KR101077878B1 - Appartatus for minimizing leakage of sand filer of water purification plant - Google Patents

Abstract

The present invention relates to a device for minimizing the loss of the media contained in the backwash water during the backwash of the water purification plant filter over the overflow wall, formed on the upper side of the overflow wall and as the backwash water proceeds to the top edge of the overflow wall from the water surface And an inclined portion formed to be inclined so as to be shallow in depth, and a deceleration plate disposed in front of the overflow wall so that the backwash water can proceed to the inclined portion before the backwash water reaches the inclined portion of the overflow wall. Since the backwash water is decelerated sufficiently before reaching the overflow wall by the deceleration plate, the media contained in the backwash water may be mixed with the turbidity to minimize the loss beyond the overflow wall. Therefore, it is possible to reduce the failure of the equipment or facilities due to the missing media, it is possible to reduce the number of replenishment of the media. In addition, the amount of discharged water is reduced, which can reduce the number of pump operation and save energy.

Filter paper, water treatment plant, backwash, trap

Description

Filter media filter device for water purification plant {APPARTATUS FOR MINIMIZING LEAKAGE OF SAND FILER OF WATER PURIFICATION PLANT}

The present invention relates to an apparatus for minimizing the loss of the media contained in the backwash water during the backwash of the water purification plant filter over the overflow wall.

Generally, filter paper is the last step in treating raw water in a water purification plant. It is an important facility that must stop producing water immediately after a problem occurs. Steady improvement measures are taken to ensure that this is possible.

In the rapid filtration process, which is mainly used in the water purification process, suspended particles are trapped in the pores of the filter media or blocked or adhered to the particle surface while passing through the filter media layer such as sand to remove the turbidity. As the filtration time increases, the amount of solids detained in the filtrate increases, resulting in less filtration and an increase in head loss. Increasing the head loss, turbidity leakage of effluent, and the set filtration duration, the filtration process is stopped to reverse the flow of water and air to expand and flow the media to remove backwashed solids.

The backwashing step fluidizes the filtration layer by backwashing to separate the suspended matter by media collision, friction, and water shear forces. The amount of backwashing during backwashing is calculated by determining the proper backwashing speed according to the median particle size.Insufficient backwashing cannot completely remove the solids held in the media. If the backwashing speed is too high, the median expansion rate increases. There is a risk of loss. However, even at the proper backwash speed, the filter media still loses the filter media due to structural problems and often causes frequent failures such as air supply and recovery pumps.

The present invention has been made in view of the above point, an object of the present invention to provide a structure that can minimize the loss of the media contained in the backwash.

Another object of the present invention is to minimize the loss of media at a simple and low cost without making major changes or replacements to existing filter paper facilities.

In order to solve the above problems, the present invention discloses a filter paper filter medium blocking device for blocking the filter medium so that the filter medium contained in the backwash water does not exceed the overflow wall. The blocking device is formed on the upper side of the overflow wall and has an inclined portion formed to be inclined so that the depth of the backwash water becomes shallower from the surface as it proceeds to the upper edge of the overflow wall, and the backwash water can proceed to the inclined portion before the backwash water reaches the inclined portion of the overflow wall. And a reduction plate disposed in front of the overflow wall.

As an example related to the present invention, the speed reducing plate is disposed in parallel to the flow wall in front of the overflow wall, the speed reducing plate is formed from the overflow wall so as to form a passage hole through which the media can pass between the speed reduction plate and the flow wall. May be spaced apart.

As an example related to the present invention, the deceleration plate is formed to be parallel to the overflow wall and is fixed to be spaced apart from the overflow wall by a fixing means at a predetermined distance, and is formed to extend in the water direction of the backwash water from the fixed plate portion. It may include a reverse inclined portion formed to be inclined in the opposite direction to the inclined portion of the overflow wall.

As an example related to the present invention, a protrusion formed to protrude in the horizontal direction may be formed on an inner wall of the moon wall. In this case, the inclined portion may form a surface between the upper end of the overflow wall and the upper end of the protrusion.

As an example related to the present invention, a surface connecting the lower end of the protrusion and the overflow wall may be formed to be inclined in the opposite direction to the inclined portion.

As an example related to the present invention, an inlet blocking plate may be further fixed to the protrusion to block backwash water from the filter paper from flowing into the passage hole.

As an example related to the present invention, the inlet blocking plate may be disposed to be inclined downward from the bottom of the protrusion, and may be configured to form a predetermined gap with the fixing plate.

As described above, according to the apparatus for preventing the loss of media of filter water filter paper according to the present invention, since the backwash water is sufficiently decelerated before reaching the overflow wall by the deceleration plate, the media contained in the backwash water are mixed with the turbidity and lost beyond the overflow wall. It can be minimized. Therefore, it is possible to reduce the failure of the equipment or facilities due to the missing media, it is possible to reduce the number of replenishment of the media. In addition, the amount of discharged water is reduced, which can reduce the number of pump operation and save energy.

According to the deceleration plate according to the present invention, it is possible to easily obtain a material that is easy to manufacture, so that not only does not involve excessive change of the basic structure of the filter paper, but also shortens the construction cost and construction period, thereby impeding the waterworks production schedule. There is an advantage not to bring about.

Hereinafter, a filter paper blocking device for filter media according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of a filter paper according to the present invention.

As shown in FIG. 1, the filter paper 1 includes a filtration chamber 11, a water purification plant 13, and a foundation structure 10 for forming a water discharge passage 14.

In the lower part of the filtration chamber 11, a lower water collecting facility 20 for filtering the water introduced from the water inlet 18 of the upper part and sending it to the water purification plant 13 is installed. The lower collection facility 20 supports a filter layer 23 made of sand having various grain sizes, a filter layer 23, and a strainer block for passing the purified water filtered by the filter layer 23. 21), and a sump 24 for collecting the purified water passing through the strainer block 21;

The filter medium layer 23 may include 3 to 4 or more detailed filter layers such that the filter medium having a larger particle size is disposed at the bottom of the strainer block 21 and is disposed to have a smaller particle size toward the top.

The strainer block 21 includes a plurality of through-holes that pass through the purified water passing through the filter medium layer 23 at the time of purified water and pass back water or air at the time of backwashing. The strainer block 21 is formed in a structure capable of protecting the media layer 23, and is firmly fixed to the column or wall so as not to be separated from the base structure 10 by the back pressure during back washing. The strainer block 21 may be formed horizontally as shown in FIG. 1. Alternatively, the strainer block 21 may be formed in a teepee block or other forms.

The lower water collecting facility 20 is formed at both sides with respect to the water discharge passage 14 and the water purification passage 13 which are respectively formed to be separated up and down in the center.

At the time of water purification, raw water introduced into the filtration chamber 11 through the water inlet unit 18 is filtered through the median layer 23 by gravity. In this process, the turbidity contained in the raw water is accumulated in the filter medium layer 23. The raw water sequentially passes through each of the detailed filter layers constituting the filter layer 23 and is collected into the sump 24 through the through hole of the strainer block 21. The purified water of the sump 24 flows to the next stage through the central purified water channel 13.

In backwashing, the backwashing water or air is supplied to the purified water reactor 13 by a pump. That is, when back pressure is applied to the purified water reactor 13, the backwash water flows backward to the sump 24. In each sump 24, the backwash water rises through the strainer block 21. The backwash water passing through the strainer block 21 disturbs the filter layer 23 while passing through the filter layer 23 to separate the suspended solids F fixed to the filter layer 23.

The light media contained together with the turbidity or turbidity separated from the media layer 23 is floated in the water direction along with the backwash flow. The suspended matter F and the filter medium S which floated on the water surface are moved toward the overflow wall 15 by the surface water flow of the inlet portion 18 which forms a flow in the direction of the central waterway.

The mixture of the turbidity F and the media S moved toward the overflow wall 15 flows over the overflow wall 15 in the central conduit 14.

At the upper end of the overflow wall 15, the filter medium blocking device 50 is installed to block the filter medium contained in the backwash water from flowing over the overflow wall 15. Details of the medial oil loss blocking device 50 will be described with reference to FIG. 2. Figure 2 is a cross-sectional view of the filter media filter block device of the filter paper related to the present invention, Figure 3 is an operating state of the filter media filter block device according to the present invention.

According to these drawings, the median loss prevention apparatus 50 includes the inclination part 51 and the reduction plate 60 as a whole.

The inclined portion 51 is formed to be inclined at the upper end of the overflow wall 15 so that the depth of the backwash wall 15 becomes shallower from the water surface as it proceeds to the edge of the upper end of the overflow wall 15. Since the depth becomes shallower toward the upper edge of the overflow wall 15, the depth decreases toward the upper end of the flow velocity near the inclined surface, so that a relatively heavy filter medium S accumulates on the inclined portion 51, and again along the inclined portion 51. 11) Move towards and sink.

The reduction plate 60 is installed in front of the inclined portion 51. The deceleration plate 60 serves to decelerate the backwashing water by allowing the backwashing water to proceed to the inclined portion 51 before the backwashing water reaches the inclined portion 51 of the overflow wall 15.

The reduction plate 60 is disposed in parallel to the overflow wall 15 in front of the overflow wall 15. The reduction plate 60 is disposed to be spaced apart from the overflow wall 15 so that the passage hole 58 may be formed between the reduction plate 60 and the overflow wall 15 so that the filter medium can pass therethrough.

The reduction plate 60 includes a fixed plate portion 61 and an inclined plate portion 62.

The fixed plate portion 61 is formed to be parallel to the overflow wall 15, and is fixed to be spaced apart from the overflow wall 15 by a fixing means 55 such as an anchor bolt.

The inclined plate portion 62 is formed to extend from the fixed plate portion 61 in the water direction of backwashing water. The inclined plate portion 62 is formed to be inclined in a direction opposite to the inclined portion 51 of the overflow wall 15. Accordingly, as shown in FIG. 2, the inclined portion 51 of the overflow wall 15 and the inclined plate portion 62 of the reduction plate 60 become a kind of funnel. The backwashing water over the reduction plate 60 is significantly reduced in the flow velocity in the space between the inclined portion 51 and the inclined plate portion 62, and the media (S) included in the backwashing water sinks downward by its weight. . The collected media is moved downward through the passage hole 58 and is again accumulated in the media layer 23.

The upper portion of the inner wall of the overflow wall 15 is formed with a protrusion 16 formed to protrude in the horizontal direction. In other words, the portion where the reduction plate 60 is mounted on the overflow wall 15 protrudes in the inner direction of the filtration chamber 11 to have a thicker thickness than the other portions.

The inclined portion 51 forms a surface between the upper end of the overflow wall 15 and the upper end of the protrusion 16.

The surface 53 connecting the lower end of the protrusion 16 and the overflow wall 15 is inclined in the opposite direction to the inclined portion 51. The inclination of the surface 53 prevents the flow of backwash coming from the bottom to hinder the flow of backwash from the water surface toward the overflow wall and guides the flow back to the inside of the filtration chamber 11. do.

An inflow blocking plate 70 is fixed to the protruding portion 16 to block backwash water from the filter paper 1 from flowing into the passage hole 58. The inflow blocking plate 70 is disposed to be inclined downward from the lower end of the protrusion 16. However, the inflow blocking plate 70 is configured to form the fixed plate portion 61 and the predetermined gap 71.

The reduction plate 60 and the inflow blocking plate 70 may be manufactured by a method such as bending or bonding a plate which is not rusted, such as stainless steel. The reduction plate 60 and the inflow blocking plate 70 may be manufactured in one piece to obtain a cost reduction effect.

4 to 8 are cross-sectional views showing another example of the speed reducing plate and the inlet blocking plate according to the present invention.

FIG. 4 shows that the inclined plate portion 62 as shown in FIG. 3 is not formed on the reduction plate 60 and is formed in a straight line in the vertical direction.

5 shows that the inclined plate portion 63 of the reduction plate 60 is bent in the same direction as the inclined portion 51 of the overflow wall 15. In this case, the backwash may primarily sink the media while the backwash is over the top of the speed reducer 60, and the backwash over the speed reducer 60 is again secondary by the inclined portion 51 of the overflow wall 15. You can sink the media.

6 and 7 show that the inclined plate portions 64 and 65 of the reduction plate 60 are formed in a round shape.

8 shows that the inclined plate portion 62 of the reduction plate 60 further extends to further have an inclined portion 66 having the same inclination as the inclined portion of the overflow wall 15. As a result, the media contained in the backwash can obtain a greater deceleration effect.

As described above with reference to the drawings illustrating an apparatus for preventing the filter medium outflow of water purification filter according to the present invention, the present invention is not limited by the embodiments and drawings disclosed herein, the scope of the technical idea of the present invention Various modifications can be made by those skilled in the art.

1 is a cross-sectional view of the filter paper according to the present invention.

Figure 2 is a cross-sectional view of the filter media filter device of the filter paper related to the present invention

Figure 3 is an operating state of the filter medium loss device related to the present invention

4 to 8 are cross-sectional views showing another example of the reduction plate and the inlet blocking plate associated with the present invention

Claims (7)

In the filter media filter chamber blocking device for blocking the filter medium so that the filter medium contained in the backwash water does not exceed the overflow wall, the blocking device, An inclined portion formed at an upper end of the overflow wall, the inclined portion being inclined so that the depth is shallow from the water surface as the backwash water proceeds to the upper edge of the overflow wall; And Before the backwash water reaches the inclined portion of the overflow wall, the backwash water is disposed in parallel to the front of the overflow wall so that it can proceed to the inclined portion, and a passage hole through which the filter medium can pass between the overflow wall. It includes a reduction plate disposed to be spaced apart from the overflow wall, the reduction plate, A fixed plate part formed to be parallel to the moon wall and fixed to be spaced apart from the moon wall by a fixing means at a predetermined distance; And The filter paper media barrier room blocking device is formed to extend from the fixed plate portion in the water direction of the backwash water, the inclined plate portion is formed to be inclined in the same or opposite direction to the inclined portion of the overflow wall. delete delete The method of claim 1, Protruding portion is formed to protrude in the horizontal direction on the inner wall of the overflow wall is formed, wherein the inclined portion forms a surface connecting the upper end of the overflow wall and the upper end of the protrusion wall filter device. 5. The method of claim 4, Surface interposed between the lower end of the protruding portion and the overflow wall is inclined in the opposite direction to the inclined portion formed filter media blocking device. The method of claim 5, The filter paper media loss block device, characterized in that the inlet blocking plate for further preventing the backwash water of the filter paper to be introduced into the passage hole. The method of claim 6, The inlet blocking plate is disposed obliquely downward from the lower end of the protrusion, media filter loss blocking device, characterized in that configured to form a predetermined gap with the fixing plate.

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