JP2011016037A - Rotary filter plate type filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new rotary filter plate type filter capable of removing solid components efficiently and continuously over a long period of time.SOLUTION: The rotary filter plate type filter 10 includes: a pair of filter plates 13 fixed thereto forming a filter chamber 12 with a given space set in the axial direction; a pair of disc-like chamber plates 15 fixed to the rotary shaft 11 to form filtrate chambers 14 with given spaces at the outside of the pair of filter plates 13, respectively; a housing 16 fixed to a base 16A to surround the whole chamber plates 15; a scraper 17 disposed in the filter chamber 12 and fixed to the housing 16 to scrape a cake layer deposited on filter surfaces of the pair of filter plates 13, a slurry feed means 18 feeding slurry S1 into the filter chamber 12; a liquid discharge means 19 discharging filtrate L from the filtrate chamber 14 to the outside of the chamber plates 15; and a sludge discharge means 20 discharging the sludge S2 scraped by the scraper 17, on its rotary shaft 11.

Description

  The present invention relates to a rotary filter type filter, and more particularly to a rotary filter type filter capable of continuously operating by scraping a cake layer deposited on the filter plate.

  As a filter, for example, a batch filtration method such as a vertical filter pressure filter, a horizontal filter pressure filter, a continuous drum pressure filter, a hollow fiber membrane separator, and a slurry circulation pressure filter. There is a continuous filtration system such as a filter. For example, when the solid component contained in the liquid to be treated such as ultra-high purity water is efficiently and surely removed, the latter continuous filtration method is often used. In continuous processing using a separation membrane, a so-called cross flow in which the flow direction of the liquid to be processed and the filtration direction cross each other.

  Here, a slurry circulation type pressure filtration type filter using a cross flow is taken as an example, and the principle thereof will be described with reference to FIG. As shown in FIG. 7, this filter has a container 1 and a separation membrane 2 that partitions the inside of the container 1 into a filtration chamber 1A and a filtrate chamber 1B, a circulation pipe 3 connected to the filtration chamber 1A, and a filtrate chamber 1B. And a formed discharge pipe 4. The slurry is pressurized to, for example, 0.2 MPa, flows into the filtration chamber 1A from the circulation pipe 3, and flows and circulates in the direction of arrow X in the filtration chamber 1A. The slurry is filtered in the direction of arrow Y by the separation membrane 2 while passing through the filtration chamber 1A, and the filtrate is continuously stored in the filtrate chamber 1B.

  However, in the case of conventional cross-flow filtration, solid components can be removed from the slurry to obtain a high-purity liquid, but the cake layer consisting of solid components deposited on the surface of the separation membrane is removed by the flow of the slurry. Therefore, the efficiency of removing the cake layer is low, the cake layer cannot be removed efficiently only by the flow of the slurry, the separation membrane is easily clogged, and the number of maintenance operations such as washing increases, resulting in a result. In particular, there was a problem that the operating efficiency of the filter was poor.

  The present invention has been made in order to solve the above-mentioned problems, and it is possible to efficiently and continuously remove solid components over a long period of time, and thus to improve operational efficiency. The purpose is to provide a machine.

  The rotary filter plate type filter according to claim 1 of the present invention is formed by being partitioned by a pair of circular filter plates fixed on the rotary shaft at a predetermined interval in the axial direction and the pair of filter plates. A circular filtration chamber and a filtrate chamber, a housing fixed to a base so as to surround the filtration chamber and the filtrate chamber, and the pair of filter plates in the filtration chamber while the rotating shaft rotates. A scraper extending from the rotating shaft to the outer peripheral edge of the filtration chamber so as to scrape the cake layer deposited on the filtration surface of the filter, and an integrated unit with the scraper so as to fix the scraper to the housing. A fixing member, a supply means for supplying the liquid to be treated to the filtration chamber, a first discharge means for discharging the filtrate from the filtrate chamber, and a first discharge means for discharging the solid component scraped by the scraper. 2 discharge means The first discharging means has a flow path provided in the rotating shaft so as to communicate with the filtrate chamber and discharge the filtrate, and the second discharging means passes through the housing and passes to the scraper. It has the discharge path which communicates, It is characterized by the above-mentioned.

  The rotary filter plate type filter according to claim 2 of the present invention is the rotary filter plate type filter according to claim 1, wherein a plurality of the pair of filter plates are arranged at predetermined intervals on the rotary shaft. It is what.

  According to a third aspect of the present invention, there is provided a rotary filter plate type filter according to the first or second aspect, further comprising a first circulation means for circulating the liquid to be treated to the filtration chamber. It is characterized by this.

  Moreover, the rotary filter plate type filter of Claim 4 of this invention is the invention of any one of Claims 1-3. WHEREIN: The said solid component scraped off with the said scraper is the said filtration. A second circulating means for circulating to the chamber is provided.

  According to the present invention, it is possible to provide a rotary filter type filter that can efficiently and continuously remove solid components over a long period of time, and that can improve the operation efficiency.

It is sectional drawing which shows the internal structure of one Embodiment of the rotary filter type filter of this invention. (A), (b) is a figure which shows the rotary filter type filter shown in FIG. 1, respectively, (a) is sectional drawing of the whole, (b) is sectional drawing which expands and shows the principal part of (a). is there. It is a block diagram which shows an example of the filtration system using the rotary filter plate type filter shown in FIG. It is a side view equivalent to FIG. 1 which shows other embodiment of the rotary filter plate type filter of this invention. It is a side view equivalent to FIG. 1 which shows other embodiment of the rotary filter type filter of this invention. (A), (b) is a figure which respectively shows the rotary filter type filter shown in FIG. 5, (a) is sectional drawing equivalent to (a) of FIG. 2, (b) is a filter plate of (a). It is sectional drawing expanded and shown. It is a conceptual diagram which shows an example of the conventional pressure filtration type filter of a slurry circulation system. It is.

  Hereinafter, the present invention will be described based on the embodiment shown in FIGS.

First Embodiment A rotary filter plate type filter (hereinafter simply referred to as a “filter”) 10 according to the present invention is provided on a rotary shaft 11 in the axial direction as shown in FIGS. A pair of filter plates 13 fixed at a predetermined interval to form a filtration chamber 12 and a filtrate chamber 14 formed at a predetermined interval outside the pair of filter plates 13 are fixed to the rotating shaft 11. A pair of rotating disk-shaped chamber plates 15, a housing 16 that surrounds the entire chamber plate 15 and is fixed to a base 16 </ b> A (see FIG. 1), and a pair of filter plates 13 that are disposed in the filtration chamber 12. And a scraper 17 for filtering a cake layer (not shown) deposited on the filtration surface by filtering the liquid to be treated (for example, slurry) S1 containing a solid component composed of fine particles having a particle size of 1.0 μm or less, and the like. Slurry supply for supplying the slurry S1 into the filtration chamber 12 Means 18, first discharge means (hereinafter referred to as “filtrate discharge means”) 19 for discharging filtrate L from filtrate chamber 14, and second discharge means for discharging sludge S 2 scraped by scraper 17 ( (Hereinafter referred to as “sludge discharging means”) 20, and is configured to filter the slurry S <b> 1 in the filtration chamber 12 at a pressure of 0.2 Mpa, for example.

  The pair of filter plates 13 and the pair of chamber plates 15 form a filtration chamber 12 and a filtrate chamber 14, and a filtrate chamber 14 is formed on both sides of the filtration chamber 12. The filtration chamber 12 is set to have a pressure higher than that of the filtrate chamber 14 (normal pressure), for example, and pressure-filters the slurry S1 by the pressure difference between the filtration chamber 12 and the filtrate chamber 14. Further, the filtrate chamber 14 can be set to a pressure lower than that of the filtration chamber 12 and filtered under reduced pressure.

  The rotating shaft 11 passes through the center of the pair of chamber plates 15 and the housing 16 as shown in FIG. 2A, obtains the driving force of the motor as a driving source, and the pair of filter plates 13 in the housing 16. And the chamber plate 15, that is, the filtration chamber 12 and the filtrate chamber 14, are rotated at a predetermined rotation speed (for example, 1 rpm). At this time, since the pressurized slurry S1 is supplied to the filtration chamber 12 and the filtrate chamber 14 is at atmospheric pressure, the slurry S1 is pressure-filtered, and the solid component adheres and accumulates on the filter plate 13, The filtrate L flows into the filtrate chamber 14. As shown in FIG. 5B, the filter plate 13 is a metal plate having a filter medium 13A for filtering the slurry S1, a metal plate covered with the filter medium 13A, and a plurality of flow holes (not shown) formed in a predetermined pattern. And a support plate 13B such as a resin plate or a ceramic plate, the slurry S1 in the filtration chamber 12 is pressure-filtered by the filter medium 13A, and the filtrate L passes through the numerous flow holes of the support plate 13B. To reach. As the filter medium 13A, for example, a known filter medium such as a UF film, an MF film, a ceramic film, a filter cloth, and filter paper is used.

  As shown in FIG. 1 and FIG. 2A, the rotary shaft 11 is formed with a flow path through which the filtrate L obtained by filtering the slurry S1 in the filtration chamber 12 through the pair of filter plates 13 flows. The filtrate discharging means 19 includes, for example, a first flow path 11A formed beyond the position where the pair of filter plates 13 are disposed from the end surface along the axis of the rotary shaft 11, and the first flow path 11A. A second flow path 11B formed in the radial direction of the rotary shaft 11 so as to open at an intermediate position between the pair of filter plates 13. A plurality of second flow paths 11 </ b> B are formed on the circumferential surface of the rotating shaft 11 at equal intervals in the circumferential direction.

  As shown in FIG. 2A, an annular flow path forming member 21 that forms a flow path that connects the second flow path 11 </ b> B and the filtration chamber 12 is attached to the rotating shaft 11. The flow path forming member 21 includes a thick annular surface portion and annular protrusions formed on the outer peripheral edge portions of both surfaces of the annular surface portion so as to protrude to a position beyond the pair of left and right filter plates 13. A plurality of first flow paths 21A corresponding to the plurality of second flow paths 11B of the rotary shaft 11 are radially formed on the annular surface portion so as to reach the annular protrusion from the inner peripheral surface thereof. In the annular protrusion, a plurality of second flow paths 21B are formed in the circumferential direction so as to intersect with each of the plurality of first flow paths 21A. The annular protrusion has a narrower width toward the outer side in the radial direction of the flow path forming member 21, and both side surfaces are formed as tapered surfaces. The second flow path 21 </ b> B penetrates the annular protrusion in the axial direction, opens at the left and right tapered surfaces, and the filtrate L toward the center of the filtration chamber 12 easily flows in.

  That is, the filtrate discharge means 19 is formed by the first and second flow paths 11A and 11B of the rotating shaft 11 and the first and second flow paths 21A and 21B of the flow path forming member 21, and the filtrate chamber 14 The filtrate L is discharged from the tank.

  As shown in FIG. 2A, an annular spacer 22 formed at a predetermined interval is fixed between the pair of filter plates 13 on the outer peripheral surface of the flow path forming member 21 by, for example, screwing. Is located at the inner peripheral edge of the pair of filter plates 13.

  As shown in FIG. 2A, an inner annular protrusion 15A and an outer annular protrusion 15B are formed on the inner peripheral edge and the outer peripheral edge of the inner surface of the chamber plate 15, respectively. The pair of inner annular protrusions 15A sandwich the annular surface portion of the flow path forming member 21, and the outer peripheral surfaces of the inner annular protrusions 15A are in close contact with the inner peripheral surface of the annular protrusion of the flow path forming member 21. Further, a pair of annular filter plate pressing members 23 for holding the filter plate 13 are disposed on the inner surfaces of the pair of outer annular projections 15B, and the filter plate pressing members 23 and the outer circumferential side annular projections 15B are respectively bolted and filtered. The outer peripheral edge of the plate 13 is sandwiched. Between the pair of filter plate pressing members 23, an interval having the same dimension as the interval by the spacer 22 is formed over the entire circumference.

  Further, as shown in FIG. 2A, annular outer frames 24 and 25 are arranged on the outer peripheral surfaces of the pair of chamber plates 15 and the filter medium pressing member 23, respectively. The outer peripheral surface is formed. The outer frame 25 is interposed between the left and right outer frames 24 and seals the gap formed at the outer peripheral ends of the pair of filter plates 13 to form the filtration chamber 12. A sliding member (for example, a resin ring) 26 that also serves as a sealing member is provided on the inner peripheral surface of the outer frame 25, and the filtration chamber 12 and the filtrate chamber 14 are disposed in the housing 16 via the resin ring 26. It is free to rotate. An O-ring 27 is interposed between the inner surface of the outer frame 24 and the outer surface of the outer frame 25 to keep the filtration chamber 16 airtight. A resin ring 28 is interposed between the inner peripheral surface of the outer frame 24 and the outer peripheral surface of the chamber plate 15.

  As shown in FIG. 1, through holes 29 are formed in a plurality of locations in the outer frame 25 and the filter medium pressing member 23, and all of these through holes 29 are opened in the filtration chamber 12. A slurry supply pipe 30 as the slurry supply means 18 is inserted at one place. The slurry supply pipe 30 is inserted into the filtration chamber 16 from the outer frame 25, and the sealed tip reaches the vicinity of the spacer 22. A plurality of nozzles (not shown) are attached to the side surface of the slurry supply pipe 30 at predetermined intervals in the longitudinal direction. The slurry S1 is sprayed from the plurality of nozzles toward the rotation direction of the filter plate 13 and filtered. The chamber 12 is filled with the slurry S1, and the slurry S1 is filtered by a cross flow in the filter plate 13. A scraper 17 is disposed on the left side of the slurry supply pipe 30. The other through-holes 29 can be used for mounting a pressure sensor (not shown) for detecting the pressure in the filtration chamber 12, or can be used as an inlet / outlet of the slurry S1 when the slurry S1 is circulated. The unused through hole 29 is sealed.

  As shown in FIG. 1, the scraper 17 includes a pair of extending portions that are curved in a counterclockwise direction in the radial direction of each of the pair of filter plates 13 from an annular portion that fits around the outer periphery of the spacer 22 of the filter plate 13. It has a curved plane part, and a pair of curved plane parts are arranged in parallel with each other, and are connected by connecting members (not shown) such as screws at a plurality of places so as to be held in parallel and integrated. Then, a scraper knife 17A is formed on the side surface of the pair of curved flat members facing the rotation of the filter plate 13 as shown in FIG. 2B, and the filter plate 13 is rotated while the chamber is rotated by the scraper knife 17A. The deposit (cake layer) C is scraped off in contact with the filtration surface. Further, a separator 17B is formed on the side surface of the pair of curved flat surface portions on the side where the rotation of the filter plate 13 is sent, and the separator 17B partitions the slurry side and the sludge side so that the slurry S1 does not easily enter the scraper 17 side. Yes. Unlike the scraper knife 17A, the separator 17B is formed as a flat side surface that forms a gap between the separator 17B and the filter plate 13. Note that the arrows shown in FIG. 2B indicate the rotation direction of the filter plate 13.

  As shown in FIG. 1, a scraper fixing member 17C that extends in a radial direction from an annular portion of the scraper 17 and fixes the scraper 17 to the housing is formed at a position spaced apart by a predetermined angle in the clockwise direction of the scraper 17. Hereinafter, the region into which the slurry S1 flows is referred to as a slurry region 12A, and the region in which the sludge S2 is collected is referred to as a sludge region 12B.

  The scraper 17 and the scraper fixing member 17C are integrated via an annular portion. The scraper fixing member 17C is connected and fixed to the outer frame 25 of the housing 16 at its outer end by a connecting member (not shown) such as a bolt. Therefore, the cake layer on the filtration surface of the filter plate 13 can be scraped off by the scraper 17 while the filtration chamber 12 and the filtrate chamber 14 are rotated.

  As shown in FIGS. 1 and 2, a block 31 positioned below the scraper 17 is fixed to the outside of the outer frames 24 and 25. The block 31 is formed with a through hole through which the slurry supply pipe 30 passes and a sludge flow path 31A communicating with the sludge region 12B. The sludge flow path 31 </ b> A penetrates the block 31 and communicates with the sludge region 12 </ b> B of the filtration chamber 12. The block 31 is formed with a sludge discharge path 31B orthogonal to the sludge flow path 31A. Here, sludge flow paths 31 </ b> A and 31 </ b> B are formed as the sludge discharge means 20. A valve 32 operated by a presser is inserted into one end of the sludge flow path 31A, and the valve 32 is operated by the pressure of the presser so that the sludge S2 is discharged from the sludge discharge path 31B. In FIG. 2A, reference numeral 33 denotes a bearing, and reference numeral 34 denotes a rotary joint. The rotary shaft 11 is rotatably supported by the bearing 33 and the rotary joint 34.

  Next, the operation will be described. Here, the one-pass process in which the slurry S1 is filtered only once through the filter 10 will be described as an example. First, when the filter 10 is started, the filtration chamber 12 and the filtrate chamber 14 rotate in the casing 16 through the rotating shaft 11 at a rotation speed of, for example, 1 rpm, and the slurry region 12A of the filtration chamber 12 from the slurry supply pipe 30. For example, the slurry S1 is supplied at a pressure of 0.2 MPa. In the slurry S1, solid components are filtered by the filter plate 13 in the filtration chamber 12, and the solid components adhere to the filtration surface to form a cake layer, and the filtrate L flows out to the filtrate chamber 14.

  At this time, since the chamber including the filtration chamber 12 and the filtrate chamber 14 is rotating slowly, the cake layer formed on the filtration surface of the filter plate 13 reaches the sludge region 12B from the slurry region 12A of the filtration chamber 12. In the sludge region 12B, the slurry S1 that has entered from the slurry region 12A is filtered and concentrated. In the sludge region 12B, the scraper knife 17A of the scraper 17 disposed at the downstream end scrapes the cake layer from the filtration surface of the filter plate 13. High concentration sludge S2 is recovered. When the sludge S2 is removed from the filtration surface, the filtration surface is renewed to recover the filtration performance of the filter plate 13 and reach the slurry region 12A to filter the next slurry S1.

  The filtrate L in the filtrate chamber 14 is discharged to the outside through the first and second flow paths 21A and 21B of the flow path forming member 21 and the first and second flow paths 11A and 11B of the rotating shaft 11, and is predetermined. The filtrate is collected by a filtrate collecting apparatus (not shown). On the other hand, the sludge S2 recovered in the sludge region 12B of the filtration chamber 12 is discharged to the outside from the sludge flow paths 31A and 31B via the valve 32 operated by the presser, and recovered by a predetermined sludge recovery device (not shown). Is done.

  As described above, according to the filter 10 of the present embodiment, a pair of circular filter plates 13 fixed to the rotary shaft 11 by forming the filtration chamber 12 at a predetermined interval in the axial direction, and a pair A pair of circular chamber plates 15 fixed to the rotating shaft 11 so as to form a filtrate chamber 14 at predetermined intervals on the outside of the filter plate 13 and a base 16A so as to surround the entire chamber plate 15. And a scraper disposed in the filtration chamber 12 and extending from the rotary shaft 11 to the outer peripheral edge of the filtration chamber 14 so as to scrape the cake layer deposited on the filtration surfaces of the pair of filter plates 13. 17, a scraper fixing member 17 </ b> C provided integrally with the scraper 17 so as to fix the scraper 17 to the housing 16, slurry supply means 18 for supplying the slurry S <b> 1 into the filtration chamber 12, A filtrate discharging means 19 for discharging the filtrate L from the liquid chamber 14 to the outside of the chamber plate 15 and a sludge discharging means 20 for discharging the sludge S2 scraped by the scraper 17 are provided. The filtrate discharging means 19 is provided in the filtrate chamber 14. The first and second flow paths 11 </ b> A and 11 </ b> B are provided in the rotary shaft 11 so as to discharge the filtrate L, and the sludge discharge means 20 passes through the outer frame 25 of the housing 16 and communicates with the scraper 17. Since the sludge flow paths 31A and 31B are provided, the slurry S1 supplied into the filtration chamber 12 is filtered by the filter plate 13 in the slurry region 12A while the filtration chamber 12 and the filtrate chamber 14 rotate in the housing 16. Even if a cake layer is formed on the filtration surface, the cake layer is scraped off by the scraper 17 in the downstream sludge region 12B, and the filtration surface is restored. The filtration performance of the filter plate 13 in the Lee region 12A can be maintained for a long time, the filtration can be performed efficiently and continuously for a long time, and the operating efficiency of the filter 10 can be improved. it can.

Second Embodiment In the first embodiment, the case where the slurry S1 is passed once and filtered has been described. However, in this embodiment, when the solid component is low in concentration and once filtered, FIG. As shown in FIG. 4, the slurry S1 and the sludge S2 are circulated, and the slurry S1 and the sludge S2 are repeatedly filtered to increase the sludge S2 to a desired concentration in a short time.

  Since the filter 10 of the first embodiment is also used in this embodiment, the description of the filter 10 is omitted, and the filter system in which the filter 10 is incorporated is shown in FIGS. 1 and 2 based on FIG. The explanation will be made with reference to FIG.

  As shown in FIG. 3, the filtration system 100 includes a filter 10 that filters the slurry S <b> 1, a slurry tank 40 that stores the slurry S <b> 1 that is supplied to the filter 10, and a filter 10 and the slurry tank 40. The sludge S2 is recovered from the first circulation pipe 50 for circulating the slurry S1, the second circulation pipe 70 for circulating the sludge S2 between the filter 10 and the first pump 60, and the second circulation pipe 70. A sludge drum 80 and a filtrate tank 90 that collects the filtrate L discharged from the filter 10 via a discharge pipe 91 are provided. While the filter plate is rotated by the motor M, the slurry S1 is added as described later. The sludge S2 is recovered by filtration and the filtrate L is recovered. In FIG. 3, PT is a pressure sensor.

  Thus, as shown in FIG. 3, the forward piping 50A of the first circulation piping 50 has one end connected to the slurry tank 40 and the other end connected to the slurry 18A via the valve 18A of the slurry supply means 18 of the filter 10. It is connected to a supply pipe 30 (see FIG. 1). One end of the return pipe 50 </ b> B of the first circulation pipe 50 is connected to the through hole 29 (see FIG. 1) of the filter 10, and the other end is connected to the slurry tank 40. A second pump 51 is provided in the vicinity of the slurry tank 40 of the forward piping 50A, and the slurry S1 is circulated between the filter 10 and the slurry tank 40 by the second pump 51, so that the solid component concentration and the slurry of the slurry S1 are circulated. The concentration of the solid component of S2 is gradually increased.

  Further, as shown in FIG. 3, the forward piping 70A of the second circulation piping 70 has one end connected to the first pump 60 and the other end connected to a sludge flow path (not shown) of the filter 10. Yes. One end of the return pipe 70 </ b> B is connected to the sludge discharge path (see FIG. 1) of the filter 10, and the other end is connected to the first pump 60. Further, in the forward piping 70A, a branch piping 70C is branched in the vicinity of the first pump 50. Valves 71 and 72 are provided in the forward piping 70A and the branch piping 70C, respectively, and the valve 71 is closed at the appropriate time and the valve 72 is opened to collect the sludge S2 reaching a desired concentration in the sludge drum 80.

  As shown in FIG. 3, a presser 32A for operating a valve that opens and closes a sludge discharge passage 31B of sludge is attached to the block 31 of the filter 10. The presser 32A is controlled by compressed air from a compressed air source 32B. The A washing water source 35 is connected to the through hole 29 of the filter 10 via a valve 35A. When the filter plate of the filter 10 is clogged, the washing water is supplied from the washing water source 35 into the filtration chamber 12. The filtration surface of the filter plate is washed. Further, the pressure in the filtration chamber 12 is detected by the pressure sensor PT, and a constant pressure is always maintained via the pressure sensor PT. Reference numeral 32C denotes a compressed air switching valve.

  Next, the operation will be described. When the filtration system 100 is started, the chamber is rotated at a predetermined speed via the rotating shaft 11 of the filter 10 and the second pump 51 is started to move the first from the slurry tank 40 to the filter chamber 12 of the filter 10. The slurry S1 is supplied through the circulation pipe 50. In the slurry region 12A of the filtration chamber 12, the slurry S1 is filtered, a cake layer is formed on the filtration surface of the filter plate, and the filtrate L flows out to the filtrate chamber 14. The cake layer on the filtration surface reaches the sludge region by the rotation of the filter plate, and the scraper 17 scrapes off the cake layer to generate sludge S2.

  The slurry S2 in the filtration chamber 12 returns to the slurry tank 40 via the first pump 51. While the slurry S1 in the slurry tank 40 repeatedly passes through the slurry region 12A via the first circulation pipe 50, the liquid content decreases and the solid component concentration of the slurry S1 gradually increases. During this time, the first pump 60 is started and the sludge S2 in the sludge area 12B circulates through the second circulation pipe 70, and the liquid content decreases by the amount of filtrate while the sludge S2 repeatedly passes through the sludge area 12B. The concentration of the solid component of the sludge S2 gradually increases. During this time, the filtrate L is recovered from the flow path of the rotating shaft 11 to the filtrate tank 90 via the discharge pipe 91.

  When the solid component of the sludge S2 reaches a predetermined concentration, the valves 71 and 72 are switched via the concentration sensor, the valve 71 is closed, and the valve 72 is opened to collect the sludge S2 from the sludge region 12B to the sludge drum 80. During this time, sludge S2 is gradually accumulated in the sludge region. When the collection of the sludge S2 is finished, the valves 71 and 72 are switched, and the sludge S2 in the sludge region 12B is circulated again through the second circulation pipe 70.

  When the filtration of the slurry S1 is continued and the filter plate is clogged, the slurry S1 and the sludge S2 are discharged from the filtration chamber 12, and then the washing water is supplied from the washing water source 35 into the filtration chamber 12 while rotating the chamber. The filter plate is washed to recover the filtration performance.

  As described above, according to the present embodiment, the first and second circulation pipes 50 and 70 are attached to the filter 10, and the slurry S1 and the sludge S2 are repeatedly filtered. Even if it is S1, a solid component can be removed reliably. In addition, also in this embodiment, the same effect as 1st Embodiment can be expected.

Third Embodiment As shown in FIG. 4, the filter 10 of the present embodiment is installed and used with the scraper 17 of the filter 10 of the first embodiment rotated 90 ° clockwise. Different from the first embodiment. Therefore, since the structure of the filter 10 is the same, the same reference numerals are given to the same or corresponding parts as those in the first embodiment as shown in FIG.

  As shown in FIG. 4, the filter 10 according to the present embodiment is installed by rotating the scraper 17 by 90 ° in the clockwise direction as compared with the filter 10 according to the first embodiment. First, the method of using the filter 10 is different from that of the embodiment.

  In the present embodiment, as shown in FIG. 4, the filter 10 and the slurry tank 40 are connected via a circulation pipe 50, and the slurry S <b> 1 is interposed between the slurry region 12 </ b> A of the filtration chamber 12 and the slurry tank 40 via the circulation pipe 50. The concentration of the solid component of the slurry S1 is gradually increased. Then, the horizontal surface of the slurry S1 in the filtration chamber 12 becomes substantially the same height as the center of the rotating shaft 11, and the slurry S1 is set to the same height as the center of the rotating shaft 11 from the outlet port where the slurry S1 is located. It is supposed to flow out to. Therefore, the slurry S1 overflows with the through hole 29 of the filtration chamber 12 as the outlet of the slurry S1.

  Since the downstream side of the through-hole 29 serving as the outlet of the slurry S1 in the filtration chamber 12 is the sludge region 12B, the sludge S2 recovered by the scraper 17 in the sludge region 12B is in a low liquid content state. This sludge S2 is guided to the sludge flow path 31A along the curved surface of the scraper knife 17A of the scraper 17, and is discharged from the sludge flow path 31A to the outside. The pressure in the filtration chamber 12 can be adjusted by operating the valve 32 by the presser.

  As described above, according to the present embodiment, the sludge S2 having a low liquid content can be recovered efficiently and continuously, and the same effects as those of the first embodiment can be expected.

4th Embodiment The filter 10 of 1st Embodiment has one chamber, and the filtration chamber 12 and the filtration chamber 12 are accommodated in the chamber. Since there is only one chamber, the processing capacity is low. On the other hand, in the filter 10A of the present embodiment, as shown in FIGS. 5 and 6A and 6B, the filtrate chamber 14 formed by the pair of filter plates 13 is in parallel with the rotary shaft 11. Are arranged to increase the processing capacity. Also in this embodiment, the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals and the present invention will be described.

  As shown in FIGS. 5 and 6A and 6B, for example, the filter 10A of the present embodiment includes a rotating shaft 11 and a plurality of filtrate chambers fixed to the rotating shaft 11 at predetermined intervals. 14, two scrapers 17, one separator 17 </ b> D and one slurry supply pipe 30 that are arranged in tandem in the gap between adjacent filtrate chambers 14, a plurality of filtrate chambers 14, and a rotating shaft 11. And a housing 16 that is rotatably supported. The housing 16 is connected to the slurry tank 40 and the sludge box 80A via the first and second circulation pipes 50 and 70, and is connected to the filtration system 100 of the second embodiment. It is configured accordingly. The filtrate chamber 14 is formed by the pair of disc-shaped filter plates 13 as described above. The housing 16 has a bottom surface formed as a flat surface and an upper portion formed as an arc surface. A gap is formed between the inner circumference of the upper arc surface of the housing 16 and the outer circumference of the filtration chamber 14, and the slurry S1 returns from the through hole 29 on the arc surface of the housing 16 to the first circulation pipe 50 via the gap. It flows out to the pipe 50B. A space in the housing 16 is formed as a filtration chamber 12.

  As shown in FIG. 5, the filter 10A is connected to the slurry tank 40 via the first circulation pipe 50, and the slurry S1 in the slurry tank 40 is connected to the filter 10A via the first circulation pipe 50. The slurry S1 is repeatedly filtered. Further, a sludge box 80A is connected to the bottom surface of the housing 16 of the filter 10A, and the sludge S2 accumulated in the housing 16 is discharged to the sludge box 80A. The sludge box 80A is connected to the filter 10A via the second circulation pipe 70, and the sludge S2 in the sludge box 80A is circulated between the filter 10A and the solid component of the sludge S2 is gradually concentrated. it can. In FIG. 5, 51 is a first pump for circulating the slurry S1, and 71 is a second pump for circulating the sludge S2.

  As shown in FIGS. 6A and 6B, the filtrate chamber 14 includes a pair of filter plates 13 arranged with a predetermined gap therebetween, and a pair of filter plates 13 having a predetermined inner peripheral portion and outer peripheral portion. The first and second annular members 13C and 13D that hold the gap are formed, and a space surrounded by the pair of filter plates 13 and the first and second annular members 13C and 13D is formed as the filtrate chamber 14. ing. Similar to the first embodiment, the filter plate 13 includes a filter medium 13A and a support plate 13B in which a large number of holes are formed. However, in this embodiment, since the space in the housing 16 is formed as the filtration chamber 12, as shown in FIG. 6B, the filter medium 13A is disposed on the outer surface of the filtrate chamber 14, that is, the outer surface of the support plate 13B. Is covered. Hereinafter, the outer surface of the filter plate 13 to which the filter medium 13A is applied is referred to as a filtration surface.

  In the first annular member 13C, a flow path 13E that penetrates in the radial direction from the inner circumferential surface to the outer circumferential surface is formed at a predetermined interval in the circumferential direction. These flow paths 13E are formed so as to communicate with the second flow path 11B of the rotating shaft 11. The first annular member 13C is fixed to the outer peripheral surface of the flow path forming member 21, and the second flow path 11B of the rotating shaft 11 and the flow path 13E of the first annular member 13C are connected to the flow path forming member 21. A flow path 21A is formed.

  Accordingly, the slurry S1 forms a cake layer on the filtration surface outside the filtrate chamber 14, and the filtrate L passing through the filtration surface flows into the filtrate chamber 14 between the pair of filter plates 13. The cake layer is scraped off from the filtration surface by a scraper 17 described later.

As shown in FIG. 5, the two scrapers 17, one separator 17D, and the slurry supply pipe 30 are all erected in the sludge box 80A at predetermined intervals, and the filtrate is placed in the gap between the adjacent filtrate chambers 14. It is inserted in a column along the chamber 14. In the present embodiment, the scraper 17 scrapes the cake layer from the respective filtration surfaces of the filter plates 13 on both sides facing each other while the filtrate chamber 14 rotates. Both the scraper 17 and the separator 17D have substantially the same functions as those used in the first embodiment. The scraper knife 17A and the separator 17D have the same cross-sectional shape as FIG. Thus, since the sludge side and the slurry side are partitioned by the two scrapers 17 and one separator 17D inserted between the adjacent filter plates 13, sludge S2 having a high solid component concentration can be obtained on the sludge side. it can.

  As described above, in the filter 10 </ b> A, a plurality of filtrate chambers 14 are arranged in parallel with the rotary shaft 11, and two scrapers 17, one separator 17 </ b> D, and a slurry supply pipe 30 are filtrated between the adjacent filtrate chambers 14. The filtration chamber 10 is different from the filter 10 of the first embodiment in that the filtration chamber 12 is formed by being arranged in a column along the chamber 14 and surrounding the filtrate chamber 14 by a housing 16. In other respects, the filter 10 is configured according to the first embodiment.

  Next, the operation will be described. When the filter 10A is started, the filtrate chamber 14 is rotated at a predetermined speed via the rotating shaft 11, and the first pump 51 is started to transfer the slurry S1 in the slurry tank 40 to the first circulation pipe 50 and the slurry. It supplies to the filtration chamber 12 through the supply pipe 30. In the filtration chamber 12, the slurry S <b> 1 is filtered through the filtration surfaces of the plurality of filtrate chambers 14, solid components accumulate on the filtration surfaces to form a cake layer, and the filtrate L flows out to the filtrate chamber 14. The cake layer on the filtration surface reaches the scraper 17 by the rotation of the filtrate chamber 14, where the cake layer is scraped off by the previous scraper 17 and then the remaining cake layer is scraped off by the subsequent scraper 17. The filtration surface from which the cake layer has been scraped passes through the separator 17D, and the filtration of the slurry S1 is repeated in the filtration chamber 12. The filtrate L in the filtrate chamber 14 is recovered by an external filtrate recovery device via the first and second flow paths 11A and 11B of the rotating shaft 11.

  During this time, the slurry S 1 in the filtration chamber 12 circulates between the slurry tank 40 via the first circulation pipe 51. As the slurry S1 in the slurry tank 40 circulates, the amount of liquid decreases by the amount of the filtrate, and the concentration of the solid component of the slurry S1 gradually increases. On the other hand, the sludge S2 is scraped off by the scraper 17 and introduced into the sludge box 80A from the filtration chamber 12 and accumulated. The sludge S2 in the sludge box 80A is returned to the filtration chamber 12 through the second circulation pipe 70 by the action of the second pump 71, and circulates between the sludge box 80A and the filtration chamber 12. During this time, the liquid content decreases by the amount of the filtrate L, and the concentration of the solid component of the sludge S2 gradually increases.

  As described above, according to the present embodiment, since the slurry S1 is filtered in the plurality of filtrate chambers 14, the amount of filtration treatment of the slurry S1 can be remarkably increased compared to the above embodiments. In addition, the same effects as those of the second embodiment can be expected.

  In addition, this invention is not restrict | limited to each said embodiment at all, As long as it is not contrary to the summary of this invention, it can design-change each component suitably as needed.

  The present invention can be suitably used for a filter that filters solid components such as fine particles.

DESCRIPTION OF SYMBOLS 10 Rotating filter type filter 11 Rotating shaft 11A, 21A 1st flow path (1st discharge means)
11B, 21B Second flow path (first discharge means)
12 Filtration chamber 13 Filter plate 14 Filtrate chamber 16 Housing plate (housing)
17 Scraper 17C Scraper fixing member (fixing member)
18 Slurry supply means (supply means)
19 Filtrate discharging means (first discharging means)
20 Sludge discharge means 21 Flow path forming member 31A Sludge flow path (second discharge means)
31B sludge flow path (second discharge means)

Claims (4)

A pair of circular filter plates fixed to the rotary shaft at a predetermined interval in the axial direction, a circular filtration chamber and a filtrate chamber formed by being partitioned by the pair of filter plates, the filtration chamber, A housing fixed to a base so as to surround the filtrate chamber, and the rotating shaft so as to scrape off a cake layer deposited on the filtration surface of the pair of filter plates in the filtration chamber while the rotating shaft rotates. A scraper extending from the outer periphery of the filtration chamber, a fixing member integrated with the scraper so as to fix the scraper to the housing, and supplying the liquid to be treated to the filtration chamber Supply means, first discharge means for discharging the filtrate from the filtrate chamber, and second discharge means for discharging the solid component scraped by the scraper, the first discharge means comprising: Communicating with the filtrate chamber A rotary filter type filtration having a flow path provided in the rotating shaft so as to discharge the filtrate, and wherein the second discharge means has a discharge path passing through the housing and communicating with the scraper. Machine.   The rotary filter type filter according to claim 1, wherein a plurality of the pair of filter plates are arranged at predetermined intervals on the rotary shaft.   The rotary filter plate type filter according to claim 1 or 2, further comprising first circulation means for circulating the liquid to be treated to the filtration chamber. The rotary filter type filtration according to any one of claims 1 to 3, further comprising second circulation means for circulating the solid component scraped by the scraper to the filtration chamber. Machine.

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