KR100981135B1 - Water purifying apparatus using a hollow fiber membrane module - Google Patents

Abstract

PURPOSE: An apparatus for purifying water using a hollow fiber membrane is provided to enhance backwashing effect by simultaneously backwashing several filter units and to enable a user to easily confirm the damages to the hollow fiber membrane through a transparent widow. CONSTITUTION: An apparatus for purifying water: first and second filter units(10,20) including first and second tubular elements(11,21) with a plurality of hollow fiber membranes(50); first and second drain lines(13,23) having one ends which are connected to the upper ends of first and second external rooms; a main drain line(D); first and second supply lines(15,25); a main supply line(F); and a purification line(W). The upper end of a filtered water chamber(105) of the purification line is connected to a pneumatic source(106) for supplying compressed air.

Description

Water Purification System using Hollow Fiber Membrane {WATER PURIFYING APPARATUS USING A HOLLOW FIBER MEMBRANE MODULE}

The present invention relates to a water treatment apparatus using a hollow fiber membrane, and more particularly, to a water treatment apparatus capable of backwashing a hollow fiber membrane.

Water purification equipment using hollow fiber membranes has been applied to water treatment, wastewater treatment. Here, the hollow fiber membrane is a membrane capable of separating the suspended solids having a pore size of about 10 ~ 10,000Å, high molecular weight material is not permeable, water, ions, low molecular weight material permeate only the specific material It concentrates and purifies.

In recent years, water purification equipment using the hollow fiber membranes has been applied to clean and drink various waters due to lack of water, or to treat and reuse wastewater, so that the purified water treatment apparatus using the hollow fiber membranes has an application field and market scale. Is getting quite large.

Water purification apparatus using such a hollow fiber membrane has an advantage in that it can be used to maintain the performance for a long time because backwashing is possible.

1 is a view illustrating a water treatment apparatus using a conventional sand yarn separator.

In the water treatment apparatus shown in FIG. 1, the first and second tubular portions 11 and 21 in which a plurality of hollow fiber separators 50 are standing and embedded are disposed, and the upper hollow portion of the hollow fiber separators 50 and the circulation. First and second upper caps TC1 and TC2 closing the upper ends of the first and second tubular portions 11 and 21 in a state where the first and second upper chambers TR1 and TR2 are provided. First and second lower ends of the first and second tubular portions 11 and 21 in a state where the first and second lower chambers BR1 and BR2 are disposed to flow with the lower hollow portion of the hollow fiber membrane 50. First and second filter parts 10 and 20 including second lower caps BC1 and BC2; First and second drain lines (13, 23) having one end connected to the first and second upper chambers (TR1, TR2) and interposing first and second drain valves (12, 22); A main drain line (D) having one end connected to the other ends of the first and second drain lines (13, 23) and the other end being in circulation with the outside; First and second supply lines 15 and 25 having one end connected to the first and second lower chambers BR1 and BR2 and interposing first and second supply valves 14 and 24 on the way; A main supply line (F) having one end connected to the other ends of the first and second supply lines (15, 25) and the other end connected to a discharge port of a raw water feed pump (not shown); And outer chambers R1 and R2 partitioned by the outer circumferential surface of the hollow fiber separator 50 and the inner circumferential surfaces of the first and second tubular portions 11 and 21 so as not to pass through the hollow portion of the hollow fiber separator 50. ) Is connected to the upstream side via the first and second branch lines 16 and 26, and includes a water purification line W having a water purification valve V interposed on the downstream side.

Here, the first and second outer chambers R1 and R2 are not shown with respect to the first and second upper chambers TR1 and TR2 and the first and second lower chambers BR1 and BR2. It is applied to both ends of the plurality of hollow fiber separation membranes and is not blocked for distribution by a module adhesive part (not shown) which maintains the posture of the plurality of hollow fiber separation membranes.

The conventional water treatment apparatus having such a configuration operates as follows.

1. Water purification step (see Fig. 1)

The feed pump is operated by opening the first and second supply valves 14 and 24, opening the purified water valve V, and closing the first and second drain valves 12 and 22. Raw water is introduced into the hollow portion of the hollow fiber separation membrane 50 embedded in the first and second tubular portions 11 and 12 via the first and second lower chambers BR1 and BR2 and is generated in the feed pump. The raw water introduced into the outer chambers R1 and R2 outside the hollow part in the hollow part of the hollow fiber separation membrane 50 is filtered to allow the filtered raw water to be discharged through the water purification line W.

2. The water washing step of the hollow fiber membrane of the first tubular part (see FIG. 2)

With the first supply valve 14 and the first drain valve 12 open and all other valves closed, the feed pump is operated so that external raw water is embedded in the first tubular portion 11. 50) flows into the hollow part of the hollow part so that the introduced raw water is discharged through the main drain line D while washing the foreign matter stuck in the hollow part while passing the hollow part as it is by the pressure generated by the feed pump. .

3. Washing step for hollow fiber membrane washing of the second tubular part (see Fig. 3)

With the second supply valve 24 and the second drain valve 22 opened and all the remaining valves closed, the feed pump is operated so that external raw water is embedded in the second tubular portion 21. 50) flows into the hollow part of the hollow part so that the introduced raw water is discharged through the main drain line D while washing the foreign matter stuck in the hollow part while passing the hollow part as it is by the pressure generated by the feed pump. .

4. Backwashing step of hollow fiber membrane of first tubular part (see Fig. 4)

With the second supply valve 24 and the first drain valve 12 opened and all the remaining valves closed, the feed pump is operated to extract external raw water into the hollow fiber separation membrane embedded in the second tubular portion 21. 50) flows through the hollow portion of the hollow fiber membrane embedded in the second tubular portion 21 by the pressure generated in the feed pump to the second outer chamber (R2), and then filtered through The raw water to the outside of the hollow fiber separator embedded in the first tubular portion 11 via the second branch line 26, the water purification line W, the first branch line 16, and the first outer chamber R1. The hollow fiber membranes are filtered and filtered through, and are then discharged through the main drain line (D) via the first upper chamber (TR1) and the first drain line (13).

5. Backwashing step of hollow fiber membrane of the second tubular part (refer to FIG. 5)

With the first supply valve 14 and the second drain valve 22 opened and all the remaining valves closed, the feed pump is operated to extract external raw water into the hollow fiber separation membrane (1). 50) flows into the hollow portion of the hollow pipe of the hollow fiber membrane embedded in the first tubular portion 11 by the pressure generated in the feed pump to be filtered through the first outer chamber (R1), and then filtered through The raw water separated from the hollow fiber separator embedded in the second tubular portion 21 via the first branch line 16, the water purification line W, the second branch line 26, and the second outer chamber R2. After filtration permeation through the back of the hollow fiber membrane, the hollow fiber membrane is backwashed and discharged through the main drain line D via the second upper chamber TR2 and the second drain line 23.

However, since the conventional water treatment apparatus backwashes with the permeate water passed through the other adjacent filter part at the time of backwashing with respect to one filter part, the backwashing water, pressure, and flow rate for backwashing are insufficient, so that one filter part properly It has a first problem that it cannot backwash.

In addition, the conventional water treatment apparatus has a second problem that it has a structure that can be known only by disassembly whether the hollow fiber membrane is damaged.

The present invention has its problems in solving the above-mentioned problems.

The present invention provides a filtrate chamber for storing filtrate water during a water purification line, connected to a pneumatic source for supplying compressed air to the filtrate chamber, and interposing a check valve in the middle of a pneumatic line for distributing the pneumatic source and the filtrate chamber to each other. By doing so, the first problem can be solved.

In addition, the present invention can solve the second problem by interposing a transparent window in the middle of the drain line.

The present invention may further include a disinfectant supply line having one end connected to a water purification line through which the filter unit and the filtrate chamber are distributed to each other, a check valve interposed, and the other end connected to a disinfectant supply source.

According to the above-described problem solving means, a plurality of filter portions are backwashed at the same time by purified water that can be filtered and drinked without backwashing with another filter portion adjacent to the other filter portion at the time of backwashing with one filter portion. It is possible to increase the backwashing effect than before.

In addition, in the present invention, when the pressure source of backwash is pneumatic and the hollow fiber membrane is damaged, air flows into the drain line through the middle-saft separator at the time of backwash, and the air is confirmed as bubbles by the transparent window. It is possible to easily determine whether the hollow fiber membrane is damaged.

In addition, the present invention makes it possible to backwash the hollow fiber membranes by mixing a disinfectant with purified water purified by the hollow fiber membranes at the time of backwashing, so that the secondary fiber of the hollow fiber membranes at the time of backwashing may contain microorganisms. It can provide an effect to prevent contamination.

1 to 5 is a conceptual diagram of a conventional water treatment apparatus, and
6 to 8 are conceptual views of the water treatment apparatus of this embodiment.

Hereinafter, an embodiment according to the present invention will be described with reference to FIGS. 6 to 8. In describing the present embodiment, the same components as those of the conventional water treatment apparatus have been given the same reference numerals in order to assist in the easy understanding of the present embodiment.

In FIG. 6, the water treatment apparatus using the hollow fiber membrane of the present embodiment is indicated by the reference numeral 100.

The water treatment device 100 is circulated with the first and second tubular portions 11 and 21 in which a plurality of hollow fiber separators 50 are standing and embedded, and an upper hollow part of the hollow fiber separators 50. First and second upper caps (TC1, TC2) for closing the upper end of the first and second tubular portion (11, 21) in a state in which the first and second upper chambers (TR1, TR2) are provided First and second filter units 10 and 20; First and second outer chambers defined by the outer circumferential surface of the hollow fiber separator 50 and the inner circumferential surfaces of the first and second tubular portions 11 and 21 so as not to flow with the hollow portion of the hollow fiber separator 50. First and second drain lines 13 and 23 having one end connected to an upper end of each of R1 and R2; The upstream side is connected to the other end of the said 1st and 2nd drain lines 13 and 23, the drain valve 102 and the transparent window 101 are interposed in the middle, and the main drain which the downstream end distribute | circulates to the outside. Line D; First and second supply lines 15 and 25 having one end connected to lower ends of the first and second outer chambers R1 and R2; A main supply line having a downstream side connected to the other ends of the first and second supply lines 15 and 25, with a supply valve 103 interposed therebetween, and an upstream end connected to a discharge port of a raw water feed pump (not shown). (F); And an upstream side is connected to the first and second upper chambers TR1 and TR2 via first and second branch lines 16 and 26, and the first and second filter units 10, And a purified water line (W) interposed between the filtered water chamber (105) for temporarily storing purified water filtered by 20) and purified water valve (V).

An upper end of the filtrate chamber 105 is connected to a pneumatic source 106, such as an air compressor for supplying compressed air, and a pneumatic line 107 for distributing the pneumatic source 106 and the filtrate chamber 105 to each other. ), A check valve 108 is interposed.

One end of the purified water treatment device 100 is connected to a water purification line W through which the filter units 10 and 20 and the filtered water chamber 105 flow through each other, and a check valve 109 is interposed, and the other end thereof is connected to the purified water treatment apparatus 100. It further includes a disinfectant supply line 110 is connected to the disinfectant supply source 111.

The first and second outer chambers R1 and R2 are applied to both ends of a plurality of hollow fiber separation membranes, which are not shown with respect to the first and second upper chambers TR1 and TR2, as in the related art. It is blocked from flow by the module adhesive part which is not shown which maintains the attitude | position of a hollow fiber membrane.

The purified water treatment apparatus of this embodiment configured as described above operates as follows.

1. Water purification step (see Fig. 6)

The feed pump is operated while the supply valve 103 is opened, the purified water valve V is opened, and the drain valve 102 is closed, and external raw water is supplied to the first and second outer chambers R1 and R2. Inflow to the lower end of the feed pump, the raw water introduced from the hollow portion of the hollow fiber membrane to the hollow portion by the pressure generated in the feed pump, and the filtered raw water is filtered through the hollow water Filtration chamber 105 through the water purification line W via the hollow portion of the yarn separation membrane 50, the first and second upper chambers TR1 and TR2, and the first and second branch lines 16 and 26. After temporarily storing the filtered water in the filtrate chamber 105 at a predetermined level or more, the filtered raw water is discharged to the outside through the downstream end of the purified water line (W).

2. Washing step of hollow fiber membrane washing in the first and second tubular part (see Fig. 7)

With the supply valve 103 and the drain valve 102 open and the purified water valve V closed, the feed pump is operated to remove external raw water via the first and second supply lines 15 and 25. By flowing into the lower ends of the first and second outer chambers (R1, R2), the introduced raw water flows from the lower end of the first and second outer chambers (R1, R2) to the upper end as it is by the pressure generated in the feed pump While washing the foreign matter attached to the outer surface of the hollow fiber membrane 50, the first and second upper chamber (TR1, TR2), the first and second drain lines (13, 23) and the main drain line (D) It is discharged to the outside through.

3. Backwashing step of hollow fiber membrane of first and second tubular part (see Fig. 8)

With the drain valve 102 open and all the remaining valves closed, the pneumatic source 106, which is an air compressor, is operated to pass the compressed air via the pneumatic line 107 with the check valve 108 interposed therebetween. 105 supplied to the filtrate chamber 105 to pass the purified water stored in the filtrate chamber 105 via the first and second separation lines 16 and 26 via the upstream side W of the purified water line. TR1 and TR2, but the disinfectant supply source 111 is operated to inject the disinfectant into the water purification line W via the disinfectant supply line 110 through which the check valve 109 is interposed. The purified water and the disinfectant flowing in the inside) are mixed, and they are introduced together into the first and second upper chambers TR1 and TR2.

The purified water introduced into the first and second upper chambers TR1 and TR2 is hollow fiber separator 50 embedded in the first and second tubular portions 11 and 21 by the pressure formed by the pneumatic source 106. Permeate outward in the hollow part of the hollow fiber membrane and flow into the hollow part of the hollow fiber membrane to perform backwashing on the hollow fiber membrane, and then pass through the hollow fiber membrane to penetrate the first and second outer chambers (R1, R2). And discharge through the main drain line D via the first and second drain lines 13 and 23.

When the backwashing water that has undergone backwashing is discharged to the outside via the main drainline D, whether or not bubbles exist in the backwashing water through the transparent window 101 interposed in the middle of the main drainline D. You will be checked.

The presence of air bubbles in the backwash water means that the air of the pneumatic source used as the pressure during backwash has permeated through the hollow fiber membrane together with the purified water (backwash water). This means that the membrane is damaged and cannot function, indicating that the hollow fiber membrane must be replaced.

In the description of the present embodiment, the water treatment apparatus is described as having two filter units, but even if one water filter unit or three or more filter units are provided, the operation of the present embodiment can be performed in the same manner. It is self-evident to.

In the description of the present embodiment, in the membrane filtration method of the water treatment apparatus, a dead-end method of an out-in flow that transmits a water treatment object from the hollow fiber membrane into the hollow fiber membrane is applied. Although it is described as being, it is possible to apply a dead-end method of the in-out (in-out) flow to pass the purified water treatment object out of the hollow fiber membrane in the hollow fiber membrane.

However, in the separation membrane filtration method, the dead end method of the in-out flow in terms of turbidity contained in the raw water to be purified water rapidly contaminates the inner peripheral surface of the membrane to shorten the backwash cycle and chemical cleaning cycle, It is not preferable to the dead end method of in-flow.

In this embodiment, both ends of the main drain line D are connected to the main drain line D in a flowable manner with the drain valve 102 interposed therebetween, and the on / off valve on the way (shown in FIGS. 6 to 8). It is preferable if a bypass line (only shown in Figs. 6 to 8) is provided which is interposed.

The reason is that the concentrated water containing debris remains on the inlet side of the main drain line D at the time of water purification, which may contaminate the separation membrane at the time of backwashing, so that the on / off valve is opened at the time of water purification. It is to reduce the contamination in the purified water treatment device by flowing a small amount of the concentrated water via the drain.

Further, in this embodiment, both ends are connected to the main supply line (F) so as to be circulated so as to sandwich the supply valve (103) of the main supply line (F) and the on / off valve (FIGS. 6 to 8) in the middle. It is preferable if a bypass line (shown only in FIGS. 6 to 8) is provided which is interposed therebetween.

The reason for this is that the concentrated water containing debris remains on the inlet side of the main supply line F during backwashing, which may contaminate the separator during water purification, so that the on / off valve is opened at the time of backwashing. It is to reduce the contamination in the purified water treatment device by flowing a small amount of the concentrated water via the drain.

10: first filter part, 11: first tubular part, 13: first drain line, 15: first supply line, 16: first branch line, 20: second filter part, 21: second tubular part, 23 : Second drain line, 25: second supply line, 26: second branch line, 50: hollow fiber membrane, 100: water treatment device, 101: transparent window, 102: drain valve, 103: supply valve, 105: filtration water Chamber, 106: pneumatic source, 107: pneumatic line, 108: check valve, 109: check valve, 110: disinfectant supply line, 111: disinfectant supply source D: main drain line, F: main supply line, R1: first outer chamber , R2: second outer chamber, TC1: first upper cap, TC2: second upper cap, TR1: first upper chamber, TR2: second upper chamber, V: water purification valve, W: water purification line,

Claims (6)

First and second tubular portions 11 and 21 in which a plurality of hollow fiber separators 50 are standing and embedded, and first and second upper chambers TR1 circulating with the upper hollow portion of the hollow fiber separator 50. , The first and second filter parts 10 including first and second upper caps TC1 and TC2 closing the upper ends of the first and second tubular parts 11 and 21 in a state where TR2 is provided. , 20);
First and second outer chambers defined by the outer circumferential surface of the hollow fiber separator 50 and the inner circumferential surfaces of the first and second tubular portions 11 and 21 so as not to flow with the hollow portion of the hollow fiber separator 50. First and second drain lines 13 and 23 having one end connected to an upper end of each of R1 and R2;
A main drain line (D) having an upstream side connected to the other ends of the first and second drain lines (13, 23), interposed with a drain valve (102), and having a downstream end flowing through the outside;
First and second supply lines 15 and 25 having one end connected to lower ends of the first and second outer chambers R1 and R2;
The main supply line F in which the downstream side is connected to the other end of the said 1st and 2nd supply lines 15 and 25, the supply valve 103 is interposed, and the upstream end is connected to the discharge port of a raw water feed pump. ; And
The upstream side is connected to the first and second upper chambers TR1 and TR2 via the first and second branch lines 16 and 26, and the first and second filter units 10 and 20 on the downstream side. A purified water chamber 105 for temporarily storing purified water filtered and filtered by)
An upper end of the filtrate chamber 105 is connected to a pneumatic source 106 for supplying compressed air, and a check valve in the middle of the pneumatic line 107 for allowing the pneumatic source 106 and the filtrate chamber 105 to flow to each other. (108) is interposed,
The purified water treatment device has one end connected to a water purification line (W) through which the filter units (10, 20) and the filtered water chamber (105) flow through each other, a check valve (109) is interposed, and the other end is a disinfectant supply source ( Water treatment apparatus using a hollow fiber membrane, characterized in that it further comprises a disinfectant supply line (110) connected to the 111. The method of claim 1,
Water purification apparatus using a hollow fiber membrane, characterized in that the transparent window 101 is interposed in the middle of the main drain line (D). delete A filter part including a tubular part in which a plurality of hollow fiber separators are built up, and an upper cap for closing an upper end of the tubular part in a state in which an upper chamber for distributing with an upper hollow part of the hollow fiber separator is provided;
One end is connected to the upper end of the outer chamber partitioned by the outer circumferential surface of the hollow fiber separator and the tubular part inner circumferential surface so as not to flow with the hollow portion of the hollow fiber separator, and the drain valve is interposed in the middle, and the other end is distributed to the outside. A drain line;
A supply line having one end connected to a lower end of the outer chamber;
A main supply line having a downstream side connected to the other end of the supply line, interposed with a supply valve, and an upstream end connected to a discharge port of the raw water feed pump; And
And a purified water line interposed between the upper chamber and a purified water chamber for temporarily storing purified water filtered by the filter unit on the downstream side of the upper chamber and a purified water valve.
An upper end of the filtrate chamber is connected to a pneumatic source for supplying compressed air, and a check valve is interposed in the middle of the pneumatic line for distributing the pneumatic source and the filtrate chamber to each other.
The water treatment apparatus further includes a disinfectant supply line having one end connected to a water purification line through which the filter unit and the filtrate chamber are distributed to each other, a check valve interposed therebetween, and the other end connected to a disinfectant supply source. Water treatment device using a hollow fiber membrane. The method of claim 4, wherein
Water purification apparatus using a hollow fiber membrane, characterized in that the transparent window is interposed in the middle of the main drain line. delete

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