JP2010119944A - Filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter requiring less labor in manufacturing compared to conventional ones. <P>SOLUTION: The filter has a casing 2 housing a filter medium, the filter medium being stepwise arranged roughly in layers with the medium of larger particle sizes set in the lower layer. A discharge port 3 for filtrate is provided at the lower end of the casing 2, the discharge port 3 is provided with a covering member 4, the covering member 4 is formed with water passing holes 5 for the filtrate, the size and shape of the water passing holes 5 are set not to pass the filter medium of the layer, with the total area of the water passing holes 5 same as, or larger than the area of a supply port S, and water to be filtered is fed to the upper part of the filter medium. Thus, a complicated structure consisting of water collection pipes (main pipe and branched pipes) and a strainer (water collection nozzle) is not needed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a filter for treating pool water, bath water, various factory effluents, and the like.

2. Description of the Related Art Conventionally, a filtering device that processes water and other liquids in facilities such as a pool, a bathhouse, and a factory is known (for example, Patent Document 1).
That is, as shown in FIG. 3, a water treatment filtration device used in a system for filtering water such as a pool or a bathhouse has a water collection mechanism 53 at the base end of a drain outlet 52 for discharging the filtered water in the tank 51. The water filtered by passing through the filter media stacked in the tank 51 was collected by the water collecting mechanism 53 and led to the drain port 52. The water collecting mechanism 53 is connected to the base end of the drainage port 52 and functions as a conduit for guiding water to the drainage port, and is connected to the main pipe in a state of extending horizontally from the side portion of the main pipe 54. And a plurality of stainless steel branch pipes 55 functioning as conduits for leading water to the main pipe, collecting water through the main pipes 54 and a large number of through holes 56 formed in the branch pipes 55, and draining the water through the main pipes 54. The filtered water was led to the mouth 52.
In the water collecting mechanism 53, a strainer is attached to each through hole 56 in order to prevent foreign matters such as filter media generally made of filtered sand from entering the filtered water led to the drain port 52. As shown in FIG. 4, the strainer 57 has a bowl-like outer shape and is formed in a hollow shape, and a plurality of through grooves 58 that allow filtered water to pass therethrough and prevent foreign substances from passing therethrough are provided. An adequate amount of water was secured while preventing foreign matter from entering the water.
However, there is a problem that the strainer itself has a somewhat complicated structure, and it takes a lot of work to attach each of the strainers to a plurality of through holes formed in the main pipe and the branch pipe.
Japanese Utility Model Publication No. 6-24704

Therefore, the present invention seeks to provide a filter that requires less time and effort to manufacture than before.

In order to solve the above problems, the present invention takes the following technical means.
(1) The filter of the present invention has a housing for accommodating a filtering material, and the filtering material is arranged in a layered manner stepwise with a large particle size downward, and is provided at the lower end of the housing. There is an outlet for filtered water, a cover member is provided at the outlet, and a water passage hole for filtered water is formed in the cover member, and the size and shape of the water hole is the filter medium of the layer. Is set such that the total area of the water passage holes is equal to or larger than the area of the supply port, and the water to be filtered is supplied above the filter medium.
By configuring the present filter in this way, it is not necessary to take a complicated structure consisting of a water collection pipe (main pipe and branch pipe) and a strainer (water collection nozzle).
In the past, strainers were formed with multiple slits (notch grooves) with a width of about 0.2 mm, which were intended to physically block foreign substances such as ss components in the wastewater. Assuming that the size and shape of the water passage holes are set so that the filter medium of the layer does not pass and the total area of the water passage holes is the same as or larger than the area of the supply port, the ss component in the drainage is Although it is thought that there is a fear of passing through the water passage hole, the filter material in the housing is gradually layered step by step with the large particle size down (the fine one with small particle size is above) And the water to be treated is supplied to the upper side of the filter medium, and the solid content has already been filtered out at the position of the discharge port at the lower end of the casing. Foreign objects cannot reach the bottom outlet, so the strainer Ku also the performance of the filter is adapted to be exhibited. Here, the filter medium can be accommodated in the housing from the lower layer to the upper layer in the order of, for example, ballast (large), ballast (medium), ballast (small), sand (medium), and sand (thin).
In addition, since the total area of the water passage holes of the covering member that covers the discharge port is set to be the same as or larger than the area of the supply port, it is possible to prevent the inside of the housing from becoming an overpressure state, It is possible to carry out the treatment without impairing the filtration capacity. Here, the shape of the water passage hole (penetrating portion) may be substantially circular or elliptical, polygonal or slit-shaped.
The covering member having the water passage hole forms a plurality of punching holes (for example, 4 mmφ) in a stainless steel metal body (for example, 450 mmφ) having a dome shape (shape like a cut “part of a spherical shell”), for example. Thus, it can be manufactured relatively easily, and the dome-shaped metal body can be arranged so as to protrude upward and cover the discharge port (for example, 20 to 250 mmφ). For example, if the supply port is 240 mmφ, the number of punching holes is 240 mmφ ÷ 4 mmφ and 60 or more.
Note that water is supplied from the discharge port when the inside of the housing is back-washed.
This filter replaces pool water, bath water, factory wastewater, restaurant wastewater, general household wastewater, contaminated soil wastewater, painting plant and other VOC gases with scrubber (exhaust gas cleaning device). It can be used for drainage filtration, etc., and water that is purified and reused, such as factory wastewater, and water that is circulated and purified, such as pool water and bath water, can be suitably filtered. .

(2) You may make it fix a cover body directly to the insertion port of the filter material opened above the said housing | casing.
Since a large water pressure is applied to the inside of the case during the filtration process, it is preferable to have a shape that is as close to a sphere as possible without unevenness in order to avoid the formation of stress-concentrated parts, and the case has a continuous rounded surface as a whole. It is formed. Specifically, the upper and lower closed portions of the bowl-shaped lid without a base are fixed to the upper and lower sides of a metal cylindrical body (which becomes the central barrel portion) by welding. Conventionally, a cylindrical neck portion is welded, a flange portion is welded to the upper end of the neck portion, and a lid is fixed to the flange portion.
On the other hand, cost reduction can be aimed at by comprising as mentioned above and simplifying the structure of a housing | casing by omitting the metal welding cylindrical body (what is called a neck part) of the insertion port of a filter medium. . In addition, when the welded cylindrical body is fixed to the housing, there are inevitably problems with pressure resistance and corrosion / durability in the vicinity of the neck weld, but the structure is as simple as the above. Therefore, the occurrence of various problems can be suppressed. This structure can also be applied to a discharge port at the bottom of the casing and a pipe portion (side port) for supplying filtered water to the casing.
In addition, when there is a neck part and a flange part as in the conventional case, it was possible to pinch through the bolt from both sides by overlapping the lid, but the lid part was fixed directly to the curved housing, and the neck part and the flange part In order to prevent this, there is a structure in which a plurality of bolts are erected in advance from the housing side toward the outside. A hole is formed in the lid body at a position corresponding to the bolt, and a bolt is inserted into the hole of the lid body, and a nut is screwed and tightened to be fixed.
Furthermore, since the number of places to be welded can be reduced as compared with the conventional case, crevice corrosion is less likely to occur. That is, the joint / weld spot between the neck and the housing, and the joint / weld spot between the neck and the flange were prone to rust and pressure concentrated, but this would reduce the risk of such problems. Can do.
In addition, the outer periphery of the cover member is covered with an insulator (shaped like a PVC tube cut in the longitudinal direction) in an annular shape, and the stainless cover member and the inner surface of the metal casing This ensures electrical insulation and prevents crevice corrosion.
The insertion port has a size that allows people to enter and exit. During installation of the filter, the insertion port has a large ballast, a large ballast, a small ballast, a small ball, a medium sand, and a small sand. The lid is fixed to the casing when the storing operation is completed. On the other hand, when the filtration process is performed, the filter medium deteriorates with time in the long term. Therefore, after the predetermined period has elapsed, the lid is opened and a replacement work with a new filter medium is performed.
(3) This filter can be used for the filtration process of water treatment systems, such as pool water and factory system drainage, for example.
This water treatment system has a treatment tank (supplied with an oxidizing agent such as hypohalous acid) that oxidizes and decomposes soil components dissolved in the treated water, and a filter that removes ss components and solids in the treated water And a diaphragm electrolysis mechanism that further proceeds oxidative decomposition after the oxidative decomposition in the treatment tank and subsequently reduces residual chlorine, and a piping path that connects the two.
The filter is disposed between the treatment tank and the diaphragm electrolysis mechanism, and effectively suppresses clogging of the diaphragm and the like in the diaphragm electrolysis mechanism. Here, the filter is supplied with water having a high residual salt concentration after leaving the treatment tank to which an oxidizing agent such as hypohalous acid is supplied, so that the inner surface of the can body is provided with chemical resistance. Tar and epoxy can be applied. Further, an insulating film is formed on the inner surface to prevent crevice corrosion of the can body. As this insulating film, tar epoxy or fluororesin can be applied, or glass coating can be applied.

The present invention is configured as described above and has the following effects.
Since it is not necessary to take a complicated structure consisting of a water collection pipe (main pipe and branch pipe) and a strainer (water collection nozzle), it is possible to provide a filter that requires less time and effort to manufacture than before.

Embodiments of the present invention will be described below.
[1] As shown in FIG. 1, the filter 1 of this embodiment has a housing 2 in which a filter medium (not shown) is accommodated, and the filter medium is stepwise with a large particle size as a lower part. Are arranged in layers. A filtered water discharge port 3 is provided at the lower end of the housing 1, a cover member 4 is provided in the discharge port 3, and a filtered water flow hole 5 is formed in the cover member 4. Further, the size and shape of the water passage hole 5 are set so that the filter medium of the layer does not pass through and the total area of the water passage holes 5 is equal to or larger than the area of the supply port S. The filter medium is accommodated in the housing 2 from the lower layer toward the upper layer in the order of ballast (large), ballast (medium), ballast (small), sand (medium), and sand (thin).

Since this filter 1 has such a structure, it is not necessary to take a complicated structure consisting of a water collecting pipe (main pipe and branch pipe) and a strainer (water collecting nozzle), and it takes less time to manufacture than in the past.
The filter 1 is provided with a pipe 7 to be treated supplied from the previous step through a five-way valve 6 and a pipe 8 (filtered water for supplying the water to be filtered to be filtered into the filter). And a pipe 9 for supplying the filtered water discharged from the discharge port 3 to the next process is connected. The pipe 8 that is supplied into the filter is connected to a pipe 10 made of polyvinyl chloride that ejects water to be filtered upward in the housing.
Further, the water to be filtered is supplied above the filter medium, and the water to be filtered is supplied under pressure and filtered. When the interior of the housing 2 is back-washed, water is supplied from the discharge port 3.

  By the way, conventionally, a plurality of slits 58 (notch grooves) having a width of about 0.2 mm are formed in the strainer 57 (see FIG. 4) to physically block the passage of foreign matters such as ss components in the drainage. On the other hand, as described above, the size and shape of the water passage hole 5 are set so that the filter medium of the layer does not pass and the total area of the water passage hole 5 is equal to or larger than the area of the supply port S. Then, it is considered that there is a concern that the ss component in the wastewater may pass through the water passage hole 5, but the filter medium in the housing 2 has a large particle size downward (small particle size) The fine water is arranged in layers in a stepwise manner and the water to be treated is supplied to the upper side of the filter medium, and the solid content is already filtered at the position of the outlet 3 at the lower end of the housing 2. Because of the structure taken, foreign matter such as ss component is up to the lower outlet 3 Therefore, even if there is no strainer, the performance as a filter can be exhibited.

  And since the total area of the water flow hole 5 of the covering member 4 which covers the discharge port 3 is set so that it may become the same as the area of the supply port S, it will prevent that the inside of the housing | casing 2 will be in an overpressure state. In addition, the processing can be performed without impairing the filtering ability of the entire housing 2. Here, the shape of the water passage hole 5 (penetrating portion) may be substantially circular or elliptical, may be polygonal, or may be slit.

  The covering member 4 having the water passage hole 5 is formed with a plurality of punching holes (4 mmφ) in a dome-shaped (shaped like “part of a spherical shell”) stainless steel metal body (450 mmφ). Thus, the dome-shaped metal body is projected upward so as to cover the discharge port (240 mmφ). Further, the supply port S is set to 240 mmφ, and the number of punching holes is 240 mmφ ÷ 4 mmφ, which is 60 or more.

  This filter 1 replaces pool water, bath water, factory wastewater, restaurant wastewater, general household wastewater, contaminated soil wastewater, paint factory and other VOC gases with scrubber (exhaust gas cleaning device). It can be used to filter wastewater that has been purified, and water that is purified and reused, such as factory wastewater, and water that is circulated and purified, such as pool water and bath water, can be suitably filtered. it can.

[2] The lid 12 is directly fixed to the filter medium insertion port 11 opened above the housing 2.
Since a large water pressure is applied to the inside of the housing 2 during the filtration process, a shape that is as close to a spherical body as possible is preferable in order to avoid the formation of stress-concentrated portions, and the housing 2 has a continuous rounded surface as a whole. Let them form. Specifically, a bowl-shaped lid-like upper and lower closing part 14 without a base is fixed to the upper and lower parts of a metal cylindrical body (which becomes the central barrel part 13) by welding. Conventionally, a cylindrical neck portion is welded, a flange portion is welded to the upper end of the neck portion, and a lid is fixed to the flange portion.

  On the other hand, the cost can be reduced by omitting the metal welded cylindrical body (so-called neck portion) at the filter medium insertion port as described above and simplifying the structure of the housing 2. In addition, when the welded cylindrical body is fixed to the casing, problems with pressure resistance, corrosion and durability are likely to occur in the vicinity of the neck-shaped weld, but the structure is as simple as the above. Therefore, the occurrence of various problems can be suppressed. This structure can also be applied to a discharge port at the bottom of the casing and a pipe portion (side port) for supplying filtered water to the casing.

In addition, when there is a neck portion and a flange portion as in the prior art, the lid body can be overlapped with the bolts and clamped from both sides, but the lid body 12 is directly fixed to the curved housing 2 and the neck portion and Since the structure does not have a flange portion, a plurality of bolts 15 are erected in advance from the housing 2 side toward the outside. A hole is formed in the lid 12 at a position corresponding to the bolt 15, and the bolt 15 is inserted into the hole of the lid 12, and a nut (not shown) is screwed and tightened to be fixed. To do.
Furthermore, since the number of places to be welded can be reduced as compared with the conventional case, crevice corrosion is less likely to occur. That is, the joint / weld spot between the neck and the housing, and the joint / weld spot between the neck and the flange were prone to rust and pressure was easily concentrated, but the degree of occurrence of such problems should be reduced. Can do.
In addition, the outer peripheral edge of the cover member 4 is covered with an insulator (shaped like a PVC tube cut in the longitudinal direction, not shown) in an annular shape, and the stainless cover member 4 and metal The electrical insulation with the inner surface of the case 2 made of metal is ensured and the occurrence of crevice corrosion is prevented.

  The insertion port 11 has a size that allows a person to enter and exit. When the filter 1 is installed, a ballast (large), a ballast (middle), a ballast (small), a sand (middle), a sand The cover 12 is housed in the case 2 in the order of (thin), and the lid 12 is fixed to the case 2 when the housing operation is completed. On the other hand, when the filtration process is performed, the filter medium deteriorates with time in the long run. Therefore, after a predetermined period of time, the lid 12 is opened and a replacement work with a new filter medium is performed.

[3] The filter 1 can be used in a filtration process of a water treatment system such as pool water or factory wastewater.
This water treatment system has a treatment tank (supplied with an oxidizing agent such as hypohalous acid) that oxidizes and decomposes soil components dissolved in the treated water, and a filter that removes ss components and solids in the treated water 1, a diaphragm electrolysis mechanism that further promotes oxidative decomposition after oxidative decomposition in the treatment tank and subsequently reduces residual chlorine, and a piping path that connects these.
The filter 1 is disposed between the treatment tank and the diaphragm electrolysis mechanism, and effectively suppresses clogging of the diaphragm and the like in the diaphragm electrolysis mechanism. Here, since the filter 1 is supplied with water having a high residual salt concentration after leaving the treatment tank to which an oxidizing agent such as hypohalous acid is supplied, the inner surface of the can body is provided with chemical resistance. In addition, tar and epoxy can be applied to the outer surface. In addition, an insulating film (not shown) is formed on the inner surface of the can 2 to prevent crevice corrosion. As this insulating film, tar epoxy or fluororesin can be applied, or glass coating can be applied.

The waste water treatment method using the water treatment system will be described in more detail.
(1) As shown in FIG. 2, in this wastewater treatment method, wastewater 16 is supplied to the anode side region 18 of the diaphragm electrolysis mechanism 17 and electrolyzed in the presence of chlorine (current 48A, electrode area 2.1 dm ² , wastewater Anode side treatment process (effective chlorine production cycle) that decomposes dirt components by supplying 180cc / min), and cathode side treatment process (reduction of residual chlorine) that is supplied to the cathode side region 19 to reduce residual chlorine Cycle). In the figure, 20 is a diaphragm of the diaphragm electrolysis mechanism 17, and P indicates a pump.

The wastewater 16 includes liquid crystal manufacturing factories, chemical product manufacturing factories and other factory-related wastewaters, restaurant-related wastewaters, restaurant-related wastewaters, general household wastewaters, contaminated soil-based wastewater soaked with dioxins and PCBs, painting plants and other VOC gases. It is possible to treat organic wastewater that has been replaced with water by a scrubber (exhaust gas cleaning device), pool water such as a fitness club, and bath water.
Ordinary organic components (formaldehyde, etc.), refractory organic compounds such as benzene, toluene, dioxins and PCBs, soil components eluted from the human skin surface, ammonia nitrogen and other inorganic components. Can be disassembled.

As a supply source of chlorine (element Cl) to coexist in the anode side region 18, sodium chloride, hypochlorous acid, or the like can be used.
By the way, in the anode side treatment process, the waste water 16 is supplied to the anode side region 18 of the diaphragm electrolysis mechanism 17 and electrolyzed in the presence of chlorine, thereby generating effective chlorine such as dissolved chlorine gas and hypochlorous acid. Dirt components (oxidized substances) are oxidized and decomposed, and the dirty components are decomposed and refined by direct oxidation from the anode electrode, eventually reaching carbon dioxide and nitrogen gas. COD, BOD, TOC Ammonia nitrogen is reduced and cleaned.

Then, in the cathode side processing step, the residual chlorine (effective chlorine remaining after decomposition of the soil components) is reduced by supplying the cathode side region 19. This is intended to reduce in the cathode side treatment process because residual chlorine remaining after decomposing the waste components of the waste water in the anode side treatment process hinders discharge and reuse.
Specifically, among the residual chlorine, hypochlorous acid is cathodic reduced in the cathode side region 19 and decomposed or deactivated in an alkaline atmosphere, so the residual chlorine is reduced by other methods that are not reducing agents. Can reduce the cost of running the drug.

(2) As a pretreatment for the anode-side treatment step, a hypohalous acid treatment tank 21 is provided in front of the anode-side region 18, and the dirt component in the waste water 16 is decomposed in advance in this tank. This is effective for wastewater with high COD, BOD, TOC, and ammoniacal nitrogen (fouling component index value) (for example, COD 1000 ppm), and to a degree corresponding to the decomposition suitability of the diaphragm electrolysis mechanism 17 (for example, COD 100 ppm) in advance. Purify. Specifically, hypochlorous acid 22 is electrolyzed and supplied to the hypohalous acid treatment tank 21 by the electrolytic device 23, and the supplied water contains active radical species (OH, radicals, active oxygen, active ozone). It is generated and has better resolution. Here, the hypochlorous acid 22 also serves as a chlorine supply source that coexists when electrolyzing in the anode side region 18.
Further, a sand filter 1 is interposed between the hypohalous acid treatment tank 21 and the anode side region 18 of the diaphragm electrolysis mechanism 17, and the fine particle ss component in the waste water 16 is previously removed by this sand filter 1. I try to keep it. This prevents clogging from occurring in the diaphragm electrolysis mechanism 17 or the like as described above.

(3) A drainage circulation channel 24 is formed in the cathode side region 19 and is circulated to the cathode side region 19 together with the drainage 25 (140 cc / min) from the anode side region 18.
By the way, from the anode side treatment step (to the cathode side treatment step via the gas-liquid mixing tank 26 described later), acidic waste water is sent out, but the circulation channel of the cathode side region 19 (becomes alkaline by electrolysis). Neutralized by combining with 24 effluents, resulting in a neutral atmosphere. By the way, chlorine gas (Cl ₂ ) dissolved in water when the hydrogen ion concentration is acidic has a property of changing to a form of hypochlorous acid (HOCl) in a neutral atmosphere. Therefore, the dissolved chlorine gas generated in the anode-side treatment step can be supplied to the cathode-side region 19 as a neutral atmosphere and changed into a form of hypochlorous acid. Then, the hypochlorous acid is cathodically reduced in the cathode side region 19 and decomposed or inactivated under an alkaline atmosphere. As a result, it is possible to prevent the generation of hypochlorous acid (HOCl) by combining with the hydroxyl group (OH) in the cathode-side treatment process while still in the form of dissolved chlorine gas (Cl ₂ ). it can.

(4) A chlorine gas separation tank 27 is formed in the drainage circulation channel 24 of the cathode side region 19 to separate dissolved chlorine gas in the drainage around the circulation channel 24 of the cathode side region 19 The residual chlorine concentration is reduced. Specifically, the chlorine gas separation tank 27 has a structure in which the waste chlorine is easily vaporized by spraying the waste water into droplets and expanding the surface area, and the waste chlorine gas is aerated with the blower B to dissolve chlorine gas. And the structure to extrude.

(5) A gas-liquid mixing tank 26 is formed between the anode-side area 18 and the cathode-side area 19, and the chlorine gas separated in the chlorine gas separation tank 27 is supplied thereto by the fan F, and the gas-liquid mixing tank 26 wastewater is fed back to the wastewater 16 (hypohalous acid treatment tank 21) before treatment and added (40 cc / min). Further, the drainage discharged from the anode side region 18 is supplied by being sprayed into the gas-liquid mixing tank 26.
By the way, when the chlorine gas separated in the chlorine gas separation tank 27 is supplied to the gas-liquid mixing tank 26 between the anode-side area 18 and the cathode-side area 19, it passes through the anode-side area 18 and becomes wastewater having surplus residual chlorine. Furthermore, chlorine gas dissolves and residual chlorine concentration increases. And by adding wastewater with increased residual chlorine concentration to the wastewater 16 before treatment (hypohalous acid treatment tank 21), the decomposition of the soil components in the wastewater 16 before being supplied to the anode side region 18 is promoted. I can keep it. In the gas-liquid mixing tank 26, the wastewater is circulated and sprayed so that the dissolution of chlorine gas into the wastewater progresses with time.

  Further, the chlorine gas evaporated in the hypohalous acid treatment tank 21 (sealed tank) is also supplied to the gas-liquid mixing tank 26 by the fan F. Thus, the gas-liquid mixing tank 26 functions as a chlorine concentration tank that collects chlorine gas vaporized during the treatment and dissolves it again in the waste water by gas-liquid mixing. This is fed back to the halogen acid treatment tank 21 to promote the decomposition of the soil components of the waste water 16. As a result, the chlorine gas evaporated from the waste water during the treatment can be used for the purification of the waste water without being wasted, and the waste water treatment system has a high utilization efficiency of hypohalous acid. In the next cathode side treatment step, the residual chlorine is reduced and discharged.

(6) From the circulation channel 24, substantially the same amount of water is supplied to the anode side region 18 of the diaphragm electrolysis mechanism 17 (in consideration of the feedback amount to the hypohalous acid treatment tank 21 described above). It is finally drawn out to the discharge channel (Z) and supplied to the next process such as discharge and reuse cycle.
Here, the residual chlorine concentration at the outlet (X) of the anode side region 18 and the outlet (Y) of the gas-liquid mixing tank 26 is about 3500 ppm, whereas the discharge side flow of the circulation channel 24 in the cathode side region 19 The residual chlorine concentration in the road (Z) was reduced to about 2000 ppm. In view of the required water quality of the post-process, the residual chlorine may be further reduced by adding a thinning reducing agent after the discharge side channel (Z). Since the residual chlorine is once reduced in the cathode side region 19, the running cost of the reducing agent to be added can be reduced. On the other hand, the COD of drainage at the inlet (A) of the anode side region 18 was about 100 ppm, but the discharge side channel (Z) of the circulation channel 24 in the cathode side region 19 was reduced to 5 ppm or less (estimated 0 ppm). It was reduced.

(7) The cathode side region 19 is set to have a higher water pressure and a differential pressure than the anode side region 18, and the effective chlorine in the anode side region 18 passes through the diaphragm 20 and enters the cathode side region 19. This can be prevented.
As a cathode electrode in the cathode side region 19 and an anode electrode in the anode side region 18, a row of a plurality of columnar electrodes is arranged, and on a flat surface like a normal plate electrode In addition, since the surface area can be expanded three-dimensionally by a row of a plurality of columnar electrodes, the electrolysis efficiency can be increased. Also, the drainage does not flow just as licking as a laminar flow along the electrode surface like a plate electrode, but it behaves like a turbulent flow around the columnar electrode array and changing the flow direction in a complicated manner. The mixing in the region is promoted by the stirring action of the drainage due to.

  Further, the columnar electrodes are formed by connecting a plurality of short electrodes in the longitudinal direction. With such a short articulated structure, the yield during firing in the case of being made of ceramics (excellent in non-eluting properties) is improved as compared with the long body. Examples of the shape of the columnar electrode include a columnar shape, a cylindrical shape, a polygonal cross-sectional shape with smoothed corners to prevent local discharge, an elliptical cross-sectional shape, and those in which spherical electrodes are continuously arranged in a columnar shape.

  It is a filter that takes less time to manufacture than before, and can be applied to various water treatment system applications.

The longitudinal cross-sectional view explaining embodiment of the filter of this invention. The system flow figure explaining the water treatment system using the filter of this invention. The cross-sectional view of the conventional filter. Explanatory drawing of the external appearance of the strainer of the conventional filter.

Explanation of symbols

S supply port 2 housing 3 discharge port 4 covering member 5 water passage hole
11 Insertion slot
12 Lid

Claims (2)

  It has a housing 2 for storing the filtering material, the filtering material is arranged in a layered manner stepwise with a large particle size downward, and there is an outlet 3 for filtered water at the lower end of the housing 2 The discharge port 3 is provided with a cover member 4, and the cover member 4 has a water passage hole 5 for filtered water. The size and shape of the water hole 5 pass through the filter medium of the layer. The filter is characterized in that the total area of the water passage holes 5 is set to be equal to or larger than the area of the supply port S, and the water to be filtered is supplied above the filter medium.   The filter according to claim 1, wherein the lid body (12) is directly fixed to the filter medium insertion port (11) opened above the housing.