JP2005066426A - Mud water treatment apparatus and mud water treatment system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mud water treatment apparatus and a mud water treatment system which are easily carried to a construction site and can efficiently treat mud water. <P>SOLUTION: A dehydration apparatus 1 comprises a treatment container 3 having an open top as a mud inlet, having a mud outlet 9 on the bottom, and having as its side surface a mesh structure 5 containing in its inside a muddy water filtration layer 19 being a laminate of water-permeable inner and outer layers 13 and 17 and a filter cloth 15 and a press plate 23 formed within the container 3 in a manner capable of rise and fall, falling to press mud water fed into the container 3 to forcibly pass it through the layer 19 and to discharge it from the container 3, and rising to slide on the surface of the layer 19 to release adherent mud therefrom. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a muddy water treatment apparatus for treating muddy water generated at a civil engineering site or a construction site, and a muddy water treatment system using the muddy water treatment apparatus.

  When clay soil is included in the ground during civil engineering promotion work, a large amount of excess mud is generated by dissolving it in water. What is usually called surplus muddy water has a specific gravity of more than about 1.25, and unlike turbid water with a specific gravity of about 1.2, it will gel even if a flocculant is added and coagulate and separate mud as floc. It is difficult. In order to obtain floc from surplus muddy water, water must be once added to the muddy water to dilute, resulting in a significant increase in the surplus muddy water treatment volume. Therefore, a large amount of muddy water treatment equipment is required for the treatment of surplus muddy water, and it cannot be treated at the site, and in most cases is disposed as industrial waste.

  On the other hand, high moisture content specific viscosity soil is put into a bag with water permeability, and the moisture content is leached to the outside of the bag body by the compaction of the high moisture content specific viscosity soil to separate it from the sediment component, thereby high moisture content specific viscosity. Bagging dewatering methods for dewatering soil have been proposed (for example, Patent Document 1 and Patent Document 2).

Japanese Patent No. 2535302 Japanese Patent No. 3148815

  In the methods of Patent Document 1 and Patent Document 2, the object to be treated is mainly sludge, etc., and water is leached by the load of the high moisture content clay soil packed in the bag, and dehydration is performed using sun drying. It takes a long time for processing. Therefore, it is unsuitable for the dehydration process of the excess mud water generated one after another at the construction site such as the civil engineering construction work.

  An object of the present invention is to provide a muddy water treatment apparatus and a muddy water treatment system that can be easily brought into a construction site and can efficiently treat muddy water.

  In order to solve the above problems, a first aspect of the present invention is a muddy water treatment comprising: a moisture-permeable treatment container provided with a muddy water filtration layer on the inner surface; and a pressing member that pressurizes muddy water in the treatment container. It is an apparatus, Comprising: The said muddy water filtration layer is a muddy water processing apparatus characterized by laminating | stacking a water-permeable porous body and a filter cloth. According to the muddy water treatment apparatus according to the first aspect, the muddy water is separated into muddy soil and moisture by the muddy water filtration layer formed by laminating the water-permeable porous body and the filter cloth, and dewatered and reduced in weight. Can be achieved. Since this muddy water treatment apparatus has a simple configuration, it can be miniaturized and easily transported. In addition, since it consumes less power, it is suitable for use at construction sites. Therefore, muddy water treatment according to the purpose, application, construction conditions, etc. becomes possible. Further, since the volume can be reduced by dewatering the muddy water using this dewatering device and collecting it as a mud, the cost can be greatly reduced even when the mud is used for waste disposal.

  The second aspect of the present invention is the muddy water treatment apparatus according to the first aspect, wherein the muddy water filtration layer has a structure in which a filter cloth is sandwiched between water permeable porous bodies. It is. According to the muddy water treatment apparatus according to the second aspect, in addition to the same effect as the first aspect, by using a muddy water filtration layer having a structure in which a filter cloth is sandwiched between water permeable porous bodies, Separation and dehydration of water from muddy water can be performed efficiently.

  According to a third aspect of the present invention, there is provided a muddy water treatment apparatus according to the first or second aspect, wherein the pressing member is slidably disposed on the porous body surface of the muddy water filtration layer. It is. According to the muddy water treatment apparatus according to the third aspect, when the pressing member slides on the porous body surface, when the muddy water is pressed, the sealing performance is increased and sufficient pressure can be applied. It acts to scrape off the mud that adheres to the surface of the porous body, and can prevent clogging of the mud filtration layer.

  According to a fourth aspect of the present invention, there is provided the muddy water treatment apparatus according to the third aspect, wherein the pressing member includes a sliding contact surface that is in sliding contact with the surface of the porous body. According to the fourth aspect, since the pressing member has the sliding contact surface, it does not get caught on the surface of the porous body or damage the surface. Can be made.

  Further, the fifth aspect of the present invention is such that the top surface is opened as a muddy water introduction portion, the bottom portion has an agglomerated mud discharge portion, the side surface has a network structure, and the inner surface has a water-permeable porous body. A processing vessel provided with a muddy water filtration layer laminated with a filter cloth, and the inside of the treatment vessel can be moved up and down.When descending, the muddy water in the treatment vessel is pressed to force the muddy water filtration layer. A muddy water treatment apparatus comprising: a pressing member that passes through and is discharged to the outside of the treatment container, and slidably comes into contact with the surface of the muddy water filtration layer and peels off adhering mud when rising. According to this 5th aspect, the effect similar to the said 1st aspect is acquired.

  Moreover, the 6th aspect of this invention is a muddy water which laminated | stacked the water-permeable porous body and filter cloth used as a muddy water filtration layer of the muddy water treatment apparatus of any one of the 1st to 5th aspects. It is a filter. According to the muddy water filter of the sixth aspect, the same effect as that of the first aspect can be obtained.

  The seventh aspect of the present invention includes a mixing tank provided with a stirring means for stirring the muddy water to which the flocculant is added, a settling tank for allowing the muddy water after stirring to settle and sedimenting the agglomerated component, and the aggregating component. A muddy water treatment system, comprising the muddy water treatment device according to any one of the first to fifth aspects as the dehydration device. According to the muddy water treatment system of the seventh aspect, since the muddy water treatment apparatus of any one of the first to fifth aspects is provided, muddy water can be treated efficiently.

  In addition, an eighth aspect of the present invention includes the reflux dilution path according to the seventh aspect, wherein the supernatant in the sedimentation tank is collected and returned to the mixing tank, and the specific gravity of the muddy water at the time of adding the flocculant is adjusted. This is a muddy water treatment system. According to this muddy water treatment system, it is possible to effectively use the water separated from the muddy water through the reflux dilution path and adjust the specific gravity of the muddy water.

  According to the muddy water treatment apparatus and muddy water treatment system of the present invention, muddy water can be efficiently separated into muddy soil and moisture, and dewatering and weight reduction can be achieved. Therefore, it is suitable for use at construction sites such as muddy water propulsion work and mud concentration propulsion work.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing an appearance of a dehydrating apparatus 1 according to the first embodiment of the present invention, and FIG. 2 is a perspective view of a main part of a push plate 23 as a pressing member in the dehydrating apparatus 1. 3 and 4 are drawings showing a cross-sectional state of the dehydrating apparatus 1. 3, the left half shows a cross-sectional state at a position below the push plate 23, and the right half shows a cross-sectional state at the push plate 23 position.

  The dehydrating apparatus 1 includes a processing container 3 and a push plate 23 as a pressing member as main components. The processing vessel 3 has a top surface opened as a muddy water introduction portion, a funnel-like bottom plate 7 having a mud discharge portion 9, a side surface having a network structure 5, and a water-permeable porous body on the inner surface thereof. A muddy water filtration layer 19 in which an inner layer 13, an outer layer 17, and a filter cloth 15 made of sponge are laminated is provided.

  The muddy water filtration layer 19 has a laminated structure in which the filter cloth 15 is sandwiched between the inner layer 13 and the outer layer 17. Here, the inner layer 13 and the outer layer 17 are formed of a water-permeable porous material such as sponge, for example, and are configured to be deformed outward together with the filter cloth 15 at the time of sliding contact with the press platen 23. Considering the amount of deformation, it has a sufficient thickness. The main function of the inner layer 13 is filtration of the muddy water 51, and most of the flocks (muddy soil) in the muddy water 51 are separated by the inner layer 13. That is, the mud content in the muddy water 51 remains as a mud film 53 on the wall surface and inside of the inner layer 13, and only the moisture 55 passes through the filter cloth 15 and the outer layer 17, and further outside the processing vessel 3 through the mesh structure 5. Is discharged.

  The mud content of the mud film 53 deposited on the inner layer 13 is scraped off by sliding when the press plate 23 is raised and lowered, so that the water permeability can be easily recovered without causing clogging. In the case of directly filtering with the filter cloth 15 without providing the inner layer 13, the filter cloth 15 causes clogging due to fine mud particles, and even when pressure is applied by the push plate 23, it is difficult to transmit the moisture 55. The dehydration function is deteriorated early.

  The outer layer 17 is provided for the purpose of ensuring a sufficient amount of deformation at the time of sliding contact with the press plate 23 and for the purpose of surely preventing leakage of mud, but the outer layer 17 is omitted and the inner layer 13 and the filter cloth 15 are omitted. It is also possible to have a two-layer structure. Moreover, it can also be set as a multilayered structure further as needed.

  The filter cloth 15 is a cylindrical bag body as shown in FIG. 5, and further filters the water in a state in which most of the mud is removed by the inner layer 13 (turbid water state). There is no restriction | limiting in particular in the material and kind of the filter cloth 15, It can select and use from a woven fabric or a nonwoven fabric suitably. The thickness and permeability coefficient of the filter cloth 15 can be selected in consideration of the size of the dehydrator 1 and the state of clay in the mud 51. As a preferable example of the material of the filter cloth 15, a public sheet (registered trademark; manufactured by Asahi Kasei Kogyo Co., Ltd.) and the like can be mentioned.

  As the muddy water filtration layer 19 in the present embodiment, for example, one having a structure as shown in FIG. 5 is used. The muddy water filtration layer 19 includes an inner square tube 13 a and an inner bottom portion 13 b that constitute the inner layer 13, a cylindrical filter cloth 15, and an outer square tube 17 a and an outer bottom portion 17 b that constitute the outer layer 17. As the inner corner tube 13a and the outer corner tube 17a, four sponge plates can be bonded together to form a tube, or a tube processed at the time of molding can be used. The inner square tube 13a and the inner bottom portion 13b of the inner layer 13 or the outer square tube 17a and the outer bottom portion 17b of the outer layer 17 can be bonded in advance with an adhesive or the like. The cylindrical filter cloth 15 is narrowed at one end to form a constricted portion 15a that becomes a mud passage.

  The inner square tube 13a constituting the inner layer 13 is made smaller than the outer square tube 17a constituting the outer layer 17, and the inner bottom portion 13b is also made smaller than the outer bottom portion 17b. It can be inserted. A cross-shaped cut 18 is provided at each of the center portions of the inner bottom portions 13b and 17b so that the muddy water filtration layer 19 is assembled and overlaps with the throttle portion 15a of the filter cloth 15 so that the communication state can be maintained. .

  The muddy water filtration layer 19 is assembled by inserting the filter cloth 15 into the outer square tube 17a, and further inserting the inner bottom portion 13b and the inner square tube 13a into the filter cloth 15, and connecting the throttle portion 15a of the filter cloth 15 to the outer bottom portion 17b. This is done by inserting into the notch 18. Thereby, the inner layer 13 overlaps along the inner surface of the filter cloth 15, and the outer layer 17 overlaps the outer surface of the filter cloth 15. As described above, the muddy water filtration layer 19 as a muddy water filter having a three-layer structure can be easily assembled. By inserting the muddy water filtration layer 19 into the processing vessel 3 as it is, the dewatering device 1 can be formed. When the muddy water filtration layer 19 is deployed in the processing vessel 3, as shown in FIG. 4, the lower portion of the filter cloth 15 goes around the lower end of the inner layer 13 to cover the inner layer 13, and the muddy water 51 is not released. It is preferable. The narrowed portion 15a at the lower end of the filter cloth 15 can be fixed by providing a flange or the like (not shown) near the mud discharge portion 9, for example.

  The push board 23 is a member that presses the muddy water 51 in the dehydrator 1 and is provided so as to be able to move up and down in the processing container 3. The push plate 23 presses the muddy water 51 introduced into the treatment container 3 when descending, forcibly passes the muddy water filtration layer 19 and discharges it out of the treatment container 3, and when it rises, the surface of the muddy water filtration layer 19 is pushed. Slide to remove the attached mud. In the present embodiment, a pressing surface 29 having a rectangular shape in plan view is provided in accordance with the shape of the processing container 3, and the muddy water 51 is pressed by the pressing surface 29.

  The push plate 23 has a size (area) enough to contact at least the inner layer 13 of the muddy water filtration layer 19 when moving up and down. When the press platen 23 moves up and down, it comes into sliding contact with the inner layer 13 and acts to deform at least the wall surface of the inner layer 13 to remove the attached mud film 53. That is, the push board 23 also functions as a clogging prevention means for preventing the mud water filtration tank 19 from being clogged with the mud film 53. A portion where the press plate 23 abuts against the inner layer 13 is formed as a smooth sliding contact surface. In the present embodiment, the slidable contact surface 26 to the inner layer 13 in the push plate 23 has a shape protruding sideways in a mountain shape as shown in FIG. By adopting such a shape, even if the inner layer 13 is pressed to some extent, the inner layer 13 is not damaged or broken. The part where the press plate 23 abuts against the inner layer 13, that is, the shape of the slidable contact surface 26 is a rounded mountain shape as shown in FIG. 4, for example, a curved surface as in the press plate 23a shown in FIG. The shape which can be slid smoothly, such as the shape which has two or more rounded protrusions like the push board 23b shown in FIG. 7, can be mentioned. In order to pressurize the muddy water 51 in the processing container 3, a certain degree of sealing performance is required between the push plate 23 and the inner layer 13. Can do. Further, the push plate 23 is provided with a check valve 27, which is closed when the muddy water 51 is pressurized and is opened when the mud 51 is raised.

  The support column 21 is joined to the central portion of the push plate 23, and the push plate 23 can be moved up and down manually by raising and lowering the holding portion 25 formed at the end of the support column 21. The raising / lowering of the push plate 23 is not limited to manual operation, and an automatic raising / lowering mechanism can be provided.

  In the dehydrating apparatus 1 having the above configuration, the muddy water 51 is introduced into the processing container 3 by a pump or the like from the opened muddy water introducing portion. A flocculant is added to the mud 51 in advance to form a mud floc. When a predetermined amount of muddy water 51 is filled in the processing container 3, a force is applied to the push plate 23 to lower the muddy water 51 and pressurize the muddy water 51. The pressurized mud 51 passes through the mud filtration layer 19, and at this time, most of the mud is separated by the inner layer 13 and remains in the processing vessel 3. Most of the moisture 55 permeates through the filter cloth 15 and the outer layer 17, and is discharged through the mesh structure 5. The mud is collected in the lower part of the processing vessel 3 by the lowering of the push plate 23. The mud can be discharged from the mud discharge unit 9 by opening the valve 11. When the push plate 23 is lowered, some of the muddy water 51 goes up to the upper side of the push plate 23. However, when the push plate 23 is raised, the check valve 27 is opened, so that the muddy water 51 turned up flows down.

  Thus, the capacity | capacitance can be reduced significantly by dehydrating the muddy water 51. Since the dehydrating apparatus 1 has a simple configuration, it can be easily downsized and there are few restrictions on bringing it into the construction site. Therefore, by using the dehydrating apparatus 1, the capacity of the muddy water 51 that has been conventionally treated as industrial waste can be greatly reduced.

  FIG. 8 is a diagram showing an outline of a muddy water treatment system 101 provided with the dehydrating apparatus 1 of the present invention. The mud treatment system 101 includes a mud storage tank 31 and a dewatering device 1 as main components. In this muddy water treatment system 101, for example, a flocculant such as a cationic polymer is added to the muddy water 51 collected in the mud storage tank 31 and directly introduced into the dehydrator 1. In the dehydrator 1, pressure dehydration is performed as described above, and mud remains in the dehydrator 1. This mud is extracted from the bottom of the dewatering device 1 and conveyed by the screw conveyor 41 connected to the dewatering device 1 to be treated soil.

  Here, as the flocculant, a polymer flocculant can be used. Examples of the nonionic polymer include polyacrylamide. Examples of the anionic polymer include acrylic acid, methacrylic acid, itaconic acid, maleic acid. Examples of cationic polymers such as acid, acrylamide 2-methylpropane sulfonic acid, vinyl sulfonic acid, styrene sulfonic acid and the like, and copolymers thereof with acrylamide include dimethylaminoethyl acrylate and dimethyl methacrylate. Aminoethyl, dimethylaminopropylacrylamide, dimethylaminopropylmethacrylamide, acryloyloxyethyltrimethylammonium chloride, methacryloyloxyethyltrimethylammonium chloride, acryloylaminopropyltri Chill ammonium chloride, methacryloyloxy aminopropyl trimethylammonium chloride, acryloyl 2-hydroxypropyl chloride, copolymers of homopolymers or these and acrylamide such as methacryloyl 2-hydroxypropyl chloride and the like. Among these, an acrylic polymer flocculant having a molecular weight of 1 million or more and an ionization degree of 0 to 100 mol% is preferable, but a water-in-oil emulsion or salt having a dispersed particle size of 100 μm or less made of an acrylic polymer. More preferred is a polymer flocculant having the form of a dispersion in an aqueous solution.

  According to the muddy water treatment system 101 of the present embodiment, by using the flocculant and the dehydrating apparatus 1, not only turbid water having a specific gravity of about 1 to 1.2 but also high concentration of muddy water 51 having a specific gravity of about 1.25. If present, the flocculant can be added directly without dilution, and dehydration can be performed. Therefore, it is not necessary to dilute the muddy water 51 for adjusting the specific gravity, and an increase in volume can be avoided. In addition, you may provide the mechanism which automatically adjusts the automatic control mechanism of the addition amount of a coagulant | flocculant, and the spin-drying | dehydration processing speed (falling speed of the push board 23) as needed.

  FIG. 9 is a diagram showing an outline of a muddy water treatment system 102 according to another embodiment. Unlike the muddy water treatment system 101 in FIG. 8, this muddy water treatment system 102 includes a thickener 33 that settles and separates muddy water 51 to which a flocculant is added.

  The thickener 33 includes a mixing tank 35 equipped with a stirrer (not shown) that stirs the muddy water 51 to which the flocculant has been added, and a settling tank 37 that settles the agglomerate by allowing the mud water 51 after stirring to stand. I have. The flocculant is added to the muddy water 51 while being sent from the mud storage tank 31 to the thickener 33, and after sufficiently stirring in the mixing tank 35, the flocculant is allowed to stand in the settling tank 37. In the sedimentation tank 37, the supernatant and the sedimentary aggregate (floc) are separated by the action of the flocculant, so the aggregate is extracted from the bottom of the sedimentation tank 37 and introduced into the dehydrator 1 by the pump 39, and the same as described above. To dehydrate under pressure. In this way, by allowing the floc to settle and separate with the thickener 33, the dewatering efficiency can be further increased.

  In the present embodiment, a circulation path 38 for returning the supernatant in the sedimentation tank 37 to the mud storage tank 31 or the mixing tank 35 is provided. If the specific gravity of the muddy water 51 is too large, the flocculant added to the muddy water 51 cannot exhibit a desired aggregating effect and causes the muddy water 51 to gel. Therefore, the specific gravity of the muddy water 51 is set to 1.25, and if it exceeds this, it is necessary to adjust the specific gravity by adding water in advance. For the purpose of adjusting the specific gravity, the treated water can be effectively utilized if the water separated as the supernatant in the sedimentation tank 37 is returned to the mixing tank 35 via the circulation path 38. Other configurations in FIG. 9 are the same as those in FIG. 8, and thus the same components are denoted by the same reference numerals and description thereof is omitted.

  FIG. 10 is a diagram showing an outline of a muddy water treatment system 103 according to still another embodiment. This muddy water treatment system 103 is further provided with a granulating and solidifying device 43 in addition to the muddy water treatment system 102 of FIG. 9, and can be reused as improved soil simultaneously with the reduction of muddy water.

  In the present embodiment, the mud collected from the dehydration apparatus 1 in the same process as in FIG. 9 is mixed with the granulation solidification material supplied from the solidification material supply tank 45 in the granulation solidification apparatus 43, and has an arbitrary size. Granulated and solidified. As the granulated solidified material to be mixed here, for example, a gypsum-based solidified material can be used. By using a gypsum-based solidifying material, it is possible to neutralize mud and to obtain a granular improved soil excellent in workability, compaction and water permeability. Other configurations in FIG. 10 are the same as those in FIG. 9, so the same configurations are denoted by the same reference numerals and description thereof is omitted.

  The present invention has been described above with reference to various embodiments. However, the present invention is not limited to the above embodiments, and can be applied to other embodiments within the scope of the invention described in the claims. It is.

  The muddy water treatment apparatus of the present invention can be used for the purpose of dehydrating and reducing excess muddy water at a site such as civil engineering propulsion work and mud concentration propulsion work.

The perspective view which shows the outline | summary of a dehydration apparatus. The principal part perspective view of a push board. The drawing which shows the state of the cross section of a dehydrator. Drawing which shows the state of another cross section of a dehydrating apparatus. The exploded perspective view of a muddy water filtration tank. Drawing explaining the aspect of the sliding contact surface of a press panel. The figure explaining another aspect of the sliding surface of a press panel. The drawing which shows the outline | summary of one Embodiment of a muddy water processing system. Drawing which shows the outline | summary of another embodiment of a muddy water processing system. The figure which shows the outline | summary of another embodiment of a muddy water processing system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dehydrator 3 Processing container 5 Mesh-like structure 7 Bottom plate 9 Mud discharge part 11 Valve 13 Inner layer 13a Inner square tube 13b Inner bottom part 15 Filter cloth 15a Throttle part 17 Outer layer 17a Outer square cylinder 17b Outer bottom part 19 Mud filter layer 21 Strut 23 Pusher 25 Gripping part 26 Sliding contact surface 27 Check valve 31 Mud storage tank 33 Thickener 35 Mixing tank 37 Sedimentation tank 39 Pump 51 Mud water 53 Mud film 55 Moisture 101, 102, 103 Mud water treatment system

Claims (8)

A moisture-permeable treatment vessel with a mud filtration layer on the inner surface;
A muddy water treatment apparatus comprising a pressing member that pressurizes muddy water in the treatment container,
The muddy water filtration layer is configured by laminating a water-permeable porous body and a filter cloth, and a muddy water treatment apparatus. 2. The muddy water treatment apparatus according to claim 1, wherein the muddy water filtration layer has a structure in which a filter cloth is sandwiched between water permeable porous bodies. 3. The muddy water treatment apparatus according to claim 1, wherein the pressing member is slidably disposed on the porous body surface of the muddy water filtration layer. The muddy water treatment apparatus according to claim 3, wherein the pressing member includes a sliding contact surface that contacts the surface of the porous body. The top surface is opened as a muddy water introduction section, the bottom has a cohesive mud discharge section, the side has a mesh structure, and a muddy water filtration layer with a water-permeable porous material and filter cloth laminated on the inner surface Treated container,
The inside of the processing vessel is provided so that it can be raised and lowered, and when it is lowered, the muddy water in the processing vessel is pressed to forcibly pass through the muddy water filtration layer and discharged out of the processing vessel. A pressing member that slidably contacts and peels off the attached mud,
A muddy water treatment apparatus, comprising: A muddy water filter in which a water-permeable porous body and a filter cloth are laminated, which is used as a muddy water filtration layer of the muddy water treatment apparatus according to any one of claims 1 to 5. A mixing tank equipped with a stirring means for stirring the muddy water to which the flocculant has been added, a settling tank for allowing the muddy water after stirring to stand and settling the agglomerated component, and a dehydrator for dehydrating the agglomerated component. ,
A muddy water treatment system comprising the muddy water treatment device according to any one of claims 1 to 5 as the dewatering device. 8. The muddy water treatment system according to claim 7, further comprising a reflux dilution path for separating the supernatant in the sedimentation tank and returning it to the mixing tank.

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