KR101184650B1 - Forward osmotic desalination device for using osmotic membrane submerged in osmosis driving solution and nanofilter and the method thereof - Google Patents

Abstract

The present invention relates to an osmotic induction solution storage tank immersion type forward osmosis desalination apparatus and method of an osmosis membrane using an osmosis membrane and a nano-filter. An osmosis membrane module having a concentrated water outlet through which fresh water is separated by brine; A storage tank provided with a solution inlet port and a solution outlet port to circulate the induction solution, and storing a certain amount of the induction solution therein, wherein the osmosis membrane module is immersed below the level of the induction solution; A solution discharge pipe connected to the solution discharge port of the storage tank; 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 storage tank; 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

FORWARD OSMOTIC DESALINATION DEVICE FOR USING OSMOTIC MEMBRANE SUBMERGED IN OSMOSIS DRIVING SOLUTION AND NANOFILTER AND THE METHOD THEREOF}

The present invention relates to an osmotic induction solution storage tank immersion type forward osmosis desalination apparatus and method of the osmosis membrane, and more specifically, to recover fresh water from salt water, such as seawater, brackish water, sewage treatment effluent, the influent brine is an osmosis membrane The freshwater in the brine passes through the osmosis membrane due to the osmotic pressure difference with the induction solution with the osmotic pressure higher than the inflow brine opposite to the boundary.The fresh water and the diluted induction solution passed through the membrane by osmotic pressure are transported to the nanofilter and recovered again. The present invention relates to an osmotic membrane and an osmotic induction solution storage tank immersion type forward osmosis desalination apparatus and method for producing osmosis membranes and nanofiltration membranes, which are continuously circulated and produce production water passing through the nanofilters.

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. 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, 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. Is there is provided an osmotic membrane permeation induced solution 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 solution inlet and outlet through which the induction solution is introduced and discharged, a brine inlet through which brine is supplied, and a brine outlet through which the fresh water separated by the osmosis membrane is discharged; A storage tank provided with a solution inlet port and a solution outlet port to circulate the induction solution, and storing a certain amount of the induction solution therein, wherein the osmosis membrane module is immersed below the induction solution level; A solution discharge pipe connected to the solution discharge port of the storage tank; 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 storage tank; 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 is formed in a hollow shape, the pressure case and the plurality of solution inlet and outlet is formed; A pressure cover having an inner hemispherical shape and having a brine inlet and a concentrated water outlet at each end thereof 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.

In addition, the osmosis membrane module is the induction solution stored in the storage tank is introduced into the pressure case through a plurality of the solution inlet and outlet to be in contact with the outside of the osmosis membrane, the osmotic pressure with the brine flowing through the inside of the osmosis membrane The fresh water separated by the difference is mixed with the induction solution of the storage tank through the osmosis membrane to be discharged through the solution inlet and outlet, and the concentrated water separated from the fresh water is discharged to the outside through the concentrated water outlet and the concentrated water discharge pipe. Let's do it.

Here, the storage tank is a fresh water in the induction solution mixed with fresh water by the nano-filter by injecting the diluted induction solution diluted with fresh water to the nano-filter through the solution outlet and the solution discharge pipe. The fresh water is discharged through the outlet, and the concentrated induction solution is continuously circulated by flowing through the outlet of the nanofilter, the concentrated solution recovery pipe, and 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 osmotic induction solution storage tank immersion forward osmosis desalination apparatus of the osmosis membrane using the osmosis membrane and the nano-filter is provided with an electrical conductivity meter on the concentrated solution recovery pipe, the flow meter is installed at the rear end of the fresh water outlet of the nano-filter And 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 flow meter decreases by 10% from the flow reference value.

According to another aspect of the present invention,

In the forward osmosis desalination method using the osmotic induction solution storage tank immersion type forward osmosis desalination apparatus of the osmosis membrane using the osmosis membrane and the nano-filter, injecting the osmosis membrane module into the storage tank in which the induction solution is stored to contact the induction solution with the outside of the osmosis membrane. A solution contact process; A forward osmosis process of supplying brine to have a flow in one direction inside the osmosis membrane of the osmosis membrane module to separate the fresh water from the brine by osmotic pressure and to discharge it into the storage tank; A dilution solution discharge process of discharging the induction solution diluted with fresh water in the storage tank to the nanofilter; And a production water separation process of separating the induction solution diluted in the nanofilter to each other to discharge freshwater production water to the outside, and circulating and supplying the concentrated induction solution to the storage tank.

Here, the osmotic induction solution storage tank 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% or more than the reference value of the nanofilter The method further includes a monitoring process that automatically notifies the occurrence of abnormality when the flow rate measured from the flow meter installed at the rear end of the fresh water discharge port decreases by 10% from the flow rate reference value.

According to the osmotic induction solution storage tank immersion type forward osmosis desalination apparatus and method of the osmotic membrane using the osmosis membrane and the nano-filter of the present invention configured as described above, the solubility of the humic acid in water is greater as the osmotic induction solution is used as an aqueous humic acid solution. Due to the low viscosity, high osmotic pressure can be induced, and the decrease of freshwater production flow due to concentration polarization can be minimized to ensure continuous freshwater production. Water quality can be guaranteed, and the pressure applied to the nanofilter is less than 40% compared to reverse osmosis, which eliminates the need for a high pressure pump, thereby significantly reducing production costs as energy consumption for driving the high pressure pump is reduced by more than 60%. It is possible to use a plurality of tubular or hollow fiber osmosis membrane modules with nano filters and With the small pipe connection, the unit (UNIT) can simplify the design and operation of the desalination system.

Figure 1 is a schematic diagram showing the configuration of the osmotic induction solution reservoir 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 perspective view showing the configuration of the osmosis membrane module of the osmotic induction solution storage tank immersion type 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 the osmotic induction solution 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, the configuration of the osmotic induction solution storage tank immersion type forward osmosis desalination apparatus 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.

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 osmotic induction solution storage 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 an osmotic induction 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 a solution storage tank immersion type forward 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 osmotic induction solution storage tank immersion type 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, The solution discharge pipe 130, the nano filter 140, the pressure pump 150, the concentrated solution recovery pipe 160, the brine inflow pipe 170, and the concentrated water discharge pipe 180 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 a plurality of solution inlets and outlets 111a through which a draw solution flows are formed on a side surface thereof. 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 into the pressure case 111 seawater, brackish water ), A brine inlet (113a) and a brine inlet to separate the fresh water from the brine so as to introduce the brine such as sewage treatment effluent and the concentrated water outlet (113b) is formed at each end to discharge the concentrated water in the pressure case ( 111) 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 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 a solution inlet 121 and a solution outlet 123 so that the induction solution is introduced and discharged, and a certain amount of the induction solution is stored therein, and the osmosis membrane module is immersed below the induction solution level. . Here, the storage tank 120 is provided with a stirrer 125 so that the concentration of the induction solution is uniform.

In addition, the solution discharge pipe 130 is connected to the solution outlet 123 of the storage tank 120.

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 121 formed in the storage tank 120.

And, the brine inflow pipe 170 is connected to the brine inlet (113a) of the osmosis membrane module 110 to supply the brine. Here, the saltwater inlet pipe 170 is preferably connected in parallel with the brine inlet (113a) of each osmosis membrane module (110). In addition, the brine may be introduced into the brine inlet (113a) of the osmosis membrane module 110 through the brine inlet pipe 170 in a natural flow manner, it may be pressurized by installing a separate pressure pump (not shown).

In addition, the concentrated water discharge pipe 180 is connected to the concentrated water outlet 113b of the osmosis membrane module 110 to discharge the concentrated water. Here, the concentrated water discharge pipe 180 is preferably connected in parallel with the concentrated water outlet (113b) of each osmosis membrane module (110).

On the other hand, the osmotic induction solution storage tank immersion type forward osmosis desalination apparatus 100 of the osmosis membrane using the osmosis membrane and the nano-filter according to the present invention, the electrical conductivity meter 190 is installed on the concentrated solution recovery pipe 160, the nano-filter ( When the flowmeter 200 is installed at the rear end of the fresh water discharge port 143 of the 140, the electrical conductivity of the electrical conductivity meter 190 is increased by 10% from the reference value or when the flow rate of the flowmeter 200 is reduced by 10% from the normal flow reference value. The controller 210 automatically notifies the occurrence. In this case, various methods such as an alarm, a warning light, and an SMS may be applied.

Hereinafter, an osmotic induction solution storage tank immersion type forward osmosis desalination method of an osmosis membrane 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 osmotic induction solution 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, the brine is withdrawn from the brine inflow pipe 170 and flows into the brine inlet 113a of the osmosis membrane module 110.

Then, the introduced brine is formed in the pressure case 111 of the osmosis membrane module 110, the fresh water is separated and concentrated by osmotic pressure with the induction solution, and then concentrated water outlet 113b of the osmosis membrane module 110. And discharged to the outside through the concentrated water discharge pipe 180.

At the same time, the induction solution is freely introduced into the pressure case 111 through the solution inlet and outlet 111a of the osmosis membrane module 110 to generate the brine and osmotic pressure flowing in one direction in the osmosis membrane module 110. The fresh water in the brine is separated by osmotic pressure.

Then, the induction solution is discharged to the storage tank 120 again through the solution inlet and outlet 111a, mixed with the fresh water in the storage tank 120 and diluted. At this time, the storage tank 120 is always circulated through a constant amount of the induction solution through the solution inlet 121 and the solution outlet 123, the concentration of the induction solution is kept constant because the stirrer 125 is stirred inside.

Subsequently, the induction solution diluted with fresh water is introduced into the inlet 141 of the nanofilter 140 through the solution outlet 123 and the solution discharge pipe 130 of the storage tank 120. 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 The solution 160 is introduced into the solution inlet 121 of the storage tank 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 210 monitors the electrical conductivity meter 190 and the flow meter 200, the electrical conductivity of the electrical conductivity meter 190 is increased by 10% than the reference value or the flow rate of the flow meter 200 is 10 than the flow reference value Automatically notify of abnormality when% decreases. At this time, when the flow rate of the flow meter 200 is reduced by 10% than the flow rate reference value, the nano filter 140 is cleaned or replaced, and when the electrical conductivity is increased by 10% than the operation value to clean or replace the osmosis membrane module 110 do.

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: brine inlet pipe 180: concentrated water discharge pipe
190: electrical conductivity meter 200: flow meter
210: controller

Claims (10)

An osmosis membrane module having a solution inlet and outlet through which the induction solution is introduced and discharged, a brine inlet through which brine is supplied, and a brine outlet through which the fresh water separated by the osmosis membrane is discharged;
A storage tank provided with a solution inlet port and a solution outlet port to circulate the induction solution, and storing a certain amount of the induction solution therein, wherein the osmosis membrane module is immersed below the level of the induction solution;
A solution discharge pipe connected to the solution discharge port of the storage tank;
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 storage tank;
A brine inlet pipe connected to the brine inlet of the osmosis membrane module to supply brine; And
Osmosis induction solution storage tank immersion type forward osmosis desalination apparatus of the osmosis membrane using an osmosis membrane and a nano-filter, characterized in that consisting of 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 formed in a hollow shape and having a plurality of solution inlets and outlets formed therein;
A pressure cover having an inner hemispherical shape and having a brine inlet and a concentrated water outlet at each end thereof 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 Osmosis induction solution storage tank immersion type forward osmosis desalination apparatus of osmotic membrane. The method of claim 2,
The osmosis membrane module,
The induction solution stored in the storage tank is introduced into the pressure case through a plurality of solution inlet and outlet to be in contact with the outside of the osmosis membrane, and the fresh water separated by the osmotic pressure difference with the brine flowing through the osmosis membrane is the osmosis Through the membrane and mixed with the induction solution of the storage tank to be discharged through the solution inlet and outlet, and the osmosis membrane and nano, characterized in that the concentrated water separated from the fresh water discharged to the outside through the concentrated water outlet and the concentrated water discharge pipe Osmosis induction solution storage tank immersion type forward osmosis desalination apparatus of osmotic membrane using filter. The method of claim 2,
The storage tank,
The induction solution diluted by fresh water 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. In addition, the osmotic induction solution storage tank immersion type forward osmosis desalination of the osmosis membrane using the osmosis membrane and the nano-filter, characterized in that the concentrated induction solution is introduced through the outlet of the nano filter, the concentrated solution recovery pipe and the solution inlet for continuous circulation. Device. The method of claim 1,
The induction solution,
Osmosis using an osmotic membrane and a nanofilter, wherein a humic acid aqueous solution is used and the concentration of the humic acid aqueous solution is determined in a range from the concentration of osmotic pressure equal to the osmotic pressure of the incoming brine to the saturation solubility of the corresponding concentration. Osmosis induction solution reservoir immersion type forward osmosis desalination system of membrane. The method of claim 5, wherein
The nano filter,
An osmotic induction solution storage tank immersion type forward osmosis desalination apparatus of an osmosis membrane using an osmosis membrane and a nanofilter, characterized in that the specification 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,
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. Osmosis induction solution storage tank immersion type forward osmosis desalination apparatus of the osmosis membrane using the osmosis membrane and the nano-filter, characterized in that the number of the 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 osmotic induction solution storage tank immersion 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. Osmotic induction solution storage tank immersion type forward osmosis desalination apparatus of the osmosis membrane and osmosis membrane using the osmosis membrane and nano-filter characterized in that it further comprises a controller for automatically notifying the occurrence of abnormalities when the% decrease. In the osmotic desalination method using the osmotic induction solution storage tank immersion type forward osmosis desalination apparatus of the osmosis membrane using the osmosis membrane and nano-filter of claim 1,
A solution contact step of contacting the induction solution with the outside of the osmosis membrane by introducing an osmosis membrane module into a storage tank in which the induction solution is stored;
A forward osmosis process of supplying brine to have a flow in one direction inside the osmosis membrane of the osmosis membrane module to separate the fresh water from the brine by osmotic pressure and to discharge it into the storage tank;
A dilution solution discharge process of discharging the induction solution diluted with fresh water in the storage tank to the nanofilter; And
Separating the induction solution diluted in the nano-filter to each other to discharge the fresh water production water to the outside, and using the osmosis membrane and nano-filter characterized in that the production water separation process for circulating supply the concentrated induction solution to the storage tank Osmosis induction solution storage tank immersion type forward osmosis desalination method of osmotic membrane. The method of claim 9,
Osmosis induction solution storage tank immersion type 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. Osmosis induction solution storage tank 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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