JP3610458B2 - In-situ mixed processing method and in-situ mixed processing equipment for contaminated soil at the bottom of the water - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, the bottom mud ground forming the bottom of a harbor, river, lake, etc. contaminated with dioxins, heavy metals such as lead and mercury, polychlorinated bifinyl (usually abbreviated as pcb), etc. It belongs to the technical field of in-situ mixing processing method that stirs and mixes with the ground stabilizer so that the pollutants do not diffuse, and the in-situ mixing processing device used for the implementation of the method.
[0002]
[Prior art]
In general, contamination by dioxins, heavy metals such as lead and mercury, polychlorinated bifinyl (pcb), etc. is common in inland seas and harbors. The idea of countermeasures such as dioxins in contaminated sea areas, rivers, lakes, etc. is to first take measures against the source and suppress the expansion of the contamination range. Originally, it is desirable to remove the bottom mud contaminated with dioxins, etc., but the bottom mud layer thickness is very thin (usually about 30 cm to 100 cm, on average about 50 cm) in many cases, At present, there is no machine or work boat suitable for removing this. Moreover, even if it is removed, a large amount of money is incurred for detoxifying the dredging and removed bottom mud, and it is often difficult to secure a place for final disposal.
[0003]
Conventionally, a method of trapping the bottom mud by soaking sand with a suitable layer thickness (laying sand) on the contaminated bottom mud and so-called covering sand has been carried out. However, there is a drawback that the diffusion of dioxins and the like into water cannot be completely prevented.
On the other hand, the method of solidifying with a ground stabilizer so that the pollutants do not diffuse is still in the development stage, and no technical completion has been seen.
[0004]
[Problems to be solved by the invention]
The object of the present invention is to stabilize the ground so that the pollutants do not diffuse in situ at the bottom mud ground forming the bottom of harbors, rivers, lakes, etc. contaminated with dioxins, heavy metals, polychlorinated bifinyl, etc. It is providing the construction method which stirs and mixes with a material and solidifies, and the in-situ mixing processing apparatus used for implementation of the construction method. This is because solidification treatment is considered to be particularly effective when the concentration level of dioxins in the bottom mud is a value equal to or higher than the sediment environmental standard value. Solidification of bottom mud contaminated with dioxins, etc. does not reduce the dioxin content, but dioxins are difficult to dissolve in water. Since it is thought that it moves and diffuses by adhering to (SS), the occurrence of SS can be suppressed by solidifying the bottom mud ground. As a result, it is difficult to move the bottom mud contaminated with dioxins and the like, and an effect of preventing diffusion can be expected.
[0006]
[Means for Solving the Problems]
As a means for solving the above-described problems of the prior art, an in-situ mixing treatment method such as water-bottom contaminated soil according to the invention described in claim 1 is:
The mixing treatment casing that opens downwardly in the in-situ mixing treatment equipment with one or more stirring and mixing shafts is lowered toward the contaminated soil etc. of the bottom of the water while draining the water in the casing, and contaminated with the mixing treatment casing. Partition to a certain depth so as not to disturb the soil, etc., and then rotate the stirring and mixing shaft and inject a cement-based solidified material or other ground stabilization material with a low pH value to mix and stir It is characterized by solidifying the contaminated soil and the like, and then raising the mixing treatment casing while supplying water into the mixing treatment casing.
[0007]
In-situ mixing treatment method such as contaminated soil of the bottom of the water according to the invention described in claim 2 ,
Lay the sand with a desired layer thickness on the contaminated soil at the bottom of the water, and then remove the water in the casing from the in-situ mixing processing unit that opens downwardly in the in-situ mixing processing unit equipped with one or more stirring and mixing shafts. While draining, it descends toward the contaminated soil at the bottom of the water and partitions it to a certain depth so as not to disturb the covered sand and contaminated soil with a mixing treatment casing. After that, the stirring and mixing shaft is driven to rotate and the cement-based solidified material. By injecting other ground stabilizers with low PH value and stirring and mixing, the contaminated soil at the bottom of the water is solidified with the covering sand, and then the mixing treatment casing is supplied while supplying water into the mixing treatment casing. It is characterized by raising.
[0008]
The invention described in claim 3 is an in-situ mixed treatment method for contaminated soil in the bottom of the water according to claim 1 or 2 ,
The plurality of agitation and mixing shafts in the mixing treatment casing are characterized by agitating and mixing the contaminated soil and the like at the bottom of the water in a lapped state.
[0009]
The invention described in claim 4 is the in-situ mixed processing method for contaminated soil in the bottom of the water according to claim 1 or 2 ,
One or a plurality of stirring and mixing shafts in the mixing treatment casing is characterized in that the ground stabilizing material is injected from the position near the rotation shaft and the tip position of the stirring blade.
[0010]
The invention described in claim 5 is the in-situ mixed treatment method for contaminated soil in the bottom of the water according to claim 1 or 2 ,
The mixed treatment casing is lowered toward the contaminated soil at the bottom of the water while draining the water in the casing, and the mixed treatment casing is partitioned to a certain depth so as not to disturb the contaminated soil. It is characterized in that it is drained to a state where it is as little as possible, and is solidified by stirring and mixing in a state that does not involve water as much as possible.
[0011]
The invention described in claim 6 is an in-situ mixing treatment method such as contaminated soil in the bottom of the water according to any one of claims 1 to 5 ,
Consolidation treatment of contaminated soil at the bottom of the water is carried out with the planar shape and size of the mixed treatment casing as one unit, and the casing side plates adjacent to the already treated part are left in the unused state. It is characterized by advancing.
[0012]
An in-situ mixing treatment apparatus for contaminated soil at the bottom of the invention according to claim 7 ,
One or a plurality of stirring and mixing shafts are installed in the mixing treatment casing that opens downward, and a motor such as an electric motor or a hydraulic motor that rotationally drives the stirring and mixing shafts is installed on the outer surface of the mixing processing casing. The stirring and mixing shaft is connected by a transmission mechanism;
Means for lifting or lowering the mixing treatment casing in a substantially horizontal position on the water surface or from the land, means for supplying and controlling a power source from the water surface or from the land to the motor, and a ground stabilizer for the stirring and mixing shaft Each means for supplying slurry is provided,
A submersible pump for draining water in the mixing treatment casing or supplying water into the mixing treatment casing is installed on an outer surface portion of the mixing treatment casing .
[0014]
The invention described in claim 8 is the in-situ mixing treatment apparatus for contaminated soil in the bottom of the water according to claim 7 ,
The substantially vertical side plate forming the mixing casing is divided into a plurality of pieces, each of the divided plates is installed so as to be slidable in the vertical direction, and a slide driving means for the same side plate is provided. .
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, illustrated embodiments of the present invention will be described. The drawings show an embodiment of the in-situ mixing processing apparatus according to the inventions according to claims 7 and 8 , which is used for carrying out the in-situ mixing processing method for contaminated soil at the bottom of the water according to the inventions described in claims 1 to 6. Show. Accordingly, first, an embodiment of the in-situ mixing processing apparatus will be described first, and examples of the in-situ mixing processing method will be sequentially described.
[0016]
FIG. 1 shows an outline of solidification processing by an in-situ mixing processing device 6 suspended by a suspension wire 5 of a winch (pulley) 4 of a crane arm 3 on a dedicated work ship 2 floating on the water surface. On the dedicated work ship 2, a silo 21 for storing a ground stabilizer, a slurry plant 22 for processing the ground stabilizer into a slurry, and other materials and energy required for in-situ mixing processing such as contaminated soil. Power source, control device and other equipment, ship maneuvering room and dredging are installed and equipped. Reference numeral 12 in FIG. 1 indicates a guide rod mechanism for accurately determining the construction position of the in-situ mixing processing apparatus 6 suspended by the suspension wire 5 on the crane arm 3 protruding from the anchor of the dedicated work ship 2. .
[0017]
2 and 3 show details of the structure of the in-situ mixing processing device 6. FIG. 3 shows, as an example, a multi-axis apparatus in which 16 vertical stirring and mixing axes 60 are installed, but this is not restrictive. The layer thickness of the solidification treatment is preferably 50 cm to 150 cm even if the bottom mud 1 such as contaminated soil and the covering sand 10 are combined, so it is preferable to use the multiaxial mixing treatment device 6 so that the construction is not expensive. . However, the stirring and mixing shaft 60 may be constructed by a single-shaft device. Technically, the multi-shaft type apparatus can be implemented up to a scale of about 32 shafts with the stirring and mixing shaft 60 at the maximum. The effective height (length) of the stirring and mixing shaft 60 is that the layer thickness of the bottom mud 1 is usually about 30 cm to 100 cm as described above, and the sand 10 other than the bottom mud 1 and the original bottom ground In order not to stir and mix 11 unnecessarily, it is preferable to design it as about 100 cm as possible.
The main component of the in-situ mixing processing apparatus 6 is a rigid horizontal frame 61 (including a surrounding plate) that forms the upper surface of a horizontal casing, and side plates 63 that are divided and divided into four sides are independent. Each split plate is installed in a configuration that allows sliding up and down. The combination of the horizontal frame 61 and the side plate 63 constitutes a mixed processing casing 64 having a bowl-shaped and substantially watertight structure that opens downward (the invention according to claim 8 ). Reference numeral 66 in FIG. 2 denotes a sliding drive means such as a friction wheel or a rack and pinion mechanism installed to move the side plates 63 up and down individually.
[0018]
Although not shown in detail, in the mixing treatment casing 64, the stirring and mixing shaft 60 supported by the bearings installed in the horizontal frame 61 has a rotating angle of each stirring blade 60a as shown in FIG. It is installed in a downward direction with an arrangement in which it partially wraps and rotates with a phase difference of about 90 °. A rotary motor 62 such as an electric motor or a hydraulic motor installed on the upper surface (outside of the casing) of the horizontal frame 61 and each of the stirring and mixing shafts 60 is a gear type (not shown) provided using the horizontal frame 61. Alternatively, they are connected so as to rotate synchronously by a transmission mechanism such as a chain or belt type. A plurality of rotary prime movers 62 are installed on the horizontal frame 61 as necessary.
In addition, illustration of hydraulic hoses or power cables and control cables necessary for the rotary motor 62 is omitted for the sake of convenience. Further, illustration of a slurry hose and a distributor for supplying the ground stabilizer slurry produced at the slurry plant 22 on the dedicated work ship 2 to each stirring and mixing shaft 60 is also omitted.
[0019]
Reference numeral 65 in FIG. 2 is a submersible pump installed on the horizontal frame 61. This is because the water in the mixing treatment casing 64 is sucked and removed to the outside through the pipe 65a, or conversely, the external water sucked through the pipe 65a is sent into the stirring and mixing treatment casing 64, and one or more stand that has been installed.
[0020]
Next, a method of proceeding with the in-situ mixing processing method for solidifying the bottom soil contaminated soil (bottom mud 1) using the in-situ mixing processing apparatus 6 having the above configuration will be described.
Situ mixing apparatus 6 installed stirring and mixing shaft 60 as above mentioned, for example, suspended from a dedicated work ship 2 as shown in FIG. 1, the mixing process casing 64 which is open to its downward, the bottom of the water sediment 1 It is lowered (see also FIG. 4a). Next, as shown in FIG. 4b, the mixed processing casing 64 is slowly entered into the soil so as not to disturb the contaminated soil and the like, and is basically partitioned by the mixed processing casing 64 to a depth that reaches the original water bottom ground 11. . Thereafter, each agitating and mixing shaft 60 is rotationally driven, and a ground stabilizer slurry produced at the slurry plant 22 on the dedicated work ship 2 is injected and agitated and mixed with the bottom mud 1 in the mixing treatment casing 64, whereby the original Solidify at the position. Therefore, there is very little possibility that the bottom mud 1 is polluted or diffused during the solidification process. After sufficiently solidifying in this way, the in-situ mixing processing device 6 is pulled up to the next solidifying position as shown in FIG. 4c.
[0021]
The solidification treatment method adopted by the present invention uses a slurry-type cement-based solidified material, or a ground stabilizing material such as cement having a low PH value as required, and injects this into the contaminated soil. This is a construction method in which the soil is stirred and mixed and the pollutants are contained in the solidified soil using the chemical reaction between the two. As the ground stabilizing material, blast furnace cement, ordinary Portland cement, cement-based special solidifying material, etc. can be used as the cement-based solidifying material. When it is necessary to suppress the increase in the PH value as much as possible, a cement suitable for such purpose is used.
[0022]
Next, in the case of the in-situ mixing processing method for contaminated soil or the like according to the invention described in claim 1 , the mixing processing casing 64 that opens downwardly in the in-situ mixing processing device 6 is lowered toward the bottom mud 1 of the water bottom. In doing so, the submersible pump 65 is operated to lower the water in the casing 64 while draining (excluding) the water, thereby preventing the displacement and fluctuation of the in-situ mixing processing device 6 due to the resistance of the water and the mixing processing casing. 64 is devised so that diffusion is not generated as much as possible due to disturbance caused by contaminated soil or the like (bottom mud 1) in the water flow caused by the downward movement of 64. Thus, after partitioning to a predetermined depth so as not to disturb the contaminated soil or the like with the mixing treatment casing 64, each of the stirring and mixing shafts 60 is driven to rotate, and the ground stabilizer slurry is injected and mixed by stirring and mixing. soil or the like (sediment 1) you solidification processing. By draining the bottom mud portion partitioned by the mixing treatment casing 64 to a state where water is as little as possible, it is also preferable to perform solidification treatment with high strength and high quality without involving water during stirring and mixing.
When the in-situ mixing processing device 6 is lifted after the solidification processing is finished, this time, the submersible pump 65 is operated in reverse to supply external water into the mixing processing casing 64, and the mixing processing casing 64 is raised. It is also characterized by reducing the water flow resistance and water pressure resistance as much as possible.
[0023]
Furthermore, the in-situ mixed processing method for contaminated soil and the like according to the invention described in claim 2 is characterized in that the sand 10 is preliminarily applied on the contaminated soil (bottom mud 1) deposited on the bottom of the water. As already known, the laying sand 10 is carried out by spraying sand with a gut ship, a sanding ship or the like. The purpose of the laying sand 10 is to suppress contamination and diffusion of contaminated soil as much as possible by covering sand, and as mentioned above, the layer thickness of contaminated soil due to dioxins is generally thin, so mixing treatment is performed This is because it is necessary to make the solidified layer substantially thick with the sand 10 for the construction. That is, it is necessary to prevent as much as possible the hoisting and spreading of the bottom mud 1 by the stirring blades during the stirring and mixing process. Therefore, it is preferable that the uppermost stirring blade 60a in the stirring and mixing shaft 60 of the in-situ mixing processing device 6 is set in a working condition so that only a part of the lowermost layer of the bed sand 10 is stirred and mixed. Therefore, while the bottom mud 1 is usually deposited with a layer thickness of 30 cm to 100 cm, on average about 50 cm, the sand 10 is spread as thin as possible to about several tens of cm. It is publicly known that the solidified body mixed with sand due to the presence of the sand 10 is much stronger than the solidified body of only the silt 7 and the strength of the bottom mud 1 after the treatment can be increased. It is.
[0024]
According to a second aspect of the invention, after the laying sand 10 in the desired layer thickness on such contaminated soil water bottom as described above, similar to the invention described in claim 1, downward situ mixing apparatus 6 The mixing treatment casing 64 opened to the bottom is lowered toward the contaminated soil or the like on the bottom of the water while draining the water in the casing 64 with the submersible pump 65, and the sand 10 and the bottom mud below the mixing treatment casing 64. Partition to a certain depth so as not to disturb 1. Thereafter, the agitation and mixing shaft 60 in the mixing treatment casing 64 is rotated and the ground stabilizer slurry is injected and agitated and mixed, so that the contaminated soil or the like (bottom mud 1) in the bottom of the water is partially laid. 10 is solidified. Thereafter, when the in-situ mixing treatment device 6 is pulled up, the submersible pump 65 is operated in reverse to supply and raise external water into the mixing treatment casing 64, as in the first aspect of the invention. It is.
[0025]
By the way, what is important in the in-situ mixing treatment of contaminated soil with dioxins, which is the object of the present invention, is to leave no untreated part (unsolidified part), and the bottom mud 1 is solidified. There is a need to. Therefore, the multi-shaft stirring and mixing shaft 60 is configured such that each of the stirring blades 60a partially wraps and rotates as described with reference to FIG. 3 (invention described in claim 3 ).
However, as illustrated in FIG. 3 and FIG. 5, the gap S <b> 1 between the outer periphery of the stirring blade 60 a of the stirring and mixing shaft 60 at the outermost peripheral position and the inner surface of the casing side plate 63, and the stirring and mixing shaft 60 adjacent to each other. The gaps S2 that cannot be reached by the blades 60a are inevitably generated physically and mechanically and easily become unprocessed portions. As a means for solving this problem, in the present invention, as shown in FIG. 5, the stirring and mixing shaft 60 in the mixing treatment casing 64 injects the ground stabilizer slurry at a position near the rotating shaft of the stirring blade 60a. A shaft side injection portion 60b is provided, and a tip injection portion 60c for injecting the ground stabilizer slurry from the tip position is also provided. Further, the entire solidification process is effected even in the portion where the stirring blade 60a does not reach by the powerful slurry jet Q from the tip injection portion 60c (the invention described in claim 4 ). This prevents the occurrence of substantial unprocessed parts.
[0026]
Next, as a plan for effective use when the operation of the submersible pump 65 is premised as in the invention described in the first or second aspect , the mixing treatment casing 64 is used for solidifying the contaminated soil on the bottom of the water. The water in the casing 64 is lowered toward the contaminated soil at the bottom of the water while draining the water, and the mixed processing casing 64 is partitioned to a certain depth so as not to disturb the contaminated soil. It is preferable to continue the drainage until the water is as little as possible, and to perform the solidification treatment with stirring and mixing in the state where the water is not involved as much as possible (the invention described in claim 5 ).
[0027]
Next, the method of performing the in-situ mixing process using the in-situ mixing processing apparatus 6 having the configuration illustrated in FIG. 2 and FIG. It is a solidification processing method. Inevitably, the in-situ mixing process for solidifying contaminated soil at the bottom of the water will proceed with the planar shape of the mixing process casing 64 and its size as a unit. As an example, in the case of the 16-axis type apparatus shown in FIG. 3, the construction of the batch system is advanced with a square having a side length of about 4 m as one unit.
[0028]
FIG. 6 shows the progress of such construction. Construction is proceeded in the order of reference numerals 1, 2, 3, and 4. Although n + 1 in the second row is currently under construction, in this case, the casing side plate adjacent to the already-processed portion indicated by hatching is left in a non-use state, and the other two casing side plates 63 are disposed. , 63 is used to proceed with the construction (the invention described in claim 6 ). This is because the already processed portion has already been solidified, and if the casing side plate is forcibly interposed there, a substantial lap construction (integrated construction) between the solidified bodies cannot be performed. In this sense, for example, the existence significance of the slide driving means 66 of the side plate 63 shown in FIG. 2 is significant.
[0029]
Next, FIG. 7 shows a mode in which a crawler crane 71 is placed on a work table ship 70 for reference and the in-situ mixing processing device 6 is suspended by a wire 73 to perform in-situ mixing processing such as contaminated soil on the bottom of the water. Show. The loading of materials, plants, and other equipment necessary for in-situ mixing processing such as contaminated soil on the work table ship 70 is the same as in the embodiment of FIG.
[0030]
Therefore, although not shown in the figure, when the in-situ mixing process in the vicinity of the shore is performed, the in-situ mixing processing device 6 is hung by a land crawler crane or the like, and the in-situ position such as contaminated soil on the bottom of the water A mixing process can also be carried out.
[0031]
Finally, FIGS. 8 to 10 show an embodiment of the in-situ mixing apparatus 6 with a horizontal stirring and mixing shaft 60. FIG. 9 shows a four-axis type. Of course, the stirring blades 60a of the respective axes are arranged so as to rotate and wrap with a constant phase difference (FIG. 10). Each stirring and mixing shaft 60 is synchronously rotated by a rotary prime mover 62 on a horizontal frame 61. The other configurations are not particularly different from the apparatus shown in FIG. 2 and the like, and are used in the same manner to perform in-situ mixing processing such as contaminated soil on the bottom of the water.
[0032]
【The invention's effect】
Since the in-situ mixing treatment apparatus according to the inventions described in claims 7 and 8 is used to perform in-situ mixing processing such as contaminated soil on the bottom of the water as in the inventions described in claims 1 to 6 , Sediment mud is solidified under the conditions to contain harmful substances in-situ, and there is no concern about suspension or diffusion due to pollutants. Of course, after the solidification treatment, it is possible to reliably prevent the secondary contamination that the pollutant is eluted or diffused in the water area. This is because the solidified body does not deteriorate and is stable in the long term.
[0033]
According to the present invention, a relatively thin bottom mud can be processed in a large amount and efficiently in a short period of time, so that the total cost can be reduced.
[Brief description of the drawings]
FIG. 1 is an elevational view showing an embodiment of an in-situ mixed treatment method for contaminated soil at the bottom of the water according to the present invention.
FIG. 2 is an elevation view showing the in-situ mixing processing apparatus.
FIG. 3 is a bottom view of the in-situ mixing processing apparatus.
FIGS. 4A to 4C are explanatory views showing the main steps of the in-situ mixing treatment method.
FIG. 5 is an explanatory diagram of in-situ mixing processing.
FIG. 6 is a progress explanatory diagram of the in-situ mixing processing method.
FIG. 7 is an elevational view showing different embodiments of the in-situ mixed processing method for contaminated soil in the bottom of the water according to the present invention.
FIG. 8 is an elevational view showing a different embodiment of the in-situ mixing processing apparatus.
FIG. 9 is a bottom view of the in-situ mixing processing apparatus.
FIG. 10 is a side view of the in-situ mixing processing apparatus.
[Explanation of symbols]
60 Mixing stirring shaft 6 In-situ mixing processing device 64 Mixing processing casing 1 Contaminated soil (bottom mud)
65 Submersible pump 10 Sediment sand 60a Agitation blade 66 Slide drive means 5 Hanging wire

Claims (8)

The mixing treatment casing, which opens downwardly in the in-situ mixing treatment device with one or more stirring and mixing shafts, is lowered toward the contaminated soil at the bottom of the water while draining the water in the casing, and contaminated with the mixing treatment casing. Partition to a certain depth so as not to disturb the soil, etc., and then rotate the stirring and mixing shaft and inject a cement-based solidified material or other ground stabilization material with a low PH value to mix and stir An in-situ mixed treatment method for contaminated soil in the bottom of the water, which solidifies the contaminated soil and then raises the mixed treatment casing while supplying water into the mixed treatment casing. Place sand with a desired layer thickness on contaminated soil, etc. at the bottom of the water, and then turn the water in the casing into a mixing treatment casing that opens downwardly in the in-situ mixing treatment device with one or more stirring and mixing shafts installed. While draining, it descends toward the contaminated soil etc. at the bottom of the water and partitions it to a certain depth so as not to disturb the covered sand and contaminated soil etc. with the mixing treatment casing, and then drives the stirring and mixing shaft and cement-based solidified material By injecting other ground stabilizers with low PH value and stirring and mixing, the contaminated soil at the bottom of the water is solidified with the covering sand, and then the mixing treatment casing is supplied while supplying water into the mixing treatment casing. An in-situ mixed treatment method for contaminated soil at the bottom of the water, characterized by raising the soil. A plurality of stirring and mixing shaft of the mixing process the casing is characterized by mixing and stirring the water bottom of the contaminated soil or the like to each other in the lap state situ mixing process of water bottom or the like of the contaminated soil according to claim 1 or 2 Construction method. The bottom or bottom stirrer according to claim 1 or 2 , wherein the one or more stirring and mixing shafts in the mixing casing inject ground stabilization material from the position near the rotation shaft of the stirring blade and from the tip position. In-situ mixed processing method for contaminated soil. The mixed treatment casing is lowered toward the contaminated soil at the bottom of the water while draining the water in the casing, and the mixed treatment casing is partitioned to a certain depth so as not to disturb the contaminated soil. 3. The in-situ mixing treatment method for contaminated soil at the bottom of the water according to claim 1 or 2 , characterized by draining to the least possible state and stirring and mixing in a state in which water is not entrained as much as possible. Consolidation treatment of contaminated soil on the bottom of the water is carried out with the planar shape and size of the mixed treatment casing as a unit, and the casing side plate adjacent to the already treated part is left in the unused state. The in-situ mixing treatment method for contaminated soil in the bottom of the water according to any one of claims 1 to 5 , wherein the method proceeds. One or a plurality of stirring and mixing shafts are installed in a mixing treatment casing that opens downward, and a prime mover such as an electric motor or a hydraulic motor that rotationally drives the stirring and mixing shafts is installed on the outer surface of the mixing processing casing. The stirring and mixing shaft is connected by a transmission mechanism;
Means for lifting or lowering the mixing treatment casing in a substantially horizontal position on the water surface or from the land; means for supplying and controlling a power source from the water surface or from the land to the motor; and a ground stabilizer for the stirring and mixing shaft. Each means for supplying slurry is provided,
A submersible pump for draining water in the mixing treatment casing or supplying water into the mixing treatment casing is installed on the outer surface of the mixing treatment casing.
In-situ mixing treatment equipment for contaminated soil at the bottom of the water. The substantially vertical side plate forming the mixed processing casing is divided into a plurality of pieces, each of the divided plates is installed so as to be slidable in the vertical direction, and slide drive means for the same side plate is provided. An in-situ mixing treatment apparatus for contaminated soil at the bottom of the water according to claim 7 .

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