JP2006000831A - System for treating mud water and mud, and apparatus therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow mud water and mud generated in construction work or the like to be treated regardless of the quantity of water, a mud part to be used as soil for back-filling in a site and general land-filling without making an industrial waste, separate water to be used for make-up water of a drilling liquid, or discharged to a river or sewerage, and further, the whole apparatus to be mounted on a vehicle. <P>SOLUTION: In the treatment of the mud water and the mud generated in the construction work, the mud water and the mud are transported to a primary solid-liquid separator to carry out primary solid-liquid separation, a primarily separated liquid is transported to a secondary solid-liquid separator to carry out secondary solid-liquid separation, and further in a secondarily separated liquid, non-separated solid content is flocculated and precipitated by a flocculant as tertiary solid-liquid separation. A supernatant liquid is reused for dilution water or the drilling liquid, or discharged to the sewerage or the river as treated water. On the other hand, a secondarily separated solid content is reintroduced into the primary solid-liquid separation, and a tertiarily separated solid content is reused as modified soil such as the soil for back-filling and general land-filling by loading a solidification agent, and mixing to agitate together with the primarily solid-liquid separated solid content. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention performs mud treatment and mud solidification to separate mud and mud generated in construction foundation work, tunnel shield work, pipe burial promotion work, etc., and reusable transparent supernatant and improvement. The present invention relates to a system and an apparatus for making soil.

  Conventional methods for recovering generated mud mud, separating and reusing the sediment and moisture, and dewatering the generated mud with a vibrating screen, filter press, centrifuge, etc. The supernatant liquid is discharged, and the dewatered mud is disposed of as landfill in the final disposal site as industrial waste. Moreover, although it is a part, the method of putting a solidification material into the dehydrated mud and making improved soil is put into practical use.

  Under such circumstances, the mud mud generated in construction work is classified into the required size by sand and gravel according to the resource using a vibration sieve etc., and the mud is concentrated by coagulation sedimentation, and then dewatered by a dehydrator. The dehydrated cake is reformed and solidified with a solidifying material, made into a cylindrical shape using an extrusion molding machine, and then granulated into a spherical shape with a granulator to make all the solid content a resource. A type system was proposed. (See Patent Document 1)

  However, this closed type system has a wide range of equipment, so it becomes large, and it is rare that it can be installed due to the limitation of the area used at the construction site, and there is a problem of transporting mud mud and associated costs. It was.

  On the other hand, as an on-vehicle mass mud treatment apparatus, a method has been proposed in which mud is pulverized by agitation with a flocculant by a multi-shaft stirrer and stirred and mixed with the flocculant while shearing and crushing. (See Patent Document 2)

However, in this method, there is a problem that the flocculant is not only flocculated in the original sludge but also adhered and adsorbed on unnecessary soil and sand, so that a large amount of the flocculant is required, which is uneconomical. In addition, when applied to mud and mud with a lot of water, flocculant plus solidification material is supplied without dehydration, and excess water is consumed in the digestion and absorption reaction of quick lime components in the solidification material. It was uneconomical because it required the input of solidifying material.
(See Patent Document 2)
JP 11-347593 A JP 2003-200194 A

  Therefore, mud mud generated in construction work can be treated regardless of the amount of moisture, and mud is not reclaimed as industrial waste and can be reused as on-site backfill or general landfill. The separation water is treated water that can be reused, and the entire apparatus can be mounted on the vehicle.

  As a means for solving the above-mentioned problems, the present invention takes in mud mud generated in construction work into a storage tank by suction or a pump, and firstly performs primary solid-liquid separation with a filter such as a vibrating screen to perform primary separation from the primary treatment liquid. Separated into solids, the primary treatment liquid is subjected to secondary solid-liquid separation with a liquid cyclone, and divided into secondary separation solids that are returned to the secondary treatment liquid and a filter such as a vibrating screen. The secondary treatment liquid contains a flocculant. Add and coagulate the sludge contained in the secondary treatment liquid, and discharge the supernatant liquid to the replenishing water of the drilling liquid or rivers and sewers. The coagulated and settled sludge is solidified as quick lime together with the primary separated solids. There is a system and an apparatus thereof characterized by mixing and stirring with a material to obtain a modified soil, and reusing the modified soil as a soil for backfilling or general landfill in the field.

  According to the present invention, the primary treatment liquid is made into the secondary treatment liquid by the liquid cyclone, and the flocculant is added to the secondary treatment liquid to coagulate and settle the contained sludge. Is economical. Further, the sludge content that has been coagulated and settled is mixed and stirred with a solidifying agent such as quick lime together with the primary treatment solid content to obtain a modified soil, so that a sludge dewatering device as in Patent Document 1 is not required.

  In addition, mud mud is economical because it can reduce the amount of solidifying agent such as quick lime added to the mud and agglomerated sludge because excess water is removed with a filter such as a vibrating screen regardless of the amount of moisture. At the same time, a wide range of muddy mud can be treated.

  In addition, since the apparatus based on the system of the present invention can be mounted on a truck or the like, it is economical because muddy mud can be treated at or near the construction site.

  The present invention will be described below with reference to embodiments shown in the drawings.

  1 to 4 show an embodiment of an apparatus used for carrying out the present invention, which is mounted on a truck, 1 is a muddy mud receiver tank, and a pressure reduction from a blower 2 is provided on the upper part thereof. A muddy mud intake port 5 is provided with the piping and the baffle plate 4 in between. The muddy mud intake port 5 is provided with a flexible equality hose 3 for sucking and transporting mud mud generated at the construction site. The muddy water mud receiver tank 1 is provided with a tilting mechanism, and the mud mud mud is introduced from the discharge port 6 to the vibrating screen 7 side by tilting. The vibration screen 7 is a mechanism that is swung by a vibration motor 8. The primary treatment liquid discharged from the lower part is supplied to the primary treatment liquid tank 10, and the primary separated solid content from the side discharge port 9 is mixed with mud and agglomerated sludge. It is configured to be charged into the tank 11. A primary processing liquid agitator 12 and a liquid feed pump 13 to a cyclone 14 are attached to the primary processing liquid tank 10. In the cyclone 14, the secondary processing liquid from the upper part returns to the secondary processing liquid tank 15 and the secondary separation solid content from the lower part returns to the vibrating screen 7 by the swirling flow action. The secondary treatment liquid tank 15 is provided with a pump 17 for feeding the liquid to the mixing and stirring tank with the flocculant, and a flocculant supply device 20 is attached to the flocculant and the secondary processing liquid from the mixing and stirring tank 18. The mixed stirring liquid overflows and flows into the thickener 21 having high solid-liquid separation performance. A baffle plate is provided at the upper part of the thickener 21 so that the influent and the supernatant liquid are not directly mixed, and the tertiary separated solid content, that is, the agglomerated sludge that has settled at the bottom is supplied to the mud / agglomerated sludge mixing tank 11 via the pump 22. On the other hand, the supernatant liquid from which the sludge has been settled and removed is overflowed into the adjacent treated water tank 16 and flows in. The treated water tank 16 is supplied to the receiver tank 1 and the secondary treatment liquid tank 15 as a replenishing water for the drilling liquid, or as a dilution water when the viscosity of the mud mud is high by the vibrating screen 7 or to the river or sewer. A pump 24 is provided. The mud / aggregated sludge mixing tank 11 is provided with a screw conveyor 25 for conveying and mixing, and solidified from a solidified material storage tank 26 through a solidified material conveying screw conveyor 27 from a middle part of the conveying / mixing screw conveyor 25. It is comprised so that material may be thrown in. Then, the modified soil 28 is discharged from the front end of the conveying and mixing screw conveyor, the backfilling material is stored in the vicinity of the site, and the general landfilling material is loaded and transported to a dump truck (not shown). Yes. The mud mud treatment apparatus is equipped with a control panel 32 that includes mechanisms for controlling blowers, pumps, agitators, screw conveyors, and the like.

  In the system of the present invention, as shown in FIG. 5, the mud mud 40 generated at the construction site is transported to the primary solid-liquid separator to perform the primary solid-liquid separation 41, and the primary separation liquid 42 is the secondary solid-liquid separation. The mixture is transported to a liquid separator for secondary solid-liquid separation 44. Further, the secondary separation liquid 45 is subjected to coagulation precipitation of unseparated solids with a coagulant 48 as tertiary solid-liquid separation 47, and the supernatant liquid is treated. The water 49 is reused as dilution water or drilling fluid, or discharged into sewers or rivers, while the secondary separated solid content 46 is re-introduced into the primary solid-liquid separation 41 and the tertiary separated solid content 50 is primary separated. This is a reuse system in which the solidifying material 51 is added and mixed and stirred together with the solid content 43 that is reformed 52 and used as the soil for backfilling or general landfilling as the modified soil 53.

  Next, the operation of the above embodiment will be described with reference to FIGS. 1 to 4 and FIG. FIG. 6 is a flowchart of FIG. In this description, as an example of the construction work, a pipe (not shown) in the pipe burying work is a process in which the buried pipe 30 is pushed in by the propulsion unit 29 while excavating the ground, and is generated in the shaft 31. The treatment of mud mud is described.

  First, the tip of the suction rubber rubber hose 3 for suction conveyance is inserted into the muddy mud portion of the shaft, and the muddy mud mud is conveyed and stored in the receiver tank 1 while the blower 2 is driven to depressurize the muddy mud receiver tank 1. At this time, in the receiver tank 1, the muddy mud intake port and the decompression line are separated by the baffle plate 4, so that the muddy mud mud can be prevented from entering the blower 2. Here, without using a blower, the muddy mud may be continuously sucked and conveyed by a squeeze pump or the like, and in this case, the receiver tank 1 can be omitted.

  Next, the drive of the blower is stopped once, the receiver tank 1 is returned to normal pressure, the vibration motor 8 of the vibration screen 7 is driven, the receiver tank is manually tilted, and the muddy mud mud from the discharge port 6 is vibrated. 7 At this time, the primary separation liquid is stored in the primary treatment liquid tank 10 installed at the lower portion of the vibration screen 7, and the primary separation solid content is discharged to the mud / aggregated sludge mixing tank 11 through the discharge port 9. The vibrating screen 7 may be another filter or classifier.

  Then, the primary separation liquid stored in the primary treatment mud tank 10 is sent to the cyclone 14 by the pump 13, is separated into solid and liquid by the swirling flow action, and the solid content discharged from the bottom of the cyclone 14 is the vibrating screen 7. And is again subjected to primary solid-liquid separation with the previous mud mud.

  The secondary separation liquid discharged from the upper part of the cyclone 14 is stored in the secondary processing liquid tank 15 and is sequentially fed to the mixing and stirring tank 18 by the pump 17, and the coagulant supply device 20 supplies the coagulant quantitatively. The baffle plate is added and stirred by the stirrer 19, and the mixed stirring liquid of the flocculant and the secondary treatment liquid is overflowed from the mixing stirring tank 18 so that the influent and the supernatant liquid are not directly mixed in the upper part. The third separated solids that have settled at the bottom, that is, the agglomerated sludge, is fed to the mud / agglomerated sludge mixing tank 11 via the pump 22, while the sludge is settled and removed. The liquid overflows and flows into the adjacent treated water tank 16.

  By doing so, the regenerated treated water is passed through the pump 24 to the receiver tank 1 as dilution water when the viscosity of the muddy mud is high on the vibrating screen 7 and to the secondary treatment liquid tank 15 as dilution water of the secondary treatment liquid. In addition to being able to be reused, it can be sent to a drilling fluid replenishing water tank (not shown) and reused, or discharged into rivers and sewers.

  On the other hand, the primary separated solids and the agglomerated sludge discharged to the mud / agglomerated sludge mixing tank 11 are mixed and agitated by the mixing agitation / conveyance screw conveyor 25 and conveyed to the outside of the mud / aggregated sludge mixing tank 11. The solidifying agent is fed from the solidifying agent tank 26 through the solidifying agent conveying screw conveyor 27 from the middle of the mixing agitating / conveying screw conveyor 25 and is modified by the solidifying agent and mixing agitating, and the mixing agitating / conveying screw conveyor. The modified soil is discharged from the tip of 25.

  By doing so, the reformed modified soil can be stored in the vicinity for backfilling, and can be loaded and transported to a dump truck (not shown) for general landfilling or banking.

  Although detailed explanation is omitted, drive control of the drive part (blower, pump, stirrer, screw conveyor, etc.) of this apparatus is performed by operation of the control panel 32.

  In addition, since this apparatus is entirely mounted on a truck, mud and mud treatment can be performed at or near the construction site.

  The side view which shows one Embodiment of the muddy mud processing apparatus in this invention.   FIG. 2 is a plan view of the apparatus of FIG. 1.   Part of a reverse side view of the device of FIG.   FIG. 2 is a rear view of the apparatus of FIG. 1.   The muddy mud treatment system figure in this invention.   The flowchart which shows one Embodiment of the muddy mud processing apparatus in this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Receiver tank 2 Blower 3 Hose 4, 4 'Baffle plate 7 Vibrating screen 8 Vibration motor 10 Primary liquid processing tank 11 Mud and agglomerated sludge mixing tank 12 Stirrer 14 Cyclone 15 Secondary processing liquid tank 16 Treated water tank 18 Mixed stirring Tank 19 Agitator 20 Coagulant supply device 21 Thickener 23 Treated water tank 25 Conveyor / mixing screw conveyor 26 Solidified material tank 27 Solidified material conveying screw conveyor 28 Modified soil 32 Control panel 40 Mud mud 41 Primary solid-liquid separation 42 Primary separation liquid 43 Primary separation solid content 44 Secondary solid separation 45 Secondary separation liquid 46 Secondary separation solid content 47 Tertiary solid-liquid separation 48 Coagulant 49 Treated water 50 Tertiary separation solid content 51 Solidified material 52 Reforming 53 Reforming soil

Claims (3)

  In the treatment of mud mud generated at the construction site, the mud mud is transported to the primary solid-liquid separator for primary solid-liquid separation, and the primary separated liquid is transported to the secondary solid-liquid separator for secondary solid-liquid separation. In addition, the secondary separation liquid is a tertiary solid-liquid separation, and the unseparated solid content is agglomerated and precipitated with a flocculant, and the supernatant liquid is reused as diluted water or drilling liquid as treated water or discharged into sewers and rivers. On the other hand, the solid content that has been secondarily separated is re-introduced into the primary solid-liquid separator, and the solid content that has been thirdarily separated is added to the solid content separated by the primary solid-liquid separation, mixed, stirred, and filled as modified soil. A system characterized by being reused as soil for return or general landfill.   As a device based on the above system, a mud mud transfer device, a primary solid-liquid separator for solid-liquid separation of the device, a secondary solid-liquid separator for secondary solid-liquid separation of the primary separated liquid, The apparatus comprises a device for coagulating and precipitating unseparated solids with a flocculant as a tertiary solid-liquid separation, and a device for mixing and stirring the separated solids with a solidifying agent to form a modified soil. Mud mud treatment equipment.   An in-vehicle muddy mud / sludge treatment apparatus, wherein the apparatus of claim 2 is mounted on a self-propelled truck or the like and can be treated at or near a construction site.

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