KR102631339B1 - Concentrated water circulation supply type industrial water purification system with diluted supply structure of concentrated water - Google Patents

Abstract

The present invention relates to a high-recovery reverse osmosis (RO) membrane-type industrial water purification system with a concentrated water dilution supply structure, and more specifically, to purifying raw water by passing it through a plurality of reverse osmosis membrane cartridges. and concentrated water are separated, the concentrated water from which the purified water is separated is diluted with raw water, and circulated and supplied to a reverse osmosis membrane cartridge for reverse osmosis filtration, thereby minimizing the generation of concentrated water and improving the recovery rate of purified water. This relates to an industrial water purification system with concentrated water circulation supply having a dilution supply structure.

Description

Concentrated water circulation supply type industrial water purification system with diluted supply structure of concentrated water}

The present invention relates to a high-recovery reverse osmosis (RO) membrane-type industrial water purification system with a concentrated water dilution supply structure, and more specifically, to purifying raw water by passing it through a plurality of reverse osmosis membrane cartridges. and concentrated water are separated, the concentrated water from which the purified water is separated is diluted with raw water, and circulated and supplied to a reverse osmosis membrane cartridge for reverse osmosis filtration, thereby minimizing the generation of concentrated water and improving the recovery rate of purified water. This relates to an industrial water purification system with concentrated water circulation supply having a dilution supply structure.

While the demand for water has recently increased due to improved living standards and increased economic activities, limited water resources are expected to lead to regional imbalances in water supply and demand in the future, requiring active discovery of water resources and reuse of high-quality effluent water.

In particular, Korea belongs to a group of countries with high water stress and has a river water intake rate of 36%, making it vulnerable to water use during drought.

Therefore, there are many examples of rainwater use and reclaimed water to reduce water stress by reducing water intake from existing water sources such as rivers and to preemptively respond to droughts caused by climate change, but in the case of reuse of effluent from wastewater treatment plants, which are large-scale environmental basic facilities, a source of demand is secured. , Due to the high unit price of reused water compared to existing industrial water, high maintenance costs of the RO reuse process, and many concentrated water treatment problems, there are only a few cases where reuse facilities have been applied, except for a few areas such as Pohang and Gumi.

Meanwhile, the reverse osmosis (RO) membrane water purification system, which removes ions from raw water from which solid particles have been removed through the conventional UF treatment process and recovers them by treating them as industrial water, is a primary reverse osmosis ion treatment unit, as shown in Figure 8. The secondary reverse osmosis ion treatment unit is connected in series through the primary concentrated water discharge pipe, so that the secondary reverse osmosis ion treatment unit purifies the concentrated water with high concentrated ion concentration discharged from the primary reverse osmosis ion treatment unit. do.

The reverse osmosis membrane system is configured to recover 50% of the treated water for 100% of the total raw water supply from the primary reverse osmosis ion treatment unit, and to recover 50% of the treated water for 50% of the concentrated water separated from the raw water. In a serial relationship, 75% of the treated water is recovered for 100% of the total raw water supply through the first reverse osmosis ion treatment process and the second reverse osmosis ion treatment process, and the remaining 25% of concentrated water is produced.

Therefore, the conventional reverse osmosis membrane system in which the first reverse osmosis ion treatment unit and the second reverse osmosis ion treatment unit are connected in series has a low recovery rate of treated water because it has a recovery rate of 75% relative to the total amount of raw water, Due to the large amount of concentrated water generated, expensive post-treatment costs such as evaporation are required. Due to the instability of the two-stage serial RO process, the economic feasibility is significantly reduced due to the increase in maintenance costs, so a project to reuse the effluent from the wastewater treatment plant is underway due to the increase in the unit price of reused water. There are many problems, including the difficulty of implementing a zero-discharge and minimum-discharge process.

In particular, in the reverse osmosis membrane system, the first reverse osmosis ion treatment unit and the second reverse osmosis ion treatment unit are connected in series, so that the reverse osmosis layer of the reverse osmosis membrane of the second reverse osmosis ion treatment unit has a concentration of ions higher than the standard concentration. As the remaining concentrated ions accumulate, the ion polarization phenomenon intensifies, and as a result, the remaining concentrated ions that have formed the ion polarization phenomenon adhere to the reverse osmosis layer, forming a large amount of scale, shortening the chemical cleaning cycle and thereby shortening the lifespan of the reverse osmosis membrane. In addition, a problem occurred in which the recovery rate of treated water was reduced.

Therefore, in the conventional reverse osmosis membrane system, the lifespan of the reverse osmosis membrane does not reach the design value, causing problems such as increased maintenance costs due to frequent replacement of the reverse osmosis membrane, lowered water quality of treated water, and reduced recovery rate.

Meanwhile, the present inventor treats raw water from which solid particles have been removed through a pretreatment process with a reverse osmosis (RO) membrane, and reverse osmosis membranes are arranged in a plurality of parallel structures to filter out ions remaining in the raw water, thereby removing the ions. One or more reverse osmosis ion treatment units that separate and discharge concentrated water in which ions removed from water and raw water remain concentrated; a raw water supply unit supplying raw water from which solid particles have been removed to each of the reverse osmosis ion treatment units; and recovering the concentrated water discharged from the reverse osmosis ion treatment unit, mixing the recovered concentrated water with the raw water supplied by the raw water supply unit, and supplying the water to the reverse osmosis ion treatment unit, thereby mixing the remaining concentrated water with the raw water. We proposed a high-recovery reverse osmosis reuse system through optimization of batch and continuous operation of a parallel structure membrane, which is composed of a concentrated water circulation supply unit that re-supplies concentrated water with reduced concentration to the reverse osmosis ion treatment unit. there is.

The high-recovery reverse osmosis reuse system minimizes the amount of concentrated water generated, which requires a lot of cost for post-treatment, and minimizes the formation of scale on the surface of the reverse osmosis membrane, so it has very high stability compared to the existing two-stage RO process and reduces the cleaning cycle. As it can be used for a long time, it is possible to reduce maintenance costs by extending the life of the reverse osmosis membrane, and the recovery rate of treated water is increased, resulting in improved productivity and economic efficiency.

However, when the concentrated water recovered from the reverse osmosis ion treatment unit is diluted with raw water and re-supplied to the reverse osmosis ion treatment unit, a large amount of air remains in the concentrated water, and when the concentrated water is circulated repeatedly, the remaining amount of air is increases.

In this way, a large amount of air mixed into the concentrated water causes a phenomenon in which the circulation supply efficiency of the concentrated water by the circulation pump of the concentrated water circulation supply unit is reduced, and also causes a problem of shortening the life of the circulation pump.

In addition, when the raw water diluted with the concentrated water containing a large amount of air is re-supplied to the reverse osmosis ion treatment unit, air remains in the reverse osmosis layer of the reverse osmosis membrane cartridge constituting the reverse osmosis ion treatment unit, thereby reducing the permeable filtration area. As a result, the water purification efficiency and lifespan of the reverse osmosis membrane cartridge are reduced and shortened, and the physical durability of the pipes is weakened and noise caused by cavitation caused by air.

KR No. 10-1026734 KR No. 10-2021-0004384 KR No. 10-1998-0016045 KR No. 10-2019-0043588

The purpose of the present invention, which was devised to solve the above problems, is to dilute the concentrated water recovered by passing the reverse osmosis membrane cartridges into the raw water requiring reverse osmosis treatment and supply it to the reverse osmosis ion treatment unit, so that the high concentration of ions is transferred to the reverse osmosis treatment unit. A concentrated water circulation supply type with a concentrated water dilution supply structure that suppresses local ion polarization of the reverse osmosis membrane cartridge through uniform dilution of raw water and concentrated water in order to prevent ion polarization caused by sticking to the membrane cartridge. The purpose is to provide an industrial water purification system.

The above object is achieved by the following configuration provided by the present invention.

The concentrated water circulation supply industrial water purification system having a concentrated water dilution supply structure according to the present invention,

It includes a hollow vessel in which a reverse osmosis chamber is formed, and a plurality of reverse osmosis membrane cartridges arranged in series in the reverse osmosis chamber formed in the vessel and removing ions remaining in the raw water supplied into the reverse osmosis chamber through the raw water supply unit. , a reverse osmosis ion treatment unit that separates purified water and concentrated water and drains them; a raw water supply unit supplying raw water to the reverse osmosis ion treatment unit; a concentrated water recirculation supply unit that recovers the concentrated water drained from the reverse osmosis ion treatment unit, dilutes the recovered concentrated water with raw water supplied by the raw water supply unit, and resupplies it to the reverse osmosis ion treatment unit; And a concentrated water dilution unit that quickly dilutes the raw water supplied through the raw water supply unit and the concentrated water supplied through the concentrated water recirculation supply unit and supplies the raw water to the reverse osmosis ion treatment unit,

The concentrated water dilution unit includes a concentrated water dilution tank having a multi-layer concentrated water dilution space with a raw water supply space formed between the outer wall member and the inner wall member,

A raw water water supply port is formed in the outer wall member of the concentrated water dilution tank to communicate with the raw water water supply space and the raw water water supply unit, and the inner wall member is formed with raw water blowing holes that eject the raw water supplied to the raw water water supply space into the concentrated water dilution space, A raw water drain is formed to communicate between the concentrated water dilution space and the reverse osmosis ion treatment unit.

The concentrated water dilution space is characterized in that a rotating concentrated water ejection member is disposed to rotate and eject the concentrated water supplied from the concentrated water recirculation supply unit into the concentrated water dilution space.

Preferably, the rotating concentrated water blowing member communicates with the concentrated water recirculation supply unit and has a concentrated water supply pipe shaft installed in a rotary structure in the concentrated water dilution space, and is arranged in a radial structure on the concentrated water supply pipe shaft to connect to the concentrated water supply pipe shaft. It is composed of a concentrated water agitation blower that agitates and ejects the supplied concentrated water in one direction into the concentrated water dilution space.

More preferably, the reverse osmosis membrane cartridge is composed of a hollow winding with a purification pore forming a discharge path of purified water from which ions have been removed while penetrating the reverse osmosis layer at the center of the reverse osmosis layer, which removes ions remaining in raw water. and are arranged in series in the reverse osmosis chamber of the vessel,

A serial connection ring is connected in series between the reverse osmosis membrane cartridges arranged in series while wrapping between the outer diameter surfaces of the reverse osmosis layers of the upper and lower reverse osmosis membrane cartridges; A series joint including a series joint pipe for serially connecting the purification holes by inserting both ends into the purification holes of the upper and lower reverse osmosis membrane cartridges is disposed.

In addition, the water purification system further includes a water separator for separating air remaining in the concentrated water by passing through the reverse osmosis membrane cartridges arranged in series to separate the concentrated water discharged from the reverse osmosis ion treatment unit,

The brackish water separation unit is configured to include a brackish water separation trap that stores concentrated water mixed with drained air at a set level and separates the concentrated water and air up and down by the difference in specific gravity between the concentrated water and air.

In addition, the brackish water separation trap has a concentrated water resupply pipe communicating with the concentrated water recirculation supply unit disposed at the bottom, and an exhaust valve through which air separated from the concentrated water is discharged at the upper portion,

Within the brackish water separation trap, a brackish water separation pad is disposed to divide the brackish water separation space upwards and downwards with a ventilation structure, and on the upper part of the brackish water separation pad, oil floats on top of the concentrated water through the deviation in specific gravity from the concentrated water stored in the lower layer. By forming a layer,

Concentrated water flowing into the air-water separation space of the air-water separation trap remains in the lower layer due to the difference in specific gravity from the oil layer and is discharged along the concentrated water re-supply pipe, and air with a lower specific gravity than the oil layer floats to the top and closes the exhaust valve. It is configured to be discharged through.

As described above, the present invention minimizes the amount of concentrated water generated, which requires a lot of cost for post-processing, and minimizes the formation of scale on the surface of the reverse osmosis membrane, resulting in very high stability compared to the existing two-stage RO process and a long cleaning cycle. As it becomes possible to take it with you, it is possible to reduce maintenance costs by extending the life of the reverse osmosis membrane, and the recovery rate of treated water is increased, resulting in improved productivity and economic efficiency.

In particular, in the present invention, in maximizing the recovery rate of purified water through recirculation of concentrated water, the circulation efficiency of the concentrated water circulation pump is improved by stably removing air bubbles remaining in the repeatedly circulated concentrated water. Air bubbles adhere to the reverse osmosis layer of the reverse osmosis membrane cartridge, reducing the water permeability and filtration area, and cavitation phenomenon prevents weakening the durability of pipes and noise.

In addition, the reverse osmosis type industrial water purification system according to the present invention continuously supplies raw water and raw water in which the concentrated water has been stably diluted to the reverse osmosis ion treatment unit through a concentrated water dilution unit with a unique stirring dilution structure, thereby performing reverse osmosis using a reverse osmosis membrane cartridge. Investment efficiency can be maintained continuously.

Figure 1 shows the overall configuration and purification process of a concentrated water circulation supply industrial water purification system with a concentrated water dilution supply structure proposed as a preferred embodiment of the present invention;
Figures 2 to 4 show the detailed configuration and operating status of the reverse osmosis ion treatment unit and the brackish water separation unit in the concentrated water circulation supply type industrial water purification system;
Figures 5 and 6 show the detailed configuration and operating state of the concentrated water dilution unit in the concentrated water circulation supply type industrial water purification system.

Hereinafter, with reference to the attached drawings, an industrial water purification system with a concentrated water circulation supply type having a concentrated water dilution supply structure proposed as a preferred embodiment of the present invention will be described in detail.

Figure 1 shows the overall configuration and purification process of a concentrated water circulation supply type industrial water purification system with a concentrated water dilution supply structure proposed as a preferred embodiment of the present invention, and Figures 2 to 4 show the concentrated water circulation supply system. In the industrial water purification system, the detailed configuration and operation of the reverse osmosis ion treatment unit and the brackish water separation unit are shown, and Figures 5 and 6 show the detailed configuration and operation of the concentrated water dilution unit in the concentrated water circulation supply type industrial water purification system. It shows the status.

The concentrated water circulation supply industrial water purification system (1) having a concentrated water dilution supply structure according to the present invention removes solid particles through pretreatment processes such as a coagulation sedimentation process, a biological treatment process, an UF treatment process, and a sterilization/disinfection process. It is a effluent reuse system that post-treats raw water from which ions have been removed through a reverse osmosis (RO) treatment process and continuously recovers purified water from which ions have been removed from the raw water.

As shown in FIG. 1, the high-recovery reverse osmosis membrane-type industrial water purification system (1) includes a plurality of reverse osmosis (RO) processes on raw water from which solid particles have been removed through a pretreatment process to filter out ions remaining in the raw water. One or more reverse osmosis ion treatment units 100 in which reverse osmosis membrane cartridges 120 are disposed to separate and discharge purified water from which ions have been removed and concentrated water in which the ions removed from the purified water remain concentrated; A raw water supply unit (200) that supplies raw water from which solid particles have been removed to the reverse osmosis ion treatment unit (100); And the concentrated water drained from the reverse osmosis ion treatment unit 100 is recovered, the recovered concentrated water is diluted with raw water supplied by the raw water supply unit 200, and the concentrated water is re-supplied to the reverse osmosis ion treatment unit 100. Includes a recirculation supply unit (300).

As shown in FIGS. 1 to 3, the reverse osmosis ion processing unit 100 is aligned in series with the hollow vessel 110 in which the reverse osmosis chamber 111 is formed, and the reverse osmosis chamber 111 formed in the vessel 110. It includes a plurality of reverse osmosis membrane cartridges 120 that are disposed to remove ions remaining in raw water supplied into the reverse osmosis chamber 111 through the raw water supply unit 200.

The reverse osmosis membrane cartridge 120 is located in the center of the reverse osmosis layer 121, which removes ions remaining in raw water, and has a water purification hole 122 that forms a discharge path for purified water from which ions have been removed while penetrating the reverse osmosis layer 121. It consists of the formed hollow winding.

In addition, the vessel 110 has a raw water supply port 112a formed on one side, a purified water drain port 114 communicating with the purified water hole 122 of the mounted reverse osmosis membrane cartridges 120 on the other side, and a mounted reverse osmosis membrane cartridge. It has a hollow reverse osmosis chamber 111 each formed with a concentrated water drain port 113a communicating with the reverse osmosis layer 121 of the two-membrane cartridge 120.

In addition, the reverse osmosis membrane cartridges 120 arranged in series within the vessel 110 bring the reverse osmosis layers 121 into close contact with each other to form a stable water permeability state between the reverse osmosis layers 121, and also form a stable water permeability state between the reverse osmosis layers 121. It is desirable to form a sealed communication state between them.

For this purpose, in this embodiment, as shown in FIGS. 2 and 3, between the reverse osmosis layers 121 of the reverse osmosis membrane cartridge 120 facing each other up and down, and between the water purification holes 122, are tightly adhered or communicated in a regular manner. A unique serial joint 130 is proposed so that a plurality of reverse osmosis membrane cartridges 120 are regularly connected in series within the reverse osmosis chamber 111.

The series joint 130 includes a series connection rim 131 that is connected in series while wrapping between the outer diameter surfaces of the reverse osmosis layers 121 of the reverse osmosis membrane cartridges 120 facing each other upward and downward; It includes a series joint pipe 132 that inserts both ends into the water purification holes 122 of the reverse osmosis membrane cartridges 120 facing each other in series to connect the water purification holes 122 in series.

Accordingly, the reverse osmosis membrane cartridges 120 arranged in series within the reverse osmosis chamber 111 are in close contact with each other in a concentric structure through the series connection rim 131 and the series joint pipe 132, thereby contributing to the reverse osmosis process of raw water. The phenomenon of raw water penetrating the reverse osmosis layer 121 leaking between the connected reverse osmosis layers 121 is suppressed, and purified water moving along the water purification hole 122 leaks between the reverse osmosis membrane cartridges 120, preventing raw water from leaking between the reverse osmosis layers 121. Prevent remixing.

In addition, the raw water supply unit 200, which supplies raw water to the reverse osmosis ion treatment unit 100, has a raw water supply pipe 210, and solid particles are distributed to the reverse osmosis ion treatment unit 100 along the raw water supply pipe 210. It includes a high-pressure raw water water pump 220 that supplies the removed raw water.

In this embodiment, four reverse osmosis ion treatment units 100 are connected in parallel to the raw water supply unit 200, and four reverse osmosis ion treatment units 100 are connected in parallel by one raw water supply unit 200. Raw water is distributed and supplied simultaneously.

In addition, the concentrated water recirculation supply unit 300, which recirculates and supplies the concentrated water drained from the reverse osmosis ion treatment unit 100 to the reverse osmosis ion treatment unit 100, is a concentrated water drain port of the reverse osmosis ion treatment unit 100 ( a concentrated water circulation pipe 310 connected between 113a) and the raw water supply pipe 210 of the raw water supply unit 200; A concentrated water circulation pump 320 disposed in the concentrated water circulation pipe 310 and supplying concentrated water drained through the concentrated water drain port 113a to the raw water supply pipe 210 along the concentrated water circulation pipe 310. Includes.

In this embodiment, the concentrated water drain ports 113a of the four reverse osmosis ion treatment units 100 are connected to the concentrated water recirculation supply unit 300 in a parallel structure, so that four reverse osmosis is performed by one concentrated water recirculation supply unit 300. Concentrated water drained from the two-ion treatment unit 100 is supplied in circulation.

Therefore, the raw water supplied to the reverse osmosis ion treatment unit 100 through the raw water supply unit 200 sequentially passes through the reverse osmosis layers 121 of the reverse osmosis membrane cartridges 120 to form purified water from which ions have been removed. It is stored in a water tank (not in the city) and used as high purity industrial water.

In addition, the concentrated water discharged through the concentrated water drain port 113a is recirculated and supplied to the reverse osmosis ion treatment units 100 through the concentrated water recirculation supply unit 300 and subjected to reverse osmosis treatment in the concentrated water recirculation/reverse osmosis process. This is carried out.

At this time, the concentrated water in which the concentrated ions remain is recirculated and supplied to the reverse osmosis ion treatment unit 100 in a diluted state with raw water, and when the concentrated water recirculation/reverse osmosis process is repeatedly performed to recover purified water, the concentrated water Since generation is minimized, the recovery rate of purified water is maximized.

In particular, when the concentrated water with high concentration of concentrated ions remaining is diluted with raw water and the residual concentrated ion concentration is lowered than the standard concentrated ion concentration and supplied through the concentrated water recirculation supply unit 300 as in the present embodiment, the reverse osmosis ions Ion polarization phenomenon in which high concentration of concentrated ions remain in the reverse osmosis layer 121 of the reverse osmosis membrane cartridge 120 constituting the processing unit 100 is suppressed.

In this embodiment, as shown in Figures 1 and 5 to 6, the raw water supplied through the raw water supply unit 200 and the concentrated water supplied through the concentrated water recirculation supply unit 300 are quickly diluted. A concentrated water dilution unit (600) with a unique dilution structure that supplies water to the reverse osmosis ion treatment unit (100) is added.

The concentrated water dilution unit 600 is a concentrated water dilution tank 610 having a multi-layer concentrated water dilution space 613 with a raw water supply space 610c formed between the outer wall member 610a and the inner wall member 610b. It includes a raw water supply opening 611 that communicates the raw water supply space 610c and the raw water supply unit 200 in the outer wall member 610a, and a raw water supply space 610c in the inner wall member 610b. Raw water ejection holes 610b-a are formed that eject the raw water supplied to the concentrated water dilution space 613.

In addition, a concentrated water ejection member 620 is disposed in the concentrated water dilution space 613 to spray the concentrated water supplied from the concentrated water recirculation supply unit 300 into the concentrated water dilution space 613.

The concentrated water blowing member 620 communicates with the concentrated water recirculation supply unit 300 and radiates to the concentrated water supply pipe shaft 621 installed in a rotating structure in the concentrated water dilution space 613, and the concentrated water supply pipe shaft 621. It includes a concentrated water stirring jet blade 622 that is disposed in a structure and agitates and jets the concentrated water supplied to the concentrated water supply pipe shaft 621 into the concentrated water dilution space 613 in one direction.

In addition, the concentrated water dilution space 613 is formed with a raw water drain 612 that communicates with the reverse osmosis ion treatment unit 100, so that the raw water diluted with concentrated water in the concentrated water dilution space 613 flows through the raw water drain ( It is distributed and supplied to the reverse osmosis ion treatment units 100 through 612).

Accordingly, the raw water supplied to the raw water supply space 610c through the raw water supply unit 200 is ejected into the concentrated water dilution space 613 through the raw water ejection hole 610b-a, and in this process, the concentrated water ejection member (620) stirs and dilutes the concentrated water with raw water in the concentrated water dilution space 613 through the concentrated water recirculation supply unit 300, so that the concentrated water is supplied to the reverse osmosis ion treatment unit 100 with uniformly diluted raw water. .

Therefore, the reverse osmosis type industrial water purification system 1 according to the present embodiment continuously supplies raw water and raw water in which the concentrated water has been stably diluted to the reverse osmosis ion treatment unit 100 through the concentrated water dilution unit 600, which has a unique stirring dilution structure. will be supplied.

In addition, the concentrated water circulation pipe 310 is provided with a three-way solenoid valve 331 that drains the concentrated water through the concentrated water discharge pipe 330 when concentrated ions higher than the standard concentrated ion concentration remain in the circulating concentrated water. is formed

In this embodiment, a cleaning agent is supplied to the reverse osmosis ion treatment unit 100 through the concentrated water circulation pipe 310 to supply a chemical that dissolves scale remaining in the reverse osmosis layer 121 of the reverse osmosis membrane cartridge 120. Add government (400).

In addition, on the suction and discharge sides of the concentrated water circulation pipe 130, and the concentrated water discharge pipe 330, there is a flow rate measurement sensor 341 that measures the flow rate of the moving concentrated water, and the amount of concentrated ions remaining in the concentrated water. A concentrated ion amount measurement sensor 342 to measure the concentrated ion amount and a pressure measurement sensor 343 to measure the pressure of the concentrated water are each disposed, and the measured values measured through each sensor are applied in real time to the controller unit (not shown). do.

Therefore, through the measured values applied through each of these sensors 341, 342, and 343, the controller unit (not shown) determines the circulating supply amount of concentrated water mixed with raw water through the concentrated water circulation pump 320 and the amount of concentrated water. The discharge amount and the cleaning cycle of the reverse osmosis membrane cartridge 120 using the chemical solution are automatically set and controlled.

Therefore, if a large amount of scale remains in the reverse osmosis membrane cartridge 120 of the reverse osmosis ion treatment unit 100 and the flow rate of treated water decreases by more than 15%, the concentrated water circulation pump 320 converts the stored cleaning agent into reverse osmosis ions. It is supplied to the treatment unit 100 to perform a chemical cleaning process to dissolve and remove scale remaining in the reverse osmosis membrane cartridge 120.

When performing the chemical cleaning process, the concentrated water circulation pipe 310 temporarily communicates with the chemical storage tank 410 to force circulation of the chemical stored in the chemical storage tank 410 to the reverse osmosis ion treatment unit 100. By supplying, the scale aggregated in the reverse osmosis membrane cartridge 120 of the reverse osmosis ion treatment unit 100 is dissolved and removed.

Thus, the formation of scale in the reverse osmosis membrane cartridge 120 constituting the reverse osmosis type ion treatment unit 100 is suppressed, thereby extending the chemical cleaning cycle of the reverse osmosis membrane cartridge 120 with the chemical solution, and as a result, frequent chemical cleaning is prevented. This suppresses the shortening of the lifespan of the reverse osmosis membrane cartridge 120 due to cleaning, improves the recovery efficiency of purified water, and minimizes the generation of concentrated water, thereby reducing the cost incurred due to post-processing of concentrated water.

Meanwhile, a large amount of air remains in the concentrated water that has passed through the reverse osmosis layer 121 of the reverse osmosis membrane cartridge 120 disposed in each reverse osmosis chamber 111, and the air is concentrated by the concentrated water circulation pump 320. This is the main factor that reduces water circulation efficiency.

And, when the raw water diluted with the concentrated water containing a large amount of air is re-supplied to the reverse osmosis ion treatment unit 100, air remains in the reverse osmosis layer 121 of the reverse osmosis membrane cartridge 120, thereby increasing the permeable filtration area. As a result, the water purification efficiency and lifespan of the reverse osmosis ion treatment unit 100 are reduced and shortened, and the durability of pipes is weakened and noise is caused by cavitation phenomenon caused by air.

In order to solve this problem, in this embodiment, a unique water separation structure is provided to remove air remaining in the concentrated water reverse osmosis in the vessel 110, and the reverse osmosis chamber of the vessel 110 is formed by the water separation structure. By removing the air remaining in the concentrated water re-supplied to (111), all problems caused by the air are eliminated.

As shown in FIGS. 1 to 4, the water separation structure according to the present invention is a cartridge arrangement space 111A in which reverse osmosis membrane cartridges 120 are arranged in series in the reverse osmosis chamber 111 formed in the vessel 110. ) and a concentrated water smoothing space ( 111B).

Preferably, the concentrated water smooth space 111B supports the side of the reverse osmosis membrane cartridge 120 aligned in the cartridge placement space 111A, so that the reverse osmosis membrane cartridges 120 are in series in the cartridge placement space 111A. Arrange the cartridge support frame 510 so that it is closely aligned.

Therefore, the concentrated water containing a large amount of air in the form of bubbles in the process of passing through the reverse osmosis layer 121 of the reverse osmosis membrane cartridge 120 disposed in the cartridge placement space 111A is not disposed in the reverse osmosis membrane cartridge 120. Air is removed by smoothing action while remaining in the hollow concentrated water smoothing space (111B).

In particular, in the present invention, a water separator 500 is provided to collect and remove the air remaining in the concentrated water smoothing space (111B) while minimizing loss of concentrated water, so that the air collected in the concentrated water smoothing space (111B) is removed. Aim for stable removal.

The brackish water separation unit 500 divides the concentrated water smooth space 111B into an upper layer where the brackish water discharge port 115 is formed and a lower layer where the concentrated water drain port 113 is formed, and a plurality of perforations 521 are formed. A water separator 520; It includes a brackish water separation trap 530 that stores concentrated water mixed with air discharged along the brackish water discharge port 115 at a set water level and separates the concentrated water and air up and down by the deviation in specific gravity between the concentrated water and air. .

In particular, in this embodiment, the water separation membrane 520 is disposed in the hollow portion of the hollow cartridge support frame 510 disposed in the concentrated water smooth space 111B to partition the cartridge support frame 510 upward and downward. .

In addition, an exhaust valve (532) is placed on the upper part of the nose separation trap 530, and when the set pressure in the nose separation trap 530 is reached, the exhaust valve 532 is temporarily opened to open the nose separation trap 530. The air trapped inside is discharged to the outside.

In addition, a concentrated water re-supply pipe 531 is disposed between the lower part of the brackish water separation trap 530 where the concentrated water from which the air has been removed is stored and the concentrated water circulation pipe 310 of the concentrated water recirculation supply unit 300.

In particular, in the present embodiment, a raw water separation pad 534 pushed downward by a spring 534a is disposed in the raw water separation trap 530, and the upper part of the raw water separation pad 534 maintains a specific gravity deviation from the concentrated water. By forming an oil layer 535 floating on the upper part of the concentrated water, the concentrated water flowing into the brackish water separation trap 530 as shown in FIG. 4 remains in the lower layer due to the deviation in specific gravity from the oil layer 535 and becomes concentrated water. Air discharged along the re-watering pipe 531 and having a lower specific gravity than the oil layer 535 floats to the top and is discharged through the exhaust valve 532, thereby minimizing leakage of the concentrated water and stably removing the air remaining in the concentrated water. Let it be achieved.

At this time, the water separation pad 534 flows up and down through the elastic expansion and contraction of the spring 534a, more quickly removing the air on the air bubbles remaining in the pad layer of the water separation pad 534, and floating them in the concentrated water. Allow the air to stably penetrate to the top.

More preferably, an ultrasonic oscillator 540 is disposed in the concentrated water smoothing space 111B in which the water separation membrane 520 is formed and the water separation trap 530, so as to penetrate into the concentrated water smoothing space 111B. The concentrated water introduced and the concentrated water introduced into the air-water separation trap 530 cause residual air to rise more quickly and be collected by ultrasonic vibration oscillated by the ultrasonic oscillator 540.

Therefore, the air removed from the concentrated water flowing into the concentrated water smoothing space (111B) penetrates the air-water separation membrane 120 and floats to the upper layer due to the difference in specific gravity from the concentrated water, thereby being first separated, and floats to the upper layer. Air, along with some of the concentrated water, flows into the brackish water separation trap 530 along the brackish water discharge port 115.

In addition, the concentrated water mixed with the air introduced into the air water separation trap 530 is secondaryly separated from the air due to the deviation in specific gravity from the oil layer 535, and the separated air is discharged to the outside through the exhaust valve 532. The concentrated water discharged to and from which the air has been removed is diluted with raw water through the concentrated water recirculation supply unit 300 through the concentrated water resupply pipe 531 and re-supplied to the reverse osmosis ion treatment unit 100, and the reverse osmosis ion treatment unit ( It is recovered as purified water through reverse osmosis treatment (100).

By removing the air remaining in the concentrated water circulated and supplied through the water separation structure including the water separation unit 500 according to this embodiment, the circulation efficiency of the concentrated water by the concentrated water circulation pump 320 increases, It is possible to overcome general problems such as a decrease in water purification efficiency of the reverse osmosis membrane cartridge 120 due to air.

The description of the present invention described above is for illustrative purposes, and those skilled in the art will understand that the present invention can be easily modified into other specific forms without changing the technical idea or essential features of the present invention. will be.

1. Industrial water purification system
100. Reverse osmosis ion processing unit
110. Vessel 111. Reverse osmosis chamber
111A. Cartridge storage space 111B. Concentrated water smooth space
112. Cartridge storage space 112a. raw water supply port
113. Concentrated water drain port 114. Purified water drain port
115. Air discharge port
120. Reverse osmosis membrane cartridge
121. Reverse osmosis layer 122. Water purification well
130. Series joint
131. Series connection rim 132. Series connection pipe
200. Raw water supply unit 210. Raw water supply pipe
220. Raw water supply pump
300. Concentrated water recirculation supply unit 310. Concentrated water circulation pipe
320. Concentrated water circulation pump 330. Concentrated water discharge pipe
331. Three-way solenoid valve
341. Flow measurement sensor 342. Concentrated ion amount measurement sensor
343. Pressure measuring sensor
400. Chemical washing unit 410. Chemical storage tank
500. Head separation part 510. Cartridge support frame
520. Brackish water separator 521. Perforated
530. Brackish water separation trap 531. Brackish water inlet
532. Concentrated water re-supply pipe 533. Exhaust valve
534. Brackish water separation pad 535. Brackish water separation oil film layer
540. Ultrasonic oscillator
600. Concentrated water dilution section
610. Concentrated water dilution tank 610a. Exterior wall member
610b. Inner wall member 610b-a. raw water vent
610c. Raw water supply space 611. Raw water supply port
612. Raw water drain 613. Concentrated water dilution space
620. Concentrated water stirring spout member 621. Concentrated water supply pipe shaft
622. Concentrated water blowing wing

Claims (5)

It includes a hollow vessel in which a reverse osmosis chamber is formed, and a plurality of reverse osmosis membrane cartridges arranged in series in the reverse osmosis chamber formed in the vessel and removing ions remaining in the raw water supplied into the reverse osmosis chamber through the raw water supply unit. , a reverse osmosis ion treatment unit that separates purified water and concentrated water and drains them; a raw water supply unit supplying raw water to the reverse osmosis ion treatment unit; a concentrated water recirculation supply unit that recovers the concentrated water drained from the reverse osmosis ion treatment unit, dilutes the recovered concentrated water with raw water supplied by the raw water supply unit, and resupplies it to the reverse osmosis ion treatment unit; And a concentrated water dilution unit that quickly dilutes the raw water supplied through the raw water supply unit and the concentrated water supplied through the concentrated water recirculation supply unit and supplies the raw water to the reverse osmosis ion treatment unit,
The concentrated water dilution unit includes a concentrated water dilution tank having a multi-layer concentrated water dilution space with a raw water supply space formed between the outer wall member and the inner wall member,
A raw water water supply port is formed in the outer wall member of the concentrated water dilution tank to communicate with the raw water water supply space and the raw water water supply unit, and the inner wall member is formed with raw water blowing holes that eject the raw water supplied to the raw water water supply space into the concentrated water dilution space, A raw water drain is formed to communicate between the concentrated water dilution space and the reverse osmosis ion treatment unit.
A concentrated water circulation supply type industrial application having a concentrated water dilution supply structure, characterized in that a rotating concentrated water blowing member is disposed in the concentrated water dilution space to rotate the concentrated water supplied from the concentrated water recirculation supply unit to the concentrated water dilution space. Water purification system. The method of claim 1, wherein the pivotable concentrated water jetting member communicates with the concentrated water recirculation supply unit and has a concentrated water supply pipe shaft installed in a rotary structure in the concentrated water dilution space, and a concentrated water supply pipe disposed in a radial structure on the concentrated water supply pipe shaft. A concentrated water circulation supply type industrial water purification system having a concentrated water dilution supply structure, characterized in that it includes a concentrated water agitating jet blade that agitates and ejects the concentrated water supplied to the shaft in one direction into the concentrated water dilution space. The method of claim 2, wherein the reverse osmosis membrane cartridge is a hollow wound material having a purification hole formed in the center of the reverse osmosis layer that removes ions remaining in the raw water and forming a discharge path for purified water from which ions have been removed while penetrating the reverse osmosis layer. It is configured and placed in series in the reverse osmosis chamber of the vessel,
A serial connection ring is connected in series between the reverse osmosis membrane cartridges arranged in series while wrapping between the outer diameter surfaces of the reverse osmosis layers of the upper and lower reverse osmosis membrane cartridges; Industrial use of a concentrated water circulation supply type having a concentrated water dilution supply structure, characterized in that a serial joint is disposed including a series joint pipe for serially connecting the purified water holes by inserting both ends into the purified water holes of the upper and lower facing reverse osmosis membrane cartridges. Water purification system. The method of claim 2, further comprising a water separator for separating the air remaining in the concentrated water by passing through the reverse osmosis membrane cartridges arranged in series to separate the concentrated water discharged from the reverse osmosis ion treatment unit,
The brackish water separation unit stores concentrated water mixed with drained air at a set water level and includes a brackish water separation trap that separates the concentrated water and air by the difference in specific gravity between the concentrated water and air. An industrial water purification system with a concentrated water circulation supply structure. The method of claim 4, wherein the brackish water separation trap has a concentrated water resupply pipe communicating with the concentrated water recirculation supply unit disposed at the bottom, and an exhaust valve through which air separated from the concentrated water is discharged at the upper portion,
Within the brackish water separation trap, a brackish water separation pad is disposed to divide the brackish water separation space upwards and downwards with a ventilation structure, and on the upper part of the brackish water separation pad, oil floats on top of the concentrated water through the deviation in specific gravity from the concentrated water stored in the lower layer. By forming a layer,
Concentrated water flowing into the air-water separation space of the air-water separation trap remains in the lower layer due to the difference in specific gravity from the oil layer and is discharged along the concentrated water re-supply pipe, and air with a lower specific gravity than the oil layer floats to the top and closes the exhaust valve. An industrial water purification system with a concentrated water circulation supply structure having a concentrated water dilution supply structure configured to be discharged through.