KR101590142B1 - Apparatus for treating water - Google Patents

Abstract

Disclosed is a water treatment apparatus. According to an embodiment of the present invention, the water treatment apparatus of the present invention comprises: a first treatment part attaching microbubbles on a floc which is an aggregate of impurities and is formed by adding a coagulant into raw water, so as to remove the floc after floating the same above water; a second treatment part filtering out, by means of a separation membrane, the treated water from which the floc is removed in the first treatment part; and a washing water treatment part treating washing water used for washing the separation membrane, by sending the washing water to the first treatment part. In addition, the second treatment part comprises a filtration tank which is equipped with the separation membrane and stores the treated water by introducing the same from the first treatment part. The filtration tank further includes separation membranes and partitions so as to compartmentalize the separation membranes separatively. Furthermore, some of the separation membranes are washed by the washing water, and filtration of the treated water is carried out by the remainder of the separation membrane.

Description

[0001] APPARATUS FOR TREATING WATER [0002]

The present invention relates to a water treatment apparatus for removing impurities contained in raw water, and more particularly, to a water treatment apparatus capable of treating wash water, which has been washed with a separation membrane included in a second treatment unit, to a first treatment unit.

The water treatment apparatus is a device for removing impurities contained in raw water.

In order to remove the impurities contained in the raw water, the impurities are precipitated in the water treatment apparatus, floated on the surface after the impurities are agglomerated, or filtered by the separator.

Among them, the method of removing the impurities from the raw water by allowing the impurities to float on the water surface after the impurities are flocculated is called a dissolved air floating method, and the water treatment apparatus for removing impurities from the raw water by the dissolved air floating method includes a dissolved air floating tank.

In the dissolved air flotation tank, coagulated impurities adhered with fine bubbles float to the surface of the water, and the floating impurities are removed from the raw water by being removed by a skimmer on the surface of the water or by overflowing with raw water.

On the other hand, in a water treatment apparatus including a dissolved air floating tank to increase the removal rate of impurities, treated water from which impurities are removed from the dissolved air floating tank is also filtered by the separation membrane.

In this case, since impurities are accumulated in the separation membrane, the separation membrane must be periodically cleaned with the washing water in order to maintain the filtration performance of the separation membrane.

Conventionally, since the washing water having washed the separation membrane contains relatively many impurities, it can not be used. Therefore, it is discharged to the outside and the impurities are separated through separate concentration process and dehydration process and then discarded.

Therefore, the water used as the washing water is wasted without being reused, and the capacity of the equipment is increased by increasing the load on the equipment for the next process of the water treatment apparatus such as the drainage treatment facility.

The present invention is realized by recognizing at least any one of the above-mentioned conventional needs or problems.

One aspect of the object of the present invention is to treat the separation membrane so as to remove the impurities contained in the wash water.

Another aspect of the object of the present invention is to prevent water from being wasted.

Another aspect of the object of the present invention is to reduce the capacity of the facility for the next process of the water treatment facility, such as the effluent treatment facility.

The water treatment apparatus according to one embodiment for realizing at least one of the above problems may include the following features.

A water treatment apparatus according to an embodiment of the present invention includes: a first treatment unit which floats microbubbles on a floc, which is an aggregate of impurities formed by adding a flocculant to raw water, A second treatment unit for filtering the treated water from which the flocs have been removed in the first treatment unit by the separation membrane; And a washing water processing unit for sending the washing water, which has washed the separation membrane, to the first processing unit for processing; Wherein the filtration tank is provided with a plurality of separation membranes, and the filtration tank is provided with a plurality of separation membranes, each of which is divided into a plurality of separation chambers, And the separation membrane of some of the plurality of separation membranes is cleaned by washing water, and the remaining separation membranes are capable of filtering the treated water.

In this case, the first treatment unit may include a dissolved air floating tank in which flocs with fine bubbles float above the water surface to generate treated water.

The first treatment unit may include a flocculating tank for adding flocculant to the introduced raw water; A flocculating tank in which impurities contained in raw water are flocculated to form flocs; And a contact tank for allowing fine bubbles to adhere to the flocs; As shown in FIG.

In addition, the first treatment unit may include a treated water discharge tank in which the flocs floated in the dissolved air floating tank are introduced and discharged to the outside, and the treated water generated in the dissolved air floating tank is introduced and stored. As shown in FIG.

In addition, the treated water circulation tank at the end of the dissolved air flotation may be provided with a floc discharge channel through which the flocs flow together with the raw water.

The first treatment unit may include an air saturation device that receives the treated water from the treated water discharge tank to dissolve air in the treated water and then supplies the treated water to the contact tank; As shown in FIG.

The second processing unit may further include: a cleaning unit that cleans the separation membrane; And a production water supply pipe having a suction pump is connected to the separation membrane so that the produced water filtered by the separation membrane is discharged to the outside.

The cleaning unit may include a wash water tank in which wash water is stored; A wash water supply pipe connected to the wash water tank and the separator; And a wash water supply pump provided in the wash water supply pipe; . ≪ / RTI >

In addition, the wash water supply pipe is connected to the production water supply pipe and is connected to the separation membrane, and the production water supply pipe and the wash water supply pipe may be respectively provided with a production water supply valve and a wash water supply valve.

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In addition, the filtration tank may be provided with a wash water discharge trap for allowing the discharge water mixed with the wash water stored in the filtration tank to flow to the wash water treatment unit.

The wash water treatment unit may send the drain water mixed with the wash water to the treatment tank stored in the filtration tank included in the second treatment unit to the contact tank included in the first treatment unit.

The washing water treatment unit may include a drain water storage tank through which the drain water is introduced and stored; A drain water supply pipe connected to the drain water storage tank and the contact tank; And the drain water supply pipe.

As described above, according to the embodiment of the present invention, the washing water having washed the separation membrane included in the second treatment section can be sent to the first treatment section to remove impurities.

Further, according to the embodiment of the present invention, water may not be wasted.

Moreover, according to the embodiment of the present invention, it is possible to reduce the capacity of the facility for the next process of the water treatment apparatus such as the drainage treatment facility.

1 is a plan view of an embodiment of a water treatment apparatus according to the present invention.
2 is a cross-sectional view taken along line A-A 'in Fig.
3 is a cross-sectional view taken along the line B-B 'in Fig.
Figs. 4 to 7 are views showing the operation of the embodiment of the water treatment apparatus according to the present invention, Figs. 4 and 5 are sectional views as in Fig. 2 showing the case where the separation membrane is not cleaned and the case where it is cleaned, FIG. 7 is a plan view of FIG. 1 and a cross-sectional view of FIG. 3 showing that some of the separation membranes are cleaned and the remaining separation membranes are filtrated.

In order to facilitate understanding of the features of the present invention as described above, the water treatment apparatus according to the embodiment of the present invention will be described in detail.

Hereinafter, exemplary embodiments will be described based on embodiments best suited for understanding the technical characteristics of the present invention, and the technical features of the present invention are not limited by the illustrated embodiments, It is to be understood that the present invention may be implemented as illustrated embodiments. Therefore, it is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. In order to facilitate understanding of the embodiments to be described below, in the reference numerals shown in the accompanying drawings, among the constituent elements which perform the same function in each embodiment, the related constituent elements are indicated by the same or an extension line number.

FIG. 1 is a plan view of an embodiment of a water treatment apparatus according to the present invention, FIG. 2 is a sectional view taken along line A-A 'of FIG. 1, and FIG. 3 is a sectional view taken along line B-B' of FIG.

4 and 6 are views showing the operation of an embodiment of the water treatment apparatus according to the present invention, Figs. 4 and 5 are sectional views as shown in Fig. 2 showing the case where the separation membrane is not cleaned and the case where it is cleaned, 6 and 7 are a plan view of FIG. 1 and a cross-sectional view of FIG. 3 showing that some of the separation membranes are cleaned and the remaining separation membranes are filtrated.

One embodiment of the water treatment apparatus according to the present invention may include a first treatment unit 200, a second treatment unit 300, and a wash water treatment unit 400 as shown in FIGS.

In the first treatment section 200, fine bubbles are adhered to a floc, which is an aggregate of impurities formed by adding an aggregating agent to raw water, and floated on the water surface and then removed.

For this purpose, the first processing unit 200 may include a dissolved air floating tank 210. As shown in FIGS. 4 and 5, in the dissolved air floating tank 210, flocs with fine bubbles float above the water surface to produce treated water not containing flocs.

In addition to the above-described dissolved air floating tank 210, the first processing unit 200 may further include a flocculation tank 220, a flocculation tank 230, and a contact tank 240 as shown in FIGS. 1 and 2 .

The flocculating tank 220, the flocculating tank 230, and the contact tank 240 are provided in order before the dissolved air floating tank 210.

The flocculation tank 220 is connected to a raw water supply source (not shown) by a connection pipe (not shown), and raw water to be treated through the connection pipe flows into the flocculation tank 220. In the flocculation tank 220, a flocculant is added to the raw water. The addition of the flocculant to the flocculent tank 220 is not particularly limited, and any known method may be employed, such as manually adding the flocculant to the flocculation tank 220 or providing a structure capable of adding the flocculant to the above-mentioned connecting pipe.

The flocculation tank 230 is disposed after the flocculation tank 220 and the raw water to which the flocculant is added flows from the flocculation tank 220. A hole or tube is provided in the partition wall W1 for partitioning the flocculation tank 230 and the flocculation tank 220 so that the raw water to which the flocculant is added can flow from the flocculation tank 220 to the flocage tank 230 have.

However, the water level of the raw water contained in the flocculation tank 220 may be higher than that of the partition wall W1 so that raw water to which the flocculant has been added may flow into the flocculation tank 230 from the flocculation tank 220, And the floor surface are spaced apart from each other by a predetermined distance, raw water to which the flocculant is added may be introduced into the flocculation tank 230.

In the floc forming tank 230, impurities contained in the raw water are flocculated by the flocculant to form floc.

The contact tank 240 is disposed between the floc forming tank 230 and the dissolved air floating tank 210. In the contact tank 240, raw water having flocs is introduced from the floc forming tank 230. As shown in FIG. 2, the lower end of the partition wall W2 separating the floc forming tank 230 and the contact tank 240 is spaced apart from the bottom surface by a predetermined distance to form a flock as shown in FIGS. 4 and 5 The raw water can be introduced into the contact tank 240.

However, the raw water on which the flock has been formed may also flow into the contact tank 240 with the other constitution described above.

In the contact tank 240, fine bubbles adhere to the flocs formed on the raw water. The microbubbles may be directly supplied to the contact tank 240 by a microbubble feeder (not shown) so that the microbubbles adhere to the flocs. As will be described later, the treated water in which the air is dissolved is supplied to the microbubble generating nozzles 264 To the contact tank 240 so that fine bubbles adhere to the flocs.

When minute bubbles are adhered to the flocs included in the raw water as described above, flocs having fine bubbles are floated above the water surface by buoyancy as shown in Figs. 4 and 5.

The partition wall W3 partitioning the contact tank 240 and the dissolved air floating tank 210 may be located below the water surface. The upper portion of the partition wall W3 may be inclined toward the dissolved air floating tank 210 toward the upper side.

Accordingly, as shown in FIGS. 4 and 5, the flocs with fine bubbles float above the water surface and can move to the dissolved air floating tank 210.

Floc with fine bubbles floats on the surface of the dissolved air floating tank 210 and there is treated water not containing flocs in the lower part of the floating air floating tank 210.

The second processing unit 200 may further include a treated water discharge tank 250. The treated water outlet tank 250 is disposed between the dissolved air floating tank 210 and the second processing unit 300. In the treated water tank 250, flocs floating on the surface of the dissolved air floating tank 210 together with the raw water are discharged to the outside.

For this purpose, the treated water outlet tank 250 at the end of the dissolved air floating tank 210 may be provided with a floc discharge channel 251. Floc outlet channel 251 may be provided at the upper end of treated water outlet tank 250 as shown in FIG. 5, when the level of the dissolved air floating tank 210 is higher than that of the floe discharge channel 251, the flocs floated on the surface of the dissolved air floating tank 210 together with the raw water, Flows into the floc discharge channel 251 beyond the flotation pipe 210.

Thus, the flock that flows into the floc discharge channel 251 together with the raw water flows along the floc discharge channel 251 and is discharged to the outside. Thus, the flocculated flocculant contained in the raw water can be removed from the dissolved air floating tank 210.

In addition, flocs floating in the dissolved air floating phase 210 may be removed from the dissolved air floating tank 210 by a skimmer (not shown) or the like.

In the treated water outlet tank 250, the treated water also flows from the dissolved air floating tank 210 and is stored. 2, the treated water supply tank 250 is connected to the treated water discharge tank 250 such that the treated water not containing flocs is introduced into the treated water discharge tank 250 at a lower portion of the dissolved air floating tank 210, (Not shown).

The partition wall W4 separating the dissolved air floating tank 210 and the treated water discharge tank 250 is spaced apart from the bottom surface by a predetermined distance so that the treated water can be discharged from the dissolved air floating tank 210 to the treated water discharge tank 250, As shown in FIG.

The second processing unit 200 may further include an air saturation device 260. In the air saturator 260, the treated water is supplied from the treated water outlet tank 250 to dissolve the treated water and then supplied to the contact tank 240.

The air saturation device 260 may include a process water supply pipe 261, an air saturator 262 and a process water supply pump 263 as shown in Fig.

The process water supply pipe 261 is connected to the contact tank 240 and the process water discharge tank 250. 2, one end of the treated water supply pipe 261 is immersed in raw water containing flocs existing in the contact tank 240, and the other end of the treated water supply pipe 261 is immersed in the treated water discharge tank 261. [ Can be immersed in the treated water stored in the storage tank (250).

The air saturator 262 is provided in the process water supply pipe 261. The air saturator 262 dissolves air in the treated water flowing through the treated water supply pipe 261. The constitution of the air saturator 262 for dissolving air in the treated water is not particularly limited, and any well-known constitution is possible as far as the air can be dissolved in the treated water.

The process water supply pump 263 is provided in the process water supply pipe 261. When the treated water supply pump 263 is operated, a part of the treated water stored in the treated water discharge tank 250 flows into the treated water supply pipe 261 as shown in FIGS.

Then, the treated water flowing through the treated water supply pipe 261 flows into the air saturator 262 to dissolve the air. Thus, the treated water in which the air is dissolved in the air saturator 262 is supplied to the contact tank 240 through the treated water supply pipe 261. For this purpose, a fine bubble generating nozzle 264 is provided at one end of the treated water supply pipe 261 immersed in the contact tank 240. Then, the treated water in which air is dissolved is supplied to the contact bath 240 through the fine bubble generating nozzle 264 to form fine bubbles.

In the second treatment unit 300, the treated water in which the flocs are removed in the first treatment unit 200 is filtered by the separation membrane 311. The second processing unit 300 may include a filtration tank 310 and a cleaning unit 320.

In the filtration tank 310, the treated water is introduced from the first treatment unit 200 and stored. The filtration tank 310 is disposed after the treated water outlet tank 250 of the first treatment unit 200, that is, the first treatment unit 200. As shown in FIGS. 2 and 3, a treatment water inlet 317 is provided at an upper portion of the filtration tank 310.

4 and 5, when the water level of the treated water stored in the treated water discharge tank 250 becomes higher than the treated water inlet 317, the treated water in the treated water discharge tank 250 is discharged to the treated water inlet And flows into the filtration tank 310 through the filter 317.

The filtration tank 310 is provided with a separation membrane 311 for filtration of the treated water. The separation membrane 311 may be a microfiltration membrane or an ultrafiltration membrane. Further, the separation membrane 311 can be immersed in the treated water stored in the filtration tank 310.

However, the separation membrane 311 is not particularly limited and any well-known separation membrane can be used as long as it can filter the treated water.

A production water supply pipe 312 may be connected to the separation membrane 311. The production water supply pipe 312 may be connected to the upper portion of the separation membrane 311. The production water supply pipe 312 may be provided with a suction pump 313.

Accordingly, when the suction pump 313 is operated, the treated water stored in the filtration tank 310 flows into the separation membrane 311 and is filtered while passing through the separation membrane 311 to be produced. The produced water is discharged from the upper part of the separation membrane 311 to the outside through the production water supply pipe 312.

As shown in FIGS. 1 and 3, a plurality of separation membranes 311 may be provided in the filtration tank 310. The filtration tank 310 may be provided with a partition 315 for partitioning the plurality of separation membranes 311.

6 and 7, the separation membrane 311 of some of the plurality of separation membranes 311 is cleaned by the washing water, and the remaining separation membrane 311 is used to filter the treated water .

The sludge discharge pipe 325 may be connected to the filtration tank 310 as shown in FIG. The sludge discharge pipe 325 may be connected to the lower portion of the filtration tank 310. The sludge discharge pipe 325 may be provided with a sludge discharge valve 326.

Thus, when the sludge discharge valve 326 is opened, the sludge accumulated in the lower portion of the filtration tank 310 is discharged to the outside through the sludge discharge pipe 325 while the separation membrane 311 is cleaned by the washing water.

On the other hand, in the process oil feeding inlet 317 for allowing the treated water of the dissolved air floating tank 210 to be supplied to the filtration tank 310, an opening / closing device for stopping the supply of the treated water when washing the separation membrane 311 with chemicals Not shown) may be provided.

As shown in FIG. 2, the filtration tank 310 may be provided with a washing water discharge trough 316. The washing water discharge trough 316 may be provided above the filtration tank 310 below the process water inlet 317.

Accordingly, when the level of the effluent mixed with the washing water having washed the separation membrane 311 in the treated water stored in the filtration tank 310 becomes higher than the washing water discharge trough 316, as shown in FIG. 5, And flows to the washing water treatment section 400 through the plunger 316.

The cleaning unit 320 cleans the separation membrane 311. The cleaning unit 320 may include a wash water tank 321, a wash water supply pipe 322, and a wash water supply pump 323.

The wash water is stored in the wash water tank 321. The washing water stored in the washing water tank 321 is not particularly limited, and any known washing water can be used as long as it can wash the separation membrane 311.

The wash water supply pipe 322 is connected to the wash water tank 321 and the separation membrane 311. A washing water supply pump 323 is provided in the washing water supply pipe 322.

Accordingly, when the wash water supply pump 323 is operated, the wash water stored in the wash water tank 321 flows through the wash water supply pipe 322 and passes through the separation membrane 311 from the upper part to the lower part to wash the separation membrane 311.

On the other hand, the wash water supply pipe 322 may be connected to the production water supply pipe 312 and connected to the separation membrane 311. The production water supply pipe 312 and the wash water supply pipe 322 may be provided with a production water supply valve 314 and a wash water supply valve 324, respectively.

Accordingly, when the wash water supply valve 324 is closed and the production water supply valve 314 is opened, the treatment water flowing into the filtration tank 310 can be filtered by the separation membrane 311 as shown in FIG. Further, as shown in Fig. 5, when the production water supply valve 314 is closed and the wash water supply valve 324 is opened, the separation membrane 311 can be cleaned with the wash water. In this case, the washing water flows from the inside to the outside of the separation membrane 311 as described above, while washing the separation membrane 311.

The second processing unit 300 may further include an air supply unit 330. Air can be supplied to the outside of the separation membrane 311 when the separation membrane 311 is cleaned by the air supply unit 330. To this end, the air supply unit 330 may include an air supply pipe 331, a blower 332, and an air supply valve 333.

The air supply pipe 331 is connected to the lower portion of the separation membrane 311. Further, the blower 332 is connected to the air supply pipe 331. The air supply valve 333 is provided in the air supply pipe 331.

Accordingly, when the air supply valve 333 is opened and the blower 332 is operated, the air is supplied to the separation membrane 311 through the supply pipe 331 to wash the impurities attached to the surface of the separation membrane 311 more smoothly .

In the wash water treatment unit 400, the wash water having washed the separation membrane 311 is sent to the first treatment unit 200 for treatment.

Since the washing water containing impurities is sent to the first processing unit 200 to be treated by washing the separation membrane 311 as described above, the washing water need not be treated in the drain water treatment facility or the like provided separately after the water treatment apparatus 100, This may not be a waste. Further, since the washing water containing impurities is not discharged to the facility for the next process of the water treatment apparatus such as the drainage treatment facility, the capacity of the facility for the next process of the water treatment apparatus such as the drainage treatment facility can be reduced.

The wash water treatment unit 400 can send the drain water containing the wash water to the treatment water stored in the filtration tank 310 of the second treatment unit 300 to the contact tank 240 of the first treatment unit 200.

The wash water treatment unit 400 may include a drain water reservoir 410, a drain water supply pipe 420, and a drain water supply pump 430.

The effluent storage tank 410 receives and stores the discharged water. The effluent storage tank 410 may be disposed after the filtration tank 310 of the second processing unit 300. The filtration tank 310 may be provided with a washing water discharge trough 316 as described above.

When the water level of the washing water washed by the separation membrane 311 is higher than the washing water discharge trough 316, And then flows into the reservoir 410.

The drain water supply pipe 420 is connected to the drainage reservoir 410 and the contact tank 240 of the first processing unit 200. The drain water supply pump 430 is provided in the drain water supply pipe 420.

5, the waste water stored in the drain water storage tank 410 flows to the contact tank 240 of the first processing unit 200 through the drain water supply pipe 420 do.

The drainage water that has flowed into the contact tank 240 of the first processing unit 200 passes through the separation membrane 311 of the second processing unit 300 and the dissolved air floating tank 210 next to the contact tank 240 .

Whereby the wash water contained in the drain water can be treated.

As described above, by using the water treatment apparatus according to the present invention, it is possible to send the washing water, which has washed the separation membrane included in the second treatment section, to the first treatment section to treat the water, The capacity of the equipment for the next process can be reduced.

The water treatment apparatus as described above can be applied to a limited number of configurations of the embodiments described above, but the embodiments may be configured by selectively or in combination of all or some of the embodiments so that various modifications may be made.

100: water treatment apparatus 200: first processing section
210: Dissolved air floating tank 211:
220: Coagulation tank 230: Floc forming tank
240: Contact tank 250: Treated water outlet tank
251: Floc discharge channel 260: Air saturation device
261: process water supply pipe 262: air saturator
263: process water supply pump 264: fine bubble generating nozzle
300: second processing section 310: filtration tank
311: Separation membrane 312: Production water supply pipe
313: Suction pump 314: Produced water supply valve
315: partition wall 316: discharge water discharge tube
317: Process water inlet 320: Cleaning unit
321: wash water tank 322: wash water supply pipe
323: Wash water supply pump 324: Wash water supply valve
325: Sludge discharge pipe 326: Sludge discharge valve
330: air supply unit 331: air supply pipe
332: Blower 333: Air supply valve
400: wash water treatment unit 410: drainage storage tank
420: drain water supply pipe 430: drain water supply pump
W1, W2, W3, W4:

Claims (13)

A first treatment unit for attaching micro-bubbles to a floc which is an aggregate of impurities formed by adding a flocculant to raw water, floating the floc on the water surface, and removing the floc;
A second treatment unit for filtering the treated water from which the flocs have been removed in the first treatment unit by the separation membrane; And
A washing water treatment unit for washing the washing water to send the wash water to the first treatment unit to be treated; / RTI >
Wherein the second processing unit includes a filtration tank in which the treatment water is introduced from the first treatment unit and stored,
The filtration tank is provided with a plurality of separation membranes, and the filtration tank is provided with partition walls for partitioning the plurality of separation membranes,
Wherein the separation membrane of some of the plurality of separation membranes is cleaned by washing water and the remaining separation membrane is filtrated of treated water. The water treatment system according to claim 1, wherein the first treatment portion includes a dissolved air float tank in which floc with fine bubbles floats above the water surface to generate treated water. 3. The apparatus according to claim 2, wherein the first processing unit
An agglomeration tank for adding flocculant to the introduced raw water;
A flocculating tank in which impurities contained in raw water are flocculated to form flocs; And
A contact tank for allowing fine bubbles to adhere to the flocs;
Further comprising: [Claim 4] The method according to claim 3, wherein the first treatment unit comprises: a treated water discharge tank into which the flocs floated in the dissolved air float tank are introduced and discharged to the outside, and the treated water generated in the dissolved air floating tank is introduced and stored; Further comprising: 5. The water treatment system according to claim 4, wherein the treated water discharge vessel at the end of the dissolved air flotation is provided with a floc discharge channel through which the flocs flow together with the raw water. The apparatus according to claim 4, wherein the first processing unit includes: an air saturation device that receives the treated water from the treated water discharge tank to dissolve air in the treated water and then supplies the treated water to the contact tank; Further comprising: The apparatus according to claim 1, wherein the second processing unit
A cleaning unit for cleaning the separation membrane; Further comprising:
And a production water supply pipe having a suction pump is connected to the separation membrane so that the produced water filtered by the separation membrane is discharged to the outside. 8. The washing machine according to claim 7,
A washing water tank in which washing water is stored;
A wash water supply pipe connected to the wash water tank and the separator; And
A wash water supply pump provided in the wash water supply pipe;
. 9. The method according to claim 8, wherein the wash water supply pipe is connected to the production water supply pipe,
Wherein the production water supply pipe and the wash water supply pipe are provided with a production water supply valve and a wash water supply valve, respectively. delete The water treatment apparatus according to claim 7, wherein the filtration tank is provided with a wash water discharge trap for allowing the discharge water mixed with the wash water stored in the filtration tank to flow to the wash water treatment unit. The water treatment system according to claim 1, wherein the wash water treatment unit sends drain water mixed with wash water to treated water stored in a filtration tank included in the second treatment unit to a contact tank included in the first treatment unit. 13. The washing machine according to claim 12,
A drain water storage tank through which the drain water is introduced and stored;
A drain water supply pipe connected to the drain water storage tank and the contact tank; And
A drain water supply pump provided in the drain water supply pipe;
.

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