KR101400992B1 - Desalination apparatus using a tidal range and desalination method using the same - Google Patents

Abstract

The present invention relates to an intelligent and active seawater desalination apparatus which makes an effective use of a tidal range, a change in salt concentration of seawater intake; and a seawater desalination method using same. According to the seawater desalination apparatus and method of the present invention, initial installation costs (construction costs) and operating expenses (repair and maintenance costs) can be reduced and the acquisition of treated water reaching a target water quality can be ensured all the time.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seawater desalination apparatus using seawater desalination and a desalination apparatus using the same,

The present invention relates to a seawater desalination apparatus using a difference in fresh water tide and a method for desalination of seawater using the same, wherein the construction cost (initial installation cost) and operation cost (maintenance cost) are reduced, The present invention relates to a seawater desalination apparatus and method.

One of the problems faced by mankind in the 21st century is water. As industrialization progresses and population grows, demand for water surges, while water resources are limited.

Also, due to global desertification and lack of precipitation due to climate change, water depletion is getting worse in some areas.

In order to solve this problem, a lot of techniques for desalination of seawater have recently been studied. The seawater desalination is a method of removing a salt-containing dissolved substance from seawater which is difficult to use directly with domestic water, agricultural water or industrial water, , Agricultural water or industrial water, and so on.

Currently, the evaporation method, which accounts for most of the seawater desalination technology, requires enormous energy such as steam as a large-scale facility, and research and development are currently under way to utilize reverse osmosis (RO).

A related prior art will be described.

Korean Patent No. 1051345 discloses a method using 2-pass RO in order to increase the efficiency in seawater treatment and increase the purity of treated water. In this case, water treatment close to ultrapure water can be performed, There is a problem that an initial initial installation cost and an operating cost are required.

Japanese Laid-Open Patent Application No. 2013-052349 discloses a technique to overcome this problem. By installing a bypass by adding 2 pass RO, it is determined whether or not the secondary treatment is performed according to the salt concentration of the primary treatment water A seawater desalination process is started.

1 and 2, a seawater desalination apparatus for installing a bypass will be described in detail.

1, seawater flows into the water intake processing unit 100, which then flows into the pretreatment unit 200 to remove particulate suspended solids and some organic substances first, and then, at a high pressure, And is introduced into the 1-pass RO filtration unit 300 by the pump 310 to be subjected to the main treatment.

The treated water produced by the main treatment in the 1 pass RO filtration unit 300 generally does not reach the TS (total solid) or TDS (total dissolved solid) required by the drinking water, In the case of industrial water requiring water quality, the final target water quality can not be satisfied.

For example, sea water reverse osmosis (SWRO), which has a typical TDS of 25,000 to 45,000 mg / L for seawater and has excellent performance and has a salt removal efficiency of about 98 to 99% in a seawater desalination plant, When used, the 1st pass treated water has a TDS of 250 to 900 mg / L, and the standard of chlorine ion (250 mg / L), TS (500 mg / L) and TDS .

Accordingly, the 2-pass RO filtration unit 400 is additionally provided, so that the treated water (TDS: 250 to 900 mg / L) subjected to the 1 pass primary treatment by the high-pressure pump 410 is introduced and processed, And is collected in the water tank 500. Generally, there is no need to utilize SWRO in the secondary treatment, so BWRO (brackish water reverse osmosis), which has an efficiency of about 90%, is utilized for cost reduction.

When SWRO and BWRO are connected in two passes, the TDS of the final treated water will be in the range of 25 to 90 mg / L, which is about the level of the ultra-pure water, .

Therefore, by partially bypassing the 1-pass primary treated water and blending with the 2-pass secondary treated water to increase the membrane life of the 2-pass RO filtering unit 400 and to save the operating cost, Apply a Partial 2 pass process to increase the concentration.

In this case, although the operating cost is reduced to some extent and the capacity of BWRO is reduced, the problem of over-installation cost is not solved by installing two high-cost SWRO units and BWRO units, There arises another problem that effective control is not performed because proper study of pass timing (time) to bypass flow is not performed.

The prior art shown in FIG. 2 further includes a 2 ^nd stage RO filtration unit 350 for further RO treatment of the concentrated brine produced in the 1 pass RO filtration unit 300 at another stage (2 ^nd stage) And has the same problem as the prior art shown in Fig.

(Patent Document 1) Korean Patent Registration No. 1051345 B1

(Patent Document 2) JP-A-2013-052349 A

Accordingly, it is an object of the present invention to solve the problem of the salt concentration problem (removal rate) of the final treated water of the prior art 1 pass RO process, the excessive initial installation cost of the 2 pass RO process, , Blending timing and blending flow rate.

As shown in FIG. 3, in order to solve the above problems, the present invention provides a one-pass RO filtration unit 300 in which seawater is introduced and processed. And a control unit (600) for controlling the flow rate of the blended raw water flowing into the 1-pass RO filtering unit (300).

The control unit 600 controls the flow rate of the water tank 110 to simultaneously control the blended raw water flowing into the 1-pass RO filtering unit 300, And controls the flow rate of the fresh water flowing into the fresh water tank (110) in association with the seawater of the water intake processing unit (100) having the salinity varying in accordance with the flow rate of the seawater. The fresh water in the first RO filter 110 is blended and processed in the 1-pass RO filtering unit 300, and then collected (stored) in the treatment water tank 500.

Instead of or in addition to the flow rate of the incoming fresh water, it is possible to further control the flow of fresh water.

The sensor 610 detects an average sea level (MSL) at the intake of the seawater to be introduced into the 1-pass RO filtering unit 300 and measures and senses the concentration of seawater salinity. And the difference between the tides is preferably confirmed using the sensed average sea level.

Alternatively, the sensor 610 senses the seawater salinity concentration, and the difference only in the tide distance changes with a predictable linear relationship corresponding to the sensed seawater salinity concentration.

The system further includes a database (620) for storing level information and sea water salinity concentration information for a difference between tides of a seawater intake point to be introduced into the 1-pass RO filtering unit (300) It is preferable that information on the tidal difference and the salinity of the sea water can be confirmed from the information stored in the database 620.

It is preferable that the database 620 stores at least one of information on the average sea level of the seawater intake point, information on the seawater salinity concentration, and information on the correlation between the average sea level and the sea salt concentration Do.

Also, coagulation & sedimentation, pretreatment of dissolved air flotation, disinfection, sand filtration, and multiple media (hereinafter referred to as " It is preferable to further include a pretreatment unit 200 such as multimedia filtration, microfiltration (MF), ultrafiltration (UF), nanofiltration (NF), and the like.

In addition, it is preferable that the water treatment unit 100 further comprises a strainer, a pump, or the like for taking in the seawater to be introduced into the pretreatment unit 200.

3, the seawater desalination apparatus further includes a fresh water tank 110 into which the fresh water flows, and fresh water introduced into the fresh water tank 110 flows into the pretreatment unit 200 together with seawater , The treated seawater and fresh water may be blended.

4), a fresh water treatment unit 120 for treating fresh water to be introduced into the 1-pass RO filtering unit 300, wherein fresh water treated in the fresh water treatment unit 120 is supplied to the 1-pass RO filtering unit 300, pass RO filtration unit 300, the treated seawater and the fresh water can be blended.

In order to achieve the above-mentioned object, the present invention provides a method for controlling the performance of a 1-pass RO filter unit (300) Determining a flow rate of the fresh water to be introduced using the information of the flow rate; (b) determining whether the control unit 600 confirms the concentration of seawater salinity and whether or not it is blended; (c) blending the fresh water of the flow rate determined in step (a) with seawater when it is determined that blending is required; And (d) filtering the blended seawater and fresh water through the 1-pass RO filtration unit 300.

Instead of or in addition to the flow rate of the incoming fresh water, it is possible to further control the flow of fresh water.

In one embodiment, the step (b) includes the steps of: (b1) sensing the average sea level level information and the seawater salinity concentration information of the seepage point of the seawater; And (b2) the controller (600) calculates the sea salt concentration using a correlation between the sensed average sea level information and a predetermined average stored sea level level information and a sea salt concentration, It is preferable to include a step of confirming.

In another embodiment, the step (b) may include the step (b3) of checking the seawater salinity concentration of the seawater taken in real time by the sensor (610).

In another embodiment, the step (b) includes the steps of: (b4) determining whether the control unit 600 determines a correlation between the average sea level of the seawater receiving location preliminarily stored in the database 620 and the average sea level and the sea salt concentration And a step of confirming the seawater salinity concentration by using the method.

In yet another embodiment, the step (b) comprises: (b5) checking the seawater salinity concentration using the seawater salinity concentration of the seawater intake point pre-stored in the database 620 by the controller (600) .

If the determined seawater salinity concentration exceeds the critical water quality after the controller 600 has previously determined the critical water quality of the seawater salinity concentration for achieving the final target water quality to be produced, the step (b) May be determined to be necessary.

Alternatively, it is assumed that the control unit 600 processes the seawater in the 1-pass RO filtering unit 300. In this case, the salinity concentration of the treated water to be finally produced is calculated, And determining that blending is required if the target water quality to be finally produced is exceeded.

Further comprising the step of (c1) collecting fresh water in the fresh water tank (110) and transferring the seawater to the water intake processing unit (100) and collecting the water in the first embodiment (Fig. 3) May be a step where fresh water is blended with seawater and preprocessed in the pre-treatment unit 200 when blending is determined to be necessary.

In the second embodiment (FIG. 4), after the step (c1), (c2) the fresh water collected in the fresh water tank 110 is treated in the fresh water treatment unit 120, And a step of performing a preprocessing in the step (200).

According to the present invention, solving the problem of the salt concentration of the 1 pass RO process and solving the problem of the RO membrane, the RO vessel, the pump, the valve, and the piping , Skid, and meter are used only once to overcome the problem of excessive construction cost and operating cost of the 2 pass RO process.

In addition, blending is performed only at an appropriate timing by using the correlation between the tidal difference and the sea salt concentration, thereby reducing the construction cost as well as the operating cost.

In addition, since the difference in the tidal range of the seawater intake point is used, the seawater desalination can be optimized by varying the operation method according to the different salinity concentration at each place where the seawater is taken.

Figures 1 and 2 schematically illustrate a seawater desalination apparatus according to the prior art.
FIGS. 3 and 4 schematically show first and second embodiments of the seawater desalination apparatus using the difference between the tide lengths according to the present invention.
In FIGS. 1 to 4 (FIGS. 1 to 4), a plurality of valves should be provided between the respective components as necessary, but the illustration of the valves is omitted for the sake of explanation.
5 is a graph for explaining the change in salinity concentration with the difference in the tidal range between the average sea level at the water intake point and the electrical conductivity.
FIG. 6 is a graph for explaining the method of desalination of seawater according to the present invention using TDS for one change.

In the present specification, "difference in tide interval" means a difference in mean sea level between the low tides and the midsund tides in the seawater where the average sea level periodically ascends and descends by the attraction of the moon or the sun do. In other words, in the following description, the "tidal difference only" is the same as "difference in average sea level", and if information on average sea level is used, information on difference between tides can be confirmed.

In the present specification, "salt" (of seawater or fresh water) refers to a sum of dissolved inorganic ions contained in water, and is a sum of sodium ion, chloride ion, boron ion, bromide ion, sulfate ion, It refers to the ionic substance in seawater and expresses the concentration by TDS, TS, Salinity, Conductivity, and so on.

The term "treatment" (of seawater or fresh water) in the present specification means all the processes for filtering impurities and the like in the for-treatment water to increase the purity. Examples thereof include microfiltration (MF), ultrafiltration (UF), nanofiltration , Reverse osmosis (RO), and so on.

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

In the present specification, "RO" means reverse osmosis. The RO process is a type of filtration, which is a conventional technique well known in the art, and thus a detailed description thereof will be omitted.

In the present specification, "2 pass RO" means a process for processing a target RO processed in 1 pass RO and means a second RO in the RO installed in two stages in order to achieve two RO processes as described in the related art do. "1 pass RO" is a term set to correspond to "2 pass RO ", which means a single RO for performing a general RO process.

In the present specification (FIG. 2), 1 pass RO is a term set to "1 ^st Stage RO" and "2 ^nd Stage RO" is a term set to increase recovery by treating unfiltered and rejected concentrated water of 1 pass RO .

Hereinafter, a seawater desalination apparatus and desalination method according to the present invention will be described in detail with reference to the drawings.

1st In the embodiment  The seawater desalination device (FIG. 3)

Fig. 3 shows a first embodiment of a seawater desalination apparatus according to the present invention.

The seawater desalination apparatus according to the present invention includes a water intake processing unit 100, a pre-processing unit 200, a 1 pass RO filtering unit 300, a process water tank 500, and a control unit 600.

And a high-pressure pump 310 for injecting water into the 1-pass RO filtering unit 300.

In the drawing, the 1-pass RO filtering unit 300 is shown as SWRO, but it is not limited thereto.

Here, the water intake processing unit 100, the preprocessing unit 200, and the treatment water tank 500 are the prior art as described in the background art, and a detailed description thereof will be omitted.

The seawater desalination apparatus according to the present invention further includes a fresh water tank 110 into which fresh water flows. After the fresh water is collected, the fresh water is flowed into the pretreatment unit 200 at a predetermined flow rate for a predetermined time according to the control of the control unit 600 so that the sea water and the fresh water are blended.

It is one of the key concepts of the present invention that the control unit 600 controls the time and / or the flow rate of blending sea water and fresh water, and will be described in detail below.

FIG. 5 shows the change in mean sea level (MLS, cm) and the concentration (conductivity, 占 퐏 / cm) (y axis) in daytime change in a specific area, i.e., time (x axis). It is a well-known fact that such a cycle occurs even though the numerical value may be slightly different depending on the region. Also, the difference in the average sea level shown is the difference between the tides only described in this specification.

Fig. 5 shows that the difference only in the tide interval corresponds to the difference in the high salt concentration of seawater. That is, immediately after the average sea level becomes high, the salinity of the seawater becomes high, and conversely, the salinity of the seawater becomes low immediately after the average sea level becomes low. In other words, the seawater salinity concentration is repeatedly rising and falling periodically, and the degree of repetition corresponds to the difference in the tide interval.

The key concept of the present invention is to control the time and / or flow rate of the fresh water to which the control unit 600 is blended so as to correspond to the difference in the tide interval, that is, the change in the salt concentration. In other words, when the difference in the tidal range is used, the corresponding sea water salinity concentration can be known. Therefore, when the sea water salinity concentration is low, the target water quality (ie, salinity concentration) And when the sea salt concentration is high, the 1-pass RO treatment can not reach the target water quality to be finally produced, so the fresh water of a predetermined flow rate is introduced for a predetermined time and blended. In the prior art, since it is necessary to obtain the treated water which is guaranteed to be always produced at the target water quality to be finally produced for 24 hours on the basis of the highest salinity concentration of the sea water without changing the driving method of the desalination device with time, It is not necessary to perform the 2-pass RO treatment by adjusting the degree of blending with time using the difference of the fresh water tide, that is, the salinity concentration, as in the present invention, so that it is superior in the construction cost (initial installation cost) .

A method for controlling the time and / or flow rate of the incoming fresh water will be described in detail with reference to FIG.

In one embodiment, as shown in the top view (conceptual diagram) of FIG. 6, the degree of blending necessary can be confirmed by using TDS (total dissolved solid) of the incoming seawater raw water, that is, seawater salinity concentration.

First, the control unit 600 sets a critical water quality (seawater salinity concentration) requiring blending in consideration of a target water quality to be finally produced (i.e., salinity concentration). This may differ depending on filtration performance of the 1-pass RO filtration unit 300 or the like.

Next, it is possible to check the concentration of seawater salinity in real time through the data acquired from the plurality of sensors 610 provided in the water taking-in place, which is provided in cooperation with the control unit 600. The sensor 610 may sense the seawater salinity concentration directly or may sense the average sea level by using a correlation between the average sea level and the seawater salinity concentration which are previously determined as shown in FIG.

Instead of using the sensor 610, a pre-measured and stored database 620 may be utilized. Similarly, in the database 620, either the average sea level or the sea salt concentration of the seawater intake point is previously stored, and either one of them can be used.

Next, when the seawater salinity concentration determined in the sensor 610 and / or the database 620 exceeds the threshold water quality set in consideration of the target water quality to be finally produced (i.e., salinity concentration), blending is performed.

As shown, it will generally be necessary to have a blending time (A) twice a day, i.e. a fresh water inflow time, due to the nature of the low tide and high tide, and the minimum amount of fresh water to be blended is, Sea salt concentration, and the like. Also, depending on seasonal and climatic conditions such as rainfall, rainy season, drought, and heavy snowfall, the same area may be determined differently.

In another embodiment, as shown in the bottom view (conceptual diagram) of FIG. 6, the degree of blending required can be confirmed by using the TDS of the treated water processed by the 1 pass RO filtering unit 300.

In the desalination process, the target water quality to be always produced, which the final treated water has, is predetermined.

Therefore, assuming that the seawater salinity concentration measured in real time is processed in the 1 pass RO filtering unit 300 without blending, as in the previous embodiment, the time when the salinity concentration exceeds the target water quality to be finally produced is calculated The blending time (B), i.e., the fresh water inflow time can be confirmed, and the minimum amount of fresh water to be blended can be confirmed and accurately estimated as indicated by yellow in FIG.

Referring back to FIG. 3, the controller 600 controls the flow of the fresh water and the time for blending the fresh water and the fresh water.

To this end, the control unit 600 is associated with the sensor 610 and / or the database 620.

It is preferable that the sensor 610 is provided at a water intake place of the seawater. The sensor 610 may sense the average sea level or may directly sense the salt concentration.

The database 620 stores at least one of information on the average sea level of the seawater intake point, information on the seawater salinity concentration, and information on the correlation between the average sea level and the seawater salinity concentration.

The control unit 600 controls the fresh water inflow means such as the valves provided between the water tank 110 or the water tank 110 and the pre-processing unit 200.

The final produced water through the above process is collected in the treatment water tank 500.

Second In the embodiment  The seawater desalination device (FIG. 4)

Fig. 4 shows a second embodiment of the seawater desalination apparatus according to the present invention.

Unlike the first embodiment (Fig. 3), a fresh water treatment unit 120 is further provided.

That is, in the first embodiment, there is no separate fresh water treatment section, and the fresh water collected in the fresh water tank 110 flows to the pretreatment section 200 and then blended and pretreated with the sea water. In the second embodiment, The fresh water is separately treated in the fresh water treatment unit 200 and the fresh water is treated in a separate fresh water treatment unit 120.

In the case of the first embodiment, it is advantageous in that the construction cost and the operation cost are low because the pretreatment is carried out in the pretreatment unit 200 after the salt concentration is lowered first by blending first. On the other hand, in the case of the second embodiment, It is possible to precisely set the optimized pretreatment unit 200 and the fresh water treatment unit 120.

Explanation of method of seawater desalination

The target water quality of the final treated water to be finally produced is predetermined.

The controller 600 determines two things.

First, it is a criterion for determining whether or not to blend in order to achieve the predetermined target water quality to be finally produced. The second is the time at which fresh water should flow and / or the flow rate of incoming fresh water if blending is decided.

In order to determine this, the performance of the 1-pass RO filtration unit 300 and the difference in the tidal range, that is, the change in the salinity concentration, should be used.

The first method is to determine the blending required critical water quality to achieve the target water quality to be finally produced as shown in the upper part of FIG. 6 and compare it with the seawater salinity concentration to be confirmed. Assuming that 1 pass RO treatment is performed, it is compared whether or not the target water quality to be finally produced is reached. The concrete contents are omitted as described above.

Either way, it is necessary to confirm the current sea level of salinity. The method of confirming the seawater salinity concentration includes a method using the sensor 610 and a method using the database 620. [

Even when the sensor 610 is utilized, two methods are possible.

The sensor 610 measures the average sea level of the seawater intake in real time and the controller 600 uses the correlation between the previously determined average sea level and the seawater salinity concentration (stored in the database 620) The concentration can be confirmed in real time. Alternatively, the sensor 610 may directly sense the seawater salinity concentration.

Two methods are possible when utilizing the data stored in the database 620 either without the sensor 610 or with the sensor 610.

The average sea level depending on the difference of the tide interval is stored in the database 620 at the water intake point and the control unit 600 can confirm the sea salt concentration by using the correlation between the average sea level and the sea salt concentration previously confirmed . Alternatively, the seawater salinity concentration may be stored directly in the database 620.

If a difference in the concentration of seawater salinity is observed over time, the control unit 600 determines whether blending is needed according to a predetermined criterion, the time at which freshwater should be introduced when blending is required, and / Is determined. It is common to blend twice a day due to the difference in the tide interval (the range of high point of salt concentration).

Look at the flow of concrete freshwater and seawater.

The fresh water collects in the fresh water tank 110, and the seawater flows into the pretreatment unit 200 through the water intake processing unit 100.

In the first embodiment (FIG. 3), when the controller 600 determines that blending is necessary, the determined flow rate among the fresh water collected in the water tank 110 flows into the pretreatment unit 200 for a predetermined time and is blended.

The pretreatment unit 200 preprocesses the blended to-be-treated water, which flows to the 1-pass RO filtration unit 300 through the high-pressure pump 310 and is filtered, and the finally produced treated water collects in the treated water tank 300.

In the second embodiment (Fig. 4), the fresh water collected in the water tank 110 is treated in the fresh water treatment unit 120, and the pre-treatment unit 200 performs only the pretreatment of seawater. When the control unit 600 determines that blending is required, the treated fresh water and the pretreated seawater are blended into the 1-pass RO filtration unit 300 by the high-pressure pump 310 and then introduced.

The 1-pass RO filtering unit 300 filters the filtered water, and finally collects the treated water in the treated water tank 500.

100:
110: Water tank
120: fresh water treatment section
200:
300: 1 pass RO filtration section
310: High pressure pump
400: 2 pass RO filtration section
410: high pressure pump
500: Treatment tank
600:
610: Sensor
620:

Claims (23)

A 1 pass RO filtration unit 300 through which seawater is introduced and processed; And
And a control unit (600) for controlling the flow rate of the fresh water flowing into the 1-pass RO filtering unit (300)
The control unit 600 controls the flow rate of the incoming fresh water in accordance with the difference between the fresh water levels of the fresh water receiving places of the seawater flowing into the 1-pass RO filtering unit 300,
The seawater and the inflowed fresh water are blended and processed in the 1-pass RO filtration unit 300, and then collected in the treatment water tank 500. [
Seawater desalination equipment.
The method according to claim 1,
The control unit (600) further controls a time during which the fresh water flows in accordance with a difference between tides of the seawater intake point of the seawater flowing into the 1-pass RO filtering unit (300)
Seawater desalination equipment.
A 1 pass RO filtration unit 300 through which seawater flows and is filtered; And
And a control unit (600) for controlling the time during which fresh water flows into the 1-pass RO filtering unit (300)
The control unit 600 controls the time during which the fresh water flows into the first pass RO filtering unit 300 corresponding to the difference between the fresh water tides of the seawater flowing into the first pass RO filtering unit 300,
The seawater and the inflowed fresh water are blended and processed in the 1-pass RO filtration unit 300, and then collected in the treatment water tank 500. [
Seawater desalination equipment.
4. The method according to any one of claims 1 to 3,
Further comprising a sensor (610) provided at a water intake point for entering the 1-pass RO filtering unit (300) and sensing an average sea level,
Wherein the difference between the tides is identified using the sensed average sea level.
Seawater desalination equipment.
4. The method according to any one of claims 1 to 3,
Further comprising a sensor (610) provided at a water intake point for entering the 1-pass RO filtering unit (300) and sensing the concentration of seawater salinity,
Wherein the difference in the tidal range only corresponds to the sensed seawater salinity concentration.
Seawater desalination equipment.
4. The method according to any one of claims 1 to 3,
Further comprising a database (620) for storing information on a difference in the number of tides of the seawater intake point for entering the 1-pass RO filtering unit (300)
Characterized in that the difference between the tides is visible from the information stored in the database (620)
Seawater desalination equipment.
The method according to claim 6,
The database (620)
Information on the average sea level of the seawater intake point, information on the seawater salinity concentration, and information on the correlation between the average sea level and the seawater salinity concentration.
Seawater desalination equipment.
4. The method according to any one of claims 1 to 3,
Further comprising a pretreatment unit (200) for pretreating seawater to be introduced into the 1-pass RO filtering unit (300)
Seawater desalination equipment.
9. The method of claim 8,
Further comprising a water intake processor (100) for taking in the seawater to be introduced into the pre-processor (200)
Seawater desalination equipment.
9. The method of claim 8,
The seawater desalination apparatus further includes a fresh water tank (110) into which fresh water flows,
The fresh water flowing into the water tank 110 flows into the pretreatment unit 200 together with the seawater so that the seawater and the fresh water are blended and pretreated in the pretreatment unit 200.
Seawater desalination equipment.
9. The method of claim 8,
Further comprising a fresh water treatment unit (120) for treating the fresh water to be introduced into the 1-pass RO filtering unit (300)
And the fresh water treated in the fresh water treatment unit 120 flows into the 1-pass RO filtration unit 300 so that the pretreated seawater and the fresh water are blended.
Seawater desalination equipment.
(a) determining a flow rate of the fresh water to be introduced using the difference between the performance of the 1-pass RO filtration unit 300 and the tide interval so that the control unit 600 achieves a predetermined final target water quality to be produced;
(b) determining whether the control unit 600 confirms the concentration of seawater salinity and whether or not it is blended;
(c) blending the fresh water of the flow rate determined in step (a) with seawater when it is determined that blending is required; And
(d) Blended seawater and fresh water are filtered in the 1-pass RO filtration unit 300
≪ / RTI >
Seawater desalination method.
13. The method of claim 12,
The control unit 600 further determines the time for the fresh water to flow in the step (a), and in the step (c), the fresh water and the sea water are blended for the determined time.
Seawater desalination method.
(a) determining the time at which the fresh water flows into the control unit 600 using the difference between the performance of the 1-pass RO filtering unit 300 and the freshwater level to achieve a predetermined final target water quality to be produced;
(b) determining whether the control unit 600 confirms the concentration of seawater salinity and whether or not it is blended;
(c) if blending is determined to be necessary, freshwater is blended with seawater for a time determined in step (a); And
(d) Blended seawater and fresh water are filtered in the 1-pass RO filtration unit 300
≪ / RTI >
Seawater desalination method.
15. The method according to any one of claims 12 to 14,
The step (b)
(b1) sensing the average sea level of the seawater receiving location of the sensor 610; And
(b2) The controller (600) checks the sea water salinity concentration using the correlation between the sensed average sea level, the predetermined average sea level and the sea water salinity concentration
≪ / RTI >
Seawater desalination method.
15. The method according to any one of claims 12 to 14,
The step (b)
(b3) confirming the seawater salinity concentration of the seawater receiving point in real time sensed by the sensor (610) by the controller (600)
≪ / RTI >
Seawater desalination method.
15. The method according to any one of claims 12 to 14,
The step (b)
(b4) checking the seawater salinity concentration by using the correlation between the average sea level of the seawater receiving place pre-stored in the database 620 and the average sea level and the sea salt salinity concentration,
≪ / RTI >
Seawater desalination method.
15. The method according to any one of claims 12 to 14,
The step (b)
(b5) checking the seawater salinity concentration using the seawater salinity concentration of the seawater intake point pre-stored in the database 620 by the control unit 600
≪ / RTI >
Seawater desalination method.
15. The method according to any one of claims 12 to 14,
The step (b)
The control unit 600 determines a critical water quality of the seawater salinity concentration for achieving the target water quality to be finally produced and then determines that blending is required when the determined seawater salinity concentration exceeds the critical water quality
≪ / RTI >
Seawater desalination method.
15. The method according to any one of claims 12 to 14,
It is assumed that the control unit 600 processes the seawater in the 1-pass RO filtering unit 300. In this case, the salinity concentration of the treated water is calculated, Determining that blending is required if the water quality is exceeded
≪ / RTI >
Seawater desalination method.
15. The method according to any one of claims 12 to 14,
Before the step (c)
(c1) Fresh water collects in the fresh water tank (110), and seawater collects in the water intake processing unit (100)
Lt; RTI ID = 0.0 > 1, < / RTI &
Seawater desalination method.
22. The method of claim 21,
Wherein the step (c) comprises the step of pre-treating the fresh water in the pretreatment unit (200) when it is determined that blending is necessary,
Seawater desalination method.
22. The method of claim 21,
After the step (c1)
(c2) Fresh water collected in the fresh water tank 110 is treated in the fresh water treatment unit 120, and seawater collected in the water intake treatment unit 100 is pretreated in the pre-treatment unit 200
Lt; RTI ID = 0.0 > 1, < / RTI &
Seawater desalination method.

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