KR101773304B1 - Biological treatment system of sidestream comprising inclined plates and membrane - Google Patents

Abstract

An embodiment of the present invention relates to a biological treatment system of reflux, the biological treatment system which biologically treats reflux of waste water treatment facilities. The biological treatment system of reflux comprises: an insertion pipe in which reflex branched from main stream flows; a reflux storage tank which temporarily stores the reflux inserted through the insertion pipe; a drum screen unit which is connected to the reflux storage tank and removes impurities included in the reflux; a reaction tank which is connected to the downstream side of the drum screen unit, is divided by forming a multi-separation wall therein, accommodates the reflux and media to enable microorganisms to grow on the surface of the media, and comprises an agitation unit for agitating the reflux and the media; an inclined plate which is installed on the rear end portion of the reaction tank and prevents overflow of the media; a storage unit which receives and temporarily stores only reflux which has passed through the inclined plate; a membrane tank which is connected to the storage unit and comprises a membrane unit which prevents microorganisms from being discharged in the direction of flux; and drain tank which has a upstream side, connected to the membrane tank, and a downstream side, connected to an inlet of main stream and supplies the reflux received from the membrane tank in accordance with capacity of processing the main stream.

Description

TECHNICAL FIELD [0001] The present invention relates to a bioreactor biological treatment system including a swash plate and a membrane,

The present invention relates to a biological treatment system of a reflux water, and more particularly, to a biological treatment system of a reflux water, which comprises a medium on which a microorganism can be proliferated on the surface, a slope plate and a membrane for preventing the microorganisms propagated on the surface of the medium and the medium from being lost Lt; RTI ID = 0.0 > biological < / RTI >

Generally, the sewage treatment process is a process in which inflow sewage is treated with microorganisms in a microbial reactor composed of an anaerobic tank (An), anoxic tank (Ax) and aerobic tank (Ox) after primary precipitation and then sedimented and discharged in a secondary settler . The microorganisms produced in the microbial reactor are called sludge and precipitate in the secondary settler. The sedimented sludge is circulated in some microbial reactors and part of the sludge is discharged and processed through concentration, digestion, and dehydration. Reject water or recycle water such as concentrated supernatant, digestion supernatant, ) Is usually returned to the primary settling tank.

On the other hand, in such a sludge treatment flow, the amount of the recycled water returned to the water treatment process is higher than the flow rate, which is pointed out as a serious problem in the design and operation of the treatment plant.

However, the increase in the load of organic matter (BOD; biological oxygen demand), organic nitrogen, ammonia nitrogen and phosphorus is 20 to 30 times higher than the influent load, %, Up to 40 ~ 70%. In particular, the concentration tank, the digester tank, and the dehydration tank have a complex design and operation problem, and the high concentration of the recirculated water is intermittently returned to the water treatment system, thereby obstructing the stable operation of the sewage treatment process.

Such recirculated water flows into the water treatment system, which greatly increases the organic matter and nitrogen load instantaneously. Especially, when the nitrogen load is increased sharply, it can not be sufficiently removed during the limited treatment time and is discharged through the effluent. Therefore, the effluent quality is severely hindered.

In this regard, Korean Patent No. 1133330 (2012. 03. 28. Announcement) discloses that a part of the recirculated water is subjected to a chemical agglomeration reaction step so that phosphorus is coagulated with the activated sludge, And then introduced into the degumming and first denitrifying tank through the microfiltration device together with the influent raw water to thereby remove the activated sludge contained in the activated sludge, Discloses a membrane-separated high-altitude water treatment system using reflux water and a membrane plugging material to satisfy water quality standards of effluent of phosphorus.

However, since it is difficult to maintain the concentration of the microorganisms used in the denitrification and denitrification process at a predetermined level, there is a problem that the denitrification and denitrification of the reflux water can not be continued to a desired level. Furthermore, there is a problem that sufficient denitrification becomes more difficult because the number of bacteria in the nitrifying bacteria decreases and the nitrification activity remarkably decreases particularly in the low temperature period such as the winter season.

Korean Registered Patent No. 1133330 (2012. 03. 28. Announcement)

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art, and it is an object of the present invention to provide a mediator capable of proliferating microorganisms on a surface thereof so that organic matter removal, And a membrane and a gradient plate for preventing the microorganisms grown on the surface of the medium from being lost.

In order to achieve the above object, one aspect of the present invention provides a biological treatment system for biomass treatment of biomass water in a wastewater treatment plant, comprising: an inlet pipe through which a reflux water branching from mainstream flows; A reflux water storage tank for temporarily storing the reflux water flowing from the inflow pipe; A drum screen part connected to the reflux water storage tank and removing contaminants contained in the reflux water; And a stirring portion connected to the downstream side of the drum screen portion and having a plurality of partition walls formed therein for partitioning the reaction space and accommodating media formed therein so that microbes can grow on the surface thereof, ; A swash plate installed at the end of the reaction tank and preventing the overflow of the medium; A storage unit for receiving and temporarily storing only the number of reflux passes the swash plate; A membrane tank connected to the storage unit and including a membrane part for preventing microbial outflow in a water flow direction; And a drain tank connected to the membrane tank on an upstream side and connected to a main flow inlet on a downstream side and a drain tank for supplying reflux water introduced from the membrane tank in accordance with the processing capacity of the mainstream.

In one embodiment, the swash plate is formed by continuously arranging a plate having holes having a diameter smaller than the outer diameter of the medium, the plate being disposed at an angle of not less than 25 ° and not more than 45 ° from the outer wall of the reaction tank. Lt; / RTI > biological treatment system.

In one embodiment, the gap portion of the continuously disposed plates may further comprise a gap holding portion for preventing the plates from moving due to the flow pressure of the counter current water .

In one embodiment, the multi-partitions include a whirlpool that allows the overflow water to flow, and the overflow part is formed at a position corresponding to the maximum storage level of the reflux water in the multiple partitions and at the lowest part of the multi- Lt; RTI ID = 0.0 > biological < / RTI > treatment system.

In one embodiment, the reaction tank and the membrane tank may include an aeration unit for supplying a gas.

In one embodiment, a reservoir for supplying auxiliary chemicals to the reaction vessel according to the components of the reflux water; A culture tank in which a microorganism is cultured and supplied to the reaction tank; And an organic compound storage tank for supplying the denitration organic compound to the reaction tank.

In one embodiment, the system may further comprise a backwash device for backwashing the membrane by supplying a backwash to the membrane in the reverse direction of the water flow.

According to an aspect of the present invention, it is possible to biologically treat the reflux water branched from the main stream of the wastewater treatment plant to remove various organic substances contained in the reflux water, and perform denitrification and denitrification to the reflux water.

According to an aspect of the present invention, a medium capable of growing a microorganism capable of promoting the nitrification reaction of nitrogen in the semi-permeable water is accommodated in the reaction tank, so that denitrification of the reflux water inside the reaction tank can be achieved.

According to one aspect of the present invention, a swash plate is installed at the end of the reaction vessel to block the overflow of the media and prevent fouling of the membrane that may occur due to the overflow media. Therefore, unnecessary maintenance can be prevented and the operating efficiency is increased.

According to one aspect of the present invention, by including the membrane, the microorganisms that are not blocked by the inclined plate are ultimately blocked, and the microorganisms can be prevented from being contained in the reflux water and flowing out. As a result, microbial efflux and user efforts to regenerate and periodically supply microorganisms are reduced.

It should be understood that the effects of the present invention are not limited to the above effects and include all effects that can be deduced from the detailed description of the present invention or the configuration of the invention described in the claims.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a flow diagram of a bioreactor system for biomass treatment according to an embodiment of the present invention.
2 is a perspective view illustrating a swash plate according to an embodiment of the present invention.
3 is a right side view showing a side surface of a swash plate according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "indirectly connected" . Also, when an element is referred to as "comprising ", it means that it can include other elements, not excluding other elements unless specifically stated otherwise.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a flow diagram of a bioreactor system for biomass treatment according to an embodiment of the present invention. In the present specification, the term "reflux water" is collectively referred to as an enriched supernatant, a digestion supernatant, a desalination liquid, etc. produced in the sludge treatment process of the mainstream wastewater treatment system.

1, a counter current water biological treatment system 1 according to an embodiment of the present invention includes an inlet pipe 100, a reflux water storage tank 200, a drum screen portion 210, a reaction tank 1000, A storage tank 700, a membrane tank 800, a drain tank 900, an aeration pump 10, a preliminary chemical tank 20, a culture tank 30, an organic compound storage tank 40, a first backwash tank 50, a second backwash tank 60, and a third backwash tank 70.

According to one embodiment of the present invention, the biological water treatment system (1) for biological water treatment of the reflux water is a biological treatment system for biological treatment of the reflux water branched from the main stream of the wastewater treatment plant to remove various organic substances contained in the reflux water, And denitrification can be performed.

The inflow pipe 100 may flow a counter current branched from the main stream of the wastewater treatment plant. A reflux water storage tank 200 to be described later may be connected to the downstream side of the inflow pipe 100.

The reflux water storage tank 200 may temporarily store the amount of reflux flowing from the inflow pipe 100. The reflux water storage tank 200 includes a stirring device 201 capable of stirring the stored reflux water. A concentration measuring unit (not shown) for measuring the concentration of stored BOD, phosphorus (P) and nitrogen (N) and transmitting the measured concentration information to a control unit (not shown) .

The inflow water is temporarily stored in the inflow water storage tank 200 and then the inflow water is temporarily stored in the inflow water storage tank 200 so that the processing of the drum screen unit 210, the reaction tank 1000, the storage unit 700, the membrane tank 800 and the drain tank 900 Only the amount of reflux that does not exceed the ability can be spilled out.

Thereby, an excessive treatment load is not applied to the biological treatment system 1 of the total counter current.

The drum screen unit 210 is connected to the reflux water storage tank 200 and can remove contaminants contained in the reflux water.

The reaction tank 1000 may be connected to the downstream side of the drum screen unit 210. In addition, since the reaction vessel 1000 has multiple partition walls, the reaction vessel 1000 can be partitioned into several spaces. The multi-partitions may include a swirling portion that allows the swirling water to flow, and the swirling portion may be formed at a position corresponding to the maximum storage level of the reflux water in the multi-partitions and at the bottom of the multi-partitions. In the reaction tank 1000, the counterflow water from which contaminants are removed can be received by the drum screen unit 210. Further, a medium (not shown) formed so that microorganisms can grow on the surface can be accommodated.

On the other hand, the counterflow water and the agitating part for agitating the medium may be included, and the concentration of the received BOD, phosphorus (P), and nitrogen (N) may be measured, And a density measuring unit (not shown) for transmitting the data to a control unit (not shown).

In addition, a sensor unit (not shown) may be included in the reaction tank 1000 to measure the concentration of dissolved oxygen and transmit the measured concentration to the control unit. Preferably, the sensor unit may be an oxidation-reduction potential sensor (ORP sensor). Thus, even if the dissolved oxygen concentration in the reaction tank 1000 is as low as 1 ppm or less, the measurement accuracy is improved.

In one embodiment of the reaction tank 1000, the reaction tank 1000 is divided into three partition walls in FIG.

In other words, the reaction tank 1000 is divided into a first reaction tank 300, a second reaction tank 400, a third reaction tank 500 and a fourth reaction tank 600, and the first to fourth reaction tanks 300 and 400 500, and 600 are partitioned by the first partition 320, the second partition 420, and the third partition 520.

The first reaction tank 300 may include a stirring unit 301, a concentration measuring unit (not shown), and a sensor unit (not shown) for measuring the concentration of dissolved oxygen and transmitting the measured concentration to the control unit. The description of the agitating section 301, the concentration measuring section (not shown), and the sensor section (not shown) are duplicated, and therefore will not be described below.

A first aeration part 310 for supplying a gas may be formed in the lower part of the first reaction tank 300.

The amount of air supplied by the first aeration part 310 depends on the amount of dissolved oxygen concentration in the first reaction vessel 300 measured at the sensor part. The control of the amount of air supplied by the first aerator 310 may be performed by PID control.

One side of the first reaction vessel 300 may have a first partition 320 extending vertically to compartmentalize the second reaction vessel 400, which will be described later. The first partition wall 320 is connected to the first reaction chamber 300 and the second reaction chamber 400 to allow the counterflow water to flow over the opposite direction according to the level of the reflux water treatment capability of the structures connected to the second reaction chamber 400, And a ridge portion 321. The first wall portion 321 may be formed at a position corresponding to the maximum storage level of the counter current in the first partition 320 and at the bottom of the first partition 320. In FIG. 1, the first rising portion 321 is formed at a position corresponding to the maximum storage level of the reflux water in the first partition 320.

The second reaction tank 400 and the third reaction tank 500 are formed in the same manner as the first reaction tank 300, and a description thereof will be omitted.

1, the first rising portion 321 may be formed at a position corresponding to the maximum storage level of the recirculating water in the first partition 320, and the second rising portion 421 and the third The rising portions 521 may be formed at the bottom of the second barrier ribs 420 and the third barrier ribs 520, respectively.

In this way, when the first swinging portion 321, the second swinging portion 421 and the third swinging portion 521 are formed at different positions from each other, the residence time of the reflux water in the reaction tank 1000 is increased , Sufficient organic decomposition, denitrification and denitrification are performed.

The fourth reaction vessel 600 disposed at the rear end of the partitioned portion of the reaction tank 1000 is formed in the same manner as the first reaction vessel 300 and includes a swash plate 630 for preventing the media from flowing or falling . The inclined plate 630 will be described later.

The countercurrent biological treatment system 1 according to one embodiment of the present invention includes a recirculation conduit 640 that recirculates some countercurrent water from the fourth reaction tank 600 to the first reaction tank 300. The opening and closing of the recycling conduit 640 can be controlled according to the concentration measured by the concentration measuring unit (not shown) included in the fourth reaction tank 600. As a result, the organic matter, phosphorus, and nitrogen loads contained in the reflux water can be maintained to meet the target level.

The outer wall of the reaction tank 1000 may also include the overflow portion. In one embodiment, the outer wall 620 includes a rearmost ridge 621 as in FIG. 1, but only the number of counter currents passing through the swash plate 630 can be formed in various positions and shapes that can be overflowed to the storage unit 700. [ As a result, it is more effectively prevented that the media (not shown) received in the reaction tank 1000 are flowed to the storage unit 700.

A storage unit 700 may be formed on the downstream side of the reaction tank 1000 to receive only the amount of the counter current passing through the swash plate 630 and temporarily store the same. The storage unit 700 may be formed to be connected to the reaction tank 1000. The reflux water filtered by the medium is temporarily stored in the storage unit 700 and may be discharged to the membrane tank 800 by a pump operation by a command of a control unit (not shown). At this time, the control unit (not shown) can adjust the amount of outflow water to meet the processing capability level of the membrane tank 800 and the drain tank 900, which will be described later.

The membrane tank 800 is formed to be connected to the storage part 700 and includes a membrane part 820 for preventing microbial outflow in the water flow direction. A concentration measuring unit (not shown), a sensor unit (not shown) and an aeration unit 810 are also included in the membrane tank 800, and a description thereof will be omitted here.

The membrane portion 820 may be an ultrafilter membrane (UF membrane). The ultrafiltration membrane is a polymer separation membrane that uses pressure as an impelling force. It is a membrane that inhibits a polymer substance and a colloidal substance in a solution and transmits water. Thereby, the outflow of microorganisms which can remain in the counter current can be prevented in a secondary manner.

A recirculating conduit 830 may be connected to one side of the membrane tank 800 to recirculate part of the recirculated water contained in the membrane tank 800 back to the first reaction tank 300. The opening and closing of the recirculating conduit 830 can be controlled by a control unit (not shown) according to the concentration measured by a concentration measuring unit (not shown) included in the membrane tank 800. As a result, the organic matter, phosphorus, and nitrogen loads contained in the reflux water can be maintained to meet the target level.

The drain tank 900 may be formed such that the upstream side thereof is connected to the membrane tank 800 and the downstream side thereof is connected to the mainstream inlet. According to the processing capacity of the mainstream, the counterflow water flowing in from the membrane tank 800 can be supplied to the mainstream. That is, the drain tank 900 can function as a buffer by disposing the drain tank 900 in a path for discharging the counter current to the main flow.

The aeration pump 10 includes a first aerator 310, a second aerator 410, a third aerator 510 and a fourth aerator 610 and a membrane tank 800 can supply air to the venting base 810 inside. Depending on the treatment capacity of the counter current water biological treatment system 1 according to an embodiment of the present invention, the aeration pump 10 can be implemented in various numbers and capacities.

The preliminary chemical tank 20 can be connected to the reaction tank 1000 and can store additional chemicals to be added depending on the type of the substances to be treated (organic matter, phosphorus, nitrogen compounds, etc.) Can be supplied to the reaction tank 1000. The preliminary chemical tank 20 may be provided with an agitator 21.

The culture tank 30 may be connected to the reaction tank 1000, and the microorganism may be cultured in the culture tank 30. Specifically, in the culture tank 30, anammox bacteria that perform biological denitrification under anaerobic conditions can be cultured. When the denitrification ability of the reaction tank 1000 is lowered, culture solutions containing anammox bacteria from the culture tank 30 can be supplied into the reaction tank 1000.

The organic compound storage tank 40 may be connected to the reaction tank 1000, may store the denitration organic compounds, and may supply the denitration organic compounds to the reaction tank 1000. The denitration organic compound may be methanol, ethanol or the like.

The first backwash tank 50, the second backwash tank 60 and the third backwash tank 70 may be connected to the membrane portion 820 inside the membrane tank 800. When the bioreactor biological treatment system 1 is operated for a certain period of time, the membrane portion 820 can be occluded by the microorganisms. In this case, the first backwash tank 50, the second backwash tank 60 and the third backwash tank 70 are operated to pressurize the solutions stored in the tanks in the direction opposite to the flow direction of the filtration operation , The membrane portion 820 can be backwashed. Thereby, the filtering ability of the membrane portion 820 can be restored.

According to an embodiment of the present invention, the first backwash tank 50 may be a tank storing a NaOCl compound, the second backwash tank 60 may be a tank storing citric acid, (70) may be a CIP (Clean In Place) tank. In addition, each of the pumps may include stirring devices 51, 61, and 71, respectively.

A microorganism capable of promoting the nitrification reaction of nitrogen in the semi-permeable water can be grown on the surface of the medium accommodated in the reaction tank 1000. Thereby, the concentration of microorganisms in the recirculating water is increased, a biological membrane is formed, and a denitration action is performed.

These media can be classified into fixed-bed media having a specific gravity value lower than that of water and fixed-bed media having a specific gravity value higher than that of water depending on the specific gravity.

According to an embodiment of the present invention, by using the fluidized media, it is possible to maintain the smooth flow of the reflux water, and to effectively perform denitrification of the reflux water.

Preferably, the fluidized media may be activated carbon, plastic biofilm carrier, waste tire processed media, sponge media of polyurethane material, and the like.

FIG. 2 is a perspective view showing a front side of a swash plate according to an embodiment of the present invention, and FIG. 3 is a side view of such a swash plate.

The swash plate 630 will be described with reference to Figs. 2 and 3. Fig.

The swash plate 630 is installed at the rear end of the reaction tank 1000, and can prevent the media overflow.

A frame 631 may be formed on the outer periphery of the swash plate 630. The frame 631 may be formed in the shape of a hexahedron by a metal bar in the shape of a quadrangular prism. A plate 633 having a hole 632 formed inside the frame 631 may be formed.

The holes 632 may be formed to have a smaller diameter than the outer diameter of the medium accommodated in the reaction tank 1000 (see FIG. 1). Thereby, the medium can be prevented from passing through while passing the reflux water, and the media can be prevented from overflowing.

The plate 633 in which the holes 632 are formed can be continuously arranged in multiple layers inside the frame 631. As a result, the overflow of the media is effectively prevented.

Further, the gap portion of the continuously arranged plates 633 may further include a gap holding portion 634 that prevents the plates 633 from moving due to the flow pressure of the counter current. Even if the flow rate increases due to an increase in the flow rate passing through the swash plate 630, the swash plate 630 can always exhibit a constant processing capability without changing the arrangement of the plates 633 with the gap holding portion 634 .

A counterflow water collecting part 635 may be formed on the upper part of the frame 631 and a collecting part bottom plate 635a having a hole 632 formed on the bottom of the counterflow water collecting part 635 may be formed.

In the swash plate 630 according to the embodiment of the present invention shown in FIGS. 2 and 3, the counterflow water passes through the holes 632 of the plate 633 and passes through the holes 632 of the collecting part bottom plate 635a And then through the gates 636.

Further, a water level sensor 637 may be additionally provided. Thereby, the water level at the rear end side of the swash plate 630 is measured, and the sweep amount of the counter current through the swash plate 630 can be adjusted according to the measured water level. Thus, the counter current water biological treatment system 1 can be operated organically, and there is no overloading of some specific configurations that the counter current water biological treatment system 1 includes.

As shown in FIGS. 1 to 3, the swash plate 630 may be disposed at an angle of 25 ° or more and 45 ° or less from the outer wall 620 of the reaction tank 1000.

When the angle is less than 25 degrees, the flow according to the flow pressure applied to the swash plate 630 due to the flow of the counter current flowing from the front side with reference to FIG. 2 becomes excessive. As a result, not only the mechanical strength of the swash plate 630 is lowered but also the efficiency with which the swash plate 630 flows over the swash plate 630 is lowered.

When the angle is greater than 45 degrees, the flow according to the flow pressure applied to the swash plate 630 due to the flow of the reflux water flowing from the rear side with reference to FIG. 2 becomes excessive. As a result, not only the mechanical strength of the swash plate 630 is lowered but also the efficiency with which the swash plate 630 flows over the swash plate 630 is lowered.

Therefore, by arranging the swash plate 630 at an angle of 25 ° or more and 45 ° or less from the outer wall 620 of the reaction tank 1000, the load according to the flow pressure applied at the front side and the rear side of the swash plate 630 can be balanced And the swash plate 630 is stably maintained. Also, the counterflow water flows in a balanced manner from both the front and rear sides of the swash plate 630, and the efficiency of the counter current water treatment is maximized.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

1: Biological treatment system of counter current
100: inlet pipe 200: reflux water storage tank
300: first reaction tank 400: second reaction tank
500: Third Reactor 600: Fourth Reactor
700: storage part 800: membrane tank
900: drain tank

Claims (7)

CLAIMS 1. A bioreactor biological treatment system for biologically treating a bioreactor of a wastewater treatment plant,
An inflow pipe through which the reflux water branching from mainstream flows;
A reflux water storage tank for temporarily storing the reflux water flowing from the inflow pipe;
A drum screen part connected to the reflux water storage tank and removing contaminants contained in the reflux water;
And a stirring portion connected to the downstream side of the drum screen portion and having a plurality of partition walls formed therein for partitioning the reaction space and accommodating media formed therein so that microbes can grow on the surface thereof, ;
A swash plate installed at the end of the reaction tank and preventing the overflow of the medium;
A storage unit for receiving and temporarily storing only the number of reflux passes the swash plate;
A membrane tank connected to the storage unit and including a membrane part for preventing microbial outflow in a water flow direction; And
And a drain tank connected to the membrane tank on the upstream side and connected to the main flow inlet on the downstream side to supply the counterflow water flowing in from the membrane tank according to the treatment capacity of the mainstream,
A counterflow water collecting part is formed on the upper part of the swash plate,
A collecting portion bottom plate on which a hole is formed is formed on a bottom surface of the reflux water collecting portion,
A water level sensor is provided at one side of the reflux water collecting part to regulate the amount of the overflow of the reflux water flowing through the bottom plate of the water collecting part,
A recirculating conduit is formed at one side of the membrane tank for recirculating a part of the recirculated water contained in the membrane tank to the reaction tank,
Characterized in that the swash plate is arranged so as to have an angle of not less than 25 DEG and not more than 45 DEG from the outer wall of the reaction tank and a plate having holes having a diameter smaller than the outer diameter of the medium is continuously arranged. . delete The method according to claim 1,
Wherein the gap portion of the continuously disposed plates further comprises a gap maintaining portion for preventing the plates from moving due to the flow pressure of the reflux water. The method according to claim 1,
Wherein the multi-partitions include an overflow portion that allows the overflow water to flow over,
Wherein the overflow portion is formed at a position corresponding to the maximum storage level of the reflux water in the multi-partitions and at the lowest end of the multi-partitions. The method according to claim 1,
Wherein the reaction tank and the membrane tank are provided with aeration unit for supplying a gas. The method according to claim 1,
A preliminary chemical tank for supplying an auxiliary chemical to the reaction tank according to a component of the reflux water;
A culture tank in which a microorganism is cultured and supplied to the reaction tank; And
Further comprising an organic compound storage tank for supplying the denitration organic compound to the reaction tank. The method according to claim 1,
Further comprising a backwash device for backwashing the membrane portion by supplying a backwash solution to the membrane portion in a direction opposite to the water flow.

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