Filter structure with selective water collection function at both ends and filtering method using the same

Abstract

The present invention includes: a first sealing part, having a first inlet and a second inlet, and at one end of a sealed shell, the first inlet is selectively opened and closed by a first switch valve, and the second inlet is selectively opened and closed by a second switch valve; a second sealing part, having a discharge port and a third inlet and a fourth inlet, and at the other end of the sealed shell, the discharge port is connected to an open end of one side of a water pipe, the third inlet is selectively opened and closed by a third switch valve, and the fourth inlet is selectively opened and closed by a fourth switch valve; and a control part, controlling the switching operation of the first and second switch valves and the switching operation of the third and fourth switch valves, and controlling the supply of raw water through any one of the first and second inlets or controls the supply of raw water through any one of the third and fourth inlets to form a forward fluid flow from the first sealing part to the second sealing part side or a reverse fluid flow from the second sealing part to the first sealing part side.

Description

Technical Field

[0001] The present invention relates to a filtering structure with a selective two-end water collection function and a filtering method using the same. More specifically, it relates to the following filtering structure and a filtering method using the same: by selectively changing the simple fluid flow of the filtering structure suitable for a water purifier system, the entire filtering area of ​​a separation membrane module whose contamination increases with the use time is evenly used, thereby delaying the contamination of the separation membrane and extending the service life of the filter. Background Art

[0002] Generally, a water purifier is a device that removes harmful substances from raw water such as tap water to supply pure drinkable water, and a filter structure is used as a core component for removing harmful substances.

[0003] With the development of water treatment technology for purified water and sewage, the direction of treatment technology has changed from the conventional sand filtration method to the membrane filtration method using a separation membrane.

[0004] This separation membrane technology is a highly separated filtration water treatment technology that almost completely separates and removes the treatment target substances in the treated water based on the pore size and pore distribution of the membrane and the charge on the membrane surface.

[0005] Separation membranes, which are core components, are classified into microfiltration membranes (MF membranes), ultrafiltration membranes (UF membranes), nano-separation membranes (NF membranes) and reverse osmosis membranes (RO membranes) according to the size of their pores. They are expanding their application range in the field of water treatment, such as the production of high-quality drinking water and industrial water, sewage / wastewater treatment and reuse, and clean production processes related to the development of zero-discharge systems.

[0006] This separation membrane technology is one of the core technologies that has attracted much attention recently in response to the trend of serious water pollution and is gradually becoming popular. In fact, most people use tap water that has been treated by water purifiers to reprocess it for drinking, so there is a growing demand for technological development in this regard.

[0007] On the other hand, the water purifier system is composed of a separation membrane module, pre-treatment and post-treatment filters, pumps, pipes, water tanks and other auxiliary devices. Among the components that constitute this system, the most important is the filtration structure, namely the separation membrane module.

[0008] The types of this filtration structure include flat plate type, hollow fiber type, tubular type, spiral type, etc. and have been commercialized. The main research is on the spiral separation membrane module filtration structure. The spiral separation membrane module filtration structure has a high insertion density of the separation membrane per unit area and can remove ions in water.

[0009] Usually, if Figure 1As shown, the filtration structure 1 includes a hollow cylindrical housing 10 and a separation membrane module 20 having a water passage 21 at the center of the body. The separation membrane module 20 is accommodated inside the housing 10 so as to contact the outer end of the brine seal 13 inside.

[0010] The housing 10 has a raw water inlet 31 for raw water to flow in at one side thereof, and has a purified water discharge port 35 for discharging purified water as produced water and a concentrated water discharge port 34 for discharging concentrated water at the other side thereof.

[0011] Accordingly, the filtering process of purifying raw water using the filtering structure is as follows: if pressure is applied through the raw water inlet to flow in one direction, the foreign matter contained in the raw water is filtered out by the separation membrane module built into the outer shell to achieve water purification, and the water filtered while passing through the separation membrane module, that is, the purified water, is collected in the water pipe and discharged to the outside through the discharge port, and the concentrated water remaining after purification is discharged to the outside through the concentrated water discharge port.

[0012] That is, the filtration structure is a phenomenon in which raw water is concentrated while flowing into the separation membrane module in one direction through the raw water inlet on the left side of the figure. Because of this phenomenon, membrane contamination begins to occur in the separation membrane module built into the shell from a portion close to the concentrated water discharge port, and the contamination is accelerated around the portion where the membrane contamination begins when comparing the filtration time.

[0013] As a result, the filtration performance of the separation membrane module is reduced. When the filtration performance is reduced to a predetermined level or more, the filtration structure is replaced with a new one.

[0014] In particular, the following technology has been developed for industrial water purification systems: high operating pressure is used to convert raw water into reverse flow, thereby physically backwashing pollutants attached to the surface of the separation membrane, or by chemically removing pollutants remaining in the separation membrane module through chemical cleaning using acid or alkaline compounds, thereby extending the service life of the separation membrane module.

[0015] However, physical backwashing that requires high operating pressure and chemical cleaning that requires chemical treatment are complex, difficult, and harmful to the human body, and are therefore difficult to apply to home water purifier systems. Therefore, it is necessary to develop technology to reduce the contamination of separation membrane modules in the filtration structure used in home water purifier systems. Summary of the invention

[0016] (Problem to be solved)

[0017] Therefore, the present invention is used to solve the problems mentioned above, and its purpose is to provide a filtering structure with selective two-end water collection function and a filtering method using the same, changing the structure so that the direction of raw water flowing into the separation membrane module as the center and the water outlet direction of clean water and concentrated water are two-way rather than unidirectional for selective cross-use, thereby evenly dispersing the phenomenon that concentrates in the concentrated water direction and begins to contaminate the separation membrane module to both sides, and the entire filtering area of ​​the separation membrane module can be evenly used.

[0018] The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above, and those having ordinary knowledge in the technical field to which the present invention belongs can clearly understand from the following description other technical problems not mentioned.

[0019] (Methods of solving the problem)

[0020] As a specific means for achieving the above-mentioned purpose, a preferred embodiment of the present invention provides a filtering structure with a selective two-end water collection function, including a shell and a separation membrane module, which filters and processes raw water passing through the separation membrane module into clean water and concentrated water, the shell is open at least on one side, the separation membrane module is arranged inside the shell and at least one filter sheet is wound around the outer surface of a water pipe that penetrates to form at least one inlet hole, the filtering structure includes: a first sealing portion, having a first inlet and a second inlet and a second inlet, and sealing one end of the shell, the first inlet and a second inlet being selectively opened and closed by a first switch valve, and the second inlet and a second inlet being selectively opened and closed by a second switch valve; a second sealing portion, having a discharge port and A third inlet and outlet and a fourth inlet and outlet, and the other end of the shell is sealed, the discharge port is connected to an open end of one side of the water pipe, the third inlet and outlet is selectively opened and closed by a third switch valve, and the fourth inlet and outlet is selectively opened and closed by a fourth switch valve; and a control unit controls the switching operation of the first and second switch valves and the switching operation of the third and fourth switch valves, and controls the supply of raw water through any one of the first and second inlets and outlets or controls the supply of raw water through any one of the third and fourth inlets and outlets to form a forward fluid flow from the first sealing part to the second sealing part side or a reverse fluid flow from the second sealing part to the first sealing part side.

[0021] Preferably, the control unit can control the forward filtering mode and the reverse filtering mode to be repeatedly executed more than once at a predetermined interval, wherein the forward filtering mode is that the raw water flowing in through the selectively opened inlet and outlet among the first and second inlet and outlet of the first sealing part forms a forward fluid flow from the first sealing part to the second sealing part side and is filtered at the same time, and the concentrated water is discharged to the outside through the selectively opened inlet and outlet among the third and fourth inlet and outlet of the second sealing part, and the clean water is discharged to the outside through the discharge port; the reverse filtering mode is that the raw water flowing in through the selectively opened inlet and outlet among the third and fourth inlet and outlet of the second sealing part forms a reverse fluid flow from the second sealing part to the first sealing part side and is filtered at the same time, and the concentrated water is discharged to the outside through the selectively opened inlet and outlet among the first and second inlet and outlet of the first sealing part, and the clean water is discharged to the outside through the discharge port.

[0022] Preferably, the control unit is electrically connected to a timer, and the timer generates an operation signal according to a preset time, and the operation signal of the timer controls the switching operation of the first and second switch valves to selectively open any one of the first and second entrances and exits, and controls the switching operation of the third and fourth switch valves to selectively open any one of the third and fourth entrances and exits.

[0023] Preferably, the control unit is electrically connected to a flow meter, and the flow meter measures in real time the amount of clean water discharged to the outside through the discharge port, and selectively opens any one of the first and second inlets and outlets by controlling the switching operation of the first and second switch valves based on an operation signal according to a change in the clean water discharge amount measured by the flow meter, and selectively opens any one of the third and fourth inlets and outlets by controlling the switching operation of the third and fourth switch valves.

[0024] Preferably, the control unit can control the cross-operation filtration between the forward filtration mode and the reverse filtration mode at intervals of 4 hours to 12 hours.

[0025] Preferably, the filtration structure with the selective two-end water collection function includes a sealing portion, which separates the raw water supplied through the separation membrane module from the concentrated water discharged from the separation membrane module to prevent them from mixing. The sealing portion may include: a first isolation seal, which is arranged on the outer surface of one side end of the separation membrane module corresponding to the first sealing portion, so that the outer end contacts the inner surface of the shell; and a second isolation seal, which is arranged on the outer surface of the other side end of the separation membrane module corresponding to the second sealing portion, so that the outer end contacts the inner surface of the shell.

[0026] In addition, a preferred embodiment of the present invention provides a filtering method using a filtering structure with a selective two-end water collection function, having a filtering structure, the filtering structure including a housing and a separation membrane module, filtering and processing raw water passing through the separation membrane module into clean water and concentrated water, the housing being open at least on one side, the separation membrane module being arranged inside the housing and at least one filter sheet being wound around the outer surface of a water pipe penetrating through to form at least one inlet hole, the filtering structure including: a first sealing portion having a first inlet and a second inlet and a sealing portion for sealing one end of the housing, the first inlet and a second inlet and a sealing portion for sealing one end of the housing, the first inlet and a second inlet and a sealing portion for sealing the other end of the housing, the discharge port being connected to an open end of one side of the water pipe, the third inlet and a third inlet and a fourth inlet and a sealing portion for sealing the other end of the housing, the discharge port being connected to an open end of one side of the water pipe, the third inlet and a third inlet and a fourth inlet and a sealing portion for controlling the switching operation of the first and second switching valves and the switching operation of the third and fourth switching valves. The filtering method includes: a forward filtering mode step, in which raw water flowing in through the selectively opened inlet and outlet of the first and second inlets of the first sealing part is filtered by the separation membrane module while forming a forward fluid flow from the first sealing part to the second sealing part side through the control part, concentrated water is discharged to the outside through the selectively opened inlet and outlet of the third and fourth inlets of the second sealing part through the control part, and clean water is discharged to the outside through the discharge port; a reverse filtering mode step, in which raw water flowing in through the selectively opened inlet and outlet of the third and fourth inlets of the second sealing part is filtered by the separation membrane module while forming a reverse fluid flow from the second sealing part to the first sealing part side through the control part, concentrated water is discharged to the outside through the selectively opened inlet and outlet of the first and second inlets of the first sealing part through the control part, and clean water is discharged to the outside through the discharge port. The forward filtering mode step and the reverse filtering mode step are repeatedly performed at intervals of a predetermined time by the control part more than once.

[0027] Preferably, the cross-running filtering between the forward filtering mode step and the reverse filtering mode step can be performed by an operation signal of a timer, and the timer generates an operation signal according to a preset time.

[0028] Preferably, the cross-running filtration between the forward filtration mode step and the reverse filtration mode step can be operated by an operation signal based on a change value of the clean water discharge volume measured by a flow meter, and the flow meter measures in real time the discharge volume of the clean water discharged to the outside through the discharge port.

[0029] Preferably, the crossover operation time between the forward filtration mode step and the reverse filtration mode step can be operated at a time interval of 4 hours to 12 hours.

[0030] (Effects of the Invention)

[0031] The preferred embodiments of the present invention described above have the following effects:

[0032] The flow of raw water that is filtered and treated while passing through the separation membrane module configured in the filtration structure is cross-controlled by the control unit between the forward filtration mode and the reverse filtration mode to be periodically executed in two directions rather than in one direction. As a result, the contamination of the separation membrane module that is concentrated and started in the discharge direction of the concentrated water can be dispersed to both sides. Therefore, the entire filtration area of ​​the separation membrane module can be evenly used, and the contamination phenomenon that is accelerated after the contamination of the separation membrane module occurs can be delayed, thereby extending the service life of the filtration structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a cross-sectional view showing a general filtering structure.

[0034] Figure 2 It is a cross-sectional perspective view showing a filtering structure with a selective two-end water collection function according to an embodiment of the present invention.

[0035] Figure 3 It is an exploded perspective view showing a filtering structure with a selective two-end water collection function according to an embodiment of the present invention.

[0036] Figure 4 It is a cross-sectional view showing a filtering process when raw water flows into the filtering structure with a selective two-end water collecting function according to an embodiment of the present invention in a forward direction.

[0037] Figure 5 It is a cross-sectional view showing the process of filtering when raw water flows in reverse in the filtering structure with the selective two-end water collecting function according to the embodiment of the present invention.

[0038] Figure 6 is a graph showing the correlation between produced water flow rate and filtration operation time.

[0039] Figure 7 shows the contamination state of the separation membrane module separated and disassembled after the filtration operation,

[0040] (a) is a separation membrane module of a comparative example,

[0041] (b) is the separation membrane module of Example 4. DETAILED DESCRIPTION

[0042] Hereinafter, the preferred embodiments will be described in detail with reference to the accompanying drawings so that a person having ordinary knowledge in the technical field to which the present invention belongs can easily implement the present invention. However, in the process of describing in detail the structural principle of the preferred embodiments of the present invention, if it is determined that the detailed description of the relevant known functions or structures may make the main points of the present invention unclear, the detailed description will be omitted.

[0043] In addition, in all the drawings, the same reference numerals are used for parts having similar functions and effects.

[0044] Furthermore, in the entire specification, when a part is "connected" to another part, it includes not only the case of "direct connection" but also the case of "indirect connection" with other parts in between. In addition, "including" a certain component means that other components may be included unless there is a special record to the contrary, and it does not mean that other components are excluded.

[0045] like Figure 2 and Figure 3 As shown, the filtering structure 100 with the selective two-end water collection function according to the embodiment of the present invention includes: a housing 110 , a separation membrane module 120 , a first sealing part 130 a and a second sealing part 130 b , and a control part 140 .

[0046] The housing 110 is a hollow cylindrical member with at least one end opened and disposed in the inner space of the separation membrane module 120 .

[0047] The housing 110 is shown and described as a hollow cylindrical component having an opening at one end corresponding to the first sealing portion 130a, but is not limited thereto and may also be a hollow cylindrical component having an opening at the other end corresponding to the second sealing portion or having openings at both ends corresponding to the first and second sealing portions.

[0048] The separation membrane module 120 is arranged inside the shell 110, and at least one filter sheet fixed at one end to the outer surface of the water pipe is wound into a roll shape so that the water pipe 121 is arranged at the center inside the main body. The water pipe 121 has at least one inlet hole 122 formed on the outer surface and has a predetermined length.

[0049] The water pipe 121 may be composed of a hollow pipe member having a predetermined length, with either end or both ends being open and having at least one inlet hole 122 formed in the middle of the length for the clean water as the produced water to flow in.

[0050] The filter sheet of the separation membrane module formed by winding the water pipe into a roll shape may be composed of a membrane sheet and a permeate sheet.

[0051] Here, the membrane sheet may be one or more selected from a polyamide separation membrane, a polyimide separation membrane, a polysulfone separation membrane, and a polyethersulfone separation membrane, and preferably may be a polyamide separation membrane.

[0052] The permeable sheet may be in the form of felt, paper, non-woven fabric, etc., in which fiber filaments are combined, or may be warp-knitted paper in which fiber filaments are woven mutually in the form of weft yarns and warp yarns.

[0053] The filter sheet composed of the membrane sheet and the permeable sheet is laminated and bonded through a bonding wire applied so as to open the side corresponding to the water pipe, and is wound in a roll form on the outer surface of the water pipe in a state of laminating multiple layers.

[0054] The first sealing portion 130a includes a first inlet and outlet 131 and a second inlet and outlet 132 and seals an open side end of the housing 110. The first inlet and outlet 131 is selectively opened and closed by a first opening and closing valve 131a, and the second inlet and outlet 132 is selectively opened and closed by a second opening and closing valve 132a.

[0055] The first and second inlets and outlets 131, 132 are shown and explained as correspondingly inserting the sealing cover 112 at the open end of the shell, and the first and second inlets and outlets 131, 132 are configured as hollow pipe components extending outwardly at the end of the sealing cover 112 by a predetermined length, but are not limited to this, and can also be configured as hollow pipe components extending outwardly at the sealed end of one end of the shell 110 by a predetermined length.

[0056] Then, the first and second switch valves for selectively opening and closing the internal channels of the first and second inlets 131 and 132 can be configured as manual valve components operated by manual opening and closing or electronic valve components operated by the electrical signal of the control unit 140 described later.

[0057] Similar to the first sealing portion, the second sealing portion 130b includes a third inlet and outlet 133 and a fourth inlet and outlet 134, and closes the other open side end of the housing 110, the third inlet and outlet 133 is selectively opened and closed by a third switch valve 133a, and the fourth inlet and outlet 134 is selectively opened and closed by a fourth switch valve 134a.

[0058] The third and fourth inlets 133 and 134 are shown and described as being configured as hollow pipe components with a predetermined length extending outward from the sealed end portion at the other open end of the housing 110, but are not limited thereto. They may also be configured as hollow pipe components with a predetermined length extending outward from the end portion of the sealing cover with a corresponding sealing cover inserted at the other open end of the housing.

[0059] Then, similar to the first sealing part, the third and fourth switch valves that selectively open and close the internal channels of the third and fourth inlets and outlets 133 and 134 can be configured as manual valve components that are manually switched on and off or electronic valve components that are switched on and off by electrical signals from the control unit 140 described later.

[0060] The second sealing portion 130 b may include a discharge port 135 connected to an open end of the water pipe 121 to discharge the filtered output water, ie, purified water, from the raw water passing through the separation membrane module 120 to an external sheet.

[0061] The control unit 140 controls the switching operation of the first and second switch valves 131a and 132a configured in the first sealing part 130a, and controls the switching operation of the third and fourth switch valves 133a and 134a configured in the second sealing part 130b, thereby controlling the operation of the filtration process so that the forward filtration mode and the reverse filtration mode are repeatedly executed more than once at a predetermined interval, wherein the forward filtration mode is that the raw water forms a forward fluid flow from the first sealing part 130a to the second sealing part 130b side, and the reverse filtration mode is that the raw water forms a reverse fluid flow from the second sealing part 130b to the first sealing part 130a side.

[0062] This control unit 140 is electrically connected to a timer, and the timer generates an operation signal according to a preset time. The operation signal of the timer controls the switching operation of the first and second switch valves 131a and 132a arranged in the first sealing part 130a, thereby selectively opening any one of the first and second entrances and exits, and controls the switching operation of the third and fourth switch valves 133a and 134a arranged in the second sealing part 130b, thereby selectively opening any one of the third and fourth entrances and exits 133 and 134.

[0063] In addition, the control unit 140 is electrically connected to a flow meter, which measures in real time the amount of clean water discharged to the outside through the discharge port 135, and selectively opens any one of the first and second inlets and outlets 131 and 132 by controlling the switching operation of the first and second switch valves 131a and 132a arranged in the first sealing part 130a based on an operation signal according to the change value of the clean water discharge amount measured by the flow meter, and selectively opens any one of the third and fourth inlets and outlets 133 and 134 by controlling the switching operation of the third and fourth switch valves 133a and 134a arranged in the second sealing part.

[0064] On the other hand, a sealing portion that separates raw water supplied to pass through the separation membrane module and concentrated water discharged from the separation membrane module 120 to prevent mutual mixing may be included between the housing 110 and the separation membrane module 120 .

[0065] The sealing portion may include a first isolating seal 123 and a second isolating seal 124, wherein the first isolating seal 123 is arranged on the outer surface of one side end of the separation membrane module corresponding to the first sealing portion 130a so that the outer end contacts the inner surface of the outer shell, and the second isolating seal 124 is arranged on the outer surface of the other side end of the separation membrane module 120 corresponding to the second sealing portion 130b so that the outer end contacts the inner surface of the outer shell 110.

[0066] Preferably, the separation membrane module 120 arranged inside the shell can achieve bidirectional sealing rather than unidirectional sealing by configuring the first and second isolation seals 123 and 124 outside the two ends of the separation membrane module for water collection at both ends, thereby preventing the raw water from flowing into the concentrated water side even if the raw water flows in from any direction.

[0067] That is, if the raw water flows into the concentrated water side, the amount of permeated water will decrease and the desalination rate will decrease due to the operating pressure loss. Therefore, a sealing part can be configured, and the first and second isolation seals can be attached to the two side ends of the separation membrane module respectively, or a seal can be configured in the separation membrane module to achieve two-way sealing, such as a square sealing ring.

[0068] like Figure 4 As shown, the forward filtering mode executed by the control unit 140 is executed in a state where the first switch valve 131a of the first and second switch valves of the first sealing part 130a is opened and the second switch valve 132a is closed on the contrary, and the third switch valve 133a of the third and fourth switch valves of the second sealing part 130b is closed and the fourth switch valve 134a is opened on the contrary.

[0069] In this state, if raw water is forced to flow in by supplying it through the first inlet and outlet 131 opened by the first switch valve, the raw water forms a forward fluid flow from one end of the separation membrane module 120 corresponding to the first sealing part to the other end of the separation membrane module 120 corresponding to the second sealing part while being filtered and processed. Therefore, concentrated water in the raw water that is filtered and processed while passing through the filter plate of the separation membrane module 120 in the forward direction is discharged to the outside through the fourth inlet and outlet 134 opened by the fourth switch valve, and the clean water as the produced water flows into the inlet hole 122 of the water pipe 121, and is then discharged to the outside through the discharge port 135 connected to the water pipe.

[0070] Here, if clean water as output water is produced during a predetermined time period by running this forward filtration mode that forms a forward fluid flow of raw water, the contamination of the separation membrane module is concentrated on one side, namely, the concentrated water discharge side, and therefore the reverse filtration mode is repeatedly performed more than once, with the set time of a preset timer or the measurement value of a flow meter that measures the discharge amount of clean water discharged through the discharge port being based on changing the flow direction of the raw water flowing into the interior of the separation membrane module to the reverse direction.

[0071] like Figure 5 As shown, the reverse filtering mode operated by the control unit 140 is executed in a state where the first switch valve 131a opened in the first and second switch valves of the first sealing part 130a is switched to a closed state and the second switch valve 132a closed in contrast is switched to an open state through a control signal of the control unit, and the third switch valve 133a closed in the third and fourth switch valves of the second sealing part is switched to an open state and the fourth switch valve 134a opened in contrast is switched to a closed state.

[0072] In this state, if raw water is supplied through the third inlet and outlet 133 opened by the third switch valve and flows in, the raw water forms a reverse fluid flow from the other end of the separation membrane module 120 corresponding to the second sealing part 130b to one end of the separation membrane module corresponding to the first sealing part 130a while being filtered and processed. Therefore, concentrated water in the raw water that is filtered and processed while passing through the separation membrane module in reverse is discharged to the outside through the second inlet and outlet opened by the second switch valve, and clean water as produced water flows into the inlet hole of the water pipe and is discharged to the outside through the discharge port connected to the water pipe.

[0073] Accordingly, by cross-controlling the forward filtration mode and the reverse filtration mode through the control unit, the raw water that is filtered and treated at the same time flows in through the separation membrane module as the core component arranged in the filtration structure in a non-unidirectional and bidirectional cross-use, and thus the contamination of the separation membrane module that is concentrated and started in the discharge direction of the concentrated water can be dispersed to both sides, the entire filtration area of ​​the separation membrane module can be used evenly, and the effect of delaying the contamination phenomenon that is accelerated after the separation membrane module is contaminated can be given, thereby extending the service life of the filtration structure.

[0074] On the other hand, the raw water filtration treatment using the separation membrane module of the filtration structure may vary depending on the usage time of the water purifier, that is, the actual filtration operation time or water flow rate, and the permeability performance of the separation membrane module itself, but it is preferred to change the raw water flow direction at intervals of 4 to 12 hours to perform the filtration operation, thereby delaying the contamination of the separation membrane module and extending the service life of the filtration structure.

[0075] At this time, when the operation time interval is less than 4 hours or more than 12 hours, the effect of bidirectional cross-operation raw water filtration is reduced, and the effect of delaying the pollution of the separation membrane module can be reduced.

[0076] That is, the filtration structure 100 of the preferred embodiment of the present invention is to change the structure to control the raw water flow direction in a bidirectional and non-unidirectional manner, thereby delaying the contamination phenomenon in the separation membrane module, thereby having an excellent effect of extending the service life of the filtration structure. At this time, the service life of the filtration structure can be relatively compared by the degree of reduction in water permeability due to contamination over the operating time, and the degree of contamination on the surface can also be compared by visually confirming the actual use of the separation membrane module after separating it from the shell and disassembling it.

[0077] (Example 1)

[0078] The first and second isolation seals 123 and 124 were attached to both sides of the outer surface of the 1812 size household separation membrane module 120, and then installed in the evaluation container. In order to prevent contamination during the filtration treatment of the separation membrane module, 250ppm of calcium chloride, 160ppm of sodium bicarbonate, and 90ppm of sodium chloride were used as raw water as scale components of foreign matter, and the operation was carried out at 80psi, 25℃, and a recovery rate of 60% to 65%. At this time, the forward filtration mode in which the raw water flows forward and the reverse filtration mode in which the raw water flows reversely were changed at intervals of 1 hour, and the water permeability was measured as the operation time passed. The results are shown in Table 1.

[0079] (Example 2)

[0080] Evaluation was carried out in the same manner as in Example 1, except that the forward filtration mode and the reverse filtration mode were operated at intervals of 2 hours.

[0081] (Example 3)

[0082] Evaluation was carried out in the same manner as in Example 1 except that the forward filtration mode and the reverse filtration mode in which raw water was fed were operated at intervals of 4 hours.

[0083] (Example 4)

[0084] Evaluation was carried out in the same manner as in Example 1, except that the forward filtration mode and the reverse filtration mode in which raw water was fed were operated at intervals of 8 hours.

[0085] (Example 5)

[0086] Evaluation was carried out in the same manner as in Example 1 except that the forward filtration mode and the reverse filtration mode in which raw water was fed were operated at intervals of 12 hours.

[0087] (Example 6)

[0088] Evaluation was carried out in the same manner as in Example 1 except that the forward filtration mode and the reverse filtration mode in which raw water was fed were operated at intervals of 14 hours.

[0089] (Comparative Example 1)

[0090] The evaluation was carried out in the same manner as in Example 1 except that the direction of raw water flow was not changed and the system was operated unidirectionally in the forward filtration mode in the same direction as a normal water purifier system.

[0091] (Table 1)

[0092]

[0093] As described in Table 1 and Figure 6 As shown, it can be seen that compared with Comparative Example 1 in which raw water was introduced only in a unidirectional forward filtration mode, the flow rate in Examples 1 to 6 was relatively reduced after the filtration operation was performed for about 3000 minutes.

[0094] In particular, different effects were produced depending on the time of crossing the raw water flow direction in the forward filtration mode and the reverse filtration mode, and it was confirmed that the flow rate reduction rate was further reduced when the cross operation was performed for more than 4 hours.

[0095] This is because the flow direction of raw water changes from forward to reverse, which alleviates the membrane fouling phenomenon caused by the concentrated water being concentrated on only one side of the separation membrane module. Since the flow reduction rate is reduced, the service life of the separation membrane filtration structure can be extended accordingly, thereby delaying the replacement period of the filtration structure.

[0096] In Comparative Example 1, the produced water flow rate was reduced by about 36% after about 3000 minutes of filtration operation. On the contrary, in Example 4, the flow rate was reduced by about 25% under the same operation time conditions, so it can be seen that the flow reduction rate differed by 10%.

[0097] In addition, compared with the comparative example, Example 6, which cross-operates the filtration in units of 14 hours, has a relatively excellent effect, but compared with Example 5, the effect is slightly reduced. Therefore, it can be seen that it is important to set an appropriate cross-operation time according to the performance of the separation membrane module itself and the operating conditions.

[0098] In addition, if Figure 7 (a) and Figure 7 As shown in (b), the separation membrane module was removed from the housing after the performance evaluation, and the surface contamination degree of the filter sheet as the comparative separation membrane was compared.

[0099] As in Comparative Example 1 Figure 7 As shown in (a), it is confirmed that the pollutants are accumulated centered in the concentrated water direction. On the contrary, Example 4, which has the lowest flow rate reduction rate, Figure 7 (b) shows that the surface contaminants are accumulated at a level that cannot be seen with the naked eye.

[0100] This is the same tendency as the difference in flow rate reduction rate according to the degree of fouling, and is a result that proves the effect of reducing fouling of the membrane module by the crossover operation between the forward filtration mode and the reverse filtration mode.

[0101] The embodiment described is the result of an evaluation conducted under raw water conditions in which a large amount of scale components are mixed to accelerate the contamination of the separation membrane module in order to confirm the effect of cross-operation in a short period of time. Under ordinary water purifier system usage conditions, that is, when tap water is used as raw water and a pretreatment filter is used, the effect of reducing the contamination of the separation membrane module and extending its life can be maximized.

[0102] If the filter structure of the present invention is used in a water purifier system while changing the direction of the raw water flowing in at a predetermined time period, the contamination of the separation membrane module, which is a core component, can be reduced, the service life of the filter structure can be extended, and it is also very practical as a filter structure for a water purifier system.

[0103] The present invention described above is not limited to the above-mentioned embodiments and drawings, and various substitutions, deformations and changes can be made without departing from the technical idea of ​​the present invention. This is obvious to technicians with common knowledge in the technical field to which the present invention belongs.

Claims

1. A filtering structure with a selective two-end water collection function, comprising a housing and a separation membrane module, filtering and processing raw water passing through the separation membrane module into clean water and concentrated water, at least one side end of the housing is open, the separation membrane module is arranged inside the housing and is formed by winding at least one filter sheet on the outer surface of a water pipe having at least one inlet hole formed therethrough, characterized in that: include: A first sealing portion having a first inlet and a second inlet and sealing one end of the housing, wherein the first inlet and the second inlet are selectively opened and closed by a first opening and closing valve, and the second inlet and the second inlet are selectively opened and closed by a second opening and closing valve; The second sealing part has a discharge port and a third inlet and a fourth inlet and a seals the other end of the housing, the discharge port is connected to an open end of one side of the water pipe, the third inlet and the fourth inlet are selectively opened and closed by a third switch valve, and the fourth inlet and the fourth inlet are selectively opened and closed by a fourth switch valve; and a control unit, controlling the on / off operation of the first and second switch valves and the on / off operation of the third and fourth switch valves, and controlling the supply of raw water through any one of the first and second inlets and outlets or controlling the supply of raw water through any one of the third and fourth inlets and outlets to form a forward fluid flow from the first sealing portion to the second sealing portion side or to form a reverse fluid flow from the second sealing portion to the first sealing portion side; and a sealing portion for separating raw water supplied to pass through the separation membrane module and concentrated water discharged from the separation membrane module to prevent mutual mixing, The sealing part includes: a first isolating seal, which is arranged on an outer surface of one side end of the separation membrane module corresponding to the first sealing part, so that the outer end contacts the inner surface of the housing; and a second isolating seal member disposed on the outer surface of the other side end of the separation membrane module corresponding to the second seal portion so that the outer end contacts the inner surface of the housing, The control unit is electrically connected to a flow meter, and the flow meter measures the discharge amount of the clean water discharged to the outside through the discharge port in real time, and controls the switching operation of the first and second switch valves according to the operation signal based on the change value of the clean water discharge amount measured by the flow meter to selectively open any one of the first and second inlets and outlets, and controls the switching operation of the third and fourth switch valves to selectively open any one of the third and fourth inlets and outlets, The discharge port is connected to an open end of one side of the water pipe, and the water pipe is sealed at one end corresponding to the first sealing portion.

2. The filtering structure with selective water collection function at both ends according to claim 1, characterized in that: The control unit controls the forward filtering mode and the reverse filtering mode to be repeatedly performed at least once at a predetermined interval, wherein the forward filtering mode is that the raw water flowing in through the selectively opened inlet and outlet of the first and second inlets of the first sealing part forms a forward fluid flow from the first sealing part to the second sealing part side while being filtered, the concentrated water is discharged to the outside through the selectively opened inlet and outlet of the third and fourth inlets of the second sealing part, and the clean water is discharged to the outside through the discharge port; The reverse filtering mode is that the raw water flowing in through the selectively opened inlet and outlet among the third and fourth inlet and outlet of the second sealing part forms a reverse fluid flow from the second sealing part to the first sealing part side and is filtered at the same time, the concentrated water is discharged to the outside through the selectively opened inlet and outlet among the first and second inlet and outlet of the first sealing part, and the clean water is discharged to the outside through the discharge port.

3. The filtering structure with selective water collection function at both ends according to claim 1, characterized in that: The control unit is electrically connected to a timer, and the timer generates an operation signal according to a preset time. The operation signal of the timer controls the switching operation of the first and second switch valves to selectively open any one of the first and second entrances and exits, and controls the switching operation of the third and fourth switch valves to selectively open any one of the third and fourth entrances and exits.

4. The filtering structure with selective water collection function at both ends according to claim 2, characterized in that: The control unit controls the forward filtering mode and the reverse filtering mode to cross-operate filtering at intervals of 4 to 12 hours.

5. A filtering method using a filtering structure with a selective two-end water collection function, comprising a filtering structure, the filtering structure comprising a housing and a separation membrane module, filtering and processing raw water passing through the separation membrane module into clean water and concentrated water, at least one side end of the housing is open, the separation membrane module is arranged inside the housing and is formed by winding at least one filter sheet on the outer surface of a water pipe that penetrates to form at least one inlet hole, characterized in that: The filtering structure comprises: A first sealing portion having a first inlet and a second inlet and sealing one end of the housing, wherein the first inlet and the second inlet are selectively opened and closed by a first opening and closing valve, and the second inlet and the second inlet are selectively opened and closed by a second opening and closing valve; A second sealing portion has a discharge port and a third and fourth inlet and outlet, and seals the other end of the housing, the discharge port is connected to an open end of one side of the water pipe, the third inlet and outlet is selectively opened and closed by a third on-off valve, and the fourth inlet and outlet is selectively opened and closed by a fourth on-off valve; and A control unit, controlling the on / off operation of the first and second switch valves and controlling the on / off operation of the third and fourth switch valves; and a sealing portion that separates raw water supplied to pass through the separation membrane module and concentrated water discharged from the separation membrane module to prevent mutual mixing; The sealing part includes: a first isolating seal, which is arranged on the outer surface of one side end of the separation membrane module corresponding to the first isolating seal, so that the outer end contacts the inner surface of the shell; and a second isolating seal, which is arranged on the outer surface of the other side end of the separation membrane module corresponding to the second isolating seal, so that the outer end contacts the inner surface of the shell; The filtering method comprises: In a forward filtration mode step, raw water flowing in through the selectively opened inlet and outlet of the first and second inlets of the first sealing part is filtered by the separation membrane module while forming a forward fluid flow from the first sealing part to the second sealing part side through the control part, concentrated water is discharged to the outside through the selectively opened inlet and outlet of the third and fourth inlets of the second sealing part through the control part, and clean water is discharged to the outside through the discharge port; a reverse filtration mode step, wherein raw water flowing in through the selectively opened inlet and outlet among the third and fourth inlets and outlets of the second sealing part is filtered by the separation membrane module while forming a reverse fluid flow from the second sealing part to the first sealing part side through the control part, and concentrated water is discharged to the outside through the selectively opened inlet and outlet among the first and second inlets and outlets of the first sealing part through the control part, and clean water is discharged to the outside through the discharge port; The control unit repeatedly executes the forward filtering mode step and the reverse filtering mode step at a predetermined interval for more than one time. The cross-operation filtering between the forward filtering mode step and the reverse filtering mode step is performed by an operation signal based on a change value of the clean water discharge amount measured by a flow meter, and the flow meter measures the discharge amount of the clean water discharged to the outside through the discharge port in real time, Between the forward filtering mode step and the reverse filtering mode step, the clean water is discharged to the outside through the discharge port, the discharge port is connected to an open end of one side of the water pipe, and the water pipe is sealed at one end corresponding to the first sealing part.

6. The filtering method using the filtering structure with selective water collection function at both ends according to claim 5, characterized in that: The forward filtering mode step and the reverse filtering mode step are cross-operated and filtered by an operation signal of a timer, and the timer generates an operation signal according to a preset time.

7. The filtering method using the filtering structure with selective water collection function at both ends according to claim 5, characterized in that: The crossover operation time interval between the forward filtration mode step and the reverse filtration mode step is 4 hours to 12 hours.

8. A water purifier system comprising the filter structure according to any one of claims 1 to 4.

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