JP2008264620A - Sand removing apparatus and sand removing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sand removing apparatus by which amount of liquid components contained in a discharge is little. <P>SOLUTION: The sand removing apparatus is equipped with a liquid cyclone 19 which performs centrifugal classification of an treatment object 51 containing sand and organic matter to separate the treatment object 51 to a sand-removed liquid 52 with little turbidity material and a concentrate treated liquid 53 with much turbidity material, a draining tank 24 which performs precipitation classification of the concentrate treated liquid 53, a pipe conveyor 25 which takes out sand-containing precipitate obtained by the precipitation classification as the discharge 54 and a liquid suction device 26 which sucks the liquid components contained in the taken-out discharge 54. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a sand removing device and a sand removing method, and more particularly, to an apparatus and a method suitable for removing sand contained in human waste or purified layer sludge.

  Treatment of human waste and septic tank sludge (hereinafter referred to as “human waste treatment” in the sense of including both of these) performed at a treatment facility or sludge regeneration treatment center is divided into two processes, a pre-process and a post-process. In the previous process, impurities and sand contained in human waste and septic tank sludge are removed. In the post-process, human waste and septic tank sludge are processed by processes such as biological treatment and chemical treatment.

  Improvement of the sand removal rate in the pre-process is important for protecting the equipment in the post-process. If sand is mixed into the object to be processed in the subsequent process, it may cause deterioration of the pump or other equipment provided in the subsequent process, blockage of the piping and internal wear, and accumulation of sand in the storage tank or biological treatment water tank.

  Japanese Patent Laid-Open No. 2006-263702 discloses a technique for improving the sand removal rate in the previous process. The sand removing device described in this publication is generally composed of a hydrocyclone, a draining tank, and a pipe conveyor. The object to be treated is separated into a clarified treatment liquid with less turbidity and a concentrated treatment liquid with much turbidity by a liquid cyclone, and then sedimentation classification is performed in a draining tank for the concentrated treatment liquid with much turbidity. . The precipitate obtained by sedimentation classification is mainly composed of sand. The obtained precipitate is conveyed as a discharge by a pipe conveyor. The pipe conveyor itself has a function of removing liquid components during transportation. According to such a configuration, the pipe conveyor that transports the discharged product has a function of removing the liquid component, and the processing object can be processed in a sealed environment. Therefore, it is possible to realize a sand removing device that generates less sand and has a high sand removal rate.

One problem with the sand removal device described in this publication is incomplete separation of the liquid components by the pipe conveyor. When sand and liquid are mixed, the sand and a certain amount of liquid stay together without being separated under atmospheric pressure. Thus, the discharge (mostly sand) conveyed by the pipe conveyor still contains a non-negligible amount of liquid components. If the discharge contains many liquid components, the liquid components will ooze out from the discharge during transport and storage, which is a problem in terms of hygiene and facility maintenance.
JP 2006-263702 A

  Accordingly, an object of the present invention is to provide a sand removal device in which the amount of liquid components contained in the discharge is small.

  In order to achieve the above object, the present invention employs the means described below. In the description of the means, in order to clarify the correspondence between the description of [Claims] and the description of [Best Mode for Carrying Out the Invention], [Best Mode for Carrying Out the Invention] ] Are used for reference. However, the appended numbers and symbols should not be used to limit the technical scope of the invention described in [Claims].

  In one aspect, the sand removing device of the present invention removes the sand from the processing object (51) by performing centrifugal classification on the processing object (51) including sand and organic matter. A centrifugal classifier (19) that separates the sand removal liquid (52) and the concentrated processing liquid (53) containing sand; and a precipitation classification mechanism (24) that performs precipitation classification on the concentrated processing liquid (53). , A discharge pick-up mechanism (25) for picking up the sand-containing precipitate obtained by the precipitation classification as discharge (54), and sucking the liquid component contained in the picked-up discharge (54) And a liquid suction device (26).

  It is preferable that the said discharge | emission taking-out mechanism (25) is a pipe conveyor. More specifically, the discharge pick-up mechanism (25) includes a pipe (31) connected to the sediment classification mechanism (24) and a plurality of blades (32) disposed in the pipe (31). And a towing line (33) for connecting the plurality of blades (32), and a drive unit (34) for driving the towing line (33).

  The liquid suction device (26) is preferably a vacuum suction device including a filter (41) attached to the pipe (31) and a pump (44) for applying a negative pressure to the filter (41). . In this case, the aperture of the filter (41) is preferably 30 μm to 100 μm.

  A liquid cyclone is preferably used as the centrifugal classifier (19).

  Preferably, the sand removing device further includes a heat treatment device (27) for performing heat treatment on the discharged matter (54) from which the liquid component has been sucked.

  Instead of the liquid suction device (26), a squeezing device (28) for squeezing the precipitate (54) taken out by the discharge taking-out mechanism (25) to remove the liquid component may be used.

In another aspect, the sand removal method of the present invention includes:
By performing centrifugal classification on the processing object (51) containing sand and organic matter, the processing object (51) is concentrated to contain the sand removal liquid (52) from which the sand has been removed and the sand. Separating into liquid (53);
Performing precipitation classification on the concentrated treatment liquid (53);
Removing the precipitate containing the sand obtained by the precipitation classification as an effluent (54);
And a step of sucking a liquid component contained in the discharged matter (54) taken out.

In still another aspect, the sand removal method of the present invention comprises:
By performing centrifugal classification on the processing object (51) containing sand and organic matter, the processing object (51) is concentrated to contain the sand removal liquid (52) from which the sand has been removed and the sand. Separating into liquid (53);
Performing precipitation classification on the concentrated treatment liquid (53);
Removing the precipitate containing the sand obtained by the precipitation classification as an effluent (54);
Squeezing the removed precipitate (54) to remove the liquid component.

  ADVANTAGE OF THE INVENTION According to this invention, the sand removal apparatus with few quantity of the liquid component contained in discharge can be provided.

  FIG. 1 is a block diagram showing a configuration of a processing plant in one embodiment of the present invention. The processing plant 10 in FIG. 1 is a processing plant used for human waste processing and septic tank sludge processing, and has a configuration in which contaminants including sand are removed in the previous process and biological processing is performed in the subsequent process. ing. In the present embodiment, the processing plant 10 includes a receiving tank 11, a crushing pump 12, a drum screen 13, a screw press 14, a conveyor 15, a residue hopper 16, an incinerator 17, a relay tank 18, a cyclone 19, a storage tank 20, and an input. A pump 21, a biological treatment water tank 22, a rotary valve 23, a draining tank 24, a pipe conveyor 25, and a liquid suction device 26 are provided.

  The receiving tank 11 receives and accumulates human waste, septic tank sludge, or a mixture thereof as a processing object. The processing object accumulated in the receiving tank 11 is crushed by the crushing pump 12 and is pumped to the drum screen 13. The drum screen 13 removes impurities from the processing object that has been pumped. The contaminants removed by the drum screen 13 are sent to the screw press 14, while the processing object from which the contaminants are removed is sent to the relay tank 18.

  The screw press 14 mechanically squeezes the impurities removed by the drum screen 13. The liquid component taken out by pressing is sent to the receiving tank 11. On the other hand, the residue remaining in the squeezing is discharged to the conveyor 15 and is put into the residue hopper 16 by the conveyor 15. The residue hopper 16 introduces the added residue into the incinerator 17. The incinerator 17 incinerates the added residue.

  The relay tank 18 sends the processing object sent from the drum screen 13 to the hydrocyclone 19 using the relay pump 18a provided therein.

  The hydrocyclone 19, the draining tank 24, the pipe conveyor 25, and the liquid suction device 26 are sand removal devices having a function of removing sand from the processing target, and are one of the characteristic configurations of the present embodiment. Below, with reference to FIG. 2, the structure of the liquid cyclone 19, the draining tank 24, the pipe conveyor 25, and the liquid suction device 26 is demonstrated in detail.

  The hydrocyclone 19 is a device that performs centrifugal classification on the processing object 51 sent from the relay tank 18. More specifically, the hydrocyclone 19 applies centrifugal force to the processing object 51 by the swirling flow generated by the flow of the processing object 51 itself, and removes the processing object 51 from which the sand is removed. It isolate | separates into the sand liquid 52 and the concentrated process liquid 53 containing sand. As shown in FIG. 1, the sand removal liquid 52 not containing sand is sent to the storage tank 20 and temporarily accumulated, and further sent to the biological treatment water tank 22 by the input pump 21. Sand is contained in the concentrated treatment liquid 53 with a large amount of turbidity and not contained in the sand removal liquid 52, so that no sand is accumulated in the storage tank 20 and the biological treatment water tank 22. As described above, removing sand from the treatment liquid sent to the storage tank 20 and the biological treatment water tank 22 prevents accumulation of sand in the storage tank 20 and the biological treatment water tank 22, and further to the biological treatment water tank 22. This is important in order to reduce wear and deterioration of a connected post-process device (for example, a pump). On the other hand, as shown in FIG. 2, the concentrated treatment liquid 53 with a large amount of turbidity is sent to the draining tank 24 via the rotary valve 23.

  The draining tank 24 accumulates the concentrated treatment liquid 53 sent from the liquid cyclone 19 and performs sedimentation classification. More specifically, an overflow liquid receiver 24 a is provided inside the draining tank 24, and an opening connected to the pipe 31 of the pipe conveyor 25 is provided below the draining tank 24. Since the draining tank 24 and the pipe 31 of the pipe conveyor 25 are connected, the liquid surface of the concentrated treatment liquid 53 exists inside the draining tank 24 and also exists inside the pipe 31 of the pipe conveyor 25. . In FIG. 2, the liquid level of the concentrated processing liquid 53 inside the draining tank 24 is indicated by reference numeral 53 a, and the liquid level of the concentrated processing liquid 53 inside the pipe 31 of the pipe conveyor 25 is indicated by reference numeral 53 b. The sediment precipitated by the sedimentation classification is introduced into the pipe conveyor 25 through an opening provided in the lower part of the draining tank 24. Most of this sediment is sand. On the other hand, when the liquid surface 53a of the concentrated treatment liquid 53 exceeds the upper end of the overflow liquid receiver 24a, the liquid component flows into the overflow liquid receiver 24a and is sent to the receiving tank 11. The liquid component flowing into the overflow liquid receiver 24a does not include a precipitate.

  The pipe conveyor 25 takes out the sediment generated by the sedimentation classification as a discharge, conveys it, and drops it on the conveyor 15. The pipe conveyor 25 includes a plurality of blades 32 provided inside the pipe 31, a tow rope 33 that connects the blades 32 in a ring shape, and a drive device 34 that drives the tow rope 33. As the tow rope 33, a chain is used in the present embodiment. The tow rope 33 is driven so that the blade 32 moves in an annular shape inside the pipe 31. Specifically, the tow rope 33 is driven so that the blade 32 rises in the rising portion 31a of the pipe 31 and the blade 32 descends in the falling portion 31b. The discharge introduced from the draining tank 24 to the pipe conveyor 25 is captured by the blade 32 and moves up the rising portion 31 a of the pipe 31. In FIG. 2, the effluent trapped by the blade 32 is indicated by reference numeral 54. The discharged material 54 is introduced into the discharge port 35 when it reaches the rising portion 31 a and is dropped onto the conveyor 15 from the discharge port 35. As shown in FIG. 1, the discharge 54 dropped on the conveyor 15 is conveyed to the residue hopper 16 by the conveyor 15.

  Returning to FIG. 2, the discharge 54 is transported beyond the liquid level 53 b of the concentrated treatment liquid 53, so that the liquid component is removed from the discharge 54 to some extent. That is, the pipe conveyor 25 also has a function of roughly removing the liquid component from the discharge 54. However, the effluent 54 still contains a non-negligible amount of liquid components. Most of the discharged matter 54 taken out by the pipe conveyor 25 is sand. However, when the sand and the liquid are mixed, the sand and the liquid of a certain amount are not separated from each other and remain integrally under atmospheric pressure. If the discharge 54 contains a large amount of liquid components, the liquid components leached out while being conveyed by the conveyor 15 will sag or the liquid components will accumulate in the residue hopper 16, so that in terms of hygiene and equipment operation It is a problem.

  In this embodiment, in order to remove more liquid components from the discharge 54 conveyed by the pipe conveyor 25, the liquid suction device 26 that sucks the liquid component from the discharge 54 is used. In this embodiment, as the liquid suction device 26, a vacuum suction device including a filter 41, a suction chamber 42, a vacuum tank 43, a vacuum pump 44, and a drainage pump 45 is used. The suction chamber 42 is joined to an opening provided in the rising portion 31 a of the pipe 31. The filter 41 is provided at the joint between the pipe 31 and the suction chamber 42 so as to partition the pipe 31 and the suction chamber 42. The suction chamber 42 is connected to the vacuum tank 43 through a pipe. A vacuum pump 44 and a drainage pump 45 are connected to the vacuum tank 43, and a liquid level meter 46 for measuring the liquid level in the vacuum tank 43 is further provided. The vacuum pump 44 has a function of discharging air from the vacuum tank 43 to the atmosphere. The air in the vacuum tank 43 may be directly discharged to the atmosphere, or may be released to the atmosphere after being deodorized by a deodorizing device. When the vacuum pump 44 is operated, the suction chamber 42 and the vacuum tank 43 are depressurized, and a negative pressure is applied to the filter 41. As a result, the liquid component is sucked from the discharge 54 in contact with the filter 41. As described above, in the present embodiment, by sucking the liquid component by the liquid suction device 26, the content rate of the liquid component in the discharge 54 is reduced.

  The liquid component sucked from the discharge 54 is temporarily accumulated in the vacuum tank 43. The liquid component is discharged from the vacuum tank 43 by a drain pump 45. When the liquid level gauge 46 detects that the liquid level in the vacuum tank 43 has reached the predetermined liquid level, the vacuum pump 44 is stopped and the drainage pump 45 is operated, whereby the liquid components accumulated in the vacuum tank 43 are Is sent to the receiving tank 11.

  In the inventor's experiment, when the discharge 54 is conveyed by the pipe conveyor 25, the liquid component content of the discharge 54 becomes 55 to 60%, and further, the liquid is obtained by using the filter 41 having an opening of 75 μm. By sucking the liquid component with the suction device 26, the content of the liquid component was reduced to about 36%.

  It should be noted that it is difficult to remove the liquid component directly from the concentrated treatment liquid 53 sent from the liquid cyclone 19 by the liquid suction device 26. This is because the concentrated treatment liquid 53 contains a large amount of fine suspended matters such as human waste sludge. If a large amount of fine suspended matter is mixed in the object to be processed, the filter is likely to be clogged. Therefore, it is practically difficult to perform the process of sucking the liquid component from the object to be processed by the liquid suction device. . According to the configuration of the present embodiment, since the discharged matter 54 is conveyed by the pipe conveyor 25, fine suspended matters are almost removed together with the liquid component from the discharged matter 54, so that the liquid component is sucked from the discharged matter 54. Can be processed.

  The size of the opening of the filter 41 is important because it affects the content ratio of the liquid component of the discharge 54 after sucking the liquid component and the ease of clogging of the filter 41. According to the inventor's study, the size of the openings of the filter 41 is preferably 30 μm to 100 μm. As shown in FIG. 3, the particle size distribution of sand precipitated by sedimentation classification begins to increase at about 30 μm with increasing particle size and reaches a peak at about 100 μm. Therefore, if the size of the opening of the filter 41 is 30 μm to 100 μm, the sand contained in the discharge 54 is generally prevented from entering the vacuum tank 43. On the other hand, if the size of the opening of the filter 41 is 30 μm to 100 μm, clogging due to fine suspended substances is unlikely to occur. From such a viewpoint, the size of the openings of the filter 41 is preferably 30 μm to 100 μm.

  In the present embodiment, the liquid suction device 26 is joined to the pipe 31 of the pipe conveyor 25, but the liquid suction device may be connected to the discharge port 35 of the pipe conveyor 25. What is important is that the liquid component is sucked into the discharged material 54 conveyed beyond the liquid level 53b of the concentrated processing liquid 53.

  FIG. 4 is a diagram illustrating an example of a configuration of a liquid suction device (referred to by reference numeral 26 </ b> A in FIG. 4) provided connected to the discharge port 35 of the pipe conveyor 25. In the liquid suction device 26 </ b> A of FIG. 4, a vacuum tank 43 </ b> A that is also used as a suction chamber is connected to the discharge port 35 of the pipe conveyor 25. The vacuum tank 43A is provided with a filter 41 at an angle. The filter 41 is provided such that its lowest position is the position of the discharge port 47. A vacuum pump 44 and a drainage pump 45 are connected to the vacuum tank 43A, and a liquid level meter 46 for measuring the liquid level in the vacuum tank 43 is further provided.

  The liquid suction device 26A in FIG. 4 operates as follows. The discharged material 54 is dropped onto the filter 41 from the discharge port 35 of the pipe conveyor 25 and is deposited on the filter 41. When the air in the vacuum tank 43A is discharged by the vacuum pump 44, the vacuum tank 43A is depressurized and a negative pressure is applied to the filter 41. As a result, the liquid component is sucked from the discharge 54 in contact with the filter 41. Since the filter 41 is provided obliquely, when the discharge 54 is successively dropped onto the filter 41, the discharge 54 flows into the discharge port 47 of the vacuum tank 43A due to its own weight, and the conveyor 15 Dropped. The liquid component sucked from the discharge 54 is temporarily accumulated in the vacuum tank 43A. The liquid component is discharged from the vacuum tank 43 </ b> A by the drain pump 45. When the liquid level gauge 46 detects that the liquid level in the vacuum tank 43 has reached the predetermined liquid level, the vacuum pump 44 is stopped and the drainage pump 45 is operated, whereby the liquid components accumulated in the vacuum tank 43A are operated. Is sent to the receiving tank 11.

  As shown in FIG. 5, a piston 48 and a cylinder 49 may be used to forcibly discharge the discharge 54 accumulated on the filter 41 from the discharge port 47. The cylinder 49 is driven at an appropriate timing to push out the piston 48. When the piston 48 is pushed out, the discharge 54 accumulated on the filter 41 is forcibly discharged from the discharge port 47. The cylinder 49 may be driven by air pressure or hydraulic pressure, or may be driven by an electric actuator.

  FIG. 6 is a view showing another example of the configuration of the liquid suction device (referred to by reference numeral 26B in FIG. 6) provided connected to the discharge port 35 of the pipe conveyor 25. In the liquid suction device 26B of FIG. 6, a belt-type filter constituting an endless track is used. More specifically, in the liquid suction device 26 </ b> B of FIG. 6, a suction chamber 42 is connected to the discharge port 35 of the pipe conveyor 25, and in the suction chamber 42, a filter 41 </ b> A constituting an endless track is a roller 61. , 62. The filter 41A is located directly below the discharge port 35. The roller 62 is connected to the driving device 65 by a chain 64 and is driven by the driving device 65. The suction cup 63 is arranged so as to be located immediately below the upper part of the filter 41A (the part facing the discharge port 35). The suction cup 63 is connected to the vacuum tank 43. A vacuum pump 44 and a drainage pump 45 are connected to the vacuum tank 43, and a liquid level meter 46 for measuring the liquid level in the vacuum tank 43 is further provided. The vacuum pump 44 has a function of discharging air from the vacuum tank 43 to the atmosphere.

  The liquid suction device 26B of FIG. 6 operates as follows. The discharged material 54 is dropped onto the filter 41A from the discharge port 35 of the pipe conveyor 25 and is deposited on the filter 41A. When the air in the vacuum tank 43 is discharged by the vacuum pump 44, the vacuum tank 43 and the suction cup 63 are decompressed, and a negative pressure is applied to the filter 41A. Thereby, the liquid component is sucked from the discharge 54 in contact with the filter 41A.

  While the liquid component is sucked from the discharge 54 dropped on the filter 41A, the filter 41A is driven by the roller 62, the chain 64, and the driving device 65. The upper part of the filter 41 </ b> A is sequentially moved toward the discharge port 47, whereby the discharge 54 from which the liquid component has been sucked is discharged to the discharge port 47 and dropped onto the conveyor 15.

  Similarly to the liquid suction device 26 </ b> A of FIGS. 4 and 5, the liquid component sucked from the discharge 54 is temporarily accumulated in the vacuum tank 43. The liquid component is discharged from the vacuum tank 43 by a drain pump 45. When the liquid level gauge 46 detects that the liquid level in the vacuum tank 43 has reached the predetermined liquid level, the vacuum pump 44 is stopped and the drainage pump 45 is operated, whereby the liquid components accumulated in the vacuum tank 43 are Is sent to the receiving tank 11.

  FIG. 7 is a diagram showing still another example of the configuration of the liquid suction device (referred to by reference numeral 26C in FIG. 7) provided connected to the discharge port 35 of the pipe conveyor 25. The liquid suction device 26C of FIG. 7 uses a cylindrical filter 41B to which a blade 66 is attached. The filter 41B is attached so as to be rotatable. The slats 66 are radially attached so as to protrude outward from the filter 41 </ b> B, and are used to receive the discharge 54 dropped from the discharge port 35 of the pipe conveyor 25. The filter 41B is connected to the driving device 68 by a chain 67. The discharge port 47 of the suction chamber 42 is provided obliquely below the filter 41 </ b> B. When the filter 41 </ b> B rotates, the discharge 54 deposited thereon is dropped into the discharge port 47. A suction cylinder 69 is disposed inside the cylindrical filter 41B. The upper part of the suction cylinder 69 is a mesh 69a. The mesh 69a is provided so as to face the filter 41B, and is used for sucking a liquid component from the discharge 54, as will be described later.

  The liquid suction device 26C in FIG. 7 operates as follows. The discharged material 54 is dropped from the discharge port 35 of the pipe conveyor 25 onto the filter 41B. Since the slat 66 is provided in the filter 41B, the discharged discharge 54 accumulates on the filter 41B. When the air in the vacuum tank 43 is discharged by the vacuum pump 44, the vacuum tank 43 and the suction cylinder 69 are depressurized and a negative pressure is applied to the filter 41B. As a result, the liquid component is sucked from the discharge 54 in contact with the filter 41B.

  While the liquid component is sucked from the discharge 54 dropped on the filter 41B, the filter 41B is driven by the chain 67 and the driving device 68. When the filter 41B is driven and rotated, the discharge 54 deposited on the filter 41B is dropped into the discharge port 47 provided obliquely below the filter 41B. As a result, the discharge 54 from which the liquid component has been sucked is discharged to the discharge port 47 and further dropped onto the conveyor 15.

  In the liquid suction device of FIGS. 2 and 4 to 7, the liquid component is discharged from the vacuum tank by the drainage pump, but the liquid component is discharged from the vacuum tank by natural flow using gravity. It is also possible. FIG. 8A is a diagram illustrating an example of a configuration of a liquid suction device that discharges a liquid component from a vacuum tank by natural flow. In the liquid suction device 26D of FIG. 8A, the liquid suction device 26A of FIG. 4 is changed so as to discharge the liquid component by natural flow.

  More specifically, in the liquid suction device 26D of FIG. 8A, a drainage automatic valve 71 is connected to the vacuum tank 43A instead of the drainage pump 45. When a liquid component is sucked from the discharge 54, the vacuum pump 44 is operated and the automatic drain valve 71 is closed. When the liquid level measured by the liquid level gauge 46 reaches a predetermined liquid level, the vacuum pump 44 is stopped and the automatic drain valve 71 is opened. When the vacuum pump 44 is stopped, air is taken into the vacuum tank 43A through the filter 41, whereby the vacuum tank 43A returns to atmospheric pressure. When the automatic drain valve 71 is opened in this state, the liquid component accumulated in the vacuum tank 43A naturally flows down due to gravity. According to such a configuration, by providing the receiving tank 11 at a position lower than the vacuum tank 43A, the liquid components accumulated in the vacuum tank 43A can be sent to the receiving tank 11 without using a pump. .

  As shown in FIG. 8B, a vacuum break valve 72 may be further attached to the vacuum tank 43A. The vacuum breaker valve 72 is used to introduce air into the vacuum tank 43A when discharging the liquid component. More specifically, when a liquid component is sucked from the discharge 54, the vacuum pump 44 is operated, and the automatic drain valve 71 and the vacuum breaker valve 72 are closed. When the liquid level measured by the liquid level gauge 46 reaches a predetermined liquid level, the vacuum pump 44 is stopped and the automatic drain valve 71 and the vacuum breaker valve 72 are opened. When the vacuum pump 44 is stopped, air is taken into the vacuum tank 43A via the vacuum breaker valve 72, whereby the vacuum tank 43A returns to atmospheric pressure. When the automatic drain valve 71 is opened in this state, the liquid component accumulated in the vacuum tank 43A naturally flows down due to gravity. According to such a configuration, by providing the receiving tank 11 at a position lower than the vacuum tank 43A, the liquid components accumulated in the vacuum tank 43A can be sent to the receiving tank 11 without using a pump. .

  It should be noted that the configuration in which the liquid component is discharged by the natural flow of FIGS. 8A and 8B is also applicable to the liquid suction device of FIGS. 2 and 5 to 7.

  In the present embodiment, the centrifugal classification of the processing object 51 sent from the relay tank 18 is performed by the liquid cyclone 19, but a centrifuge may be used instead of the liquid cyclone 19. However, from the viewpoint of simple structure and high throughput, the hydrocyclone 19 is most suitable as a means for performing centrifugal classification.

  Further, in the processing system of FIG. 1, the discharge 54 discharged from the pipe conveyor 25 is put into the incinerator 17 via the conveyor 15 and the residue hopper 16, but the discharge 54 is discharged by the incinerator 17. There is no need to be incinerated. The discharge 54 is subjected to a process of sucking the liquid component, and the organic matter is removed together with the liquid component. Therefore, the organic matter contained in the discharge 54 is small. For this reason, there is no problem in terms of hygiene even if the discharged matter 54 is processed by landfill disposal as it is.

  However, in order to perform a more hygienic process, as shown in FIG. 9, the landfill disposal of the discharge 54 discharged from the pipe conveyor 25 is performed after the heat treatment by the heat treatment device 27. It is preferable. The heat treatment temperature is preferably 100 ° C. or higher, and most preferably about 400 ° C. As a heat source of the heat treatment apparatus 27, it is preferable to use waste heat of the incinerator 17. By introducing the exhaust gas from the incinerator 17 into the heat treatment apparatus 27, the heat treatment by the heat treatment apparatus 27 can be performed by effectively using the waste heat of the incinerator 17.

  Further, as shown in FIG. 10, a squeezing device 28 may be used instead of the liquid suction device 26. The pressing device 28 removes the liquid component from the discharge 54 by mechanically pressing the discharge 54 discharged from the pipe conveyor 25. As the pressing device 28, a belt pressing device, a filter press device, or a screw press device can be used. According to the inventor's experiment, by using the squeezing device 28, the liquid component content can be reduced to about 36%.

  The liquid component extracted by pressing by the pressing device 28 is sent to the receiving tank 11. On the other hand, the discharged material 54 from which the liquid component has been removed is dropped onto the conveyor 15, conveyed to the residue hopper 16, and further incinerated by the incinerator 17. Instead, the effluent 54 from which the liquid component has been removed may be processed by landfill as it is, and, similarly to the configuration of FIG. You may process by a landfill disposal after heat processing is performed.

FIG. 1 is a block diagram showing a configuration of a processing plant in one embodiment of the present invention. FIG. 2 is a conceptual diagram showing the configuration of the sand removing device in one embodiment of the present invention. FIG. 3 is a graph showing an example of the particle size distribution of sand precipitated by precipitation classification. FIG. 4 is a conceptual diagram showing a configuration of a sand removing device according to another embodiment of the present invention. FIG. 5 is a conceptual diagram showing a modification of the sand removing device of FIG. FIG. 6 is a conceptual diagram showing a configuration of a sand removing device in still another embodiment of the present invention. FIG. 7 is a conceptual diagram showing a configuration of a sand removing device in still another embodiment of the present invention. FIG. 8A is a conceptual diagram showing a configuration of a mechanism for discharging a liquid component from a vacuum tank of the liquid suction device. FIG. 8B is a conceptual diagram showing a configuration of a mechanism for discharging a liquid component from a vacuum tank of the liquid suction device. FIG. 9 is a block diagram showing a configuration of a processing plant in still another embodiment of the present invention. FIG. 10 is a block diagram showing a configuration of a processing plant in still another embodiment of the present invention.

Explanation of symbols

10: treatment plant 11: receiving tank 12: crushing pump 13: drum screen 14: screw press 15: conveyor 16: slag hopper 17: incinerator 18: relay tank 18a: relay pump 19: cyclone 20: storage tank 21: input Pump 22: Biological treatment water tank 23: Rotary valve 24: Drain tank 24a: Overflow liquid receiver 25: Pipe conveyor 26, 26A, 26B, 26C, 26D: Liquid suction device 27: Heat treatment device 28: Squeezing device 31: Pipe 31a: Ascent Part 31b: Lowering part 32: Blade 33: Tow rope 34: Drive device 35: Discharge port 41, 41A, 41B: Filter 42: Suction chamber 43, 43A: Vacuum tank 44: Vacuum pump 45: Drain pump 46: Liquid level gauge 47: Discharge port 48: Piston 49: Cylinder 51: Processing object 52: Sand removal liquid 53: Concentrated processing liquid 53a, 53b: Liquid surface 54: Discharge 61, 62: Roller 63: Suction cup 64: Chain 65: Drive device 66: Blades 67: Chain 68: Drive device 69: Suction cylinder 69a: Mesh 71: Automatic drain valve 72: Vacuum break valve

Claims (11)

A centrifugal classifier for separating the processing object into a sand removal liquid from which the sand has been removed and a concentrated processing liquid containing the sand by performing centrifugal classification on the processing object including sand and organic matter; ,
A precipitation classification mechanism for performing precipitation classification on the concentrated treatment liquid;
A discharge taking-out mechanism for taking out the precipitate containing the sand obtained by the precipitation classification as discharge;
A sand removing device, comprising: a liquid suction device that sucks a liquid component contained in the discharged discharge. The sand removal device according to claim 1,
The discharged matter taking-out mechanism is
A pipe connected to the precipitation classification mechanism;
A plurality of blades disposed in the pipe;
A towline connecting the plurality of blades;
A sand removing device comprising: a driving device that drives the tow rope. The sand removing device according to claim 2,
The liquid suction device is
A filter attached to the pipe;
A sand removal device comprising: a pump for applying a negative pressure to the filter. The sand removing device according to claim 3,
The opening of the filter is 30 μm to 100 μm. The sand removing device according to any one of claims 1 to 4,
The sand removal device, wherein the centrifugal classifier is a hydrocyclone. The sand removing device according to any one of claims 1 to 5,
Furthermore,
A sand removing device comprising a heat treatment device for performing heat treatment on the discharged matter from which the liquid component has been sucked. A centrifugal classifier for separating the processing object into a sand removal liquid from which the sand has been removed and a concentrated processing liquid containing the sand by performing centrifugal classification on the processing object including sand and organic matter; ,
A precipitation classification mechanism for performing precipitation classification on the concentrated treatment liquid;
A discharge taking-out mechanism for taking out the precipitate containing the sand obtained by the precipitation classification as discharge;
A sand removing device comprising: a pressing device for pressing the taken-out precipitate to remove a liquid component. Separating the processing object into a sand removal liquid from which the sand has been removed and a concentrated processing liquid containing the sand by performing centrifugal classification on the processing object including sand and organic matter;
Performing precipitation classification on the concentrated treatment liquid;
A step of taking out the precipitate containing the sand obtained by the precipitation classification as an effluent;
And a step of sucking a liquid component contained in the discharged waste. The sand removal method according to claim 8,
The step of taking out the effluent includes a pipe that receives the concentrated processing liquid, a plurality of blades disposed in the pipe, a towing line that connects the plurality of blades, and a drive device that drives the towing line. A sand removal method carried out by an exhaust discharge mechanism comprising: The sand removal method according to claim 8 or 9,
The step of sucking the liquid component is performed by bringing the precipitate into contact with a filter and applying a negative pressure to the filter. Separating the processing object into a sand removal liquid from which the sand has been removed and a concentrated processing liquid containing the sand by performing centrifugal classification on the processing object including sand and organic matter;
Performing precipitation classification on the concentrated treatment liquid;
A step of taking out the precipitate containing the sand obtained by the precipitation classification as an effluent;
And a step of removing the liquid component by squeezing the taken-out precipitate.

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