KR100725597B1 - Strainer with back washing air venting holes, and biological filter with the same - Google Patents

Abstract

A strainer with a backwashing air venthole which enables backwashing of water and air at the same time by complementing demerits of a conventional strainer, and a bio-film filtering device employing the strainer are provided. In a strainer(100) for a bio-film filtering device in which backwashing water moves downward during backwashing, the strainer has an air venthole(130) providing a passage through which backwashing air moves upward to enable backwashing of water and air at the same time by exhausting the backwashing air through the air venthole during backwashing in a state that the backwashing air is not collided with the backwashing water. The strainer comprises an outer strainer(121) fixed to a strainer block, and an inner strainer(122) fixed to an inner side of the outer strainer such that the backwashing water moves downward, wherein the air venthole(130) is formed in the outer strainer.

Description

Strainer with backwash air outlet and biofilm filtration device employing same {Strainer with back washing air venting holes, and Biological filter with the same}

1 is a schematic view of a conventional biofilm filtration device

FIG. 2 is a view illustrating a media expansion state according to backwash water inflow of the biofilm filtration apparatus of FIG. 1; FIG.

Figure 3 is a view showing the inlet air inlet state of the biofilm filtration device of Figure 1

4 is a schematic view of the strainer and strainer block of FIG.

5 is a conceptual view of the treatment water and process air discharge of the strainer in FIG.

6 is a conceptual view of backwash water inflow of the strainer in FIG. 4.

7 is a conceptual view of the strainer back-air outflow in FIG.

FIG. 8 is a conceptual diagram illustrating movement of backwashing air and backwashing water at the same time of water and air backwashing of the strainer in FIG.

9 is a side cross-sectional view of the strainer according to the first embodiment of the present invention.

10 is an enlarged partial view of FIG.

11 is a side cross-sectional view of a strainer according to a second embodiment of the present invention.

FIG. 12 is a view showing a part of the upflow floating biofilm filtration apparatus according to the present invention showing a state in which each strainer of FIGS. 9 and 11 is installed in a strainer block.

FIG. 13 is a conceptual view illustrating movement of backwash air and backwash water in the biofilm filtration device of FIG. 12.

The present invention relates to a strainer used in an upflow floating biofilm filtration device, and a biofilm filtration device employing such a strainer.

Upflow biofilm filtration process using floating media (specific gravity <1) is a sewage and wastewater treatment process that combines physical filtration and biological treatment functions. It is a unit processor that can. As shown in FIG. 1, the upflow biofilm filtration apparatus includes a media zone 1 through which microorganisms are attached and grown and a solid is filtered, a strainer 2 for preventing the outflow of media, and microorganisms attached to the media. Air supply device (3) for supplying oxygen to the back, and back-air air inlet device (4) for backwashing microorganisms and filtered solids grown in the media.

In the case of the biofilm filtration process, head-loss occurs due to the increase of solids (microorganisms + solids) in the media as the filtration and biological treatment proceed. Maintain functionality. The backwashing method blocks the influent, supplies the backwashing water from the top, expands the filter medium by opening the backwash valve (FIG. 2), and generates a turbulent flow in the expansion filter to remove the solids attached to the filter medium. (FIG. 3), and the step (FIG. 2) for flowing out the solids detached from the media is repeated.

The most efficient method of backwashing of the upflow biofilm filtration process is to backwash by injecting backwashing water and backwashing at the same time. Because. In the case of staged backwashing, in which the backwashing air is injected after the supply of backwashing water is terminated, supply of backwashing air does not lead to efficient disturbance of the media because the backwash is returned to its original position due to buoyancy. (See Figure 3). Despite the advantages of simultaneous water + air backwashing, it is impossible to perform air + water backwashing with existing strainers. This is because when the air + water simultaneous backwash is performed, the upstream air and the downstream backwash water must pass simultaneously through the strainer 2 because water and air cannot pass through the same space at the same time.

4 is a view showing the structure of a conventional strainer 2 employed in FIG. The structure of the strainer is composed of an outer strainer 21 attached to the strainer block 20 and an inner strainer 22 that prevents the outflow of the media and discharges the treated water. During the process, the process air and the treated water proceed in the same direction (upstream) and are smoothly discharged through the strainer 2 (FIG. 5). When the backwash is started, the backwash water flows in the downward direction through the strainer 2 while the inflow water is blocked for the first step of expansion of the medium (FIG. 6). In the second step, the backwash air is injected and proceeds to the upstream, disturbing the filter medium and discharged through the strainer 2 (FIG. 7). When water + air simultaneous backwashing with backwashing air for disturbance is performed while the media is inflated, a collision occurs because the upstream backwashing air and the downstream backwashing water must pass through the strainer at the same time (FIG. 8). . In general, backwash air is supplied at 1.5 to 2 times the process air, so if the backwash air passes through the strainer, the backwash water cannot pass. If backwashing continues without supplying backwash water, a significant problem arises due to the lack of backwash water, which causes the filter media to flow out and the biofilm filtration process cannot function. As described above, the conventional strainer 2 has a weak point that air and water simultaneous backwashing, which is the most effective backwashing method, cannot be performed.

The present invention has been made to solve the above problems, an object of the present invention to compensate for the weakness of the conventional strainer to enable simultaneous backwashing of water and air.

In order to achieve the above object, the present invention provides an air outlet for providing a passage through which the backwashing air is moved upwards so that the backwashing air is discharged through the air outlet without colliding with the backwashing water during backwashing. A strainer for an upflow floating biofilm filtration device, characterized by simultaneous backwashing, is proposed.

Here, the strainer is configured to include an outer strainer is fixed to the strainer block, and the inner strainer is fixed to the inside of the outer strainer and the backwash water is moved downward, wherein the air outlet is formed in the outer strainer Preferably, it may also be formed in the inner strainer.

According to another aspect of the invention, the strainer having a configuration of the air outlet as described above; And a strainer block to which the strainer is fixed. The upflow floating biofilm filtration apparatus is provided.

At this time, the strainer block, it is preferable that the lower surface of the adjacent region of the position where the strainer is disposed recessed upward.

In addition, the plurality of strainers are configured such that their lengths in the vertical direction are different, and in this case, it is preferable that the strainers are alternately arranged that the length of the strainers is relatively large and relatively small.

According to the present invention, since such air + water simultaneous backwashing is enabled in the upflow biofilm filtration process using floating media, it is possible to significantly reduce backwashing time, backwashing air, and backwashing time as well as efficient backwashing. have.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention. In the description of the embodiment of the present invention, the basic configuration of the conventional upflow floating wastewater treatment apparatus shown in FIG. 1 is referred to as a component of the present invention, and a detailed description thereof is omitted.

9 is a side cross-sectional view of the strainer according to the first embodiment of the present invention, and FIG. 10 is a partially enlarged view of FIG. 9. Strainer 100 is composed of an outer strainer 121 and the inner strainer 122, the outer strainer 121 is fixed to the strainer block 300 (see Fig. 11) and the inner strainer 122 is an outer strainer 121 Is fixed to.

The outer strainer 121 is provided with an air outlet 130 for discharging backwash air. More specifically, the air outlet 130 is opened downward in the space spaced from the outer surface of the inner strainer 121 to the lower side of the inner side of the outer strainer 121 and upwardly opened to the upper surface of the outer strainer 121. The lower space of the strainer 100 communicates with the upper space of the strainer 100. Accordingly, the back air supplied to the lower portion of the strainer 100 may be discharged to the upper portion of the strainer 100 through the air outlet 130. The shape, arrangement and number of the air outlet 130 may be variously changed.

11 is a side cross-sectional view of the strainer 200 according to the second embodiment of the present invention.

In this embodiment, the length of the strainer 200 in the vertical direction is shorter by about 10 cm than in the above-described first embodiment. The strainer 200 is composed of an outer strainer 221 and an inner strainer 222, and the air outlet 230 is formed in the outer strainer 221 is the same as the first embodiment described above.

12 is a view showing a portion of the upflow floating biofilm filtration apparatus according to the present invention showing a state in which the strainers 100 and 200 of FIGS. 9 and 11 are installed in the strainer block 300, and FIG. A conceptual diagram of the movement of backwash air and backwash water in the biofilm filtration device of FIG. 12.

In the upflow floating biofilm filtration apparatus of the present invention, a plurality of strainers are configured to be disposed in the strainer block 300, wherein the length of the strainer 100 of the first embodiment is relatively small and its length is relatively small. The strainer 200 of the second embodiment is alternately arranged in the strainer block 300.

In addition, the strainer block 300 includes a recess 300a in which a lower surface of an adjacent region of the position where the strainers 100 and 200 are disposed is recessed upward.

As shown in FIG. 13, the backwash air is discharged upward from the bottom of the strainer block 300 through the air outlets 130 and 230 of the outer strainers 121 and 221, and the backwash water is discharged from the inner strainers 122 and 222. It is discharged downward from the top of the strainer block 300 through. At this time, since the recess 300a of the lower surface of the strainer block 300 forms a space spaced upwardly from the water surface of the backwashing water as shown in FIG. 13 when the backwashing water and the backwashing air are simultaneously introduced, the backwashing air is an air outlet ( 130, 230 may be smoothly discharged. That is, the back air is collected through the air outlets 130 and 230 of the external strainers 121 and 221 after the back air is collected in the depression 300 under the strainer block 300 because the lift force is high. Is introduced through the internal strainers 122 and 222.

In addition, by arranging the long strainer 100 and the short strainer 200 together, the back strainer 200 is mainly air discharged during backwashing, and the long strainer 100 is mainly supplied with backwash water to simultaneously pass backwash water and backwash air. Can be made smoothly.

According to the present invention, air + water simultaneous backwashing is possible in the upflow biofilm filtration process using flotation media. As air and water are introduced and discharged into different spaces as described above, collisions do not occur and air and water simultaneous backwashing are possible. Therefore, since the backwash air is supplied in the expanded state by the backwash, efficient turbulence is generated and the flow of the backwash occurs smoothly so that backwashing is effectively performed.

The simultaneous air and water backwashing is possible in the upflow biofilm filtration process using floating media, which can reduce backwash time, backwash air, and backwash water consumption to 50% or less. .

In the above, the preferred embodiment of the present invention has been illustrated and described, but the present invention is not limited to the specific embodiments described above, and the technical spirit of the present invention and the following by those skilled in the art to which the present invention pertains. Various modifications and variations will be possible within the scope of equivalents of the claims to be described therein, and such variations will fall within the protection scope of the present invention.

Claims (8)

In the strainer for biofilm filtration device that the backwash water is moved downward during backwashing, And an air outlet for providing a passage through which the backwashing air is moved upward, so that the backwashing air is discharged through the air outlet without colliding with the backwashing water during backwashing so that water and air can be backwashed simultaneously. The method of claim 1, The strainer includes an outer strainer fixed to the strainer block, and an inner strainer fixed inside the outer strainer to move the backwash water downward. The air outlet is formed in the outer strainer strainer. A strainer capable of simultaneously backwashing water and air by providing an air outlet for providing a passage through which the backwashing air is moved upwards, through which the backwashing air is discharged through the air outlet without colliding with the backwashing water; And A strainer block to which the strainer is fixed; Upflow floating biofilm filtration device comprising a. The method of claim 3, wherein The strainer includes an external strainer fixed to the strainer block, and an inner strainer fixed inside the outer strainer to move the backwash water downward. The method of claim 4, wherein The air outlet is an upflow floating biofilm filtration device, characterized in that formed on the outer strainer. The method according to any one of claims 3 to 5, The strainer block is an upflow floating biofilm filtration device, characterized in that the lower surface of the adjacent region of the position where the strainer is disposed is recessed upward. The method according to any one of claims 3 to 5, The strainer is provided with a plurality of the strainer, The strainers are upstream floating biofilm filtering device, characterized in that the length in the vertical direction is different. The method of claim 7, wherein The strainers are upstream floating biofilm filtering device characterized in that the alternating arrangement of the relatively long and relatively small in length in the up and down direction.

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