KR101892276B1 - advanced water treating apparatus using media filtering - Google Patents

Abstract

The present invention relates to an advanced water treatment apparatus for wastewater using media filtering, and more specifically, to an advanced water treatment apparatus for wastewater, which can treat fine floating materials in discharge water finally discharged from the apparatus, by installing a filtration tank filled with filter media on the rear end of a water treatment process.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an advanced water treatment apparatus using media filtering,

The present invention relates to a wastewater treatment apparatus for wastewater. More particularly, the present invention relates to a wastewater treatment apparatus using a filtration tank filled with a settling tank and a filter medium at the end of a water treatment process, The present invention relates to an apparatus and method for highly water-treating a wastewater.

In the modern society, industrialization and urbanization are accelerating day by day, and the environmental pollution that is generated thereby becomes a big problem to be solved in the modern society.

Especially, wastewater such as sewage, wastewater, and sewage discharged from households or factories of environment pollutants contains harmful substances such as nitrogen, phosphorus, and organic substances, and therefore, a facility for purifying and discharging it must be essentially applied.

Water treatment technology for purifying wastewater has been developed in recent years. Water treatment technology is used in many fields such as wastewater, high concentration organic wastewater, various industrial wastewater, non-point pollution abatement facilities, heavy water, and reusable water.

Activated sludge method is widely used as a conventional water treatment technique. In this activated sludge method, first and second settling tanks are essential processes and occupy many processes. However, this method suffers from the problem that the floating water flows out due to the floating and expansion phenomenon of the sludge depending on the amount of the influent of the wastewater during the winter and the summer, thereby contaminating the river water system.

Among the various water treatment methods that solve these problems, there is a MBR (Membrane) series water treatment method in which a high concentration MLSS (Mixed Liquor Suspended Solid) of an aeration tank is formed and maintained and a filtration function is combined.

However, the water treatment method of the MBR series not only has a high initial investment cost, but also is difficult to maintain and manage at a normal time, requires careful attention, and has a problem in that additional facility investment costs are continuously incurred by periodically replacing it with the concept of consumables.

Accordingly, there is a growing demand for a water treatment technology that can simplify and improve the treatment efficiency and economical efficiency.

Korean Patent No. 10-1416451 discloses a membrane-bound fluidized bed anaerobic wastewater treatment apparatus.

Although the wastewater treatment apparatus is designed to enhance the water treatment effect by installing a separation membrane and a fluid phase filter in the bioreactor, the separation membrane is used together, which causes difficulties in maintenance and increases facility cost. In addition, there is a problem that the contaminant adheres to the surface of the fluidized filter media over time, and the water treatment effect is greatly deteriorated.

Korean Patent No. 10-1416451

An object of the present invention is to provide an advanced water treatment apparatus for wastewater treatment capable of treating fine suspended substances in discharged water finally discharged without using a separation membrane by providing a settling tank and a filtration tank at the end of a water treatment process The purpose is to do.

In order to achieve the above object, an apparatus for treating wastewater according to the present invention comprises an anaerobic tank for removing phosphorus in a water to be treated, An anoxic tank installed downstream of the anaerobic tank for removing nitrate nitrogen from the anaerobic tank; An anoxic tank for nitrifying nitrogen into a water to be treated which flows from the anoxic tank when it is installed at an end of the anoxic tank; A sedimentation tank installed downstream of the oxic tank and separating the water to be treated from the oxic tank into a supernatant and sludge; A filtration tank installed at a rear end of the settling tank and having a supernatant separated from the settling tank, A filter unit installed in the filtration tank to remove suspended matter contained in the supernatant introduced into the filtration tank; Backwashing means for backwashing the filter unit; A first sludge conveying unit for conveying sludge from the oxic tank to the anoxic tank; And a second sludge conveyance part for conveying the sludge settled in the settling tank to the anaerobic tank.

Wherein the filter unit comprises: a lower porous plate horizontally installed in the filtration tank; an upper porous plate horizontally installed inside the filtration tank to be spaced upward from the lower porous plate; And the backwashing means comprises an aeration portion for aerating the air to the lower portion of the filtration tank, a rotating shaft vertically installed in the filter material retention space, A driving motor installed on the upper portion of the filtration tank for rotating the rotary shaft, and a cleaning blade installed on the rotary shaft.

Wherein the cleaning blade has a pair of first and second support bars coupled to an outer circumferential surface of the rotary shaft and extending horizontally outwardly of the rotary shaft and spaced up and down, A first helical member which is installed on the first support member and has both ends fixed to the first and second support bars, wherein the guide member has a first helical member formed by vertically long rectangular plates twisted and arranged so as to be spaced apart from the first helical member The first helical member and the second helical member are formed to be twisted in opposite directions to each other.

And a filter guide guider installed at an upper portion of the first support bar so as to push out filter media located in an upper layer of the filter medium retention space when the rotation shaft rotates, outwardly of the rotation axis.

As described above, according to the present invention, a sedimentation tank and a filtration tank are provided at the end of the water treatment process, and the fine suspended substances in the discharged water finally discharged can be treated without using a separation membrane.

In addition, periodic backwashing of filter media is possible, so that deterioration of water treatment efficiency can be prevented even if time passes.

1 is a block diagram showing a configuration of an apparatus for water treatment of wastewater according to an embodiment of the present invention,
FIG. 2 is a cross-sectional view showing a state of a filtration tank applied to FIG. 1,
Fig. 3 is a perspective view excerpted from another example of a principal portion applied to the present invention,
4 is a perspective view showing another example of a recess applied to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an apparatus for treating wastewater according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2, an apparatus for water treatment of wastewater according to an exemplary embodiment of the present invention includes an anaerobic tank 10 for removing phosphorus in water to be treated flowing from a flow rate control tank 5, An oxic tank 20 for nitrifying nitrogen by aerating the air into the water to be treated flowing from the anoxic tank 15 and an oxic tank 20 for nitrifying nitrogen into the water to be treated flowing from the oxic tank 20 A sedimentation tank 25 for separating the target water into a supernatant and sludge, a filtration tank 30 through which the supernatant separated from the sedimentation tank 25 flows into the lower portion and is discharged to the upper portion, A backwashing means for backwashing the filter unit 40 and a second sludge returning means for returning the sludge from the aerobic tank 20 to the anoxic tank 15, A transfer part, and a transfer part And a second sludge conveying section for conveying the sludge to the anaerobic tank (10).

The sewage or wastewater to be treated can be introduced into the flow rate regulator 5 through a pretreatment device, such as a screen or a needle bed. The flow rate adjusting tank 5 serves to adjust the inflow amount of the water to be treated and the pollution load equally.

The anaerobic tank 10 is provided at the downstream of the flow rate adjusting tank 5 to remove phosphorus in the water to be treated flowing from the flow rate adjusting tank 5.

The anaerobic tank 10 releases phosphorus by 3 to 4 times the influent concentration using microorganisms. Although not shown, the anaerobic tank 10 may be equipped with a conventional stirring device for even distribution.

The anoxic tank (15) is disposed at the downstream end of the anaerobic tank (10) to remove nitrate nitrogen from the treated water flowing from the anaerobic tank (10).

The anoxic tank 15 may be equipped with a conventional stirring device for uniform distribution.

The anoxic tank 15 is operated under an anaerobic condition with an extremely low oxygen concentration, and nitrate nitrogen in the water to be treated flowing from the anaerobic tank 10 is converted into nitrogen gas and discharged to the atmosphere to be removed. Such a denitrification reaction may be performed by denitrifying microorganisms such as Pseudomonas, Micrococcus, Bacillus, and the like.

The oxic tank 20 is provided at the rear end of the anoxic tank 15 to aerate the nitrogen into the water to be treated which flows from the anoxic tank 15, thereby nitrifying the nitrogen. At the same time, organic matter is removed and excess phosphorus is ingested.

The aerobic tank 20 is provided with aeration means for aerating the inside thereof. Conventional structures may be used as such aeration means. For example, an air diffuser installed in the aerobic tank 20 and a blower for supplying air to the diffuser.

The first sludge return section transports the sludge from the oxic tank 20 to the anoxic tank 15. The concentration of the microorganisms in the anoxic tank 15 can be kept constant through the sludge transportation.

The first sludge conveying section includes a first conveyance line 1 for connecting the oxic tank 20 and the anoxic tank 15 and a pump provided on the oxic tank 20 for pumping sludge to the first conveyance line 1, .

The settling tank 25 is installed at the rear end of the oxic tank 20. The water to be treated which has passed through the oxic tank 20 flows into the settling tank 25.

In the settling tank (25), the sludge goes downward and the supernatant liquid and the sludge are separated into solid and liquid. The supernatant separated in the settling tank (25) flows into the filtration tank (30). The sludge settled in the lower part of the settling tank 25 is discharged to the outside. A part of the discharged sludge is transported to the anaerobic tank 10 through the second sludge transporting section so that the concentration of microorganisms in the anaerobic tank 10 can be maintained.

The second sludge conveying portion includes a second conveying line 3 connecting the settling tank 25 and the anaerobic tank 10 and a pump (not shown) provided in the settling tank 25 for pumping sludge to the second conveying line 3, ≪ / RTI >

The filtration tank 30 is installed at the rear end of the settling tank 25. The supernatant separated from the settling tank 25 flows into the lower portion of the filtration tank 30. The connection pipe 31 connects the upper part of the sedimentation tank 25 and the lower part of the filtration tank 30 for this purpose. The supernatant flowing into the filtration tank 30 passes through the filter unit 40 to remove fine contaminants. The discharged water finally passed through the filter unit 40 is discharged to the outside through the discharge pipe 33 installed on the upper part of the filtration tank 30.

A filter unit (40) is installed inside the filtration tank (30). The filter unit 40 serves to remove contaminants such as fine suspended solids in the supernatant flowing into the filtration tank 30.

The filter unit 40 includes a lower perforated plate 41 horizontally installed in the filtration tank 30 and an upper perforated plate 41 horizontally installed inside the filtration tank 30 so as to be spaced upward from the lower perforated plate 41. [ (43), and a plurality of filter media (45) accommodated in a filter medium retention space between the lower filter plate (41) and the upper filter plate (43) and having a specific gravity smaller than 1.

The lower and upper perforated plates 41 and 43 are formed with a plurality of holes so as to cut off the passage of the filter medium 45 and to allow the passage of stormwater. The lower and upper perforated plates 41 and 43 may have a mesh structure.

The filter medium 45 is accommodated in the filter medium retention space between the upper and lower webs 23 and 25. The total volume of the filter media 45 accommodated in the filter material storage space is preferably 40 to 80% (v / v) of the filter material storage space. This is for securing the flow space of the filter media 45 during backwashing.

The filter medium (45) should have a large surface area and be able to flow according to the flow of water. Therefore, the specific gravity of the filter medium 45 is smaller than one. For example, the specific weight of the filter medium 45 may be 0.6 to 0.9. The filter medium 45 is preferably a porous structure so as to increase filtration efficiency. Such a filter material (45) can be applied to a fibrous filter material and a sponge-structure synthetic resin filter material. The filter medium 45 may be formed in a spherical shape or an elliptical shape. The filter medium (45) has an excellent adsorbing ability and can effectively remove colloidal suspended solids.

Since the specific gravity of the filter medium 45 is smaller than 1, it is concentrated in the direction of the upper perforated plate at the time of filtration.

As time passes, contaminants adhere to the surface of the filter medium 45 and the filtration efficiency decreases. It is therefore desirable to periodically backwash the filter media through the backwash means.

The supernatant stored in the filtration tank during backwashing can be used as wash water. Alternatively, separate washing water may be supplied from the outside to the inside of the filtration tank to be backwashed.

The illustrated backwashing means includes an aeration unit 50 for aeration of air into the lower part of the filtration tank 30, a rotation shaft 60 vertically installed in the filter medium retention space, A driving motor 61 for rotating the rotary shaft 60, and a cleaning blade 65 provided on the rotary shaft 60.

The air vent 50 blows air at the bottom of the filter unit 40 to flow the filter medium 45.

An air compressor 51 and an ejection pipe 55 connected to the air compressor 51 and installed at the bottom of the filtration tank 30 are provided as an example of the vent 50. A plurality of air outlets are formed in the air outflow pipe (55). The high-pressure air injected through the jet pipe 55 rises and flows through the filter medium 45 in the filter medium staying space.

A rotating shaft 60, a driving motor 61 and a cleaning blade 65 are installed to collide with the filter medium 45 during flow of the filter medium 45 to improve the cleaning effect.

The rotating shaft 60 passes through the upper perforated plate 43 and is vertically installed in the media retaining space. A driving motor 61 for rotating the rotary shaft 60 is installed on the upper portion of the filtration tank 30.

Washing wings (65) are installed on the rotary shaft (60).

The cleaning blade 65 is coupled to the outer circumferential surface of the rotary shaft 60 and extends horizontally outwardly of the rotary shaft 60. In the illustrated example, two wash blades 65 are provided on the upper and lower sides, respectively.

When the driving motor 61 is operated during backwashing, the cleaning blade 65 rotates in one direction to collide with the flowing filter media 45, thereby removing the contaminants adhering to the surface of the filter media 45.

FIG. 3 shows a washing wing according to another embodiment of the present invention.

Referring to FIG. 3, the washing wings are installed on both left and right sides of the rotating shaft 60, respectively.

Each of the cleaning blades includes a pair of first and second support bars 71 and 73 which are coupled to the outer circumferential surface of the rotary shaft 60 and extend horizontally outwardly of the rotary shaft 60 and are vertically spaced apart from each other, And the second support bars 71 and 73. The first and second support bars 71 and 73 are fixed to the first and second support bars 71 and 73, respectively.

The rotation inducing unit includes a first helical member 75 formed by vertically elongating a rectangular plate and a second helical member 77 disposed in parallel and spaced apart from the first helical member 75 and formed by vertically elongating a rectangular plate Respectively.

The turning guide portion is provided with a first helical member (75) and a second helical member (77).

The first helical member 75 and the second helical member 77 are arranged laterally between the pair of first and second support bars 71 and 73.

The first helical member 75 is formed by twisting the rectangular plate in a predetermined direction. For example, the first helical member 75 has a shape distorted by 90 degrees. The first helical member 75 is twisted in the clockwise direction as it travels from the first support bar 71 toward the second support bar 73.

The second helical member 77 is also formed by twisting the rectangular plate. The second helical member 77 has a shape distorted by 90 degrees. The second helical member 77 is twisted in the opposite direction to the first helical member 75. The second helical member 77 is twisted in the counterclockwise direction in the direction from the first support bar 71 toward the second support bar 73.

As described above, the first helical member 75 and the second helical member 77 are formed to be twisted in opposite directions to each other, thereby greatly improving the cleaning effect of the filter material. The cleaning water forms a swirling flow around the first helical member 75 in the rotation of the rotary shaft 60 and forms a swirling flow in the opposite direction around the second helical member 77. [ Vortical flow is generated while swirling flow of the opposite directions collide with each other between the first helical member 75 and the second helical member 77, thereby enhancing the cleaning effect of the filter media.

4 shows a washing wing according to another embodiment of the present invention.

Referring to FIG. 4, the cleaning blade is further provided with a filter material guide 80.

The filter media guider 80 serves to push the filter media located in the upper layer of the media material storage space toward the outside of the rotation shaft 60 when the rotation shaft 60 rotates.

The media guide 80 is installed at an upper portion of the first support bar 71 at an angle. The media guider 80 is staggered at an angle of 10 to 40 degrees with respect to the first support bar 71. [ A plurality of filter media (80) are installed at regular intervals.

When the washing blade is rotated in the clockwise direction, the filter media located on the upper layer of the filter medium retention space are pushed toward the inner side of the filtration tank by the obliquely installed filter medium guider (80). The filter media pushed to the inner side of the filtration tank descends along the inner surface of the filtration tank and then rises again by the air that is ejected. As described above, since the upper and lower layers of the filter medium holding space are continuously circulated, the filter media can be cleaned and the cleaning effect can be further enhanced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation. Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

5: Flow control tank 10: Anaerobic tank
15: anoxic tank 20: aerobic tank
25: settling tank 30: filtration tank
40: filter unit 45: filter medium

Claims (4)

An anaerobic tank for removing phosphorus in the water to be treated flowing from the flow rate adjusting tank; An anoxic tank installed downstream of the anaerobic tank for removing nitrate nitrogen from the anaerobic tank; An anoxic tank for nitrifying nitrogen into a water to be treated which flows from the anoxic tank when it is installed at an end of the anoxic tank; A sedimentation tank installed downstream of the oxic tank and separating the water to be treated from the oxic tank into a supernatant and sludge; A filtration tank installed at a rear end of the settling tank and having a supernatant separated from the settling tank, A filter unit installed in the filtration tank to remove suspended matter contained in the supernatant introduced into the filtration tank; Backwashing means for backwashing the filter unit; A first sludge conveying unit for conveying sludge from the oxic tank to the anoxic tank; And a second sludge conveyance part for conveying the sludge settled in the settling tank to the anaerobic tank,
Wherein the filter unit comprises: a lower porous plate horizontally installed in the filtration tank; an upper porous plate horizontally installed inside the filtration tank to be spaced upward from the lower porous plate; And a plurality of spherical or elliptical filter media having a specific gravity smaller than 1,
The backwashing means includes an air vent for blowing air to the lower portion of the filtration tank, a rotation shaft vertically installed in the filter material retention space, a drive motor installed on the filtration tank for rotating the rotation shaft, And a cleaning blade which is installed on both left and right sides of the filter media and which is rotated by the driving motor during backwashing to collide with filter media flowing in the filter media retention space to desorb contaminants adhering to the surfaces of the filter media,
Wherein the cleaning blade has a pair of first and second support bars coupled to an outer circumferential surface of the rotary shaft and extending horizontally outwardly of the rotary shaft and spaced up and down, And a swivel guide portion having both ends fixed to the first and second support bars,
And a second helical member spaced apart from and spaced apart from the first helical member and having a long rectangular plate twisted in an up and down direction,
The first helical member and the second helical member are twisted in opposite directions so that a swirling flow formed around the first helical member and a vortex flow formed around the second helical member collide with each other when the rotation shaft rotates ,
And a filter guide guider installed obliquely on an upper portion of the first support bar for pushing the filter media located in the upper layer of the filter medium retention space to the outside of the rotation axis when the rotation shaft rotates,
Wherein the filter material guides are staggered at an angle of 10 to 40 degrees with respect to the first support bar. The apparatus of claim 1, wherein the filter media has a specific gravity of 0.6 to 0.9. delete delete

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