KR20130128866A - System and method for treating water using pressurized module - Google Patents

Abstract

Disclosed are a water treatment system and a water treatment method using a pressurized membrane module. The water treatment system using the pressurized membrane module disclosed includes a pressurized membrane including first and second ports respectively formed in the vertical direction at the upper and lower ends of the housing, and third and fourth ports formed in the horizontal direction at the upper and lower ends of the housing, respectively. In the water treatment apparatus using the module, Raw water tank for storing the raw water to be treated; And backwashing the pressurized membrane module with the production water and discharging the backwashing treatment water remaining in the pressurized membrane module through the second port at the pressure of the raw water supplied from the raw water tank to the third port. / May comprise a drainage unit.

Description

System and Method for Treating Water Using Pressurized Module

Exemplary embodiments of the present invention relate to a water treatment system and a water treatment method using a pressurized membrane module, and more particularly, the pollutant separated in the pressurized membrane module backwashing process is effectively drained through water pressure through water supply. It relates to a water treatment system and a water treatment method using a pressurized membrane module to be discharged.

Membrane has the advantage of not only separating particles that are not dissolved by selectively passing certain components, but also easily separating dissolved substances dissolved in a liquid and substances having different properties from certain substances. Particularly, the separation membrane can separate organic pollutants, inorganic pollutants, parasites, bacteria, etc. contained in water.

Membrane filtration technology using such a separation membrane can be treated in a smaller area than the filtration method, such as sand filtration, it is stable to raw water turbidity fluctuations and has fewer advantages. In addition, it is possible to obtain a favorable treatment water irrespective of the skill of the driver, and to easily automate the operation management, thereby ensuring stable water quality.

Separators used in water treatment are hollow fiber type, and there are a pressurized module and a submerged system in which hollow fiber bundles are embedded. In the pressurized module, the hollow fiber bundles are aligned in the casing. The casing has a pressure rating and, if necessary, causes the feed pump to run on the module in response to backwash pressure. Immersion drives the membrane without casing. The membrane is usually immersed in an open water bath and the filtered water of the membrane is drawn under vacuum.

However, the pressurized module can be operated for a certain period of time even at a pressure higher than the limit pressure, so that it is easy to maintain, and it is possible to supply the planned water supply amount per day .

Separation membranes can be separated into solid-liquid liquids with less energy, but fouling of membranes has a problem of degrading membrane performance. Pollution phenomenon is that suspended solids in the water or substances having a property of being easily adsorbed on the membrane surface accumulate on the membrane surface and pore size, thereby impeding the flow of fluid, thereby reducing the permeability.

Particularly, in the case of the pressurized module, the raw water is supplied from only one lower inlet port in the filtration process, and the produced water discharged from the separation membrane flows out to the upper outlet port. Therefore, the contamination of the separation membrane progresses more rapidly at the lower end portion where the raw water is supplied, There is a problem.

In the Republic of Korea Patent Publication No. 2012-0033674 in the filtration process, the supply direction of the raw water alternately in both directions through the opening formed in the upper end and the lower end of the pressurized module housing in a bidirectional way, so that the contamination of the inside of the case and the membrane is not biased Disclosed are a filtration system and a filtration method using a module.

In addition, the Republic of Korea Patent Publication No. 2011-0054507 discloses a water treatment method that reduces the amount of contaminants deposited on both ends of the hollow fiber membrane, and performs the bottom filtering and top filtering alternately so that the contaminants are uniformly deposited on the hollow fiber membrane Suggesting.

However, the above patent merely considers the contamination of the membrane along the water supply direction of the raw water in the filtration process, and does not recognize any discharge of the contaminants generated by the backwashing process and remaining in the pressurized membrane module. Therefore, when the drainage process performed after the backwashing process of the pressurized membrane module is performed in a natural flow method, contaminants generated through the backwashing process may not be effectively discharged, and thus, the efficiency of the backwashing process may be reduced.

Republic of Korea Patent Publication No. 2012-0033674 Republic of Korea Patent Publication No. 2011-0054507

Embodiments of the present invention are to provide a water treatment system and a water treatment method using a pressurized membrane module that can be effectively discharged to the outside of the module by draining the pollutant separated from the module inner membrane in the backwashing process through water pressure through water supply. .

According to an embodiment of the present invention, a water treatment system includes a pressurized membrane including first and second ports respectively formed in a vertical direction at an upper end and a lower end of a housing, and third and fourth ports formed in a horizontal direction at an upper end and a lower end of a housing, respectively. In a water treatment apparatus using a module, Raw water tank for storing the raw water to be treated; And backwashing the pressurized membrane module with the production water and discharging the backwashing treatment water remaining in the pressurized membrane module through the second port at the pressure of the raw water supplied from the raw water tank to the third port. Include a drainage unit.

In addition, in the water treatment system according to an embodiment of the present invention, the raw water tank and the third port may be connected through a water supply line and a water supply valve.

 In addition, the water treatment system according to an embodiment of the present invention, a supply unit for supplying the raw water to be treated to the pressurized membrane module, and for discharging the production water and concentrated water generated by treatment with the pressurized membrane module And a backwashing unit for backwashing the pressurized membrane module with the production water.

 Further, in the water treatment system according to an embodiment of the present invention, the supply unit includes a raw water pump, a raw water line connecting the front end of the raw water pump and a fourth port, and a first valve installed at the raw water line. can do.

In addition, in the water treatment system according to an embodiment of the present invention, the production unit is a production water storage tank for storing the production water that is treated with the pressurized membrane module to remove foreign substances in raw water, the production water storage tank and the first A production water line connecting the port, a second valve installed in the production water line, a concentrated water line connected to the third port to discharge the concentrated water out of the pressurized membrane module, and installed in the concentrated water line It may include a third valve to be.

Further, in the water treatment system according to an embodiment of the present invention, the backwashing unit includes a backwashing line connecting the first port and the production water storage tank, a backwash pump installed in the backwashing line, and the backwashing. It may include a fourth valve installed in the line.

In the water treatment system according to an embodiment of the present invention, the water supply / drainage unit may include a water supply line connecting a raw water line and a concentrated water line between the first valve and the raw water pump, and a water supply installed in the water supply line. It may include a valve, a drain line connected to the second port for discharging the backwashing water remaining in the membrane module to the outside of the pressurized membrane module, and a drain valve provided with the drain line.

The water treatment method according to an embodiment of the present invention, the pressure-type membrane comprising a first and second ports formed in the vertical direction at the upper end and the lower end of the housing and a third and fourth ports formed in the horizontal direction at the upper end and the lower end of the housing, respectively. In the water treatment method using the module, the raw water is supplied through the third port and at the same time the second port is opened to backwash the pressurized membrane module with the produced water, and then the backwash treatment water remaining in the pressurized membrane module. It includes a supply / drainage step of discharging through the second port at the water pressure of the raw water supplied to the third port.

In addition, the water treatment method according to the embodiments of the present invention, by supplying the raw water to the pressure-type membrane module through the fourth port to produce the production water and the concentrated water to discharge through the first and third ports, respectively ; Backwashing the pressurized membrane module by supplying production water through the first port, and backwashing treatment water generated at this time is discharged to the outside through a third port; And supplying the raw water through the third port and opening the second port to backwash the pressurized membrane module with the production water, and then supply the backwashing water remaining in the pressurized membrane module to the third port. It may include a supply / drainage step of discharging through the second port by the hydraulic pressure of the raw water.

In addition, in the water treatment method according to the embodiments of the present invention, air may be injected intermittently or continuously through the second port in the backwashing step.

In addition, in the water treatment method according to the embodiments of the present invention, the pressurized membrane module may include a fifth port formed in the vertical direction at the lower end of the housing.

In addition, the water treatment method according to embodiments of the present invention, in the filtration step, the raw water is supplied to the pressurized membrane module through the fourth port to produce the production water and the concentrated water, the production water is the first and Discharge through the fifth port, the concentrated water may be discharged through the third port.

In addition, the water treatment method according to the embodiments of the present invention, in the backwashing step, by supplying the production water through the first and fifth ports to backwash the pressurized membrane module, the backwashing treatment generated Water can be discharged to the outside through the third port.

In addition, in the water treatment method according to the embodiments of the present invention, the fifth port may be closed in the distribution / water supply stage.

Embodiment of the present invention by using the water pressure of the raw water supplied through the water supply process to effectively remove the contaminants remaining in the pressurized membrane module after the backwashing process externally to increase the removal efficiency of the pollutants.

In addition, in the embodiment of the present invention, since the drainage process and the water supply process are performed at the same time, the membrane filtration process cycle is shortened, thereby increasing the yield of the water treatment system.

These drawings are for the purpose of describing an embodiment of the present invention, and therefore the technical idea of the present invention should not be construed as being limited to the accompanying drawings.
Figure 1 schematically shows the water supply, filtration, backwashing and draining process of the conventional pressurized membrane module.
2 is a block diagram schematically illustrating a water treatment system according to an exemplary embodiment of the present invention.
3 to 5 are block diagrams for explaining the water treatment method according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

In the following detailed description, the names of the components are denoted by the first, second, and so on in order to distinguish them from each other in terms of the same names, and are not necessarily limited to those in the following description.

1 schematically illustrates a water supply, filtration, backwashing and draining process of a conventional pressurized membrane module.

Referring to FIG. 1, the unit process control of the pressurized membrane module generally consists of a water supply process, a filtration process, a backwash process, and a drainage process to form one membrane filtration process cycle.

The filtration process removes turbidity from the raw water by passing the raw water through the membrane, and takes 20 to 30 minutes, which takes up the most time in one membrane filtration cycle.

Subsequently, the backwashing process is a process for restoring the filtration function of the membrane by supplying filtrate water in a direction opposite to the filtration process to discharge the suspended substance attached to the separator in the filtration process, which takes approximately 30 to 120 seconds.

Next, the drainage process is a process of completely discharging the suspended matter and contaminants remaining inside the membrane module and the pipe to the outside after the backwash process. At this time, the drainage is discharged to the outside by natural flow through the lowermost port of the pressurized membrane module housing. Typically 40 to 180 seconds.

Finally, the water supply process removes air inside the membrane module and adds water to prevent damage to the membrane due to sudden pressurization. The time should be adjusted to ensure sufficient water supply in the membrane module, which takes about 60 seconds.

Since the conventional drainage process is a natural drainage method, there is a problem in that the efficiency of the backwashing process is lowered because the pollutants remaining in the pressurized membrane module generated through the backwashing process cannot be effectively discharged.

Accordingly, the present invention proposes a water treatment system and a water treatment method capable of effectively discharging the contaminants remaining in the module generated through the back washing process by the water pressure of the raw water supplied through the water supply process by performing the water supply and drainage process at the same time.

2 is a block diagram schematically illustrating a water treatment system according to an exemplary embodiment of the present invention.

Referring to Figure 2, the water treatment system 100 according to an embodiment of the present invention is to purify the waste / waste water, industrial waste water and the like.

The water treatment system 100 according to the embodiment of the present invention has a structure in which foreign substances in raw water to be treated as a pressurized membrane module are produced to produce purified water, and the module can be backwashed as produced water.

In addition, the water treatment system 100 according to an embodiment of the present invention has a structure capable of discharging the contaminants remaining in the module after backwashing using the water pressure of the raw water through the water supply.

To this end, the water treatment system 100 according to the embodiment of the present invention basically includes a raw water tank 10, a pressurized membrane module 20, a supply unit 30, a production unit 40, and a reverse The cleaning unit 50 and the water supply / drainage unit 60 are included.

The raw water tank 10 is a reactor for receiving unpurified raw water.

The pressurized membrane module 20 includes a housing, a separation membrane embedded in the housing, first and second ports 21 and 22 formed in the vertical direction at the upper and lower ends of the housing, and the upper and lower ends of the housing, respectively. And third and fourth ports 23 and 24 formed in the horizontal direction, respectively. The pressurized membrane module 20 may remove various foreign substances contained in raw water supplied from the raw water tank 10 through a built-in separator.

Here, the pressurized membrane module 20 may further have a fifth port (not shown) formed in the vertical direction at the lower end of the housing.

In the embodiment of the present invention, the supply unit 30 is for supplying the raw water to be filtered of the pressurized membrane module 20 from the raw water tank 10 to the pressurized membrane module 20.

The supply unit 30 is installed in the raw water pump P1, a raw water line L1 connecting the raw water tank 10 and the fourth port 24 of the pressurized membrane module 20, and the raw water line. The first valve V1 is included.

Here, the first valve V1 may be a solenoid valve type that opens and closes the flow path by an electrical signal, and likewise, various valves disclosed below may be made of a solenoid valve like the first valve V1.

In the embodiment of the present invention, the production unit 40 is for discharging the production water and concentrated water generated by the raw water is processed in the pressurized membrane module 20 to the outside of the membrane module.

The production unit 40 includes a production water storage tank 41 for storing the production water from which foreign substances are removed through the pressurized membrane module 20, and the production water storage tank 41 and the pressurized membrane module 20. A production water line L2 connecting the first port 21, a second valve V2 provided at the production water line L2, a third port 23 of the pressurized membrane module 20, and It is connected to the concentrated water line (L3) for discharging the concentrated water to the outside of the pressurized membrane module 20, and a third valve (V3) provided in the concentrated water line (L3).

In the embodiment of the present invention, the backwashing unit 50 is for backwashing the pressurized membrane module 20 with the production water.

To this end, a backwash line L4 connecting the production water storage tank 41 and the first port 21 of the pressurized membrane module 20 and a backwash pump installed in the backwash line L4 ( P2) and the fourth valve V4 are included.

In the exemplary embodiment of the present invention, the water supply / drainage unit 60 backwashes the pressurized membrane module 20 to the production water, and the backwash treatment in which the contaminants remaining in the pressurized membrane module 20 is dispersed. The water is discharged to the outside by using the pressure of the raw water supplied.

The supply / drainage unit 60 supplies raw water from the raw water tank 10 to the third port 23 of the pressurized membrane module 20 through the raw water pump P1 mentioned above, and at the same time The backwashing treatment water remaining in the pressurized membrane module 20 together with the raw water may be discharged to the outside through the second port 22.

To this end, the raw water tank 10 and the third port 23 of the pressurized membrane module 20 are connected through a water supply line L5 and a water supply valve V5.

The water supply / drainage unit 60 includes a water supply line L5 connecting the raw water line L1 and the brine water line L3 between the first valve V1 and the raw water pump as mentioned above, and the water supply line A drain line (L6) connected to the water supply valve (V5) installed at (L5) and the second port 22 of the pressurized membrane module (20) to discharge the backwashing water remaining in the membrane module to the outside. And a drain valve V6 provided in the drain line L6.

Hereinafter, with reference to the accompanying drawings the water treatment method by the wastewater water treatment system 100 according to an embodiment of the present invention configured as described above will be described in detail.

3 to 5 are block diagrams for explaining the water treatment method according to an embodiment of the present invention.

In the embodiment of the present invention, the water treatment process by the water treatment system 100, the filtration step (refer to Figure 3) to remove the foreign matter in the raw water, and the back washing step of backwashing the pressurized membrane module 20 as the production water ( 4), and the water supply / drainage mode (see FIG. 5) which discharges the backwashing water remaining in the pressurized membrane module after the backwashing to the outside by the water pressure of the supplied raw water.

First, referring to FIG. 3, in the filtration process according to the embodiment of the present invention, the first to third valves V1 to V3 are in an open state by a controller (not shown in the drawing). And the drain valves V4 to V6 are in a closed state, the raw water pump P1 is in an operating state, and the backwash pump P2 is in a stopped state.

In this state, the raw water stored in the raw water tank 10 is supplied to the fourth port 24 of the pressurized membrane module 20 through the raw water line L1 as the drive of the raw water pump P1.

Then, various raw materials contained in the raw water may be removed while the raw water passes through the separator in the pressurized membrane module 20.

In this way, the production water from which foreign substances in the raw water are removed through the pressurized membrane module 20 flows along the production water line L2 and may be stored in the production water storage tank 41.

Here, the concentrated water removed from the separator while passing through the pressurized membrane module 20 may be discharged to the outside by flowing the brine line L3 through the third port 23 of the pressurized membrane module 20. .

On the other hand, when the pressurized membrane module 20 has a fifth port (not shown) formed in the vertical direction at the lower end of the housing, the production water is discharged through the first and fifth ports 21 (not shown), and the concentrated water May be discharged through the third port 23.

Meanwhile, as described above, after the normal operation of the water treatment system 100 is performed for a predetermined time, in the exemplary embodiment of the present invention, it may be converted to a backwashing process as shown in FIG. 4.

First, in the backwashing step, the first and second valves V1 and V2 are closed, the fourth valve V4 is opened, the backwash pump P2 is operated, and the raw water pump P1 is stopped. . At this time, the third valve V3 is in an open state, and the water supply valve V5 and the drain valve V6 are in a closed state.

Then, the product water stored in the production water storage tank 41 may be supplied to the first port 21 of the pressurized membrane module 20 via the backwash line L4 by the pumping pressure of the backwash pump P2. Can be.

Therefore, the contaminants fixed to the pressurized membrane module 20 are backwashed and separated by the production water, and the backwashing treatment water in which the contaminants are dispersed is connected to the third port of the pressurized membrane module 20. 23) may be discharged along the brine line L3.

In this process, when necessary, the cleaning efficiency may be increased by intermittently or continuously supplying air through the second port 22 of the pressurized membrane module 20.

In addition, it is possible to increase the washing efficiency by supplying chemicals such as sodium hypochlorite or chlorine with the production water if necessary.

On the other hand, if the pressurized membrane module 20 has a fifth port (not shown) formed in the vertical direction at the lower end of the housing, the pressurized type by supplying the production water through the first and fifth ports 21 (not shown) The membrane module 20 may be backwashed, and the backwashing water generated at this time may be discharged to the outside through the third port 23.

When the backwashing process as described above is finished, the drainage / water supply process proceeds as shown in FIG. 5 in the embodiment of the present invention.

At this time, the water supply and drain valves V5 and V6 are opened, the remaining valves are closed, the raw water pump P1 is operated, and the backwash pump P2 is stopped.

Then, the raw water stored in the raw water tank 10 flows through the feed water line L5 through the raw water line L1 by the pumping pressure of the raw water pump P1 and passes through the concentrated water line L3 and pressurized membrane module ( 20 may be supplied to the third port 23.

At the same time, the backwashing treatment water in which contaminants remaining in the pressurized membrane module 20 are dispersed is discharged through the second port 22 through the second port 22 by the hydraulic pressure of the raw water supplied to the third port 23. Can be discharged to the outside.

Therefore, the backwashing water in which the pollutants remaining in the pressurized membrane module 20 are dispersed may be drained at a high flow rate by the water pressure of the supplied raw water.

On the other hand, when the pressurized membrane module 20 has a fifth port (not shown) formed in the vertical direction at the lower end of the housing, the fifth port is in a closed state in the drainage / water supply step.

As described above, in the embodiment of the present invention, a water supply process for supplying water into the pressurized membrane module 20 prior to the filtration process to prevent damage to the separator due to sudden pressurization, and backwashing generated through a backwashing process. The drainage process for discharging the treated water to the outside takes place at the same time.

As described above, according to the exemplary embodiment of the present invention, the back pressure-treated membrane module 30 is effectively discharged after backwashing the pressurized membrane module 30 as the production water. Backwashing efficiency can be increased.

In addition, as both the drainage process and the water supply process time are shortened, the production cycle may increase, thereby increasing the output of the water treatment system.

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, but, on the contrary, And it goes without saying that the invention belongs to the scope of the invention.

10... Raw water tank 20.. Pressurized Membrane Module
21 ... First port 22... Second port
23 ... Third port 24... 4th port
30 ... Supply unit 40... Production unit
41 ... Production water reservoir 50... Backwash unit
60 ... Feed / drain unit L1.. Enemies line
L2 ... Production line L3.. Brine line
L4... Backwash line L5... Watering line
L6... Drain line P1... Raw water pump
P2... Backwash pump
V1, V2, V3, V4, V5, V6 ... valve

Claims (14)

In a water treatment apparatus using a pressurized membrane module comprising first and second ports formed in the vertical direction at the upper and lower ends of the housing, and third and fourth ports formed in the horizontal direction at the upper and lower ends of the housing, respectively.
A raw water tank for storing raw water to be treated; And
After supplying the pressurized membrane module with backwashing to the production water, the backwashing treatment water remaining in the pressurized membrane module is discharged through the second port at the hydraulic pressure of the raw water supplied from the raw water tank to the third port. Drainage unit
Water treatment system using a pressurized membrane module comprising a. The method of claim 1,
The raw water tank and the third port is a water treatment system using a pressurized membrane module is connected via a water supply line and a water supply valve. The method of claim 1,
A supply unit for supplying raw water to be treated to the pressurized membrane module;
A production unit for discharging the produced water and the concentrated water generated by treatment with the pressurized membrane module;
Backwashing unit for backwashing the pressurized membrane module with production water
Water treatment system using a pressurized membrane module comprising a. The method of claim 3,
The supply unit includes:
With raw water pump,
A raw water line connecting the front end of the raw water pump and the fourth port;
A first valve installed in the raw water line
Water treatment system using a pressurized membrane module comprising a. The method of claim 3,
The production unit,
A production water storage tank which is treated with the pressurized membrane module and stores the production water from which foreign substances in raw water are removed;
A production water line connecting the production water storage tank and the first port;
A second valve installed at the production water line;
A concentrated water line connected to the third port and discharging the concentrated water to the outside of the pressurized membrane module;
A third valve installed in the brine line
Water treatment system using a pressurized membrane module comprising a. The method of claim 3,
The backwash unit is
A backwashing line connecting the first port and the production water storage tank,
A backwash pump installed in the backwash line,
A fourth valve installed in the backwashing line
Water treatment system using a pressurized membrane module comprising a. The method of claim 1,
The supply / drainage unit,
A water supply line connecting the raw water line and the concentrated water line between the raw water pump and the first valve,
A water supply valve installed in the water supply line;
A drain line connected to the second port to discharge the backwashing water remaining in the membrane module to the outside of the pressurized membrane module;
Drain valve in which the drain line is installed
Water treatment system using a pressurized membrane module comprising a. In the water treatment method using a pressurized membrane module comprising first and second ports formed in the vertical direction at the upper and lower ends of the housing and third and fourth ports formed in the horizontal direction at the upper and lower ends of the housing, respectively.
Raw water supplied to the third port by supplying the raw water through the third port and opening the second port to backwash the pressurized membrane module to the production water and then supplying the backwashing water remaining in the pressurized membrane module to the third port. / Drainage stage discharged through the second port by the water pressure of
≪ / RTI > The method of claim 7, wherein
A filtration step of supplying raw water to the pressurized membrane module through the fourth port to produce production water and concentrated water, and discharging the water through the first and third ports;
Backwashing the pressurized membrane module by supplying production water through the first port, and backwashing treatment water generated at this time is discharged to the outside through a third port; And
Raw water supplied to the third port by supplying the raw water through the third port and opening the second port to backwash the pressurized membrane module to the production water and then supplying the backwashing water remaining in the pressurized membrane module to the third port. / Drainage stage discharged through the second port by the water pressure of
≪ / RTI > The method of claim 7, wherein
In the backwashing step,
And water is injected intermittently or continuously through the second port. The method of claim 7, wherein
The pressurized membrane module includes a fifth port formed in the vertical direction in the lower end of the housing. The method of claim 10,
In the filtration stage,
Supplying raw water to the pressurized membrane module through a fourth port to produce produced water and concentrated water, wherein the produced water is discharged through the first and fifth ports, and the concentrated water is discharged through the third port. Way. The method of claim 10,
In the backwash phase,
Supplying the production water through the first and fifth ports to backwash the pressurized membrane module, wherein the generated backwashing water is discharged to the outside through the third port. The method of claim 10,
The fifth port is closed in the drainage / water supply stage.

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