KR101184652B1 - Forward osmotic desalination device for using osmotic membrane and nanofilter and the method thereof - Google Patents

Abstract

The present invention relates to an apparatus and method for forward osmosis desalination using an osmosis membrane and a nano-filter, in particular, a brine inlet through which brine is introduced, a brine outlet through which concentrated brine is discharged, and a solution inlet through which the concentrated induction solution is supplied. And an osmosis membrane module having a solution outlet through which fresh water induced in the brine by the osmosis membrane is mixed and the diluted induction solution is discharged. 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 pressurizing pump installed at the front end of the inlet of the nanofilter and pressurizing the diluted induction solution to supply the nanofilter; A concentrated solution recovery pipe connecting the outlet of the nanofilter and the solution inlet of the osmosis membrane module; A brine inlet pipe connected to the brine inlet of the osmosis membrane module to supply brine; And a concentrated water discharge pipe connected to the concentrated water outlet of the osmosis membrane module to discharge the concentrated water.
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

Apparatus and method for forward osmosis desalination using osmosis membrane and nanofilters {FORWARD OSMOTIC DESALINATION DEVICE FOR USING OSMOTIC MEMBRANE AND NANOFILTER AND THE METHOD THEREOF}

The present invention relates to an apparatus and method for forward osmosis desalination, and more particularly, to recovering fresh water from salt water, such as seawater, brackish water, and sewage treatment effluent. Due to the osmotic pressure difference with the high osmotic induction solution, fresh water in the brine passes through the osmosis membrane, and the water and the diluted induction solution passed through the membrane by osmotic pressure are transported to the nanofilter and recovered again and continuously circulated. The present invention relates to a forward osmosis desalination apparatus and a method using an osmosis membrane and a nanofilter to produce the produced water.

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 an osmosis technology.

The osmotic technique uses fresh water in the brine to pass fresh water through the semipermeable membrane to maintain equilibrium concentrations between the osmosis membrane and at least equal or greater osmotic pressure than the saline solution, i.e. the difference in osmotic pressure between the osmotic draw solutions. Recover.

In the case of osmotic 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 energy required can vary, and even greater than the energy consumption for reverse osmosis. Therefore, the core of osmotic technology is to minimize the energy required to recover and circulate the solute in the induction solution causing the osmotic phenomenon.

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

The present invention is to meet the above demands, connecting 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, so that the recovery rate of fresh water through the osmosis membrane is high, and the contamination of the membrane and the polarization of the inner and outer concentration of the membrane can be minimized. To save energy by at least 60%, and to be easy to operate and maintain. It is there is provided a forward osmosis desalination device and a method using a permeable membrane and the nano-filter.

According to an aspect of the present invention,

A brine inlet through which brine flows in, a brine outlet through which concentrated brine is discharged, a solution inlet through which a concentrated induction solution is supplied, and a fresh solution derived from the brine by the osmotic membrane, and a solution in which the diluted induction solution is discharged. An osmosis membrane module having an outlet; 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 pressurizing pump installed at the front end of the inlet of the nanofilter and pressurizing the diluted induction solution to supply the nanofilter; A concentrated solution recovery pipe connecting the outlet of the nanofilter and the solution inlet of the osmosis membrane module; A brine inlet pipe connected to the brine inlet of the osmosis membrane module to supply brine; And a concentrated water discharge pipe connected to the concentrated water outlet of the osmosis membrane module to discharge the concentrated water.

Here, the osmosis membrane module and the pressure case is formed with the brine inlet and the concentrated water outlet in the upper and lower sides; 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 is a concentrated induction solution in which the brine introduced into the pressure case through the brine inlet pipe and the brine inlet contacts the outside of the osmosis membrane, and the fresh water contained in the brine flows through the interior of the osmosis membrane. By osmotic pressure difference with and through the osmosis membrane and mixed with the dilute induction solution flows, fresh water is recovered and concentrated brine is discharged continuously through the concentrated water outlet and the concentrated water discharge pipe and at the same time The diluted induction solution flowing through the solution outlet port is discharged through the solution outlet pipe to be pushed into the nanofilter, and the fresh water in the induction solution mixed with fresh water by the nanofilter is produced through the freshwater outlet port. To be discharged, the concentrated solution is drawn through the outlet of the nano-filter Once discharged, it is circulated through the concentrated solution return pipe to the solution inlet.

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, the forward osmosis desalination apparatus using the osmosis membrane and the nano-filter is provided with an electrical conductivity meter on the concentrated solution recovery pipe, and installed a flow meter at the rear end of the fresh water outlet of the nano-filter to the electricity of the electrical conductivity meter The controller further includes a controller that automatically notifies occurrence of abnormality when the conductivity increases by 10% from the normal reference value or when 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 forward osmosis desalination apparatus using the osmosis membrane and the nano-filter, the brine is supplied to discharge the natural water or pressurized after the brine is taken to have a certain flow to the outside of the osmosis membrane of the osmosis membrane module. Process; An osmosis process of supplying the concentrated induction solution into the osmosis membrane of the osmosis membrane module so as to have a flow in a direction opposite to that of the brine to separate 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, the forward osmosis desalination method using the osmosis membrane and the nano-filter is an electrical conductivity measured from the electrical conductivity meter installed on the concentrated solution recovery pipe 10% increase from the reference value or from the flow meter installed at the rear end of the fresh water outlet of the nano-filter The method further includes a monitoring process that automatically notifies the occurrence of abnormality when the measured flow rate decreases by 10% from the flow rate reference value.

According to the apparatus and method for forward osmosis desalination using the osmotic membrane and the nano-filter of the present invention configured as described above, the high osmotic pressure due to the high solubility of water and the low viscosity of the humic acid is increased by using the aqueous humic acid solution as the osmotic induction solution. At the same time, it is possible to secure continuous freshwater production by minimizing the decrease of freshwater production flow due to concentration polarization, and to guarantee the water quality of the produced water by applying nano-filters with significantly smaller permeate molecular weight than humic acid. As the pressure applied to the nanofilter is less than 40% of reverse osmosis, a high pressure pump is unnecessary, and as a result, the energy consumption for driving the high pressure pump is reduced by 60% or more, thereby greatly reducing the production cost. Or by uniting hollow fiber osmosis membrane module with nano filter and minimum pipe connection There are design and operation of a number of devices may become easier.

1 is a flow diagram showing the configuration of the forward osmosis desalination apparatus using an osmosis membrane and a nanofilter according to the present invention.
Figure 2 is a perspective view showing the configuration of the osmosis membrane module of the forward osmosis desalination apparatus 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 the forward osmosis desalination method using an osmosis membrane and a nano-filter according to the present invention.

Hereinafter, the configuration of the forward osmosis desalination apparatus using the osmotic membrane and the nanofilter according to the present invention will be described in detail with reference to the accompanying drawings.

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.

1 is a schematic diagram showing the configuration of the forward osmosis desalination apparatus using an osmosis membrane and a nanofilter according to the present invention, Figure 2 is a configuration of the osmosis membrane module of the forward osmosis desalination apparatus using an osmosis membrane and a nanofilter according to the present invention. 3 is an exploded perspective view of FIG. 2, and FIG. 4 is a side cross-sectional view of FIG. 2.

1 to 4, the forward osmosis desalination apparatus 100 using the osmotic membrane and the nanofilter according to the present invention includes an osmosis membrane module 110, a solution discharge pipe 120, and a nanofilter 130. And a pressurized pump 140, a concentrated solution recovery pipe 150, a brine inflow pipe 160, and a concentrated water discharge pipe 170.

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 the fresh water is separated from the brine inlet 111a and the brine into which the brine such as seawater, brackish water, and sewage treatment effluent is introduced at the upper side. Concentrated water outlet 111b for discharging concentrated concentrated water is formed at the lower side. 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 so as to provide an even pressure and flow rate to the osmosis membrane 115 in an empty hemispherical shape, and the brine and flow direction flowing in the pressure case 111 On the contrary, a solution inlet 113a and a solution outlet 113b are formed at each end so that the concentrated draw solution is introduced to discharge the drawn solution by mixing fresh water. It is coupled to the upper and lower ends. 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 reason why the flow of the induction solution and the brine is reversed is to maintain the osmotic pressure difference between the induction solution and the brine in the entire pressure case 111 so that the fresh water in the brine is continuously introduced into the osmosis membrane 115 by the osmotic pressure. For the induction solution, a high solubility and low viscosity in water and a humic acid aqueous solution which is present in a stable state in nature, the concentration of the humic acid aqueous solution is the concentration showing an osmotic pressure equal to the osmotic pressure of the incoming brine To the saturation solubility of the concentration.

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 130 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 130.

The solution discharge pipe 120 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 120 is preferably connected in parallel with the solution outlet port (113b) of each osmosis membrane module (110).

In addition, the nano filter 130 is connected to the solution discharge pipe 120 and its inlet 131 is installed, recovering fresh water from the diluted induction solution, discharged through the fresh water outlet 133, the concentrated induction solution Discharge through the outlet (135). Here, the nano filter 130 uses a specification that the molecular weight is smaller than the molecular weight of the humic acid used as the induction solution.

In addition, the pressure pump 140 is installed at the front end of the inlet 131 of the nano-filter 130 on the solution discharge pipe 120 to pressurize the diluted induction solution to supply to the nano-filter 130.

Meanwhile, the concentrated solution recovery pipe 150 connects the outlet 135 of the nanofilter 130 and the solution inlet 113a formed at the pressure cover 113 of the osmosis membrane module 110. Here, the concentrated solution recovery pipe 150 is preferably connected in parallel with the solution inlet (113a) of each osmosis membrane module (110).

And, the brine inlet pipe 160 is connected to the brine inlet 111a of the osmosis membrane module 110 to supply the brine. Here, the saltwater inlet pipe 160 is preferably connected in parallel with the brine inlet 111a of each osmosis membrane module 110. In addition, the brine may be introduced into the brine inlet 111a of the osmosis membrane module 110 through the brine inlet pipe 160 in a natural flow manner, it may be pressurized by installing a separate pressure pump (not shown).

In addition, the concentrated water discharge pipe 170 is connected to the concentrated water outlet 111b of the osmosis membrane module 110 to discharge the concentrated water. Here, the concentrated water discharge pipe 170 is preferably connected in parallel with the concentrated water outlet 111b of each osmosis membrane module (110).

On the other hand, the forward osmosis desalination apparatus 100 using the osmosis membrane and the nano-filter according to the present invention is installed an electrical conductivity meter 180 on the concentrated solution recovery pipe 150, the fresh water outlet 133 of the nano-filter 130 The controller 200 automatically generates an abnormality when the flow meter 190 is installed at the rear end of the c) and the electrical conductivity of the electrical conductivity meter 180 increases by 10% from the reference value or the flow rate of the flow meter 190 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, a method of forward osmosis desalination using an osmosis membrane and a 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 the forward osmosis desalination method using an osmosis membrane and a nano-filter according to the present invention.

Referring to FIG. 5, the brine is withdrawn from the brine inlet pipe 160 and flows into the brine inlet 111a of the osmosis membrane module 110.

Then, the introduced brine is formed in the pressure case 111 of the osmosis membrane module 110 and is discharged to the outside through the brine outlet 111b and the brine discharge pipe 170 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 150 and flows in the opposite direction to the brine inside the osmosis membrane 115 to generate osmotic pressure. Osmotic pressure separates fresh water in brine.

In addition, the induction solution diluted with fresh water is introduced into the inlet 131 of the nanofilter 130 through the solution outlet 113b of the osmosis membrane module 110 and the solution discharge pipe 120. At this time, the induction solution diluted by the pressure pump 140 is pressurized and supplied to the nano-filter 120.

Then, the fresh water is recovered from the induction solution diluted in the nano-filter 130, discharged through the fresh water outlet 133, and discharged the concentrated induction solution through the outlet 135, 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 150.

Thus, the induction solution is continuously circulated and fresh water is continuously produced in the nanofilter 130 by continuously supplying the brine.

On the other hand, the controller 200 monitors the electrical conductivity meter 180 and the flow meter 190, the electrical conductivity of the electrical conductivity meter 180 is increased by 10% than the reference value or the flow rate of the flow meter 190 is 10 than the flow reference value Automatically notify of abnormality when% decreases. In this case, when the flow rate of the flow meter 190 decreases by 10% from the flow rate reference value, the nanofilter 130 is cleaned or replaced, and when the electrical conductivity increases 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: solution discharge pipe
130: nano filter 140: pressure pump
150: concentrated solution recovery pipe 160: salt water inlet pipe
170: concentrated water discharge pipe 180: electrical conductivity meter
190: flow meter 200: controller

Claims (9)

The brine inlet to which brine is introduced, the brine outlet to which the concentrated brine is discharged, and the humic acid aqueous solution are used, and the concentration of the humic acid solution is saturated with the osmotic pressure which is the same as the osmotic pressure of the brine. An osmotic membrane module having a solution inlet through which the induction solution determined in the range up to solubility 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 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 pressurizing pump installed at the front end of the inlet of the nanofilter and pressurizing the diluted induction solution to supply the nanofilter;
A concentrated solution recovery pipe connecting the outlet of the nanofilter and the solution inlet of the osmosis membrane module;
A brine inlet pipe connected to the brine inlet of the osmosis membrane module to supply brine; And
An osmosis membrane desalination apparatus using an osmosis membrane and a nano-filter, characterized in that it comprises a concentrated water discharge pipe connected to the concentrated water outlet of the osmosis membrane module to discharge the concentrated water. The method of claim 1,
The osmosis membrane module,
A pressure case having the brine inlet and the concentrated water outlet formed at upper and lower sides thereof;
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 are fixed in parallel to the disk-shaped fixing member made of an osmotic membrane which is installed in its longitudinal direction in the pressure case using an osmotic membrane and a nano-filter Forward osmosis desalination device. The method of claim 2,
The osmosis membrane module,
The brine introduced into the pressure case through the brine inlet pipe and the brine inlet is in contact with the outside of the osmosis membrane and the osmosis membrane is formed by the difference in osmotic pressure from the concentrated induction solution flowing through the inside of the osmosis membrane. The dilute draw solution flowing through the osmotic membrane is discharged while the mixed solution flows through the dilute draw solution, and the fresh water is recovered and the concentrated brine is continuously discharged through the concentrate discharge port and the concentrate discharge pipe. After discharged through the outlet to the fresh water in the induction solution mixed with the fresh water by the nano filter through the solution discharge pipe and discharged through the fresh water outlet as the production water, the outlet of the nano filter When the concentrated solution is discharged through the concentrated solution recovery pipe Forward osmosis desalination apparatus using the osmotic membrane and the nano-filter, comprising a step of circulating the solution through the inlet. delete The method of claim 1,
The nano filter,
Osmosis membrane and forward osmosis desalination apparatus using an osmosis membrane and a nano-filter, characterized in that the specifications of the permeation molecular weight is smaller than the molecular weight of the humic acid used as the induction solution. The method of claim 1,
The osmosis membrane module,
A plurality of parallel units are installed and configured as one unit, and the number of osmosis membrane modules is determined by dividing the permeate flow rate of the nanofilter at the same pressure by the fresh water recovery flow rate of the osmosis membrane module. The osmosis membrane desalination apparatus using an osmosis membrane and a nanofilter, characterized in that the number of osmosis membrane modules is determined within a range in which the freshwater recovery flow rate does not exceed the permeation amount of the nanofilter. The method of claim 1,
The forward osmosis desalination apparatus using the osmosis membrane and the nano-filter,
An electric conductivity meter is installed on the concentrated solution recovery 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 is increased by 10% from the reference value or the flow rate of the flow meter is 10 than the flow rate reference value. Forward osmosis desalination apparatus using an osmosis membrane and a 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 osmotic desalination apparatus using the osmosis membrane and nano-filter of claim 1,
A brine supplying process of supplying and discharging the brine with natural flow or pressurization to supply a discharge to the outside of the osmosis membrane of the osmosis membrane module;
An osmosis process of supplying the concentrated induction solution into the osmosis membrane of the osmosis membrane module so as to have a flow in a direction opposite to that of the brine to separate 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 Forward osmosis desalination method using. The method of claim 8,
The forward osmosis desalination method using the osmosis membrane and the nano-filter,
When the conductivity measured from the conductivity meter installed on the concentrated solution return pipe increases 10% above the reference value or the flow rate measured from the flow meter 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. The forward osmosis desalination method using an osmosis membrane and a nanofilter, characterized in that it further comprises a monitoring step of notifying.

Images