JP3331364B2 - Industrial waste pit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shut-off concrete pit for enclosing highly hazardous waste, and more particularly to a technique for more reliably preventing leakage of harmful substances after burial.

[0002]

2. Description of the Related Art Increasing industrial waste has been of particular interest in recent years with regard to the safety of its final disposal sites. Industrial waste discharged in the course of seed business activities is extremely large, and it is difficult to completely remove harmful substances even by various intermediate treatments (detoxification treatment). Long-term safety after dumping is a problem.

[0003] A point to be considered in the safety of the final disposal site is the leakage and leakage of harmful substances to the landfill soil. For the final disposal of industrial waste, the national and local governments have set detailed standards for ensuring safety. Here, FIG.
Is a disposal site using a so-called cut-off concrete pit. A fence 2 is provided around the disposal site 1, a standing sign 3 on which necessary display items are described is provided, and a waste 4 is reclaimed. An internal partition 6 is provided in the pit 5, and the shut-off pit 5 filled with waste is sealed with a concrete lid 7 while the pit 5 being dumped is provided with a roof 8 to prevent rainwater.

[0004] A disposal site using such a shut-off pit 5 is mainly filled with incinerated ash such as waste liquid sludge or plastic having high harm. Although these have been subjected to intermediate treatment for detoxification, the technical inconvenience of disposal has been reduced, for example, trace amounts of mercury and cadmium added as stabilizers and coloring agents remain in plastic incineration ash. There are many things to accompany. And there has been no conventional use of such a blocking pit that exceeds the administrative guidance standard. In other words, the conventional technology only increases the concrete thickness of the pit or arranges a waterproof sheet on the inner wall surface of the pit (for example, Japanese Patent Application Laid-Open No. 59-13618).
3) Guaranteeing more reliable and permanent safety in consideration of the possibility of leakage of waste material in the event of a strong impact such as an earthquake, and the long-term chemical change of harmful substances in units of 100 years It is considered that there is still room for improvement in such techniques despite the above-mentioned guidance standards.

On the other hand, regarding the final disposal of radioactive waste that is handled differently from general industrial waste, for example, as shown in FIG. This processing container 21 is stored in a concrete pit 20 cast and molded in a bare trench,
Generally, a mortar 22 is packed in the pit 20, a concrete lid 23 is placed from above, and the lid 23 is fixed using an adhesive 24. In this case, the mortar 22 filled in the pit 20 prevents the radionuclide from leaking outside, and also suppresses the movement of the processing vessel 21 to prevent a fall accident or the like (Japanese Utility Model Laid-Open No. 62-135999; FIG. 2).

FIG. 10 shows another example of such a radioactive waste pit. A cushion material 26 and a waterproof sheet 27 are provided on the inner wall surface of the pit 25, and a steel plate 28 is wound around the partition wall of the pit 25. Place steel plate 28 at appropriate location
(JP-A-2-253197).
Here, the steel plate 28 is a reinforcing member for preventing deformation of the pit 25 due to earth pressure.

[0007]

However, at present, the final treatment of general industrial waste is strongly economically restricted, and the work cost such as winding of a steel sheet as disclosed in the above-mentioned JP-A-2-253197 is high. Extremely high means of use cannot be used in practice. In the case of radioactive waste, it is possible to configure pits without regard to cost constraints.However, as for industrial waste, the burden on companies is in principle, so the pit configuration for final treatment also imposes cost constraints. I have to accept it.

[0008] From a technical point of view, in the treatment of radioactive waste in which mortar is packed in the pit, it is possible to put a cushioning material or a waterproof sheet on the inner wall of the pit, In the case of a cut-off type pit that dumps ash, there is no solid body to absorb vibration, so it is meaningless to provide a cushion material on the inner wall of the pit.

[0009] On the other hand, if a waterproof sheet is provided on the inner wall of the pit, solid matter may be mixed in the wastewater sludge or incinerated ash at any stage of the recovery, intermediate treatment, and final treatment. It is quite possible that the waterproof sheet is damaged and the waterproof function is impaired.

As a result of this situation, the conventional shut-off concrete pit has at most a technical structure of increasing the thickness of concrete defining the pit or providing a waterproof sheet on the inner wall of the pit on the assumption that no solid matter is mixed. Stayed at

However, at present, when problems such as environmental pollution and environmental destruction have permeated the general public awareness, concrete pits that can more efficiently finalize harmful substances under certain cost constraints and guarantee the safety thereafter. Is required.

Accordingly, an object of the present invention is to provide a shut-off concrete pit that can withstand shocks such as earthquakes and earth pressure for a very long period of time and that can prevent the leakage of harmful substances enclosed in the pit with a practical cost constraint. It can be realized within.

[0013]

The industrial waste pit according to the present invention, which achieves the above-mentioned objects and achieves the object, is based on the technical premise of a shut-off concrete pit for enclosing a highly hazardous waste in a dumping tank. An elastic material case formed by coating with a resin-based coating material was provided on the inner surface of the dump tank.

[0014]

In the pit according to the present invention, since an elastic material case formed by coating with a resin-based coating material is disposed on the inner surface of the dumping tank, a strong impact is applied to the ground around the pit and cracks are generated in the bulkhead concrete. Even so, the resin-coated elastic material case completely blocks leakage of harmful substances inside. Unlike the case where a waterproof sheet is applied to the inner wall of the pit, the elastic material case is protected by a resin-based coating material, so even if there is a mistake in the management at the time of disposal, such as dumping solids such as dry batteries, it will crack. No accidents such as damage or damage will occur.

Further, since the resin elastic material case is light in weight and easy to handle, unlike the steel plate used for the radioactive waste pit, the working cost can be reduced.
In addition, it is possible to integrally dispose a resin-based film material without a joint such as welding at a joint portion of a steel plate as disclosed in JP-A-2-253197, and it is possible to completely prevent leakage of harmful substances due to raindrops or the like. .

[0016]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 3 show an example of a processing pit according to the present invention, in which a crushed stone 30 is applied to a bottom floor of a landfill space excavated into a predetermined shape, and a discarded concrete 31 is placed thereon.
To form a foundation, and process pits 33 are formed on the foundation. Reference numeral Q denotes a U-shaped side groove for discharging rainwater or the like.

The processing pits 33 are formed by assembling a formwork on a foundation and casting concrete to form the pits.
A resin-coated elastic material case 40, and an elastic resin-based film material such as a natural rubber sheet 3 on the concrete wall.
6 is sandwiched.

The resin-coated elastic material case 40 is provided on each of the dump layers 34.
More specifically, for example, as shown in FIGS. 5 and 6, the elastic rubber 41 is sandwiched between two FRP panels 42, and the outer surface of the elastic rubber 41 is FR
It is covered with a P panel 42 and molded.

In general, the elastic rubber 41 is easily damaged by a hard substance. However, the elastic rubber 41 is not damaged by the coating with the FRP panel 42 and is chemically stable for a long time.
That is, the elastic rubber 41 is stable against almost all the substances contained in the pit, and the FRP is resistant to a strong impact.
The panel 42 exerts stress, and the resin-coated elastic material case 40 physically and chemically maintains the initial state for a long period of time. Further, since the resin-coated elastic material case 40 functions as a heat insulating material, the chemical stability of the substance contained therein is further ensured.

Next, the operation of the concrete pit will be described. The basic configuration of the processing pit 33 is designed so that even if an earthquake impact of about magnitude 10 is applied, the impact is absorbed by the presence of the natural rubber sheet 36 so that the concrete wall of each dump tank 34 does not crack. ing. Next, even if a further unexpected impact is applied and the concrete layer cracks, the natural rubber sheet 3
The presence of 6 completely prevents liquid leakage. Even if a crack occurs in a part of the natural rubber sheet 36 due to the tension of the concrete layer, the resin-coated elastic material case 4
0 completely prevents liquid leakage. This is because the FRP panel 42 exerts a stress equivalent to that of a metal against tension, and has excellent bending elastic stress itself.

As described above, the resin-coated elastic material case 40 is
It is not always necessary to arrange the natural rubber sheet 36 on the concrete layer because it is strong against impact and chemically stable.
Even if such a resin-coated elastic material case 40 is provided inside a simple concrete layer similar to a conventional pit, substantially the same effect can be obtained. In that case, the construction cost of the processing pit can be significantly reduced.

The pit in which the elastic material case entirely covered with the resin is formed is not limited to the final disposal pit. This is also an effective means for waste liquid storage pits that temporarily store various waste liquids that are difficult to dispose of at present. FIG.
Shows an example of such a waste liquid storage pit. The storage pit 60 is provided with an elastic material case 61 entirely covered and molded with resin inside the dumping tank, a natural rubber sheet 63 disposed thereon, and an upper concrete layer 64.
And seal the pit. Then, valve openings 65v, 66v of a waste liquid injecting pipe 65 and a waste liquid taking out pipe 66 are provided in a part of the upper concrete layer 64,
A roof 67 is provided in the openings 65v and 66v. The lower end of the take-out pipe 66 is arranged so as to reach the bottom of the elastic material case 62 entirely covered and molded with resin. Reference numeral 68 denotes a vibration stopper at the tip of the pipe. According to such a configuration, the operation of injecting and removing the waste liquid can be easily performed by the pipes 65 and 66 arranged in advance.

Since the storage pit 60 has a resin-coated elastic material case 61 on the inner surface of the dump tank, concrete erosion is not generated due to waste liquid despite the fact that the pit is easily formed at the time of placing concrete, and the storage pit 60 is stable for a long time. And the waste liquid can be stored. In addition, this storage pit 60
Since the pit is provided for a purpose different from that of the concrete block type pit based on the conventional administrative guidance, the material of the pit is not necessarily limited to concrete.

In the case where stricter strength conditions are required, an iron plate, a lead plate, a stainless steel plate or another metal panel is arranged around the pit, or a rigid panel such as FRP is arranged to reinforce the entire pit. May be. Alternatively, an iron plate, a lead plate, a stainless steel plate, or another metal panel may be disposed inside the elastic material case to reinforce the elastic material case. A metal case such as stainless steel can be arranged on the inner surface of the elastic material case 62 in relation to the waste liquid.

In the pit according to the present invention, the number of the dump tanks 34 is not limited. Dump tank 34 according to topography and environment of treatment plant
Can be increased or decreased as appropriate. The concrete thickness that defines the pit is 250 kg /
It is desirable that the material has a compressive strength of at least cm ² and a thickness of at least 15 cm. The shape, size, definition and configuration of the pits are also free.

The resin-based film material disposed inside the concrete layer exhibits a good elasticity with respect to the set thickness of the concrete.
In addition, any material can be used as long as it can block moisture (or gas) accompanying harmful substances, and is not necessarily limited to natural rubber. In the above embodiment, the FRP panel is used for coating the elastic material. However, means such as sticking and winding an FRP sheet, or spraying an FRP mixed spray may be used.

[0027]

As described above, the final disposal pit for industrial waste according to the present invention is provided with an elastic material case coated with a resin-based coating material on the inner surface of the dumping tank. Even if a strong impact is applied to the ground and cracks occur in the partition wall concrete, the elastic material case covered with the resin coating material completely blocks leakage of harmful substances inside. Further, since the resin-based coating material and the elastic material case are light in weight and easy to handle, the operation cost can be reduced. As a result, an insulated concrete pit that can withstand shocks such as earthquakes and earth pressure for a very long time and that can prevent leakage of harmful substances sealed in the pit can be realized with realistic cost constraints.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an example of a processing pit according to the present invention.

FIG. 2 is a plan view showing an example of a processing pit according to the present invention.

FIG. 3 is a front view showing a processing pit according to the present invention.

FIG. 4 is a partially enlarged view showing a processing pit according to the present invention.

FIG. 5 is a partially enlarged view showing a processing pit according to the present invention.

FIG. 6 is a diagram illustrating a case body according to the present invention.

FIG. 7 is a diagram showing another configuration example of the processing pit according to the present invention.

FIG. 8 is a diagram showing a general example of a shut-off type final disposal site for industrial waste.

FIG. 9 is a diagram showing another example of the shut-off type final disposal site for industrial waste.

FIG. 10 is a view showing another example of the shut-off type final disposal site for industrial waste.

[Explanation of symbols]

 33,60 treatment pit 34 dumping layer 36,63 natural rubber sheet 40,61 elastic case

Continuation of front page (56) References JP-A-2-25799 (JP, A) JP-A-49-65665 (JP, A) JP-A-63-194789 (JP, A) JP-A-51-6176 (JP, A) JP-A-60-31099 (JP, A) JP-A-5-154457 (JP, A) JP-A-60-87101 (JP, A) JP-A-62-82125 (JP, A) 1-2223399 (JP, A) Japanese Utility Model 1983-36297 (JP, U) Japanese Utility Model 3-123898 (JP, U) Japanese Utility Model 63-199100 (JP, U) (58) Field surveyed (Int. Cl. ^7, DB name) B09B 1/00 G21F 9/00

Claims (1)

(57) [Claims] 1. A highly hazardous waste, wherein an elastic material case entirely covered and molded with resin is disposed on an inner surface of the dumping tank in a shut-off concrete pit for storing the hazardous waste in the dumping tank. Industrial waste pit for disposal and storage of waste.