JP2008173571A - Muddy water treatment tank and muddy water treatment equipment - Google Patents

Abstract

An object of the present invention is to prevent adverse effects by solidifying cement fine particles when purifying turbid water containing cement fine particles as floating substances by supporting shotcrete or the like.
A water storage tank 12 for storing turbid water containing cement fine particles as a suspended substance, a bubble generator 14 disposed in the water tank 12, and a bubble generator 14 in the water tank 12 are disposed above the water tank 12. The floating material granulation promoting plate 16 having a plurality of through holes 17 through which bubbles and floating substances generated from the bubble generating device 14 pass, and the aggregated floating placed below each through hole 17 of the floating material granulation promoting plate 16 A collection container 18 for accumulating substances is provided. The suspended matter SS in the turbid water W introduced into the water storage tank 12 settles through the through hole 17, and the suspended matter SS is captured by the bubble B when the bubble B from the bubble generator 14 passes through the through hole 17. While this is repeated, the aggregated floating substance C is accumulated in the collection container 18.
[Selection] Figure 1

Description

  The present invention relates to a muddy water treatment tank for separating and removing cement fine particles contained in treated muddy water generated in tunnel excavation work and the like, and a muddy water treatment apparatus using the muddy water treatment tank.

  In tunnel excavation work, spring water is likely to be generated, and this spring water is mixed with earth and sand generated by the work to become muddy water. This turbid water must be discharged because it interferes with the construction work. If it is discharged as it is, it will contaminate rivers, etc., and it will be discharged into rivers after being treated with muddy water treatment equipment to a quality suitable for discharge. Is done. FIG. 6 shows an example of such a muddy water treatment apparatus. In FIG. 6, a certain amount of muddy water generated by tunnel construction is stored in the raw water tank 1 so that it can be continuously processed in a subsequent process. The muddy water stored in the raw water tank 1 is sent to the neutralization tank 2 where it is neutralized by receiving the supply of carbon dioxide gas. The neutralized turbid water is sent to the agglomeration reaction tank 3, where the polyaluminum chloride and the polymer flocculant are injected, and the slurry in the turbid water is agglomerated. The turbid water containing the agglomerated slurry is then sent to the thickener 4 where it is separated into upper layer top water and lower layer agglomerated slurry. The upper water from the upper layer overflows from the thickener 4 and enters the treated water tank 5, where it is temporarily stored and then discharged into a river or the like. The muddy water containing the slurry precipitated in the lower layer of the thickener 4 is temporarily stored in the slurry tank 6 and then sent to the filter press 7. In the filter press 7, the agglomerated slurry is compressed and filtered to form a dehydrated cake, which is discharged to a predetermined location, and the filtrate squeezed at that time is returned to the raw water tank 1.

On the other hand, as a basic technique for turbid water treatment, there is known an apparatus for removing and purifying suspended solids (SS, also called suspended solids) using turbid water (for example, patents). Reference 1). This is because water quality active purifiers are injected into raw water containing pollutants in water bodies such as ponds and mixed and stirred to agglomerate organic substances and nutrient salts that are suspended and dissolved mainly in water. Then, fine bubbles are jetted and the aggregates are floated and separated on the water surface by the fine bubbles to separate and remove the pollutant from the water. In addition, electrolyzing the sewage stored in the treatment tank using an electrolysis device without using a water quality purification agent separates the soil components such as organic matter contained in the sewage and generates fine bubbles in the sewage. An apparatus is also known that floats and separates dirt components (see, for example, Patent Document 2).
JP 2003-117562 A JP 2006-136767 A

  In the above-described conventional sewage treatment apparatus, pollutants such as organic substances are mainly targeted for separation and removal, but turbid water in tunnel construction and the like contains pollutants other than organic substances. For example, sprayed concrete used as a supporting member in tunnel construction, cement-based injection material in the auxiliary method, cement fine particles generated by washing water of an agitator car, and the like. When such cement fine particles are contained in muddy water, in the muddy water treatment apparatus as described above, the cement fine particles may be solidified in the lower part of the thickener or in the pipe from the thickener to the slurry tank, and the muddy water treatment of the apparatus may become impossible. is there. For this reason, the operation of the muddy water treatment apparatus may have to be stopped for cleaning and maintenance, resulting in a problem that leads to a delay in the process. In addition, vacuum cleaning and chip cleaning are required, which requires labor and cleaning costs. In addition, the filter cloth of the filter press may be clogged, making it impossible to treat muddy water, which increases the frequency of replacement of the filter cloth, leading to high costs. Furthermore, there is a problem that the amount of chemicals (carbon dioxide, hydrochloric acid or sulfuric acid) for neutralization treatment in the neutralization tank increases due to the mixing of strong alkali cement particles in the turbid water, which increases the cost. .

  The present invention has been made to solve such a conventional problem, and provides a turbid water treatment tank and a turbid water treatment apparatus capable of separating and removing cement fine particles contained in treated muddy water easily and efficiently. For the purpose.

  The turbid water treatment tank of the present invention is disposed above a water storage tank for storing turbid water containing cement fine particles as a suspended substance, a bubble generating device disposed in the water storage tank, and the bubble generating device in the water storage tank. And a floating material granulation promoting plate having a plurality of through holes through which the bubble generated from the bubble generating device and the floating material pass.

  When turbid water containing cement fine particles as floating substance is introduced into the reservoir from above, the turbid water flows down through the through hole of the suspended substance granulation promoting plate and fills the reservoir. Therefore, when a bubble is generated by a bubble generator arranged in the lower part of the water tank, the bubble rises through the through hole of the floating material granulation promoting plate, and traps the floating material containing cement fine particles. While rising. The suspended matter floating on the floating material granulation promotion plate settles again in the through-hole of the suspended matter granulation promotion plate together with the muddy water introduced into the water tank, and is also trapped in the bubble and suspended matter granulation promotion plate Levitate the through hole. During repeated levitation and sedimentation, cement fine particles solidify due to hydration reaction, so they are gradually combined and granulated, and granulation of suspended matter is promoted when the natural sedimentation force due to its own weight exceeds the levitation force of the bubble. It drops through the plate's through hole and accumulates in the water tank. Therefore, by collecting the aggregated suspended solids accumulated in the water storage tank after a certain period of time, the cement fine particles in the muddy water can be separated and removed easily and efficiently.

  Further, the turbid water treatment tank of the present invention is a collection container for accumulating the aggregated floating substance that is granulated by combining the bubble and the floating substance below each through hole of the floating substance granulation promoting plate. It is provided with. The granulated agglomerated suspended solids can be recovered from the storage tank by the recovery device if the storage tank is equipped with a recovery device such as vacuum, but if there is no such recovery device By arranging the recovery container below each through hole of the floating substance granulation promoting plate, the aggregated floating substance accumulated in the recovery container can be recovered from the recovery container.

  Moreover, the muddy water treatment tank of the present invention includes a guide pipe provided at a position where the collection container faces below each through hole of the floating substance granulation promoting plate, and a container main body that supports the guide pipe. It is characterized by becoming. Agglomerated suspended matter descending through each through hole of the suspended matter granulation promoting plate is guided to the guide pipe and accumulated in the container body, and the turbid water that flows down together with the aggregated suspended matter overflows from the container body. Only the aggregated suspended solids can be easily and efficiently stored in the container body.

  The muddy water treatment tank of the present invention is characterized in that the floating substance granulation promoting plate and the recovery container are detachably attached to the water storage tank. By attaching the floating material granulation promoting plate and the recovery container to the water tank so that they can be attached and detached, the aggregated floating material can be removed by removing the floating material granulation promoting plate and the recovery container from the water tank when collecting the aggregated floating material. Can be easily recovered.

  In another embodiment of the turbid water treatment tank of the present invention, a water storage tank for storing turbid water containing cement fine particles as a suspended substance, a bubble generator disposed in the water storage tank, and the bubble in the water storage tank The floating material granulation promotion plate disposed above the generator and having a plurality of insertion holes penetrating in the vertical direction, and the bubble generation is detachably inserted into each insertion hole of the floating material granulation promotion plate A plurality of plug members having a bubble generated from the apparatus and a through-hole through which the floating substance passes, and a space between the plug member and a diameter equal to or less than the plug member and below the plug member; And a collection container for accumulating the aggregated floating substance that is granulated by combining with the floating substance while passing through the through hole of the plug member. With this configuration, by removing the plug member connected to the collection container from the suspended material granulation promotion plate, the collection container can be taken out with the suspended material granulation promotion plate fixed to the water storage tank. Accumulated aggregated suspended solids can be easily recovered.

  Moreover, the muddy water processing apparatus of this invention is equipped with the above-mentioned muddy water processing tank as a raw water tank, and has a several process for processing and purifying muddy water from the said raw water tank. More specifically, the turbid water treatment apparatus includes a raw water tank that stores a certain amount of turbid water containing cement fine particles as a suspended substance and aggregates and removes the cement fine particles, a neutralization unit that neutralizes turbid water sent from the raw water tank, An agglomeration reaction vessel for agglomerating slurry in muddy water by supplying polyaluminum chloride and a polymer flocculant to neutralized muddy water, and a thickener for separating the slurry and clean water by settling the agglomerated slurry in muddy water And a release treatment water tank that stores and discharges the separated water, a slurry tank that stores muddy water containing the settled slurry, and compresses and filters the muddy water stored in the slurry tank into a dehydrated cake and a filtrate. It has a filter press.

  The turbid water treatment tank of the present invention includes a water tank for storing turbid water containing cement fine particles as a suspended substance, a bubble generator disposed in the water tank, and a bubble generator disposed in the water tank. The suspended matter granulation promoting plate having a plurality of small-diameter through holes that allow bubbles and suspended matter to pass through from the generator, so that the turbid water introduced into the water storage tank The cement fine particles are combined and granulated while flowing down through the through-holes, and the suspended matter passes through the through-holes of the suspended solids granulation promotion plate and repeats the rising and sinking action due to the bubbles generated by the bubble generator. Since it descends by its own weight and accumulates in the water storage tank, the cement fine particles in the muddy water can be easily and efficiently captured and removed.

  In addition, by using this turbid water treatment tank as a raw water tank of the turbid water treatment apparatus, cement fine particles are solidified in the lower part of the thickener or in the pipe from the thickener to the slurry tank, and the turbid water treatment of the apparatus becomes impossible. Therefore, vacuum cleaning and chip cleaning are not required, and labor and cleaning costs can be reduced. Furthermore, it is possible to avoid clogging of the filter cloth of the filter press and impairing muddy water treatment, and further, neutralization treatment in the neutralization tank by mixing strong alkali cement particles in muddy water. For example, a large amount of chemicals (carbon dioxide, hydrochloric acid or sulfuric acid) is unnecessary.

(Embodiment 1)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. Since the whole structure of the turbid water treatment apparatus in the present invention is the same as that shown in FIG. 6, the following description will be limited to the turbid water treatment tank as the raw water tank. Fig.1 (a) is a schematic sectional drawing of the muddy water processing tank in this Embodiment, FIG.1 (b) is the top view. In FIG. 1, a muddy water treatment tank 10 includes a water storage tank 12 that stores muddy water W containing cement fine particles as a suspended substance SS, a bubble generator 14 that is disposed at the bottom of the water storage tank 12, and a bubble in the water storage tank 12. A floating material granulation promoting plate 16 which is disposed above the generating device 14 and has a plurality of small-diameter through holes 17 through which the bubbles B and the floating material SS generated from the bubble generating device 14 pass. Under each of the 16 through holes 17, a collection container 18 is provided for accumulating aggregated suspended matter C (only a part of which is shown in the figure) formed by combining bubbles B and suspended matter SS. The turbid water W containing cement fine particles as the suspended matter SS is introduced from above the water storage tank 12 through the supply pipe 20 and discharged through the discharge pipe 24 by the drain pump 22.

  The bubble generating device 14 is of a type that generates water with a pressure of, for example, a water pump and sucks air with a negative pressure to generate a bubble with a diameter of micro to millimeter order. Here, the diameter is about several tens of microns. Although the microbubble generator is used, the diameter of the bubble to be generated is determined according to the particle size of the cement fine particles contained in the muddy water. The bubble generator is always operating during operation of the muddy water treatment tank. As other bubble generating devices, a cavitation method, a swiveling method, a pressure dissolution method, a venturi method, and the like can be used.

  The floating substance granulation promotion plate 16 is made of polypropylene or acrylic resin having a thickness of about 15 cm, and is detachably mounted on the two support pieces 11 provided on both the left and right wall surfaces of the water storage tank 12, respectively. It has become. Moreover, as shown in FIG.1 (b), the space | interval is provided between the wall surfaces of the water storage tank 12 in the both-side long side side of the water storage tank 12. As shown in FIG. This interval is for preventing the floating material granulation promoting plate 16 from overflowing when a large amount of muddy water is supplied through the supply pipe 20. The through-hole 17 is chamfered at the top and bottom so that the bubble B and the suspended matter SS can easily pass through. The diameter of the through hole 17 is about several mm to several cm, and here, the through holes 17 having a diameter of about 2 cm are formed with an interval of about 20 cm therebetween. As a material for the floating substance granulation promoting plate 16, other metal materials such as steel and aluminum can be used, and the surface may be subjected to treatment such as painting.

  The recovery container 18 includes a guide pipe 18a provided at a position facing the lower side of each through hole 17 of the suspended solid material granulation promoting plate 16, and a container body 18b that supports the guide pipe 18a, as shown in FIG. As described above, the four blades 18c are equally provided on the outer peripheral surface of the guide pipe 18a. By fitting the four blades 18c into the inner peripheral surface of the container body 18b, the guide pipe 18a is It is supported in a state of floating in the middle of 18b. The material of each part of the collection container 18 can be made of polypropylene or acrylic resin, or a metal material such as steel or aluminum, and the surface may be subjected to treatment such as painting. In addition, wire support pieces 18d are formed at four equal portions at the bottom of the container body 18b, and one end of the support wire 18f is inserted into the attachment hole 18e formed there, and the other end of the support wire 18f The entire collection container 18 is suspended in suspension by being hooked to hooks 18g attached to four locations around each through hole 17 of the granulation promoting plate 16. The length of the support wire 18f is set so that an interval of about several millimeters is provided between the distal end portion of the guide pipe 18a and the lower portion of the suspended material granulation promoting plate 16.

  Next, the effect | action of the muddy water processing tank 10 is demonstrated with reference to FIG. 1 and FIG. The muddy water W from the tunnel construction supplied from the supply pipe 20 to the storage tank 12 is mixed with cement particles such as sprayed concrete for support as suspended matter SS, and the suspended matter SS is used to promote granulation of suspended matter. It sinks through the through hole 17 of the plate 16. On the other hand, the bubbles B generated from the bubble generator 14 rise, and some of them rise through the through holes 17 and above the suspended material granulation promoting plate 16. At this time, some of the suspended matter SS that has settled is captured by the bubble B, floats on the suspended matter granulation promoting plate 16 through the through hole 17, and settles again through the through hole 17. Since the suspended matter SS has a large amount of cement that is solidified by the hydration reaction, the suspended matter SS is bonded to each other and granulated while repeating the sedimentation and floating. When the natural sedimentation force due to the dead weight of the granulated suspended matter SS exceeds the lifting force of the bubble B, the aggregated suspended matter C and the muddy water W pass through the guide hole 18a of the recovery container 18 from the through hole 17 and the container body 18b. Collected in. At this time, the guide pipe 18a serves to efficiently collect the aggregated suspended matter C without escaping. The turbid water W that has flowed into the container main body 18b escapes from the upper part of the container main body 18b, and only the aggregated suspended solid C is deposited in the container main body 18b. The aggregated floating substance C deposited in the container body 18b is stopped after a predetermined period of time, the apparatus is stopped, the container body 18b is removed from the water storage tank 12 together with the floating substance granulation promoting plate 16, the support wire 18f is removed, and the container is removed. The aggregated suspended matter C inside the main body 18b is removed. Thereafter, the container body 18b is locked to the suspended material granulation promoting plate 16 by the support wire 18f, and the suspended material granulation promoting plate 16 is placed on the support piece 11 of the water storage tank 12 to return to the original state, and the operation is resumed. To do.

Since the particle size of the suspended matter SS in the present embodiment is 0.075 mm or less, when the soil particle density is 2.65 g / cm ³ and the water temperature is 10 ° C., the sedimentation rate of the suspended matter SS is 13.9 m / h (about 23 cm). / Min). In actual sedimentation, the sedimentation speed decreases due to mutual interference, the occurrence of turbulence and drift, etc., so the above figures are approximate. The rising of the bubble B generated from the bubble generator 14 is 3 cm / min when the bubble B has a particle diameter of 0.01 mm, and the rising speed in the case of a bubble with a particle diameter of 1 mm is 500 to 600 cm / min. Accordingly, when one floating substance SS is captured and granulated by one valve B, the particle size of the bubble B is necessary for the granulated floating substance SS to overcome its settling velocity and rise. However, it is considered that about several hundred μm is necessary. Finally, when the settling force of the granulated aggregated floating substance C exceeds the floating force of the bubble B, it is recovered in the container body 18b.

  In addition, since the suspended-material granulation promoting plate 16 is heavy when the thickness is large as a whole, the through-hole 17 is made of a resin such as polypropylene or acrylic as shown in FIG. 3a. The remaining part except for the part may be formed integrally so as to be hollow. Alternatively, it may be divided into two in the vertical direction so as to face each other and join. The wall thickness t is preferably several millimeters to several centimeters, the overall thickness T is preferably about 15 cm, and the diameter of the through hole 17 is preferably about several millimeters to several centimeters.

(Embodiment 2)
Next, a second embodiment of the present invention will be described. As shown in FIG. 1, the overall configuration of the second embodiment is provided with a water storage tank 12 and a bubble generator 14 installed at the inner bottom thereof. Since it is the structure of the grain promotion board 16 and the collection | recovery container 18, only that point is demonstrated using FIG. 4 and FIG. In FIG. 4, a plurality of straight insertion holes 27 penetrating in the vertical direction are formed in the suspended material granulation promoting plate 26 at predetermined intervals. A plug (plug member) 28 made of polypropylene or acrylic is detachably inserted into the insertion hole 27. As shown in FIG. 5, the plug 28 includes an upper flange portion 28 a and a lower trunk portion 28 b, and a through hole 28 c similar to the through hole 17 of the first embodiment is formed in the central portion in the axial direction. Yes. Furthermore, a handle 28d is formed at two opposing outer peripheral portions of the flange portion 28a, and locking grooves 28e are formed at four equally divided outer peripheral portions of the trunk portion 28b in parallel to the axial direction. The handle 28d may have an arbitrary shape and structure, or the hook portion 28a may be thickened. A collection container 29 is detachably attached to the lower portion of the plug 28. The collection container 29 is made of polypropylene or acrylic, and is formed from a container body 29a having the same diameter as or smaller than the body part 28b of the plug 28, and upward from four equally divided portions at the upper end of the container body 29a. And the latching piece 29b. The locking piece 29b is detachably engaged with the locking groove 28e of the plug 28. The inner diameter of the locking piece 29b is set to be slightly smaller than the inner diameter of the locking groove 28e. Due to the elasticity of 29b, it is elastically locked to the locking groove 28e.

  Since the floating substance granulation promoting plate and the recovery unit in the second embodiment are configured as described above, the plug 28 is inserted into the insertion hole 27 of the floating substance granulation promoting plate 26 to thereby implement the first embodiment. In the same manner, the suspended matter SS in the bubble B and the turbid water W from the bubble generating device 24 can be levitated and settled between the through hole 28c of the plug 28 and the locking piece 29b of the recovery container 29, In addition, the suspended solid SS can be granulated by the bubbles B, and the aggregated suspended solid C can be deposited in the recovery container 29. After a predetermined period, the plug 28 is removed from the insertion hole 27 of the suspended material granulation promoting plate 26 with the handle 28d together with the collection container 29, and the aggregated suspended matter C accumulated in the collection container 29 can be easily removed. it can.

  In the second embodiment, the plug 28 and the recovery container 29 are connected by the locking piece 29b provided integrally with the recovery container 29. However, as in the first embodiment, a wire is used. Both ends thereof may be connected to the plug 28 and the collection container 29, respectively. Further, as in the first embodiment, a guide pipe may be provided in the collection container 29 via a blade.

  Also in the second embodiment, the suspended-material granulation promoting plate 26 may be formed so that the remaining part excluding the insertion hole 27 is hollow.

  In the first and second embodiments, the aggregated floating substance C is recovered using the recovery container 18 or 29. However, the aggregated floating substance settled from the through hole 17 or 28c without using such a recovery container. C may be deposited directly on the bottom of the water tank 12. In this case, the aggregated suspended matter C deposited on the bottom of the water storage tank 12 is removed manually or using a machine such as a vacuum device.

  As described above, the turbid water treatment tank and the turbid water treatment apparatus according to the present invention can easily and efficiently capture and remove cement fine particles from muddy water containing cement fine particles as floating substances. It can also be applied to dam construction work using cement, structural foundation work, etc.

It is sectional drawing (a) and top view (b) of the muddy water processing tank in Embodiment 1 of this invention. 4 is a perspective view of a collection container in Embodiment 1. FIG. FIG. 3 is an operation explanatory diagram according to the first embodiment. 6 is a partial cross-sectional view showing another example of the suspended solids granulation promoting plate in Embodiment 1. FIG. FIG. 6 is a cross-sectional view of a suspended substance granulation promoting plate, a plug, and a collection container in a second embodiment. 10 is an exploded perspective view of a plug and a recovery container in Embodiment 2. FIG. It is a block diagram explaining the schematic structure of the muddy water processing apparatus to which this invention is applied.

Explanation of symbols

B Bubble C Agglomerated suspended matter SS Suspended matter W Turbid water 10 Turbid water treatment tank (raw water tank)
DESCRIPTION OF SYMBOLS 11 Support piece 12 Water storage tank 14 Bubble generator 16 Floating substance granulation promotion board 18 Collection | recovery container 18a Guide pipe 18b Container main body 18c Blade | wing 18d Wire support piece 18e Mounting hole 18f Support wire 18g Hook 20 Supply pipe 22 Drain pump 24 Drain pipe 26 Floating material granulation promotion plate 27 Insert hole 28 Plug (plug member)
28a collar part 28b trunk part 28c through hole 28d handle 28e locking groove 29 collection container 29a trunk part 29b locking piece

Claims (6)

  A water storage tank for storing turbid water containing cement fine particles as a suspended substance, a bubble generating device disposed in the water storage tank, and disposed above the bubble generating device in the water storage tank and generated from the bubble generating device A muddy water treatment tank comprising a suspended material granulation promoting plate having a plurality of through holes through which the bubble and the suspended material pass.   The recovery container for accumulating the aggregated suspended solids formed by combining the bubbles and the suspended solids below each through hole of the suspended matter granulation promoting plate. The muddy water treatment tank according to 1.   The said collection | recovery container consists of a guide pipe provided in the position which opposes the lower part of each through-hole of the said floating substance granulation acceleration | stimulation board, and the container main body which supports the said guide pipe. The muddy water treatment tank of description.   The muddy water treatment tank according to claim 2 or 3, wherein the floating substance granulation promotion plate and the recovery container are detachably attached to the water storage tank.   A water storage tank for storing turbid water containing cement fine particles as a suspended substance, a bubble generating device disposed in the water storage tank, and a plurality of penetrating vertically disposed above the bubble generating device in the water storage tank A floating substance granulation promoting plate having insertion holes, and a through hole that is removably inserted into each insertion hole of the floating material granulation promoting plate to allow the bubble generated from the bubble generating device and the floating substance to pass therethrough. A plurality of plug members having a diameter equal to or smaller than that of the plug member, and a space is provided between the plug member and the plug member below the plug member, and the bubble and the floating substance pass through the through hole of the plug member. A turbid water treatment tank comprising a collection container for accumulating aggregated floating substances combined and granulated.   A muddy water treatment apparatus comprising the muddy water treatment tank according to any one of claims 1 to 5 as a raw water tank, and having a plurality of processes for treating and purifying muddy water from the raw water tank.

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