KR100235682B1 - Reverse osmosis filtering type pure water system - Google Patents

Abstract

The present invention is a pressurized pump 25 for pressurizing the raw water passing through the micro filter 22 and the activated carbon filter 23 installed on the inlet line (L1) provided with the inlet valve 20, and condensed raw water in permeate water A drainage line (L2) provided with a membrane (29) for separating water, a storage tank (35) for storing the permeate passing through the membrane (29), a drain valve (32) for discharging the concentrated water, In the reverse osmosis water purification system for circulating filtration when the concentrated water is below a certain concentration, between the pressure pump 25 and the membrane 29 of the inlet line (L1) and the membrane 29 and the storage tank (35) of the purified water line (L3) The pressure sensors 26 and 36 are respectively installed between the two, and the electric conductivity sensor 33 for detecting the contamination state of the purified water is installed in the purified water line L3, and the pressure pump 25 of the inflow line L1 is provided. Between the inlet side and the drainage line (L2) and the water purification line (L3) is provided with a circulation line (L4) with a circulation valve 31, the predecessor of the inlet line (L1) A washing line L5 having a washing valve 30 is installed between the front of the refilter unit and the drain line L2 to pressurize the raw water pressurized by the input signals of the pressure sensors 26 and 36 and the conductivity sensor 33. Of the inlet valve 20, the pressure pump 25, and the circulation valve 31 by determining the operating pressure, the purified water pressure in the storage tank 35, and the contaminated state of purified water passing through the membrane 29. By controlling the operations of the washing valve 30 and the drain valve 32, the washing step for rinsing and draining the contaminants on the surface of the membrane 29 and the concentrated water existing in the system for a predetermined time, and the circulating filtration step of the normal operation step are continuously performed. The reverse osmosis water purification system to be executed.

Description

Reverse osmosis circulating filtration water purification system

The present invention relates to a reverse osmosis circulating filtration water purification system, in particular through the continuous circulation filtration process of the concentrated water generated in the reverse osmosis separation process of the raw water to maximize the recovery rate of the concentrated water to minimize the waste of raw water It is to overcome the disadvantage of wasteful reverse osmosis water purification system.

The prior art related to the present invention includes a reverse osmosis water purification system of Korean Patent Publication No. 95-5500, which allows the concentrated water to be recycled, as shown in FIG. Activated carbon adsorption filter unit 4 for adsorbing and removing tap water (raw water) introduced into the lower portion of the water, and reverse osmosis filter unit for separating the purified water (permeate water) and concentrated water through the activated carbon adsorption filter unit 4 ( 5) and a hydrostatic pressure storage tank 7 for storing the purified water or draining the purified water through the post-treatment filter part 8 and the sterilization part 9 under the control of the discharge cock 10, and the concentrated water. Concentrated water storage tank 15 for storing the water, a water quality sensor 18 for detecting the water quality of the concentrated water flowing into the concentrated water storage tank 15, and the water quality detection of a predetermined concentration or more by the water quality sensor 18 The water level in the brine drainage valve 14 and the brine storage tank 15 for draining the brine concentrate It consists of a sensor (16) (17) for sensing and a tap water / condensed water feed valve (12) (13) that operates to feed tap water and concentrated water according to the control of the pressure pump (6), which is a reverse osmosis water purification By installing the concentrated water storage tank 15 in the system and selectively recycling it according to the quality of the concentrated water, the life of the pretreatment filter unit 2 and the activated carbon adsorption filter unit 4 is extended, and the quality of the concentrated water is detected. By supplying and draining water, the reverse osmosis membrane filter is prevented from being damaged, and by recycling the concentrated water, the waste water of the concentrated water is relatively reduced, thereby reducing the cost.

In the conventional reverse osmosis water purification system, the recovery rate has been improved, but a separate bulky water storage tank had to be installed in the system, so that the volume of the system was increased as a whole. Since the sensor was installed to detect the water quality of the condensate instead of the purified water, there was a closed end where the water quality selection of the purified water (permeate) was incorrect, and the contamination of the membrane could not be accurately determined from the outside. There was a problem such as not being able to timely.

The present invention has been made in view of the above-described conventional problems, an object of the present invention is to minimize the waste of raw water by maximizing the recovery rate by continuous circulation filtration of the concentrated water produced in the reverse osmosis separation process It is intended to overcome the disadvantages of many reverse osmosis water treatment systems, and also to allow users to arbitrarily set the desired water quality to prevent water quality fluctuations of other permeated waters due to fluctuations in raw water quality and continuously permeate water with stable water quality. It is to provide a water purification system that supplies.

In addition, the present invention is capable of automatic continuous operation of the system by using the control unit PLC, and in the event of an abnormality in the system, self-diagnosis or self-measurement or error indication to the outside, so that the operation can be stopped so that the fault can be immediately removed. It is to provide a reverse osmosis water purification system that can be treated.

In order to achieve the above object, the present invention is installed on an oil line equipped with an inlet valve, and pressurized to pressurize raw water passed through a pretreatment filter part including a micro filter for removing suspended solids of raw water and an activated carbon filter for adsorbing oxidants. A pump, a reverse osmosis membrane that separates the raw water into permeate and concentrated water, a storage tank that stores the permeated water that has passed through the membrane through a purified water line, and a drain valve that discharges the concentrated water that has not passed through the membrane. In the reverse osmosis water purification system composed of a drainage line, a pressure sensor is installed between the pressurized pump and the membrane of the inlet line and between the membrane and the storage tank of the purified water line, and the electricity to detect the contamination state of the purified water in the purified water line Conductivity sensor is installed, between the inlet of the pressurized pump inlet and the drainage line and water purification line The circulation line is provided with a circulation valve and a check valve, and a cleaning line with a cleaning valve is installed between the front of the pretreatment filter part and the drain line of the inflow line to detect the signals detected by the pressure sensor and the electric conductivity sensor. Is input to the control unit, the concentrated water and membrane surface existing in the system that controls the operation of the inlet valve, the pressure pump, the circulation valve, the cleaning valve and the drain valve according to the operating pressure in the system, the pressure in the storage tank and the purified water. It is to provide a water purification system that can proceed to the washing step of washing and draining the pollutants for a certain time, the normal operation step, and the circulating filtration step of continuously circulating the concentrated water.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a conventional reverse osmosis water purification system.

2 is a block diagram of a reverse osmosis circulating filtration water purification system according to the present invention.

3 is a structural diagram of a membrane applied to the present invention.

4 is a developed state of the membrane applied to the present invention.

5 is a block diagram of a reverse osmosis circulating filtration water purification system according to the present invention.

6 is a control flowchart of a reverse osmosis circulating filtration water purification system according to a preferred embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

20: inlet valve 21: check valve

22: micro filter 23: activated carbon filter

24: check valve 25: pressure pump

26: pressure sensor 27: pressure gauge

28: pulsation arrester 29: membrane

30: cleaning valve 31: circulation valve

32: drain valve 33: electrical conductivity sensor

34: check valve 35: storage tank

36: pressure sensor 37: pressure gauge

38: ball valve 39: check valve

40: pressure sensor L1: inlet line

L2: Drain line L3: Water purification line

L4: Circulation Line L5: Cleaning Line

Figure 2 shows the overall configuration of the present invention, the present invention is installed on the inlet line (L1) provided with the inlet valve 20 to adsorb the micro peter 22 and oxidant to remove the suspended substances in the raw water A pressurized pump 25 for pressurizing the raw water passing through the pretreatment filter part made up of the activated carbon filter 23, a reverse osmosis membrane 29 for separating the raw water into permeate and concentrated water, and the membrane 29 Reverse osmosis pressure consisting of a storage tank (35) for storing the permeate through the water purification line (L3), and a drain line (L2) having a drain valve (32) for discharging the concentrated water that has not passed through the membrane (29). In the water purification system, pressure sensors 26 and 36 are respectively provided between the pressure pump 25 and the membrane 29 of the inflow line L1 and between the membrane 29 and the storage tank 35 of the water purification line L3. ) Is installed, the electric line to detect the contamination state of the purified water line (L3) A degree sensor 33 is installed, and a circulation line L4 having a circulation valve 31 is provided between the inlet side of the inlet line L1 and the inlet side of the inlet line L1 and the drain line L2 and the water purification line L3. It is installed, and the cleaning line (L5) having a cleaning valve 30 is provided between the pretreatment filter unit front of the inlet line (L1) and the drain line (L2).

In the drawings, reference numerals 21, 24, 34 and 39 are check valves, 27, 37 and 47 are pressure gauges, 28 are pulsation arresters, and 38 are ball valves installed in the storage tank 35.

3 is a block diagram illustrating the electrical block of the present invention. The present invention provides an operating pressure of a raw water pressurized by input signals of the pressure sensors 26 and 36 and the conductivity sensor 33 and the storage tank 35. The controller 40 determines the contaminated state of the purified water pressure and the purified water passing through the membrane 29 by the control unit 40 and the inlet valve 20, the pressure pump 25, the circulation valve 31, the cleaning valve 30, and the drainage water. By controlling the operation of the valve 32 and the discharge valve 38, the washing step, the normal operation step, and the concentrated water are continuously circulated for washing the contaminants on the surface of the concentrated water and the membrane 29 existing in the system for a predetermined time. It is controlled to be a circulating filtration step of filtering.

4 and 5 show the structure of the reverse osmosis membrane 29 used in the present invention, the present invention is to apply a spiral wound type membrane, which is to the feed water inlet (a) Inflow of raw water is passed through the filtration membrane (f) in which the separation membrane (d) (b), the carrier (c) and the spacer (e) are rolled up, filtered and discharged to the purified water discharge portion (g). The water is configured to be discharged to the concentrated water discharge part (h), and this scroll type has the largest surface area per unit volume and has a relatively small flow rate remaining inside the module. Applied to the system of the invention.

The membrane of the reverse osmosis water purification system is composed of a fine pore structure that can separate even ionic components, and before the membrane is supplied with raw water in order to suppress contamination by accumulation at the interface during the separation process or growth of bacteria in the apparatus. It is necessary to remove suspended solids (SS) and oxidizing agents (ozone, chlorine, etc.), which is called pretreatment. In this system, two pretreatment filter units, a micro filter 22 and an activated carbon filter 23, are used.

The micro filter 22 has a pore size of 5 μm, removes suspended substances, impurities, and the like, protects the high-pressure pump, and prevents plugging that may occur in the apparatus. The oxidant, organic matter, and the like that are not removed while passing through the micro filter 22 are adsorbed and removed through the activated carbon filter 23.

Here, the primary filtered raw water is pressurized by a pressure pump 25 to a pressure greater than osmotic pressure. At this time, the pulsation preventer 28 is pressurized to minimize pressure fluctuations due to periodic pulsation of the pressure pump 25. 25) and the membrane (29).

Referring to the operating procedure of the present invention configured as described above are as follows.

6 shows the control flow of the present invention. Once the system is operated, only the inlet valve 20 and the drain valve 32 are opened in the first step S1, and the pressure pump 25 is operated so that raw water is introduced. As a result, contaminants on the surface of the concentrated water and membrane 29 present in the system are washed and drained for a predetermined time.

After the above washing step (first step) is to proceed to the second step (S2), in this second step (S2) to close the drain valve 32 in order to reach the optimum operating pressure early and the actual constant is Started with.

In the second step S2, only the drain valve 32 is switched off and the rest is the same as in the first step S1.

In the second step (S2), if the operating pressure rises above the set pressure, the pressure sensor 26 detects this and sends a signal to the control unit 40, the circulation valve 31 is opened and the inlet valve 20 is The process proceeds to the third step (S3) to be closed. In other words, as the inflow of raw water is blocked, the circulating filtration step by recycling the concentrated water is started.

In the above circulating filtration step, the operating pressure drops as permeate is generated. In the fourth step of dropping to the low pressure point of the set pressure, the inlet valve 20 is opened again and the circulation valve 31 is closed. Return to step 2 (S2).

This is because the continuous repetitive motion of the normal circulation operation reads the signal of the pressure sensor 26 and controls the opening and closing of the inlet valve 20 and the circulation valve 31 by the command of the controller 40. In addition, through the arbitrary setting of the optimum operating pressure range of the pressure sensor 26, it is possible to adjust the amount of permeate as well as the quality of the desired permeate.

In the fifth step (S5) the permeated water is introduced into the storage tank 35 to increase the internal pressure of the storage tank 35, a predetermined amount or more flows into the pressure sensor 36 of the storage tank 35 side at a high pressure point. When it reaches, the display unit 50 displays the operation state "2", which means half the number, and automatically stops the system until the user uses the permeate.

When a certain amount of the permeate in the storage tank 35 is used in the fifth step S5, the pressure inside the storage tank 35 drops, and when the pressure sensor 36 falls below the high pressure point, the system automatically restarts.

As such, when the system is continuously used for a predetermined time, precipitates are formed on the surface of the membrane 29 to reduce the amount of permeated water and increase the electrical conductivity of the generated permeate. In the sixth step S6, the electric conductivity sensor 33 If the detected electric conductivity exceeds the set value, the display unit 50 indicates the operation mode "3", which means the membrane washing step, and in the seventh step, the inlet valve 20 and the drain valve 32 are opened and are in operation. Various contaminants on the surface of the generated membrane 29 are washed out. This process is referred to as a “washing step”, and the washing step prevents the water quality of the permeate from deteriorating due to fluctuations in the quality of the raw water and always obtains a constant water quality.

In addition, if the system is used for a long time, various ionic components that cannot be removed in the washing step (S7) are accumulated on the surface of the membrane 29, causing fouling, and the eighth step (S8). In the display unit 50, the error mode "0/3" is displayed on the display unit 50 by the command of the control unit 40. In this case, the membrane 29 should be cleaned using a freshener. In the case of the conventional reverse osmosis water purifier, it was difficult for the user to determine the correct timing by determining the time of cleaning or membrane replacement as the decrease in the amount of permeated water or the period of use. If does not fall below the set value, error mode "0/3" is displayed to indicate the correct cleaning cycle. The chemical cleaning may be selected according to the type of contaminants. In mode 4 and 5, if the pressurized pump 26 repeats the operation and stops every 5 minutes, the process proceeds for 30 minutes. At this time, each valve operation state is inflow valve 20 ON, circulation valve 31 OFF, washing valve 30 ON, drain valve 32 OFF, and the like.

In the present system, even when the following symptom is present, the control unit 40 detects this and displays an error indication on the display unit 50 to protect the device.

For example, when the pressure pump is overloaded due to excessive continuous operation, all errors indicate “0/1” so that the power supply to the system can be temporarily suspended from the outside, and separately from the storage tank 35 An additional external storage tank (not shown) is installed in the system, and a water level sensor that can detect the level of the external storage tank is connected to this system.When the external storage tank is full, “0/2” is displayed. To help.

In addition, when the supply of raw water is cut off or insufficient, the error mode " 0/4 " is displayed on the display unit to stop the system, thereby preventing idling of the pressurized pump 25.

In addition, even if the micro filter 22 and the activated carbon filter 23 in the inflow line or the pretreatment filter part are blocked or leak occurs due to foreign matter in the raw water, the error mode “0/4” can be displayed.

As described above, the present invention installs a circulation line with a circulation valve and a cleaning line with a cleaning valve between the inflow line, the drainage line, and the water purification line, thereby reducing the operating pressure of the raw water, the storage pressure in the storage tank, and the degree of contamination of the purified water. By detecting and controlling the opening and closing state of each valve, it is possible to execute the washing step, the normal operation step and the circulating filtration step to maximize the recovery rate by the continuous circulation filtration of the concentrated water generated in the reverse osmosis separation process. Accordingly, it is possible to minimize the waste of raw water, thereby overcoming the disadvantages of the reverse osmosis water treatment system with a lot of waste of water, and the electric conductivity sensor adjusts the set value from the outside so that the user can arbitrarily set the desired water quality. This prevents water quality degradation of permeated water caused by fluctuations in the quality of raw water. There is an effect that can supply the permeate of the water quality, and also, the present invention is capable of automatic continuous operation of the system by using the control unit (PLC), in the event of an abnormality in the system by self-diagnosis or self-resolution or error display The fault can be eliminated by allowing the operation to stop while displaying it externally.

Claims (4)

Inlet line (L1) with inlet valve (20), micro filter (22) and activated carbon filter (23) for adsorbing oxidant, pressurization pump (25) for pressurizing raw water, and separating raw water into permeate and concentrated water Reverse osmosis membrane (29), the storage tank 35 for storing the permeated water passing through the membrane 29 through the purified water line (L3), and to discharge the concentrated water that did not pass through the membrane 29 A drain line (L2) having a drain valve (32), and the reverse osmosis water purification system for circulating filtration when the concentrated water is below a certain concentration, between the pressure pump 25 and the membrane 29 of the inlet line (L1) And pressure sensors 26 and 36 are respectively installed between the membrane 29 and the storage tank 36 of the purified water line L3, and the electroconductive sensor for detecting the contamination state of purified water in the purified water line L3. 33) is installed, between the inlet side of the pressure pump 25 of the inlet line (L1) and the drainage line (L2) and water purification line (L3) The circulation line (L4) is provided with a circulation valve 31, the washing line (L5) provided with a washing valve 30 between the front of the pretreatment filter portion of the inlet line (L1) and the drain line (L2). Is installed, the operating pressure of the raw water pressurized by the input signal of the pressure sensor 26, 36 and the electrical conductivity sensor 33, the purified water in the storage tank 35 and the purified water transmitted through the membrane 29 Determination of the contamination state in the control unit 40 to control the operation of the inlet valve 20, the drain valve 32 by washing the condensate and the contaminants on the surface of the membrane 29 and the concentrated water present in the system, Reverse osmosis circulating filtration water purification system, characterized in that configured to execute the normal operation step and the circulating filtration step continuously. The reverse osmosis circulating filtration water purification system according to claim 1, wherein the control unit 40 allows the user to obtain a desired water quality permeation by changing a set value of the conductivity sensor 33. The method of claim 1, wherein the control unit 40 is configured to set the operating pressure range by changing the set values of the pressure sensors 26 and 36 so that the optimum operating conditions can be given according to the applied membrane. Osmotic circulation filtration water purification system. The system of claim 1, wherein the system further includes a display unit (50) indicating an error indication at the command of the control unit (40) when an abnormality such as supply of raw water is blocked.

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