KR101391177B1 - Re chlorine inserting equipment which including a bag filter and flow/proportion of density naocl generator - Google Patents

Abstract

The present invention relates to a chlorine reinserting facility including a bag filter and a flow/concentration proportional sodium hypochlorite generator which includes a flow meter, a filter housing, and a sodium hypochlorite providing unit. The chlorine reinserting facility is capable of directly inserting a desired amount of a sodium hypochlorite aqueous solution into a water reservoir, thereby preventing the generation of harmful gas from the sodium hypochlorite aqueous solution or the scattering of chlorine inside the sodium hypochlorite aqueous solution.

Description

[0001] The present invention relates to a re-chlorine input apparatus including a flow rate / concentration proportional-to-

The present invention relates to a chlorochlorine input facility including a flow rate / concentration proportional rate generation tank and a bag filter for treating a chlorine purified water from a water purification plant to a reservoir.

At the water treatment plant, the chlorinated water is sent to the various reservoirs. At this time, the reservoir is installed higher than the ground and supplies tap water to each household.

On the other hand, when the purified water is sent to the reservoir via the pipes of several Km to several tens Km, the chlorine contained in the purified water is lost and the reference value of chlorine contained in the purified water is reduced to 0.2 ppm or less .

Further, when the purified water is sent to the reservoir, turbulent substances are generated due to foreign substances such as rust generated in the pipeline due to aging of the circulating pipeline, and the reservoir is periodically cleaned.

In order to solve the above problems, Korean Patent Laid-Open Publication No. 2012-0115661 discloses a filter device comprising a filter filter packaged in a rectangular purified water container, a sand filter, an activated carbon filter, an ion exchange resin filter, The filter and the chlorine sterilizer are arranged as a filter module in parallel with each other in series by a conduit to constitute a plurality of sets of water treatment facilities. Water treatment facilities.

However, since the residual chlorine aqueous solution stored in the conventional chlorine sterilizer generates a toxic gas, a safety manager is required, which makes it difficult for the public to handle.

Further, the residual chlorine aqueous solution stored in the conventional chlorine sterilizer has a problem in that chlorine is scattered when the weather is warmer in the summer, making it difficult to store for a long period of time.

Further, the prior art has a problem that the turbidity material contained in the purified water can not be filtered.

Therefore, it is necessary to develop a variety of recycler input facilities to solve the above-mentioned problems.

Korean Patent Publication No. 2012-0115661 (Oct. 19, 2012)

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method and apparatus for generating sodium hypochlorite in proportion to the flow rate of purified water and residual chlorine, And to provide a chlorochlorine input facility including a generation tank and a bag filter.

Another object of the present invention is to provide a chlorochlorine input facility including a flow rate / concentration proportional rate generation tank and a bag filter capable of filtering turbidity substances contained in purified water supplied from a water purification plant to a reservoir.

The recool chlorination apparatus (1000) including the flow rate / concentration proportional rate generation tank and the bag filter according to the present invention comprises a flow meter (110) for measuring the flow rate of the purified water transferred from the water purification plant (10); An inlet 210 through which the purified water transferred from the flow meter 110 flows, a first circulating tank 220 through which the purified water transferred from the inlet 210 flows, a second circulating tank 220 connected to the first circulating tank 220, A filter tank 230 in which a plurality of bag filters 300 for filtering the turbid substances are installed and a second circulation tank 240 through which the purified water passing through the filter tank 230 is circulated, A filter housing (200) including an outlet (250) through which purified water circulated in the tank (240) flows out to the reservoir (20); And a dilution tank 420 installed between the water supply pump 410 and the dilution tank 510. The dilution tank 420 is connected to the dilution tank 410 through the dilution tank 410, Is supplied to the diluting tank (510) by electrolysis of the purified water and the sodium chloride aqueous solution transferred by the brine pump (430) in the brine tank (30) to the diluting tank (510) to dilute the aqueous sodium hypochlorite solution to the first The dilution pump 420 and the salt water generating tank 520 are connected to each other so that the amount of the salt generated in the sodium chloride generation tank 520 is determined according to the flow rate measured by the flow meter 110, The pump 430 controls the flow rate of the purified water supplied to the sequestering tank 520 and the flow rate of the aqueous sodium chloride solution to control the sodium chloride concentration of the mixed solution and controls the amount of power supplied to the sequestering tank 520, The amount of the salt generated in the secondary salt generation tank 520 And a control panel (530) for regulating the operation of the control panel (530).

The filter housing 200 is formed on the upper side of the first circulation tank 220 and the filter tank 230 is formed on the lower side of the first circulation tank 220, 240) are formed on the lower side of the filter tank (230).

The recool chlorination input facility 1000 is further provided with a communication chamber 260 communicating the inlet 210 and the second communication chamber 240 to the filter housing 200, A safety valve (610) installed and opened / closed by a constant weight pressure transferred from the inlet (210); And sodium hypochlorite supplied to the first circulation tank 220 from the decontamination tank 520 when the safety valve 610 is opened between the first circulation tank 520 and the first circulation tank 220, And a guide side (620) for supplying an aqueous solution to the second circulation tank (240).

The chlorine input facility 1000 further includes a chlorine concentration meter 710 installed in the reservoir 20 for measuring the residual chlorine concentration of purified water stored in the reservoir 20. The control panel 530 The control unit controls the dilution pump 420, the saltwater pump 430 and the secondary saltwater generation tank 520 to be generated in the secondary saltwater generation tank 520 when the concentration of the secondary salt of the purified water measured in the chlorine concentration meter 710 is lower than a reference value And the sodium hypochlorite aqueous solution containing sodium hypochlorite is additionally supplied to the reservoir (20).

The recooling facility 1000 includes a first deck 810 installed at the inlet 210 or the outlet 250 and having a plurality of first pores 811 for dividing the purified water. And a second hole 821 formed at the outlet 250 or the outlet 250 at a predetermined distance from the first deck 810 to divide the purified water transferred from the first deck 810 Two decks 820. [0033] FIG.

In addition, the re-chlorine input facility 1000 is characterized in that the first bore 811 is formed to have a larger cross-sectional area than the second bore 821.

Accordingly, the chlorine input facility according to the present invention comprises a sodium chloride supply unit for generating sodium hypochlorite in a required amount in proportion to the flow rate of purified water and the residual chlorine concentration and directly supplying the sodium chloride to the reservoir through the filter housing, The sodium hydroxide aqueous solution can be directly introduced into the reservoir by a required amount, so that toxic gas is generated in the sodium hypochlorite aqueous solution or chlorine contained in the aqueous sodium hypochlorite solution can be prevented from scattering.

In particular, the chlorine input facility according to the present invention has the effect of easily filtering the turbidity material contained in the purified water supplied to the reservoir by using the bag filter of the filter housing.

FIG. 1 is a schematic diagram of a chlorination input facility including a flow rate / concentration proportional rate generation tank and a bag filter according to the present invention.
Figure 2 is a schematic view of a first deck and a second deck according to the present invention;

Hereinafter, the technical idea of the present invention will be described more specifically with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the technical concept of the present invention, are incorporated in and constitute a part of the specification, and are not intended to limit the scope of the present invention.

The present invention relates to a chlorine removal facility (1000) including a flow rate / concentration proportional mixing tank and a bag filter for treating a chlorine residue in purified water supplied from a water purification plant (10) to a reservoir (20).

In the direction display of the present invention, the upper side of the drawing is defined as the upper side, and the lower side of the drawing is defined as the lower side.

FIG. 1 is a schematic diagram of a chlorination input facility including a flow rate / concentration proportional rate generation tank and a bag filter according to the present invention.

1, the chlorination input facility 1000 includes a flow meter 110, a filter housing 200, and a sodium chloride supply unit 500, including a flow rate / concentration proportional rate generation tank and a bag filter, according to the present invention. .

The flow meter 110 measures the flow rate of the purified water transferred from the water purification plant 10 and supplies the flow rate to the filter housing 200. At this time, the flow meter 110 may include the electromagnetic flow meter 110, but the present invention is not limited thereto.

The filter housing 200 has a structure for filtering the turbidity material contained in the purified water transferred from the flow meter 110 and includes an inlet 210, a first flow tank 220, a filter tank 230, A bath 240, and an outlet 250, respectively.

The flow of the purified water transferred from the flow meter 110 flows into the inlet 210. At this time, the inlet 210 may be formed in an L shape, and guides the purified water transferred from the flow meter 110 to the inside of the filter housing 200.

The first flow-through tank 220 is formed in the upper portion of the filter housing 200 and communicates with the upper end of the inlet 210 to flow purified water from the inlet 210.

The filter tank 230 is formed below the first circulation tank 220 and communicates with the lower side of the first circulation tank 220. The turbidity of the turbidity contained in the purified water transferred from the first circulation tank 220 A plurality of bag filters (300) for filtering the material are installed.

The bag filter 300 refers to a filter that filters turbidity materials contained in purified water by a fine bag-like filter material such as glass fibers, cotton, wool, synthetic fibers, and asbestos.

The bag filter 300 has a very low cost feature.

Accordingly, the filter housing 200 according to the present invention can remove the turbidity material contained in the purified water by using the bag filter 300, which is relatively inexpensive, so that the turbidity material contained in the purified water can be easily removed at low cost There is an advantage.

The filter 230 may further include a bag filter 300, a sediment filter, a free carbon filter, a reverse osmosis membrane filter, a hollow fiber membrane filter, a deionization filter, a nanofilter, and a nanofiber filter.

The sediment filter serves to adsorb and remove solid matters such as suspended solids, sand, etc. contained in the purified water.

The free carbon filter serves to remove chemical substances and residual chlorine components that are harmful to the human body such as volatile organic compounds, carcinogens, synthetic detergents, insecticides, etc. contained in the purified water by the adsorption method of activated carbon.

The reverse osmosis membrane filter removes minute organic / inorganic substances such as bacteria and heavy metals and other metal ions contained in the purified water through the membrane having fine pores.

The hollow fiber membrane filter is a porous filter having pores having a size of several tens to several hundred nanometers (nm). It removes contaminants contained in purified water through numerous micropores distributed on the membrane surface.

The deionization filter lowers the total dissolved solids contained in the purified water. That is, the deionization filter may be configured to remove (separate from the purified water) the dissolved solid matter (ion material) contained in the purified water by a power source applied to the anode and the cathode.

The nanofilter can treat several hundreds to thousands of molecules in the middle range between the reverse osmosis membrane filter and the ultrafiltration filter. It can remove bacteria, bacteria, viruses and other bacteria by filtration of bacteria, bacteria, and bivalent cations. Do.

The nanofiber filter is made of a nano fiber and is capable of filtering out minerals, organic materials, metals, bacteria, DNA, viruses, etc., and it is possible to treat nanoparticles of micron size to nanoparticles . Particularly, since the nanofiber filter has not only a small pore size but also an electric charge, the nanofiber filter has excellent performance in removing bacteria and viruses. Furthermore, in addition to the above-mentioned superior water purification ability, the nanofiber filter has a high flow rate that can be treated as compared with the reverse osmosis membrane filter, so that it can process a large amount of water in a short time, and the concentrated water can not be discharged.

The second flow-through tank 240 is formed below the filter tank 230 and flows through the filter tank 230.

The outlet 250 is communicated with the second circulation tank 240 and the purified water transferred from the second circulation tank 240 is discharged to the reservoir 20.

The sodium chloride supply unit 500 includes a dilution tank 510, a decontamination tank 520, and a control panel 530 to supply sodium hypochlorite aqueous solution to the filter housing 200.

The purified water circulated in the second circulation tank (240) is introduced into the dilution tank (510) by the water supply pump (410).

The decontamination tank 520 is connected to the drain pump 500 through a dilution pump 420 installed between the water supply pump 410 and the dilution tank 510 and the purified water introduced from the saltwater tank 30 through the saline pump 430, (Sodium hypochlorite) produced by electrolysis of an aqueous solution, that is, sodium chloride (sodium hypochlorite) is supplied to the dilution tank 510 to supply an aqueous sodium hypochlorite solution diluted therein to the first circulation tank 220.

At this time, the electrode reaction occurring in the decontamination tank 520 is as follows.

<Anode reaction>

2Cl ^2- 2e → Cl ₂

2H ₂ O - 4e? 4H ⁺ + O ₂

<Cathode reaction>

Na + 2e? 2Na

₂ Na + 2H ₂ O? NaOH + H _2?

<Mixed Reaction>

NaOH + Cl _{2 -} > NaOCl + HCl

<Total reaction>

NaCl + H ₂ O -> NaOCl (sodium hypochlorite) + H ₂ ↑ (gas)

The sodium hypochlorite aqueous solution supplied to the first flow-through tank 220 flows through the bag filter 300, the second flow-through tank 240, and the outlet 250 together with the purified water flowing in the first flow- And then supplied to the reservoir 20.

The control panel 530 controls the flow rate of the dilution pump (not shown) so that the amount of sodium chloride generated in the sodium chloride generation tank 520 is determined according to the flow rate measured by the flow meter 110 and supplied to the first circulation tank 220 420 controls the flow rate of the purified water supplied to the sequestering tank 520 and the flow rate of the sodium chloride aqueous solution supplied to the sequestering tank 520 from the saltwater pump 430 to adjust the concentration of sodium chloride in the mixed solution, And controls the amount of electricity supplied to the secondary salt generation tank 520 to control the amount of secondary salt generated in the secondary salt generation tank 520.

For example, assuming that the flow rate of the purified water measured by the flow meter 110 is 100 t / h and the amount of the salt to be introduced into the reservoir 20 is 0.5 ppm, mg / l * 1000l / 1t * 1g / 1000mg = 60g / h. That is, 60 g of perchlorate per hour is injected.

At this time, the amount of negative charge generated in the negative charge generation tank 520 is proportional to the amount of power supplied to the negative charge generation tank 520.

For example, if 3 W of electric power is required to produce 1 g of residual chlorine, the control panel 530 supplies 180 W of power to the decontamination tank 520.

At this time, the control panel 530 controls the dilution pump 420 and the brine pump 430 to adjust the purified water supplied to the decontamination tank 520 and the supplied amount of the aqueous sodium chloride solution, respectively.

At this time, if water and an aqueous solution of sodium chloride are supplied to the decontamination tank 520 without controlling the dilution pump 420 and the saltwater pump 430,

When the amount of sodium chloride generated in the sodium chloride generation tank 520 is small, sodium chloride contained in the aqueous sodium chloride solution passes through the sodium chloride generation tank 520 as it is,

The sodium chloride contained in the aqueous sodium chloride solution is insufficient to generate the secondary salt properly. Therefore, when the dilution pump 420 is operated using the control panel 530, And the brine pump 430 are controlled as described above.

Accordingly, the chlorination input facility 1000 according to the present invention generates sodium hypochlorite in a required amount in proportion to the flow rate of the purified water and the residual chlorine concentration, and directly supplies sodium hypochlorite to the reservoir 20 through the filter housing 200 And the supply part 500, it is possible to directly introduce the sodium hypochlorite aqueous solution into the reservoir 20 by a necessary amount so that toxic gas is generated in the sodium hypochlorite aqueous solution or chlorine contained in the aqueous sodium hypochlorite solution is scattered There is an effect that can be prevented.

Particularly, the recool chlorination facility 1000 according to the present invention has an effect of easily filtering the turbidity material contained in the purified water supplied to the reservoir 20 by using the bag filter 300 of the filter housing 200 have.

The recool chlorination input facility 1000 including the flow rate / concentration proportions screening generation tank and the bag filter includes a communication tank 260 for communicating the inlet 210 and the second circulation tank 240 to the filter housing 200 And may further include a safety valve 610 and a guide side 620.

The safety valve 610 is installed in the communication chamber 260 and is opened / closed by a constant weight pressure transferred from the inlet 210.

The communication chamber 260 may be installed at the center of the filter housing 200.

The safety valve 610 is configured such that when the purified water flowing through the first flow-through tank 220 and the aqueous sodium hypochlorite solution are stagnated without passing through the filter tank 230, And guiding the purified water transferred from the inlet 210 to the second circulation tank 240. The circulation system of the present invention is not limited thereto.

That is, the safety valve 610 prevents the purified water circulating in the first circulation tank 220 from being stagnated without passing through the filter tank 230 and stopping the supply of the purified water to the reservoir 20 .

The safety valve 610 may be configured as a spring safety valve that blows fluid when the pressure exceeds the set pressure.

The guiding side 620 is installed between the main supply tank 520 and the first main tank 220 so that when the main valve 610 is opened, And supplies the sodium hypochlorite aqueous solution to the second flow-through tank 240.

That is, in the safety valve 610, the purified water circulated in the first circulation tank 220 is stagnated without passing through the filter tank 230, and the supply of the sodium hypochlorite aqueous solution to the reservoir 20 is stopped .

Also, the filter housing 200 may have an opening / closing cap 270 to open / close the upper portion thereof.

Accordingly, the filter housing 200 can easily replace the bag filter 300 installed in the filter tank 230 using the opening / closing cap 270.

Hereinafter, an experimental example of the residual chlorine aqueous solution supply unit according to the present invention will be described.

<Experimental Example>

When the flow rate of the purified water measured by the flow meter 110 is 100 t / h and the amount of residual chlorine to be introduced into the reservoir 20 is 0.5 ppm, the amount of residual chlorine actually required is 100 t / h * 0.6 mg / l * 1000l / 1t * 1g / 1000mg = 60g / h. That is, 60 g of residual chlorine should be generated per hour.

That is, 60 g of residual chlorine should be generated per hour in the halide generation tank 520. Therefore, by using the control panel 530, the amount of electric power supplied to the screening tank 520 is adjusted to about 180W.

In addition, 7.2V / 25A is applied to the decontamination tank 520, and the amount of water supplied to the decontamination tank 520 and the aqueous solution of sodium chloride are supplied using the dilution pump 420 and the saltwater pump 430.

At this time, the supply amount of the sodium chloride aqueous solution is controlled at a rate of 180 ml per hour, the supply amount of water is 1.5 l per hour, and the amount of the effective chlorine is adjusted to about 60 g / h.

The experimental results are shown in Table 1 below.

Category \ Number One 2 3 4 5 Power Supply (Wh) 94 184 271  361 446 (25%) (ml / hr) of aqueous sodium chloride solution 93 182 272 360 448 Water supply (L / hr) 0.77 1.56  2.25 3 3.74 Residual chlorine production (g / hour) 29 60 92 121  152

As shown in Table 1, it is confirmed that the amount of residual chlorine generated in the secondary salt generation tank 520 is proportional to the amount of power supplied to the secondary salt generation tank 520, the supply amount of aqueous sodium chloride solution, and the water supply amount, respectively .

That is, by controlling the proportional relation and the control panel 530 to control the amount of power supplied to the decontamination tank 520, the amount of supplied sodium chloride solution, and the amount of purified water, the amount of decontamination supplied to the reservoir 20 is controlled You can.

Conventionally, there has been a disadvantage in that a manager needs to supply a residual chlorine aqueous solution stored in a container disposed near the reservoir 20 directly to the reservoir 20 as needed to store a manager and a residual chlorine aqueous solution.

However, the recool chlorination input facility 1000 including the flow rate / concentration proportions screening generation tank and the bag filter according to the present invention may use the control panel 530 to control the power supply amount supplied to the screening tank 520, the sodium chloride aqueous solution supply amount And the amount of purified water supplied to the reservoir 20 is controlled by directly controlling the amount of purified water supplied to the reservoir 20 so that there is no need for a separate manager and a container storing the aqueous sodium chlorate solution.

The chlorine removal facility 1000 including the flow rate / concentration proportional rate generation tank and the bag filter is installed in the reservoir 20 and is connected to a chlorine concentration meter 710 for measuring the concentration of residual chlorine stored in the reservoir 20 The saltwater pump 430 and the decontamination tank 520 when the concentration of the decontamination water of the purified water measured by the chlorine concentration meter 710 is lower than a reference value, So that the sodium hypochlorite aqueous solution containing the secondary salt generated in the secondary salt generation tank 520 can be additionally supplied to the secondary storage 20.

That is, the residual chlorine concentration of the purified water stored in the reservoir 20 is always controlled to be maintained above the reference value.

2 is a schematic view of a first deck and a second deck according to the present invention;

2, the present invention may further include a first deck 810 and a second deck 820. [

The first deck 810 is installed at an inlet 210 or an outlet 250 of the filter housing 200 to divide the integer.

The second deck 820 is spaced apart from the first deck at an inlet 210 or an outlet 250 of the filter housing 200 to divide the purified water transferred from the first deck 810 .

At this time, the first bore 811 may be formed to have a larger cross-sectional area than the second bore 821.

Accordingly, the first deck 810 and the second deck 820 uniformly divide the purified water flowing into the inlet 210, so that the turbidity material contained in the purified water in the filter tank 230 There is an effect of maximizing the speed of filtering the bag filter 300,

By dividing the purified water flowing out to the outlet 250, the purified water can be mixed with the residual chlorine aqueous solution more quickly in the reservoir 20.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10: Water Treatment Plant
20: Reservoir
30: Brine tank
1000: Recycler input facility
110: Flowmeter
200: Filter housing
210: inlet
220: 1st distribution box
230: Filter tank
240: Second distribution box
250: Outlet
260:
300: Bag filter
410: Feed pump
420: Dilution pump
430: brine pump
500:
510: diluting tank
520:
530: Control panel
610: Safety switch
620: The guide side
710: Chlorine concentration meter
810: First deck
811: 1st pier
820: Second deck
821: 2nd pier

Claims (6)

A flow meter 110 for measuring the flow rate of the purified water transferred from the water purification plant 10;
An inlet 210 through which the purified water transferred from the flow meter 110 flows, a first circulating tank 220 through which the purified water transferred from the inlet 210 flows, a second circulating tank 220 connected to the first circulating tank 220, A filter tank 230 in which a plurality of bag filters 300 for filtering the turbid substances are installed and a second circulation tank 240 through which purified water passes through the filter tank 230, A filter housing (200) including an outlet (250) through which purified water circulated in the filter (240) flows out to the drainage (20); And
A dilution tank 510 into which the purified water circulated in the second circulation tank 240 is introduced by the water supply pump 410 and a dilution pump 420 installed between the water supply pump 410 and the dilution tank 510 The inflow water and the secondary salt produced by electrolysis of the sodium chloride aqueous solution transferred by the salt water pump 430 in the salt water tank 30 are supplied to the dilution tank 510 to dilute the sodium hypochlorite aqueous solution to the first distribution A dilution pump 420 and a brine pump 420 are connected to the main tank 220 to supply the diluted pump 420 and the dilution pump 420 to the main tank 200, The sodium chloride concentration of the mixed solution is controlled by controlling the flow rate of the purified water supplied to the sequestering tank 520 and the flow rate of the sodium chloride aqueous solution at the step 430 to control the amount of power supplied to the sequestering tank 520, The amount of the salt generated in the generation tank 520 And a decontamination supply unit (500) including a control panel (530) for discharging the chlorinated water.
The filter according to claim 1, wherein the filter housing (200)
The first flow channel 220 is formed on the upper side and the filter tank 230 is formed on the lower side of the first flow channel 220 and the second flow channel 240 is formed on the filter tank 230, The chlorine removal device (1000) including the flow rate / concentration proportional rate generation tank and the bag filter,
The recollector of claim 2, wherein the recycler input facility (1000)
A communication chamber 260 is formed in the filter housing 200 to communicate the inlet 210 and the second flow-through tank 240,
A safety valve (610) installed in the communication chamber (260) and opened / closed by a constant weight pressure transferred from the inlet (210);
When the safety valve 610 is opened between the decontamination tank 520 and the first circulation tank 220 and the sodium chloride hypochlorite solution supplied from the decontamination tank 520 to the first circulation tank 220 And a guide side (620) for supplying the second chlorine gas to the second circulation tank (240).
The recollector of claim 1, wherein the recycler input facility (1000)
And a chlorine concentration meter (710) installed in the reservoir (20) for measuring the residual chlorine concentration of the purified water stored in the reservoir (20)
The control panel 530 controls the dilution pump 420, the saltwater pump 430 and the garlic generation tank 520 to control the dilution pump 420, the saltwater pump 430 and the garlic generation tank 520, And the sodium hypochlorite aqueous solution containing sodium hypochlorite produced in the electrolytic cell (520) is further supplied to the reservoir (20).
The recollector of claim 1, wherein the recycler input facility (1000)
A first deck 810 installed at the inlet 210 or the outlet 250 and having a plurality of first perforations 811 for dividing the purified water; And
A second hole 821 is formed in the outlet 250 or the outlet 250 spaced apart from the first deck 810 by a predetermined distance to divide the purified water transferred from the first deck 810, And a deck (820) disposed between the flow rate / concentration proportional mixing tank and the bag filter.
[6] The apparatus according to claim 5,
Wherein the first perforations (811) are formed to have a larger cross-sectional area than the second perforations (821).

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