WO2007122918A1

WO2007122918A1 - Water treatment apparatus

Info

Publication number: WO2007122918A1
Application number: PCT/JP2007/055170
Authority: WO
Inventors: Yuji Tanaka; Hiromitsu Kanamori
Original assignee: Toray Industries, Inc.
Priority date: 2006-03-27
Filing date: 2007-03-15
Publication date: 2007-11-01
Also published as: JPWO2007122918A1

Abstract

A water treatment apparatus that is of compact size to thereby reduce the setting area therefor, increasing the amount of water treated per area of filter medium and per time, and that enables stable operation for a prolonged period of time. There is provided a water treatment apparatus including a hermetically closed vessel with a raw water supply port and a treated water outlet; divider plate (6) with aperture (14) for dividing of the interior of the vessel into raw water chamber (20) with raw water supply port (8) and treated water chamber (19) with treated water outlet (9); tubular filter medium (4) being open at its one end and closed at the other end; and tubular body (5) consisting of a water permeable plane, inserted within the tubular filter medium. The open end of the tubular filter medium (4) is arranged so as to become liquid-tight with the aperture (14) of the divider plate. The tubular filter medium (4) consists of a napped knitted or woven fabric with superfine fiber nap, and the napped surface is positioned on the side of raw water.

Description

Specification

Water treatment equipment

Technical field

[0001] The present invention is effective for stably removing and purifying suspended substances contained in water bodies such as lakes, moats, rivers, irrigation ponds, dam lakes, domestic wastewater, and factory wastewater for a long period of time. More specifically, the present invention relates to a small water treatment apparatus capable of filtering raw water with a high flux.

Background art

[0002] As a water treatment apparatus for removing suspended substances contained in water bodies such as lakes, moats, rivers, irrigation ponds, dam lakes, domestic effluents, factory effluents, etc., as shown in Patent Document 1, for example, Type water treatment equipment. This device removes suspended solids with a filter cloth wound around the drum surface that allows water to pass through, and takes out the treated water from the intake pipe force disposed on the rotating shaft of the drum. As a result, there are problems such as high equipment costs and large equipment installation area. Patent Document 2 discloses a water treatment apparatus in which a filter cloth is attached around the drum and a solid-liquid separation apparatus in which the filter cloth is attached on a moving belt. This solid-liquid separator also has problems such as high equipment costs and large installation area due to its large size.

[0003] On the other hand, as a water treatment device in which the degree of accumulation of filter media is increased and the installation area of the device is reduced, for example, as shown in Patent Document 3, a hollow fiber membrane module containing a large number of hollow fiber membranes is used. The thing which arrange | positions several in a container and pressurizes and filters raw | natural water is mentioned. However, since this device uses a hollow fiber membrane with a small pore size on the filtration surface as a filter medium, for example, even fine suspended substances of 1 μm or less in raw water can be filtered, but on the unit area and unit time of the filter medium. There is a problem that the amount of water treated cannot be treated with a high flux of a few m ³ Zm ² Zday at most!

[0004] Further, the filtration device described in Patent Document 4 has a configuration in which a plurality of bag-shaped filter medium elements are installed in a container for filtration. However, when raw water is filtered with a high flux, the filtration device can be obtained in a short time. Suspended material accumulates on the surface of the filter element element, causing clogging, and filtering cannot be continued for a long time. There is a problem. Even if this filter element is washed by shower spraying or the like, it is difficult to continue stable filtration at a low differential pressure for a long period of time when the accumulated dirt is difficult to remove.

[0005] As these conventional water treatment devices, water treatment devices capable of filtering raw water with a high flux have been proposed, but there is a problem that the device is large and has a large installation area and high equipment costs. In addition, it is difficult to remove dirt deposited on the filter cloth, and stable water treatment cannot be performed for a long time. Therefore, there has been a demand for a water treatment device that is small in size and requires a small installation area, can increase the amount of treated water per unit area and unit time of the filter medium, and can stably operate for a long period of time.

Patent Document 1: Japanese Patent Laid-Open No. 51-119168

Patent Document 2: International Publication No. 97Z45188 Pamphlet

Patent Document 3: Japanese Patent Laid-Open No. 61-222509

Patent Document 4: JP-A-5-245312

Disclosure of the invention

Problems to be solved by the invention

[0006] The present invention provides a water treatment device that is small in size and requires a small installation area, can increase the amount of treated water per unit area and unit time of a filter medium, and can operate stably for a long period of time. For the purpose.

Means for solving the problem

In order to achieve the above object, the present invention has the following configuration.

(1) A sealed container having a raw water supply port and a treated water outlet, and an opening for partitioning the inside of the container into a raw water chamber having a raw water supply port and a treated water chamber having a treated water outlet A water treatment apparatus comprising: a partition plate having one end; a tubular filter medium having one end opened and the other end closed; and a tubular body having a surface force capable of passing water inserted into the tubular filter medium, An opening end of the cylindrical filter medium is disposed so as to be in a liquid-tight state with the opening of the partition plate, the cylindrical filter medium is composed of a napped knitted fabric having napped fibers, and has napped fibers. A water treatment device characterized in that the surface is located on the raw water side.

(2) The water treatment according to (1) above, further comprising cleaning fluid supply means for supplying a compressed gas or a compressed gas mixed fluid into the treated water chamber and Z or the raw water chamber. apparatus.

(3) The compressed fluid supply means provided with a flow path for supplying the compressed gas to the treated water chamber, or the flow path I for supplying the compressed gas to the treated water chamber and the compressed gas to the raw water chamber. The water treatment apparatus according to (2) above, wherein the compressed gas supply apparatus is provided with a flow path II to be supplied to

(4) The water treatment apparatus according to (1) above, wherein the single yarn diameter of the napped yarn in the napped knitted fabric constituting the cylindrical filter medium is 1.0 to LO / z m.

(5) The water treatment apparatus according to (1), wherein the length of the napped knitted fabric constituting the tubular filter medium is 2 to: LOmm.

[0008] (6) A ratio (AZB) of a cross-sectional area (A) of a cross-section of the tubular filter medium to a cross-sectional area (B) of a cross-section of the tubular body is 1.1 or more (1 ) Water treatment apparatus.

(7) One end of the tubular body inserted into the tubular filter medium is connected to the opening of the partition plate, and the entire water-permeable surface of the tubular body is covered with the tubular filter medium. The water treatment device according to (1) above.

(8) The water treatment device according to (1), wherein a plurality of the tubular filter media and the tubular body are arranged in the raw water chamber.

(9) The water treatment device according to (1), wherein the water treatment device is installed in the container so that the longitudinal direction of the tubular filter medium and the tubular body is horizontal.

(10) Connect the treated water outlet of the upstream water treatment device and the raw water supply port of the downstream water treatment device so that a plurality of the water treatment devices described in (1) above are arranged in series. A water treatment method comprising: supplying treated water from an upstream water treatment device to a downstream water treatment device and sequentially passing the water.

(11) When replacing the tubular filter medium in the water treatment device described in (8) above, the tubular filter medium and the tubular body must be attached to the partition plate and attached to and integrated with the partition plate for replacement. A method for replacing a tubular filter medium characterized by the above.

The invention's effect

[0009] By using the water treatment device of the present invention, a small-sized water treatment device, which can stably remove suspended substances of a number; zm to several tens; Furthermore, the unit of filter media Since the amount of treated water per area and unit time can be increased, a large amount of water can be treated at a high flow rate by a small device.

Brief Description of Drawings

FIG. 1 is a schematic longitudinal sectional view showing an embodiment of a water treatment apparatus according to the present invention.

FIG. 2 is a schematic longitudinal sectional view showing another embodiment of the water treatment apparatus according to the present invention.

FIG. 3 is a schematic longitudinal sectional view showing still another embodiment of the water treatment apparatus according to the present invention.

FIG. 4 is a schematic longitudinal sectional view showing still another embodiment of the water treatment apparatus according to the present invention.

FIG. 5 is an arrangement flow diagram illustrating a mode in which cleaning fluid supply means is arranged in the water treatment apparatus according to the present invention.

Explanation of symbols

[0011] 1: Water treatment device, 2: Lower part of sealed container (container body), 3: Upper part of sealed container

(Cover), 4: Tubular filter medium, 5: Tubular body, 6: Partition plate, 7: Suppressing plate, 8: Raw water supply port, 9: Outlet for treated water, 10: Outlet, 11: Saddle, 12 , 13: Sealing material, 14: Opening part, 15: Scrubbing pipe, 16: Air diffuser, 17: Air diffuser plate, 18: Fastening material, 19: Treated water chamber, 20: Raw water chamber, 21: Blower, 22: Air piping (channel 1), 23: Air piping (channel 11), 24: Treated water piping, 25: Raw water piping, 26, 27: On-off valve, 28, 29: Pump

BEST MODE FOR CARRYING OUT THE INVENTION

The best embodiment of the present invention will be described below with reference to the drawings, taking as an example a water treatment apparatus suitable for obtaining industrial water and the like by filtering lake water and river water at a high flow rate. To do.

1 and 2 are schematic longitudinal sectional views showing examples of the water treatment device according to the present invention. As shown in the figure, the inside of the sealed container is divided into two upper and lower chambers by the partition plate 6, the upper chamber is the treated water chamber 19, and the lower chamber is the raw water chamber 20. The container portion (container body 2) of the raw water chamber 20 is provided with a raw water supply port 8, and the container portion (lid portion 3) of the treated water chamber 19 is provided with a treated water outlet 9. The partition plate 6 has a plurality of openings, and each of the openings 14 is provided with an opening end of the tubular filter medium 4 so as to be in a liquid-tight state. The Here, in FIG. 1 and FIG. 2, the raw water supply port 8 and the treated water outlet 9 are respectively provided on the lower surface of the container body 2 and the upper surface of the lid part 3, but depending on the convenience of piping, etc. Even if it is provided on the side of the container body 2 and the side of the lid 3,

[0014] The tubular filter medium 4 has a tubular shape with one end opened and the other end closed, and is composed of a napped knitted fabric having napped fibers. In the illustrated apparatus, a tubular body 5 is inserted into the tubular filter medium 4. That is, the plurality of water-permeable cylindrical bodies 5 whose outer surfaces are covered with the filter medium by being covered with the cylindrical filter medium 4 are the opening end sides of the partition plate 6 having a plurality of openings. It is suspended from the opening 14 via the sealing material 12. Here, since the opening end of the cylindrical filter medium 4 is fixed to the upper end of the cylindrical body 5 by, for example, an adhesive or a binding band (not shown), the opening of the partition plate 6 and the cylindrical The open ends of the filter media 4 are connected in a liquid-tight state.

Further, the upper end portion of the cylindrical body 5 has a hook shape, and the hook portion 11 is hooked on the outer peripheral upper surface of the opening portion of the partition plate 6. In FIG. 1, the flange portion 11 is fixed by overlapping a holding plate 7 having substantially the same shape as the partition plate 6 on the flange portion 11. Thus, since the flange 11 at the upper end of the cylindrical body 5 is fixed, the cylindrical filter medium 4 and the cylindrical body 5 do not fall into the container body 2 even during water treatment, and It is not pushed up into the lid 3 by water pressure, etc., but is fixed to the cutting plate.

[0016] Furthermore, at the connecting portion between the container body 2 and the lid portion 3 having the treated water outlet 9, a cutting plate 6 and a holding plate 7 are sandwiched between the bolt (not shown) and the like. The container body 2 and the lid part 3 are coupled and fixed using a fastening material, between the lid part 3 and the holding plate 7, between the holding plate 7 and the partition plate 6, and further to the partition plate 6 and A sealing material 13 is disposed between the container body 2 and sealed.

[0017] Here, in order to prevent the cylindrical body 5 from falling into the container main body 2 or from being pushed up into the lid portion 2, for example, as shown in FIG. Even if the flange 11 is fixed to the partition plate 6 by using a fastening material 18 such as a bolt, it does not work.

[0018] The tubular filter medium 4 used in the present invention is constituted by a napped knitted fabric having napped fibers. Here, the tubular filter medium 4 is arranged so that the surface having napped fibers made of ultrafine fibers is located on the raw water side, and the napped portion exhibits the function of capturing suspended substances during filtration and immediately It functions as a filtration layer. Examples of the raised knitted fabric having such a filtration function include a knitted fabric having a bundle of ultrafine fibers raised on one surface. For example, a fabric made of ultrafine fibers is used for the weft and the surface is extremely fine. For example, such a napped knitted fabric in which napped fabrics in which fibers are napped is used has, for example, one end or a part of an ultrafine fiber bundle as a root portion integrally fixed to the base layer as a base layer having a fabric strength. The filter medium of the cloth that is present. Examples of the method for fixing the microfiber bundle and the base layer integrally include adhesive bonding, heat fusion, ultrasonic bonding, entanglement of the base layer yarn and fiber bundle, and combinations thereof. It is not limited to.

[0019] Moreover, as the ultrafine fiber exhibiting a filtration function in this napped knitted fabric, an ultrafine fiber made of a polymer material having a fiber forming function may be used. This high molecular weight material includes nylon 6, nylon 66, nylon 12, polyamide such as copolymer nylon, aromatic polyamide, polyethylene terephthalate, polyester such as copolymer polybutylene terephthalate, wholly aromatic polyester, polyethylene, polypropylene, etc. Polyolefins, polyurethanes, polyacrylonitriles, polychlorinated burs, polybulal alcohols, bully polymers, polysulbivinylidene, polyhydrosulfite, polyfluorinated styrene, copolymerized polyfluorinated ethylene, polyoxymethylene, and the like. In addition, combinations of fiber types such as core-sheath structures, multi-core-sheath structures, sea-island structures, bimetal structures, etc., in which a plurality of these polymer substances are combined may be used depending on the purpose.

[0020] The thickness (diameter) of the ultrafine fibers forming the napped fibers is preferably 10 m or less, which is relatively thin, but 0.1 to: LO / zm is more desirable to improve the capture performance of fine particles. In order to improve the capturing performance of the fine particles while maintaining high durability of the preferred fiber, 1.0 to 10; ζ ΐη is further preferable.

[0021] The length of the raised fibers of the ultrafine fibers forming the raised fibers is preferably 2 to: LOmm. This is because if the nap of the ultrafine fibers is too short, the capture performance of the fine particles deteriorates.If it is too long, the ultrafine fibers are entangled with each other, and the capture performance of the fine particles and the separation performance after capture are reduced. is there.

[0022] The tubular body 5 is inserted into the tubular filter medium 4 so that the tubular filter medium 4 made of napped knitted fabric can maintain a predetermined shape of the tubular shape even when water pressure is applied during filtration. It is It is composed of a surface force that allows water to pass, such as a crushed or perforated plate. This water-permeable surface may be made of a material or shape that is not substantially deformed by the water pressure during filtration. In addition, as a material constituting the container body 2, the lid 3, the partition plate 6, the holding plate 7, and the cylindrical body 5, in the case of resin, for example, polyolefin such as polyethylene, polypropylene, polybutene, or polytetrafluoroethylene. (PTFE), tetrafluoroethylene 'perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroethylene' hexafluoropropylene copolymer (FE P), tetrafluoroethylene 'ethylene Fluorine resin such as copolymer (ETFE), polychlorotrifluoroethylene (PCTFE), black trifluoroethylene 'ethylene copolymer (ECTFE), polyvinylidene fluoride (PVDF), and polychlorinated resin Chlorinated resins such as bulls and polyvinyl chlorides, polysulfone resins, polyethersulfone resins, polyarylsulfone resins, and polyethers Resin, acrylonitrile-butadiene-styrene copolymer resin (ABS), acrylonitrile-styrene copolymer resin, polyphenylene sulfide resin, polyamide resin, polycarbonate resin, polyether ketone resin, polyether ether ketone resin Single and mixtures thereof are used. In addition, other than rosin

Aluminum, stainless steel, and the like are used, and composite materials such as a resin-metal composite, glass fiber reinforced resin, and carbon fiber reinforced resin can be used. The container body 2, the lid 3, the partition plate 6, the holding plate 7, and the cylindrical body 5 may all be made of the same material, or a combination of members having different material forces may be used. .

[0023] Further, as the sealing material 12 between the cylindrical body and the partition plate and the sealing material 13 between the container body, the partition plate, the holding plate, and the lid portion, an O-ring or a sheet-like gasket is used. The cross-sectional shape may be a circle, an ellipse, a rectangle, a triangle, or the like. The materials are ethylene propylene rubber, -tolyl rubber, acrylic rubber, silicone rubber, fluorosilicone rubber, fluorine rubber, urethane rubber, chloroprene rubber, 4-fluoroethylene rubber, polyamide resin, polyethylene terephthalate resin, stainless steel, aluminum, etc. Can be mentioned

Next, the effect of the present invention will be described while describing a method for treating raw water by a total filtration method using the water treatment apparatus shown in FIG.

[0025] First, in the filtration step, raw water supplied from the raw water supply port 8 is a plurality of cylindrical bodies 5 The outside force of the tubular filter medium 4 attached to the inside also flows inward. At this time, suspended substances in the raw water are captured by the raised portions on the surface of the tubular filter medium 4, and only the treated water flows into the tubular filter medium 4 and the tubular body 5. The treated water that has flowed in flows upward through the inner part of the tubular filter medium 4, is collected inside the lid 3, and is taken out from the treated water outlet 9. At this time, since the outlet 10 is closed, the whole amount of raw water supplied from the raw water supply port 8 is filtered.

[0026] Here, in addition to the function of connecting the opening portion of the partition plate 6 and the opening portion of the cylindrical filter medium 4, the cylindrical body 5 has a flow path inside the cylindrical filter medium 4 closed by water pressure or the like. In order to prevent water from flowing into the inside of the tubular filter medium 4, it is formed with a surface that allows water to pass therethrough. Therefore, the cylindrical body 5 has a cylindrical peripheral surface formed from a porous material surface having openings, the bottom surface side is closed, and the upper surface side is open. If the above function is achieved, the higher the water flow performance, the smaller the pressure loss of the water treatment device 1 during raw water treatment. Preferably there is. For example, it is possible to use a cylindrical body made of a resin mesh-like plate, a cylindrical body made of a metal net, a cylindrical body made of a punching metal, or the like.

[0027] Next, when the filtration process for a certain period of time is completed, in order to clean the outer surface of the tubular filter medium 4, compressed gas or treated water mixed with the compressed gas is supplied from the treated water outlet 9 to the raw water side. Rubbing is performed by flowing back-pressure washing or by supplying compressed gas or raw water mixed with compressed gas from the supply port 8 and discharging suspended substances accumulated in the container body 2. At this time, the outlet 10 is opened. Here, the compressed gas used in scrubbing for back pressure cleaning is a pressurized and compressed gas, and the type of the gas is not particularly limited, but air, nitrogen, or the like may be used. As the supply of compressed gas, it is easy and preferable to send compressed air using a blower or a compressor.

[0028] A specific description will be given using the piping flow diagram of FIG. For example, the air piping from the blower 21 is branched halfway to form the air piping 22 of the flow channel I and the air piping 23 of the flow channel II, and the ends of the air pipings 22 and 23 are near the treated water outlet 9 To the treated water pipe 24 and the raw water pipe 25 near the raw water supply port 8 respectively. By opening and closing the on-off valves 26 and 27 installed in the middle of the air pipes 22 and 23, they are directed toward the treatment water chamber 19 and the Z or raw water chamber 20, respectively. Compressed air can be supplied. At this time, a flow meter and a pressure gauge (not shown) may be installed, and the amount of compressed air supplied may be adjusted by adjusting the opening of the on-off valves 26 and 27. At this time, the open / close valve of the treated water pipe 24 and the open / close valve of the raw water pipe 25 are in a closed state.

[0029] Next, when the compressed gas mixed fluid is supplied into the treated water chamber 19, the blower 21 is used to send the compressed air as described above, and at the same time, for example, the pump 28 is used to form a tank (see FIG. The treated water stored in (not shown) may flow toward the treated water outlet 9. Then, the treated water and the compressed air merge in the treated water pipe 24 near the treated water outlet 9, and are sent into the treated water chamber 19 as a compressed gas mixed fluid. In this case, it is preferable because the compressed gas is dispersed in the treated water and is uniformly sent by each cylindrical filter medium.

[0030] The same operation may be performed when the compressed gas mixed fluid is supplied into the raw water chamber 20. That is, the compressed air is sent using the blower 21, and at the same time, the raw water is flowed to the raw water supply port 8 by using the pump 29. Then, the raw water and the compressed air merge in the raw water pipe 25 near the raw water supply port 8 and are sent into the raw water chamber 20 as a compressed gas mixed fluid.

[0031] First, in the back pressure cleaning, the compressed gas or the treated water mixed with the compressed gas flows from the inside of the tubular filter medium 4 to the outside, so that it adheres to the outer surface of the tubular filter medium 4 and is suspended. The turbid material peels off the outer surface force of the filter medium or is easily peeled off. In the next scrubbing, the suspended substances float in water and are discharged together with water from the raw water supply port 8 in the drainage process. Here, back pressure cleaning and scrubbing can be performed simultaneously. In addition, when the treated water mixed with compressed gas is sent to the tubular filter medium 4 for back pressure cleaning, it adheres to the outer surface of the tubular filter medium 4, and the suspended substances are removed from the outer surface of the filter medium. Since it has the effect of floating in water at the same time as peeling, scrubbing is not necessarily required.

[0032] The pressure of the compressed gas supplied in the back pressure cleaning is determined according to the filter medium to be used.

In other words, in order for the compressed gas to penetrate through the internal force of the tubular filter medium 4 as well, the compressed gas must be supplied at a pressure higher than the bubble point of the filter cloth (puffed knitted fabric) used for the tubular filter medium. I must.

[0033] On the other hand, the flow rate of the treated water to be supplied per unit time is preferably about 1.5 to 3 times the flow rate of the treated water during filtration. If it is almost the same as the flow rate during filtration, On the contrary, the cleaning effect increases as the flow rate increases, but the amount of treated water finally obtained is reduced by the amount used for cleaning.

[0034] Next, the amount of compressed gas supplied during scrubbing is (Q), and the cross-sectional area of the container body 2 (the inner wall cross-sectional area in the cross section perpendicular to the longitudinal direction of the tubular filter medium 2) is (S) When, preferable if the value of (QZS) 0. 1LZ min ZCM ² or more.

In addition, in order to perform scrubbing more effectively, a gas outlet of the scrubbing pipe 15 is installed below each of the tubular filter media 4 as shown in FIG. 3, or as shown in FIG. It is also preferable to install a diffuser plate 17 having a diffuser port 16 below each tubular filter medium 4 below the tubular filter medium. In these cases, the compressed gas is intensively supplied in the vicinity of the cylindrical filter medium 4 in the container main body 2, so that effective cleaning, reduction of the flow rate of the compressed gas, and the like are possible.

[0036] Furthermore, in the present invention, the cylindrical filter medium 4 is constituted by a napped knitted fabric having naps of ultrafine fibers, so that suspended substances are trapped in the napped portions in the filtration step, and back pressure washing or scrubbing is performed. This is because the suspended matter trapped in the napping is easily peeled off by shaking the napping. Since the trapped suspended matter is peeled off and then discharged to the raw water side, the tubular filter medium 4 is arranged so that the surface having the napped fibers is located on the raw water side.

[0037] According to the present invention, when the area of the cross section of the tubular filter medium 4 is A and the area of the cross section of the tubular body 5 is B, the ratio (AZB) is 1.1 or more. Preferably there is. This is because the tubular filter medium 4 has a larger cross-sectional area than the cross-sectional area of the cylindrical body 5 and the suspended filter substance 4 is swayed or adhering to the outer surface immediately after scrubbing. This is because it is easy to peel off. The upper limit of the ratio of AZB is practically about 2.

[0038] The raw water is continuously treated for a long time while repeating the above steps.

[0039] Although the water treatment described above has been described for the case of V, the so-called total filtration method, in which all of the raw water is filtered, in the filtration step, a part of the raw water supplied from the raw water supply port 8 is used. A filtration method in which the liquid flows through the container body and is discharged from the outlet 10, and the remaining part flows into the cylindrical filter medium 4 attached to multiple cylindrical bodies 5 from the outside to the inside and is filtered. So-called cross-flow filtration may be used for water treatment.

[0040] Further, it is preferable that a plurality of tubular filter media 4 and tubular bodies 5 are arranged in the raw water chamber 20 of the water treatment apparatus. Compared to the cost of the cylindrical filter medium 4 and the cylindrical body 5, Because the cost is higher, it is possible to reduce the equipment cost by arranging as many cylindrical filter media 4 and cylindrical bodies 5 as possible in one container body 2 and increasing the filtration area. . At that time, it takes time to detach and attach the plurality of tubular filter media 4 and the tubular body 5 one by one in the container body 2 at the place where the water treatment device 1 is installed. It is preferable in terms of work efficiency that a plurality of cylindrical filter media 4 and a cylindrical body 5 are attached to the partition plate 6 so that the partition plate 6 and the plurality of cylindrical filter media 4 and the cylindrical body 5 can be attached and detached.

[0041] Furthermore, the water treatment apparatus of the present invention can be installed in a horizontal direction so that water flows in the horizontal direction in the apparatus. In this case, the tubular filter medium 4 and the tubular body 5 may be installed in the container body 2 so that the longitudinal directions thereof are horizontal. In this way, when the longitudinal direction of the cylindrical filter medium 4 and the cylindrical body 5 is installed horizontally in the container body 2, the lid 3 is opened and the cylindrical filter medium 4 and the cylindrical body are installed. When exchanging the body 5 etc., there is an advantage that it can work from the side. On the other hand, when the water treatment device is installed vertically and the longitudinal direction of the tubular filter medium 4 and the tubular body 5 is arranged vertically in the container body 2, the tubular filter medium 4 and the tubular body When detaching 5 to / from the container body 2, at least the space above the container body 2 is required for the height of the tubular filter medium 4 and the tubular body 5, so if installed in a building with a low ceiling, etc. There is a problem that it is difficult to remove the cylindrical filter medium 4 and the cylindrical body 5 in the installed state, and the lengths of the cylindrical filter medium 4 and the cylindrical body 5 are limited.

[0042] In the above description, the water treatment can be performed by connecting a plurality of water treatment devices in a force when water treatment is performed by one water treatment device. For example, when performing filtration with higher filtration accuracy or stable operation over a longer period of time, multiple water treatment devices are placed in series, and the treated water outlet and the downstream water treatment device are connected in series. It is preferable to perform water treatment by connecting the raw water supply port of the water treatment device and sequentially passing water from the upstream water treatment device to the downstream water treatment device. In particular, a plurality of water treatment devices, each containing filter media with different filtration accuracy, are arranged in series, and they are directed from the upstream side to the downstream side so as to increase the filtration accuracy of the filter media and to make the water Even more preferred to do the processing. In this case, the suspended matter in the raw water is trapped in stages depending on its size, so clogging of the filter medium can be reduced.

Example <Example 1>

A water treatment device with the structure shown in Fig. 1 is used except that the number of cylinders and tubular filter media is two, and the water treatment device is placed vertically using a total filtration system that does not discharge raw water from the outlet. Installed at and treated raw water.

[0044] As the filter medium constituting the cylindrical filter medium, a napped woven fabric having a filtration accuracy of 18 m and having napped polyester fibers (length: 2 to 4 mm) having a thickness of about 7 μm was used. The napped fabric was sewn into a tubular shape having a diameter of about 30 mm and a length of about 500 mm, with one end open and the other closed. This cylindrical filter medium was attached so as to cover the outer periphery of a cylindrical body having a diameter of about 25 mm, a length of about 500 mm, and a porosity of about 60%, which is also made of a resinous porous sheet. Here, the ratio of (AZB) when the cross-sectional area of the tubular filter medium is A and the cross-sectional area of the tubular body is B is 1.44. In addition, a resin molded product made of polysalt cellulose was used for the container body, the lid, the partition plate, and the tubular body. A water treatment apparatus having a structure in which two cylindrical filter media and a cylindrical body are housed in a sealed container. The cross-sectional area in the container body was 25 cm ² .

[0045] Next, Lake Biwa water with a turbidity of 3 to 5 degrees was used as raw water, and the raw water was supplied into the container for 10 minutes from the supply port with a pump at a flow rate of about 30 LZ, followed by filtration by the total filtration method. Next, about 6 OLZ of treated water and 50 LZ of compressed air are mixed and supplied from the treated water outlet 9 into the treated water chamber 19 for back pressure washing for 1 minute! At the same time, 15 LZ of air is fed into the raw water. Scrubbing was also performed by supplying the raw water chamber 20 from the supply port 8. Thereafter, all the raw water in the container was drained.

[0046] When water treatment was performed while repeating the above steps, stable operation was continued for about 100 hours or more, and treated water was obtained.

Industrial applicability

[0047] Since the water treatment apparatus of the present invention can perform stable water treatment at a high flow rate for a long time even with a small apparatus, the application requires a large amount of water treatment in a short time, for example, a lake, It can be used for removing suspended substances in outdoor water systems such as moats and rivers.

Claims

The scope of the claims

[1] A sealed container having a raw water supply port and a treated water outlet, and an opening for partitioning the inside of the container into a raw water chamber having a raw water supply port and a treated water chamber having a treated water outlet A water treatment apparatus comprising: a partition plate; a cylindrical filter medium having one end opened and the other end closed; and a cylindrical body including a water-permeable surface inserted into the cylindrical filter medium. An opening end portion of the cylindrical filter medium is disposed so as to be in a liquid-tight state with an opening portion of the plate, and the cylindrical filter medium is composed of a napped knitted fabric having napped fibers and has napped surfaces. Water treatment device characterized by being located on the raw water side.

[2] The cleaning fluid supply means for supplying the compressed gas or the compressed gas mixed fluid to the treated water chamber and Z or the raw water chamber is further disposed! Water treatment equipment.

[3] The compressed fluid supply device having a flow path for supplying the compressed gas to the treated water chamber, or the flow path I for supplying the compressed gas to the treated water chamber and the compressed gas to the raw water chamber. The water treatment apparatus according to claim 2, further comprising a compressed gas supply device provided with a flow path for supplying to the water.

[4] The water treatment device according to claim 1, wherein the single yarn diameter of the napped yarn in the napped knitted fabric constituting the tubular filter medium is 1.0 to LO / z m.

[5] The water treatment device according to claim 1, wherein the length of the napped in the napped knitted fabric constituting the tubular filter medium is 2 to: LOmm.

[6] Ratio of the cross-sectional area (A) of the cross-section of the tubular filter medium to the cross-sectional area (B) of the cross-section of the tubular body (

The water treatment apparatus according to claim 1, wherein A / B) is 1.1 or more.

[7] One end of the cylindrical body inserted into the cylindrical filter medium is connected to the opening of the partition plate.

2. The water treatment apparatus according to claim 1, wherein the entire surface of the tubular body through which water can pass is covered with a tubular filter medium.

8. The water treatment apparatus according to claim 1, wherein a plurality of the tubular filter media and the tubular body are arranged in the raw water chamber.

[9] It is installed in the container so that the longitudinal direction of the tubular filter medium and the tubular body is horizontal.

The water treatment device according to claim 1, wherein V is a water treatment device.

[10] The treated water outlet of the upstream water treatment device and the raw water supply port of the downstream water treatment device are connected so that a plurality of the water treatment devices according to claim 1 are arranged in series. A water treatment method characterized by supplying treated water from an upstream water treatment device to a downstream water treatment device and sequentially passing the water through.

[11] When exchanging the cylindrical filter medium in the water treatment device according to claim 8, the cylindrical filter medium and the cylindrical body are attached to the partition plate and are detached and replaced from the container. A method for replacing a tubular filter medium characterized by the above.