JP6239433B2 - Sludge concentration machine and sludge concentration system - Google Patents

Description

  The present invention relates to a sludge concentrator and a sludge concentrating system, and more particularly to a sludge concentrator and a sludge concentrating system for filtering sludge to increase the concentration of solid components.

  Conventionally, a sludge concentrator that filters sludge to increase the concentration of solid components is known (see, for example, Patent Document 1).

  Patent Document 1 discloses a sludge flocking device (sludge concentrating device) including a mixing tank into which sludge and a flocculant are fed, a cylindrical body disposed in the mixing tank, a screw, and a motor that rotationally drives the screw. Machine) is disclosed. The cylindrical body includes a plurality of fixed rings arranged at intervals, and a movable ring arranged between adjacent fixed rings. The screw is arranged inside the cylindrical body and is configured to move the movable ring by rotating. In the sludge flocking device disclosed in Patent Document 1, the movable ring is pushed and moved by the external force from the screw between the adjacent fixed rings, thereby suppressing the clogging in the gap between the fixed ring and the movable ring. Is configured to do.

  However, in the sludge flocking device (sludge concentrator) of Patent Document 1, although it is possible to suppress clogging of the flock in the gap between the fixed ring and the movable ring, the fixed ring (fixed plate) The floc adhering to the outer periphery cannot be removed. For this reason, there is a disadvantage that the sludge flocking device is clogged and the ability to concentrate sludge is reduced.

  In order to eliminate the above inconvenience, conventionally, there has also been proposed an apparatus that suppresses clogging of the flock in the gap between the fixed ring and the movable ring and removes the flock adhering to the outer peripheral portion of the fixed ring. (For example, refer to Patent Document 2).

  In the sludge flocking device of Patent Document 2, as in Patent Document 1, the movable ring is pressed between the adjacent fixed rings by being pressurized by the pressure member, so that the fixed ring and the movable ring are It is configured to suppress the clogging of the flock in the gap between the two. Furthermore, in this patent document 2, it is comprised so that the flock adhering to the outer peripheral part of a fixing ring may be scraped off by rotating a pressurizing member contact | abutting to a fixing ring along the outer peripheral part of a cylindrical body, and pressurizing. Has been. By these, in patent document 2, the fall of the concentration capability of the sludge resulting from clogging is suppressed.

JP 2007-054684 A JP 2009-213986 A

  However, in the sludge flocking device (sludge concentrator) of Patent Document 2, it is possible to suppress a decrease in the sludge concentration capability due to clogging, while pressurizing along the outer peripheral portion of the cylindrical body. Since the member pressurizes the movable ring and the cleaning member having brush fibers implanted on the surface contacts the fixed ring and rotates, friction occurs between the pressure member, the cleaning member, and the movable ring. As a result, the pressure member, the cleaning member, and the outer peripheral portion of the movable ring (movable plate) are worn, so that there is a problem that these members need to be replaced.

  In addition, since both configurations of Patent Documents 1 and 2 are provided with a drain pipe at the bottom of the mixing tank, a stand for lifting the mixing tank is provided to install the drain pipe, or the mixing tank is placed on the floor. When installed on the top, it is necessary to bury the drainage pipe in the ground, and there is a problem that the installation cost increases.

  Further, in Patent Document 1, an on-off valve is provided to adjust the amount of filtrate to be discharged. In Patent Document 2, a filtrate overflow pipe through which filtrate flows is provided, By changing the height of the outlet opening, the water head difference (the difference between the height of the liquid level connected to the filtrate discharge flow path and the level of the liquid level of the tank equipped with the sludge concentrator) is changed. It is the structure which adjusts the quantity of the inflow filtrate. For this reason, a structure for adjusting the amount of the filtrate is necessary, and the troublesome work of changing the height of the on-off valve and the filtrate overflow pipe in order to adjust the amount of the filtrate is involved. There is.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to reduce the installation cost while preventing wear of the outer peripheral portion of the movable plate, To provide a sludge concentrator and a sludge concentrating system capable of easily adjusting the amount of filtrate and suppressing a decrease in sludge concentration capacity caused by clogging without requiring a cleaning member or the like. It is.

A sludge concentrator according to a first aspect of the present invention is adjacent to a rotating shaft having a screw for sending filtered water, a motor for rotating the rotating shaft, and a plurality of fixed plates arranged to surround the screw. A laminated filter body including a movable plate disposed between fixed plates and having a filtration groove formed between adjacent fixed plates, and water or air is caused to flow backward from the piping for discharging the filtrate into the laminated filter body. By this, it has the washing | cleaning means which wash | cleans with water or air from the inner side of a laminated filter body with respect to the outer peripheral part of a laminated filter body .

  In the sludge concentrator according to the first aspect of the present invention, as described above, the outer peripheral portion of the multilayer filter body is attached to the outer peripheral portion of the multilayer filter body by providing a cleaning means for cleaning with water or air. Since the solid component which removes can be removed, it can suppress that the capability to concentrate sludge resulting from clogging falls. In addition, since the outer periphery of the laminated filter medium is washed with water or air, the outer periphery of the fixed plate and the movable plate is attached to the outer periphery of the fixed plate and the movable plate by rotating the pressure member and the cleaning member in contact with the outer periphery of the fixed plate and the movable plate. Unlike the case where the solid component is removed, it is possible to prevent the outer periphery of the pressure member, the cleaning member, and the movable plate from being worn. Accordingly, it is possible to suppress a decrease in sludge concentration capability due to clogging without requiring a cleaning member or the like while preventing wear of the outer peripheral portion of the movable plate. Moreover, since the filtrate can be discharged from the upper side of the sludge concentrator by providing a screw that sends filtered water, it is possible to arrange the sludge concentrator even in a tank in which no flow path is formed on the lower side. it can. Thereby, the freedom degree of arrangement | positioning of a sludge concentrator can be improved. Also, since water is sent by the screw, it is appropriate without providing a head difference (difference between the liquid level connected to the filtrate discharge flow path and the liquid level of the tank provided with the sludge concentrator). Filtration can be performed. Accordingly, the installation cost can be reduced and a sludge concentrator capable of easily adjusting the amount of filtrate can be provided.

  In the sludge concentrator according to the first aspect, preferably, the cleaning means includes a laminated filter including the inside of the filtration groove by causing water or air to flow backward in the concentration filtration groove which is a gap between the fixed plate and the movable plate. It is comprised so that the outer peripheral part of a body may be wash | cleaned. If configured in this way, in the configuration in which water components are filtered from the outer peripheral side to the inner peripheral side of the laminated filter medium, water or air flows from the inner peripheral side to the outer peripheral side during cleaning. The solid component adhering to the vicinity of the outer peripheral portion of the laminated filter body can be easily peeled off by water pressure or air pressure and removed to the outside.

  In this case, preferably, the cleaning means includes a motor and a screw, and by driving the motor to rotate in a direction opposite to that during normal operation, by rotating the screw in a direction opposite to that during normal operation, It is comprised so that the outer peripheral part of the laminated filter body containing the inside of a filtration groove | channel may be wash | cleaned by making the water filtered in the concentration filtration groove | channel reversely flow. If comprised in this way, since it is not necessary to provide the cleaning member etc. for eliminating clogging of the laminated filter body containing the inside of a filtration groove | channel, it can suppress that a number of parts increases. In addition, since the outer periphery of the laminated filter body including the inside of the filtration groove is washed by flowing the filtered water back, it is not necessary to draw dedicated water for washing separately, and the dedicated water for washing is drawn. There is no need to provide piping for the purpose. In this respect as well, an increase in the number of parts can be suppressed. As a result, even if a cleaning means is provided, it is possible to prevent the configuration of the sludge concentrator from becoming complicated.

  In the configuration in which the filtered water is caused to flow back into the concentration filtration groove by driving the motor so as to rotate in the opposite direction to that during normal operation, preferably, the rotating shaft includes an internal pump unit in addition to the screw. The cleaning means further includes an internal pump part in addition to the motor and the screw, and the internal pump part is usually added in addition to the screw by driving the motor to rotate in the direction opposite to that during normal operation. By rotating in the opposite direction to that during operation, the outer peripheral portion of the laminated filter body including the inside of the filtration groove is washed by causing the water filtered in the concentration filtration groove to flow backward. If comprised in this way, in addition to the propulsion force of a screw, the water filtered using the propulsion force of an internal pump part can be backflowed, Therefore The outer periphery of the laminated filter body including the inside of a filtration groove is washed effectively. can do. Moreover, since the filtered water can be sent using the internal pump unit in addition to the screw during normal operation, the filtered water can be pushed up to a higher position.

  In the configuration in which the filtered water flows back into the concentration filtration groove by driving the motor so as to rotate in the direction opposite to that during normal operation, preferably, the cleaning means has a predetermined timing during normal operation. The outer peripheral portion of the laminated filter body including the inside of the filtration groove is washed by causing the filtered water to flow back into the concentration filtration groove by driving it to rotate in the direction opposite to that during normal operation. Yes. If comprised in this way, since the outer peripheral part of the laminated filter body including the inside of the filtration groove is intermittently washed during normal operation, even if the sludge concentrator is operated for a long time, it is caused by clogging. And it can suppress that the capability to concentrate sludge falls.

A sludge concentrating system according to a second aspect of the present invention is provided in a sludge concentrator main body, a rotary shaft having a screw for sending filtered water, a motor provided in the sludge concentrator main body and rotating the rotary shaft, A laminated filter body including a plurality of fixed plates arranged so as to surround the screw in the sludge concentrator main body and a movable plate arranged between adjacent fixed plates, and a filtration groove formed between the adjacent fixed plates. Then, water or air is fed back from the inside of the laminated filter body to the outer peripheral portion of the laminated filter body by washing water or air back from the pipe for discharging the filtrate to the inside of the laminated filter body. Cleaning means.

  In the sludge concentration system according to the second aspect of the present invention, as described above, the cleaning means for cleaning the outer peripheral portion of the laminated filter body by supplying water or air from the inside or outside of the sludge concentrator body. By providing, since the solid component adhering to the outer peripheral part of a laminated filter body can be removed, it can suppress that the capability to concentrate sludge resulting from clogging falls. In addition, since the outer periphery of the laminated filter medium is washed with water or air, the outer periphery of the fixed plate and the movable plate is attached to the outer periphery of the fixed plate and the movable plate by rotating the pressure member and the cleaning member in contact with the outer periphery of the fixed plate and the movable plate. Unlike the case where the solid component is removed, it is possible to prevent the outer periphery of the pressure member, the cleaning member, and the movable plate from being worn. Thus, it is possible to provide a sludge concentrating system capable of suppressing a decrease in the sludge concentrating ability caused by clogging without requiring a cleaning member or the like while preventing wear of the outer peripheral portion of the movable plate. Can do. In addition, by providing a screw that sends filtered water, the filtrate can be discharged from the upper side of the sludge concentrator, so that the sludge concentrator main body is arranged even in a tank in which no flow path is formed on the lower side. Can do. Thereby, the freedom degree of arrangement | positioning of a sludge concentration machine main body can be improved. Moreover, since water is sent by the screw, there is no need to provide a water head difference (difference between the liquid level connected to the filtrate discharge flow path and the liquid level of the tank provided with the sludge concentrator body). Appropriate filtration can be performed. As a result, the installation cost can be reduced and a sludge concentration system capable of easily adjusting the amount of filtrate can be provided.

  In the sludge concentration system according to the second aspect, preferably, the cleaning means includes a motor and a screw, and the screw is driven during normal operation by driving the motor to rotate in a direction opposite to that during normal operation. By rotating in the opposite direction, the water filtered from the inside of the sludge concentrator body is caused to flow backward in the concentration filtration groove, which is the gap between the fixed plate and the movable plate, and the outer periphery of the laminated filter body including the inside of the filtration groove Is configured to wash. If comprised in this way, since it is not necessary to provide the cleaning member etc. for eliminating clogging of the laminated filter body containing the inside of a filtration groove | channel, it can suppress that a number of parts increases. Moreover, since the outer periphery of the laminated filter body including the inside of the filtration groove is cleaned, there is no need to draw dedicated water for cleaning separately, and piping for drawing dedicated water for cleaning is also required. There is no. In this respect as well, an increase in the number of parts can be suppressed. As a result, even if a cleaning means is provided, it is possible to prevent the configuration of the sludge concentration system from becoming complicated.

  In this case, preferably, the rotating shaft is provided with an internal pump portion in addition to the screw, and the cleaning means further includes an internal pump portion in addition to the motor and the screw, and the motor is reverse to that during normal operation. By driving to rotate in the direction, in addition to the screw, the internal pump part was rotated in the opposite direction to that during normal operation, and filtered into the concentration filtration groove, which is the gap between the fixed plate and the movable plate. It is comprised so that the outer peripheral part of the laminated filter body containing the inside of a filtration groove | channel may be wash | cleaned by making water flow backward. If comprised in this way, in addition to the propulsion force of a screw, the water filtered using the propulsion force of an internal pump part can be backflowed, Therefore The outer periphery of the laminated filter body including the inside of a filtration groove is washed effectively. can do. Moreover, since the filtered water can be sent using the internal pump unit in addition to the screw during normal operation, the filtered water can be pushed up to a higher position.

  In the sludge concentrating system according to the second aspect, preferably, the cleaning means is installed outside the sludge concentrator main body, and the filtered water is caused to flow backward in the sludge concentrator main body so as to include the inside of the filtration groove. Includes an external pump for cleaning the perimeter. If comprised in this way, since the water filtered using the external pump installed outside the sludge concentrator main body can be easily reversed, the outer peripheral portions of the fixed plate and the movable plate can be easily washed. it can. Moreover, compared with the case where an internal pump part is provided in a sludge concentration machine main body, while being able to reduce a sludge concentration machine main body, it can suppress that the structure of a sludge concentration machine main body becomes complicated.

  The sludge concentrating system according to the second aspect preferably further includes a vertical position adjusting mechanism for adjusting the vertical position of the sludge concentrator body in the tank in which the sludge concentrator body is accommodated. With this configuration, the sludge concentrator main body can be arranged at a vertical position where the concentration of the solid component is thin in consideration of the concentration difference between the upper and lower sludge due to the specific gravity of the solid component in the sludge. In addition, it is possible to efficiently concentrate sludge while suppressing the adhesion of solid components.

In the sludge concentration system according to the second aspect, preferably, the cleaning means is disposed on the bottom side of the tank in which the sludge concentrator body is accommodated, includes a bubble generation unit that generates air bubbles, With the sludge concentrator main body in place, the outer periphery of the laminated filter including the inside of the filtration groove by convection stirring and floating the sludge in the tank by the buoyant action of the bubbles generated on the bottom side of the tank by the bubble generating section It is comprised so that the part vicinity may be wash | cleaned. If comprised in this way, the solid component adhering to the outer peripheral part of the laminated filter body containing the inside of a filtration groove | channel by the produced | generated bubble can be removed. Moreover, since the solid component in the sludge can be levitated by the bubbles, the sludge can be efficiently filtered and concentrated at the position where the concentration of the solid component in the lower part of the tank is reduced.
A sludge concentrator according to a third aspect of the present invention is adjacent to a rotating shaft having a screw for sending filtered water, a motor for rotating the rotating shaft, and a plurality of fixed plates arranged to surround the screw. A laminated filter body including a movable plate disposed between fixed plates and having a filtration groove formed between adjacent fixed plates, and a cleaning means for cleaning the outer peripheral portion of the laminated filter body with water or air And the cleaning means includes a motor and a screw, and rotates the motor in a reverse direction to that in normal operation, and reversely rotates the screw to reversely flow water into the filtration groove and include the inside of the filtration groove. It is comprised so that the outer peripheral part of a filter body may be wash | cleaned.

  According to the present invention, as described above, the installation cost can be reduced while preventing the outer peripheral portion of the movable plate from being worn, the amount of filtrate can be easily adjusted, and a cleaning member or the like is required. Therefore, it is possible to suppress a decrease in the sludge concentration capability due to clogging.

It is the schematic which showed the water treatment system provided with the sludge concentration system by 1st Embodiment of this invention. It is the figure which showed the sludge concentration system by 1st Embodiment of this invention. It is a principal part enlarged view of the sludge concentrator by 1st Embodiment of this invention. It is sectional drawing along the 150-150 line | wire of FIG. It is the figure which showed the sludge concentration system by 2nd Embodiment of this invention. It is the figure which showed the sludge concentration system by 3rd Embodiment of this invention. It is the figure which showed the sludge concentration machine by the modification of 3rd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
The sludge concentration system 100 according to the first embodiment is provided as a part of the components of the water treatment system 101. The water treatment system 101 is configured to treat the treated water discharged from industry, agriculture, livestock industry or household (for daily life) so as to have a water quality that can be discharged into a river or the like. Further, as shown in FIG. 1, the water treatment system 101 includes a sludge concentrator 1, a sludge storage tank 2, a tank 3, a flow rate adjustment tank 4, a biological reaction tank (aeration tank) 5, and a final sedimentation tank. 6 and a dehydrator 7. Moreover, the sludge concentration system 100 is comprised by the sludge concentrator 1, the sludge storage tank 2, and the tank 3 among the water treatment systems 101. FIG. The sludge concentrator 1 is an example of the “sludge concentrator body” in the present invention.

  First, components of the water treatment system 101 other than the sludge concentration system 100 will be schematically described, and then the configuration of the sludge concentration system 100 will be described in detail.

  In the water treatment system 101, the flow rate adjusting tank 4 is configured to adjust the flow rate of the water to be treated to a predetermined amount while the water to be treated is flown in and stored. In other words, even when the amount of treated water flowing in varies depending on the time zone, once the treated water is stored in the flow rate adjusting tank 4, the flow rate of the treated water to the subsequent stage of the flow rate adjusting tank 4 becomes a predetermined amount. It is adjusted to become.

  The biological reaction tank 5 is configured to biologically treat the water to be treated with activated sludge (microorganisms) by aeration (aeration). The final sedimentation basin 6 is configured to precipitate suspended matters in the water (such as activated sludge). The dehydrator 7 is provided for dewatering the concentrated sludge condensed and concentrated in the sludge storage tank 2 (lowering the water content), separating the solid sludge and the liquid (filtrate), and discharging each. It has been.

  Here, the sludge concentration system 100 by 1st Embodiment comprised by the sludge concentration machine 1, the sludge storage tank 2, and the tank 3 among the water treatment systems 101 is demonstrated in detail.

  The sludge storage tank 2 in which the sludge concentrator 1 is accommodated is configured to store the sludge sent from the final sedimentation tank 6. Further, the sludge storage tank 2 is configured so that flocs are formed by aggregating solid components in the sludge when a flocculant is introduced.

  As shown in FIG. 2, the sludge concentrator 1 is disposed in the sludge storage tank 2 and is configured to concentrate the sludge in the sludge storage tank 2 (increase the concentration of solid components (floc)). Yes. Specifically, the sludge concentrator 1 is configured to filter the water in the sludge and discharge it as a filtrate out of the sludge storage tank 2. Moreover, the filtrate discharged | emitted by the sludge concentrator 1 is comprised so that it may be sent to the tank 3 via the piping 31. FIG. The tank 3 is configured to store a predetermined amount of the filtrate sent from the sludge concentrator 1.

  The sludge concentrator 1 includes a rotating shaft 11, a fixed plate 12, a movable plate 13, an impeller 14, a motor 15, and a connection member 16. In the sludge concentrator 1, a spacer 16a is interposed between the fixed plates 12 and 12 to form filtration grooves S having a predetermined interval. Further, in the sludge concentrator 1, a movable plate 13 is movably fitted in the filtration groove S. Further, the sludge concentrator 1 is laminated in a cylindrical shape by connecting the fixed plate 12 and the spacer 16a by the connecting member 16 in a state where the movable plate 13 is disposed between the fixed plates 12 (filtration grooves S). The laminated filter body F thus formed is formed. Further, in the sludge concentrator 1, the filtrate flows from the filtration groove S of the laminated filter medium F, and the sludge concentrator from the concentration filtration groove NS, which is a slit corresponding to the thickness obtained by subtracting the thickness of the movable plate 13 from the filtration groove S. 1 is taken in. Further, the sludge concentrator 1 is supported and arranged in the sludge storage tank 2 so as to be suspended by a float 17 floating on the water surface of the sludge storage tank 2. The impeller 14 is an example of the “cleaning unit” and “internal pump unit” of the present invention, and the motor 15 is an example of the “cleaning unit” of the present invention. The float 17 is an example of the “vertical position adjusting mechanism” in the present invention.

  The rotating shaft 11 is configured to rotate by driving a motor 15. The rotating shaft 11 is provided with a screw 11a that pushes up (sends) water filtered from below to above in the rotation direction during normal operation. Further, an impeller 14 having a pump function is attached to the rotating shaft 11. That is, both the screw 11 a and the impeller 14 are rotationally driven by the rotational drive of the rotary shaft 11 by the motor 15. Further, when the rotating shaft 11 is rotated in one direction by the motor 15 during normal operation (at the time of filtration operation), the filtrate filtered by the screw 11a and the impeller 14 is sent to the tank 3 (the filtrate is supplied in the A direction). Send). Further, when the rotating shaft 11 is rotated in the other direction by the motor 15 during cleaning, the screw 11a and the impeller 14 cause the filtrate in the tank 3 to flow back to the sludge concentrator 1 as cleaning water (filtrate in the B direction). (Washing water is sent). The screw 11a is an example of the “cleaning means” in the present invention.

  When the screw 11a rotates, the movable plate 13 is configured to be eccentrically moved in the radial direction (horizontal direction) in the concentration filtration groove S by receiving an external force from the screw 11a. Further, when the number of rotations of the screw 11a and the impeller 14 is increased, the amount of filtrate to be sent to the tank 3 is increased, so that negative pressure is generated inside the sludge concentrator 1 (pressure is reduced), and a large amount of water is discharged. It can be taken in as a filtrate. Therefore, at the time of filtration, it is possible to adjust the filtration flow rate (the flow rate of the filtrate) by adjusting the rotation speed of the screw 11a and the impeller 14. Note that the screw 11a and the impeller 14 are operated at a rotational speed at which a pressure loss due to filtration and a propulsive force equal to or higher than the water pressure necessary to lift the filtrate are obtained.

  The fixed plate 12 and the movable plate 13 are disposed so as to surround the screw 11a. A plurality of fixed plates 12 and movable plates 13 are provided along the axial direction of the rotating shaft 11. Moreover, the fixed plate 12 and the movable plate 13 are formed in a hollow substantially circular shape (annular shape) as shown in FIG. The plurality of fixed plates 12 are arranged at predetermined intervals (the width of the filtration groove S) in the axial direction (vertical direction) of the rotary shaft 11 by the spacer 16a and the connection member 16, and are disposed in the filtration groove S. The movable plate 13 is fixed while being loosely fitted. Specifically, as shown in FIGS. 3 and 4, the plurality of fixing plates 12 are arranged so as to be adjacent to each other in the vertical direction via the spacer 16a, and the connecting member 16 is inserted into the insertion hole 16b of the spacer 16a. And are fixed by passing through the connection hole 12a. As shown in FIG. 4, the fixing plate 12 is fixed by connecting members 16 at three positions with an interval of, for example, 120 degrees in the circumferential direction of the fixing plate 12.

  Further, the plurality of fixed plates 12 are arranged at intervals in the vertical direction that are narrower than the size of the floc aggregated in the sludge storage tank 2. As a result, the water in the sludge is filtered inward from the concentration filtration groove NS on the outer side of the laminated filter body F without passing through the flocs by the narrow concentration filtration groove NS formed in the filtration groove S. It is configured.

  As shown in FIG. 3, the movable plate 13 is disposed between the fixed plates 12 adjacent in the vertical direction (filtration groove S). That is, a plurality of movable plates 13 are provided along the axial direction of the rotating shaft 11. Moreover, the movable plate 13 is formed in a hollow substantially circular shape (annular shape) as shown in FIG. The movable plate 13 is movably disposed in a state where it is passed through the rotary shaft 11 (screw 11a). That is, the movable plate 13 is configured to be movable within the range between the adjacent fixed plates 12 (the filtration groove S) in the vertical direction. The movable plate 13 is configured to move in response to the rotation of the screw 11a in the horizontal direction orthogonal to the vertical direction. Thereby, the movable plate 13 is configured to receive an external force from the screw 11a in the filtration groove S and move eccentrically in the radial direction, and remove flocs (solid components) between the adjacent fixed plates 12 by scraping. Yes. As a result, clogging of the filtration groove S can be suppressed. As shown in FIG. 3, the movable plate 13 is preferably configured such that the outer diameter of the movable plate 13 protrudes out of the laminated filter body F by being pushed by the screw 11 a. Thereby, it is possible to more effectively remove the flocs on the outer peripheral portion of the laminated filter medium F.

  Here, as shown in FIG. 4, the movable plate 13 is formed in an annular shape having an inner diameter D1 and an outer diameter D2. Further, the screw 11a is formed to have a rotation diameter (a diameter at the maximum position of rotation) D3. The fixed plate 12 is formed in an annular shape having an inner diameter D4 and an outer diameter D5.

  The inner diameter D1 of the movable plate 13 is formed to be smaller than the rotational diameter D3 of the screw 11a. Thereby, the screw 11a can contact | abut to the inner periphery of the movable plate 13, and the movable plate 13 can be moved to a horizontal direction. Further, the rotational diameter D3 of the screw 11a is formed to be slightly smaller (for example, 2 mm) than the inner diameter D4 of the fixed plate 12. Thereby, since there is only a minimum gap between the screw 11a and the fixed plate 12, the propulsive force of the screw 11a can be efficiently transmitted to the filtrate.

  Further, the outer diameter D2 of the movable plate 13 is larger than the inner diameter D4 of the fixed plate 12. This prevents the movable plate 13 from passing through the hole inside the fixed plate 12. Further, the outer diameter D5 of the fixed plate 12 is larger than the outer diameter D2 of the movable plate 13.

  Here, in 1st Embodiment, since the specific gravity of the floc (solid component) aggregated with the coagulant | flocculant is larger than water in the sludge storage tank 2, the density | concentration of a floc (solid component) becomes thick on the lower side. An example is shown. Therefore, in the first embodiment, the sludge concentrator 1 is arranged on the upper side of the sludge storage tank 2. Thereby, it becomes possible to efficiently filter moisture at a position where the concentration of floc (solid component) is low. Specifically, the sludge concentrator 1 is supported so as to be suspended by the float 17. Thereby, even when the water surface descends, the float 17 also descends as the water surface descends, so that the filtration portion (the fixed plate 12 and the movable plate 13) of the sludge concentrator 1 is prevented from coming out above the water surface. Is possible.

  Moreover, in 1st Embodiment, the screw 11a, the impeller 14, and the motor 15 are comprised so that the outer peripheral part of the fixed plate 12 and the movable plate 13 may be wash | cleaned with water as a washing | cleaning means. Specifically, the screw 11a, the impeller 14, and the motor 15 as cleaning means cause the water (filtrate) in the tank 3 to flow backward in the concentration filtration groove NS (the gap between the fixed plate 12 and the movable plate 13). Thus, the outer peripheral portion of the laminated filter body F including the inside of the filtration groove S is washed so as to eliminate clogging of the flock. That is, when the motor 15 is rotationally driven in a direction opposite to that during normal operation, the screw 11a and the impeller 14 are rotated in the other direction opposite to one direction during normal operation, whereby the concentration filtration groove NS. Inside, the filtered water is configured to flow backward.

  Further, the screw 11a, the impeller 14 and the motor 15 as cleaning means are rotated at a predetermined timing during normal operation by rotating the motor 15 in the opposite direction to that during normal operation. By rotating in the direction, the outer peripheral portion of the laminated filter body F including the inside of the filtration groove S is cleaned. For example, based on the flow rate of the filtrate in the piping 31, when the flow rate becomes less than a certain value, the motor 15 is rotated in the opposite direction to that during normal operation, the filtrate in the tank 3 is caused to flow backward, and filtration is performed. The outer periphery of the laminated filter body F including the inside of the groove S is configured to be washed from the inside of the sludge concentrator 1 to the outside. That is, when it is determined that the filtration flow rate is reduced due to the accumulation of flocks (solid components) on the outer peripheral portion of the fixed plate 12, the outer peripheral portion of the laminated filter body F including the inside of the filtration groove S is washed. It is configured. In this case, the flow rate of the filtrate is measured by providing a flow meter in the pipe 31, for example. For example, the flow rate of the filtrate is measured by providing a water level meter in the tank 3.

  Next, with reference to FIG. 1, the flow of the water treatment of the water treatment system 101 including the sludge concentration system 100 according to the first embodiment described above will be described.

  First, the water to be treated which has been flowed into the flow rate adjustment tank 4 and whose flow rate has been adjusted is sent to the biological reaction tank (aeration tank) 5. And in the biological reaction tank 5, the organic substance etc. in to-be-processed water are decomposed | disassembled by the activity of microorganisms. At this time, in the biological reaction tank 5, sludge is increased by the activity of microorganisms.

  The treated water after the biological treatment in the biological reaction tank 5 is sent to the final sedimentation basin 6 together with the activated sludge. In the final sedimentation basin 6, suspended matters in the water (activated sludge, etc.) are precipitated, and the supernatant treated water is discharged into a river or the like. A part of the supernatant treated water is returned to the flow rate adjustment tank 4. On the other hand, the sludge precipitated in the final sedimentation basin 6 is sent to the sludge storage tank 2. A part of the sludge is returned to the biological reaction tank 5. Thereby, the amount of activated sludge in the biological reaction tank 5 is kept at a predetermined amount.

  In the sludge storage tank 2, the sludge concentrator 1 filters the water in the sludge so that the concentration of the solid component (floc) is increased. Thereby, the density | concentration of the concentrated sludge which flows into the dehydrator 7 can be adjusted, and dehydrator 7 can perform dehydration appropriately.

  The filtrate (water) filtered by the sludge concentrator 1 in the sludge storage tank 2 is sent to the tank 3. The tank 3 is configured to temporarily store the filtrate for cleaning the sludge concentrator 1. A part of the filtrate in the tank 3 is discharged into a river or the like, and a part thereof is returned to the flow rate adjustment tank 4.

  The concentrated sludge condensed and concentrated in the sludge storage tank 2 is sent to the dehydrator 7. Then, the concentrated sludge is dehydrated by the dehydrator 7 (water content is lowered) and separated into a dehydrated cake (solid content) and a filtrate (liquid content). The dehydrated cake dehydrated by the dehydrator 7 is discharged and subjected to a process such as incineration. The filtrate discharged from the dehydrator 7 is returned to the flow rate adjustment tank 4.

  In the first embodiment, the following effects can be obtained.

  In 1st Embodiment, as mentioned above, the washing | cleaning means (Screw 11a, impeller 14, and motor) which wash | cleans by flowing back the filtered water with respect to the outer peripheral part of the laminated filter body F including the inside of the filtration groove | channel S By providing 15), the solid component (floc) adhering to the outer peripheral portion of the laminated filter body F including the inside of the filtration groove S can be removed, so that the ability to concentrate sludge due to clogging is reduced. Can be suppressed. Further, by washing the outer peripheral portion of the laminated filter body F including the inside of the filtration groove S from the inside of the sludge concentrator 1 by backflowing the filtered water, a pressure member or a cleaning member is provided on the outer peripheral portion of the laminated filter body F. Unlike the case where the solid component adhering to the outer peripheral portion of the laminated filter body F is removed by rotating while contacting and pressurizing, wear of the outer peripheral portion of the movable plate 13 can be prevented. Accordingly, it is possible to suppress a decrease in the sludge concentration capability due to clogging without requiring a cleaning member or the like while preventing wear of the outer peripheral portion of the movable plate 13. Moreover, since the filtrate can be discharged from the upper side of the sludge concentrator 1 by providing a screw 11a that pushes up the filtered water from the lower side to the upper side, the sludge is concentrated even in a tank in which no flow path is formed on the lower side. The machine 1 can be arranged. Thereby, the freedom degree of arrangement | positioning of the sludge concentration machine 1 can be improved. Further, since water is pushed up from below by the screw 11a, the water head difference (difference between the liquid level connected to the filtrate discharge flow path and the liquid level of the tank in which the sludge concentrator 1 is provided). Even if it does not provide, it can filter appropriately. Thus, the installation cost can be reduced and the amount of filtrate can be easily adjusted.

  In the first embodiment, as described above, the screw 11a as the cleaning means is rotated in the direction opposite to that during normal operation by rotating the motor 15 as the cleaning means in the direction opposite to that during normal operation. As a result, the outer peripheral portion of the laminated filter body F including the inside of the filtration groove S from the inside of the sludge concentrator 1 is made to flow backward in the concentration filtration groove NS (the gap between the fixed plate 12 and the movable plate 13). Configure to wash. Thereby, in the structure which filters a water component from the outer peripheral side to the inner peripheral side of the laminated filter body F, water flows (backflows) from the inner peripheral side to the outer peripheral side during cleaning. The solid component adhering to the vicinity of the outer peripheral portion can be easily peeled off by water pressure and removed to the outside. Further, by performing cleaning using the existing motor 15 and the screw 11a, it is not necessary to separately provide a dedicated motor and screw for backflowing the filtered water, so that the increase in the number of parts can be suppressed. it can. Moreover, since the outer peripheral part of the laminated filter body F including the inside of the filtration groove S is washed back by flowing the filtered water, there is no need to draw dedicated water for washing separately, and the dedicated water for washing There is no need to install pipes for drawing. In this respect as well, an increase in the number of parts can be suppressed. As a result, even if the cleaning means is provided, it is possible to prevent the configuration of the sludge concentrator 1 from becoming complicated.

  Further, in the first embodiment, as described above, by driving the motor 15 to rotate in the direction opposite to that during normal operation, the impeller 14 in addition to the screw 11a also moves in the direction opposite to that during normal operation. By rotating, the filtered water is caused to flow backward in the concentration filtration groove NS so that the outer peripheral portion of the laminated filter body F including the inside of the filtration groove S is washed. Thereby, since the water filtered using the propulsive force of the impeller 14 in addition to the propulsive force of the screw 11a can be made to flow backward, the outer peripheral part of the laminated filter body F including the inside of the filtration groove | channel S is wash | cleaned effectively. be able to. Moreover, since the filtered water can be pushed up using the impeller 14 in addition to the screw 11a during normal operation, the filtered water can be pushed up to a higher position.

  In the first embodiment, as described above, at a predetermined timing during normal operation, the motor 15 is rotated in the opposite direction to that during normal operation, and the screw 11a and the impeller 14 are rotated in the opposite direction. The outer peripheral part of the laminated filter body F including the inside of the filtration groove S is washed by causing the filtered water to flow backward in the concentration filtration groove NS. Thereby, since the laminated filter body F including the inside of the filtration groove S is intermittently washed during the normal operation, even if the sludge concentrator 1 is operated for a long period of time, the sludge is clogged due to clogging. It can suppress that the capability to concentrate falls.

  Moreover, in 1st Embodiment, the float 17 for making the sludge concentration machine 1 float on the water surface of the sludge storage tank 2 is provided as mentioned above. Thereby, when the density of the solid component in the sludge is higher than that of water, and the concentration of the sludge is increased below the sludge storage tank 2, the concentration of the solid component is lower than the sludge storage tank 2. Since the sludge concentrator 1 can be disposed at the position, it is possible to efficiently concentrate sludge while suppressing the adhesion of solid components. Moreover, even if the water surface in the sludge storage tank 2 changes with the float 17, the sludge concentration machine 1 can be located in a predetermined position with respect to the water surface.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, unlike the first embodiment in which the impeller 14 is provided inside the sludge concentrator 1, an example in which the external pump 32 is installed outside the sludge concentrator 201 will be described.

  As shown in FIG. 5, the sludge concentration system 200 according to the second embodiment of the present invention includes a sludge concentrator 201, a sludge storage tank 2, and a tank 3. The sludge concentrator 201 includes a rotating shaft 11 having a screw 11a, a fixed plate 12, a movable plate 13, a motor 15, and a connecting member 16. In the sludge storage tank 2, a bubble generating part 21, a guide 22, and a seat part 23 are provided. An external pump 32 is installed in the tank 3 disposed outside the sludge concentrator 201 and the sludge storage tank 2. The sludge concentrator 201 is an example of the “sludge concentrator body” of the present invention, and the screw 11a, the motor 15, and the external pump 32 are examples of the “cleaning means” of the present invention. The bubble generating unit 21 is also an example of the “cleaning unit” in the present invention.

  Here, in the second embodiment, the sludge concentrator 201 is supported by the guide 22 via the guide bracket 202. Specifically, the sludge concentrator 201 has a guide bracket 202 attached thereto. Further, the guide bracket 202 is fixed to the guide 22 arranged so as to extend vertically in the sludge storage tank 2. Thereby, it is possible to arrange and fix the sludge concentrator 201 at an arbitrary vertical position in the sludge storage tank 2. The guide 22 and the guide bracket 202 are an example of the “vertical position adjusting mechanism” in the present invention.

Here, in 2nd Embodiment, since the specific gravity of the floc (solid component) aggregated with the flocculant is smaller than water in the sludge storage tank 2, the density | concentration of a floc (solid component) is thick on the upper side. An example of the case is shown. Therefore, in the second embodiment, the sludge concentrator 201 is disposed below the sludge storage tank 2 (close to the seat portion 23). Thereby, it becomes possible to efficiently filter moisture at a position where the concentration of floc (solid component) is low. Specifically, the mounting position of the guide bracket 202 with respect to the guide 22 is adjusted downward, and the sludge concentrator 201 is disposed and fixed below the sludge storage tank 2. Further, the sludge concentrator 201 is disposed so as to abut on a seat portion 23 provided at the bottom of the sludge storage tank 2.

  Further, the filtrate discharged by the sludge concentrator 201 is configured to be sent to the tank 3 through the pipe 31. Specifically, the pipe 31 a is connected to the pipe 31 by the valve 33 during the filtration operation (during normal operation). Then, the filtrate is discharged to the tank 3 through the pipe 31a. The pipe 31a is provided on the upper side of the tank 3 and is released to the atmosphere. Thereby, the backflow of the filtrate stored in the tank 3 is prevented during the filtration operation (during normal operation). In addition, when the sludge concentrator 201 is washed by causing the filtrate (washing water) in the tank 3 to flow backward during washing, the pipe 31 b is connected to the pipe 31 by the valve 33. Then, by driving the external pump 32, the filtrate is sent from the tank 3 to the sludge concentrator 201 through the pipe 31 b.

  In the second embodiment, the external pump 32 as a cleaning unit is configured to perform cleaning with water on the outer peripheral portions of the fixed plate 12 and the movable plate 13. Specifically, the external pump 32 serving as a cleaning unit causes the water (filtrate) of the tank 3 to flow back into the concentration filtration groove NS (the gap between the fixed plate 12 and the movable plate 13), thereby filtering the filtration groove S. The outer peripheral portion of the laminated filter body F including the inside is washed to eliminate clogging of the flock. At this time, the motor 15 is driven to rotate in the direction opposite to that in the normal operation together with the driving of the external pump 32, so that the filtered water is caused to flow back into the concentration filtration groove NS by the screw 11a. . Thereby, in addition to the external pump 32, the screw 11a and the motor 15 also function as cleaning means.

  Moreover, in 2nd Embodiment, the bubble generation part 21 is provided in the bottom part of the sludge storage tank 2. FIG. The bubble generating unit 21 is connected to an air source (not shown) and configured to inject bubbles into the sludge storage tank 2. That is, in the state where the sludge concentrator 201 is disposed in the lower part of the sludge storage tank 2, the bubble generation unit 21 is configured to generate bubbles on the bottom side of the sludge storage tank 2. The sludge in the sludge storage tank 2 is convection-stirred and suspended by the floating action of the generated bubbles, so that the vicinity of the outer periphery of the laminated filter body F including the filtration groove S is cleaned. Moreover, it is comprised so that the condensed solid component (floc) may surface by air bubbles.

  In addition, the other structure of 2nd Embodiment is the same as that of the said 1st Embodiment.

  In the second embodiment, the following effects can be obtained.

  In 2nd Embodiment, as mentioned above, the filtered water is made to flow backward with respect to the outer peripheral part of the laminated filter body F containing the inside of the filtration groove S, and the outer peripheral part of the laminated filter body F containing the inside of the filtration groove S is used. An external pump 32 is provided for cleaning. Thereby, since the water filtered using the external pump 32 installed outside the sludge concentrator 201 can be easily reversed, the outer peripheral portion of the laminated filter body F including the inside of the filtration groove S is easily washed. be able to. In addition, the sludge concentrator 201 can be reduced in weight as compared with the case where the internal pump unit (the impeller 14) is provided inside the sludge concentrator 201 (first embodiment), and the configuration of the sludge concentrator 201 can be reduced. Complications can be suppressed.

  Moreover, in 2nd Embodiment, in the state which has arrange | positioned the sludge concentration machine 201 in the lower part of the sludge storage tank 2, while generating a bubble on the bottom part side of the sludge storage tank 2 by the bubble generation part 21, the floating of the generated bubble is carried out. By configuring the sludge in the sludge storage tank 2 to be convectively stirred and suspended by the action, the vicinity of the outer peripheral portion of the laminated filter body F including the filtration groove S is cleaned. The solid component adhering to the outer peripheral part of the laminated filter body F containing the filtration groove | channel S by the bubble produced | generated by this can be removed. Moreover, since the solid component (floc) in the sludge can be levitated by the bubbles, the sludge can be efficiently filtered and concentrated at the position where the concentration of the solid component in the lower portion of the sludge storage tank 2 becomes thin. .

  Moreover, in 2nd Embodiment, the guide 22 and the guide bracket 202 for adjusting the vertical position of the sludge concentration machine 201 in the sludge storage tank 2 in which the sludge concentration machine 201 is accommodated are provided as mentioned above. Thus, in consideration of the concentration difference between the upper and lower sludge due to the specific gravity of the solid component (floc) in the sludge, the vertical position where the concentration of the solid component is thin (in the second embodiment, the bottom of the sludge storage tank 2 ( Since the sludge concentrator 201 can be disposed at the lower position), the sludge can be efficiently concentrated while suppressing the adhesion of solid components.

  Also in the second embodiment, the outer periphery of the fixed plate 12 and the movable plate 13 is washed with filtered water using the screw 11a, the motor 15, and the external pump 32. Thereby, since the solid component (floc) adhering to the outer peripheral portions of the fixed plate 12 and the movable plate 13 can be removed, a cleaning member or the like is required while preventing the outer peripheral portion of the movable plate 13 from being worn. In addition, it is possible to suppress a decrease in the sludge concentration capability due to clogging.

  The remaining effects of the second embodiment are similar to those of the aforementioned first embodiment.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. In the third embodiment, unlike the first and second embodiments, an example of a configuration in which the outer peripheral portions of the fixed plate 12 and the movable plate 13 are cleaned by backflowing air will be described.

  As shown in FIG. 6, the sludge concentration system 300 according to the third embodiment of the present invention includes a sludge concentrator 301, a sludge storage tank 2, and a tank 3. The sludge concentrator 301 includes a rotating shaft 11 having a screw 11a, a fixed plate 12, a movable plate 13, a motor 15, and a connecting member 16. In the sludge storage tank 2, a bubble generating part 21, a guide 22, and a seat part 23 are provided. The sludge concentrator 301 is an example of the “sludge concentrator main body” of the present invention, and the bubble generating unit 21 is an example of the “cleaning means” of the present invention.

  Here, in this third embodiment, since the specific gravity of the floc (solid component) aggregated by the flocculant is smaller than that of water in the sludge storage tank 2, the floc (solid component) is the same as in the second embodiment. The example in the case where the density | concentration of this is high in the upper side is shown. Therefore, in the third embodiment, the sludge concentrator 301 is disposed below the sludge storage tank 2 (close to the seat portion 23). Thereby, it becomes possible to efficiently filter moisture at a position where the concentration of floc (solid component) is low. Specifically, the mounting position of the guide bracket 202 with respect to the guide 22 is adjusted downward, and the sludge concentrator 301 is disposed and fixed below the sludge storage tank 2. Further, the sludge concentrator 301 is disposed so as to abut on a seat portion 23 provided at the bottom of the sludge storage tank 2.

  Further, the filtrate discharged by the sludge concentrator 301 is configured to be sent to the tank 3 via the pipe 31. The connection of the pipe 31 is switched by the valve 34a and the valve 34b. Specifically, during the filtration operation (during normal operation), the valve 34a is opened and the valve 34b is closed. As a result, the filtrate is discharged to the tank 3. Further, when cleaning the sludge concentrator 301, the valve 34a is closed and the valve 34b is opened. Then, the air sent from the air source 302 is sent back to the sludge concentrator 301 via the valve 34b.

  Moreover, in 3rd Embodiment, the air source 302 is comprised so that the outer peripheral part of the fixed plate 12 and the movable plate 13 may be wash | cleaned with air as a washing | cleaning means. Specifically, the air source 302 as a cleaning means is a laminated filter body F including the inside of the filtration groove S by causing the air to flow back into the concentration filtration groove NS (the gap between the fixed plate 12 and the movable plate 13). The outer peripheral portion is cleaned so as to eliminate clogging of the flock. The air source 302 is an example of the “cleaning unit” in the present invention. Further, when the air is caused to flow backward from the air source 302, the filtrate remaining in the sludge concentrator 301 and the pipe 31 is also pushed by the air and flows backward. The outer peripheral part of the laminated filter body F including the inside of the filtration groove S is also washed by the filtrate flowing backward.

  In addition, the other structure of 3rd Embodiment is the same as that of the said 2nd Embodiment.

  In the third embodiment, the following effects can be obtained.

  In 3rd Embodiment, the outer peripheral part of the laminated filter body F containing the inside of the filtration groove | channel S is provided in the outer peripheral part of the laminated filter body F containing the inside of the filtration groove | channel S by providing the air source 302 which cleans with air with respect to the outer peripheral part of the laminated filter body F containing the inside. Since the adhering solid component can be removed, it is possible to suppress a decrease in the ability to concentrate sludge due to clogging. Moreover, since the outer peripheral part of the laminated filter body F including the inside of the filtration groove S is cleaned with air, the laminated filter medium is rotated by pressing a pressurizing member or a cleaning member against the outer peripheral part of the laminated filter body F and rotating. Unlike the case where the solid component adhering to the outer peripheral portion of F is removed, wear of the outer peripheral portion of the movable plate 13 can be prevented. Accordingly, it is possible to suppress a decrease in the sludge concentration capability due to clogging without requiring a cleaning member or the like while preventing wear of the outer peripheral portion of the movable plate 13.

  The remaining effects of the third embodiment are similar to those of the aforementioned first and second embodiments.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the first to third embodiments, an example of a configuration applied to a vertical concentrator (vertical concentrator) in which the sludge concentrator of the present invention is arranged in a vertical state is shown. Is not limited to this. In this invention, the sludge concentrator may be arrange | positioned in the state stood diagonally, or the state turned to the side.

  Moreover, in the said 1st Embodiment, an impeller (internal pump part) is provided in the inside of a sludge concentrator, and in the said 2nd Embodiment, an external pump is provided in the exterior of a sludge concentrator, and the filtered filtrate flows backward. Although the example of the structure to show was shown, this invention is not restricted to this. In the present invention, a configuration may be employed in which the filtrate is caused to flow backward by rotating only the screw in a reverse direction by a motor without providing any of the internal pump unit and the external pump. In this case, the motor and screw function as cleaning means.

  Moreover, although the example of the structure which provides an impeller as an internal pump part was shown in the said 1st Embodiment, this invention is not limited to this. In the present invention, an internal pump unit other than the impeller may be provided in the sludge concentrator.

  Moreover, in the said 1st Embodiment, although the example of the structure which provides an impeller (internal pump part) in a rotating shaft common with a screw was shown, this invention is not limited to this. In this invention, you may provide an internal pump part in the rotating shaft provided separately from the rotating shaft of the screw.

  Moreover, in the said 1st Embodiment, the example of the structure which provides a sludge concentrator below the sludge storage tank, and provided the sludge concentrator above the sludge storage tank in the said 2nd and 3rd embodiment was shown. However, the present invention is not limited to this. In the present invention, a sludge concentrator may be provided near the center in the vertical direction of the tank. For example, when the concentration of solid components near the center in the vertical direction of the tank is the lowest when concentrating the sludge in which the solid components in the tank have a specific gravity greater than that of water and small ones, A sludge concentrator may be provided near the center in the vertical direction.

  Moreover, in the said 2nd Embodiment, although the motor, the screw, and the external pump reversely flowed the filtrate, the example of the structure which wash | cleans the outer peripheral part of the laminated filter body F containing the inside of the filtration groove | channel S was shown. The invention is not limited to this. In the present invention, the outer peripheral portion of the laminated filter body F including the inside of the filtration groove S may be cleaned by causing the filtrate to flow backward only by an external pump without rotating the motor and the screw in reverse.

  Moreover, in the said 3rd Embodiment, although the example of the structure which reversely flows air from the inside of a sludge concentrator and wash | cleans the outer peripheral part of the laminated filter body F containing the inside of the filtration groove | channel S was shown, this invention shows this. Not limited to. In the present invention, as in the modification of the third embodiment shown in FIG. 7, the spiral injection pipe 402 is provided outside the sludge concentrator 401, and air is injected from the outside of the laminated filter body F, so that the filtration groove S You may wash | clean the outer peripheral part of the laminated filter body F containing the inside. Specifically, the spiral injection pipe 402 according to this modification is provided in a spiral shape outside the sludge concentrator 401. Moreover, the spiral injection pipe 402 is provided with a plurality of injection ports 402a on the inner side (the sludge concentrator 401 side). The spiral injection tube 402 is connected to an air source (not shown). And the spiral injection pipe 402 is comprised so that the air supplied from an air source may be injected from the injection port 402a, and the outer peripheral part of the sludge concentrator 401 may be wash | cleaned. Further, the spiral injection tube 402 may be configured to be movable in the vertical direction or may be configured to rotate. Thereby, it becomes possible to inject air uniformly to the outer peripheral part of the sludge concentrator 401. The sludge concentrator 401 is an example of the “sludge concentrator main body” of the present invention, and the spiral spray pipe 402 is an example of the “cleaning means” of the present invention.

  Moreover, in the said 1st-3rd embodiment, although the example of the structure which stores the filtrate filtered with the sludge concentrator in the tank was shown, this invention is not limited to this. In the present invention, the filtrate may be directly sent to the next treatment without providing a tank. In this case, water for cleaning the sludge concentrator may be drawn from the outside. That is, you may wash | clean the outer peripheral part of a fixed plate and a movable plate using water other than the filtered filtrate.

  Moreover, in the said 1st-3rd embodiment, although the example of the structure which uses an aeration tank as a biological reaction tank was shown, this invention is not restricted to this. In the present invention, biological treatment may be performed in the biological reaction tank without aeration (aeration).

  Moreover, although the said 1st-3rd embodiment showed the example of the structure which processes to-be-processed water with a biological reaction tank, a final sedimentation tank, a sludge storage tank, and a dehydrator, this invention is not limited to this. In the present invention, the water to be treated may be further treated with other treatments (for example, chemical treatment (chemical treatment, ozone treatment, etc.)).

  Moreover, in the said 1st Embodiment, although the impeller (internal pump part) was provided in the inside of a sludge concentrator, the said 2nd Embodiment showed the example of the structure which provides an external pump in the exterior of a sludge concentrator, The present invention is not limited to this. In the present invention, an internal pump unit may be provided inside the sludge concentrator, and an external pump may be provided outside the sludge concentrator.

  Moreover, although the said 1st-3rd embodiment showed the example of the structure which provides a spacer between adjacent fixed plates and forms a filtration groove between fixed plates, this invention is not limited to this. In the present invention, a filtration groove may be formed between the fixed plates without providing a spacer. For example, a convex portion may be provided on the fixed plate to position the adjacent fixed plates.

  Moreover, in the said 2nd and 3rd embodiment, although the example of the structure where the outer peripheral part vicinity of a laminated filter body containing a filtration groove | channel is wash | cleaned with the bubble generated by the bubble generation part was shown, this invention is not limited to this. Absent. In the present invention, for example, the sludge concentrator is placed in a state where the sludge concentrator is standing upright or sideways, and the bubbles generated by the bubble generating part are allowed to enter the filtration groove and added to the outer peripheral part of the laminated filter medium. In addition, the inside of the filtration groove may be cleaned.

1, 201, 301, 401 Sludge thickener (sludge thickener main body)
11 Rotating shaft 11a Screw (cleaning means)
12 fixed plate 13 movable plate 14 impeller (cleaning means, internal pump part)
15 Motor (cleaning means)
17 Float (vertical position adjustment mechanism)
21 Bubble generation part (cleaning means)
22 guide (vertical position adjustment mechanism)
32 External pump (cleaning means)
100, 200, 300 Sludge concentration system 202 Guide bracket (vertical position adjustment mechanism)
302 Air source (cleaning means)
402 Spiral injection pipe (cleaning means)
F Laminated filter NS Concentration filtration groove S Filtration groove

Claims (12)

A rotating shaft having a screw for sending filtered water;
A motor for rotating the rotating shaft;
A laminated filter body including a plurality of fixed plates disposed so as to surround the screw, and a movable plate disposed between the adjacent fixed plates, wherein a filtration groove is formed between the adjacent fixed plates;
Washing means for washing water or air from the inside of the laminated filter body to the outer peripheral portion of the laminated filter body by causing water or air to flow backward from the piping for discharging the filtrate to the inside of the laminated filter body And a sludge concentrator.   The cleaning means is configured to clean the outer peripheral portion of the laminated filter body including the inside of the filtration groove by causing water or air to flow backward in the concentration filtration groove that is a gap between the fixed plate and the movable plate. The sludge concentrator according to claim 1, which is configured.   The cleaning means includes the motor and the screw, and by driving the motor to rotate in a direction opposite to that during normal operation, by rotating the screw in a direction opposite to that during normal operation, The sludge concentrator according to claim 2, wherein the sludge concentrator is configured to wash the outer peripheral portion of the laminated filter body including the inside of the filtration groove by causing the water filtered in the concentration filtration groove to flow backward. In addition to the screw, the rotary shaft is provided with an internal pump part,
The cleaning means further includes the internal pump unit in addition to the motor and the screw, and the internal pump unit is driven in addition to the screw by driving the motor to rotate in a direction opposite to that during normal operation. Is configured to wash the outer periphery of the laminated filter body including the inside of the filtration groove by causing the water filtered in the concentration filtration groove to flow backward by rotating in a direction opposite to that during normal operation. The sludge concentrator according to claim 3.   The cleaning means drives the motor to rotate in a direction opposite to that during normal operation at a predetermined timing during normal operation, thereby causing the filtered water to flow backward in the concentration filtration groove. The sludge concentration machine of Claim 3 or 4 comprised so that the outer peripheral part of the said laminated filter body containing the inside of a groove | channel may be wash | cleaned. A rotating shaft having a screw which is provided in the sludge concentrator body and sends filtered water;
A motor that is provided in the sludge concentrator body and rotates the rotating shaft;
A laminated filter body including a plurality of fixed plates disposed so as to surround the screw, and a movable plate disposed between the adjacent fixed plates, wherein a filtration groove is formed between the adjacent fixed plates;
Water or air is supplied from the inner side of the laminated filter medium to the outer peripheral portion of the laminated filter body by flowing water or air back from the piping for discharging the filtrate to the inner side of the laminated filter body for cleaning. A sludge concentration system, comprising:   The cleaning means includes the motor and the screw, and by driving the motor to rotate in a direction opposite to that during normal operation, by rotating the screw in a direction opposite to that during normal operation, The water filtered from the inside of the sludge concentrator main body is caused to flow back into the concentration filtration groove, which is a gap between the fixed plate and the movable plate, so that the outer peripheral portion of the laminated filter body including the inside of the filtration groove is washed. The sludge concentration system of Claim 6 comprised by these. In addition to the screw, the rotary shaft is provided with an internal pump part,
The cleaning means further includes the internal pump unit in addition to the motor and the screw, and the internal pump unit is driven in addition to the screw by driving the motor to rotate in a direction opposite to that during normal operation. Of the laminated filter body including the inside of the filtration groove by causing the filtered water to flow back into the concentration filtration groove, which is a gap between the fixed plate and the movable plate, by rotating in a direction opposite to that during normal operation. The sludge concentration system of Claim 7 comprised so that an outer peripheral part may be wash | cleaned.   The cleaning means is installed outside the sludge concentrator main body, and reversely flows the filtered water through the sludge concentrator main body to clean the outer peripheral portion of the laminated filter body including the inside of the filtration groove. The sludge concentration system of Claim 6 or 7 containing this.   The sludge concentration system according to any one of claims 6 to 9, further comprising a vertical position adjusting mechanism for adjusting a vertical position of the sludge concentrator body in a tank in which the sludge concentrator body is accommodated. .   The cleaning means is disposed on the bottom side of the tank in which the sludge concentrator main body is accommodated, includes a bubble generating part that generates air bubbles, and in the state where the sludge concentrator main body is disposed in the lower part of the tank, By washing the sludge in the tank by convection agitation and floating by the floating action of the bubbles generated on the bottom side of the tank by the bubble generating part, the vicinity of the outer peripheral part of the laminated filter body including the inside of the filtration groove is washed. The sludge concentration system of any one of Claims 6-10 comprised by this. A rotating shaft having a screw for sending filtered water;
A motor for rotating the rotating shaft;
A laminated filter body including a plurality of fixed plates disposed so as to surround the screw, and a movable plate disposed between the adjacent fixed plates, wherein a filtration groove is formed between the adjacent fixed plates;
  Cleaning means for cleaning the outer peripheral portion of the laminated filter body with water or air,
The cleaning means includes the motor and the screw, and reversely rotates the motor to reverse the normal operation, and reversely rotates the screw, thereby causing water to flow back into the filtration groove and passing through the filtration groove. A sludge concentrator configured to wash an outer peripheral portion of the laminated filter body.

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