KR100978071B1 - Filtraion apparatus having ss filtering type and backwash-water discharge type - Google Patents

Abstract

PURPOSE: A filtering device is provided to have super high speed filtering functionality and backfresh function by preventing various kinds of contaminants from flowing into the water and remarkably improving filtering performance. CONSTITUTION: A filtering device equipped with super high speed filtering functionality and backfresh function includes a floc forming bath(10), a filter tub(20), a blasting part for backwashing, and a sludge thickener(30). A guide tube(11) passes through the sidewall of the filter tub from the floc forming bath. An exhaust line(260) includes an upper discharge pipe(220) arranged on the first screen and a bottom outlet(270) arranged under the second screen. The contaminated water transferred to the guide tube is filtered through the porosity floating member and discharge the processing water to the upper discharge pipe.

Description

Filtration apparatus having SS filtering type and backwash-water discharge type

The present invention not only can more efficiently process suspended solids (SS) and total phosphorus (TP) present in the sewage, but also has an ultra-fast filtration function that can quickly optimize the treatment efficiency to be degraded with use. It relates to a filtration device having a backwashing function.

In general, water, sewage, wastewater, and stormwater contain various pollutants and phosphorus, and phosphorus loads from such sewage are very high.

In the conventional sewage treatment apparatus, in order to separate suspended solids and solids from sewage, the sewage is spirally vortexed in a spiral manner and centrifuged or dropped to the bottom through gravity to separate the sewage.

As described above, the conventional sewage treatment apparatus that removes suspended solids or solids by centrifugation or gravity has caused problems of polluting the ecosystem by being discharged into the water without sufficiently removing the solids or chemicals in the form of fine particles. It is thought that steel balls are needed.

In addition to these floats and solids, phosphorus introduced into the discharge water through sewage causes a large amount of algae in the water causing eutrophication as nutrients, which adversely affects the aquatic ecosystem.

When treating water with pollutants and phosphorus, which cause these problems, inject chemicals to remove turbid turbidity, suspended matter, or phosphorus in water to form floc particles and process them by flocculation and filtration. have.

Large-scale treatment facilities such as general waterworks or sewage treatment plants have separate flocculation tanks, condensation tanks, and sedimentation tanks for the above-mentioned processes, which require a considerable burden on facility area, and are difficult to operate and manage. This is followed.

The conventional treatment of combined sewage used in the conventional sewage treatment system, where the sewage that exceeds the facility capacity of the sewage terminal treatment plant where the condensate sewage flowing into the sewage terminal treatment plant from the sewage sewage terminal in the primary sedimentation tank is settled to the public waters without being completely treated The reality is that they are stocked.

Thus, the sewage that is discharged from the overflow and sewage is precipitated and removed only a large amount of solids in the process of simple sedimentation, causing a problem of polluting the downstream ecosystem by being discharged to public waters without a considerable amount of pollutants.

In the meantime, the sewage treatment plant in Korea has been installed and operated with advanced treatment facilities by strengthening the discharged water quality standard several times.In case of heavy rain, sewage is properly treated and discharged. Since sewage is not fully treated, it is overflowed and discharged, which adversely affects water pollution and ecosystems in downstream public waters, and therefore, there is an urgent need for the development of appropriate treatment technology to solve this problem.

Therefore, the present invention is to enable the high-speed treatment of a large amount of rain and sewage in order to solve the above problems.

SUMMARY OF THE INVENTION An object of the present invention is to provide a filtration apparatus capable of rapidly and effectively removing various types of contaminants, particularly SS and TP, which will flow out of a point source or a nonpoint source contained in contaminated water, and continuously maintaining a treatment efficiency. .

The present invention is designed to treat contaminants in such a way that the flocculated floc passes through the filtration layer part composed of porous flotation media, which significantly improves the filtration treatment ability.

In particular, the filtration device of the present invention is to pass through the contaminated water to the filtration tank filled with porous flotation media in order to improve the filtration treatment ability to discharge the treated water through each discharge pipe located in the upper and lower parts of the filtration tank. Bar, this is a breakthrough from the conventional upflow or downflow processing to implement a bidirectional (or complex) processing to significantly increase the processing speed.

The present invention is characterized in that the floc is formed by chemical aggregation to increase the filtration efficiency of the contaminants.

Porous flotation media used in the present invention is designed to treat contaminants while increasing the filtration capacity per unit area because it has a light weight and high porosity so that it can float in water.

In the filtration apparatus according to the present invention, if sludge is excessively trapped on the surface of the porous flotation media during a long time filtration process, it causes the closing phenomenon of the porous flotation media to increase the filtration resistance and lower the filtration efficiency, the treated water to be discharged In order to overcome the problem that the content of SS is significantly increased in the lower part of the filtration tank, the back washing air is dispersed upwardly, while the back washing water is supplied downward from the upper part of the filtration tank so that sludge adhered to the porous flotation media can be peeled off. It is characterized by including a backwashing facility separately.

According to the description of the present invention, the present invention is provided to prevent the treatment water, in particular rainwater, river water, lake water, sewage, wastewater, contaminants of various types contained in the constant water is not directly introduced into the water system. That is, it can be usefully applied to stormwater and sewage treatment or to clean up wastewater and river water or polluted lakes.

The filtration apparatus according to the present invention is provided with discharge pipes at the upper and lower portions of the filtration tank to implement the upflow and downflow filtration at the same time, so as to facilitate the rapid discharge of a large amount of treated water to significantly improve the filtration treatment capacity. .

In addition, the filtration device according to the present invention is provided to maximize the filtration efficiency by maintaining the filtration layer in an optimal state by back washing the porous flocculant in the filtration tank.

1 is a schematic diagram schematically showing a high speed filtration apparatus according to the present invention.
Figure 2 is a schematic diagram showing an operation process according to the use example of the filtration tank provided in the high speed filtration device of the present invention.

Now, the ultra-fast filtration and backwashing device according to the present invention will be described in more detail with reference to the accompanying drawings.

1 is a schematic diagram of a high speed filtration apparatus according to the present invention.

As shown, the filtration device 1 with ultrafast filtration and backwashing function according to the present invention comprises a floc forming tank 10, a filtration tank 20, and a concentration tank 30. In the filtration device 1 of the present invention, contaminated water (eg, rainwater or sewage) is guided to the floc forming tank 10 through the inlet 110.

The floc forming tank 10 provides a space for sufficiently stirring the contaminated water and the coagulant guided to the inlet 110, the floc forming tank 10 to form a floc (suspended particles) It is composed of one or more mixed paper 120 in order to ensure a sufficient retention time of the contaminated water. Preferably, the mixed paper 120 of the floc forming tank 10 includes a chemical supply unit 121 for administering a flocculant to contaminated water, and an agitator 122 for mixing and stirring the flocculant and contaminated water.

By stirring, the floc is formed in the floc forming tank 10 and guided to the filtration tank 20 along the guide tube 11 extending from the final blended paper 120 of the floc forming tank 10 for the next process. . The guide tube 11 is provided with a valve 12 that can control the flow of the floc and contaminated water to be guided from the floc forming tank 10 to the filtration tank 20.

The filtration tank 20 is designed to provide a contact space between the contaminated water to be guided along the guide tube 11 and the porous media 40, 140, the guide tube 11 from the final blended paper 120 as shown. It extends through the side wall of the filtration tank 20 to the inside of the filtration tank 20, in particular, one end of the guide tube 11 is inside the filtration tank 20, specifically, the first screen 230 and the second screen 240. Position between).

The filtration tank 20 has an upper discharge pipe 220, a first screen 230 arranged across the filtration tank 20 under the upper discharge pipe 220, and a second arrangement arranged across the filtration tank 20 on the bottom surface thereof. The screen 240, the lower discharge pipe 270 penetrating the side wall of the filtration tank 20 below the second screen 240, and the sludge discharge pipe 260 located at the lower end of the filtration tank 20. In particular, the filtration tank 20 has a porous flotation filter 40 and a porous precipitation filter 140 between the first screen 230 and the second screen 240.

Filtration device 1 according to the present invention is to continue to perform the filtration treatment according to the supply of contaminated water, in particular, as the filtration treatment, the clogging phenomenon of the porous precipitated media as well as the porous flotation media gradually progress, Along with this, the discharged amount of the treated water to be discharged may drop significantly, and the SS content which is not completely filtered may increase in the treated water discharged to the upper discharge pipe or the lower discharge pipe. If this occurs, a backwashing facility must be operated to shut off the additional supply of contaminated water and to reliably clean the porous flotation media and the porous settling media to be reused. In this case, in order to be able to automatically handle the determination of the backwash time, the present invention includes a detector (S) in the first and / or lower discharge pipe (220, 270), in particular the detector is the upper and / or lower discharge pipe It is possible to measure the flow rate of the treated water flowing out to or to detect the level of the filtration tank, and to measure the SS content in the treated water flowing out of the filtration tank or into the discharge pipe.

It is preferable to have a backwashing facility to be used when backwashing the porous flotation filter 40 and the porous precipitation filter 140 filled in the filtration tank 20. The backwashing facility includes a blowing means for supplying air and a backwashing water. It consists of a water supply means for supplying. The blowing means is composed of a backwash blower 251 and a pipe 252 extending from the blower 251 to the inside of the filtration tank 20 and at least one diffuser 253 branched from the pipe 252, in particular The pipe 252 is preferably disposed below the second screen 240.

In addition, the pipe 252 is provided with a valve 254, which opens when backwashed to allow the forced air to be generated from the blower 251 to be supplied to the filtration tank 20. In other processes other than backwashing, for example, during filtration, the valve 254 is closed to prevent contaminated or treated water contained in the filtration tank 20 from flowing into the pipe 252.

Another means for backwashing, the water supply means consists of a pipe 262 extending long from the backwashing water source or rinse tank 60 to the top of the filtration tank 20, preferably above the first screen 230. Pipe 262 may be provided with one or more nozzles 263 at its distal end to evenly spray backwash water into the filtration tank. Optionally, for smooth supply of backwash water, the water supply means may further comprise a pump (P).

Porous flotation filter 40 to be used in the filtration tank 20 of the present invention is a mixture of a blowing agent in a glass powder having a small particle size, the mixture is heated to a high temperature (for example, 800 ~ 1,200 ℃) and cooled by grinding it When drying, the bulk density is 0.2 ~ 0.6g / cm3, the porosity is 60 ~ 90%, and the size is 30 ~ 70mm, and when the water saturates, the bulk density is smaller than 1g / cm3 and floats in water. Less than 0.8 g / cm 3 at saturation is preferred.

In addition, the porous precipitate medium 140 to be used in the filtration tank 20 of the present invention is mixed with a blowing agent in a glass powder having a small particle size, and the mixture is heated to a high temperature (for example 800 ~ 1,200 ℃) and pulverized by cooling it In one embodiment, the particle diameter is about 20 to 50 mm, and the porous particles have a volume density of 0.6 to 1.5 g / cm 3 at drying, a volume density of 1.2 to 2.0 g / cm 3 at a water saturation, and a porosity of 50% or less. For reference, the volume density at the time of water saturation of the porous precipitation medium 140 to be applied to the present invention is 1.2 to 2.0 g / cm 3, preferably 1.3 to 1.8 g / cm 3.

In other words, the porous precipitation filter 140 and the porous flotation filter 40 is formed by mixing the blowing agent in the glass powder and heating it to a high temperature to cool and pulverize it. The porous precipitation filter 140 has a relatively small porosity. It is precipitated, and the porous flotation filter 40 floats in water by increasing the porosity therein.

As described above, the first screen 230 and the second screen 240 are arranged at dense intervals smaller than the size of the porous flotation media or porous precipitation media to form the porous flotation media 40 and the porous precipitation media 140. The upper discharge pipe 220 and the lower discharge pipe 270 and the sludge discharge pipe 260 is not lost.

The floc and the contaminated water may be introduced into the filtration tank 20 along the guide tube 11 extending from the final mixed paper 120 to the filtration tank 20. The floc and contaminated water introduced into the filtration tank 20 are filtered in contact with the porous flotation media 40 and the porous precipitation media 140, while the treated water filtered through the porous flotation media 40 is upflowed. Passing through the first screen 230 along the upper discharge pipe 220 is sent to the external water system. At the same time, the treated water filtered through the porous precipitation medium 140 is passed down the second screen 240 while being discharged to the external water system along the lower discharge pipe 270.

Specifically, the first end of the guide tube 11 is arranged in fluid communication with the final mixed paper 120, while the second end opposite the guide tube 11 is inserted into the filtration tank 20. As described above, the guide tube 11 is characterized in that it is extended to the inside of the filter tank (20). The guide tube 11 supplies the contaminated water and the floc to the filtration tank 20, and the contaminated water and the floc are provided with sufficient contact opportunities with the porous flotation media 40 and the porous sedimentation media 140 of the filtration tank 20. Allow to be filtered.

To this end, that is, in order to ensure contact between the contaminated water and the porous flotation filter and the porous precipitation filter, the second end of the guide tube 11 introduced through the side wall of the filtration tank 20 to the inside of the filtration tank 20. It extends in length, but is preferably located between the first screen 230 and the second screen 240 of the filtration tank 20, in particular arranged in the space between the first screen 230 and the second screen 240 It is inserted into the empty space between the filtration layer portion not to be directly contacted or inserted into the filtration layer portion consisting of the porous flotation filter 40 and the porous precipitation filter 140 to be. Here, the term "empty space" means that the volume density of the porous flocculant during water saturation is less than 1 g / cm 3, resulting in the surface of contaminated water while the volume density of the porous precipitated media is greater than 1 g / cm 3. As the floating porous media in the suspended state and the porous precipitate media in the settled state do not completely fill the inner space defined by the side wall of the filtration tank and the first and second screens, the filtration layer part composed of the porous precipitated media in the inner space. And a gap between the filter layer consisting of porous flotation media will provide a gap. That is, the porous flotation media 40 and the porous precipitation media 140 are filled with the porous media 40 and 140 between the porous flotation media 40 to be suspended with contaminated water supplied during filtration and the porous precipitation media 140 to sink. It is preferable to fill the space between the screens 230 and 240 so that the second end (or end) of the guide tube 11 can be extended with an empty space filled with contaminated or treated water without being supported. In particular, the porous flotation filter 40 and the porous precipitation filter 140 are preferably filled at about 80% by volume to about 90% by volume with respect to the sides of the filtration tank 20 and the internal space formed by the first and second screens 230 and 240. Do. Optionally, the second end of the guide tube 11 extends to an intermediate point between the first screen 230 and the second screen 240.

The porous flotation filter 40 and the porous precipitation filter 140 may not be completely filled instead of filling a part between the first screen 230 and the second screen 240. When the space between the first screen 230 and the second screen 240 is completely filled with the porous flotation media 40 and the porous precipitation media 140, it cannot be caused to cause turbulent flow between the porous flotation media during backwashing. Will be less effective.

In other words, a part of the contaminated water to be discharged from the second end of the guide tube 11 is in contact with the porous floating media 40 positioned and positioned above the second end, and a part of the contaminated water to be discharged from the second end is In contact with the porous precipitation media 140 that is deposited on the second screen 240 under the second end to improve the filtration efficiency and filtration rate. That is, some of the contaminated water exiting the second end flows upward and is filtered in contact with the porous floating filter 40 to exit the upper discharge pipe 220, and some of the contaminated water exiting the second end moves downward. It is designed to contact the porous precipitation media 140 while flowing to exit the lower discharge pipe 270, because the contaminated water and floc is sprayed in all directions in the porous flotation media of the filter tank, the filtered treated water The conventional filtration treatment device is configured to quickly exit to the outside through the upstream and / or downflow caused by the upper discharge pipe installed in the upper portion of the filtration tank and the lower discharge pipe installed in the lower portion of the filtration tank, it is usually moved in one direction to process Rather, the filtration area and filtration rate can be processed twice as fast. In particular, it can be usefully applied to rainwater treatment. In addition, if the supply of sewage is interrupted, the lower discharge pipe 270 is located in the lower portion of the filtration tank 20 so that the amount of treated water can be quickly discharged to the outside without remaining inside the filtration tank as possible. Will provide.

In addition, the upper and lower discharge pipes 220 and 270 may adjust the discharge rate of the treated water by adjusting the opening and closing degree of the valve according to the characteristics of the sewage. For example, when there are a lot of floating pollutants, the lower discharge pipe 270 is opened a lot, and when there are a lot of sedimentary pollutants, appropriate water treatment is possible, such as opening more of the upper discharge pipe 220, thereby enabling a more efficient facility operation.

As the continuous filtration process for contaminated water is carried out, the sludge is trapped on the outer surface of the porous flotation filter 40 and the porous sedimentation filter 140, and the filtration resistance decreases. In addition, the phenomenon of remarkably slowing occurs, and at this time, the air can be injected into the filtration tank 20 through the diffuser 253 to backwash the porous flotation media 40 and the porous precipitation media 140 as well. , Backwashing may be performed by supplying the backwashing water on the porous flotation medium through the pipe 262.

In this backwashing process, the sludge and the backwashing water attached to the porous flotation filter 40 and the porous precipitation filter 140 are discharged under the second screen 240 and guided to the concentration tank 30 through the sludge discharge pipe 260. do. The sludge discharge pipe 260 is installed at the lowest end of the filtration tank 20 as described above with reference to FIG. 1, and in order to improve the discharge rate of sludge separated from the backwash water and the porous media, the side wall of the filtration tank 20 is provided. The sludge discharge pipe (not shown) may be further installed in the sludge discharge pipe, which may be communicated from the side wall of the filtration tank to the thickening tank, or may be joined to the sludge discharge pipe 260 from the side wall of the filtration tank.

The concentration tank 30 collects sludge and scum separated from or separated from the porous flotation media 40 and the porous precipitation media 140 guided along the sludge discharge pipe 260 of the filtration tank 20. To this end, the concentration tank 30 has a rectifier (31) well therein, which helps to settle the sludge in the concentration tank (30). That is, since the contaminated water guided to the thickening tank 30 through the sludge discharge pipe 260 has kinetic energy when it is introduced into the thickening tank, if it is introduced as it is, the contaminated water in turbulent state fluidizes the water contained in the thickening tank and goes to the bottom of the thickening tank. Since sludge, etc. that have been sitting may be injured again, the contaminated water is first introduced into the rectifier 31 to eliminate kinetic energy sufficiently, and when it is introduced into the concentration tank, the laminar flow changes to a laminar state so that the precipitation is made well.

Optionally, the thickener 30 further includes a scraper on its bottom surface, to allow for smooth transfer of sludge that has settled to the bottom of the thickener to the concentrated sludge reservoir.

The thickening tank 30 may guide the sludge separated from the porous flotation filter 40 and the porous precipitation filter 140 to a separate treatment facility, for example, a concentrated sludge storage tank, and the symbol water filtered from the thickening tank 30 is a floc forming tank. By recycling to (10), the sludge contained in the supernatant can be filtered and concentrated again.

The upper and lower discharge pipes 220 and 270 may be mutually communicated to the outside to discharge the treated water to the external water system. Optionally, the upper and lower discharge pipes 220 and 270 are installed to be in communication with each other from the upper and lower sidewalls of the filtration tank 20 to the washing water tank 60 so that the treated water is transferred from the filtration tank 20 to the washing water tank 60. To guide. The washing water tank 60 is a place for temporarily storing the treated water, some of which are used as backwash water along the pipe 262, and the remaining treated water is discharged to the external water system.

Figure 2 is a schematic diagram showing an operation process according to the use example of the filtration device having an ultrafast backwashing function of the present invention. Here, after passing through the floc forming tank, when the filtration device according to the present invention to treat the contaminants contained in the floc and contaminated water, the subdivided into the case of backwashing porous flotation medium and the discharge of sludge after backwashing For the sake of understanding, in order to identify the flow state of the flow rate guided through the guide pipe 11 and the discharge pipes 220, 260, 270, etc., when the flow of water flows along each pipe, the pipe is colored black. . Do not paint pipes without flow. The interior of the filtration tank 20 is not colored separately so that the understanding of the state of contaminated water or backwashing water in the filtration tank 20 can be clarified.

2A is a diagram illustrating the step of filtering contaminated water and / or flocs in the filtration tank 20.

Specifically, the floc and the contaminated water are guided along the guide tube 11 to the inside of the filtration tank 20, more specifically, between the filtration layer part made of the porous flotation medium 40 and the filtration layer part made of the porous precipitation medium 140. The guide tube 11 allows the valve 12 to guide the contaminated water and the contaminants contained in the contaminated water from the floc forming tank 10 (see FIG. 1) to the filtration tank 20. To open. The contaminated water and the floc are guided directly between the porous flotation media 40 and the porous sedimentation media 140 filling the inside of the filtration tank 20, so that the contaminated water and the floc are continuously supplied to the first screen 230 or the second. It penetrates the screen 240 and flows out to the upper discharge pipe 220 or the lower discharge pipe 270. In other words, the filtration tank 20 used in the present invention naturally flows up the contaminated water to flow upward in the filtration layer part made of the porous flotation filter 40 and downward in the filtration layer part made of the porous precipitation medium 140. Bi-directional (or composite) filtration tank designed to be filtered up and down, the treated water filtered upwards is discharged to the external water or washing tank through the upper discharge pipe 220, while the filtered water is treated downward The water may be discharged to the external water system or the washing tank 60 (see FIG. 1) through the lower discharge pipe 270. Unlike the conventional one-way filtration treatment method of the conventional filtration apparatus, the porous flotation filter 40 and the porous precipitation precipitate in the precipitated state in which the second end of the guide pipe 11 is floated so as to be filtered in both directions, that is, in the vertical direction. It is a unique feature of the present invention to arrange the elongated spaces between the spaces 140.

The sludge discharge pipe 260 which communicates from the filtration tank 20 to the concentration tank 30 so that the contaminated water to be guided to the guide tube 11 can be supplied to the filtration tank 20 so as to be filtered. Must be closed. In addition, the pipe 252, which is a backwash blowing means, extends to the inside of the filtration tank 20, so that the valve 254 must be blocked so that the contaminated water does not flow along the pipe 252 to the backwash blower 251. In this way, the valves 261 and 254 are closed, and contaminated water is continuously supplied into the filtration tank 20, and various types of contaminants contained in the contaminated water can be filtered at high speed by using porous flotation media and porous precipitation media. .

2B is a view illustrating a washing step of the filtration layer unit arranged inside the filtration tank 20.

If the sludge is excessively trapped on the surface of the porous flotation filter and the porous precipitation filter, the filtration resistance is increased, and thus the filtration efficiency is reduced. The following washing step is performed: the porous flotation filter 40 and the porous precipitation filter (140). The backwashing process of)) first blocks the valve 12 of the guide tube 11 to cut off the supply of contaminated water, and the valve of the sludge discharge pipe 260 to maintain a certain amount of water level in the filtration tank 20. 261 and the valves 221 and 271 of the discharge pipes 220 and 270 are also blocked. In other words, the predetermined water level is maintained at a height high enough to impregnate the porous floating medium 40, for example, the installation position of the first screen 230.

Filtration device according to the present invention can easily determine the time of backwashing through the performance test of the treated water discharged from the filtration tank to the upper and lower discharge pipe, that is, to measure the SS content in the treated water or the phase located on the filter tank Detects the flow rate of the treated water to flow out through the lower discharge pipe, and if the SS content is higher than the preset standard value or the discharged flow rate of the treated water is reduced, it is judged to reduce the efficiency of filtration treatment due to the blockage of the porous flotation filter and the porous precipitation filter. You will perform a backwash.

When the backwash blower 251 is started, the valve 254 is opened, and the high pressure air supplied to the blower 251 is guided into the filtration tank 20 along the pipe 252. In particular, this air is supplied to the entire filtration tank 20 by means of the diffuser 253.

The air may turbulent flow of the contaminated water or backwashing water filled in the filtration tank 20 to exfoliate sludge, for example, SS, attached as a collision between the porous flotation media and the porous precipitation media. Optionally, the diffuser 253 may be disposed below the second screen 230 as shown, or alternatively may be disposed above the second screen 230.

In addition, the sludge separated from the porous flotation filter 40 and the porous precipitation filter 140 does not capture again, and cleans the filtration layer cleanly, and at the same time separates the back washing water supply means for supplying the backwash water to easily discharge the sludge. Equipped. The water supply means supplies the backwash water to the pipe 262 extending from the washing tank 60 or other backwashing water source to the upper part of the filtration tank 20, and includes a pump P to smoothly supply the backwashing water. It may be. In this way, the backwash water from the upper part of the filtration tank can be supplied or sprayed into the filtration tank.

2C is a view illustrating a discharge step of the sludge accumulated in the lower part of the filtration tank 20.

After the sludge is sufficiently peeled off from the porous flotation filter 40 and the porous precipitation filter 140, the valve 254 and the valve 264 are closed because the backwashing facility, that is, the operation of the blowing means and the water supply means is stopped. The valve 12 of the guide pipe 11 is closed and the valve 261 of the sludge discharge pipe 260 is opened. The sediment accumulated at the bottom of the filtration tank 20 and the sludge separated from the filtration layer are swept by the backwash water filled in the filtration tank 20 and sent to the concentration tank 30 (see FIG. 1) along the sludge discharge pipe 260.

It is to be understood that the invention is not limited to the foregoing detailed description, the examples and the accompanying drawings, which may be modified within the scope and scope of the following claims.

1 ----- filter,
10 ----- floc forming tank,
11 ----- Concierge,
12, 221, 254, 261, 264, 271 ----- valve,
20 ----- filtration tank,
30 ----- thickener,
40 ----- porous flotation media,
140 ----- porous precipitation media,
220, 260, 270 ---- exhaust pipe.

Claims (10)

A floc forming tank (10) having an inlet (110) for supplying sewage and at least one mixed paper (120) and a medicine supply (121) for administering a flocculant to the mixed paper (120);
A first screen 230 in fluid communication with the floc forming tank 10 and the guide tube 11, and arranged across the top, and a second arranged across the bottom in parallel with the first screen 230. The screen 240, the porous flotation filter 40 and the porous precipitation filter 140 accommodated between the first screen 230 and the second screen 240, to guide the treated water to an external aqueous or washing tank (60) A filtration tank 20 having a discharge pipe and a sludge discharge pipe 260 positioned at the lowermost end to discharge sediment or sludge to the outside;
Opening and closing the blower 251, the pipe 252 extending from the blower 251 to the inside of the filtration tank 20, at least one diffuser 253 provided at the distal end of the pipe 252, and the pipe 252. Back-flushing means having a valve (254) to make; And
In the filtration device consisting of; Concentration tank 30 to be in fluid communication with the sludge discharge pipe 260 extending from the lower portion of the filtration tank 20 to collect the sludge, etc. peeled off during backwashing,
The guide tube 11 floats through the side wall of the filtration tank 20 from the floc forming tank 10 with water filled in the filtration tank 20 between the first screen 230 and the second screen 240. The length of the empty space between the porous flotation medium 40 and the porous precipitation medium 140 precipitated on the second screen 240 is extended,
The discharge pipe is composed of an upper discharge pipe 220 disposed on the first screen 230 and a lower discharge pipe 270 disposed below the second screen 240.
The contaminated water to be transferred to the guide tube 11 is filtered through the porous flotation filter 40 to be filtered into the upper discharge pipe 220 and the porous precipitation filter 140 to be treated as the lower discharge pipe 270. Filtration device with ultra-fast filtration and backwashing, characterized in that it is configured to allow the bi-directional water treatment by discharging the outside.
According to claim 1, wherein the porous flotation filter 40 and the porous precipitation filter 140 is 80% by volume of the inner space to be formed of the side wall surface of the filter tank 20 and the first and second screens (230,240) Filtration device, characterized in that provided to fill the 90% by volume.
The filtration device according to claim 1, wherein the distal end of the guide tube (11) extends through the filtration tank (20) at an intermediate point between the first screen (230) and the second screen (240).
The method of claim 1, wherein the porous flocculant 40 is mixed with a blowing agent in a glass powder having a small particle size, the mixture is heated and heated to a high temperature to cool and pulverized, the volume density during drying 0.2 ~ 0.6g / 3. The filtration device according to claim 3, wherein the volume density at the time of water saturation is less than 1 g / cm 3, and the porosity is 60 to 90%, and the size is 30 to 70 mm.
The method of claim 1, wherein the porous precipitation medium 140 is a glass powder having a small particle size is mixed with a mixture of a blowing agent, the mixture is heated to a high temperature and cooled to be pulverized, the particle size is 20 ~ 50mm And a volume density of 0.6 to 1.2 g / cm 3 at drying, a volume density of 1.2 to 2.0 g / cm 3 at saturation of water, and a porosity of 50% or less.
According to claim 1, further comprising a detector (S) in the filtration tank 20, it is possible to determine the backwash timing, and to control the amount of backwash water so that the backwash water does not overflow the filtration tank 20 Filtration device, characterized in that.
The filtration apparatus according to claim 6, wherein the detector (S) is installed in an upper discharge pipe (220) or a lower discharge pipe (270) of the filtration tank (20).
The water supply for backwashing according to claim 1, further comprising a pipe 262 which is in long communication from the backwash water supply source to the upper portion of the filtration tank 20, and a valve 264 and a nozzle 263 for opening and closing the pipe 262. Filtration device comprising a means.
The filter apparatus according to claim 1, wherein the symbol water filtered in the concentration tank is recycled to the inlet 110.
According to claim 1 or 9, wherein the concentration tank 30 is further provided with a rectification tank 31 therein, the sludge to be guided to the sludge discharge pipe 260 and the backwash water to the rectifier (31). Filtration device, characterized in that guided and stabilized.

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