KR101530685B1 - Method for blending of cleaning waste fluid and apparatus using the same - Google Patents

Abstract

The present invention relates to a method for blending cleaning waste fluid, and a desalinizing apparatus using the same. The desalinizing apparatus according to the present invention comprises: a preprocessing unit (130) filtering obtained seawater, and a high pressure membrane filtering unit in which the seawater filtered by the preprocessing unit (130) flows. Additionally, the desalinizing apparatus comprises: a waste liquid storage tank (500) in which the cleaning waste fluid is flown from the preprocessing unit (130) and the high pressure membrane filtering unit; and a blending processing unit in which concentrated water released from the high pressure membrane filtering unit and the cleaning waste fluid released from the waste liquid storage tank (500) are flown and blended. The blending processing unit (400) discharges the mixed water blended with the concentrated water and the cleaning waste fluid. Therefore, by discharging the cleaning waste fluid after being blended with the concentrated water generated during a maintenance cleaning process of the preprocessing unit and the high pressure membrane filtering unit, equipment managing costs and additionally injected chemicals can be saved, and environmental issues are not caused even when releasing the water to the sea without a neutralizing process.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for blending cleaning wastewater,

The present invention relates to a cleaning waste solution blending method and a seawater desalination apparatus using the same, and more particularly, to a washing waste solution blending method using a washing waste solution generated in a washing process using a chemical agent of a seawater desalination process using a high- To a concentrated water blending method in which the water is adjusted by dischargeable water quality by blending with concentrated water, and a seawater desalination apparatus using the same.

In recent years, techniques for desalination have been studied in order to solve the problem of depletion of water resources, and seawater desalination is a method of removing salinity-containing solutes from seawater which is difficult to use directly for domestic water, agricultural water or industrial water, Drinking water, domestic water, agricultural water or industrial water.

Particularly, research and development of a high-pressure membrane filtration process using reverse osmosis (RO) among many processes used in a seawater desalination apparatus is actively under way.

A related art will be described with reference to FIG. 1 attached hereto.

In a commonly used seawater desalination apparatus, seawater is introduced into the electrostatic processing unit 110, the A / S unit 120, the preprocessing unit 130 and the C / F unit 140 to perform filtration or the like, The concentrated water generated in this process is discharged to the ocean, and the sludge and the backwash water discharged from the pretreatment process and the pretreatment process are discharged to the RO And discharged.

In particular, in the case of sludge, backwash water, and concentrated water, a large amount of chemicals such as a chlorine agent, a pH adjuster, a flocculant, a reducing agent, and an antiscalant are put into the seawater desalination process in the course of a process operation, Acid, alkaline chelating agent, etc., and the sludge containing them, the backwashing effluent and the washing waste solution must be treated with caution because they need to be carefully treated. Therefore, they are separately collected and treated through concentration, filtration, dehydration and neutralization It was normal.

In order to perform the above-described treatment process of the sludge, the backwash drain water and the washing waste liquid, the backwash water discharge tank 310, the thickener tank 320, the filtration unit 330, (340) and the neutralization tank (350) are additionally required to be additionally installed, there is a problem that not only the initial installation cost but also the operation cost of the apparatus is considerably increased.

Korean Patent Laid-Open Publication No. 2010-0074866 discloses a method for introducing and treating sewage backwash water and sludge generated during the operation of a desalination desalination process by introducing it into a wastewater treatment process using ultraviolet rays.

The method disclosed in the above-mentioned document also requires additional equipment for treating the sludge and the backwashing effluent, and it is obvious that the ultraviolet equipment is expensive, so that it is obvious that the installation cost is excessive.

(Patent Document 1) KR 2010-0074866 A

Disclosure of the Invention The present invention has been conceived in order to solve the problems of the prior art described above, and it is an object of the present invention to provide a method and apparatus for cleaning (chemical backwashing, maintenance chemical cleaning) using chemicals of a pre- , Chemical cleaning), and to discharge the washing waste liquid discharged at the time of chemical cleaning to the concentrated water.

Also, it is an object of the present invention to provide a blending method for efficiently controlling the blending process to discharge mixed water of stable quality.

According to an aspect of the present invention, there is provided a seawater desalination apparatus including: a pretreatment unit for filtering seawater; And a high-pressure membrane filtration unit into which the seawater filtered by the pre-treatment unit 130 flows. In the seawater desalination apparatus, the washing waste discharged from the pre-treatment unit 130 and the high- A waste solution storage tank 500; And a blending processor 400 for introducing and blending the concentrated wastewater discharged from the high-pressure membrane filtration unit and the washing waste discharged from the waste solution storage tank 500, and the blending processor 400 may further include: And the mixed water in which the washing waste liquid is blended is discharged to the outside.

The seawater desalination apparatus includes a pre-treatment unit 110 for flocculating / floating or coagulating / precipitating the collected seawater prior to the pretreatment unit 130; And an A / S unit 120 for screening seawater flowing out of the electrostatic processing unit 110. The washing waste liquid flowing out from the electrostatic processing unit 110 and the A / And the blending processing unit 400 discharges the washing waste liquid flowing out from the waste solution storage tank 500 and the mixed water blended with the concentrated water to the outside.

The blending processing unit 400 blends the sludge discharged from the pre-treatment unit 110 and the A / S unit 120, the backwash drain water discharged from the pre-treatment unit 130, the concentrated water, It is preferable to discharge one mixed water to the outside.

The high-pressure membrane filtration unit is preferably an RO unit 200.

The blending processor 400 may include a blending controller 490 for determining whether to blend according to a preset water quality.

The blending processor 400 may further include a blending sensor S _B connected to the blending controller 490 to sense the quality of the mixed water and the blending controller 490 may control the blending controller It is preferable to compare the water quality of the set mixed water.

It is preferable that the predetermined water quality is at least one of organic matter, inorganic matter, turbidity, electric conductivity, water temperature and pH.

The pH value is preferably in the range of 5.5 to 8.6.

And a C / F unit 140 for filtering the seawater flowing out of the pre-processing unit 130.

The blending processor 400 may further include a storage tank 410 through which the backwash drain water, the sludge, and the washing waste liquid are introduced.

(A) setting a quality of the mixed water to be discharged by the blending control unit 490; (b) discharging the mixed water blended with the concentrated water flowing out of the high-pressure membrane filtration unit through which the seawater is filtered and the washing waste discharged from the waste solution storage tank 500; (c) sensing the quality of the mixed water discharged by the blending sensor (S _B ); (d) comparing the water quality of the sensed mixed water with the water quality of the mixed water set in the blending control unit 490 to determine whether or not the blending process is performed; (e) When it is determined that performing the blending process the blend control 490 (P _W), the waste pump so that the concentration be blended flowing out of the washing waste solution and the high-pressure membrane filtration unit that exits from the waste solution storage tank 500 , And stopping the blending pump (P _B ) or closing the blending valve (V _B ).

If it is determined that the blending process is not performed, the blending control unit 490 may stop the wastewater pump P _w .

If it is determined that the blending process is to be performed, the blending control unit 490 opens the bypass valve installed in front of the storage tank 410 in the direction of the storage tank 410 so that the backwash drainage water, the sludge, (410) in the second step.

(A) setting a quality of the mixed water to be discharged by the blending control unit 490; (b) concentrated water flowing out from the high-pressure membrane filtration unit where seawater is filtered, sludge discharged from the pre-treatment unit 110 and the A / S unit 120, backwashing effluent discharged from the pretreatment unit 130, Discharging the blended mixed wastewater discharged from the washing water tank 500; (c) sensing a quality of the mixed water by a blending sensor (S _B ); (d) comparing the water quality of the sensed mixed water with the water quality of the mixed water set in the blending control unit 490 to determine whether or not the blending process is performed; (e) When it is determined that performing the blending process the blend control 490 (P _W), the waste pump so that the concentration be blended flowing out of the backwash drain water and the high-pressure membrane filtration unit that exits from the pre-processing unit 130 And operating the blending pump (P _B ), or opening the blending valve (V _B ).

If it is determined that the blending process is not performed, the blending control unit 490 may control the sludge discharged from the pre-treatment unit 110 and the A / S unit 120 and the pre- And the waste water pump P _W and the blending pump P _B are stopped or stopped so that the washing water discharged from the waste solution storage tank 500 and the concentrated water flowing out from the high pressure membrane filtration unit are not blended, Closing the blending valve (V _B ).

If it is determined that the blending process is not to be performed, the blending control unit 490 opens the bypass valve installed in front of the storage tank 410 in the direction of the storage tank 410 to remove the backwash water, the sludge, And the waste liquid is introduced into the storage tank 410.

In the step (d), it is preferable that the amount of discharged sludge and backwashing effluent is compared with the discharge amount of the predetermined sludge and backwashing effluent to determine whether or not the blending process is performed.

In the step (e), opening and closing of the blending pump (P _B) and the waste pump operation (P _W) is a number of revolutions of the drive, wherein the blending valve (V _B) is opening and closing of the blending valve (V _B) The amount of the sludge blended with the concentrated water, the backwash drain water, and the washing waste liquid is controlled.

As described above, according to the present invention, in the seawater desalination apparatus, the washing waste liquid generated during the washing process using the chemicals of the pretreatment unit and the high-pressure membrane filtration unit is blended and discharged into the concentrated water, In addition, it does not cause environmental problems because it conforms to the ocean discharge standard even if it discharges to the sea without going through the neutralization process.

1 is a conceptual diagram for explaining a seawater desalination apparatus and a sludge according to the prior art, a method of treating a backwash drainage water and a cleaning waste solution (a shaded portion).
2 is a conceptual diagram for explaining a seawater desalination apparatus and a sludge according to an embodiment of the present invention, a method for treating backwash drainage water and a washing waste liquid (shaded area).
FIG. 3 is a conceptual diagram for explaining a seawater desalination apparatus and a sludge, a method for treating backwash drainage water, and a method for treating a washing waste liquid (shaded portion) according to another embodiment of the present invention.
Fig. 4 is a table showing the discharge allowance criteria for water pollutants (ocean discharge standards).

As used herein, the term "high-pressure membrane filtration" means a membrane filtration section made of high pressure such as NF (nanofiltration) and RO (reverse osmosis). The operating pressure of the high-pressure membrane filtration section is generally about 10 to 85 bar. The membrane used therefor is referred to as a "high-pressure membrane ".

As used herein, the term "concentrated water" refers to water having a salt concentration higher than that of conventional sea water, as effluent discharged from a high-pressure membrane filtration section without filtration, except for produced water treated in a high-pressure membrane filtration section.

As used herein, the term "cleaning waste liquid" refers to a cleaning process of a pretreatment unit and a high-pressure membrane filtration unit, such as CEB (Chemical Enhanced Backwashing), MCC (Maintenance Chemical Cleaning) And the like are discharged from the electrostatic processing unit 110, the pretreatment unit 130, and the high-pressure membrane filtration unit after the cleaning process is completed.

As used herein, "blending " refers to a process of mixing objects of different properties.

As used herein, the term "sludge" refers to sediment that is unfiltered or submerged during the water treatment process, and is generally referred to as sludge when the water content is low and as effluent when the water content is high. .

As used herein, the term "mixed water" refers to water in which a subject having a different nature is mixed by the blending.

Description of Seawater Desalination Apparatus According to the Present Invention

Hereinafter, a seawater desalination apparatus according to the present invention will be described with reference to FIG.

2, the RO process is exemplified as an example of the high-pressure membrane filtration process, but any high-pressure membrane filtration process may be employed.

The present invention can be applied to a general RO process as described with reference to FIG.

The incoming water to be treated is taken up by a water intake pump P ₁₁₀ and selectively processed by the A / S unit 120 and the preprocessing unit 130 via the electrostatic processing unit 110. The membrane filtration process is performed in the RO unit 200 by the high pressure pump P ₂₀₀ through the C / F unit 140 by the booster pump P ₁₄₀ and then through the after treatment unit Production water is produced.

The water to be taken in and taken out by the water intake pump (P ₁₁₀ ) is not particularly limited. Generally, when the TDS concentration is 20000 mg / L or more, sea water, 20000 to 1000 mg / But it is particularly preferable in the case of seawater because it is easy to adjust the water quality to the ocean discharge. In the following, sea water is taken as an example.

The pre-charge processing unit 110 performs primary screening of the inflowed seawater. It may be omitted in some cases. Generally, coagulation / float processes (eg, DAF, dissolved air flotation) or coagulation / precipitation processes can be used.

Also, in the electrostatic processing unit 110, a cleaning process, which will be described later, may be performed periodically using a chemical as the case may be.

The A / S unit 120 is a structure that functions as an auto strainer. The A / S unit 120 performs filtration of seawater by using the pressure of the fluid flowing in the inside and the cyclone principle and detects the pressure difference between the inlet side and the outlet side It performs automatic cleaning and screening function. It may be omitted in some cases.

In the A / S unit 120, a cleaning process, which will be described later, may be periodically performed using a chemical as the case may be.

The pre-processing unit 130 filters the seawater that has passed through the pre-processing unit 110 and the A / S unit 120. Typically used in low pressure membrane filtration processes such as, but not limited to, MF (microfiltration) or UF (ultrafiltration).

However, the material of the membrane constituting the pretreatment unit 130 may be made of metal, polymer, ceramic, or the like.

In the pretreatment unit 130, a cleaning process is periodically performed in order to maintain the throughput. At this time, the pretreatment unit 130 removes the acidic chemicals (sulfuric acid, hydrochloric acid, citric acid, oxalic acid, EDTA etc.), alkaline chemicals (sodium hydroxide, EDTA, Sodium chlorate, NaOCl) is introduced into the waste solution storage tank 500 connected to the pretreatment unit 130 after the washing process is completed.

The C / F unit 140 is a structure that functions as a cartridge filter. The C / F unit 140 includes a flotage filter 130, which is filtered by the preprocessing unit 130 and is finally allowed to remain in the seawater pumped by the booster pump P ₁₄₀ Substances or microorganisms are removed.

The seawater filtered through the electrostatic processing unit 110, the A / S unit 120, the preprocessing unit 130 and the C / F unit 140 is circulated by the high pressure pump P ₂₀₀ , As shown in FIG.

In the RO unit 200, the high-pressure membrane filtration process is performed by the reverse osmosis principle as an example of the high-pressure membrane filtration process. The principle of reverse osmosis is omitted from the description of the principle of filtration process using general technology invar.

However, the RO unit 200 is periodically cleaned in order to maintain the throughput in the same manner as the preprocessing unit 130. At this time, the acidic chemical, the alkaline chemical, and the oxidant are introduced into the RO unit 200, And flows into the waste solution storage tank 500 connected to the RO unit 200.

The waste liquid storage tank 500 receives and stores the cleaning waste liquid flowing out from the pretreatment unit 130 and the RO unit 200. Meanwhile, although not shown. As described above, the cleaning process can also be performed in the electrostatic processing unit 110 and the A / S unit 120. The generated washing waste liquid is also introduced into the waste solution storage tank 500 and stored therein. The stored washing waste solution is supplied to the blending processing unit 400 ).

The blending processing unit 400 is configured to blend and discharge the concentrated water, the backwash drain water, the sludge, and the cleaning waste liquid separately from the conventional method, The sludge discharged from the pre-treatment unit 130, the pre-treatment unit 110 and the A / S unit 120, and the washing waste discharged from the waste-liquid storage tank 500 are blended and discharged, (S _B ), a blending pump (P _B ), and a blending control unit (490).

The blending sensor (S _B ) senses the quality of the mixed water by placing the concentrated water, the backwash water, and the washing waste liquid at the blended mixed water discharge position.

The blending control unit 490 receives the mixed water quality sensed from the blending sensor S _B and compares the received water quality signal with the set water quality to determine whether to perform the blending process.

The predetermined category of the water quality is preferably set to a category set in a water pollutant emission allowance criterion (ocean discharge standard) as shown in the table of FIG. 4, but it is not limited to this and can be set arbitrarily. In this case More preferably at least one of organic matter, inorganic matter, turbidity, electric conductivity, water temperature, and pH.

In addition, the threshold value (reference value) for determining mixing according to the set category may be set according to the marine discharging related laws and, for example, pH value within 5.5 to 8.6 may be preferable.

However, when the water quality of the mixed water to be discharged is determined and set in the blending control unit 490, when the determined water quality is set as it is, the blending sensor S _B exceeds the determined water quality of the mixed water The water quality is set to a value lower than the water quality determined in consideration of this point, for example, about 80 to 95% at the water quality setting time Of course, it can be changed according to the process and operating conditions.

The blending pump P _B is electrically connected to the blending control unit 490 and is operated according to whether or not the blending process is performed in the blending control unit 490 so that the backwashing effluent and sludge are blended in the concentrated water do.

The blending pump (P _B ) preferably includes an inverter to allow the rotation speed to be adjusted.

In another embodiment, the blending control unit 490 blending pump (P _B) in be a blending valve (V _B), instead of installation, the blending valve (V _B) is blended control unit 490 and is electrically connected to the blending control The washing waste liquid, the backwash drain water, and the sludge are blended in the concentrated water.

The waste fluid pump (P _W) is concentrated in the washing waste water flowing out of the blending controller 490 and is electrically connected with, and operating, according to whether to perform the blending process the determination in the blending control unit 490, the waste liquid storage tank (500) It is controlled to be blended.

Further, instead of the waste fluid pump (P _W) is also blended pump, preferably including an inverter to enable the rotational speed control as in the (P _B), not shown, the waste pump (P _W) In a further embodiment, as described above A waste liquid valve (not shown) may be installed.

The blending processing unit 400 may further include a storage tank 410 disposed between the pre-processing unit 130 and the blending pump P _B (or the blending valve V _B ).

While the general blending process is being performed, the backwash drain water, sludge, and washing waste liquid are bypassed without being stored in the storage tank 410, but they do not satisfy predetermined criteria, or the amounts of sludge, backwash drain water, When it is determined that the blending control unit 490 does not perform the blending process, the blending control unit 490 operates the bypass valve (not shown) installed at the front of the storage tank to perform the blending process for the backwash drain water, sludge, It enters the storage tank while it is not performed and stores it.

Also, as shown in FIG. 3, when only the washing waste solution and the concentrated water are blended, the backwash water and the sludge are stored in the storage tank 410.

Particularly, unlike the sludge continuously flowing out from the pre-treatment section 110 and the A / S section 120, the backwash drainage water is supplied to the pretreatment section 130 through the pre- The water quality of the mixed water is likely to exceed the predetermined water quality because the water is intermittently discharged only during the cleaning process using the chemicals of the A / S part 120, the pretreatment part 130 and the RO 200 part. In this case, the water quality of the mixed water is maintained to be relatively constant, which is effective.

In the seawater desalination apparatus according to the present invention Blending  Explanation of method

Hereinafter, the blending method in the seawater desalination apparatus according to the present invention will be described with reference to FIG.

However, the process of producing the production water through the pre-treatment section 110, the A / S section 120, the preprocessing section 130, the C / F section 140 and the RO section 200 is the prior art, The blending processing unit 400 and the waste liquid storage tank 500 will be mainly described.

First, in the blending control unit 490, the water quality of mixed water as a reference for determining whether or not to discharge water is set in advance.

As an example, the water quality of the mixed water to be set may be at least one of any items of the water pollutant emission standard (ocean discharge standard) shown in FIG. 4, but is not limited thereto.

However, as described above, it is preferable that a value of 80 to 95% of the water quality which is a criterion for determining whether or not to discharge the water is set.

The blending sensor S _B senses the quality of the mixed water in real time and sends it to the blending control unit 490.

Next, the blending control unit 490 compares the water quality of the sensed mixed water with the predetermined water quality of the mixed water, which is a reference, and determines whether to perform the blending process.

Alternatively, the amount of discharged sludge and backwashing effluent may be set, and it may be determined whether or not the blending process is performed depending on whether the amount of set sludge and backwashing effluent exceeds a predetermined amount. In this case, it is determined that the blending process is performed when the amount of sludge to be discharged and the amount of backwash drainage water exceed a predetermined amount, and in the opposite case, the blending process is not performed.

2, the blending control unit 490 stops the blending pump P _B (or when the blending valve V _B is installed) as shown in FIG. 2, , The blending valve (V _B ) is closed), and the washing waste liquid is blended with the concentrated water to discharge the blended mixed water.

In this case, the blending control unit 490 opens the bypass valve installed in front of the storage tank 410 in the direction of the storage tank so that the backwash drain water and the sludge can flow into the storage tank 410 to be stored.

On the other hand, if it is determined that the blending process is not to be performed, the blending control unit 490 closes the waste liquid pump P _{W and} discharges only concentrated water.

3, when the blending control unit 490 determines to perform the blending process, the blending control unit 490 operates the blending pump P _B (or the blending valve V _B ) When installed, the blending valve (V _B ) is opened) to discharge the backwash effluent, sludge and washing waste liquid with the concentrated water to discharge the blended mixed water.

On the other hand, when it is determined that do not perform the blending process, a blending control unit 490 is a blending pump (P _B) stops the operation of (for the installation to the blending valve (V _B), closing the blending valve (V _B)) Thereby discharging only concentrated water.

The operation of the blending pump P _B according to whether or not the blending process is performed is performed by controlling the rotation speed of the pump with the inverter included in the blending pump P _B and when the blending valve V _B is installed, V _B ) of the waste liquid pump (P _W ) and the waste liquid valve are controlled by the inverter as described above.

In this case, the blending control unit 490 opens the bypass valve installed in front of the storage tank 410 in the direction of the storage tank so that the backwash drain water, sludge, and washing waste solution can flow into the storage tank 410 to be stored. Even if the sludge, the backwash drain water and the washing waste liquid are instantaneously discharged in excess of a predetermined amount, the sludge and the backwashing drain water are introduced into the storage tank 410 while the washing waste liquid flows into the waste liquid storage tank 500 .

Further, the operation of the waste liquid pump (P _W ) is controlled according to the quality of the mixed water to control the mixing amount of the washing waste liquid flowing out from the waste liquid storage tank 500 or the amount of the washing waste liquid flowing into the storage tank 410.

As described above, according to the seawater desalination apparatus and the mixing water blending method of the present invention, since the washing waste liquid flowing out from the backwashing effluent discharged from the pretreatment unit, the sludge and the RO unit can be discharged to the concentrated water, It is possible to omit the installation of the concentrating tank, the backwash discharge water tank, the filtration unit, the dewatering unit and the neutralization unit used for treating the concentrated water, the sludge, the backwashing effluent and the washing waste liquid in the seawater desalination apparatus, As well as reducing the installation cost and reducing the area of the installation site, the operation cost of the equipment and the chemicals added can be drastically reduced, thereby achieving a low cost and high efficiency seawater desalination process.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

110:
120: A / S part
130:
140: C / F part
200: RO portion
300: sludge treatment section
310: Backwash discharge water tank
320: Enrichment tank
330:
340: Dewatering unit
400: Blending processor
410: Storage tank
490: Blending control section
500: Waste liquid storage tank
P ₁₁₀ : Suction pump
P ₁₄₀ : Booster pump
P ₂₀₀ : High pressure pump
P _W : Waste liquid pump
P _B : Blending pump
V _B : Blending valve
S _B : Blending sensor

Claims (18)

delete A pretreatment unit 130 for filtering the collected seawater; And
A seawater desalination apparatus including a high-pressure membrane filtration unit into which seawater filtered by a pretreatment unit (130) flows,
The seawater desalination apparatus includes a waste solution storage tank 500 into which a washing waste solution flowing out from the pretreatment unit 130 and the high-pressure membrane filtration unit flows; And
A blending processor 400 for introducing and blending the concentrated water discharged from the high-pressure membrane filtration unit and the washing waste discharged from the waste solution storage tank 500;
A pretreatment unit 110 for causing the pretreatment unit 130 to coagulate / float or flocculate / precipitate the collected seawater;
And an A / S unit (120) for screening seawater discharged from the electrostatic processing unit (110)
The washing waste discharged from the electrostatic processing unit 110 and the A / S unit 120 flows into the waste solution storage tank 500,
Wherein the blending processing unit (400) discharges mixed wastewater discharged from the waste solution storage tank (500) and blended concentrated water, to the outside.
Seawater desalination equipment.
3. The method of claim 2,
The blending processing unit 400,
The sludge discharged from the pre-treatment unit 110 and the A / S unit 120, the backwash water discharged from the pretreatment unit 130, the concentrated water, and the mixed waste water blended with the washing waste liquid are discharged to the outside ≪ / RTI >
Seawater desalination equipment.
The method according to claim 2 or 3,
Wherein the high-pressure membrane filtration unit is an RO unit (200)
Seawater desalination equipment.
5. The method of claim 4,
The blending processing unit 400,
And a blending controller (490) for determining whether the blend is performed according to a predetermined quality of the mixed water.
Seawater desalination equipment.
6. The method of claim 5,
The blending processing unit 400,
And a blending sensor (S _B ) connected to the blending control unit (490) for sensing the quality of the mixed water,
Wherein the blending controller (490) compares the quality of the sensed water with the predetermined quality of the mixed water.
Seawater desalination equipment.
The method according to claim 6,
The predetermined water quality is determined based on
Characterized in that it is at least one of organic matter, inorganic matter, turbidity, electric conductivity, water temperature and pH.
Seawater desalination equipment.
8. The method of claim 7,
Wherein the pH value is in the range of 5.5 to 8.6.
Seawater desalination equipment.
9. The method of claim 8,
A C / F unit 140 for filtering the seawater flowing out of the preprocessing unit 130;
≪ / RTI >
Seawater desalination equipment.
10. The method of claim 9,
The blending processing unit 400,
Further comprising a storage tank (410) into which the backwash drain water, the sludge, and the washing waste liquid are introduced,
Seawater desalination equipment.
(a) setting a quality of the mixed water to be discharged by the blending control unit 490;
(b) discharging the mixed water blended with the concentrated water flowing out of the high-pressure membrane filtration unit through which the seawater is filtered and the washing waste discharged from the waste solution storage tank 500;
(c) sensing the quality of the mixed water discharged by the blending sensor (S _B );
(d) comparing the water quality of the sensed mixed water with the water quality of the mixed water set in the blending control unit 490 to determine whether or not the blending process is performed;
(e) When it is determined that performing the blending process the blend control 490 (P _W), the waste pump so that the concentration be blended flowing out of the washing waste solution and the high-pressure membrane filtration unit that exits from the waste solution storage tank 500 , And stopping the blending pump (P _B ) or closing the blending valve (V _B ).
Method for blending cleaning waste liquid.
12. The method of claim 11,
The step (e)
The blending control unit (490) stops the waste liquid pump (P _W ) when it is determined that the blending process is not performed.
Method for blending cleaning waste liquid.
13. The method of claim 12,
The step (e)
When the blending control unit 490 determines that the blending process is to be performed, the blending control unit 490 opens the bypass valve installed in front of the storage tank 410 in the direction of the storage tank 410 to introduce the backwash water and sludge into the storage tank 410 ≪ / RTI > further comprising:
Method for blending cleaning waste liquid.
(a) setting a quality of the mixed water to be discharged by the blending control unit 490;
(b) concentrated water flowing out from the high-pressure membrane filtration unit where seawater is filtered, sludge discharged from the pre-treatment unit 110 and the A / S unit 120, backwashing effluent discharged from the pretreatment unit 130, Discharging the blended mixed wastewater discharged from the washing water tank 500;
(c) sensing a quality of the mixed water by a blending sensor (S _B );
(d) comparing the water quality of the sensed mixed water with the water quality of the mixed water set in the blending control unit 490 to determine whether or not the blending process is performed;
(e) When it is determined that performing the blending process the blend control 490 (P _W), the waste pump so that the concentration be blended flowing out of the backwash drain water and the high-pressure membrane filtration unit that exits from the pre-processing unit 130 And operating the blending pump (P _B ), or opening the blending valve (V _B ).
Method for blending cleaning waste liquid.
15. The method of claim 14,
The step (e)
If it is determined that the blending process is not performed, the blending control unit 490 controls the blending operation of the sludge discharged from the pre-treatment unit 110 and the A / S unit 120 and the backwash water discharged from the pre- The waste liquid pump P _W and the blending pump P _B are stopped or the blending valve V _B is closed so that the concentrated washing water discharged from the waste liquid storage tank 500 and the concentrated water flowing out from the high- Further comprising the step of:
Method for blending cleaning waste liquid.
16. The method of claim 15,
The step (e)
The blending control unit 490 opens the bypass valve installed in front of the storage tank 410 in the direction of the storage tank 410 so that the backwash drain water, sludge, Further comprising the steps of:
Method for blending cleaning waste liquid.
15. The method according to claim 11 or 14,
The step (d)
And comparing the discharge amounts of the discharged sludge and the backwashing drain water with predetermined sludge and backwashing drainage water to determine whether or not the blending process is performed.
Method for blending cleaning waste liquid.
15. The method according to claim 11 or 14,
In the step (e)
The blending pump (P _B) and the operation of the waste pump (P _W) is a rotational speed of the inverter, opening and closing of the blending valve (V _B) is blended with the concentrated water as the opening ratio of the blending valve (V _B) The amount of the sludge, the backwash drainage water and the washing waste liquid is controlled.
Method for blending cleaning waste liquid.

Images