JP2008036622A - Sludge-thickening device and truck provided with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sludge-thickening device having a reaction tank and a sludge tank, and being capable of easily and stably thickening sludge by smoothly force feeding sewage sucked into the reaction tank into the sludge tank. <P>SOLUTION: The device comprises a tank 5 partitioned by a dividing wall into the sludge tank 8 and the reaction tank 7, a pump 22 pressurizing or depressurizing the reaction tank 7, a suction/pressurization switching valve 25 connecting/disconnecting between the pump 22 and the tank 5, and a tank switching valve 45 connecting a sludge suction pipe 51 delivering raw sewage into the sludge tank 8 to the reaction tank 7 or the sludge tank 8 or connecting the sludge tank 8 and the reaction tank 7. A fourth air pipe 34 connecting the tank 5 and the suction/pressurization switching valve 25 is provided with a pressure reducing valve 36 for lowering the pressure in the pressurized sludge tank than that in the pressurized reaction tank of the tank 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a sludge concentrating device that concentrates and collects septic tank sludge, industrial waste sludge, and the like, and a sludge concentrating vehicle equipped with the same.

  Conventionally, septic tank sludge, industrial waste sludge, etc. (hereinafter simply referred to as “sludge”) are collected regularly (once a year) or as needed by sludge trucks and sent to designated disposal sites. Being transported. In the case of the septic tank sludge, sewerage is spreading nationwide in urban areas, but there is a tendency to decrease. Tend to. This is due to the widespread use of a combined septic tank that treats domestic wastewater from a conventional single septic tank only for human waste.

  In the case of the septic tank sludge, a large amount of water is collected together with the sludge. Therefore, in a sludge collection vehicle with a limited tank capacity, there are few septic tanks that can collect sludge in a single collection operation, resulting in poor operational efficiency. There is.

  Therefore, a sludge concentrating vehicle that collects only the solid content in the collected sludge and attempts to improve operational efficiency has been proposed. In the case of this sludge concentrating vehicle, a tank having a sludge storage tank and a coagulation reaction chamber is provided, and a sludge separator provided with a screen is provided apart from the tank (for example, see Patent Document 1).

As another prior art, there is a tank in which a stock solution tank and a sludge tank are integrated, and a cylindrical small drum screen having an inclined rotation shaft is provided above the sludge tank (for example, Patent Documents). 2).
Japanese Patent Laid-Open No. 2004-100221 (Page 7, FIGS. 2 and 3) Japanese Utility Model Publication No. 61-45920 (page 3-4, FIG. 4)

  However, since Patent Document 1 has a configuration in which a sludge separator provided with a screen is installed apart from a tank, each configuration is connected by a very large number of pipes, and many of them open and close those pipes. This valve is required. Therefore, in this patent document 1, a lot of time and labor are required for connection of pipes at the time of manufacture, and complicated opening / closing operations of these pipes are required at the time of operation. However, the number of skilled workers is greatly reduced, making it difficult to efficiently operate the sludge concentrating vehicle with efficient operation.

  In the case of Patent Document 2 as well, a plurality of pipes connected to a drum screen provided above the tank extend to the upper part of the tank, and many valves for opening and closing the pipes need to be provided around the tank. Therefore, this Patent Document 2 also requires a lot of time and labor for connecting pipes at the time of manufacture, and complicated opening and closing operations of these pipes are necessary at the time of operation. However, the number of skilled workers is greatly reduced, making it difficult to efficiently operate the sludge concentrating vehicle with efficient operation.

  This also applies to sludge concentrators other than sludge concentrators, and the number of skilled workers is greatly reduced, making it difficult to efficiently operate sludge concentrator vehicles with efficient operation.

  On the other hand, as described above, there are many mountain villages in the area where the septic tank remains, so the operation efficiency is increased by increasing the number of septic tanks that can collect sludge in one collection operation by concentrating sludge. There is also a demand to collect only sludge quickly in a place where is not installed and to collect it more efficiently.

  In addition, the water after collecting sludge from the raw sludge water in the septic tank is returned to the septic tank as tension water, greatly reducing the amount of new tension water and reducing the supply time of the tension water. There is also a request for reuse. Moreover, when this water is returned as the septic tank water, it is desired to return the water smoothly into the septic tank.

  Therefore, the present invention includes a reaction tank and a sludge tank, and a sludge concentrator capable of smoothly performing sludge concentration work by pumping the sewage sucked into the reaction tank to the sludge tank at a preferred flow rate, and a sludge concentrator equipped with the same. The purpose is to provide.

  In order to achieve the above object, a sludge concentrating apparatus of the present invention comprises a tank in which a sludge tank and a reaction tank are separated by a partition, a pump for depressurizing or pressurizing the inside of the tank, and a communication between the pump and the inside of the tank. Alternatively, a suction / pressure switching valve that shuts off, a sludge suction pipe that sucks raw sludge water into the sludge tank, and the sludge tank or the reaction tank communicate with each other, or a tank that communicates the sludge tank with the reaction tank. The pressure reducing means for lowering the sludge tank pressurizing pressure of the tank to be lower than the reaction tank pressurizing pressure is provided in a path that includes the switching valve and communicates the suction / pressurization switching valve with the inside of the tank. The “raw sludge water” in the specification and the claims is “sludge water” including “sludge”, and refers to “sludge” to be sucked. According to such a configuration, the reaction tank and the sludge tank are connected with the tank switching valve, the suction / pressure switching valve is switched, the inside of the reaction tank is pressurized with the pump, and the sewage in the reaction tank is pumped to the sludge tank. When adjusting the pressure in the sludge tank, the pressure in the sludge tank is adjusted to a pressure lower than the pressure in the reaction tank so that there is a pressure difference between the two tanks, so that the sewage can be smoothly pumped from the reaction tank to the sludge tank. it can.

  Further, if the pressure reducing means is provided with a function of reducing the pressure of the sludge tank to a pressure lower than the pressure of the reaction tank and higher than the atmospheric pressure, the inside of the reaction tank into the sludge tank. In addition to the pumping of sewage, it is possible to pump sewage smoothly from the sludge tank to the outside.

  Further, if the pressure reducing means is constituted by a pressure reducing valve and has a pressure difference of about 0.2 MPa between the pressure in the sludge tank and the pressure in the reaction tank, the pressure in the reaction tank and the pressure in the sludge tank The sewage can be pumped smoothly with a small pressure difference as the difference between

  Further, in this sludge concentrating device, a sludge separation means is provided in the sludge tank, a separation water receiver for collecting separated water separated from the sludge is provided in the sludge separation means, a water amount detection means is provided in the separation water receiver, A control mechanism for increasing the pressure difference between the reaction tank pressurization pressure and the sludge tank pressurization pressure may be provided based on the water amount decrease signal of the water amount detection means. As a result, the amount of sewage pumped from the reaction tank to the sludge tank can be adjusted according to the amount of separated water collected in the separation water receiver after separating the sludge from the sewage, and smooth and stable sewage Can be discharged.

  Further, in this sludge concentrating device, the control mechanism is an open / close valve that shuts off a path that connects the suction / pressurization switching valve and the sludge tank when the water amount detecting means detects a water amount decrease signal of the separated water receiver. It may be configured. Thereby, the quantity of the sewage pumped from a reaction tank to a sludge tank can be adjusted with a simple structure.

  Further, in the sludge concentrating device, the water amount detecting means is provided with a liquid level detector for detecting the liquid level of the separated water receiver, and a control device for opening and closing the on-off valve based on a signal of the liquid level detector is provided. May be. Thereby, based on the signal from the liquid level detector provided in the separated water receiver, the amount of sewage pumped from the reaction tank to the sludge tank can be easily adjusted.

  In these sludge concentrators, a check valve may be provided in a path for pumping sewage from the reaction tank to the sludge tank. As a result, even if a water head difference is generated between the sewage surface in the reaction tank and the sewage supply unit in the sludge tank, which offsets the pressure difference between the sludge tank pressurization pressure and the reaction tank pressurization pressure, the sludge separation means Therefore, it is possible to prevent the sewage from flowing back to the reaction tank side.

  On the other hand, the sludge concentration vehicle of the present invention includes any one of these sludge concentration apparatuses. By providing such a sludge concentrating device in a sludge concentrating vehicle, for example, sludge that sucks septic tank sludge in a mountain village, collects sludge from the sucked raw sludge water, and can return sludge smoothly as tension water. A concentrated vehicle can be constructed.

  According to the present invention, it is possible to provide a sludge concentrator capable of exerting a stable sludge concentration function by smoothly pumping sewage from a reaction tank to a sludge separation means of a sludge tank by means as described above.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing a sludge concentrating vehicle according to the first embodiment of the present invention, and FIG. 2 is a plan view of the sludge concentrating vehicle shown in FIG. The overall configuration of the sludge concentration vehicle 1 equipped with the sludge concentration device 20 will be described based on these drawings. In the following description, the front side, rear side, left side, and right side refer to the front side, rear side, port side, and starboard side of the vehicle. In the following explanation, “primary sewage” is “sewage” obtained by separating “sludge” from the “raw sludge water”, and “secondary sewage” is coagulated from the “primary mud water” to form a floc. This refers to “sewage” from which “sludge” has been separated. These “primary sewage” and “secondary sewage” are “separated water” in the document of this specification and claims.

  As shown in FIG. 1, a traveling engine E is provided below the driver seat 2 of the sludge concentrating vehicle 1, and the engine E is provided with a PTO 21 (Power Take Off) for taking out power. A vehicle body frame 3 is provided from the driver's seat 2 toward the rear, a subframe 4 is provided on the upper portion of the vehicle body frame 3, and a sludge concentrating device 20 is mounted on these frames 3 and 4. A tank 5 extending in the front-rear direction of the vehicle is mounted on the subframe 4, and two tanks, a reaction tank 7 and a sludge tank 8, separated by a partition wall 6, are formed in the tank 5. The reaction tank 7 is provided on the front side of the vehicle, and the sludge tank 8 is provided on the rear side. A hose reel 9 for sucking raw sludge water into the tank 5 is provided at the upper part of the tank 5. The hose reel 9 stores, for example, a several tens meter sludge suction pipe (resin hose, etc.).

  A float valve 10 is provided in the upper part of the reaction tank 7, and a drum screen 11 as a sludge separation means is provided in the sludge tank 8. By providing the drum screen 11 as the sludge separation means in the sludge tank 8, the configuration and piping for sealing the drum screen 11 are reduced, thereby reducing the number of piping and the number of switching valves.

  Further, on the left side of the vehicle, there is provided an operation panel 17 provided with instruments such as a condensed liquid tank 12, an oil separator 13, an air separator 15, an engine tachometer and a tank pressure gauge. A confirmation window 18 for confirming the amount of primary sewage in the reaction tank 7 and a confirmation window 19 for confirming the amount of sludge stored in the sludge tank 8 are provided on the left side of the tank 5. As shown in FIG. 2, an overflow safety valve 14 and a water tank 16 are provided on the right side of the vehicle.

  FIG. 3 is a piping system diagram of the sludge concentrating device mounted on the sludge concentrating vehicle shown in FIGS. FIG. 3 shows a state when the raw sludge water in the septic tank is sucked. The piping system of the sludge concentrator 20 will be described below with reference to FIG. A pump 22 driven by the power extracted by the PTO 21 is provided, and air is sucked into the pump 22 via a check valve 23. An oil separator 13 is provided on the discharge side of the pump 22 to remove oil in the discharged air. On the downstream side of the oil separator 13, the inside of the reaction tank 7 and the sludge tank 8 in the tank 5 is depressurized (negative pressure) or the reaction tank 7 and the sludge tank 8 are discharged by discharging air from the pump 22 to the discharge pipe 24. A suction / pressurization switching valve 25, which is a four-way valve that switches when the inside is pressurized, is provided. The atmosphere release pipe 26 connected to the suction / pressurization switching valve 25 is opened to the atmosphere 27 via a silencer 37. The discharge pipe 24 is provided with a branch pipe 28, and the branch pipe 28 is provided with a relief valve 29 that opens at a predetermined set pressure. The relief valve 29 is set to a set pressure that allows the air discharged from the pump 22 to escape to the atmosphere 27 when the pressure on the suction / pressurization switching valve 25 side increases. On the upstream side of the check valve 23, there is provided an on-off valve 30 that is normally closed for use during maintenance inspections.

  The suction / pressurization switching valve 25 is connected to a first air pipe 31 that communicates with the check valve 23 and a second air pipe 32 that communicates with the tank 5 side. By switching the suction / pressurization switching valve 25, the first air pipe 31, the second air pipe 32, the discharge pipe 24, and the atmosphere release pipe 26 are switched. With such a pipe configuration, the pump 22 can perform pressure reduction for sucking air in the reaction tank 7 and the sludge tank 8 and pressure for discharging air into the reaction tank 7 and the sludge tank 8. It is like that.

  Further, the second air pipe 32 is connected via the air separator 15 to a third air pipe 33 communicating with the reaction tank 7 of the tank 5 and a fourth air pipe 34 communicating with the sludge tank 8. A float valve 10 for stopping the flow to the pump 22 when the reaction tank 7 is full is provided on the reaction tank 7 side of the third air pipe 33, and a float valve 10 is provided on the connection side with the fourth air pipe 34. An overflow safety valve 14 is provided so that sludge and water do not flow to the pump 22 side even when overflowing.

  The fourth air pipe 34 is provided with a pressure reducing valve 36 as a pressure reducing means for providing a pressure difference between the internal pressure of the reaction tank 7 and the internal pressure of the sludge tank 8 during pressurization. By this pressure reducing valve 36, the pressure of the pressurized air supplied from the pump 22 to the reaction tank 7 and the sludge tank 8 is increased, and the pressure of the pressurized air supplied to the sludge tank 8 is supplied to the reaction tank 7. The pressure is adjusted to be reduced by a predetermined pressure from the air pressure. Thereby, the internal pressure of the sludge tank 8 can be made lower than the internal pressure of the reaction tank 7 at the time of pressurization of the tank 5, and it is set as the pressure difference of reaction tank 7> sludge tank 8> atmosphere. That is, the internal pressure of the sludge tank 8 is adjusted to be slightly lower than the internal pressure of the reaction tank 7 and slightly higher than the atmospheric pressure. In this embodiment, each pressure difference is set to about 0.2 MPa as these pressure differences.

  Thus, by giving a pressure difference (differential pressure) between the compressed air supplied to the reaction tank 7 and the compressed air supplied to the sludge tank 8, the primary sewage in the reaction tank 7 is reduced as described later. When pressure is fed from the first sludge pipe 43 to the drum screen 11 via the second sludge pipe 44, the pressure in the reaction tank 7 pressurized by a predetermined pressure and the inside of the third sludge pipe 46 of the sludge tank 8 released to the atmosphere The pressure in the sludge tank 8 can be adjusted to an intermediate pressure with the pressure of the primary sewage smoothly by reducing the transfer pressure difference of the primary sewage pumped from the reaction tank 7 to the sludge tank 8. I am doing so.

  According to these structures, it functions as follows. When the suction / pressurization switching valve 25 is switched to the left suction position a shown in the figure, the discharge pipe 24 of the pump 22 and the atmosphere release pipe 26 communicate with each other, and the first air pipe 31 and the second air pipe 32 communicate with each other. To do. If the pump 22 is driven in this state, the air in the reaction tank 7 is sucked from the air separator 15 to the second air pipe 32 and the first air pipe 31 via the third air pipe 33, and from the discharge pipe 24. It is emitted to the atmosphere 27 through the atmosphere opening pipe 26.

  Further, when the suction / pressurization switching valve 25 is switched to the middle positive position b in the center, the atmosphere release pipe 26 and the second air pipe 32 communicate with each other, and the discharge pipe 24 of the pump 22 and the first air pipe 31 communicate with each other. . In this state, the reaction tank 7 and the sludge tank 8 are open to the atmosphere via the second air pipe 32 and the open air pipe 26.

  Further, when the suction / pressurization switching valve 25 is switched to the right pressurization position c shown in the figure, the discharge pipe 24 of the pump 22 and the second air pipe 32 communicate with each other, and the atmosphere release pipe 26 and the first air pipe 31 Communicate. When the pump 22 is driven in this state, the atmosphere is sucked into the pump 22 from the atmosphere opening pipe 26 via the first air pipe 31, and the pressurized air discharged from the pump 22 is discharged into the discharge pipe 24, suction / pressurization switching. Via the valve 25 and the second air pipe 32, the pressure is reduced by a predetermined pressure from the third air pipe 33 to the reaction tank 7 and from the fourth air pipe 34 by the pressure reducing valve 36, and is supplied to the sludge tank 8. This is a path through which the suction / pressurization switching valve communicates with the inside of the tank 5.

  On the other hand, as described above, the drum screen 11 is provided in the sludge tank 8 as sludge separation means for separating the sludge content in the sucked raw sludge water. The drum screen 11 is provided with a cylindrical screen body 60 in which a rotation axis is disposed in the horizontal direction. A separation water receiver 38 (water container) is provided at the lower part of the screen main body 60, and the lower part of the cylindrical screen main body 60 is configured to always rotate within the separation water receiver 38. Thereby, the surface of the screen main body 60 is prevented from being dried and causing a function deterioration. The screen body 60 is rotationally driven by a hydraulic motor 40 driven by oil supplied from a hydraulic pump 39 driven by the PTO 21. 41 shown is a relief valve set to a predetermined pressure, and 42 is an oil tank.

  Furthermore, between the reaction tank 7 and the sludge tank 8, the 1st sludge pipe | tube 43 provided in the reaction tank 7, and the 2nd sludge pipe | tube which supplies raw sludge water or primary sludge water to the drum screen 11 of the sludge tank 8 A tank switching valve 45 that is a four-way valve that communicates with or shuts off 44 is provided. In addition, the tank switching valve 45 includes a third sludge pipe 46 for discharging primary sewage or secondary sewage from the separation water receiver 38 of the drum screen 11, and a fourth sludge pipe 47 connected to the hose reel 9. It is connected. The hose reel 9 is provided with a sludge suction pipe 51 extending to the septic tank 50. This is a path for discharging the sewage from the drum screen 11 to the outside through the sludge suction pipe 51. Further, an air suction valve 48 for sucking air into the sludge tank 8 is provided in the middle of the second sludge pipe 44. The fourth sludge pipe 47 is provided with a pressurizing valve 49 that closes when the tank 5 is pressurized.

  According to these structures, it functions as follows. When the tank switching valve 45 is switched to the right sludge tank position d shown in the figure, the fourth sludge pipe 47 and the second sludge pipe 44 communicate with each other, and the third sludge pipe 46 and the first sludge pipe 43 communicate with each other. If the pressure in the reaction tank 7 is reduced in this state, the raw sludge water is sucked from the fourth sludge pipe 47 to the drum screen 11 in the sludge tank 8, and the primary sludge from which the sludge has been separated by the drum screen 11 is received as separated water. 38 is sucked into the reaction tank 7 through the third sludge pipe 46 and the first sludge pipe 43.

  The reaction tank 7 is connected with an aggregate liquid supply pipe 55, and the aggregate liquid supply pipe 55 is connected to the aggregate liquid tank 12 via an aggregate liquid valve 56. When supplying the aggregate liquid, the required amount of aggregate liquid is supplied from the aggregate liquid tank 12 to the primary sewage in the reaction tank 7 whose pressure has been reduced by manually opening or closing the aggregate liquid valve 56. In this embodiment, the flocculated liquid supply pipe 55 is connected to the reaction tank 7, but the flocculated liquid supply pipe 55 is connected to the first sludge pipe 43, and the flocculated liquid supply pipe is negatively pressured by reducing the pressure of the reaction tank 7. The condensed liquid may be sucked into the reaction tank 7 from 55 through the first sludge pipe 43.

  Further, when the tank switching valve 45 is switched to the intermediate two tank connection position e shown in the figure, the first sludge pipe 43 and the second sludge pipe 44 communicate, and the third sludge pipe 46 and the fourth sludge pipe 47 communicate. To do. If the inside of the reaction tank 7 and the sludge tank 8 is pressurized in this state, the inside of the sludge tank 8 is opened to the atmosphere via the third sludge pipe 46 and the fourth sludge pipe 47, so The primary sewage is pumped to the drum screen 11 in the sludge tank 8 through the first sludge pipe 43 and the second sludge pipe 44. This is a path for pumping the primary sewage from the reaction tank 7 to the sludge tank 8.

  Further, a discharge valve 53 for discharging the sludge in the sludge tank 8 is provided at the lower rear end of the sludge tank 8. By opening the discharge valve 53 and pressurizing the sludge tank 8, the sludge accumulated in the sludge tank 8 is discharged to the disposal site 54 through the sludge discharge pipe 52.

  The pump 22, the hydraulic motor 40 and the like are provided below the tank 5 in the rear part of the driver seat 2 shown in FIGS. 3 that appear in FIGS. 1 and 2 are given the same reference numerals in FIGS. Further, the sludge concentrator 20 of this embodiment is provided with the suction / pressurization switching valve 25, the tank switching valve 45, the pressurization valve 49 and the operation panel 17 on the left side of the tank 5, so that the operator can concentrate sludge. A series of operations can be easily performed on the left side of the apparatus 20.

  FIG. 4 is a work content diagram in the configuration of the piping system diagram shown in FIG. As shown in FIG. 4, there are five main operations for sucking and concentrating septic tank sludge by the sludge concentrator 20: raw sludge water suction, agglomeration reaction, release to the atmosphere, sludge concentration, discharge valve discharge. . In FIG. 4, each of these operations, the operation state of each valve at each operation, the internal pressure of the sludge tank 8 and the reaction tank 7, and the presence or absence of sludge water are summarized in a list format. The operations in each column will be described below with reference to FIGS.

  5 is a piping system diagram at the time of sucking raw sludge water in the work content diagram shown in FIG. 4, FIG. 6 is a piping system diagram at the time of agglomeration reaction in the reaction tank in the work content diagram shown in FIG. 4 is a piping system diagram when the atmosphere is released in the work content diagram shown in FIG. 4, FIG. 8 is a piping system diagram during sludge concentration in the work content diagram shown in FIG. 4, and FIG. 9 is a discharge valve in the work content diagram shown in FIG. It is a piping system figure at the time of discharge from.

  As shown in FIG. 5, when the raw sludge water is sucked, the tip of the sludge suction pipe 51 is inserted into the septic tank 50, the tank switching valve 45 is switched to the sludge tank position d with the pressurizing valve 49 opened, and suction is performed. The pressurization switching valve 25 is switched to the suction position a. Then, by driving the pump 22, the air in the reaction tank 7 is sucked and the pressure in the reaction tank 7 is reduced. As a result, the inside of the sludge tank 8 is depressurized via the first sludge pipe 43 and the third sludge pipe 46, and the sludge tank 8 is passed through the fourth sludge pipe 47 and the second sludge pipe 44 from the sludge suction pipe 51. Raw sludge water is sucked into the drum screen 11 provided. The sucked raw sludge is separated by the screen body 60 of the drum screen 11, and the primary sludge from which the sludge has been separated is separated from the separated water receiver 38 through the third sludge pipe 46 and the first sludge pipe 43. To the reaction tank 7. This is a path for sucking raw sludge water from the sludge suction pipe 51 into the sludge tank 8 and separating the sludge with the drum screen 11, and the primary sludge separated with the drum screen 11 from the sludge tank 8. And a path for suctioning into the reaction tank 7. By this operation, sludge is stored in the sludge tank 8 and primary sludge is stored in the reaction tank 7.

  By this operation, primary sludge water sucked into the tank 5 is subjected to primary filtration, and scum, precipitated sludge and the like in the septic tank 50 are stored in the sludge tank 8 from the drum screen 11 and filtered through the drum screen 11. Only the sewage is sucked into the reaction tank 7. The suction of raw sludge water by this operation is a vacuum function, and scum and precipitated sludge can be efficiently sucked into the sludge tank 8. Moreover, only one sludge can be efficiently stored in the sludge tank 8 through the drum screen 11 in the original sludge water having a large amount of sludge and the raw sludge having a small amount of sludge by one suction operation. Since only the sewage can be sucked, efficient raw sludge water suction and sludge separation can be performed continuously.

  As shown in FIG. 6, at the time of agglomeration reaction of the primary sewage sucked into the reaction tank 7, the tip of the sludge suction pipe 51 is taken out from the purification tank 50, and the tank switching valve 45 is switched to the reaction tank position f. The suction / pressurization switching valve 25 is at the suction position a, and the air in the reaction tank 7 is sucked by driving the pump 22. At the same time, a predetermined amount of the flocculated liquid is supplied from the flocculated liquid tank 12 into the reaction tank 7. This is a path for supplying the aggregated liquid to the primary sewage sucked into the reaction tank 7. The amount of the flocculated liquid is determined by the amount of primary sewage sucked into the reaction tank 7 and the like. At the same time, air is sucked into the reaction tank 7 from the sludge suction pipe 51, and the primary sewage in the reaction tank 7 is stirred with air. This is a path for sucking air and stirring the primary sewage in the reaction tank 7. Thereby, promotion of the aggregation reaction of primary sewage is achieved. During this operation, there is sludge in the sludge tank 8 and primary sewage in the reaction tank 7.

  As shown in FIG. 7, when the atmosphere is released, the suction / pressurization switching valve 25 is switched to the neutral position b, and the air suction valve 48 of the second sludge pipe 44 is opened. As a result, the reaction tank 7 is opened to the atmosphere by the third air pipe 33 communicating with the atmosphere opening pipe 26 via the second air pipe 32. Further, the sludge tank 8 is opened to the atmosphere via the second sludge pipe 44 and the air suction valve 48. This is a path that opens the sludge tank 8 to the atmosphere. During this operation, there is sludge in the sludge tank 8 and primary sewage in the reaction tank 7.

  As shown in FIG. 8, at the time of sludge concentration, the tank switching valve 45 is switched to the two tank connection position e, and the suction / pressure switching valve 25 is switched to the pressure position c. The air intake valve 48 of the second sludge pipe 44 is closed. The separation water receiver 38 provided on the drum screen 11 of the sludge tank 8 is connected to the sludge suction pipe whose tip is inserted into the septic tank 50 via the third sludge pipe 46, the tank switching valve 45, and the fourth sludge pipe 47. 51 is communicated. Then, by driving the pump 22, the atmosphere is sucked into the pump 22 via the suction / pressurization switching valve 25 from the atmosphere opening pipe 26, and the reaction tank 7 is sucked from the pump 22 via the suction / pressurization switching valve 25. Pressurized air is supplied to the inside and the sludge tank 8. At this time, since the inside of the sludge tank 8 communicates with the septic tank 50 under atmospheric pressure as described above, the primary sewage in the pressurized reaction tank 7 becomes the first sludge pipe 43, the tank switching valve 45, the second It is pumped to the drum screen 11 in the sludge tank 8 having a low pressure through the sludge pipe 44.

  At this time, the pressure of the pressurized air supplied to the sludge tank 8 is reduced from the pressure of the pressurized air supplied to the reaction tank 7 by the pressure reducing valve 36 provided in the fourth air pipe 34. Yes. Thereby, a pressure difference (differential pressure) is given to the compressed air supplied to the reaction tank 7 and the compressed air supplied to the sludge tank 8. Due to this pressure difference, as described above, the relationship between the pressure in the reaction tank 7, the sludge tank 8, and the atmosphere is: reaction tank 7> sludge tank 8> atmosphere. Thus, by adjusting the pressure difference (differential pressure) between the compressed air supplied to the reaction tank 7 and the compressed air supplied to the sludge tank 8, the primary sewage in the reaction tank 7 is discharged from the first sludge pipe 43. The pressure difference between the reaction tank 7 and the sludge tank 8 when being pumped to the drum screen 11 via the two sludge pipe 44 is reduced, and the smooth primary sewage is pumped. The primary sewage pumped to the drum screen 11 is separated and concentrated by the screen body 60 of the drum screen 11. By this operation, the primary sewage in the reaction tank 7 is pumped into the sludge tank 8, and the reaction tank 7 has no primary sewage. There is sludge in the sludge tank 8.

  By this operation, the secondary filtration of the primary sewage is performed, and the floc sludge that has been coagulated in the reaction tank 7 is stored in the sludge tank 8 from the drum screen 11. This is a concentration function for concentrating the primary sewage in the reaction tank 7 by the drum screen 11 as the sludge separation means. Further, since the secondary sewage filtered by the drum screen 11 is water from which the sludge is further removed from the primary sewage, the third sludge pipe 46, the tank switching valve 45, and the fourth sludge pipe 47 are separated from the separated water receiver 38. And discharged from the sludge suction pipe 51 as the septic water of the septic tank 50. This is a path for discharging secondary sewage from the sludge suction pipe 51 to the outside.

  As shown in FIG. 9, at the time of discharge from the discharge valve, the tank switching valve 45 is switched to the reaction tank position f, and the suction / pressure switching valve 25 is switched to the pressure position c and discharged at the disposal site 54. Valve 53 is opened. Then, by driving the pump 22, the atmosphere is sucked into the pump 22 from the atmosphere opening pipe 26 via the suction / pressurization switching valve 25, and the suction / pressurization switching valve 25 and the second air pipe 32 are pumped from the pump 22. Then, pressurized air is supplied from the third air pipe 33 into the reaction tank 7 and from the fourth air pipe 34 into the sludge tank 8. At this time, since the inside of the reaction tank 7 is closed by closing the pressurizing valve 49, the pressurized air is supplied only into the sludge tank 8, and the sludge stored in the sludge tank 8 by this pressurized air is discharged as sludge. It is discharged from the pipe 52 to the disposal site 54, and sludge can be reliably discharged. By this operation, the sludge in the sludge tank 8 is discharged, and there is no sludge in the sludge tank 8.

  FIG. 10 is a side view showing the sludge concentrating vehicle 121 according to the second embodiment of the present invention, FIG. 11 is a plan view of the sludge concentrating vehicle 121 shown in FIG. 10, and FIG. 12 is the sludge shown in FIG. It is a rear view of the concentration wheel 121. Since the second embodiment is different from the first embodiment in the arrangement of pipes and the like, different parts will be described, the same components will be denoted by the same reference numerals, and detailed description thereof will be omitted. To do.

  As shown in FIGS. 10 and 11, the sludge concentrator 120 according to the second embodiment is a four-way valve tank that is switched to the left side of the rear portion of the tank 5 when the raw sludge water is sucked into or discharged from the tank 5. A switching valve 45 is provided. The tank switching valve 45 includes a fourth sludge pipe 47 connected to the sludge suction pipe 51, a second sludge pipe 44 that sucks raw sludge water and the like into the sludge tank 8, and discharges sewage from the sludge tank 8. The 3rd sludge pipe | tube 46 to be connected and the 1st sludge pipe | tube 43 connected to the inside of the reaction tank 7 are connected.

  The fourth sludge pipe 47 is provided with a pressurizing valve 49 as an on-off valve, and an auxiliary suction pipe 97 is provided at the vehicle rear position of the fourth sludge pipe 47. The auxiliary suction pipe 97 is provided with an auxiliary suction valve 98. The auxiliary suction valve 98 is provided on one side of the rear portion of the tank 5 and is provided so as to open toward the rear of the tank 5. A hose support member 110 is provided at the rear end of the tank 5 toward the rear, and a short hose 111 (for example, a suction pipe of about several meters to several tens of meters) is hung on the hose support member 110. Yes. The short hose 111 is set to a length suitable for work at a short distance. The short hose 111 is also used as a disposal site discharge hose.

  Further, on the left side of the front portion of the tank 5, there is provided a four-way valve suction / pressurization switching valve 25 that switches when the inside of the tank 5 is depressurized or pressurized. An oil separator 13, an air separator 15, an air release pipe 26, and an overflow safety valve 14 are connected to the suction / pressurization switching valve 25. The overflow safety valve 14 is connected to the upper part of the reaction tank 7 via the float valve 10.

  Further, a flocculated liquid tank 12 is provided on the left side of the vehicle, and a flocculated liquid tank 12, a water tank 16, and a water pump 57 are provided on the right side of the vehicle as shown in FIG. The aggregate liquid is stored in the aggregate liquid tank 12. As shown in FIG. 10, a confirmation window 18 for confirming the amount of primary sewage in the reaction tank 7 is provided on the left side of the tank 5, and the amount of sludge stored in the sludge tank 8 is confirmed at the rear of the tank 5. A confirmation window 19 is provided.

  As shown in FIGS. 10 and 12, on the left side of the rear portion of the tank 5, a pressure switching valve operating lever 101 for operating the suction / pressure switching valve 25 and a tank switching valve 45 are operated. The tank switching valve operating lever 102 is provided. These operation levers 101 and 102 are provided on a lever mounting plate 103 protruding from the tank 5 toward the left side. The pressure switching valve operating lever 101 is connected to the suction / pressurization switching valve 25 by a rod-shaped connecting member 104, and the tank switching valve operating lever 102 is connected to the tank switching valve 45 by a rod-shaped connecting member 105. . The pressure switching valve operating lever 101 and the tank switching valve operating lever 102 are rotated in a plane orthogonal to the axial direction of the connecting members 104 and 105, so that the suction / pressurization switching valve 25 and the tank switching valve 45 are controlled. Switching operation can be performed.

  Furthermore, an instrument mounting portion 106 projects from the subframe 4 toward the left side below the operation levers 101 and 102. The instrument mounting portion 106 includes a tank pressure gauge 107 (compound gauge) that displays the pressure in the reaction tank 7, a tank pressure gauge 108 (coupled gauge) that displays the pressure in the sludge tank 8, and a manual And a throttle lever 109 for raising and lowering the rotational speed of the pump 22 (see FIG. 15) by raising and lowering the rotational speed of the engine E.

  FIG. 13 is a partial cross-sectional view of the drum screen provided in the sludge concentrating vehicle of FIG. 10 as viewed from the rear of the vehicle, and FIG. 14 is a view of the drum screen shown in FIG. It is.

  As shown in FIGS. 13 and 14, the drum screen 11, which is a sludge separating means provided in the upper part of the sludge tank 8, is provided inside the sludge tank 8 from a mounting base 62 provided in the sludge tank 8. The drum screen 11 includes a rotary drum 67, a screen main body 60 provided on the rotary drum 67, and a scraper that scrapes off sludge adhering to the surface of the screen main body 60 on the sludge discharge side (right side in FIG. 13) of the screen main body 60. 79.

  In the drum screen 11, the configuration of the rotating drum 67, the screen main body 60, the scraper 79, and the like can be integrally removed from the sludge tank 8. In addition, by providing the drum screen 11 in the sludge tank 8, the number of the configuration for sealing the drum screen 11, the piping for supplying / discharging sludge water to the drum screen 11 and the number of switching valves can be reduced. To simplify the configuration. In addition, the switching valve can be reduced by simplifying the piping configuration.

  On the other hand, in the upper part of the sludge tank 8 where the drum screen 11 is provided, a separation water receiver 38 is provided between the two support frames 72 provided downward from the mounting base 62. This separation water receiver 38 is sludge after sludge is separated by the screen main body 60 ("separation water" in the document of this specification and claims is separated by sludge concentration means). It is formed in such a size that a predetermined amount of separated water can be stored in the lower part of the screen main body 60. The separation water receiver 38 is provided so that the screen surface passes through the water stored in the separation water receiver 38 when the screen body 60 rotates. The separation water receiver 38 in this example is formed in a bowl shape extending between the support frames 72.

The separation water receiver 38 is provided with a liquid level switch 82 (liquid level detector) as water amount detection means for detecting the amount of water in the separation water receiver 38. The liquid level switch 82 detects whether or not the amount of sewage in the separation water receiver 38 satisfies a predetermined amount of water.
On the basis of the detection signal of the liquid level switch 82, an on-off valve 83 (electromagnetic valve), which will be described later, operates, and the amount of water in the separated water receiver 38 is adjusted. In this example, the liquid level of the separated water is detected by one liquid level switch 82, but two liquids separated at a predetermined interval in the vertical direction so that the liquid level in the separated water receiver 38 has a predetermined width. A surface switch may be provided, and the on-off valve 83 described later may be operated by detecting the minimum water amount with the lower liquid level switch and the maximum water amount with the upper liquid level switch. Thus, the secondary sludge can be discharged more smoothly from the third sludge pipe 46 while avoiding frequent operation of the on-off valve 83. The water amount detecting means may be any means capable of detecting the amount of water in the separated water receiver 38, and is not limited to this embodiment.

  As shown in FIG. 13, a sludge water diffusion portion 90 fixed to the peripheral wall of the sludge tank 8 is provided on the left side portion of the sludge tank 8 where the drum screen 11 is provided. A supply pipe 93 connected to the second sludge pipe 44 (see FIG. 11) of the tank switching valve 45 provided at the side of the sludge tank 8 is connected to the sludge water diffusion section 90. The supply pipe 93 extends laterally into the sludge tank 8 from the tank switching valve 45, bends upward below the sludge water diffusion part 90, and opens inside the sludge water diffusion part 90.

  Further, a drain pipe 95 extending in the horizontal direction is provided on the lower left side of the separation water receiver 38. The drain pipe 95 extends in the horizontal direction from the separated water receiver 38 and is provided with a pipe flange 96 at a portion protruding to the outside of the sludge tank 8. The third sludge pipe 46 (FIG. 15) is connected to the pipe flange 96. The configuration relating to the separated water receiver 38, the sludge water diffusion section 90, the supply pipe 93, and the drain pipe 95 is provided on the sludge tank 8 side.

  FIG. 15 is a piping system diagram of the sludge concentrating device mounted on the sludge concentrating vehicle shown in FIGS. FIG. 15 illustrates a state when the raw sludge water in the septic tank is sucked. This FIG. 15 also explains a different part from the piping system diagram of FIG. 3, the same components as those in FIG. 3 are denoted by the same reference numerals, and detailed description thereof is omitted. As shown in FIG. 15, in this embodiment, an air separator 15 is provided in the first air pipe 31, and a branch pipe 28 is provided between the second air pipe 32 and the atmosphere release pipe 26. . The branch pipe 28 is provided with a relief valve 29 that is opened at a predetermined set pressure. The relief valve 29 allows air to escape to the atmosphere 27 when the pressure in the second air pipe 32 rises. The set pressure is reached.

  In the second embodiment, the fourth air pipe 34 is provided with an on-off valve 83 (electromagnetic valve) that opens and closes the fourth air pipe 34. The on-off valve 83 is closed based on the separated water decrease signal of the liquid level switch 82 provided in the separated water receiver 38, and is opened based on the separated water increase signal. The fourth air pipe 34 is provided with a check valve 35 between the on-off valve 83 and the sludge tank 8 for preventing reverse flow of air. The check valve 35 also has a function of reducing the pressure of the pressurized air supplied to the sludge tank 8. Further, the fourth air pipe 34 is provided with a fifth air pipe 114 between the suction / pressurization switching valve 25 side of the on-off valve 83 and the upper part of the sludge tank 8. The fifth air pipe 114 is provided with an air shut-off valve 80 serving as an on-off valve. The air shut-off valve 80 is normally located on the shut-off side, and is switched to the communication side in conjunction with the operation of switching the suction / pressurization switching valve 25 to the center positive position b. The second air pipe 32 is provided with the pressure gauge 107, and the fourth air pipe 34 is provided with the pressure gauge 108.

  According to these structures, it functions as follows. When the suction / pressurization switching valve 25 is switched to the left suction position a shown in the figure, the discharge pipe 24 of the pump 22 and the atmosphere release pipe 26 communicate with each other, and the first air pipe 31 and the second air pipe 32 communicate with each other. To do. If the pump 22 is driven in this state, the air in the reaction tank 7 is sucked into the second air pipe 32 and the first air pipe 31 via the third air pipe 33, and the air separator 15 and the oil separator 13 are connected. Through the discharge pipe 24 and released from the atmosphere open pipe 26 to the atmosphere 27. Further, when the suction / pressurization switching valve 25 is switched to the middle positive position b, the air shutoff valve 80 is switched to the communication side in conjunction with the operation. Thereby, the atmosphere release pipe 26 and the second air pipe 32 communicate with each other, and the third air pipe 33, the fourth air pipe 34, and the fifth air pipe 114 communicate with each other. In this state, the reaction tank 7 passes through the third air pipe 33 and the second air pipe 32, and the sludge tank 8 passes through the fifth air pipe 114, the fourth air pipe 34 and the second air pipe 32. It communicates with the open pipe 26 and enters the atmosphere open state.

  Further, when the suction / pressurization switching valve 25 is switched to the right pressurization position c shown in the figure, the discharge pipe 24 of the pump 22 and the second air pipe 32 communicate with each other, and the atmosphere release pipe 26 and the first air pipe 31 Communicate. When the pump 22 is driven in this state, the atmosphere is sucked into the pump 22 from the atmosphere opening pipe 26 via the first air pipe 31, and the pressurized air discharged from the pump 22 is discharged into the discharge pipe 24, suction / pressurization switching. Via the valve 25 and the second air pipe 32, the third air pipe 33 is supplied to the reaction tank 7 and the fourth air pipe 34 is supplied to the sludge tank 8. At this time, the check valve 35 provided in the fourth air pipe 34 causes the pressurized air, which has been depressurized by a predetermined pressure compared to the pressurized air supplied from the third air pipe 33 to the reaction tank 7, to the fourth air. It is supplied from the pipe 34 to the sludge tank 8.

  On the other hand, between the reaction tank 7 and the sludge tank 8, a first sludge pipe 43 provided in the reaction tank 7 and a second sludge that supplies raw sludge water or primary sludge water to the drum screen 11 in the sludge tank 8. The tank switching valve 45 that communicates with or shuts off the pipe 44 is provided. The tank switching valve 45 is connected to a third sludge pipe 46 that discharges primary sewage or secondary sewage from the separation water receiver 38 of the drum screen 11 and a fourth sludge pipe 47 connected to the hose reel 9. ing. The fourth sludge pipe 47 is provided with a pressurizing valve 49 that closes when the tank 5 is pressurized. The second sludge pipe 44 is provided with a check valve 85 (a check valve) for preventing a reverse flow from the drum screen 11 side to the tank switching valve 45 side.

  Further, a flocculated liquid supply pipe 55 is connected to the first sludge pipe 43, and the flocculated liquid supply pipe 55 is connected to the flocculated liquid tank 12 through a flocculated liquid valve 56. At the time of supplying the aggregate liquid, a necessary amount of the aggregate liquid can be sucked from the aggregate liquid tank 12 into the depressurized reaction tank 7 by opening or closing the aggregate liquid valve 56 manually or automatically. An intake pipe 115 is provided closer to the reaction tank 7 than the aggregate liquid valve 56 of the aggregate liquid supply pipe 55, and an intake valve 116 is provided in the intake pipe 115. From the intake pipe 115, the air can be sucked into the reaction tank 7 through the intake valve 116.

  According to these configurations, the pressurizing valve 49 or the auxiliary suction valve 98 is opened, the tank switching valve 45 is switched to the right sludge tank position d illustrated, and the suction / pressurization switching valve 25 is illustrated to the left suction position a illustrated. When the pressure in the reaction tank 7 is reduced by switching to the first sludge pipe 43 and the third sludge pipe 46, the sludge tank 8 is depressurized, and the raw sludge water is transferred from the septic tank 50 to the drum screen 11 in the sludge tank 8. Sucked. The primary sewage from which the sludge is separated by the drum screen 11 is sucked into the reaction tank 7 from the separated water receiver 38 through the third sludge pipe 46 and the first sludge pipe 43.

  If the pressure valve 49 and the auxiliary suction valve 98 are closed and the suction / pressurization switching valve 25 is set to the left suction position a shown in the drawing to reduce the pressure in the reaction tank 7, the condensed sludge pipe is connected to the first sludge pipe. The flocculent liquid can be supplied through the air supply pipe 43, and the flocculant reaction by the air supply can be performed from the air intake pipe 115 through the flocculant liquid supply pipe 55 and the first sludge pipe 43.

  Further, when the tank switching valve 45 is switched to the intermediate two tank connection position e shown in the figure, the first sludge pipe 43 and the second sludge pipe 44 communicate, and the third sludge pipe 46 and the fourth sludge pipe 47 communicate. To do. If the insides of the reaction tank 7 and the sludge tank 8 are pressurized in this state, the sludge tank 8 communicates with the sludge suction pipe 51 via the third sludge pipe 46 and the fourth sludge pipe 47 in the sludge tank 8. The primary sewage in the tank 7 is pumped to the drum screen 11 in the sludge tank 8 through the first sludge pipe 43 and the second sludge pipe 44. At this time, since a predetermined differential pressure is provided between the pressure of the pressurized air supplied to the reaction tank 7 by the check valve 35 and the pressure of the pressurized air supplied to the sludge tank 8 as described above, a smooth primary Can pump sewage. 15 appearing in FIGS. 10 to 12 are denoted by the reference numerals in FIGS.

  FIG. 16 is a work content diagram in the configuration of the piping system diagram shown in FIG. 15 and shows the work content different from FIG. As the sludge collecting operation shown in FIG. 16, four methods of raw sludge water suction, agglomeration reaction, release to the atmosphere, and sludge concentration are shown. In FIG. 16, these operations, the operation state of each valve at the time of each operation, the internal pressures of the sludge tank 8 and the reaction tank 7 and the like are summarized in a list format. Hereinafter, details of the operations in each column will be described with reference to FIGS.

  FIG. 17 is a piping system diagram at the time of raw sludge water suction in the work content diagram shown in FIG. 16, FIG. 18 is a piping system diagram at the time of agglomeration reaction in the reaction tank in the work content diagram shown in FIG. FIG. 20 is a piping system diagram when the atmosphere is released in the work content diagram shown in FIG. 16, and FIG. 20 is a piping system diagram during sludge concentration in the work content diagram shown in FIG.

  As shown in FIG. 17, when the raw sludge water is sucked, the tip of the sludge suction pipe 51 is inserted into the septic tank 50, the pressurizing valve 49 is opened, and the auxiliary suction valve 98 is closed. Further, the tank switching valve 45 is switched to the sludge tank position d, and the suction / pressurization switching valve 25 is switched to the suction position a. Then, by driving the pump 22, the air in the reaction tank 7 is sucked and the pressure in the reaction tank 7 is reduced. As a result, the inside of the sludge tank 8 is depressurized via the first sludge pipe 43 and the third sludge pipe 46, and the sludge suction pipe 51 enters the sludge tank 8 via the fourth sludge pipe 47 and the second sludge pipe 44. Raw sludge water is sucked into the drum screen 11 provided. The sucked raw sludge water is separated from the sludge by the drum screen 11, and the primary sludge from which the sludge has been separated passes from the separation water receiver 38 through the third sludge pipe 46 and the first sludge pipe 43. 7 is aspirated. As a result, the primary sludge from which the raw sludge water is sucked into the sludge tank 8 and the sludge is separated by the drum screen 11 is sucked from the sludge tank 8 into the reaction tank 7. By this operation, sludge is stored in the sludge tank 8 and primary sludge is stored in the reaction tank 7.

  Also in this embodiment, after sucking into the sludge tank 8, the raw sludge water sucked into the tank 5 is primarily filtered by the drum screen 11 by being sucked from the sludge tank 8 into the reaction tank 7, and the septic tank 50 The scum, precipitated sludge and the like are stored in the sludge tank 8 from the drum screen 11, and only the primary sewage filtered by the drum screen 11 is sucked into the reaction tank 7.

  As shown in FIG. 18, at the time of agglomeration reaction of primary sewage sucked into the reaction tank 7, the pressurizing valve 49 and the auxiliary suction valve 98 are closed, and the tank switching valve 45 is switched to the reaction tank position f. The suction / pressurization switching valve 25 is at the suction position a, and the air in the reaction tank 7 is sucked by driving the pump 22. Then, the aggregation liquid valve 56 is opened, and a predetermined amount of the aggregation liquid is sucked (supplied) from the aggregation liquid tank 12 into the reaction tank 7. The amount of the flocculated liquid is determined by the amount of primary sewage sucked into the reaction tank 7 and the like. Thereafter, the intake valve 116 of the intake pipe 115 is opened at predetermined intervals, air is sucked into the reaction tank 7 from the intake pipe 115 through the first sludge pipe 43, and the primary sewage in the reaction tank 7 is aerated. . Only at this time, the intake valve 116 is opened. This is a path for sucking the flocculated liquid and air and stirring the primary sewage in the reaction tank 7. In this manner, the agglomerated liquid is supplied to the primary sewage in the reaction tank 7 and aeration is performed to promote the agglomeration reaction of the primary sewage, so that the sludge in the primary sewage becomes flocked. During this operation, there is sludge in the sludge tank 8 and primary sewage in the reaction tank 7.

  As shown in FIG. 19, the suction / pressurization switching valve 25 is switched to the neutral position b when the atmosphere is released. The air shutoff valve 80 of the sludge tank 8 is also opened in conjunction with the operation of the suction / pressurization switching valve 25. As a result, the third air pipe 33 of the reaction tank 7 communicates with the atmosphere release pipe 26 via the second air pipe 32 and is opened to the atmosphere. Further, the sludge tank 8 communicates with the atmosphere release pipe 26 through the fifth air pipe 114, the air shutoff valve 80, and the second air pipe 32, and is released into the atmosphere. During this operation, there is sludge in the sludge tank 8 and primary sewage in the reaction tank 7.

  As shown in FIG. 20, at the time of sludge concentration, the tank switching valve 45 is switched to the two tank connection position e, and the suction / pressure switching valve 25 is switched to the pressure position c. Further, the pressurizing valve 49 of the fourth sludge pipe 47 is opened. The auxiliary suction valve 98 of the auxiliary suction pipe 97 is closed. As a result, the separation water receiver 38 provided on the drum screen 11 of the sludge tank 8 passes through the third sludge pipe 46, the tank switching valve 45, and the fourth sludge pipe 47, and the sludge suction whose tip is inserted into the septic tank 50. Communicating with the tube 51. Then, by driving the pump 22, the atmosphere is sucked into the pump 22 via the suction / pressurization switching valve 25 from the atmosphere opening pipe 26, and the reaction tank 7 is sucked from the pump 22 via the suction / pressurization switching valve 25. Pressurized air is supplied to the inside and the sludge tank 8.

  At this time, since a small pressure difference (differential pressure) is provided between the reaction tank 7 and the sludge tank 8 by the check valve 35 provided in the fourth air pipe 34, the primary sewage in the reaction tank 7 is removed. It can be smoothly pumped to the drum screen 11. The primary sewage pumped to the drum screen 11 is subjected to secondary filtration after the floc sludge is separated by the drum screen 11, and the floc sludge condensed and reacted in the reaction tank 7 is discharged from the drum screen 11. It is stored in the sludge tank 8. The secondary sewage (separated water) filtered by the drum screen 11 is stored in the separated water receiver 38, and the separated sludge is passed through the third sludge pipe 46, the tank switching valve 45, and the fourth sludge pipe 47. The water is discharged from the suction pipe 51 to the septic tank 50 as tension water.

  This flow is a normal sludge concentration operation. When the secondary sewage after separating the floc sludge with the drum screen 11 is pumped to the septic tank 50, the primary sewage pumped from the reaction tank 7 to the sludge tank 8 is used. As a result, the amount of water in the separated water receiver 38 changes. When the amount of water in the separation water receiver 38 is reduced, pressure fluctuation (pulsation) due to air mixing or the like may occur in the secondary sewage discharged from the separation water receiver 38.

  Therefore, in this embodiment, the amount of secondary sewage accumulated in the separation water receiver 38 is detected by the liquid level switch 82, and the supply of compressed air supplied from the fourth air pipe 34 to the sludge tank 8 is opened and closed. By controlling with the valve 83, the amount of water in the separated water receiver 38 is kept so as not to become below a certain water level, and air is prevented from being mixed into the secondary sewage discharged from the separated water receiver 38.

  In this control, when it is detected by the liquid level switch 82 that the amount of secondary sewage in the separation water receiver 38 has become a predetermined amount or less, the on-off valve 83 provided in the fourth air pipe 34 is closed, and sludge is collected. The supply of compressed air to the tank 8 is shut off. Thereby, the inside of the sludge tank 8 becomes atmospheric pressure, the pressure difference between the pressure in the reaction tank 7 and the sludge tank 8 becomes large, and the primary sewage pumped from the reaction tank 7 to the drum screen 11 of the sludge tank 8. The amount of increases. Therefore, the amount of primary sewage treated by the drum screen 11 increases, and the amount of secondary sewage stored in the separation water receiver 38 increases. Moreover, since the pressurization pressure in the sludge tank 8 for discharging the secondary sewage from the separated water receiver 38 is low, the discharge amount of the secondary sewage decreases.

  Further, when it is detected by the liquid level switch 82 that the amount of secondary sewage in the separated water receiver 38 has become a predetermined amount or more, the on-off valve 83 provided in the fourth air pipe 34 is opened, and the sludge tank The supply of compressed air to 8 is resumed. As a result, the pressure in the sludge tank 8 is lower than that in the reaction tank 7 and higher than the atmospheric pressure as described above, so that the pressure difference between the pressure in the reaction tank 7 and the sludge tank 8 is reduced. The amount of primary sewage pumped from the reaction tank 7 to the drum screen 11 of the sludge tank 8 is reduced. Moreover, since the pressurization pressure in the sludge tank 8 for discharging the secondary sewage from the separation water receiver 38 is increased, the discharge amount of the secondary sewage is promoted, and the pulsation at the time of discharge is suppressed.

  Thereafter, the adjustment of the amount of primary sewage pumped to the drum screen 11 by opening and closing the on-off valve 83 and the adjustment of the amount of secondary sewage discharged from the separation water receiver 38 are separated water detected by the liquid level switch 82. It repeats according to the water level change of the receptacle 38. In this way, by adjusting the amount of primary sewage pumped from the reaction tank 7 to the sludge tank 8 in accordance with the amount of secondary sewage (separated water) stored in the separated water receiver 38, the separated water receiver 38 is adjusted. Thus, air is mixed into the secondary sewage discharged to the septic tank 50 through the third sludge pipe 46 and the fourth sludge pipe 47 so that pressure fluctuation such as pulsation does not occur. Also by this, the secondary sewage discharged | emitted as the tension water of the septic tank 50 can be discharged | emitted smoothly.

  On the other hand, as described above, when the primary sewage is pumped with a pressure difference of about 0.2 MPa between the pressure in the reaction tank 7 and the pressure in the sludge tank 8 by the check valve 35, the primary in the reaction tank 7 When the amount of sewage is reduced and a water head difference h of about 2 m is generated between the liquid level in the reaction tank 7 and the portion supplying the primary sewage in the sludge tank 8 (the sludge water diffusion section 90), the reaction tank In some cases, the pressure difference between the inside of the tank 7 and the sludge tank 8 is canceled and the pressure difference disappears. In this case, the primary sewage pumped to the sludge tank 8 may flow back to the reaction tank 7 side and cause pressure fluctuations in the secondary sewage (separated water) discharged from the separated water receiver 38. However, by providing a check valve 85 in the second sludge pipe 44 that pumps the primary sewage from the reaction tank 7 to the sludge tank 8, the primary sewage is prevented from flowing back from the sludge tank 8 side to the reaction tank 7 side. . Also by this, the pressure fluctuation of the secondary sewage (separated water) discharged from the separated water receiver 38 of the sludge tank 8 is suppressed, and the pressure fluctuation such as pulsation is caused by air mixed in the tension water discharged to the septic tank 50. Smooth secondary discharge of sewage that prevents the occurrence of water.

  In this way, even if the amount of primary sewage in the reaction tank 7 decreases, the secondary sewage discharged to the septic tank 50 is prevented from causing pressure fluctuations such as pulsation, and is used as the sewage water in the septic tank 50 as secondary water. The sewage is discharged smoothly.

  The above is the details of the work contents shown in FIG. 17 to 20 show the work of sucking raw sludge water from the auxiliary suction valve 98 provided in the sludge concentrator 120 shown in FIGS. 10 to 12 by the short hose 111. Similarly to the sludge concentrating device 20 shown in FIG. 2, it is possible to perform the operation of sucking the raw sludge water by the sludge suction pipe 51 of the hose reel 9. Whether the work is performed with the short hose 111 or the sludge suction pipe 51 may be appropriately determined according to the work situation or the like.

  In the above embodiment, the example of sucking and concentrating the raw sludge water in the septic tank 50 has been described. However, for example, if the raw sludge water having a low solid content is used, the raw sludge water is sucked in FIGS. The tank switching valve 45 may be switched to the reaction tank position f to suck the raw sludge water directly into the reaction tank 7, and each operation such as sludge suction is not limited to the above-described operations.

  Moreover, it is possible to combine suitably the structure in the sludge concentration apparatus 20 of the said 1st Embodiment, and the structure in the sludge concentration apparatus 120 of 2nd Embodiment, and each structure is suitably set according to use conditions etc. What is necessary is just to combine.

  Further, the first and second embodiments show examples, and various modifications can be made without departing from the gist of the present invention, and the present invention is not limited to the above-described embodiments. .

  The sludge suction device according to the present invention can be used for collecting sludge for smoothly discharging separated water obtained by separating sludge from septic tank sludge, industrial waste sludge, and the like.

It is a side view which shows the sludge concentration vehicle which concerns on 1st Embodiment of this invention. It is a top view of the sludge concentration vehicle shown in FIG. It is a piping system diagram of the sludge concentration apparatus mounted in the sludge concentration vehicle shown in FIGS. It is a work content figure in the structure of the piping system diagram shown in FIG. It is a piping system diagram at the time of the raw sludge water suction in the work content diagram shown in FIG. It is a piping system figure at the time of the aggregation reaction in the reaction tank in the work content diagram shown in FIG. FIG. 5 is a piping system diagram when the atmosphere is released in the work content diagram shown in FIG. 4. It is a piping system diagram at the time of sludge concentration in the work content diagram shown in FIG. It is a piping system figure at the time of discharge | emission from the discharge valve in the work content diagram shown in FIG. It is a side view which shows the sludge concentration vehicle which concerns on 2nd Embodiment of this invention. It is a top view of the sludge concentration vehicle shown in FIG. It is a rear view of the sludge concentration vehicle shown in FIG. It is the partial sectional view which looked at the state where the drum screen provided in the sludge concentration car of Drawing 10 was removed from the vehicles back. It is a XIV-XIV arrow line view of the drum screen shown in FIG. It is a piping system diagram of the sludge concentration apparatus mounted in the sludge concentration vehicle shown in FIGS. It is a work content figure in the structure of the piping system diagram shown in FIG. FIG. 17 is a piping system diagram when sucking raw sludge water in the work content diagram shown in FIG. 16. It is a piping system figure at the time of the aggregation reaction in the reaction tank in the work content diagram shown in FIG. FIG. 17 is a piping system diagram when the atmosphere is released in the work content diagram shown in FIG. 16. It is a piping system diagram at the time of sludge concentration in the work content diagram shown in FIG.

Explanation of symbols

1 ... Sludge concentration vehicle
5 ... Tank
6 ... Bulkhead
7 ... Reaction tank
8 ... Sludge tank
9 ... Hose reel
11 ... Drum screen (sludge separation means)
20 ... Sludge concentrator
22 ... Pump
25 ... Suction / pressurization switching valve
31 ... First air pipe
32 ... Second air pipe
33 ... Third air pipe
34 ... Fourth air pipe
35 ... Check valve
36 ... Pressure reducing valve (pressure reducing means)
38 ... Separate water receiver
43 ... 1st sludge pipe
44. Second sludge pipe
45 ... Tank switching valve
46 ... Third sludge pipe
47 ... 4th sludge pipe
49 ... Pressurizing valve
50 ... Septic tank
51 ... Sludge suction pipe
52. Sludge discharge pipe
60 ... Screen body
80 ... Air shut-off valve
82 ... Liquid level switch
83 ... Open / close valve
85 ... Check valve
97 ... Auxiliary suction tube
98 ... Auxiliary suction valve 110 ... Hose support member 111 ... Short hose (sludge suction pipe)
114 ... fifth air pipe 115 ... intake pipe 116 ... intake valve 120 ... sludge concentrator 121 ... sludge concentrator

Claims (8)

A tank in which a sludge tank and a reaction tank are separated by a partition;
A pump for depressurizing or pressurizing the tank;
A suction / pressurization switching valve for communicating or blocking between the pump and the tank;
A sludge suction pipe for sucking raw sludge water into the sludge tank and the sludge tank or the reaction tank communicate with each other, or a tank switching valve for communicating the sludge tank and the reaction tank,
A sludge concentrating device, characterized in that a depressurization means for lowering the sludge tank pressurization pressure of the tank to be lower than the reaction tank pressurization pressure is provided in a path for communicating the suction / pressurization switching valve and the inside of the tank.   The sludge concentration apparatus according to claim 1, wherein the pressure reducing means is provided with a function of reducing the pressure of the sludge tank to a pressure lower than the pressure of the reaction tank and higher than the atmospheric pressure.   The sludge concentration according to claim 1 or 2, wherein the pressure reducing means comprises a pressure reducing valve, and a pressure difference of approximately 0.2 MPa is provided between the pressure in the sludge tank and the pressure in the reaction tank. apparatus.   A sludge separation means is provided in the sludge tank, a separation water receiver is provided in the sludge separation means for storing separated water separated from the sludge, a water amount detection means is provided in the separation water receiver, and a water amount decrease signal of the water amount detection means is provided. The sludge concentration apparatus according to claim 3, further comprising a control mechanism for increasing a pressure difference between the reaction tank pressurization pressure and the sludge tank pressurization pressure.   5. The control mechanism according to claim 4, wherein the control mechanism is configured by an on-off valve that shuts off a path that connects the suction / pressurization switching valve and the sludge tank when the water amount detection means detects a water amount decrease signal of the separated water receiver. Sludge concentrator.   The sludge according to claim 5, wherein a liquid level detector for detecting a liquid level of the separated water receiver is provided in the water amount detecting means, and a control device for opening and closing the on-off valve based on a signal of the liquid level detector is provided. Concentrator.   The sludge concentration apparatus of any one of Claims 1-6 which provided the check valve which prevents the backflow from a sludge tank to a reaction tank in the path | route which sends sewage from the said reaction tank to a sludge tank.   The sludge concentration vehicle provided with the sludge concentration apparatus of any one of Claims 1-7.

Images