KR100687768B1 - Water feed and distribution system and apparatus thereof - Google Patents

Abstract

The present invention provides a water supply and drainage system and its apparatus. In supplying the inflow-side primary water (raw water) of the partial membrane filtration apparatus, it is necessary to install a pipeline having an out-of-system flow path for the membrane surface passage, and to arrange at least one faucet controllable with each of the secondary water-based pipelines. Based on the two-way water supply and drainage system characterized by the device, the primary membrane surface permeate water is fully utilized to enable the long-term use of the permeate water by the usual microfiltration membrane or ultrafiltration membrane. If the permeation membrane is clogged during use, the permeate side valve is closed by the differential pressure switch as the differential pressure derived from the permeate side output pressure and the inflow side primary import pressure rises, and the membrane side is blocked by using a large amount of the pass through the primary side membrane surface. After the release, the permeate side valve is opened to resume the supply of the membrane permeate. In addition, an ultrafiltration membrane filter having a molecular weight of 50,000 to 500,000 is used as the filtration membrane to be employed. Preferably, a precision filtration membrane filter having a diameter of a blocking hole of 0.2 µm or less is used.

Water supply, filtration membrane, permeate

Description

Water supply and drainage system and its devices {WATER FEED AND DISTRIBUTION SYSTEM AND APPARATUS THEREOF}

1 is a flow chart showing the basic idea of the present invention. It is a schematic diagram which the water flow pressurized by the pump is introduce | transduced into a partial membrane filtration apparatus, and the membrane surface passage water and permeate water are obtained.

FIG. 2 is a check timer provided with a hydraulic pressure measuring point in each of the permeate side conduit and the inflow side conduit and operating the valve of the permeate side conduit according to the differential pressure, and installed in the branch conduit of the permeate side conduit. It is a schematic diagram explaining the system of releasing through a differential pressure switch by

3 is a schematic diagram showing an out-of-system water supply of water passing through a membrane surface of a partial membrane filtration device, and a water supply method in which permeate is connected to a water tank.

4 is connected to the out-of-system water supply and permeate water of the water passing through the membrane surface of the partial membrane filtration device to the drip tank, the supply of the filtered water can not catch up, the water level of the drip tank is lowered, the valve is operated by a water level sensor It is a schematic diagram of a system for supplying water.

Fig. 5 shows a schematic diagram in which a hydraulic pressure measuring point is provided in each of the permeate side conduit and the inflow side conduit to stop the valve of the permeate according to the differential pressure and cause the traffic light to blink.

FIG. 6 shows a schematic diagram in which water pressure measuring points are provided in each of the permeate side and the inflow side, and a booster pump operating in accordance with the differential pressure is installed in the inflow side.

** Description of Major Reference Codes **

1: separator

2: Membrane permeate (also called permeate) side of membrane module

3: permeate pipe of membrane module

4: Passage side pipe line

5: Membrane surface passing water side

6: Faucet directly connected to the passage side

7: Faucet connected to permeate pipeline

8: inlet with water pressure

9: differential pressure switch

10: Pressure measuring valve of permeate side pipe for off-site discharge operated by timer

11: Pressure measuring pipe of the permeate side pipe for discharge

12: on-off valve of permeate side line 13: partial membrane filtration device

14: tap water tank 15: water pipe

16: level sensor 17: traffic light

18: booster pump 19: tap water

20: water supply valve opening and closing valve 21: constant flow valve

a: Pressure measuring section of permeate side pipeline b: Pressure measuring section of transverse water side pipeline

In the present invention, when the raw water consisting of groundwater, industrial tap water, and tap water is subjected to microfiltration or ultrafiltration by a partial membrane filtration device, it is essential to maintain the cleanness of the surface of the filtration membrane, which is a pivotal function of filtration. The present invention relates to a system and an apparatus capable of ensuring permanent filtration while automatically and efficiently cleaning a membrane surface without using a cleaning device.

Recently, membrane filters are mainly used to purify water near the point of use. As the usage has evolved, the smaller and more compact ones come in the form of a faucet direct connection or under sink.

However, all the membrane filters used in these are disposable types that replace the filter cartridge when the filter is clogged. On the other hand, in the purified water divided into medium and large scales, the clogging state of the membrane filter is sensed by the filtration flow rate or the filtration differential pressure, and the backwash operation is performed manually or automatically.

According to this method, a back pressure pressurized pump, an air bubbling device, a backwash water discharge and a rinsing process, and the like are required, and as a result, the apparatus is not necessarily practical, such as complicated equipment or loss of energy.

As a method for preventing this, partial filtration of the structure of the water filtration device, that is, a method of incorporating a crossflow filtration device may be employed. In addition, a circulation pump, a circulation tank, etc. should be prepared, and flushing and concentrated water Along with the complicated process such as the discharge of water, defects such as energy loss and water recovery rate are pointed out.

In addition, as a principle of membrane filtration process, the system efficiently supplies water. When the water is filtered using a reverse osmosis membrane filter in the water supply system, untreated water, circulating water, and filtered water are directly sent to the place of use through the water supply pipe. A method (see Japanese Patent Laid-Open No. 2000-319944) has been proposed.

However, this method tends to cause clogging of the filter, and it is not practical because the method of controlling the cleaning of the reverse osmosis membrane cannot be solved.

On the other hand, when using the filtered water and untreated water at the same time, it is necessary to technically examine whether or not the filtration mechanism of the reverse osmosis membrane that requires high pressure can operate stably.

In addition, a method of treating well water and groundwater with a reverse osmosis membrane filter, treating water as a constant water, and using concentrated water for irrigation (see Japanese Patent Application Laid-Open No. 5-7873) has been proposed. This method operates by storing each water in a tank once, and the method of retaining pressure on the primary side is unclear, and there is also a question about the effectiveness of the reverse osmosis membrane filtration mechanism, and it is not used directly. It is not practical because it is needed.

As described above, in the present state, it is impossible to practically use the membrane filtration apparatus without any cleaning of the surface of the filtration membrane during use, and without replacing the filtration membrane for almost permanent or long term.

In view of the above circumstances of the present invention, an object of the present invention is to propose a method of employing a filtration membrane used for ordinary water treatment and water treatment at a membrane use efficiency of 100% without a special backwashing process and apparatus.

The present inventors have carefully studied to achieve the above object from this point of view, and as a result, by using alternating membrane-passing water (not using circulating water) and permeate water of partial membrane filtration (also called cross flow filtration), surprisingly special The present invention has been found by finding a method for treating water with 100% use efficiency without backwashing process and equipment.

That is, in the case of water treatment according to the conventional membrane filtration method, the filtered water is once stored in the filtered water tank, connected to the tap to the point of use, and circulated in the membrane filtration system as the circulating water.

In addition, a method is generally employed in which the permeate from the filtrate tank is reversed to wash at a predetermined time point, and the reverse water is washed, or the flushed water is flushed and washed at a high membrane surface velocity and then drained.

In the conventional membrane filtration method, the method is an orthodox method. However, the present inventors have carefully examined the circulating water used here, and as a result, when running as an out-of-system effluent directly connected to the faucet in a normal use mode, the present invention is uniform in the membrane filtration system. It was found that the degree of contamination on the surface of the filtration membrane was lower than that of the time circulating water.

This results in the effect of cleaning the membrane surface when passing through the membrane surface, it has been found that the use of alternating membrane membrane with the water permeate increases the chance of membrane surface cleaning. From these results, it was found that a direction in which the surface of the filtration membrane can be maintained normally and a stable cleaning effect can be obtained over a long period of time rather than the special backwater or back pressure water cleaning and / or flushing cleaning with high flow rate circulation water.

Based on these hints, the present inventors have found that the water treatment method can be reliably executed by setting up a constant condition for the use of this alternating material through repeated studies.

The gist of the present invention is to provide an inlet-side primary water of the partial membrane filtration apparatus, and to provide a conduit having an out-of-system flow passage for the membrane surface, and to arrange at least one faucet controllable with each of the permeate-side secondary water conduits. Based on the two-way water supply and drainage system characterized in that. Here, the control refers to a faucet that can be opened and closed including automatic control or manual, and may indicate an operation including an alarm at the time of control operation.

Further, by passing the secondary water side valve set to open and close according to the differential pressure derived from the permeate side output pressure and the inflow side primary import pressure, the passage of the permeate can be controlled.

In the control, it is also possible to set such that the water flow stop of the permeate side second order operated by the differential pressure is monitored by the differential pressure and released.

On the other hand, when the water level sensor is installed in the permeate side secondary sump tank from the partial membrane filtration apparatus, and the inflow is below the predetermined level, water from the tap water can be supplied to the sump tank.

On the basis of the above-mentioned differential pressure, the operation indication can be made at the time of valve opening and / or timer operation.

On the other hand, it has a booster pump that operates with a detection range determined according to the differential pressure derived from the permeate side output pressure and the inflow side primary import pressure, and the pressure of the raw water inlet, and the start and stop of membrane filtration is linked to the pressure difference in the pipeline. It can also be set to work.

As the filtration membrane, an ultrafiltration membrane filter having a molecular weight of 50,000 or more and 500,000 or less can be used, or as a filtration membrane, a microfiltration membrane filter having a stop hole diameter of 0.2 µm or less can be employed.

In the filtration membrane according to the present invention, a microfiltration membrane, an ultrafiltration membrane, or the like, which has a normal tap water pressure, that is, about 200 to 500 Kpa and sufficiently permeates water at room temperature, is preferable.

In other words, a case that receives the aid of a booster pump, a pressure difference of less than 1MPa and, using the flow rate 50L / m ² / hr or more, preferably a differential pressure 100MPa membrane flow rate of not less than 20L / m ² / hr under at room temperature. Outside of this specification, clogging of the filtration membrane frequently occurs when using ordinary water purification water from one or more faucets.

In particular, in the ultrafiltration membrane having a small fraction molecular weight as the shape of the filtration membrane, it is preferable that the skin layer, that is, the separation / fractionation membrane portion is crepe thinly or thinly as an asymmetric membrane, but this is not a limitation of the present invention.

On the other hand, in consideration of washing the membrane surface by use of the membrane surface passing water as general water, it is preferable that the membrane surface is flat and the small holes on the membrane surface are thin.

The type of the membrane filter module may be any one of a hollow membrane module, a spiral module and a pipe-type filter module. In addition, the material constituting the separator is an inorganic material, a metal, an alloy, a metal oxide and its sintered body (ceramic), glass, carbonaceous, high molecular organic cellulose, regenerated cellulose, cellulose derivative, cellulose organic acid ester, cellulose acetate, cellulose ester , Polyolefins such as polyethylene and polypropylene, polyvinyl chloride, polyvinylidene fluoride, polytetrafluoroethylene, polyvinyl alcohol, ethylene vinyl alcohol copolymer, polyacrylonitrile, polyacrylic acid and derivatives thereof, polyether, polyphenyl Ethers, polyesters, polycarbonates, polyurethanes, polyamides and derivatives thereof, polyimides and the like.

선처리, 친수기 그래프 등에 의해 친수화 처리한 것도 상관없이 사용할 수 있다. 중공계막의 제조법도 건식법, 습식법, 건습식법, 용융법 등 어떤 방법이라도 가능하지만, 비대칭막의 제조를 염두에 두면 습식법이 바람직하다.However, these may be any of them as main examples, but in consideration of contamination of the membrane surface by organic substances contained in trace amounts in water, it is preferable that they are hydrophilic rather than hydrophobic. However, even hydrophobic materials

It can be used irrespective of the hydrophilization treatment by pretreatment, hydrophilic graph or the like. The method of manufacturing the hollow membrane may be any method such as a dry method, a wet method, a dry wet method, or a melting method. However, a wet method is preferable in consideration of the production of the asymmetric membrane.

The differential pressure switch according to the present invention is, for example, formed by using two different pressures, a Bourdon tube and a micro switch, and opening and closing an electric circuit when a predetermined differential pressure is reached. .

The present invention is based on pressurizing raw water using a press-fit pump when using tap water pressure of tap water, tap water pressure of industrial tap water, or underground water, underground flow, or drift water. Booster pumps are used when tap water is used as raw water, or when water pressure is insufficient, or when two-stage pumps are used to control membrane separation.

As the primary water flowing into the apparatus of the present invention, tap water, industrial tap water, ground water, double flow water, drift water, and the like are used as described above. It must satisfy the criteria recognized as drinking water.

The indentation pump and booster pump used in the present invention are used for liquids of relatively low viscosity, such as mechanical pumps, vortex pumps, and reciprocating pumps.

The water level sensor referred to in the present invention refers to, for example, a so-called float switch in which the float detects the rise and fall of the liquid level and switches. That is, in this case, the lower limit liquid level detection position of the drip tank is set, and the instrument is set so that the float descends due to the lowering of the liquid level, and the magnet at the end of the arm opens the on / off valve contact of the water supply line. will be. The reed switch is sealed inside the system of the float switch, and the switch operates by the magnet magnetic force in the float.

These level sensors can be mounted in drip trays, either horizontally or vertically. However, it is necessary to use those bonded to the food hygiene method.

The on-off valve of the present invention is divided into two types according to the purpose: opening and closing by a signal from a differential pressure switch and opening and closing by a timer. And these operate through the controller as needed.

Any one of the above methods or systems can be assembled into a device.

Raw water that may be the target of the inflow side primary water of the present invention includes groundwater, double flow water, drift water, industrial tap water, tap water and the like.

Hereinafter, embodiments and configurations of the present invention and their cooperation will be described in detail with reference to FIGS. 1 to 6.

1 is a flow chart showing the basic idea of the present invention. It is a schematic diagram which the inflow side primary water (raw water) pressurized by the pump is introduce | transduced into a partial membrane filtration apparatus, and the passage surface water and membrane permeate water are obtained. That is, the inlet-side primary water (hereinafter sometimes abbreviated as raw water) 8 pressurized by the pump is introduced into the partial membrane filtration device 13. The introduced raw water is moved through the surface of the filtration membrane 1 to the passage water side conduit 4 and press-fitted into one or more faucets 6 at the point of use. On the other hand, the filtered water and the permeate which have passed through the separation membrane 1 are filled in the faucet 7 at the point of use through the permeate side conduit 3.

When the faucet 7 is opened in this state, membrane permeable water, that is, purified water is supplied as a living constant for drinking and cooking. On the other hand, when the faucet 6 is opened, raw water which has not been filtered is directly supplied, which is used for watering and watering of toilets. This state is referred to as "two-way water drainage" in the present invention. The water required by one person per day is composed of the constant and general water, and the ratio is about 1 to 10 to 1 to 30.

Thus, when the faucet 6 and the faucet 7 are alternately used, when the surface of the filtration membrane is blocked when the faucet 6 is used, the faucet 6 is neatly washed with the passage water, and when the faucet 7 is opened, that is, when the membrane is filtered, Adherent or sedimentary soils are usually removed.

Surprisingly, the present inventors confirmed that a stable binary water supply and drainage state is secured by such a mechanism, and the water purification treatment by the partial membrane filtration apparatus is stably maintained for a long time without requiring a special membrane cleaning process. The present invention proposes a method for making this system more stable.

In other words, the filtration membrane protection means is provided when the faucet 7 is opened to continuously use the permeate side purified water and the faucet 6 is rarely used.

2 is provided with a hydraulic pressure measuring point in each of the membrane permeate side and the inflow side, and the valve of the permeate side in accordance with the differential pressure to close the valve to prevent excessive contamination of the membrane. On the other hand, the valve 10 which is operated by the check timer installed in the branch line of the permeate side pipe is installed, and the differential pressure is checked every predetermined time, and if the differential pressure is less than or equal to the preset differential pressure, the valve 12 ) Is a schematic diagram of a system for releasing open).

That is, the pressure difference switch 9 between the water pressure measurement point a of the permeate side pipeline 3 and the water pressure measurement point b of the inflow water side pipeline, and the opening and closing of the permeate side pipeline which are opened and closed in direct connection with the signal of the differential pressure switch 9 The two-way feedwater provided with a permeate side duct and a hydraulic pressure branch duct 11 for providing a discharge valve 10 installed between the valves 12 and (a) and the on-off valve 12 to operate as a timer. Device.

In this system, when the differential pressure between (a) and (b) exceeds a preset value, the on-off valve 12 closes, and membrane filtration stops thereafter. Then, when the differential pressure between (a) and (b) recovers when the filtration surface is cleaned by using the water of the faucet 6 and the discharge valve 10 is opened, the signal from the differential pressure switch 9 The valve 12 is opened, and permeate can be obtained from the tap 7 again.

Fig. 3 is a schematic diagram showing a water supply method in which the out-of-system water supply and the membrane-permeated water of the membrane-passed water of the partial membrane filtration apparatus are connected to the tap water tank.

That is, a two-way water supply and drainage method is achieved in which a pipeline having a water supply 6 is directly connected to the membrane surface passage water outlet side of the partial membrane filtration device, and the membrane permeate outlet side is further connected to the tap water receiving tank 14. have.

In this system, it is also necessary to install a water pressure measuring branch pipe 11 for the permeate side pipe line having a differential pressure switch 9, an open / close valve 12, and a discharge valve 10 to prepare for an accident caused by a sudden blockage of the filtration membrane. desirable.

Fig. 4 connects the out-of-system water supply of the water passing through the membrane surface of the partial membrane filtration apparatus and the membrane permeated water (sometimes referred to as only permeate water) to the tap water trough, so that the water supply of the filtrate cannot follow, Down, it is a schematic diagram of a system for supplying constant water to a valve operated by a level sensor.

That is, in the two-way water supply and drainage method formed by directly connecting a pipeline having a water supply 6 on the membrane surface through-water outlet side of the partial membrane filtration apparatus, and connecting the permeate outlet side to a water reservoir tank 14 of the tap water. The differential pressure switch 9 is arranged between the vicinity a and the raw water inlet b. In the water supply method by the water treatment system in which the valve 12 which opens and closes by the signal of the said differential pressure switch 9 is installed in the piping downstream from the pressure detection point (a) of a filtration outlet, water supply to the water receiving tank 14 is carried out. The water level sensor 16 which sends a signal to the opening / closing valve 20 of the water supply pipe 15 is installed, and the valve 12 is closed and the inflow from the partial membrane filtration apparatus is stopped, or the water treatment system 5 to the water receiving tank 14 If the water supply from the water supply tank 14 is below the preset level, the valve 20 of the water supply water supply pipe 15 is opened to supply water to the water supply tank 14 from the water supply. It is shown.

On the other hand, when the drip tank 14 is filled with water, the water supply from the tap water supply pipe and the water treatment system is naturally set to be stopped by a separate control system, but the description is omitted because it is a self-explanatory method.

Fig. 5 shows a schematic diagram in which water pressure measuring points are provided in each of the permeate side conduit and the inflow side conduit, and the valve of the permeate is stopped based on the differential pressure, and the traffic light 7 blinks.

That is, in the two-way water supply and drainage system in which the outlet of the membrane surface passage water 5 of the partial membrane filtration device 13 and the outlet of the permeate water 2 are respectively connected directly to a pipeline having water supply, the permeate water 2 A traffic light 17 flashing by the signal of the differential pressure switch 9 between the exit (a) near the outlet and the inlet inlet (b) in the vicinity of the filtration water supply is provided, and a warning is given when the filtration membrane is closed. Closes the faucet (7) and stops use.

Subsequently, the membrane surface is washed by using only the water of the faucet 6, that is, the water passing through the membrane surface, and confirming that the signal lamp does not light with the signal from the differential pressure switch 9 even when the faucet 7 is opened. Permeate of (7) is used. The traffic light 17 may be a buzzer for notifying of an abnormality.

FIG. 6 shows a schematic diagram in which a hydraulic pressure measuring point is provided in each of the permeate side pipeline and the inflow side pipeline, and a booster pump operating in accordance with the differential pressure is installed in the inflow side pipeline. That is, the booster pump 18 which arrange | positions the differential pressure switch 9 which consists of the pressure of the permeate side secondary water outlet vicinity (a) and the inflow water side primary water inlet (b), and operates according to the signal of the said differential pressure switch 9 Is installed in the pipeline near the pressure detection point (b) of the inlet water inlet consisting of the water supply pipe 8 or the industrial water pipe 8 having a constant water pressure.

Normally, the membrane is filtered by the booster pump 18. When the differential pressure between (a) and (b) reaches a predetermined value or more, the booster pump 18 is stopped and the tap water is supplied to the tap water or industrial tap water. Only the pass-through water from 6) is supplied.

Hereinafter, the present invention will be described in detail according to the examples.

Example 1

A water purifier was installed so that industrial tap water was used as raw water and boosted by a booster pump to be introduced into a water treatment device (cross flow type ultrafiltration membrane separator). The ultrafiltration membrane filter used here is a cylindrical module having a membrane area of 50 m ² composed of a pressure-resistant hollow membrane having a fractional molecular weight of 80,000 made of polyvinylidene fluoride and a 0.005 µm equivalent stop hole diameter.

The permeate side outlet of this water purifying device was extended to the pipeline and directly connected to the three purified water faucets. On the other hand, the membrane surface passage water outlet (one-way passage in this example, not circulated) was also extended to the pipeline and directly connected to the six water taps for faucets.

A hydraulic pressure measuring point (a) near the permeate outlet and a hydraulic pressure measuring point (b) near the raw water inlet were provided, and a differential pressure switch was provided between (a) and (b). Also, the permeate side pipeline opening / closing valve, which is connected to the permeate side pipeline in direct connection to the signal of the differential pressure switch, is installed between the point (a) and the on / off valve, and is discharged to discharge purified water only for 10 seconds by operating as a timer manually or every 6 hours. A permeation side pipe line having a valve was provided with a branch line for measuring hydraulic pressure.

In this system, when the pressure difference between (a) and (b) exceeds 300 KPa, the permeate side pipeline opening and closing valve is set to close.

Turbidity 9 (mg / l), pH 6.9, hardness CaCO ₃ 98 (mg / l) evaporation residue 210 (mg / l), chlorine ion Cl 35 (mg / l), iron Fe0 .3 (mg / l), COD 4.2 (mg / l), chromaticity (degrees) 13, pressurized industrial tap water with 100 KPa water pressure Was opened and the raw water was treated with an initial pressure of 250 KPa.

Subsequently, the water supply faucet was closed, and the rectifier valve on the raw water inlet side was adjusted so that the amount of water discharged from the purified water faucet was 4.0 m ³ per hour. After passing water continuously in this state, the permeate side pipeline opening and closing valve was automatically closed after 34 hours, and the water treatment device stopped operation.

Subsequently, all three water faucet-side faucets were opened, and 10 m ³ of continuous water was discharged in 1 hour. After 6 hours, the permeate side channel opening / closing valve was automatically opened to become waterproof from the purified water faucet.

After this test run, the system was continued and the water was continuously passed for one year or more in the form of alternating use of purified water and general purpose water. Thus, stable purified water and general purpose water were obtained. In addition, the obtained purified water satisfied all 50 items of water quality standards by regular water quality test.

Example 2

Ten external pressure-type hollow microfiltration membrane modules (membrane area 20m ² ) made of hydrophilized polyethylene with a stop hole diameter of 0.1 μm were used. It was installed in the installed partial membrane filtration apparatus.

A pipe line having a water tap (faucet) for general purpose water was connected directly to the raw water outlet side of the treatment apparatus, and a tap water pipe line was connected to the filtered water (permeate) outlet side. On the other hand, the tap water tank is naturally connected to the tap water supply hydrant, and a water level sensor is installed in the water tank to send a signal for controlling the open / close valve of the tap water supply pipe.

Further, a differential pressure switch is arranged between the hydraulic pressure measurement point (a) near the filtered water outlet and the hydraulic pressure measurement point (b) near the raw water inlet, and a valve for opening and closing the valve according to the signal of the differential pressure switch is less than the pressure detection point (a) at the filtered water outlet. It was installed in the downstream filtered water pipeline. In this way, the valve is closed in the water supply line from the filtered water outlet of the water treatment apparatus to the sump tank, and the inflow of the partial membrane filtration apparatus into the sump tank is stopped, or when the amount of water flow from the water treatment apparatus into the sump tank is changed. In preparation for the above-mentioned water level, the water treatment system was opened so that the water supply pipe valve was opened to the drip tank to be supplied from the tap water to the drip tank.

Turbidity 9 (mg / l), pH 6.9, hardness CaCO ₃ 98 (mg / l) evaporation residue 210 (mg / l), chlorine ion Cl 35 (mg / l), iron Fe 0.3 ( mg / l), COD 0.11 (mg / l), chromaticity (degrees) 2, electrical conductivity (mS / m) of groundwater was treated by adjusting the membrane water permeation rate of 5m ³ / hour to 100KPa of raw water supply pressure per hour. Filtrate water was sent to the drip tank, and as a general purpose, it was used routinely to use the water tap on the side of the raw water outlet as needed. The water quality of membrane permeated water (membrane filtered water) supplied to the sump tank satisfied the stable water quality standard.

On the other hand, when the drip tank 14 was full, the water supply from a water supply water supply pipe and a water treatment system was stopped by the control system prepared separately. The details are omitted because they use ordinary means.

There's such a domestic water treatment systems to 2,000m ³ per day for more than a year in the establishments that need (drinking water, water all jobs) water, and almost without requiring the use of water (water that sometimes the water supply for security Degree) We continue stable driving.

As described above, according to the present invention using a partial membrane filtration method using a variety of water sources to supply purified water that meets the water quality standards, while washing the membrane surface with unfiltered circulating water to stabilize membrane filtration, Reasonably fractionated water can be used, and the utility of the present invention is convinced that it is industrially remarkable.

In the present invention, when using the inlet-side primary water (raw water) by microfiltration or ultrafiltration by a partial membrane filtration device, a partial membrane filtration device that automatically and efficiently cleans and permanently uses the filtration membrane surface without using a special cleaning device. The present invention proposes a system and an apparatus which always cleans the filtration membrane surface automatically only in normal operation.

That is, in the case of the washing process by the conventional partial membrane filtration method, the filtrate was once stored in the filtrate tank, the faucet was connected to the point of use, and circulated also in the membrane filtration system as the circulating water. In addition, a method of backwashing the filtered water from the filtrate tank at a predetermined time point and flushing or flushing at a high flow rate at the membrane surface has been generally employed.

According to the present invention, it is possible to keep the filtration membrane clean at all times in normal use without having to worry about this at all.

Claims (10)

In supplying the inflow-side primary water of the partial membrane filtration apparatus, a pipeline having a membrane surface passage water as an out-of-system flow path is provided, and at least one faucet that is controllable is disposed in each of the two membranes along with the permeate-side secondary water system. Two-way drainage system. The method of claim 1, And a two-way water supply and drainage system for displaying an operation including an alarm during the control operation. The method according to claim 1 or 2, A secondary water supply and drainage system, characterized by disposing a secondary water side valve set to open and close according to a differential pressure derived from a permeate secondary output pressure and an inflow primary pressure import pressure. The method of claim 3, wherein The two-way water supply and drainage system according to the control, wherein the water supply stop of the permeate side second order operated by the differential pressure is set to be released by monitoring the differential pressure with a check timer. The method according to claim 1 or 2, And a water level sensor is installed in the permeate secondary water receiving tank from the partial membrane filtration device, and when the inflow is below a predetermined level, water is supplied from the water reservoir to the drinking water from the tap water. The method of claim 4, wherein A two-way water supply and drainage system characterized by displaying the operation at the time of valve opening and closing and / or timer operation according to the differential pressure. The method of claim 3, wherein It has a booster pump that operates with a detection range determined according to the differential pressure derived from the permeate side output pressure and the inflow side primary import pressure, the pressure of the raw water inlet, so that the start and stop of membrane filtration can be operated in conjunction with the pressure difference in the pipeline. A two-way water supply and drainage system, characterized in that the setting. The method according to claim 1 or 2, A two-way water supply and drainage system, characterized in that an ultrafiltration membrane filter having a fractional molecular weight of 50,000 to 500,000 is used as a filtration membrane. The method according to claim 1 or 2, A two-way water supply and drainage system, characterized by using a precision filtration membrane filter having a diameter of 0.2 µm or less as a filtration membrane. Apparatus which employ | adopt the system of Claim 1 or 2.

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