KR101184651B1 - Forward osmotic desalination device for using osmotic membrane submerged in salty water and nanofilter and the method thereof - Google Patents

Abstract

The present invention relates to an apparatus and method for dipping a saltwater reservoir immersion type forward osmosis desalination of an osmosis membrane using an osmosis membrane and a nanofilter, and in particular, a brine inlet and outlet through which brine flows in and out, a solution inlet through which a concentrated induction solution is supplied, and an osmosis membrane. An osmosis membrane module having a solution outlet through which fresh water induced by brine is mixed to discharge the diluted solution; A storage tank having an inlet port and an outlet port so that the brine flows in and out, and a predetermined amount of brine is stored therein, and the osmosis membrane module is immersed below the brine level; A solution discharge pipe connected to the solution discharge port of the osmosis membrane module; A nano filter configured to connect the solution discharge pipe and its inlet to recover fresh water from the diluted induction solution, discharge the fresh water through the discharge port, and discharge the concentrated induction solution through the discharge port; A pressurized pump installed at the front end of the inlet of the nanofilter to pressurize the diluted induction solution to supply the nanofilter; And a concentrated solution recovery pipe connecting the outlet of the nanofilter and the solution inlet of the osmosis membrane module.
According to the present invention as described above, by using the humic acid aqueous solution as the osmotic induction solution, the high solubility and low viscosity of the humic acid causes high osmotic pressure and at the same time minimizes the decrease in freshwater production flow due to concentration polarization. It is possible to secure continuous fresh water production, guarantee the quality of the water produced by applying nano filter which has a significantly smaller permeate molecular weight than humic acid, and the pressure applied to nano filter is less than 40% of reverse osmosis. Since the pump is unnecessary, and thus the energy consumption for driving the high pressure pump is reduced by more than 60%, the production cost can be greatly reduced, and a plurality of tubular or hollow fiber osmosis membrane modules can be connected to the nano filter and the minimum pipe connection unit. UNIT) can simplify the design and operation of desalination systems.

Description

FORWARD OSMOTIC DESALINATION DEVICE FOR USING OSMOTIC MEMBRANE SUBMERGED IN SALTY WATER AND NANOFILTER AND THE METHOD THEREOF}

The present invention relates to a brine reservoir immersion type forward osmosis desalination apparatus and method of the osmosis membrane, and specifically to recover fresh water from salt water, such as seawater, brackish water, sewage treatment effluent, the influent brine is bound to the osmosis membrane The osmotic pressure difference between the induction solution with the osmotic pressure higher than the influent brine on the other side causes the fresh water in the brine to pass through the osmosis membrane, and the fresh water and the diluted induction solution passed through the membrane by the osmotic pressure are collected by the nanofilter and recovered again and continuously circulated. The present invention relates to an osmosis membrane and an osmotic membrane using a nanofilter to produce a production water that has passed through a nanofilter.

Desalination methods are largely classified into evaporation and membrane filtration.

Currently, desalination technology is rapidly being converted to membrane separation based on the improvement of membrane performance and the reduction of production cost in order to overcome the high energy and high cost required by the evaporation method. In the future, desalination technology will focus on reducing the cost of freshwater production by reverse osmosis. However, the premise that fresh water can be produced only by overcoming the osmotic pressure of brine is applied. For example, seawater has an osmotic pressure of 25 atm or more, and considering the loss of pressure in the reverse osmosis membrane, it must be operated at a minimum of 40 atm. Regardless of low-cost film production, the limit is reached.

The desalination technology that has recently attracted attention by being separated from such reverse osmosis technology is forward osmosis technology.

Forward osmosis technology uses fresh water in the brine to pass through the semipermeable membrane to maintain equilibrium concentrations between the forward osmosis membrane and at least equal or greater osmotic pressure than that of the saline solution, ie the difference in osmotic pressure between the forward osmosis draw solutions. To recover fresh water.

In the case of forward osmosis desalination technology, the recovery of fresh water occurs naturally due to osmotic pressure difference, so that fresh water can be produced with no power, but energy is needed to recover only fresh water from induction solution including fresh water. Depending on the nature of the solute, the energy required can vary and even be greater than the energy consumption for reverse osmosis. Therefore, the core of forward osmosis technology depends on minimizing the energy required to recover and circulate the solute in the induction solution causing osmosis.

Therefore, in order to continuously reduce the production cost of desalination technology, it is essential to select an appropriate induction solution, apply concentration and efficient recovery of induction solute, and develop an exclusive osmosis membrane and applicable module in forward osmosis desalination technology.

The present invention is to meet the above requirements, a plurality of parallel tubular or hollow fiber osmosis membrane module for recovering fresh water from the influent brine, the osmotic pressure is higher than the influent brine to induce freshwater recovery from the influent brine, From the dilution of fresh water and induction solution recovered from the influent brine using humic acid as an induction solution, which is stable in nature, has high solubility in water, and has low viscosity and can cause high osmotic pressure. Produced water (final fresh water) and the remaining induction solution is circulated through the nanofilter to recover fresh water from the osmosis membrane. To save energy by at least 60%, and to be easy to operate and maintain. Is there is provided an osmotic membrane brine storage tank submerged forward osmosis desalination device and a method using a permeable membrane and a nano-filter.

According to an aspect of the present invention,

An osmosis membrane module having a brine inlet and outlet through which the brine is introduced and discharged, a solution inlet through which the concentrated induction solution is supplied, and a solution outlet through which fresh water derived from the brine by the osmosis membrane is mixed and the diluted induction solution is discharged; A storage tank having an inlet port and an outlet port so that the brine flows in and out, and a predetermined amount of brine is stored therein, and the osmosis membrane module is immersed below the brine level; A solution discharge pipe connected to the solution discharge port of the osmosis membrane module; A nano filter configured to connect the solution discharge pipe and its inlet to recover fresh water from the diluted induction solution, discharge the fresh water through the discharge port, and discharge the concentrated induction solution through the discharge port; A pressurized pump installed at the front end of the inlet of the nanofilter to pressurize the diluted induction solution to supply the nanofilter; And a concentrated solution recovery pipe connecting the outlet of the nanofilter and the solution inlet of the osmosis membrane module.

Here, the osmosis membrane module is formed in a hollow shape, the pressure case is formed with a plurality of the brine inlet and outlet; A pressure cover having an inner hemispherical shape and having a solution inlet and a solution outlet formed at each end thereof and coupled to upper and lower ends of the pressure case; And an osmotic membrane formed in a bundle of tubular or hollow fiber shapes, each upper and lower end of which is fixed in parallel to a disk-shaped fixing member and installed in the longitudinal direction thereof in the pressure case.

Here, the osmosis membrane module may allow the brine stored in the storage tank to be introduced into the pressure case through a plurality of the brine inlets and outlets to be in contact with the outside of the osmosis membrane, and the fresh water contained in the brine may pass through the inside of the osmosis membrane. The osmotic pressure of the concentrated induction solution flows through the osmosis membrane to be mixed with the induction solution, and the fresh water is recovered so that the concentrated brine is discharged to the storage tank through a plurality of the brine inlets and outlets. The induction solution diluted by mixing fresh water flowing through the solution is pumped to the nanofilter through the solution outlet and the solution discharge pipe, and the fresh water in the induction solution mixed with the fresh water by the nanofilter is produced through the freshwater outlet. And drain the concentrated draw solution with the outlet of the nanofilter. The solution is introduced into the solution inlet through the solution return pipe and circulated.

In addition, the induction solution is a humic acid (humic acid) aqueous solution, the concentration of the humic acid aqueous solution is determined in a range from the concentration showing the osmotic pressure equal to the osmotic pressure of the incoming brine to the saturated solubility of the concentration.

Here, the nanofilter uses a specification that the molecular weight of the permeation is smaller than the molecular weight of the humic acid used as the induction solution.

Here, the osmosis membrane module is composed of one unit (UNIT) is provided with a plurality of parallel in parallel, the number of installation of the osmosis membrane module to the permeate flow rate of the nano-filter at the same pressure fresh water recovery of the osmosis membrane module It is determined by dividing by the flow rate, and the number of osmosis membrane modules of the unit is determined in a range in which the freshwater recovery flow rate does not exceed the permeation amount of the nanofilter.

Here, in the brine reservoir immersion type forward osmosis desalination apparatus of the osmosis membrane using the osmosis membrane and the nanofilter, an electric conductivity meter is installed on the concentrated solution recovery pipe, and a flowmeter is installed at the rear end of the fresh water outlet of the nanofilter. The controller further includes a controller that automatically notifies the occurrence of abnormality when the electrical conductivity of the electrical conductivity meter increases by 10% from the reference value or the flow rate of the flowmeter decreases by 10% from the flow reference value.

According to another aspect of the present invention,

In the forward osmosis desalination method using the osmosis membrane and the osmosis membrane brine storage tank immersion forward osmosis desalination apparatus using the osmosis membrane and the nano-filter, the brine concentration process of contacting the brine to the outside of the osmosis membrane by introducing the osmosis membrane module ; A forward osmosis process of supplying the concentrated induction solution to have a flow in one direction inside the osmosis membrane of the osmosis membrane module to separate and discharge fresh water from the brine by osmotic pressure; A dilute solution discharge process of discharging the induction solution diluted with fresh water in the osmosis membrane module to the nanofilter; And separating the induction solution diluted in the nanofilter to each other to discharge fresh water production water to the outside, and circulating and supplying the concentrated induction solution to the osmosis membrane module.

Here, in the brine reservoir immersion type forward osmosis desalination method of the osmosis membrane using the osmosis membrane and the nano-filter, the electrical conductivity measured from the electrical conductivity meter installed on the concentrated solution recovery pipe 10% higher than the reference value or the fresh water outlet of the nano-filter The method further includes a monitoring process for automatically notifying an occurrence of an abnormality when the flow rate measured from the flow meter installed at the rear end of the flow rate decreases by 10% from the flow rate reference value.

According to the present invention, the osmosis membrane and the osmosis membrane immersion type forward osmosis desalination apparatus and method using the osmotic membrane and the nano-filter according to the present invention, the solubility of the humic acid in water and the viscosity of the humic acid as large as the osmotic induction solution is used Due to its small size, high osmotic pressure can be minimized, and the reduction of freshwater production flow due to concentration polarization can be minimized to ensure continuous freshwater production. As the pressure applied to the nanofilter is less than 40% of reverse osmosis, a high pressure pump is unnecessary, and as a result, energy consumption for driving the high pressure pump is reduced by more than 60%, thereby greatly reducing the production cost. And a plurality of tubular or hollow fiber osmosis membrane modules with a minimum of With the condensation unit (UNIT), the design and operation of the desalination system can be simplified.

Figure 1 is a schematic diagram showing the configuration of the salt water reservoir immersion type forward osmosis desalination apparatus of the osmosis membrane using the osmosis membrane and the nano-filter according to the present invention.
Figure 2 is a perspective view showing the configuration of the osmosis membrane module of the saline reservoir submerged forward osmosis desalination apparatus of the osmosis membrane using the osmosis membrane and the nano-filter according to the present invention.
FIG. 3 is an exploded perspective view of FIG. 2. FIG.
4 is a side cross-sectional view of FIG. 2.
Figure 5 is a flow chart for explaining a saline reservoir immersion type forward osmosis desalination method of the osmosis membrane using the osmosis membrane and the nano-filter according to the present invention.

Hereinafter, with reference to the accompanying drawings the configuration of the saline reservoir immersion type forward osmosis desalination apparatus of the osmosis membrane using the osmosis membrane and the nano-filter according to the present invention will be described in detail.

In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

Figure 1 is a schematic diagram showing the configuration of the salt osmosis tank immersion forward osmosis desalination apparatus of the osmosis membrane using the osmosis membrane and the nano-filter according to the present invention, Figure 2 is a salt storage tank immersion type of the osmosis membrane using the osmosis membrane and the nano-filter according to the present invention. It is a perspective view which shows the structure of an osmosis membrane module in osmosis desalination apparatus, FIG. 3 is an exploded perspective view of FIG. 2, and FIG. 4 is a side sectional view of FIG.

1 to 4, the saline reservoir immersion forward osmosis desalination apparatus 100 of the osmosis membrane using the osmosis membrane and the nano-filter according to the present invention, the osmosis membrane module 110, the storage tank 120, and the solution discharge The pipe 130, the nano filter 140, the pressure pump 150, and the concentrated solution recovery pipe 160 are configured.

First, the osmosis membrane module 110 is composed of a pressure case 111, a pressure cover 113, and the osmosis membrane 115.

The pressure case 111 is formed of a stainless steel or reinforced acrylic material in a hollow shape, and brine, such as seawater, brackish water, and sewage treatment effluent, is introduced into the side, and concentrated water is concentrated at the bottom of the side by separating fresh water from the brine. A plurality of brine inlets and outlets 111a through which the water is discharged, that is, the brine flows, are formed. Here, it is preferable that the pressure case 111 protrudes from the upper and lower inner circumferential surfaces of the first fixing jaw 111c to which the fixing member 115a of the osmosis membrane 115 to be described below is fixed. Here, the pressure case 111 is preferably formed on the inner peripheral surface of the upper and lower end thread tabs 111d for coupling with the pressure cover 113 to be described below, in addition to the screw tab, clamping method, hook coupling, welding coupling, etc. May be combined.

The pressure cover 113 is formed in the same material as the pressure case 111 to have an empty hemispherical shape so as to equally supply pressure and flow rate to the osmosis membrane 115, and a draw solution concentrated in the pressure case 111 (draw). A solution inlet 113a and a solution outlet 113b are formed at each end to introduce a solution) to discharge the induction solution diluted by mixing fresh water, and are coupled to upper and lower ends of the pressure case 111. Here, the pressure cover 113 preferably has a second fixing jaw 113c protruding from the inner circumferential surface of the fixing member 115a of the osmosis membrane 115. Here, the pressure cover 113 is preferably formed with a thread tab 113d for coupling with the pressure cover 113 on the lower outer circumferential surface, and may be coupled by a clamp method, a hook coupling, a welding coupling, etc. in addition to the screw tab. have. In this case, the induction solution uses a high solubility and low viscosity in water and a humic acid aqueous solution which is present in a stable state in nature, and the concentration of the humic acid aqueous solution is from the concentration which shows the same osmotic pressure as the osmotic pressure of the incoming brine. It is determined in the range up to the saturated solubility of.

The osmosis membrane 115 is formed in a bundle of tubular or hollow fiber, and the upper and lower ends thereof are fixed in parallel to the fixing member 115a in the form of a disk and installed in the longitudinal direction thereof in the pressure case 111. Here, the fixing member 115a is preferably formed integrally with the upper and lower ends of the osmosis membrane 115 with a resin material such as resin for sealing the outer surface of the osmosis membrane 115. At this time, when the fixing member 115a of the osmosis membrane 115 is installed between the first fixing jaw 111c of the pressure case 111 and the second fixing jaw 113c of the pressure cover 113, the cross section thereof for watertightness. It is preferable that a packing 117 having a shape of "dimple" is provided, and the O-ring 119 is provided between the thread tap 111d of the pressure case 111 and the thread tap 113d of the pressure cover 113. desirable.

On the other hand, the osmosis membrane module 110 is composed of one unit (UNIT) is installed a plurality of parallel, permeate flow rate of the nano-filter 140 to be described below the number of the osmosis membrane module 110 at the same pressure It is determined by dividing by the freshwater recovery flow rate of the osmosis membrane module 110, the number of the osmosis membrane module 110 of the unit is determined in the range that the freshwater recovery flow rate does not exceed the permeation amount of the nano-filter 140.

In addition, the storage tank 120 is provided with an inlet 121 through which the brine is introduced and an outlet 123 through which the concentrated water is discharged so that a predetermined amount of saline is stored therein, and the osmosis membrane module is immersed below the brine level. Here, the storage tank 120 is provided with a stirrer 125 so that the concentration of the brine is uniform.

In addition, the solution discharge pipe 130 is connected to the solution discharge port 113b formed in the pressure cover 113 of the osmosis membrane module 110. Here, the solution discharge pipe 130 is preferably connected in parallel with the solution outlet (113b) of each osmosis membrane module 110 in a branched manner.

In addition, the nano filter 140 is connected to the solution discharge pipe 130 and its inlet 141 is installed, recovering fresh water from the diluted induction solution, discharged through the fresh water outlet 143, and the concentrated induction solution Discharge through the outlet 145. Here, the nano filter 140 uses a specification that the molecular weight of the permeation is smaller than the molecular weight of the humic acid used as the induction solution.

In addition, the pressure pump 150 is installed at the front end of the inlet 141 of the nano filter 140 on the solution discharge pipe 130 to pressurize the diluted induction solution to supply to the nano filter 140.

Meanwhile, the concentrated solution recovery pipe 160 connects the outlet 145 of the nanofilter 140 and the solution inlet 113a formed in the pressure cover 113 of the osmosis membrane module 110. Here, the concentrated solution recovery pipe 160 is preferably connected in parallel with the solution inlet (113a) of each osmosis membrane module (110).

In addition, the forward osmosis desalination apparatus 100 using the osmosis membrane and the nanofilter according to the present invention installs the electrical conductivity meter 170 on the concentrated solution recovery pipe 160, and the fresh water outlet 143 of the nanofilter 140. The controller 190 automatically generates an abnormality when the flowmeter 180 is installed at the rear end of the c) and the electrical conductivity of the electrical conductivity meter 170 increases by 10% from the reference value or the flow rate of the flowmeter 180 decreases by 10% from the flow reference value. Notify by. In this case, various methods such as an alarm, a warning light, and an SMS may be applied.

Hereinafter, the saline reservoir immersion type forward osmosis desalination method of the osmosis membrane using the osmosis membrane and the nanofilter according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 5 is a flow chart for explaining a saline reservoir immersion type forward osmosis desalination method of the osmosis membrane using the osmosis membrane and the nano-filter according to the present invention.

Referring to FIG. 5, when the salt water is collected in the storage tank 120 and maintains a constant flow rate, the salt water is freely introduced into the pressure case 111 through the plurality of salt water inlets and outlets 111a of the osmosis membrane module 110.

At the same time, the concentrated induction solution flows into the solution inlet 113a of the osmosis membrane module 110 through the concentrated solution recovery pipe 160 and flows in one direction within the osmosis membrane 115 to generate osmotic pressure. Fresh water in the brine is separated.

Then, the brine concentrated and separated from the fresh water, that is, the concentrated water is discharged to the storage tank 120 again through the brine inlet and outlet 111a, and mixed with the brine in the storage tank 120 to be diluted. At this time, the storage tank 120 is always introduced through a constant amount of salt water through the inlet 121, the constant amount of salt water is always discharged through the outlet 123, the concentration of the brine because the stirrer 125 is stirred inside Stays constant.

Subsequently, the induction solution diluted with fresh water is introduced into the inlet 141 of the nanofilter 140 through the solution outlet 113b of the osmosis membrane module 110 and the solution discharge pipe 130. At this time, the induction solution diluted by the pressure pump 150 is pressurized and supplied to the nano-filter 140.

Then, the fresh water is recovered from the induction solution diluted in the nano-filter 140, discharged through the fresh water outlet 143, and discharged the concentrated induction solution through the outlet 145, recovery of the concentrated solution of the concentrated induction solution It is introduced into the solution inlet 113a of the osmosis membrane module 110 through the pipe 160.

Thus, the induction solution is continuously circulated and fresh water is continuously produced in the nanofilter 140 by continuously supplying the brine.

On the other hand, the controller 190 monitors the electrical conductivity meter 170 and the flow meter 180, the electrical conductivity of the electrical conductivity meter 170 is increased by 10% than the reference value or the flow rate of the flow meter 180 is 10 than the flow reference value Automatically notify of abnormality when% decreases. In this case, when the flow rate of the flow meter 180 is reduced by 10% from the flow rate reference value, the nanofilter 140 is cleaned or replaced, and when the electrical conductivity is increased by 10% from the reference value, the osmosis membrane module 110 is cleaned or replaced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is to be understood, however, that the invention is not to be limited to the specific forms thereof, which are to be considered as being limited to the specific embodiments, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims. .

110: osmosis membrane module 120: storage tank
130: solution discharge pipe 140: nano filter
150: pressurized pump 160: concentrated solution recovery pipe
170: electrical conductivity meter 180: flow meter
190 controller

Claims (9)

Induction solution using a brine inlet and outlet where the brine is introduced and discharged, and a humic acid aqueous solution, and the concentration of the humic acid solution is determined from the concentration of osmotic pressure equal to the osmotic pressure of the brine to which the brine is introduced to the saturated solubility of the corresponding concentration. An osmosis membrane module having the concentrated solution supplied inlet and a solution outlet through which a fresh solution derived from brine by the osmotic membrane is mixed and the diluted induction solution is discharged;
A storage tank having an inlet port and an outlet port so that the brine flows in and out, and a predetermined amount of brine is stored therein, and the osmosis membrane module is immersed below the brine level;
A solution discharge pipe connected to the solution discharge port of the osmosis membrane module;
A nano filter configured to connect the solution discharge pipe and its inlet to recover fresh water from the diluted induction solution, discharge the fresh water through the discharge port, and discharge the concentrated induction solution through the discharge port;
A pressurized pump installed at the front end of the inlet of the nanofilter to pressurize the diluted induction solution to supply the nanofilter; And
An osmosis membrane immersion type forward osmosis desalination apparatus for an osmosis membrane using an osmosis membrane and a nanofilter, characterized in that it comprises a concentrated solution recovery pipe connecting the outlet of the nanofilter and the solution inlet of the osmosis membrane module. The method of claim 1,
The osmosis membrane module,
A pressure case formed in a hollow shape and having a plurality of salt water inlets and outlets formed therein;
A pressure cover having an inner hemispherical shape and having a solution inlet and a solution outlet formed at each end thereof and coupled to upper and lower ends of the pressure case; And
It is formed in a bundle of tubular or hollow fiber, each of the upper and lower ends is fixed in parallel to the disk-shaped fixing member made of an osmosis membrane, characterized in that the osmosis membrane is installed in the longitudinal direction in the pressure case using an osmosis membrane and a nano-filter Saline reservoir submerged forward osmosis desalination device of osmosis membrane. The method of claim 2,
The osmosis membrane module,
The brine stored in the storage tank is introduced into the pressure case through a plurality of brine inlet and outlet to be in contact with the outside of the osmosis membrane, and the osmotic pressure difference with the concentrated induction solution flowing through the inside of the osmosis membrane of fresh water contained in the brine By passing through the osmosis membrane and mixed with the induction solution to flow, fresh water is recovered and concentrated brine is discharged to the storage tank through a plurality of the brine inlet and outlet, and the fresh water flowing through the osmosis membrane is mixed and diluted induction The solution is pumped to the nanofilter through the solution outlet and the solution discharge pipe so that fresh water in the induction solution mixed with fresh water by the nanofilter is discharged through the freshwater outlet as production water, and the concentrated induction solution is The solution through the outlet of the nanofilter and the concentrated solution recovery pipe To flow into the inlet by the osmotic membrane and the nano-filter, comprising a step of circulating osmosis membrane brine storage tank submerged forward osmosis desalination unit. delete The method of claim 1,
The nano filter,
A salt storage tank immersed forward osmosis desalination apparatus for an osmosis membrane using an osmosis membrane and a nanofilter, characterized in that a standard having a smaller permeation molecular weight than that of a humic acid used as an induction solution is used. The method of claim 1,
The osmosis membrane module,
Multiple units are installed in parallel and consist of one unit. The number of osmosis membrane modules is determined by dividing the permeate flow rate of the nanofilter at the same pressure by the freshwater recovery flow rate of the osmosis membrane module. The osmosis membrane immersion forward osmosis desalination apparatus of the osmosis membrane using the osmosis membrane and the nano-filter, characterized in that the number of osmosis membrane module is determined in the range that the freshwater recovery flow rate does not exceed the permeation amount of the nanofilter. The method of claim 1,
The saline reservoir immersion type forward osmosis desalination apparatus of the osmosis membrane using the osmosis membrane and the nano-filter,
An electric conductivity meter is installed on the concentrated solution return pipe, and a flow meter is installed at the rear end of the fresh water outlet of the nanofilter so that the electric conductivity of the electric conductivity meter increases by 10% from the reference value or the flow rate of the flow meter is 10 than the flow reference value. Saline reservoir immersion forward osmosis desalination device of the osmosis membrane using the osmosis membrane and the nano-filter characterized in that it further comprises a controller for automatically notifying the occurrence of abnormalities when the% decrease. In the forward osmosis desalination method using the saline reservoir submerged forward osmosis desalination apparatus of the osmosis membrane using the osmosis membrane and nano-filter of claim 1,
A brine concentration step of bringing the brine into contact with the outside of the osmosis membrane by introducing an osmosis membrane module into a storage tank in which the brine is stored;
A forward osmosis process of supplying the concentrated induction solution to have a flow in one direction inside the osmosis membrane of the osmosis membrane module to separate and discharge fresh water from the brine by osmotic pressure;
A dilute solution discharge process of discharging the induction solution diluted with fresh water in the osmosis membrane module to the nanofilter; And
Separating the induction solution diluted in the nano-filter mutually to discharge the fresh water production water to the outside, and the osmosis membrane and nano-filter comprising a production water separation process for circulating the concentrated induction solution to the osmosis membrane module Saline reservoir submerged forward osmosis desalination method of the osmosis membrane by using. The method of claim 8,
The saline reservoir submerged forward osmosis desalination method of the osmosis membrane using the osmosis membrane and the nano-filter,
When the electrical conductivity measured from the electrical conductivity meter installed on the concentrated solution return pipe increases by 10% from the reference value or the flow rate measured by the flowmeter installed at the rear end of the fresh water outlet of the nanofilter decreases by 10% from the flow reference value, an abnormality is automatically generated. Saline reservoir immersion type forward osmosis desalination method of the osmosis membrane using an osmosis membrane and a nano-filter characterized in that it further comprises a monitoring step of notifying.

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