KR102098009B1 - Reverse osmosis membrane water treatment system utilizing concentrated water - Google Patents

Abstract

A reverse osmosis membrane treatment tank for treating raw water using a reverse osmosis membrane; A raw water supply tank for supplying raw water to the reverse osmosis membrane treatment tank; A high pressure pump formed on a connection line connecting the raw water supply tank and the reverse osmosis membrane treatment tank to supply the pressure required by the reverse osmosis membrane treatment tank to raw water; the raw water passing through the reverse osmosis membrane treatment tank is divided into treated water and concentrated water , Advanced oxidation treatment tank for advanced oxidation treatment to recycle the concentrated water; And the connection line and the advanced oxidation treatment so that the concentrated water that has passed through the advanced oxidation treatment tank is combined with freshly supplied raw water from the raw water supply tank to move to the reverse osmosis membrane treatment tank so that the pressure of the concentrated water can be utilized in the high pressure pump. It provides a reverse osmosis membrane purification system for recycling the concentrated water, characterized in that it comprises a circulation line connecting the tank.

Description

REVERSE OSMOSIS MEMBRANE WATER TREATMENT SYSTEM UTILIZING CONCENTRATED WATER}

The present invention relates to a system for purifying raw water using a reverse osmosis membrane.

1 is a view showing a conventional reverse osmosis membrane water treatment system. As shown in Fig. 1, when the raw water passes through the reverse osmosis membrane, it is generally divided into treated water and concentrated water, and the concentrated water is generally discarded.

A water purification system using a reverse osmosis (RO) membrane uses a semipermeable membrane that does not allow water to pass through, but does not pass solutes (salts, etc.). When a pressure higher than that of the tea (Osmotic Pressure) is applied to the opposite aqueous solution, the water in the aqueous solution moves to pure water to be purified.

The RO membrane has a recovery rate. The ratio that passes through the semipermeable membrane and passes into the treated water. Conversely, the rate at which a specific solute is blocked by the membrane and goes out to the concentrated water is called the rejection rate. For example, if the recovery rate is 50%, 50% is the rate of generation of concentrated water. That is, when 50% of the raw water is recovered, 50% is discharged as concentrated water, and the reverse osmosis membrane has a problem that the recovery rate is not high. In addition, since a high pressure must be supplied using a high pressure pump, the energy consumption rate is also very high.

 Thus, the inventor of the present invention has been studied for a long time to solve the problem of the conventional reverse osmosis membrane water purification system, and has undergone trial and error to complete the present invention.

The present invention is to provide a system for reusing the concentrated water that is discarded after passing through the reverse osmosis membrane for reverse osmosis membrane purification.

In addition, the high pressure of the recycled concentrate is to provide a system that can save energy by sharing the pressure burden of the high pressure pump.

On the other hand, other objects not specified in the present invention will be additionally considered within a range that can be easily deduced from the following detailed description and its effects.

According to an embodiment of the present invention, a reverse osmosis membrane treatment tank for treating raw water using a reverse osmosis membrane;

A raw water supply tank for supplying raw water to the reverse osmosis membrane treatment tank;

A high pressure pump formed on a connection line connecting the raw water supply tank and the reverse osmosis membrane treatment tank to supply the pressure required by the reverse osmosis membrane treatment tank to raw water;

The raw water that has passed through the reverse osmosis membrane treatment tank is divided into treated water and concentrated water, and an advanced oxidation treatment tank for advanced oxidation treatment to recycle the concentrated water; And

The connection line and the advanced oxidation treatment tank so that the concentrated water that has passed through the advanced oxidation treatment tank is combined with freshly supplied raw water from the raw water supply tank to move to the reverse osmosis membrane treatment tank so that the pressure of the concentrated water can be utilized in the high pressure pump. Characterized in that it comprises a circulation line connecting the,

Provided is a reverse osmosis membrane water purification system for recycling concentrated water.

In addition, the present invention is installed in the circulation line, the first sensing unit for measuring the pressure of the concentrated water passing through the advanced oxidation treatment tank; And

A first control unit connected between the high pressure pump and the first sensing unit to control the pressure of the high pressure pump in consideration of the pressure measured by the first sensing unit may be further included.

The advanced oxidation treatment tank,

It includes a hydrogen peroxide supply unit for supplying hydrogen peroxide, an ozone supply unit for supplying ozone, and an ultraviolet treatment unit for supplying ultraviolet light for the high-oxidation destination of the concentrated water,

The ozone supply unit or the hydrogen peroxide supply unit is selectively operated so that the ozone or the hydrogen peroxide may be selectively supplied to the ultraviolet treatment unit.

In addition, the present invention is installed in the circulation line, the second sensing unit for measuring the concentration of a predetermined pollutant concentration of the concentrated water passing through the advanced oxidation treatment tank;

A discharge line connected to the circulation line and discharging the concentrated water to the outside when a concentration of a predetermined pollutant measured by the second sensing unit is greater than or equal to a preset concentration;

A valve formed between the circulation line and the discharge line to control the path of the concentrated water; And

A second control unit that is formed between the second sensing unit and the valve and controls the valve according to a concentration of a predetermined pollutant measured by the second sensing unit may be further included.

In addition, when recycling the concentrated water, the amount of fresh water supplied from the raw water supply tank may be the same as the amount recovered from the reverse osmosis membrane treatment tank.

If the reverse osmosis membrane water purification system for recycling the concentrated water according to the present invention is used, it is possible to increase the efficiency of water purification of the reverse osmosis membrane by reusing the previously discarded concentrated water.

In addition, by reusing the high-pressure concentrated water, it is possible to greatly reduce the energy burden of the high-pressure pump, which is very helpful in saving energy.

On the other hand, even if the effects are not explicitly mentioned herein, it is noted that the effects described in the following specification expected by the technical features of the present invention and the potential effects thereof are handled as described in the specification of the present invention.

1 is a view showing a conventional reverse osmosis membrane water treatment system.
2 is a view of a reverse osmosis membrane water purification system for recycling concentrated water according to an embodiment of the present invention.
3 is a view of a reverse osmosis membrane water purification system for recycling concentrated water according to another embodiment of the present invention.
The accompanying drawings indicate that they are exemplified by reference for understanding of the technical idea of the present invention, and the scope of the present invention is not limited thereby.

In the description of the present invention, when it is determined that the subject matter of the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

The terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "include" or "have" are intended to indicate the presence of features, numbers, steps, actions, components, parts or combinations thereof described herein, one or more other features. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance.

2 is a diagram of a reverse osmosis membrane water purification system for recycling concentrated water according to an embodiment of the present invention, and FIG. 3 is a diagram of a reverse osmosis membrane water purification system for recycling concentrated water according to another embodiment of the present invention. Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 2 and 3.

The reverse osmosis membrane water purification system for recycling concentrated water according to the present invention includes a raw water supply tank 200, a reverse osmosis membrane processing tank 100, a high pressure pump 300, an advanced oxidation treatment tank 400, and a circulation line L2. .

The raw water supply tank 200 serves to store raw water to be purified and then supply it to the reverse osmosis membrane processing tank 100. At this time, the raw water supply tank 200 may be a tank for storing raw water, or may function as an intermediate connection for transferring raw water from the outside to the reverse osmosis membrane treatment tank 100.

The reverse osmosis membrane treatment tank 100 processes raw water received from the raw water supply tank 200 using a reverse osmosis membrane. Depending on the recovery rate of the reverse osmosis membrane, the ratio of treated water and concentrated water is determined, and the recovery rate of most reverse osmosis membranes is only 50%. That is, 50% of the raw water is recovered and used as treated water, but the remaining 50% can be discarded as concentrated water.

In the present invention, such concentrated water is reused.

Meanwhile, a high pressure higher than the osmotic pressure is required for the reverse osmosis membrane treatment, and the high pressure pump 300 supplies the high pressure required for the reverse osmosis membrane treatment to raw water. For example, 60 bar may be required for reverse osmosis membrane treatment, and this high pressure is provided by the high pressure pump 300.

The advanced oxidation treatment tank 400 oxidizes the concentrated water that has passed through the reverse osmosis membrane treatment tank 100 to oxidize various organic or inorganic substances in the concentrated water. Since the reaction rate of the advanced oxidation treatment tank 400 is very fast, the concentrated water rapidly passes through the advanced oxidation treatment tank 400 and is re-injected into the reverse osmosis membrane treatment tank 100 while maintaining high pressure after water treatment.

The advanced oxidation treatment tank 400 may be subjected to advanced oxidation treatment by selectively introducing hydrogen peroxide or ozone based on the ultraviolet treatment unit 410.

When the concentrated water discharged at high pressure through the reverse osmosis membrane treatment tank 100 undergoes an advanced oxidation treatment process based on ultraviolet rays, it can proceed without loss of pressure and flow rate.

It is possible to significantly reduce the energy consumption rate of the high pressure pump 300 by transferring the pressure of the concentrated water to the high pressure pump 300 as it is.

The circulation line (L2) is combined with the fresh water supplied from the raw water supply tank (200) and the concentrated water that has passed through the advanced oxidation treatment tank (400) to be moved back to the reverse osmosis membrane treatment tank (100) and the advanced connection line (L1). It is disposed between the oxidation treatment tank 400. Among the connection lines (L1), it is preferable that the front end of the high pressure pump (300) and the circulation line (L2) are connected.

By connecting the circulation line (L2) to the connection line (L1) at the front end of the high pressure pump (300), the high pressure of the concentrated water is transmitted to the high pressure pump (300), so that the high pressure pump (300) can be reverse osmosis membrane treatment tank (100) with only a small supply of pressure ).

Hereinafter, 60 bar is required for the reverse osmosis membrane treatment, and the recovery rate of the reverse osmosis membrane is assumed to be 50%, and an embodiment according to the present invention will be described.

When the recovery rate of the reverse osmosis membrane is 50%, when high-pressure raw water is injected into the reverse osmosis membrane treatment tank 100, 50% of the injected raw water is treated as treated water, and the remaining 50% is discharged as concentrated water. And concentrated water will be distributed. For example, if a pressure of 60 bar is provided from the high pressure pump 300, some of the pressure of 60 bar may be distributed to the treated water and the rest to concentrated water. In general, the pressure of the treated water is very low, while the pressure of the concentrated water is measured very high. For example, the pressure of the treated water may be 2 bar, and the pressure of the concentrated water may be 58 bar.

Therefore, the concentrated water having such a high pressure is recycled by recycling it to the reverse osmosis membrane treatment tank 100 requiring high pressure. When the high pressure concentrated water is recirculated, the high pressure of the concentrated water is also reused, and as a result, the load on the high pressure to be provided by the high pressure pump 300 is greatly reduced, thereby saving energy.

For example, if the pressure of the high-pressure concentrated water is 58 bar and high pressure, and the pressure required by the reverse osmosis membrane treatment tank 100 is 60 bar, the high pressure pump 300 supplies only a very small amount of pressure, and the reverse osmosis membrane treatment tank ( It is possible to meet the pressure required in 100).

At this time, the inflow into the reverse osmosis membrane treatment tank 100 is the sum of the fresh water supplied from the raw water supply tank 200 and the concentrated water that has passed through the advanced oxidation treatment tank 400. At this time, the ratio of the flow rate of the raw water and the concentrated water may be 1: 1. That is, when the concentrated water that has passed through the advanced oxidation treatment tank 400 is 25 ml, the newly introduced raw water may also be 25 ml.

If the amount of raw water is too large compared to the concentrated water, the high pressure pump 300 must supply a high pressure again by the raw water having a low pressure of the concentrated water.

Conversely, if the amount of raw water is too small relative to the concentrated water, the raw water treatment efficiency is too low. Raw water must be continuously purified as it is continuously supplied, because if the amount of freshly supplied raw water decreases, the amount of raw water processed also decreases.

On the other hand, assuming that the recovery rate of the reverse osmosis membrane is 70%, at this time, 30% of the input raw water becomes concentrated water, and thus, 30% of the concentrated water and the newly added raw water are 70% combined to be introduced into the reverse osmosis membrane treatment tank 100. Will be.

Eventually, the ratio of the flow rate of the freshly added raw water and the reused concentrated water may vary depending on the recovery rate, and the amount of freshly added raw water may be determined by the amount of treated water recovered through the advanced oxidation treatment tank 400 according to the recovery rate. have.

At this time, the high pressure of 30% of the concentrated water and the high pressure contained in the concentrated water share the high pressure that the high pressure pump 300 needs to supply, thereby minimizing the energy consumption of the high pressure pump 300.

As illustrated in FIG. 2, the present invention may further include a first sensing unit 500 and a first control unit 600.

The first sensing unit 500 is installed in the circulation line (L2) to measure the pressure of the concentrated water passing through the advanced oxidation treatment tank (400).

The first control unit 600 is connected between the high pressure pump 300 and the first sensing unit 500 to control the pressure of the high pressure pump 300 in consideration of the pressure measured by the first sensing unit 500.

The first sensing unit 500 measures the pressure of the concentrated water and delivers it to the control unit. The control unit may calculate the flow rate of the concentrated water and the flow rate of the fresh water input from the raw water supply tank 200 through the preset flow rate and recovery rate of the reverse osmosis membrane treatment tank 100.

Through the calculated flow rate of the concentrated water, the flow rate of the raw water, and the pressure of the concentrated water measured by the first sensing unit 500, the pressure to be additionally provided by the high pressure pump 300 is calculated. At this time, the pressure is naturally lower than the pressure of the high pressure to be provided in the first process.

As described above, the flow rate of the concentrated water and the flow rate of the raw water to be newly added are determined according to the recovery rate of the reverse osmosis membrane treatment tank 100, so the flow rate of the concentrated water is determined by the flow rate and recovery rate of the reverse osmosis membrane treatment tank 100. It can be calculated automatically without measurement.

3 shows a reverse osmosis membrane water purification system for recycling concentrated water according to another embodiment of the present invention.

Referring to FIG. 3, the present invention further includes a second sensing unit 700, a discharge line L3, a valve 800, and a second control unit.

The second sensing unit 700 is installed in the circulation line (L2) to measure the concentration of certain pollutants in the concentrated water that has passed through the advanced oxidation treatment tank (400).

The discharge line L3 is connected to the circulation line L2, and when the concentration of the predetermined pollutant measured by the second sensing unit 700 is greater than or equal to the predetermined concentration, the concentrated water can be discharged to the outside without recycling.

The valve 800 is formed between the circulation line L2 and the discharge line L3 to control the path of the concentrated water.

In addition, the second control unit is formed between the second sensing unit 700 and the valve 800 to control the valve 800 according to the concentration of a predetermined pollutant measured by the second sensing unit 700.

The first control unit 600 that controls the high-pressure pump according to the pressure of the concentrated water measured by the first sensing unit 500 may perform the function of the second control unit. That is, when the concentration of the predetermined pollutant is considered to be greater than or equal to a certain level by considering the pressure of the concentrated water measured by the first sensing unit 500 and the concentration of the preset pollutant measured by the second sensing unit 700 The first controller may adjust the circulating line to be connected to the discharge line while resetting the high pressure pump 300 to the initial state. At this time, the first control unit 600 is connected to both the first sensing unit 500 and the second sensing unit to receive information from each sensing unit to control the valve and the high pressure pump.

In FIG. 3, although the first control unit 600 and the second control unit are shown in the same manner, the control unit may separately control the valve and the high pressure pump as described above.

For example, the second sensing unit 700 may measure the concentration of Total Dissolved Solids (TDS). The concentrated water is recycled only when the concentration of the TDS measured by the second sensing unit 700 is less than a predetermined concentration. If the concentration of the TDS is measured to a certain level or more, it means that the treatment efficiency of the advanced oxidation treatment tank 400 has dropped rapidly, and in this case, it is preferable to discharge the concentrated water to the outside.

In this case, the flow rate of the raw water supplied to the reverse osmosis membrane treatment tank 100 is the same as the flow rate of the raw water initially supplied, and provides the high pressure pump 300 or the pressure provided initially. That is, the concentrated high-pressure concentrated water is recycled only when the concentration of the specific pollutant measured in the concentrated water is below a certain level, and when the concentration is higher than a certain level, the concentrated water is discharged to the outside without recycling.

At this time, the second control unit receives the information measured by the second sensing unit 700 and adjusts the valve 800 so that the concentrated water moves to the connection line L1 through the circulation line L2 when the concentration is less than a predetermined concentration. If the concentration is higher than the set concentration, the valve 800 is adjusted so that the concentrated water moves to the discharge line L3 through the circulation line L2.

That is, when the concentration of the specific substance measured by the second sensing unit 700 exceeds a certain standard, it is determined that the treatment efficiency of the advanced oxidation treatment tank 400 for the specific substance is significantly reduced, and the concentrated water at this time is not recycled. Without exhausting all. In this case, the reverse osmosis membrane treatment tank 100 returns to the state of the initial process, and the raw water supply tank 200 supplies the first supplied flow rate, and the high pressure pump 300 also supplies the first high pressure.

The advanced oxidation treatment tank 400 according to the present invention may include a hydrogen peroxide supply unit 430, an ozone supply unit 420, and an ultraviolet treatment unit 410. In this case, the ozone supply unit or the hydrogen peroxide supply unit 430 is selectively operated to selectively supply ozone or hydrogen peroxide to the ultraviolet ray processing unit 410.

At this time, a third sensing unit 440 for measuring the type and amount of contaminants in the concentrated water may be further included. And a third control unit (not shown) to selectively control the hydrogen peroxide supply of the hydrogen peroxide supply unit 430 or the ozone supply of the ozone supply unit 420 to selectively operate either the hydrogen peroxide supply unit 430 or the ozone supply unit 420 It may further include. The third control unit determines a combination of ultraviolet rays and hydrogen peroxide or a combination of ultraviolet rays and ozone according to the optimum combination of the high-level oxidation treatment corresponding to the specific pollutant and the amount thereof, and accordingly, the hydrogen peroxide supply unit 430 or the ozone supply unit The 420 can be selectively operated.

The scope of protection of the present invention is not limited to the description and expression of the embodiments explicitly described above. In addition, it is pointed out again that the protection scope of the present invention may not be limited by obvious changes or substitutions in the technical field to which the present invention pertains.

100: reverse osmosis membrane treatment tank
200: raw water supply tank
300: high pressure pump
400: advanced oxidation treatment tank
410: UV treatment unit
420: ozone supply unit
430: hydrogen peroxide supply unit
440: third sensing unit
500: first sensing unit
600: first control unit
700: second sensing unit
800: valve
L1: Connection line
L2: circulation line
L3: discharge line

Claims (5)

A reverse osmosis membrane treatment tank for treating raw water using a reverse osmosis membrane;
A raw water supply tank for supplying raw water to the reverse osmosis membrane treatment tank;
A high pressure pump formed on a connection line connecting the raw water supply tank and the reverse osmosis membrane treatment tank to supply the pressure required by the reverse osmosis membrane treatment tank to raw water;
The raw water that has passed through the reverse osmosis membrane treatment tank is divided into treated water and concentrated water, and an advanced oxidation treatment tank for advanced oxidation treatment to recycle the concentrated water; And
The connection line and the advanced oxidation treatment tank so that the concentrated water that has passed through the advanced oxidation treatment tank is combined with freshly supplied raw water from the raw water supply tank to move to the reverse osmosis membrane treatment tank so that the pressure of the concentrated water can be utilized in the high pressure pump. It includes a circulation line connecting the,
A first sensing unit installed in the circulation line and measuring the pressure of the concentrated water that has passed through the advanced oxidation treatment tank; And
Further comprising a first control unit connected between the high-pressure pump and the first sensing unit to control the pressure of the high-pressure pump in consideration of the pressure measured by the first sensing unit,
A second sensing unit installed in the circulation line and measuring a concentration of a predetermined pollutant in the concentrated water that has passed through the advanced oxidation treatment tank;
A discharge line connected to the circulation line and discharging the concentrated water to the outside when a concentration of a predetermined pollutant measured by the second sensing unit is greater than or equal to a preset concentration;
A valve formed between the circulation line and the discharge line to control the path of the concentrated water; And
It is formed between the second sensing unit and the valve further comprises a second control unit for controlling the valve according to the concentration of the predetermined pollutants measured by the second sensing unit,
When recycling the concentrated water, characterized in that the amount of fresh water supplied from the raw water supply tank is the same as the amount recovered from the reverse osmosis membrane treatment tank,
Reverse osmosis membrane water purification system for recycling concentrated water. delete According to claim 1,
The advanced oxidation treatment tank,
For the advanced oxidation treatment of the concentrated water includes a hydrogen peroxide supply unit for supplying hydrogen peroxide, an ozone supply unit for supplying ozone, and an ultraviolet treatment unit for supplying ultraviolet light,
The ozone supply unit or the hydrogen peroxide supply unit is selectively operated, characterized in that the ozone or the hydrogen peroxide is selectively supplied to the ultraviolet treatment unit,
Reverse osmosis membrane water purification system for recycling concentrated water.
delete delete

Images