KR20180034106A - Hybrid desalination ststem and method for water treatment using the same - Google Patents

Abstract

A hybrid seawater desalination system of the present invention comprises: an osmosis unit for concentrating water to be treated to discharge concentrated tap water and first diluted seawater separately by using pretreated seawater as an inductive solution; a first reverse osmosis unit for filtering the first diluted seawater to discharge first treated water and first concentrated water; a second reverse osmosis unit for filtering the pretreated seawater to discharge second treated water and second concentrated water; and a pressure delayed osmosis unit for discharging the second diluted seawater by using the second concentrated water as an inductive solution.

Description

TECHNICAL FIELD The present invention relates to a hybrid seawater desalination system and a water treatment method using the hybrid seawater desalination system,

The present invention relates to a hybrid seawater desalination system and a water treatment method using the same.

Water scarcity is getting worse globally. In order to solve this problem, a method of desalination of seawater as an infinite resource is receiving the most attention.

There are many energy consumption drawbacks in overcoming the high osmotic pressure of seawater and producing fresh water. Recently, a process using raw water having low osmotic pressure such as sewage or reused water has been used to reduce the energy used in the desalination process using reverse osmosis.

However, there is a problem that the desired flow rate can not be stably secured due to the influence of the season, environment, etc. in the sewage or reused water, and in this case, the efficiency of the process is lowered.

In addition, there is a problem that the public is reluctant to drink because of the recognition that the water is produced using sewage or reused water.

Therefore, it is necessary to provide a water treatment system which can save energy and operate stably even when the flow rate of sewage or reusing water is changed, and the public does not have a sense of resistance to drinking.

An object of the present invention is to provide a hybrid seawater desalination system capable of reducing energy and capable of stable operation irrespective of changes in the flow rate of the water to be treated and a water treatment method using the same.

Another object of the present invention is to provide a hybrid seawater desalination system which is free from discomfort by the public and a water treatment method using the same.

The above and other objects of the present invention can be achieved by the present invention described below.

One aspect of the invention relates to a hybrid seawater desalination system.

According to a specific example, the seawater desalination system comprises: an equilateral-triple-concentrating unit that uses pretreatment seawater as an inductive solution, concentrates the water to be treated and discharges the concentrate water and the first dilution seawater respectively, A first reverse osmosis part for discharging water and a first concentrated water, a second reverse osmosis part for discharging the second treated water and the second concentrated water by filtering the pretreated seawater, and a second reverse osmosis part using the second concentrated water as an induction solution, A second delayed seawater, and a pressure delayed osmotic section for producing energy.

The water to be treated may be sewage or reused water, and may have a lower osmotic pressure than the pretreatment seawater.

The first concentrated water may be introduced into the third tank together with the pretreatment seawater.

And the second dilution seawater may be introduced into the third compartment together with the pretreatment seawater.

In one embodiment, in the hybrid seawater desalination system, the untreated water is introduced and filtered through the pressure delay osmosis part to discharge the reused water, and the reused water may be recovered and filtered through the refuse sink and discharged to the concentrated source water.

In another embodiment, the hybrid seawater desalination system may be such that the concentrated source water is filtered in the pressure delay osmotic section and discharged to the condensed effluent.

In another embodiment, the concentrated raw water may be introduced into the pressure delay osmosis part together with the water to be treated and filtered.

Wherein the first concentrated water is discharged through a fourth pipeline, and the fourth pipeline includes a first water quality monitoring unit for evaluating the quality of the first concentrated water, wherein the first concentrated water is discharged through the fourth pipeline, 1 concentrated water may join the first pipe through the sixteenth pipe branched from the fourth pipe and may be introduced into the third pipe.

The hybrid seawater desalination system may further include a second water quality monitoring unit for discharging the second dilution seawater through the eighth pipeline and the eighth pipeline for evaluating the quality of the second dilution seawater, The second dilution seawater may join the first pipeline through the seventeenth pipeline branching from the eighth pipeline and enter the third pipeline.

In the hybrid seawater desalination system, part of the pretreatment seawater is introduced into the forward osmosis part through a first pipe, the first dilution seawater flows into the first reverse osmosis part through a second pipe, The produced first treated water is discharged through a third pipe and the remainder of the pretreated seawater flows into the second reverse osmosis part through a fifth pipe to produce a second treated water and a second concentrated water, The treated water is discharged through the sixth pipe, and the second concentrated water can be introduced into the pressure delayed osmosis part through the seventh pipe.

According to one embodiment, in the hybrid seawater desalination system, the for-treatment water flows into the pressure delay osmosis unit through the ninth pipe, and the reused water produced from the pressure delay osmosis unit passes through the tenth pipe And the concentrated raw water produced from the above-mentioned third sampler can be discharged through the eleventh pipe.

According to another embodiment of the present invention, in the hybrid seawater desalination system, the untreated water flows into the normal-sampled part through the twelfth pipe, the concentrated raw water produced from the normal-sampled part flows into the pressure delayed osmosis part through the thirteenth pipe, Condensate effluent produced from the pressure delay osmotic section can be discharged through line 14.

According to another embodiment, the for-treatment water can be joined to the concentrated raw water through the fifteenth pipe.

The pressure delay osmotic section may include a turbine.

The second pipe or the fifth pipe may be provided with a pump.

The fourth pipe and the sixteenth pipe may have a flow control valve.

The eighth pipe and the seventeenth pipe may include a flow rate control valve.

The second treated water may not contact the for-treatment water, the concentrated raw water, the concentrated effluent, the first diluted seawater, the first treated water, the first concentrated water, and the second diluted seawater.

The hybrid seawater desalination system may further include a flow control unit for controlling a part of the pretreatment seawater and the remaining amount of the pretreatment seawater.

Another aspect of the present invention relates to a water treatment method.

In an embodiment, the water treatment method includes discharging a portion of the pretreatment seawater as an inducing solution to the first dilution seawater, filtering the first dilution seawater to discharge the first treated water and the first concentrated water, Filtering the remainder of the pretreatment seawater to discharge the second treated water and the second concentrated water, and discharging the second concentrated water to the second diluted seawater using the second concentrated water as an induction solution to produce energy, It may be a water treatment method using a hybrid seawater desalination system.

In the water treatment method, the water to be treated may be filtered by a pressure delay osmosis part using the second concentrated water as an induction solution and an osmosis part using part of the pretreatment seawater as an induction solution.

INDUSTRIAL APPLICABILITY The present invention has the effect of providing a hybrid seawater desalination system and a water treatment method using the seawater desalination system, which can save energy, operate stably regardless of changes in the flow rate of the water to be treated,

1 schematically illustrates a hybrid seawater desalination system according to one embodiment of the present invention.
2 schematically illustrates a hybrid seawater desalination system in accordance with another embodiment of the present invention.
3 schematically illustrates a hybrid seawater desalination system in accordance with another embodiment of the present invention.

Hereinafter, the present invention will be described in more detail.

In the following description of the present invention, detailed description of known related arts will be omitted when it is determined that the gist of the present invention may be unnecessarily obscured by the present invention.

In the case where the word 'includes', 'having', 'done', etc. are used in this specification, other parts can be added unless '~ only' is used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.

Also, in interpreting the constituent elements, even if there is no separate description, it is interpreted as including the error range.

hybrid  Seawater desalination system

1, a hybrid seawater desalination system according to an embodiment of the present invention will be described. 1 schematically illustrates a hybrid seawater desalination system according to an embodiment of the present invention.

1, a hybrid seawater desalination system according to an embodiment of the present invention includes a reverse osmosis unit 10, a first reverse osmosis unit 20, a pressure delay osmosis unit 30, and a second reverse osmosis unit 40 .

Specifically, the hybrid seawater desalination system includes a reverse osmosis unit 10 that uses pretreatment seawater as an inductive solution, concentrates the to-be-treated water and discharges it to a concentrated source water and a first dilution seawater, A second reverse osmosis part (40) for discharging the second treated water and the second concentrated water by filtering the pretreated seawater, and a second reverse osmosis part And a pressure delayed osmotic section 30 for discharging water to the second dilution seawater and producing energy using the water as an induction solution.

The pretreatment seawater may be seawater treated to a certain level through processes such as sand filtration, microfiltration, ultrafiltration, and nanofiltration, but is not limited thereto. A part of the pretreatment seawater may be introduced into the reverse osmosis part 10 and the rest may be introduced into the second reverse osmosis part 40. In an embodiment, the apparatus may further include a flow rate controller (not shown) that controls a flow rate of a part of the pretreatment seawater and the remaining amount of the pretreatment seawater before flowing into the reverse osmosis part 10 and the second reverse osmosis part 40. It is possible to respond sensitively to the change in the flow rate of the water to be treated by adjusting the flow rate of a part of the pretreatment seawater and the rest of the seawater, and the desalination system can be operated stably. For example, when the flow rate of the water to be treated decreases, the flow rate control unit increases the remaining flow rate of the pretreatment seawater so that the desalination system can be stably operated by the filtration process by the second reverse osmosis unit 40, When the flow rate of the water to be treated is increased, the flow rate of a part of the pretreatment seawater can be increased.

The water to be treated may be sewage or reused water, and may have a lower osmotic pressure than the pretreatment seawater. Specifically, the to-be-treated water may be a low-concentration sewage or sewage-treated water having a lower osmotic pressure than seawater according to the concrete example of the hybrid seawater desalination system of the present invention, Can be. The water to be treated is filtered by the pressure delay osmosis part (30) and the forward osmosis part (10).

The forward osmosis unit 10 uses the pretreatment seawater (or a part thereof) as an inductive solution and discharges it to the first dilution seawater, thereby reducing the operating pressure of the first reverse osmosis unit 20 process, thereby reducing energy consumption.

The first reverse osmosis part 20 filters the first dilution seawater to discharge the first treated water and the first concentrated water. The first dilution seawater can be discharged from the forward osmosis unit 10 to lower the operating pressure of the first reverse osmosis unit and prolong the service life of the system. The first treated water can be used as fresh water for living, but is not limited thereto. The first concentrated water may be discharged from the system, or may be reused as an inductive solution of the forward tumbler 10 when a predetermined level of water quality is satisfied. This is explained in detail below.

The second reverse osmosis part 40 may filter the pretreatment seawater (or the remainder thereof) to discharge the second treated water and the second concentrated water. The second treated water may not be in contact with the for-treatment water, the concentrated raw water, the concentrated effluent, the first diluted seawater, the first treated water, the first concentrated water, and the second diluted seawater. There is an advantage that the public can eliminate the sense of resistance by drinking. The second concentrated water flows into the pressure delay osmosis part 30 in a state where the osmotic pressure is increased, so that the energy production efficiency can be further improved, thereby saving energy of the system as a whole.

The pressure-delayed osmotic section 30 can discharge the second concentrated water as an inductive solution to the second diluted seawater. The second dilution seawater may be discharged to the outside of the system, or may be reused as an induction solution of the forward osmosis part 10 if the water quality is above a certain level. This is explained in detail below. Since the osmotic pressure of the second concentrated water is increased by the second reverse osmosis part 40, the energy production efficiency of the pressure delay osmosis part 30 increases. In an embodiment, the pressure delay osmotic section 30 may include a turbine 31 and may rotate the turbine by osmotic pressure to produce energy, but is not limited thereto.

1, in the hybrid seawater desalination system, the water to be treated is introduced into the pressure delay osmosis unit 30 and is filtered to discharge the reused water, and the reused water is recovered by the forward osmosis unit 10 Filtered and discharged as concentrated raw water. Specifically, the for-treatment water is filtered by the pressure-delayed osmotic section 30 as reusing water, and the reusing water can be filtered as concentrated water from the forward osmosis part 10. When the for-treatment water is filtered first in the pressure delay osmotic part 30, the energy production efficiency of the pressure delay osmotic part 30 is further increased by the low osmotic pressure of the water to be treated.

In another embodiment, referring to FIG. 2, the hybrid seawater desalination system may be such that the concentrated source water is filtered at the pressure delay osmotic section 30 and discharged to the condensed effluent. Specifically, the for-treatment water is filtered by the raw water in the rectifying unit 10 and the concentrated raw water may be discharged from the pressure delay osmosis unit 30 to the concentrated discharge water. The water quality of the first dilution seawater is further improved to lower the operating pressure of the first reverse osmosis part 20 so that the energy consumption is reduced and the life of the desalination system is reduced .

In another embodiment, referring to FIG. 3, the concentrated raw water may be introduced into the pressure delay osmosis part 10 together with the water to be treated and filtered. Specifically, the untreated water further flows into the concentrated source water discharged from the normal discharge unit 10 and can be filtered in the pressure delayed osmosis unit 30. [ In this case, there is an advantage that the osmotic pressure of the concentrated raw water can be lowered and the energy production efficiency of the pressure delayed osmosis part 30 can be improved.

Each of the hybrid seawater desalination systems of the above embodiments may be operated as a separate process, or may include all necessary piping described later in one system, and may be applied to the process of each specific example according to the environment change and purpose.

The first concentrated water may be introduced into the forward osmosis together with the pretreatment seawater, and the second dilution seawater may be introduced into the forward osmosis together with the pretreatment seawater. Specifically, the first concentrated water and / or the second diluted seawater can be reused as an induction solution of the third tundish (10), so that the water treatment efficiency of the hybrid seawater desalination system can be improved.

In an embodiment, the first concentrated water may be discharged from the first reverse osmosis part 20 through the fourth pipe L4. And a first water quality monitoring unit 110 for evaluating the quality of the first concentrated water in the fourth pipe L4. When the first concentrated water satisfies a predetermined quality of water, The first concentrated water can be reused by joining the first pipe L1 through the sixteenth pipe L16 branched from the fourth pipe L4 and introducing the combined water into the second pipe L1. The fourth pipe L4 and the sixteenth pipe L16 may be provided with flow control valves 111 and 112. The fourth pipe L4 and the sixteenth pipe L16 may be connected to the fourth pipe And a control unit (not shown) for controlling the fourth pipe L4 and the sixteenth pipe L16.

Also, the second dilution seawater may be discharged from the pressure delay osmosis part 30 through the eighth piping L8. And a second water quality monitoring unit 120 for evaluating the quality of the second dilution seawater on the eighth pipeline L8. When the second dilution seawater satisfies a predetermined quality of water, The second dilution seawater can be reused by joining the first dilution seawater 10 to the first pipeline L1 through the seventeenth pipeline L17 branched from the eighth pipeline L8 and introducing the second dilution seawater 10 into the second pipeline L1. The eighth pipe L8 and the seventeenth pipe L17 may be provided with a flow rate control valve and the eighth pipe L8 and the seventeenth pipe L17 may be connected to each other in accordance with the water quality evaluation result of the second water quality monitoring unit 120. [ 17 pipe (L17).

The hybrid seawater desalination system is used for inflow and outflow of each of the for-treatment water, the first and second concentrated water, the first and second treated water, the first and second diluted seawater, the concentrated raw water, the reused water, A pipe may be provided. Specifically, the pretreatment seawater (or a part thereof) is introduced into the forward osmosis part 10 through the first pipe L1, and the first dilution seawater flows through the first reverse osmosis part The first treated water produced from the first reverse osmosis part 20 is discharged through the third pipe L3 and the pre-treated seawater (or the remainder thereof) flows through the fifth pipe L5 The second treated water generated from the second reverse osmosis unit 40 is discharged through the sixth pipe L6 and the second concentrated water is discharged through the seventh pipe L7, To the pressure delay osmosis part (30). The second pipe (L2) or the fifth pipe (L5) may have a pump to facilitate the transfer of the first dilution seawater and / or the pretreatment seawater (or the rest thereof). For example, the pump may be a high pressure pump.

The water to be treated can be introduced and discharged into different pipes by different respective processes according to specific embodiments.

1, the to-be-treated water flows into the pressure-delayed osmotic section 30 through the ninth pipe L9, and the recycled water produced from the pressure- 10 pipeline L10 and the concentrated raw water produced by the rectifying unit 10 can be discharged through the eleventh pipeline L11.

2, the to-be-treated water flows into the forward osmosis unit 10 through the twelfth pipe L12 and the concentrated water produced from the forward osmosis unit 10 flows through the thirteenth pipe L13 And the concentrated effluent produced from the pressure delayed osmotic section 30 may be discharged through the fourteenth pipe L14.

In another embodiment, referring to FIG. 3, the additional for-treatment water may be introduced into the pressure delay osmosis part together with the concentrated raw water through the fifteenth piping L15. For example, the fifteenth pipe L15 may join the thirteenth pipe L13.

Water treatment  Way

In another aspect of the present invention, the water treatment method includes the steps of: discharging pretreatment seawater (or a part thereof) as an induction solution to a first dilution seawater; filtering the first dilution seawater to remove the first treated water and the first concentrated water (Or the remainder thereof) to discharge the second treated water and the second concentrated water, and discharging the second concentrated water to the second diluted seawater using the second concentrated water as an induction solution, The method comprising the step of producing a hybrid seawater desalination system.

The water treatment method can produce the first treated water by filtering the first diluted seawater having improved water quality, thereby reducing energy consumption and extending the life of the hybrid seawater desalination system. In addition, there is an advantage in that energy production efficiency can be increased by producing energy by using the second concentrated water as the induction solution, and the pretreatment seawater (or the remainder thereof) is produced as the second treated water by a separate route, 2 It is possible to eliminate the feeling of rejecting the use of treated water for drinking.

The water to be treated may be filtered by a pressure delayed osmosis unit using the second concentrated water as an inductive solution and an osmosis unit using the pretreatment seawater (or a part thereof) as an induction solution.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is to be understood, therefore, that the embodiments described above are intended to be illustrative in all respects and not restrictive.

10: three-sided cutting 20: first reverse osmosis
30: pressure delay osmosis part 31: turbine
40: second reverse osmosis part 110: first water quality monitoring part
111, 112 Flow control valve 120: Second water quality monitoring section
121 and 122: Flow control valves L1 to L15: First to 15th pipes

Claims (21)

A pretreatment seawater is used as an inductive solution, and the water to be treated is concentrated and discharged to the concentrated water and the first diluted seawater, respectively;
A first reverse osmosis unit for filtering the first dilution seawater to discharge the first treated water and the first concentrated water, respectively;
A second reverse osmosis part for filtering the pretreatment seawater to discharge the second treated water and the second concentrated water, respectively; And
A pressure delayed osmotic section for discharging the second concentrated water as an induction solution to the second dilution seawater and producing energy;
The desalination system comprising:
The method according to claim 1,
Wherein the for-treatment water is sewage or reused water, and has a lower osmotic pressure than the pretreatment seawater.
The method according to claim 1,
Wherein the first concentrated water is introduced into the first compartments together with the pretreatment seawater.
The method according to claim 1,
And the second dilution seawater is introduced into the third desulfurization together with the pretreatment seawater.
The method according to claim 1,
Wherein the water to be treated is introduced into the pressure delay osmosis part and is filtered to discharge the reused water, and the reused water is recovered and filtered by the forward osmosis and discharged to the concentrated source water.
The method according to claim 1,
Wherein the concentrated raw water is filtered in the pressure delay osmosis part and discharged to a concentrated discharge water.
The method according to claim 6,
And the concentrated raw water flows into the pressure delay osmosis part together with the water to be treated and is filtered.
The method according to claim 1,
The first concentrated water is discharged through the fourth pipe,
The fourth pipe is provided with a first water quality monitoring unit for evaluating the quality of the first concentrated water,
And the first concentrated water satisfying a predetermined quality of water joins the first pipe through the sixteenth pipe branched from the fourth pipe and flows into the third pipe.
The method according to claim 1,
The second dilution seawater is discharged through the eighth pipeline,
Wherein the eighth pipe is provided with a second water quality monitoring unit for evaluating the water quality of the second dilution seawater,
And the second dilute seawater satisfying a predetermined quality of water joins the first pipeline through the seventeenth pipeline branched from the eighth pipeline and flows into the third pipeline.
The method according to claim 1,
A part of the pretreatment seawater is introduced into the fresh water tank through the first pipe,
Wherein the first dilution seawater flows into the first reverse osmosis part through a second pipe,
The first treated water produced from the first reverse osmosis portion is discharged through the third pipe,
The remainder of the pretreatment seawater flows into the second reverse osmosis part through the fifth pipe to produce second treated water and second concentrated water,
Wherein the second treated water is discharged through a sixth piping, and the second concentrated water flows into the pressure delayed osmosis part through a seventh pipeline.
6. The method of claim 5,
The water to be treated flows into the pressure delay osmosis part through the ninth pipe,
The reclaimed water produced from the pressure delay osmosis part is introduced into the third tub through the tenth pipe,
And the concentrated raw water produced from the third tundish is discharged through the eleventh pipeline.
The method according to claim 6,
The untreated water is introduced into the third trough through the twelfth pipe,
The concentrated raw water produced from the purified water is introduced into the pressure delay osmosis part through the thirteenth pipe,
And the concentrated effluent produced from the pressure delay osmosis part is discharged through the 14th piping.
8. The method of claim 7,
And the for-treatment water is joined to the concentrated water through a fifteenth pipe.
The method according to claim 1,
Wherein the pressure delay osmotic section comprises a turbine.
11. The method of claim 10,
And the second piping or the fifth piping is provided with a pump.
9. The method of claim 8,
And the fourth piping and the sixteenth piping each include a flow control valve.
10. The method of claim 9,
Wherein the eighth piping and the seventeenth piping comprise flow control valves.
The method according to claim 1,
The second treated water does not come into contact with the water to be treated, the concentrated raw water, the concentrated effluent, the first diluted seawater, the first treated water, the first concentrated water, and the second diluted seawater.
11. The method of claim 10,
Further comprising a flow regulator for regulating a portion of the pretreatment seawater and the remaining amount of the pretreatment seawater.
Using a portion of the pretreated seawater as an inductive solution and discharging it to the first dilution seawater;
Filtering the first dilution seawater to discharge the first treated water and the first concentrated water;
Filtering the remainder of the pretreated seawater to discharge the second treated water and the second concentrated water; And
Using the second concentrated water as an inductive solution, discharging the second concentrated water to second dilute seawater, and producing energy;
19. The method of any of claims 1 to 19, wherein the desalination process is performed using a hybrid seawater desalination system.
21. The method according to claim 20,
A pressure-delayed osmotic part using the second concentrated water as an induction solution,
Wherein a part of the pretreatment seawater is filtered by a reverse osmosis treatment using an induction solution.

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