering efficiency by increasing the concentration of drawing sludge, and can drastically reduce the disposal cost, and reduces the capacity of the storage tank and the dehydrator operation time by reducing the volume of sludge by the highly concentrated sludge. It can be useful in terms of efficient operation and greatly reduce initial investment.

Claims (2)

In the concentration tank in which the sludge with high moisture content precipitated in the sedimentation basin is introduced and concentrated, The hopper 12 of the condenser 10 is formed in a circular shape, and the sludge drawing pipe 20 is installed on the bottom of the hopper 12, but the sludge of which the flow velocity is very slow is affected by the earth's rotation ( The sludge drawing tube is bent in the direction in which the forward force acts (counterclockwise in the northern hemisphere, clockwise in the southern hemisphere), considering that the acceleration acts counterclockwise in the northern hemisphere (clockwise in the southern hemisphere). Sludge discharge structure of the solid-liquid separation and concentration facility. The method according to claim 1, The inlet 22 of the sludge drawing pipe 20 is sludge discharge structure of the solid-liquid separation and thickening facility, characterized in that formed in the center of the hopper 12 to the outside from the center line.

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