KR102561960B1 - Weir watering type trickling filter - Google Patents

Abstract

The present invention relates to a watersprinkling filter bed in which pollutants are adsorbed and oxidized while passing through a granular filter medium, in which wastewater to be treated is purified. It is composed of a granular filter medium 91 and a fine filter medium 92 of the lower layer, but an overflow type water supply path 50 is formed at the upper end of the side wall 14 of the treatment tank, while completely excluding the watering pipe at the top of the treatment tank. This is to ensure smooth penetration and diffusion of water.
Through the present invention, it is possible to configure the upper part of the treatment tank on the watering filter in a completely open state, and to operate the watering filtering bed in an appropriately wet state without water surface formation, while uniformly and smoothly spreading the treated water in the filter media. It can be induced, so the performance and utilization of the trickling filter bed can be improved.

Description

Overwater watering type trickling filter {WEIR WATERING TYPE TRICKLING FILTER}

The present invention relates to a watersprinkling filter bed in which pollutants are adsorbed and oxidized while passing through a granular filter medium, in which wastewater to be treated is purified. It is composed of a granular filter medium 91 and a fine filter medium 92 of the lower layer, but an overflow type water supply path 50 is formed at the upper end of the side wall 14 of the treatment tank, while completely excluding the watering pipe at the top of the treatment tank. This is to ensure smooth penetration and diffusion of water.

As a representative biochemical treatment facility, the trickling filtration bed is used as a sewage purification treatment facility as well as a purification treatment facility for sewage and wastewater discharged from various pollutant discharge facilities such as industrial facilities or livestock farming facilities.

As in its dictionary meaning, the water trickling filter phase is purified by decomposing organic matter in the treated water by microorganisms attached to the surface of the filter medium while the treated water passes through the filter medium layer loaded in the tank, and the contaminants are adsorbed and filtered on the filter medium. A watering facility is provided at the top of the treatment tank, or the treatment tank is completely filled with treated water and is operated so that the water surface is formed at all times.

Conventional trickling filtration beds, including Patent No. 2020849 and Patent Publication No. 2009-101564, have the same basic structure that induces the passage of treated water through the filter media, and therefore, to promote wide diffusion of the treated water to the entire filter media loaded in the treatment tank. Means for this need to be devised.

That is, when the treated water is concentrated on a part of the filter media in the treatment tank, the treatment efficiency of the entire trickling filtration bed is lowered, and since the filter media needs to be frequently replaced, the contaminated treated water needs to be smoothly diffused in the inner space of the treatment tank. .

Accordingly, as a means for inducing smooth diffusion of polluted treated water in a conventional watering filter bed, a complicated watering pipe is installed on the top of the treatment tank as in Patent No. 2020849 or a treatment tank as in Patent Publication No. 2009-101564. It is operated so that the water surface is always formed on the upper floor.

However, apart from the aesthetics, the watering pipe at the top of the treatment tank not only costs a lot to install, but also causes clogging of the pipe from time to time in the process of transporting contaminated treated water, resulting in insufficient effectiveness and causing considerable difficulties in maintenance. However, in the case of the method of operating the treatment tank to form the water surface, the filter medium is inevitably completely submerged at all times, so it is fundamentally impossible to provide sufficient air contact necessary for oxidation of organic matter, and the utilization of the upper space of the treatment tank is extremely limited. .

The present invention was devised in view of the above-mentioned problems, and in the water trickling filtration bed, a perforated pipe in the longitudinal direction inside the rectangular treatment tank formed by the bottom plate 11, the front wall 12, the rear wall 13 and the side wall 14 21 is installed, and a collection chamber 30 to which the discharge pipe 31 is connected is formed outside the rear wall 13, and one end of the perforated pipe 21 penetrates the rear wall 13 to enter the collection chamber 30. , and at the upper ends of both side walls 14, water supply passages 50 protruding toward the center of the treatment tank are formed, and an overflow wall 51 is formed upright at the other end of the side wall 14 of the water supply passage 50, , Inside the treatment tank, the upper granulated filter medium 91 and the lower layer fine-grained filter medium 92 are laid and stacked, and a V-shaped cross-sectional boundary is formed between the granulated filter medium 91 and the fine-grained filter medium 92, so that the inlet pipe ( After the treated water supplied through 41) overflows along the overflow wall 51 of the water supply channel 50 and is injected into the upper part of the granulated filter medium 91, the treated water flows down while passing through the granulated filter medium 91 formed with a slope on the lower boundary surface. At the same time, it is discharged downward and spreads and penetrates into the fine filter medium (92).

In addition, in the present invention, a water collecting path 60 protruding toward the center of the treatment tank is formed at the lower portion of the water supply path 50, and a water collecting wall 61 is formed standing at the other end of the side wall 14 of the water collecting path 60. A discharge pipe 67 penetrating the rear wall 13 is installed to connect the water collection channel 60 and the water collection chamber 30, and the washing water pressurized and injected through the perforated pipe 21 passes through the fine filter media 92 and the assembled filter media. After passing through (91), the water overflows the water collection wall (61), flows into the water collection channel (60), and is returned to the water collection room (30) through the discharge pipe (67).

Through the present invention, it is possible to configure the upper part of the treatment tank on the watering filter in a completely open state, and to operate the watering filtering bed in an appropriately wet state without water surface formation, while uniformly and smoothly spreading the treated water in the filter media. It can be induced, and the performance and utilization of the trickling filter bed can be improved.

In particular, since the piping at the top of the treatment tank can be completely excluded, the maintenance convenience of the trickling filtration bed can be improved and aesthetics can be secured, as well as the free use of the upper space of the trickling filtration bed such as vegetation formation or installation of facilities. this is possible

In addition, since it can be operated without forming a water surface in the upper part of the open treatment tank, the sprinkling filtration bed can be used for walking trails or parks.

1 is a perspective view of the present invention
Figure 2 is an explanatory diagram of the filter media layering method of the present invention
Figure 3 is a perspective view of the structure of the present invention
Figure 4 is a partially cut perspective view of the structure of the present invention
5 is a cross-sectional view of the present invention
6 is a longitudinal cross-sectional view of the present invention
7 is an explanatory diagram of the backwashing method of the present invention
Figure 8 is an explanatory diagram of the manufacturing process of the granulated filter medium of the present invention

The detailed configuration and operation method of the present invention will be described through the accompanying drawings.

First, FIG. 1 shows the appearance of the water trickling filtration bed of the present invention. As shown, the present invention is a facility in which a water collection chamber 30 is configured at the rear end of a treatment tank, which is a rectangular water tank, and the treated water purified through the filter medium Water is collected in the collection room 30 and then discharged to the outside.

As shown in FIGS. 2 to 6, the detailed structure of the facility of the trickling filter bed to which the present invention is applied is basically a filter media loading treatment tank, and as shown in these drawings, the upper part of the treatment tank of the present invention is essentially required in the prior art. Complex watering pipes are completely excluded, and in the prior art, the water surface, which always needed to be formed on the upper side of the filter media in the treatment tank for filter bed operation, does not need to be formed.

Therefore, it is not only possible to freely utilize the space above the treated water, but also to secure the aesthetics, which is advantageous in securing the site during facility planning and construction. can also be done

Looking at the facility structure of the water trickling filter of the present invention, as shown in FIGS. Sidewalls 14 are formed at both ends of ), so that a rectangular treatment tank in which the distance between the front and rear ends of the bottom plate 11 on a plane is greater than the distance between both side ends is constructed, and as shown in FIG. 4, the bottom plate 11 inside the treatment tank ) On the upper surface, a perforated pipe 21 is installed in the longitudinal direction of the treatment tank.

In addition, as in FIGS. 1 to 4, a collection chamber 30 to which the discharge pipe 31 is connected is formed outside the rear wall 13, and as shown in FIG. 4, one end of the perforated pipe 21 is the rear wall 13 ) and is connected to the inside of the collection chamber 30.

The treatment tank of the present invention may have a type in which the entire structure is exposed by being built on the ground, and only a part of the upper part of the treatment tank is exposed to the ground, and most of the structures including the bottom plate 11 and both side walls 14 are underground. It may have a form buried in .

As shown in FIGS. 4 and 5, a water supply passage 50 protruding toward the center of the treatment tank is formed at the upper end of each side wall 14 on both sides, and an overflow wall 51 is formed at the other end of the side wall 14 of the water supply passage 50. ) is formed upright, and a stationary continuous concave-convex portion is formed at the top of the overflow wall 51.

That is, the water supply passage 50 of the present invention is a waterway-type structure in which contaminated treatment water is supplied and treated water is supplied to the filter media, and basically has an L-shaped cross section and the side wall 14 has an L-shaped cross section water supply passage 50 It is joined to form a waterway with a U-shaped cross section as a whole, but the wall at the center of the treatment tank is configured as an overflow wall 51, and the treated water transferred through the water supply channel 50 overflows along the overflow wall 51 for treatment. A wide range of water supply is performed for the entire section in the vertical direction on the plane of the filter media loaded in the tank.

In addition, as shown in FIG. 4, the overflow wall 51 of the water supply channel 50 is a labyrinth wall, that is, a stationary continuous irregularity is formed to form a structure in which the overflow water flow is multi-divided, thereby promoting smooth overflow and At the same time, it is possible to prevent the overflow water flow from being biased in some sections of the entire section of the overflow wall 51.

That is, the entire longitudinal section of the treatment tank of the labyrinth overflow wall 51 was constructed so that a wide range of simultaneous water supply to the entire section on the end of the treatment tank was possible while omitting the pipe-type sprinkler equipment required in the normal watering filter bed, This is accompanied by an inclined surface laminated structure of the granulated filter media 91 to be described later, and performs a wide range of homogeneous diffusion function of the treated water.

As shown in FIGS. 1 to 6 , in the supply of treated water to the water supply line 50, the inlet pipe 41 and the water supply line 50 are connected, and the contaminated treated water discharged from the inlet pipe 41 is supplied to the water supply ( 50).

As shown in FIGS. 5 and 6, the treated water sprayed to the top of the treatment tank along the overflow wall 51 of the water supply passage 50 is first injected and penetrated into the granulated filter media 91 installed on the top of the treatment tank, and then After penetrating into the fine filter medium 92 laid and loaded in the lower part of the treatment tank, contaminants are adsorbed and removed, and then introduced into the perforated pipe 21 at the center of the lower part of the treatment tank.

In the present invention, the granular filter medium 91 and the fine filter medium 92 refer to a filter medium having a relatively large particle diameter and a filter medium having a relatively small particle diameter, as in the dictionary meaning, and the fine filter medium 92 is a conventional watering filter medium. The soil to be utilized may be applied, and as the granular filter medium 91, a granular material of coarse quality specialized in the present invention is applied.

That is, as the granular material constituting the granulated filter medium 91 in the present invention, granular material having a particle diameter of 5 mm to 10 mm is applied, and as a specific material, crushed natural stone or calcined porous spheres may be applied. .

In the particle diameter range of the granulated filter medium 91, when the particle diameter of the granulated filter medium 91 is of a fine quality of less than 5 mm, the smooth flow of the treated water is suppressed, and the rapid transfer and wide downward discharge action described later are inevitably reduced, When the particle diameter of the granulated filter media 91 exceeds 10 mm, the treated water is directly discharged without sufficiently passing through the gaps between the granulated filter media 91, and this may also act as a factor deteriorating the downward discharge action over a wide range, which will be described later.

In particular, when the particle diameter of the granulated filter medium 91 is too small, the granulated filter medium 91 performs the function of the fine filter medium 92 that actually performs the filter bed treatment, and contaminants are excessively adsorbed on the granulated filter medium 91. This may shorten the usable life of the granulated filter medium 91 and cause frequent replacement of the granulated filter medium 91.

As shown in FIGS. 2 and 5, the granulated filter medium 91 is not simply horizontally stacked and laid on the upper layer of the fine-grain filter medium 92, but the cross section of the granulated filter medium 91 layer has a smooth upper surface and a V-shaped lower part. As a result, rapid flow of treated water and smooth downward discharge over a wide range can be performed in the layer of the granulated filter medium 91.

That is, the upper granulated filter medium 91 and the lower fine-grain filter medium 92 are laid and stacked inside the treatment tank, and a V-shaped cross-sectional boundary is formed between the granulated filter medium 91 and the fine-grain filter medium 92, so that the treated water After the flow overflows along the overflow wall 51 of the water supply channel 50 and is introduced to the top of the granulated filter medium 91, the treated water flows down and is discharged downward while passing through the granulated filter medium 91 formed with a slope on the lower boundary surface. (92) to diffuse penetration.

As a result, as shown in FIG. 5, even though the first supply of the treated water is limited to the upper side of the treatment tank, the treated water quickly passes through the laminated filter media 91 forming the inclined surface and is accompanied by downward discharge. By performing this, the treated water can be widely diffused and penetrated into the entire area of the loading part of the fine filter medium 92, which occupies most of the area on the cross section of the treatment tank, so that the treatment can be performed without measures such as the above-mentioned prior art watersprinkling pipe or formation of the upper water surface. It is possible to ensure smooth and uniform diffusion of water and excellent treatment efficiency.

In this way, the treated water from which contaminants are removed while extensively contacting the fine filter medium 92 flows into the perforated pipe 21, and then is collected and stored in the collection chamber 30 as shown in FIG. 6, and is stored in the collection chamber 30 The accumulated purified water is finally discharged to the outside through the discharge pipe 31 .

Meanwhile, FIG. 7 illustrates a situation in which backwashing of the filter media is performed in the present invention, whereby contaminants adsorbed or remaining in the pores between the filter media and eroding the filtration performance of the filter media are effectively removed without replacing the filter media. removed, and the performance of the filter bed can be restored.

As shown in FIGS. 4 to 7, a water collecting path 60 protruding toward the center of the treatment tank is formed at the lower portion of the water supply path 50, and a water collecting wall 61 is formed at the other end of the side wall 14 of the water collecting path 60. This standing formation is performed to collect and collect the washing water injected during backwashing. As shown in FIG. 7, forming the upper surface of the assembled filter medium 91 to coincide with the upper end of the water collecting wall 61 performs backwashing. advantageous in

In addition, as shown in FIG. 4, a discharge pipe 67 penetrating the rear wall 13 is installed to connect the water collection channel 60 and the water collection chamber 30, whereby the washing water pressurized and injected into the perforated pipe 21 becomes fine. After passing through the filter media 92 and the assembled filter media 91, it overflows the water collecting wall 61, flows into the water collecting channel 60, and can be returned to the collecting chamber 30 through the discharge pipe 67.

In the treatment tank of the present invention, the backwashing operation first closes both the inlet pipe 41 and the discharge pipe 31 of the collecting chamber 30 to stop the operation of the treatment tank, and then the perforated pipe inside the collecting chamber 30 ( 21) It can be performed by connecting a pressure-resistant hose to the end, injecting washing water from the outside, and recovering and removing the washing water after washing the filter media as it is discharged to the collection chamber 30 through the discharge pipe 67. .

Meanwhile, FIG. 8 shows a manufacturing process of the granulated filter medium 91 of the present invention. As described above, the granulated filter medium 91 of the present invention is a spherical particle having a particle diameter of 5 mm to 10 mm, and has internal porosity. It not only serves as a flow path for treated water, but also has a function of adsorbing contaminants.

The characteristics required for the granulated filter medium 91 of the present invention include maintaining a spherical shape for a long time and maintaining flatness of the surface, ensuring a smooth flow of treated water between pores while securing a contact area for treated water, and It can be said to secure a high degree of strength required for the exposed structure, and these characteristics are difficult to express in conventional artificial porous granular materials that are foam-molded as well as conventional natural porous granular materials such as volcanic stone.

Therefore, in the present invention, the clay is molded into a sphere and fired, but fine wood powder is pre-mixed, and wood powder is burned and lost during the firing process, so that the tissue porosity is good and the strength is excellent. and produced spherical granular bodies with surface flatness maintained for a long period of time.

As shown in FIG. 8, the manufacturing process of the granulated filter medium 91 of the present invention begins with the step of forming a paste by mixing clay, wood flour and water. It is advantageous in homogeneous mixing of wood flour and clay to process wood flour and clay in a manner in which water is added after sufficiently pre-mixing in a dry powder state.

The paste, which is a mixture of wood flour, clay, and water, is put into a mold, compressed, formed into a sphere, and then dried. Then, the dried molded body is fired in an electric furnace at around 1,000° C. for 6 hours to obtain the granulated filter medium 91 of the present invention. It is completed.

11: bottom plate
12: front wall
13: posterior wall
14: side wall
21: perforated pipe
30: collection room
31: discharge pipe
41: inlet pipe
50: water supply
51: overflow wall
60: catchment
61: catchment wall
67: discharge pipe
91: assembly filter
92: fine filter media

Claims (2)

In the trickling filtration bed,
A perforated pipe 21 is installed in the longitudinal direction inside the rectangular treatment tank formed by the bottom plate 11, the front wall 12, the rear wall 13 and the side wall 14;
On the outside of the rear wall 13, a collection chamber 30 to which the discharge pipe 31 is connected is formed;
One end of the perforated pipe 21 passes through the rear wall 13 and is connected to the inside of the collecting chamber 30;
An L-shaped cross section protruding toward the center of the treatment tank is formed at the upper end of the side walls 14 on both sides, and an overflow wall 51 is formed upright at the other end of the side wall 14 of the water supply passage 50. , while the treated water transferred to the water supply passage 50 overflows along the overflow wall 51, water is supplied to the entire section in the vertical direction on the plane of the treatment tank;
Inside the treatment tank, an upper layer of granulated filter media 91 and a lower layer of fine-grained filter media 92 are laid and stacked, and the granulated filter media 91 is a granular material with a particle size of 5 mm to 10 mm, and a paste of clay, wood flour and water is mixed in a spherical shape. It is produced by firing in an electric furnace after molding and drying, and the fine-grain filter medium 92 is soil with a smaller particle diameter than the coarse-grained filter medium 91, and the interface of the V-shaped cross section between the granulated filter medium 91 and the fine-grained filter medium 92 is formed. Formed, the treated water supplied through the inlet pipe 41 overflows along the overflow wall 51 of the water supply channel 50 and is injected into the upper part of the granulated filter medium 91, and then the granulated filter medium 91 with a slope formed on the lower boundary surface An overflow water type sprinkler filter bed, characterized in that the treated water flows down and is discharged downward at the same time as it passes through, and diffuses and penetrates into the fine filter medium (92). delete

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