JPH06102186B2 - Hazardous waste material reserve facility and method - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a burial facility and method for the disposal of hazardous industrial solid and liquid waste materials in the shallow ground.

[Prior Art] Conventionally, the method of disposing of this kind of waste material in the shallow ground is suitable for a flat and vast site because of the environmentally small amount of rainfall and no human living environment in the surrounding area. There is. In addition, this disposal method is implemented on the site where the groundwater level is low and the aeration layer is well developed due to geology.

The burial facility for this disposal creates a space surrounded by an artificial water-impervious layer such as an asphalt layer in the underground aeration layer, and stores harmful waste substances in this space. This buried facility will lose its water-blocking function of the artificial water-blocking layer in the distant future,
Toxic substances are absorbed and absorbed in the surrounding soil. As a result, the diffusion rate of harmful substances is delayed, and the harmful characteristics of the harmful substances are reduced during that period, thus preventing pollution of the human environment.

[Problems to be Solved by the Invention] The above-mentioned conventional burial methods are excellent methods when they meet the above-mentioned requirements in terms of environment and geology, but in a country that does not meet those requirements, for example, in Japan. If implemented, it may pollute the human environment.

In other words, in Japan, the flat area has a high population density, and therefore the reserve facility must be installed in the area where the hilly area was created. The characteristics of this area are as follows.

Due to the weather, there is a relatively large amount of rainfall.

Due to the slope of the land, the velocity of groundwater is high.

Groundwater is likely to come to the surface and become surface water.

The bedrock is well developed and almost no ventilation layer is obtained.

In order to obtain the stability of the embankment, it is necessary to actively drain the soil in the embankment part of the constructed land.

In view of the above, when the conventional method of reserves is implemented in Japan, if the water-blocking function is lost, there is almost no effect of delaying the diffusion rate of harmful substances into the soil, and pollution to the human environment is prevented. There is a problem that cannot be done.

INDUSTRIAL APPLICABILITY The present invention provides a facility and a facility capable of burying and safely disposing of harmful waste substances without polluting the human environment even when installed in a hilly area that is rich in rainfall and poorly ventilated. The purpose is to provide a burying method.

[Means for Solving Problems] A configuration of the present invention for achieving the above object will be described with reference to FIGS. 1 and 2 corresponding to the embodiment.

The first invention of the present application is to collect a water collecting basin 21 provided on the ground of a waste disposal site 10, a water conduit 15 deeply buried in the ground from a bottom portion 21a of the water collecting basin 21, and a collection of the water collecting basin 21. A first impermeable layer 22 surrounding the water outlet 21b and laid on the ground of the waste disposal site 10, and a first impermeable layer 22 that covers the upper surface of the impermeable layer 22 and fills the inside of the water collecting basin 21
A permeable layer 23 and a space 24 built inside the permeable layer 23
Concrete hollow water shield 24 having a and configured to store and seal harmful waste substances in this internal space 24a
And a second impermeable layer 25 encapsulating the entire hollow impermeable body 24 together with the first impermeable layer 23, and a second impermeable layer 26 encapsulating the second impermeable layer 25. It is a reserve facility.

Further, in the second invention of the present application, the water collecting basin 21 is provided on the ground of the waste disposal site 10, the water conduit 15 is deeply buried in the ground from the bottom 21a of the water collecting basin 21, and the first water blocking layer 22 is Water collecting port 21b of the water collecting basin 21
Is laid on the ground of the waste disposal site 10 so as to surround the
23 is coated on the upper surface of the impermeable layer 22 and the water collecting basin
It is filled in 21 and is provided with a space 24 on the inside of this permeable layer 23.
After constructing a concrete hollow water shield 24 having a, and storing and sealing harmful waste substances in the internal space 24a of the hollow water shield 24, the entire hollow water shield 24 is entirely covered with the first permeable layer.
The second permeable layer 25 is encapsulated with the second permeable layer 25 together with 23.
This is a method of burying harmful waste substances by encapsulating 25 with the second impermeable layer 26.

[Operation] Even if water arrives around the concrete water shield 24,
The water flows into the water collecting basin 21 due to the existence of the first and second permeable layers 23 and 25 and the first impermeable layer 22. Therefore, even if the hollow water shield 24 is cracked, water does not easily enter the inside 24a of the hollow water shield 24. In the unlikely event that water enters the inside 24a of the hollow water shield 24 and the waste liquid leaks out of the hollow water shield 24,
Similarly to the above, the waste liquid flows into the water collecting tank 21. Since the waste liquid permeates deep into the ground from the water collecting tank 21 through the water conduit 15, the underground diffusion speed of harmful substances is delayed and the harmful substances are safely disposed.

[Examples] Next, examples of the present invention will be described in detail. Here, an explanation will be given by taking as an example a reserve facility for hazardous industrial waste contaminated with organic mercury, hexavalent chromium, cadmium and the like.

As shown in FIGS. 1 and 2, a waste disposal site 10 for harmful industrial wastes contaminated with organic mercury, hexavalent chromium, cadmium, etc. is formed by forming a part of a hilly area 11. A plurality of buried facilities 20, 40, 60 are installed in this disposal site 10. 12 is the human living environment area, and 13 is the standard level.

A description will be given on behalf of the reserve facility 20 provided in one area of the disposal site 10. In this facility 20, a catchment basin 21 is provided on the bedrock 14 of the treatment plant 10. The water conduit 15 penetrates the bedrock 14 from the bottom 21a of the water collecting basin 21 and is deeply buried in the ground. This catchment 21
Is composed of a watertight concrete structure with reinforcing bars and is provided on the mountain side of a hilly area 11 away from the human living environment 12. The lower end 15a of the water conduit 15 is open, and the reference level 13
It extends deeper underground (Fig. 2). The depth of burial of this water conduit 15 in the ground is determined by the contaminated waste liquid of the waste substance described later.
Even if it diffuses from the lower end 15a of the water conduit 15 to the underground, it has a sufficient depth that the harmfulness of the waste material is diffused and attenuated before it appears on the surface of the earth so that it is harmless to humans and animals.

On the bedrock 14, the first is provided so as to surround the water collecting port 21b of the water collecting basin 21.
The impermeable layer 22 is laid. This impermeable layer 22 is made of a watertight concrete structure containing reinforcing bars, and in this example, a slope is provided toward the water collecting port 21b of the water collecting tank 21. The upper surface of the water shield layer 22 is covered with a first water permeable layer 23. The water permeable layer 23 is also filled inside the water collecting tank 21. The permeable layer 23 is formed by paving stones.

On the water permeable layer 23, a hollow concrete water shield 24 is constructed. The hollow water shield 24 is made of a watertight concrete structure containing reinforcing bars. A waste disposal space 24a is formed inside the hollow water shield 24. The hollow water shield 24 can be sealed after storing a waste substance (not shown) in the waste disposal space 24a. This waste material may be solid or liquid. The outer surface 24b of the top of the hollow water shield 24
Is provided with a slope so that water does not collect on the outer surface 24b. In this example, it is inclined toward the water collecting basin 21. After the waste substance is stored and sealed in the inner space 24a of the hollow water shield 24, the second water permeable layer 25 is provided around it. The water permeable layer 25 is made of the same stone as the water permeable layer 23. As a result, the hollow water shield 24 is covered with the water permeable layers 23 and 25. The water permeable layer 25 is covered with a second water impermeable layer 26 made of a material having a high water impermeability such as clay.

Soil is piled up on the outer periphery of the second impermeable layer 26 and the first impermeable layer 22. A pavement 28 is laid in the entire buried facility 20 including the upper part of the embankment 27. A side groove 29 is bored at the edge of the embankment 27 on the mountain side, and a drain pipe 30 is provided at the bottom thereof. In addition, drainage holes 31 are provided at intervals on the valley-side slope of the embankment 27, and a side groove 32 is provided at the lower end of the slope. Further, a detection pipe 33 whose tip reaches the water collecting port 21b of the water collecting tank 21 is provided so as to penetrate the pave pent 28, the embankment 27, the second water blocking layer 26, and the second water permeable layer 25. The detection pipe 33 is used to know the presence or absence of water at the water collection port 21b from the outside of the buried facility 20.

The situation of waste disposal in the buried facility having such a configuration will be described.

As shown by the arrow A in FIGS. 1 and 2, the rain that has fallen on the hilly area 11 is drained from the surface of the pavement 28 to the drain 28 of the gutter 28.
It flows along the slopes of 30 and the embankment 27 and flows into the gutter 32 for drainage. Most of the water that has permeated the embankment 27 and the bedrock 14 flows out of the drainage hole 31 into the gutter 32 due to the impermeable layer 26 and the like.

As shown by the arrow B in FIG. 1, when the amount of rainfall is large,
When the water penetrates the hollow impermeable body 24 through the impermeable layer 26, the water is gravity settled on the hollow impermeable body 24 and the impermeable layer 22 by the impermeable layers 25 and 23. Hollow impermeable body 24 and impermeable layer 22
Since there is a gradient in the water, the water accumulated on these is collected in the water collecting tank 21. The water level is controlled by the detection pipe 33, and when it is confirmed that water has entered from the outside, the pavement 28, the gutter 29, or the drain pipe 30 is repaired to cut off the water inflow route. As a result, the waste substances stored in the hollow water shield 24 are protected from flooding.

The characteristic feature of the present invention is that, as shown by the arrow C in FIG. 1, the hollow water shield 24 is cracked, the inside 24a penetrates into the water, and the waste liquid leaks out of the hollow water shield 24. This is the disposal method when you do. Also in this case, the permeable layer 23
And the impermeable layer 22 causes the waste liquid to flow into the collecting basin 21. Water catchment 21
The waste liquid that has flowed into the pipe passes through the water conduit 15 and permeates underground from the lower end 15a thereof. As shown by the arrow D in FIG. 2, the water conduit 15
Even if the waste liquid that has penetrated underground from the lower end 15a of the above reaches the living environment area 12 of human beings, the harmfulness thereof is attenuated and thus becomes harmless to human livestock.

In addition, in the above example, an example of harmful industrial waste contaminated with organic mercury, hexavalent chromium, cadmium, etc. was shown as a harmful waste, but the present invention is not limited to this, and since radioactive waste is disposed of, It can also be applied to the burial of.

[Effects of the Invention] As described above, according to the present invention, even if the internal space of the hollow concrete water shield body is inundated and the stored waste liquid of hazardous waste leaks from the hollow water shield body. Since it diffuses deeply into the ground with a water conduit, it does not pollute the living environment of human beings, even if it is a country with abundant rainfall like in Japan and a poorly ventilated hilly area. It has an excellent effect that it can be disposed of.

[Brief description of drawings]

FIG. 1 is a sectional view of a buried facility according to an embodiment of the present invention. Figure 2 is a schematic diagram showing the location of the disposal site. 10: Waste disposal site, 15: Water pipe, 20, 40, 60: Reserve facility, 21: Water collecting basin, 21a: Bottom of water collecting port, 21b: Water collecting port, 22: First impermeable layer, 23: First Permeable layer, 24: hollow concrete water shield, 24
a: internal space, 25: second permeable layer, 26: second impermeable layer.

Claims (5)

[Claims] 1. A water collecting basin provided on the ground of a waste disposal site,
A water conduit deeply buried in the ground from the bottom of this catchment basin,
A first impermeable layer surrounding the water collecting port of the water collecting basin and laid on the ground of the waste disposal site; and a first water permeable layer covering the upper surface of the water impermeable layer and filling the inside of the water collecting basin. The hollow concrete impervious body constructed on the water-permeable layer and having a space inside so that harmful waste substances can be stored and sealed in the inner space, and the hollow impermeable body as a whole are A facility for burying harmful waste substances, comprising a second permeable layer encapsulating with the permeable layer and a second impermeable layer encapsulating the second permeable layer. 2. The harmful substance according to claim 1, wherein the first impermeable layer is provided with a gradient so that the water permeating through the first and second permeable layers concentrates and flows into the catchment basin. Burial facility for various waste materials. 3. The toxic waste substance burial facility according to claim 1 or 2, wherein a gradient is provided on the outer surface of the top of the hollow concrete water shield to prevent water from accumulating. 4. The depth of burial of a water pipe in the ground is sufficient to delay the diffusion rate of harmful waste substances into the ground and reduce the harmful properties of the substances. First
The burial facility for hazardous waste substances described in paragraphs 3 to 3. 5. A water collecting basin is provided on the ground of the waste disposal site, and a water pipe is deeply buried in the ground from the bottom of the water collecting basin so that the first impermeable layer surrounds the water collecting port of the water collecting basin. Is laid on the ground of the waste disposal site, and the first water-permeable layer is provided on the upper surface of the water-blocking layer and is filled in the catchment basin, and is made of concrete having a space inside the water-permeable layer. After constructing a hollow impermeable body, storing and sealing harmful waste substances in the inner space of the hollow impermeable body, the entire hollow impermeable body is encapsulated by the second impermeable layer together with the first impermeable layer. 2 A method of burying harmful waste substances by encapsulating the impermeable layer with a second impermeable layer.