JP5527663B2 - Multistage filter - Google Patents

Description

  The present invention relates to a multi-stage filtration device that filters treated water such as seawater and sewage containing foreign substances such as microorganisms and solids, and in particular, a filter body having a net-like filter that filters treated water is separated vertically. A plurality of multistage filtration devices.

Conventionally, as this type of multistage filtration device, for example, one described in Patent Document 1 (Japanese Patent Publication No. 7-112424) is known.
As shown in FIG. 8, this multistage filtration device Sa is provided on the base 100 and is inclined so that the treated water flows down, the tip 111 is positioned below the base end 112 and flows down to the bottom surface 113. A plurality of filter bodies 110 having a net-like filter 114 for filtering water and having a discharge port 115 for discharging treated water flowing down to the tip 111 side as waste water are provided. The plurality of filter bodies 110 are arranged apart from each other so as to sequentially receive the treated water that has passed through the filter 114 of each filter body 110, and the treated water is supplied to the uppermost filter body 110 a by the treated water supply unit 130. And the water that has passed through the lowermost filter body 110b is taken out as filtered water.

The plurality of filter bodies 110 are installed such that all the filter bodies 110 from the uppermost filter body 110a to the lowermost filter body 110b have the same inclination angle. That is, each filter body 110 is installed so that its longitudinal direction is parallel.
Further, the coarseness of the filters 114 of the plurality of filter bodies 110 is formed so as to become finer in order from the filter 114 provided on the uppermost filter body 110a to the filter 114 provided on the lowermost filter body 110b. ing.

Further, below the filter body 110 other than the lowermost filter body 110b, one end 121 is positioned below the other end 122 so as to have an inclination direction opposite to the inclination direction of each filter body 110, and the base 100 The flow guide plate 120 is provided for receiving the treated water that has passed through the corresponding filter bodies 110 and flowing down.
Furthermore, on the one end 121 side of the flow guide plate 120, a barrier plate 123 provided on the base 100 and blocking the treated water flowing down the flow guide plate 120 is provided. A gap 126 is formed between one end edge 125 of the flow guide plate 120.

When using this multistage filtration device Sa to filter treated water such as seawater and sewage containing foreign matter such as microorganisms and solids, the treated water is supplied from the treated water supply unit 130 to the uppermost filter body 110a. . The supplied treated water is filtered by the filter 114 of the uppermost filter body 110a, passes through the filter 114, reaches the flow guide plate 120, flows down the flow guide plate 120, and the weir plate 123 and the flow guide plate 120. It is dropped from the gap 126 and sent to the lower filter body 110. Then, it sequentially passes through the lower filter body 110 and the flow guide plate 120, is sent to the lowermost filter body 110b, is filtered by the filter 114 of the lowermost filter body 110b, and is taken out as filtered water. At this time, the filter 114 of the filter body 110 is formed so that the coarseness of the filter 114 becomes finer in order from the filter 114 of the uppermost filter body 110a to the filter 114 of the lowermost filter body 110b. Foreign substances are removed in descending order.
On the other hand, the waste water containing foreign matter filtered on each filter body 110 and remaining on the filter 114 naturally flows down by the inclination of each filter body 110 and is pushed to the tip 111 side by the water pressure of the treated water that is sequentially sent, It is discharged from the discharge port 115 as waste water.

Japanese Patent Publication No.7-112424

  However, in this conventional multi-stage filtration device Sa, since the inclination angles of the plurality of filter bodies 110 are all the same angle, the flow rate of drainage flowing down the filter body 110 is substantially the same, In the lower filter body 110, the foreign matter filtered by the filter 114 of the filter body 110 is relatively small, so there is no problem with the foreign matter easily flowing along with the drainage. On the other hand, the upper filter body In 110, since the foreign material filtered by the filter 114 of the filter body 110 is relatively large, the foreign material stays and does not easily flow along with the drainage, and the filter 114 of the filter body 110 is easily clogged by the foreign material. As a result, the filtration accuracy of treated water deteriorates, and clogging reduces the amount of water passing through the treated water filter, resulting in poor treatment efficiency. It was.

  The present invention has been made in view of such problems, and in particular, prevents clogging of the filter by foreign matter in the upper filter body, ensures as much filtration capacity as possible, and improves filtration efficiency. An object of the present invention is to provide a multi-stage filtration apparatus.

  In order to achieve such an object, the multistage filtration apparatus of the present invention is a treated water that is provided on a base and is inclined with the tip positioned below the base end so that the treated water flows down and flows down to the bottom surface. A plurality of filter bodies each having a net-like filter for filtering water and having a discharge port for discharging treated water flowing down to the tip side as waste water, and the plurality of filter bodies are treated water that has passed through the filters of the respective filter bodies. So that the filter meshes of the plurality of filter bodies are coarsened from the filter provided on the uppermost filter body to the filter provided on the lowermost filter body. In the multi-stage filtration apparatus, in which the treated water is supplied to the uppermost filter body by the treated water supply unit, and the water that has passed through the lowermost filter body is taken out as filtered water. The top The inclination angle from the filter body in order of lowest filtration body is the installation was configured to be gentle.

Thus, when using this multistage filtration device to filter treated water such as seawater and sewage containing foreign substances such as microorganisms and solids, the treated water is supplied from the treated water supply unit to the uppermost filter body. . The supplied treated water is filtered by the filter of the uppermost filter body, passes through the filter, and is sent to the lower filter body. In this way, it passes through the lower filter body sequentially and is sent to the lowermost filter body, and is filtered through the filter of the lowermost filter body and taken out as filtered water. At this time, the filter body is formed so that the coarseness of the filter filter becomes finer in order from the filter of the uppermost filter to the filter of the lowermost filter, so that the foreign matter contained in the treated water is large. It will be removed in order.
On the other hand, wastewater containing foreign matters remaining on the filter after being filtered by each filter body flows down naturally by the inclination of each filter body and is pushed away to the tip side by the water pressure of the treated water that is sequentially sent, and drains from the discharge port. As discharged.

  In this case, in the upper filter body, the foreign matter filtered by the filter of the filter body is relatively large, so the foreign matter tends to stay, but the inclination angle of each filter body is different from that of the uppermost filter body. Since it is installed so as to become gentler in the order of the lowermost filter body, that is, since the inclination angle of the filter body is varied according to the roughness of the filter, in the upper filter body Since the inclination angle of the filter body is relatively steep, the speed at which the drainage naturally flows down is increased, so that foreign matter is quickly washed away, so that it is possible to prevent the filter from being clogged even with large foreign matter. it can. For this reason, since there is no clogging, the filtration capacity of the treated water can be secured as much as possible in the upper filter body, and the filtration efficiency can be improved. In addition, since the filter can be prevented from being clogged with foreign matter, it can be filtered with high accuracy even when a large amount of treated water is supplied.

And it is set as the structure which formed the said filter body in the bowl shape of a cross-sectional semicircle as needed.
As a result, the waste water is focused on the central axis extending in the longitudinal direction of the filter body, so that the waste water can be surely pushed to the front end side of the filter body by the treated water that is sequentially sent. The drainage can be reliably discharged from the outlet. Moreover, since waste water can be reliably washed away with treated water, it is possible to reliably prevent the filter from being clogged by foreign matter in the waste water.

  Further, if necessary, the treated water supply unit is formed into a hollow cylindrical shape having an axial line extending in the vertical direction and having a lower end closed with a pump that sucks treated water and aerates and ejects the treated water. A cylinder in which an inflow port into which treated water ejected from the pump is introduced is formed, and an outflow port for supplying the treated water introduced from the inflow port to the uppermost filter body is formed above the inflow port. It is configured with a body.

Thus, the treated water is sucked by the pump, aerated in the pump, and ejected from the inlet of the cylinder toward the inside of the cylinder. In this case, since the lower end of the cylinder is closed, the treated water rises in the cylinder, flows out from the outlet, and is supplied to the uppermost filter.
At this time, since the treated water ejected from the pump is aerated in the pump, microorganisms and solid matter that are lighter than the water contained in the treated water adhere to the air and rise together with the treated water in the cylinder. Microorganisms and solids heavier than the water contained in the treated water sink and accumulate on the lower end side of the cylinder together with some treated water. That is, in this supply part, since the foreign material heavier than the water contained in the treated water is removed, the treated water is filtered by the filter body, so that the filtration efficiency of the treated water can be further improved. Foreign matter that sinks to the bottom end of the cylinder is removed and discarded in a timely manner.

Furthermore, if necessary, a splash prevention screen is provided that is provided above the uppermost filter body and receives and passes the treated water flowing out from the outlet of the cylindrical body and prevents the treated water from being scattered. .
Thereby, since it is possible to prevent the treated water flowing out from the outlet from splashing outside the base, the treated water from the outlet can be reliably supplied to the uppermost filter body. In addition, since the treated water flowing out from the outlet is received and passed by the splash prevention screen, the splash prevention screen can remove the foreign matter to some extent and then supply the treated water to the filter body. The filtration efficiency of treated water can be improved. Furthermore, if treated water is supplied directly from the outlet to the filter, the filter may be adversely affected by the pressure of the treated water or large foreign matter. However, after receiving the treated water once with the splash prevention screen, supply the filtered water to the filter. Can protect the filter.

Furthermore, it is set as the structure which installed each said filter body so that removal was possible with respect to the said base as needed.
As a result, when the filter body becomes dirty, the filter body can be removed from the base and cleaned, so that the filter body can be easily cleaned, and when the filter body has deteriorated, the deteriorated filter body Since the filter body can be easily replaced by removing and attaching a new filter body, the maintenance of the filter body can be easily performed. In particular, since the filter is easily contaminated or deteriorated, the filter can be easily cleaned or replaced, so that maintenance of the apparatus can be easily performed.

Further, if necessary, a lead-out path body that is provided on the base and connected to the discharge ports of the filter bodies so as to lead out the drainage discharged from the discharge ports to the outside of the base. And an aggregated path body that collects and drains the drained water derived from each of the derived path bodies.
As a result, the waste water that has been filtered by the filter of each filter body and remains on the filter flows down to the front end side of each filter body due to the inclination of the filter body and the water pressure of the treated water that is sent sequentially, from the outlet. Discharged. The drainage discharged from the discharge port is led out to the aggregated path through each outlet path, and is aggregated by the aggregated path and discharged to the outside of the base. Accordingly, the drainage can be reliably discharged to the outside of the base, so that the filtered water and the drainage are not mixed, and therefore, the filtered water and the drainage can be reliably obtained from the treated water.

Further, if necessary, the lead-out path body is disposed so as to extend in a direction perpendicular to the longitudinal direction of the filter bodies and to one side outward of the filter bodies. The lower filter body is arranged side by side on the outside and below.
Thereby, since the aggregated road bodies are arranged side by side, the apparatus can be made compact.

Furthermore, if necessary, each filter body includes a main body in which a through hole that is closed by a filter is formed on the bottom surface, and the filter is provided so as to be removable from the main body. Yes.
As a result, when the filter becomes dirty, the filter can be removed from the main body and cleaned, so that the filter can be easily cleaned. When the filter has deteriorated, the deteriorated filter is removed and a new filter is removed. Since the filter can be easily replaced by attaching the filter, the filter can be easily maintained. In addition, since the main body can also be removed from the base, maintenance of the main body and the filter can be further facilitated by removing the main body from the base and performing maintenance.

Further, if necessary, the main body is formed in a bowl shape, and the filter is formed in a hook shape that fits inside the main body.
Thereby, when holding a filter in a main body, it carries out by fitting a filter inside a main body. In this case, since the filter is only fitted inside the main body, the filter can be easily attached to the main body, and the filter can be securely held by the main body because the filter is fitted. Moreover, since the filter is formed larger than the through hole, the filter can be easily attached to the main body, and the filter can be easily detached from the main body. Further, since the filter is formed in a bowl shape, the waste water is focused on the central axis extending in the longitudinal direction of the filter. Since it can be swept away, the waste water can be reliably discharged from the discharge port, and a situation in which the filter is clogged by foreign matter in the waste water can be reliably prevented. Furthermore, the treated water filtered by the filter is received by the bottom surface of the main body, passes through the through hole, and is sent to the lower filter body. At this time, since the main body is formed in a bowl shape, the filtered treated water is focused on the central axis extending in the longitudinal direction of the main body, and therefore, the treated water is surely passed from the through hole to the lower filter body. Can be sent to.

Furthermore, it comprises a grid-like reinforcing frame to which the filter is attached if necessary.
Thereby, since the strength of the filter can be improved, the filter can be used for a long period of time, and the cost can be reduced accordingly. Moreover, since the reinforcement frame is a lattice shape, it does not obstruct the passage of treated water.

  According to the multistage filtration device of the present invention, when the treated water is supplied from the treated water supply unit to the uppermost filter body, the treated water is filtered by the filter of the uppermost filter body, passes through the filter, and is sequentially subordinated. Is filtered through a filter of the lowermost filter body and taken out as filtered water. On the other hand, wastewater containing foreign matters remaining on the filter after being filtered by each filter body flows down naturally by the inclination of each filter body and is pushed away to the tip side by the water pressure of the treated water that is sequentially sent, and drains from the discharge port. As discharged.

  In this case, in the upper filter body, the foreign matter filtered by the filter of the filter body is relatively large, so the foreign matter tends to stay, but the inclination angle of each filter body is different from that of the uppermost filter body. Since it is installed so as to become gentler in the order of the lowermost filter body, that is, since the inclination angle of the filter body is varied according to the roughness of the filter, in the upper filter body Since the inclination angle of the filter body is relatively steep, the speed at which the drainage naturally flows down is increased, so that foreign matter is quickly washed away, so that it is possible to prevent the filter from being clogged even with large foreign matter. it can. For this reason, since there is no clogging, the filtration capacity of the treated water can be secured as much as possible in the upper filter body, and the filtration efficiency can be improved. In addition, since the filter can be prevented from being clogged with foreign matter, it can be filtered with high accuracy even when a large amount of treated water is supplied.

It is a perspective view which shows the multistage filter apparatus which concerns on embodiment of this invention. It is a side view which shows the multistage filter apparatus which concerns on embodiment of this invention. It is a top view which shows the multistage filter apparatus which concerns on embodiment of this invention. It is a front view which shows the multistage filter apparatus which concerns on embodiment of this invention. It is a principal part disassembled perspective view which shows the multistage filter apparatus which concerns on embodiment of this invention. It is a disassembled perspective view which shows the filter body which concerns on another embodiment of this invention. It is sectional drawing which shows the filter body which concerns on another embodiment of this invention. An example of the conventional multistage type filtration apparatus is shown, (a) is a perspective view, (b) is a side view.

Hereinafter, a multistage filtration apparatus according to an embodiment of the present invention will be described with reference to the accompanying drawings.
1 to 5 show a multistage filtration device S according to an embodiment of the present invention. The basic configuration of the multi-stage filtration apparatus S of the present invention includes a base 1, a plurality of filter bodies 10 arranged vertically, and a treated water supply unit 20. The treated water W is supplied to the filter body 10a, and the water that has passed through the lowest-order filter body 10b is taken out as filtered water Wa.

  In the present embodiment, seawater containing foreign matter such as microorganisms such as plankton and solid matter is used as the treated water W, and this is filtered to cultivate, for example, sea cucumbers, salmon, scallops, oysters, sea urchins, etc. Filtration water Wa is obtained as the water for aquaculture. In the filtered water Wa used for such applications, juvenile sea cucumbers and juvenile shellfish are damaged by harmful plankton and the survival rate is remarkably lowered. Therefore, harmful plankton is removed and harmless plankton is included to some extent. It is desirable to be a thing. Here, the harmful plankton refers to those having a body length of 800 to 1200 microns, a diameter of 300 to 400 microns, and an egg diameter of 70 to 90 microns.

  The base 1 is formed by assembling a plurality of steel or stainless steel rods. Specifically, the rod-shaped body is formed by being assembled into a quadrangular prism shape, and the treated water supply unit installation unit 2 in which the treated water supply unit 20 is provided, and extends outward from one side of the treated water supply unit installation unit 2. The filter body installation part 3 in which the filter body 10 is installed is provided. The filter body installation portion 3 is formed with a recess 4 having an internal thread 4a formed on the inner peripheral surface.

  The filter body 10 is formed in a bowl shape having a semicircular cross section, and is detachably installed on the filter body installation portion 3 of the base 1. Specifically, the filter body 10 is formed with a flange portion 11 that abuts the filter body setting portion 3, and a male portion that engages with the female screw 4 a of the recess portion 4 is formed in a portion corresponding to the recess portion 4 of the flange portion 11. A through hole 11a through which the screw 12 having the screw 12a is inserted is formed. That is, the filter body 10 has the flange portion 11 in contact with the filter body setting portion 3, the screw 12 is inserted into the through hole 11 a, and the male screw 12 a of the screw 12 is screwed into the female screw 4 a of the filter body setting portion 3. It is attached to the filter body installation part 3 by combining.

  Further, the filter body 10 has a net-like filter 16 that is inclined with the tip 13 positioned below the base end 14 so that the treated water W flows down and that filters the treated water W flowing down to the bottom surface 15. It has a discharge port 17 for discharging the treated water W flowing down to the tip 13 side as drainage Wb. Specifically, a through hole (not shown) is formed in the bottom surface 15 of the filter body 10, and a filter 16 is fitted and integrally formed in the through hole (not shown).

  In the embodiment, four filter bodies 10 are provided, and the four filter bodies 10 are arranged apart from each other so as to receive the treated water W that has passed through the filter 16 of each filter body 10 sequentially. The uppermost filter body 10a and the lowermost filter body 10b are installed so that the inclination angle becomes gentle. In addition, the inclination angle of each filter body 10 can be set within a range of 1 ° to 89 ° depending on the nature of the treated water W.

  Moreover, the filter 16 of each filter body 10 is formed of stainless steel or steel, and the roughness of the eyes is a filter provided on the lowermost filter body 10b from the filter 16 provided on the uppermost filter body 10a. It is set to become finer in the order of 16. The coarseness of the filter 16 of each filter body 10 can be set according to the nature of the treated water W and the size of foreign matter to be removed. For example, the filter 16 is set so that the roughness of the eyes is 2 mm to 1 mm, 1 mm to 0.5 mm, 0.5 mm to 475 μm, 475 μm to 218 μm, 218 μm to 104 μm, 104 μm to 55 μm, 55 μm to 35 μm, 35 μm to 25 μm. Can be used.

  The treated water supply unit 20 sucks the treated water W, aerates and ejects it, and a pump 21 that has an axis extending in the vertical direction and has a closed lower end 22a, and is ejected from the pump 21 in the middle. The inflow port 23 into which the treated water W is introduced is formed, and the outflow port 24 for supplying the treated water W introduced from the inflow port 23 to the uppermost filter body 10a is formed above the inflow port 23. A cylindrical body 22 is provided.

  The pump 21 is provided outside the base 1 and is provided in a treated water storage tank 60 in which treated water W is stored. The pump 21 is connected to the inlet 21 of the cylinder 22 and the treated water delivery pipe 25 for sending the treated water W from the pump 21 to the inlet 23 of the cylinder 22 and ejecting it, and the treated water. An air intake pipe 26 for taking in air outside the storage tank 60 into the pump 21 is provided.

  The cylindrical body 22 is formed in a hollow cylindrical shape, and is installed in the treated water supply unit installation unit 2 of the base 1. On the lower end 22 a side of the cylindrical body 22, a drain pipe 27 that discards foreign matter that has sunk in the cylindrical body 22 to the outside of the cylindrical body 22 is provided. The drain pipe 27 is provided with an open / close valve 28 that opens and closes to permit or disable the flow of foreign matter in the cylindrical body 22 to the drain pipe 27.

  Further, in the multistage filtration device S of the present invention, a lead-out path that leads to the outside of the base 1 the waste water Wb that is connected to the discharge ports 17 of the respective filter bodies 10 and that is discharged from the discharge ports 17. A body 30 is provided. The lead-out path body 30 is formed in a bowl shape having a semicircular cross section, and is arranged so as to extend to one side outward of each filter body 10 in a direction orthogonal to the longitudinal direction of each filter body 10. Yes.

  Further, an aggregation path body 40 is arranged in parallel on the outer side and below one side of the lowermost filter body 10b so as to collect and drain the drainage water Wb derived from each of the outlet path bodies 30.

  Furthermore, on the upper side of the uppermost filter body 10a, a splash prevention screen 50 that receives and passes the treated water W flowing out from the outlet 24 of the cylindrical body 22 and prevents the treated water W from being scattered is provided. . The scattering prevention screen 50 is made of a metal or resin and has a triangular cross section and is arranged in parallel at a predetermined interval, and the rod-shaped member 51 is provided at both ends of the rod-shaped member 51. A rod member 52 having an axis in a direction orthogonal to the axis is configured, and the rod-shaped members 51 are connected by the rod member 52 to form a fence shape.

  Further, in the multistage filtration device S, the filtered water Wa filtered by the lowermost filter body 10b is stored in a direction parallel to the longitudinal direction of the filter body 10 and immediately below the lowermost filter body 10b. A filtered water storage tank 70 is provided.

  Therefore, when using the multistage filtration apparatus S according to this embodiment to filter seawater as the treated water W containing foreign substances such as microorganisms such as plankton and solids, treated water in the treated water storage tank 60 is treated. W is supplied to the uppermost filter body 10a by the treated water supply unit 20.

  Specifically, the treated water W in the treated water storage tank 60 is sucked by the pump 21. At this time, since air is taken into the pump 21 from the air intake pipe 26, the treated water W and the air are aerated in the pump 21, and thereby foreign matter that is lighter than water such as plankton contained in the treated water W. Will stick to the air. The aerated treated water W is ejected from the inlet 23 of the cylindrical body 22 through the treated water delivery pipe 25 toward the inside of the cylindrical body 22. In this case, since the lower end 22a of the cylinder 22 is closed, most of the treated water W rises spirally in the cylinder 22 and flows out from the outlet 24, and the uppermost filter body 10a. To be supplied.

  At this time, since the treated water W ejected from the pump 21 is aerated in the pump 21, foreign matter lighter than water such as plankton contained in the treated water W adheres to the air and the cylinder 22 together with the treated water W. Going up inside. Microorganisms and solids heavier than the water contained in the treated water W sink and accumulate on the lower end 22a side of the cylindrical body 22 together with a part of the treated water W.

  Foreign matter heavier than the water sinking in the cylindrical body 22 and a part of the treated water W are accumulated in the cylindrical body 22, and when accumulated to some extent, the opening / closing valve 28 is opened and the drain pipe 27 is opened in a timely manner. Foreign matter and treated water W are taken out and discarded.

  And the treated water W which flowed out from the outflow port 24 of the cylinder 22 is received by the scattering prevention screen 50, passes through this, and is supplied to the uppermost filter body 10a. By passing the splash prevention screen 50, it is possible to prevent the treated water W flowing out from the outlet 24 from being scattered outside the base 1, so that the treated water W from the outlet 24 is surely filtered at the highest level. The body 10a can be supplied. Further, if the treated water W is supplied directly from the outlet 24 to the filter body 10, the filter 16 may be adversely affected by the water pressure of the treated water W or large foreign matter, but the treated water W is received once by the scattering prevention screen 50. The filter 16 can be protected by supplying the filter body 10 to the filter body 10.

  The treated water W supplied to the uppermost filter body 10 a is filtered by the filter 16 of the uppermost filter body 10 a, passes through the filter 16, and is sent to the lower filter body 10. In this way, the lower filter body 10 is sequentially passed through the lower filter body 10b, and is filtered by the filter 16 of the lower filter body 10b and stored in the filtrate storage tank 70, and the filtrate water Wa. As taken out. At this time, the filter 16 of the filter body 10 is formed so that the mesh of the filter 16 becomes finer in order from the filter 16 of the uppermost filter body 10a to the filter 16 of the lowermost filter body 10b. The contained foreign substances are removed in order from the largest.

  On the other hand, the waste water Wb containing the foreign matters remaining on the filter 16 after being filtered by each filter body 10 naturally flows down due to the inclination of each filter body 10 and is pushed away toward the tip 13 side by the water pressure of the treated water W that is sequentially sent. And discharged from the discharge port 17 as waste water Wb. That is, the waste water Wb filtered by the filter 16 of each filter body 10 and remaining on the filter 16 is caused by the inclination of the filter body 10 and the water pressure of the treated water W that is sequentially fed to the front end 13 side of each filter body 10. And discharged from the discharge port 17. At this time, since the filter body 10 is formed in a bowl shape with a semicircular cross section, the waste water Wb is converged on the central axis extending in the longitudinal direction of the filter body 10, and therefore, sequentially sent processing. Since the waste water Wb can be surely pushed away to the tip 13 side of the filter body 10 by the water W, the waste water Wb can be reliably discharged from the discharge port 17.

  The drainage water Wb discharged from the discharge port 17 is led out to the aggregated road body 40 through each lead-out path body 30, collected at the aggregated path body 40, and discharged to the outside of the base 1. As a result, the waste water Wb can be reliably discharged to the outside of the base 1, so that the filtered water Wa and the waste water Wb are not mixed. Therefore, the filtered water Wa and the waste water Wb are removed from the treated water W. You can definitely get it. In addition, since the outlet path 30 is disposed in a direction orthogonal to the longitudinal direction of each filter body 10 and extends to one side outward of each filter body 10, the drainage Wb is disposed in the longitudinal direction of each filter body 10. In the direction perpendicular to the filter body 10 and led out to one side outward of each filter body 10, so that it becomes possible to more reliably prevent the mixing of the filtered water Wa and the drainage water Wb. The filtered water Wa and the waste water Wb can be obtained from the treated water W even more reliably. Furthermore, since the aggregated path body 40 is arranged side by side on the outer side and below the lowermost filter body 10b, the apparatus S can be made compact.

  In this case, in the upper filter body 10, the foreign matter filtered by the filter 16 of the filter body 10 is relatively large, so the foreign matter tends to stay, but the inclination angle of each filter body 10 is the highest Since the filter body 10a is arranged so as to be loose in the order of the lowermost filter body 10b, that is, the inclination angle of the filter body 10 is varied in accordance with the roughness of the eyes of the filter 16, In the upper filter body 10, since the inclination angle of the filter body 10 is relatively steep, the speed at which the drainage water Wb naturally flows is increased, so that foreign matters are quickly washed away. It is possible to prevent the filter 16 from being clogged. For this reason, as much as there is no clogging, the filtration capacity of the treated water W can be secured as much as possible in the upper filter body 10 and the filtration efficiency can be improved. In addition, since the filter 16 can be prevented from being clogged with foreign substances, even when a large amount of treated water W is supplied, the filtration process can be performed with high accuracy.

  In addition, since the treated water W that has flowed out from the outlet 24 is received and passed by the scattering prevention screen 50, the scattering prevention screen 50 can remove a certain amount of foreign matter and supply it to the filter body 10. The filtration efficiency of the treated water W can be further improved.

  Furthermore, since the treated water W is filtered by the filter body 10 after removing microorganisms and solids heavier than the water contained in the treated water W in the treated water supply unit 20, the filtration efficiency of the treated water W is further improved. Can be made.

  If filtration of the treated water W is repeated several times, the filter body 10 becomes dirty or deteriorates. In this case, the filter body 10 is removed from the base 1 and maintenance is performed. That is, when the filter body 10 becomes dirty, the filter body 10 can be removed from the base 1 and cleaned, so that the filter body 10 can be easily cleaned, and when the filter body 10 has deteriorated. Since the filter body 10 can be easily replaced by removing the deteriorated filter body 10 and attaching a new filter body 10, the maintenance of the filter body 10 can be easily performed. In particular, since the filter 16 is easily contaminated or deteriorated, the filter 16 can be easily cleaned or replaced, so that the maintenance of the apparatus S can be easily performed.

  The filtered water Wa thus obtained is free of foreign substances such as microorganisms such as harmful plankton and solid matter, and can be used, for example, when cultivating sea cucumbers and the like. That is, since the multistage filtration device S can easily and reliably turn seawater into aquaculture water, the aquaculture water can be obtained relatively inexpensively and easily. Moreover, since the thing from which the plankton etc. were removed among the waste_water | drain Wb can be utilized for fish food etc., the waste_water | drain Wb can also be reused and is economical.

  6 and 7 show a multistage filtration apparatus S according to another embodiment of the present invention. This is different from the above embodiment in the configuration of each filter body 10. The filter body 10 has a main body 18 in which a front end 13a is positioned below the base end 14a so that the treated water W flows down and is inclined, and a bottom surface 15a is formed with a through hole 18a closed by the filter 16a; It comprises a mesh-like filter 16a that is detachably provided to the main body 18 and filters the treated water W flowing down, and a grid-like reinforcing frame 19 to which the filter 16a is attached.

The main body 18 is formed in a bowl shape having a semicircular cross section, and is detachably installed on the filter body installation portion 3 of the base 1. The attachment and detachment of the main body 18 with respect to the filter body installation part 3 are the same as in the above embodiment.
The filter 16 a is formed in a bowl shape that fits inside the main body 18, and is sized to cover the inside of the main body 18. The coarseness of the filter 16a can be set similarly to the above embodiment. When the filter 16 a is held by the main body 18, the filter 16 a is fitted inside the main body 18. In this case, since the filter 16a is only fitted inside the main body 18, the filter 16a can be easily attached to the main body 18, and the filter 16a can be reliably held by the main body 18 because it is fitted. Moreover, since the filter 16a is formed larger than the through-hole 18a, the filter 16a can be easily attached to the main body 18 also in this respect.
The reinforcing frame 19 is formed in a bowl shape that fits inside the main body 18 and is provided with a filter 16a inside. The reinforcing frame 19 is formed in a lattice shape in which metal rod-like bodies are arranged vertically and horizontally at predetermined intervals. The reinforcing frame 19 is not necessarily provided, and only the filter 16a may be attached.
Other configurations are the same as those in the above embodiment.

  When the multistage filtration apparatus S according to this other embodiment is used, the treated water W supplied from the treated water supply unit 20 to the uppermost filter body 10a is filtered by the filter 16a of the uppermost filter body 10a. Then, it passes through the reinforcing frame 19 and is received by the bottom surface 15a of the main body 18, flows down the bottom surface 15a of the main body 18, passes through the through hole 18a, and is sent to the lower filter body 10. In this way, the lower filter body 10 is sequentially passed through the lower filter body 10b, and is filtered by the filter 16a of the lower filter body 10b to be taken out as filtered water Wa.

  At this time, since the filter 16a is formed in a bowl shape, the drainage Wb converges on the central axis extending in the longitudinal direction of the filter 16a. Therefore, the drainage Wb is filtered by the treated water W sent sequentially. Since the drainage Wb can be surely discharged from the discharge port 17a, the filter 16a can be reliably clogged by foreign matter in the drainage Wb. Can be prevented. In addition, since the main body 18 is also formed in a bowl shape, the treated water W received on the bottom surface 15a of the main body 18 is focused on the central axis extending in the longitudinal direction of the main body 18, and thus the treated water is surely treated. W can be sent to the lower filter body 10 from the through hole 18a.

  Further, since the strength of the filter 16a can be improved by the reinforcing frame 19, the filter 16a can be used for a long period of time, and the cost can be reduced accordingly. Furthermore, since the reinforcing frame 19 has a lattice shape, it does not obstruct the passage of the treated water W.

  If filtration of the treated water W is repeated several times, the filter body 10 becomes dirty or deteriorates. In this case, the filter body 10 is removed from the base 1 and maintenance is performed. In particular, since the filter 16a is easily contaminated or deteriorated, the filter 16a is removed from the main body 18 for maintenance. When removing, it is only necessary to remove the filter 16a from the main body 18, and it can be easily removed. Further, since the filter 16a is formed larger than the through hole 18a, the filter 16a can be easily detached from the main body 18 in this respect.

That is, when the filter 16a becomes dirty, the filter 16a can be removed from the main body and cleaned, so that the filter 16a can be easily cleaned. When the filter 16a is deteriorated, the deteriorated filter 16a is removed. Since the filter 16a can be easily replaced by attaching a new filter 16a, the maintenance of the filter 16a can be easily performed. Moreover, since the main body 18 can also be removed from the base 1, the main body 18 and the filter 16a can be further easily maintained by removing the main body 18 from the base 1 and performing maintenance.
Other operations and effects are the same as in the above embodiment.

In addition, in the said embodiment, although the filter body 10 was formed in the cross-sectional semicircle shape, it is not necessarily limited to this, For example, you may form in a cross-sectional V shape, and it changes suitably. There is no problem.
Moreover, in the said embodiment, although the filter 16 was formed with stainless steel or steel, it is not necessarily limited to this, For example, you may form with resin and a nonwoven fabric, and it does not interfere, changing suitably.

S Multi-stage filter device W Treated water Wa Filtered water Wb Drainage 1 Base 2 Treated water supply part installation part 3 Filter body installation part 4 Recess 10 Filter body 10a Uppermost filter body 10b Lowermost filter body 11 Gutter part 12 Screw 13 Tip 14 Base 15 Bottom 16 Filter 17 Discharge port 18 Main body 18a Through hole 19 Reinforcement frame 20 Treated water supply unit 21 Pump 22 Tube 23 Inlet 24 Outlet 25 Treated water delivery pipe 26 Air intake pipe 27 Drain pipe 28 Open / close Valve 30 Derived path body 40 Aggregated path body 50 Scattering prevention screen 51 Bar-shaped member 52 Saddle member 60 Treated water storage tank 70 Filtration water storage tank

Claims (10)

Drain the treated water that has flowed to the tip side with a net-like filter that is provided on the base and is tilted so that the treated water flows down and the tip is positioned below the proximal end and filters the treated water flowing down to the bottom. A plurality of filter bodies each having a discharge port for discharging the plurality of filter bodies, the plurality of filter bodies being arranged vertically apart so as to sequentially receive treated water that has passed through the filters of the respective filter bodies. The coarseness of the filter is made finer in the order of the filter provided on the uppermost filter body to the filter provided on the lowermost filter body, and the uppermost filter body is changed by the treated water supply unit. In a multi-stage filtration apparatus that supplies treated water and takes out water that has passed through the lowermost filter body as filtered water,
The multi-stage filter device, wherein the plurality of filter bodies are installed such that the inclination angle becomes gentle in order from the uppermost filter body to the lowermost filter body.   2. The multistage filtration device according to claim 1, wherein the filter body is formed in a bowl shape having a semicircular cross section.   A pump that sucks the treated water and aerates and ejects the treated water supply unit, and a treatment that is formed in a hollow cylindrical shape having an axis extending in the vertical direction and closed at the lower end, and ejected from the pump in the middle An inflow port into which water is introduced, and a cylindrical body in which an outflow port for supplying treated water introduced from the inflow port to the uppermost filter body is formed above the inflow port. The multistage filtration apparatus according to claim 1 or 2, wherein the multistage filtration apparatus is characterized.   4. A splash prevention screen provided on the upper side of the uppermost filter body for receiving and passing treated water flowing out from the outlet of the cylindrical body and preventing splashing of treated water. Multistage filtration device.   5. The multistage filtration device according to claim 1, wherein each of the filter bodies is detachably installed on the base.   A lead-out path body that is connected to the discharge port of each filter body and is connected to the discharge port of each of the filter bodies and leads out the drainage discharged from the discharge port to the outside of the base board, and from each of the lead-out path bodies 6. A multistage filtration apparatus according to claim 1, further comprising an aggregate path body that collects and discharges the drained water. The lead-out path body is disposed so as to extend in the direction perpendicular to the longitudinal direction of each filter body and to one side outward of each filter body,
7. The multistage filtration apparatus according to claim 6, wherein the aggregated path bodies are arranged side by side on the outer side and below the lowermost filter body.   2. The filter according to claim 1, wherein each of the filter bodies includes a main body having a through hole that is closed by a filter on the bottom surface, and the filter is provided to be removable from the main body. 7. The multistage filtration device according to any one of 7.   9. The multistage filtration device according to claim 8, wherein the main body is formed in a bowl shape, and the filter is formed in a hook shape that fits inside the main body.   The multistage filtration device according to claim 8 or 9, wherein the multistage filtration device is provided with a grid-like reinforcing frame to which the filter is attached.

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