JP6589182B2 - Waste disposal method - Google Patents

Description

The present invention relates to a waste treatment method for treating waste such as contaminated soil, concrete waste, and vegetation, and treating the waste by carbonizing and pulverizing the waste and pouring the mixed product into the seabed. The present invention relates to a waste disposal method .

  It is well known that a lot of various types of waste represented by concrete waste generated during road renovation and the demolition of buildings, etc. are discharged and it is a social problem, and many proposals for solving it have been made.

  Although recycling methods have been established for concrete waste materials that are mainly pulverized to take out aggregates and use them as recycled aggregates, it is difficult to recycle all of the large amounts of concrete waste materials that are generated during the recent rebuilding and demolition of buildings. And some concrete waste materials are landfilled at the disposal site.

  However, the disposal sites in all parts of the country are already full and there are only a few remaining years of use. In addition to new construction, expansion and renovation are currently difficult due to opposition from local residents and rising land. is there.

  In addition, as with the above, it is difficult to dispose of contaminated soil and concrete waste generated from the decontamination work in the radioactively contaminated area caused by the accident at the Fukushima Daiichi Nuclear Power Station in 2011. This contaminated soil and concrete waste material is currently stored in large quantities in the form of piles in flexible storage packs (large sandbag bags) and is still piled up in intermediate storage facilities. Is not established.

  Therefore, in Patent Document 1, it is possible to prevent adverse effects on the environment by drawing radioactively contaminated waste under the continental plate using the phenomenon of movement of the oceanic plate in the sea. A possible method is disclosed.

JP 2014-62881 A

  However, since the ocean plate sinks only about several centimeters a year and it is unclear whether radioactive waste is properly drawn in, it is difficult to realize the invention described in Patent Document 1.

The present invention has been made in view of such problems, and an object of the present invention is to provide a waste treatment method in which contaminated soil or concrete waste to be treated as waste is easily processed and poured into the deep sea for treatment. .

In order to solve the above problems, the present invention is a waste treatment method for treating waste containing contaminated soil, concrete waste, and vegetation, wherein the contaminated soil, concrete waste, and vegetation contained in the waste The contaminated soil is sorted by particle size, the concrete waste material is pulverized, the vegetation is heated and carbonized to produce powdered carbides, and the contaminated soil and pulverized The concrete waste material, the powdered carbide, and seawater are mixed to produce a slurry-like landfill material, and a plurality of pipes are connected on the sea surface by a ship to form a pipeline. The slurry is settled on the seabed, and the slurry-like landfill material is poured into the pipeline extending to a deep sea of 5000 m or more and is pumped using a hydraulic piston cylinder.

  According to the present invention, concrete waste generated at the time of civil engineering work or building demolition, and contaminated soil and vegetation generated by soil restoration work in a contaminated area are subjected to pulverization treatment and carbide treatment, and the obtained earth and sand or powder form is obtained. By mixing the carbide and seawater to produce a slurry-like landfill material, it becomes possible to dispose of the slurry-like landfill material by pumping the slurry-like landfill material through a pipeline extending to the deep sea.

  For example, even if it is soil, concrete waste, and vegetation contaminated with heavy metals or radioactivity, the deep sea with a water pressure of 500 tons and a depth of 5000 m or more is a vast area, and a vast dish-like landform called a basin. Because the flow is very small, you can stay in the deep sea without going up to the sea level. For this reason, the load on the environment can be minimized.

It is the schematic which shows the structure of the waste disposal system which concerns on this embodiment. It is the figure which showed the structure of the carbonization and grinding plant. It is the figure which showed the structure of the landfill material pumping plant. FIG. 4A is a front view showing the configuration of the weight, and FIG. 4B is a side view showing the configuration of the weight. It is a flowchart explaining the flow about the method of a waste treatment.

Next, a waste treatment system and a disposal method according to the present embodiment will be described with reference to the drawings.
FIG. 1 is a schematic diagram illustrating a configuration of a waste treatment system according to the present embodiment.
As shown in FIG. 1, the waste treatment system 1 carbonizes or pulverizes waste conveyed to a dike 2 constructed on the ocean in advance, and mixes the treated ones to form a slurry-like landfill material. The waste is processed by generating and flowing into the deep sea.

  A carbonization / grinding plant 10 and a landfill material feeding plant 20 are constructed on the bank 2. The waste shown in the present embodiment includes soil and concrete waste generated at the time of building construction and demolition, and contaminated soil, stone blocks, and vegetation generated at the time of restoration of land due to soil contamination.

  These precon packs containing the waste are transported to the embankment 2 by the ship 100, and first, the waste is carbonized or pulverized in the carbonization / pulverization plant 10. Then, the waste having undergone these treatments is mixed by the landfill material pumping plant 20 to produce a slurry-like landfill material 40, and the landfill material 40 is pumped to a depth of 5000 m or more, which is deep sea, by a pipeline 30 extending to the seabed. To do.

  In addition, when the precon packs loaded in large quantities are more than the waste processing capacity of the present processing system, the precon packs are stored in a stock yard (not shown) for stocking the precon packs by a transport vehicle. Then, after the ship 100 departs from the port, the precom pack is carried into the processing plant from this stock yard.

<Carbonization and grinding plant 10>
FIG. 2 is a diagram showing the configuration of the carbonization / pulverization plant.
As shown in FIG. 2, the carbonization / pulverization plant 10 is for pulverizing a sieve 11 that sorts the transported waste, a carbonization treatment plant 12 that carbonizes vegetation, and contaminated soil, stone blocks, and concrete waste materials. Crushing plant 13, coarse-grained sand stock yard 14 for stocking coarse-grained sand, fine-grained sand stock yard 15 for stocking fine-grained sand, and belt conveyor 16 for transporting waste to various places And hoppers 17a to 17d installed in various places.

  The sieving machine 11 is a general sieving machine, and sorts waste transported by the ship 100 into contaminated soil, stone blocks, concrete waste, and vegetation. These wastes are put into the hopper 17a installed on the embankment 2 from the ship 100 and are carried to the sieve machine 11 by the belt conveyor 16.

  The sieving machine 11 sorts contaminated soil, stone blocks, concrete waste and vegetation from the transported waste. The coarse-grained soil having a particle size of about 50 to 100 mm selected by the sieving machine 11 is conveyed to the coarse-grained sediment stock yard 14 by the belt conveyor 16.

  Further, the fine-grained earth and sand having a particle size of about 1 to 50 mm selected by the sieving machine 11 is conveyed to the fine-grained earth and sand stock yard 15 by the belt conveyor 16. Furthermore, stone blocks and concrete wastes having a relatively large particle size are conveyed to the pulverization plant 13 by the belt conveyor 16.

  The lump of stone and concrete waste conveyed to the pulverization plant 13 are pulverized to an appropriate size by a pulverizer 13 a included in the pulverization plant 13, transported again to the sieve machine 11 by the belt conveyor 16, and sorted by the sieve machine 11. I do.

  Further, the vegetation selected by the sieving machine 11 is conveyed to the carbonization plant 12 by the belt conveyor 16. The carbonization plant 12 includes a heating furnace 12a for heating plants and generating carbides, a pulverizer 12b for converting the generated carbides into powder, and a carbide stock yard 12c for storing powdered carbides. It is composed of

  The heating furnace 12a is a heating furnace that operates by an electric type, a gas type, or a liquid fuel type, and heats the introduced vegetation at a temperature of 700 to 900 ° C. to perform carbonization. The carbonized carbide is pulverized by a pulverizer 12b and stocked in a carbide stock yard 12c.

  Then, the powdered carbide is put into the hopper 17b from the carbide stock yard 12c, the coarse-grained sand is thrown into the hopper 17c from the coarse-grained sand stock yard 15, and the fine-grained sand is thrown into the fine-grained sand stock yard 17d. Each is transported to the landfill material feeding plant 20 by the belt conveyor 16.

<Landfill material pumping plant 20>
FIG. 3 is a diagram showing a configuration of the landfill material pumping plant 20.
As shown in FIG. 3, the landfill material pumping plant 20 includes a fine-grained earth and sand hopper 21, a coarse-grained earth and sand hopper 22, a carbide hopper 23, measuring instruments 21 a to 23 a, a seawater tank 24, and a mixer 25. It consists of and.

  The coarse grained sand, fine grained sand and powdered carbides carried by the belt conveyor 16 are put into the respective hoppers 21 to 23. And each earth and sand and carbide | carbonized_material are weighed by the measuring instruments 21a-23a, and are thrown into the mixer 25. FIG.

  At this time, an appropriate amount of seawater is injected from the seawater tank 24 into the mixer 25. The mixer 25 kneads the input coarse grained sand, fine grained sand, powdered carbide and seawater to produce a slurry-like landfill material. Then, the generated slurry-like landfill material is sent from the mixer 25 to the pipeline 30 connected to the lower portion of the mixer 25.

<Pipeline 30>
As shown in FIG. 1, the pipeline 30 is configured by connecting a plurality of pipes 31 on the sea surface by a ship 200. In order to reach the tip of the pipeline 30 to a depth of about 5000 m at the seabed, the total length of the pipeline 30 is required to be about 7400 m, and a plurality of pipes 31 are connected so as to have this length.
It should be noted that the total length of the pipeline 30 can be changed depending on how deep the tip of the pipeline 30 is reached.

  A weight 32 is attached to the front end of the pipeline 30, and a hydraulic piston cylinder 35 is provided at the rear end. After the plurality of pipes 31 are connected, seawater is injected into the pipeline 30 by the onboard operation, the air is extracted, and the weight 31 is lowered to the seabed.

  A wire 33 moored to the buoy 34 is attached to the weight 32, and when the pipeline 30 sinks to the seabed, the buoy 34 floats on the sea surface, and the wire 33 is in an extended state. By attaching the wire 33, the pipeline 33 can be repaired by winding the wire 33 when the pipeline 30 fails.

4A is a front view showing the configuration of the weight, and FIG. 4B is a side view showing the configuration of the weight.
As shown in FIG. 4, the weight 32 includes a pipe portion 32a having the same shape as the pipe 31, a leg portion 32b extending downward from the column 32a, an anchoring hole 32c provided at the upper portion of the pipe portion 32a, and an anchoring hole 32c. The camera 32d is provided in the vicinity. The legs 32b have a height of about 4 to 6 m so that the pipeline 30 does not contact the seabed. It is also possible to provide a similar leg portion 32b in a part of the pipeline 30.

  A plurality of concrete blocks 40 are arranged between the leg portions 32b and the weight of the weight 32 main body is increased, so that the original function of the weight can be achieved. The mooring hole 32c can moor the wire 33 described above.

  The camera 32d photographs the discharge state of the slurry-like landfill material discharged from the tip of the pipe portion 32a of the weight 32. The camera 32d is connected to a cable 32e for power supply and communication, and the cable 32e extends along the pipeline 30 to a management facility (not shown) installed on the bank 2. . Then, the discharge state of the slurry-like landfill taken by the camera 32d can be seen at the management facility.

Next, the waste disposal method will be described with reference to FIG.
FIG. 5 is a flowchart for explaining the flow of the waste treatment method.
First, the ship 100 transports waste to the embankment 2 (step S1). For example, the waste is put in a sandbag, and only the waste is put into the hopper 4 installed on the bank 2 from the sandbag.

Next, the waste thrown into the hopper 4 is conveyed to the carbonization / pulverization plant 10 by the belt conveyor 3, and the waste is sorted (step S2).
In the carbonization / pulverization plant 10, a sieve 11 sorts contaminated soil, stone blocks, concrete waste, and vegetation, which are wastes, according to size and type. Of the contaminated soil, stone blocks, and concrete waste materials, the contaminated soil, stone blocks, and concrete waste materials selected as coarse sand particles (particle size is about 50 to 100 mm) are transported to the coarse soil sand stock yard 14 and fine soil particles ( Contaminated soil, stone blocks, and concrete waste materials having a particle size of about 1 to 50 mm are transported to the fine-grained soil stock yard 15.

In addition, the stone block and the concrete waste having a relatively large particle size are conveyed to the pulverizer 17 and pulverized to a predetermined size, and again sorted by size by the sieving machine 11.
Further, the vegetation selected by the sieving machine 11 is transported to the carbonization plant 12.

The vegetation carried to the carbonization plant 12 is processed into carbide by the heating furnace 12a, and processed into powdered carbide by the crusher 12b (step S3).
Next, the coarse-grained earth and sand, fine-grained earth and sand, and the powdered carbide are each conveyed to the landfill material pressure-feeding plant 20 by the belt conveyor 3 to generate the landfill material (step S4).

  In the landfill material pumping plant 20, seawater is mixed into the coarse-grained earth sand, fine-grain earth sand, and powdered carbides, and kneaded to produce a slurry-like landfill material. Coarse-grained earth and sand, fine-grained earth and sand, powdered carbides, and seawater are kneaded by a mixer 25 by measuring appropriate amounts, and a slurry-like landfill material is generated.

  Slurry landfill material has high viscosity and fluidity so that it does not dissolve in seawater even when it is poured into the deep sea, and the viscosity is such that fine particles contained in the landfill material are not generated in the seawater as suspended matter. Have. It is poured into a pipeline 30 connected to the lower part of the mixer 25. The slurry-like landfill material poured into the pipeline 30 is pushed by a hydraulic piston cylinder 35 provided at the rear end of the pipeline 30 and passes through the pipeline 30 and has a water pressure of 500 tons above the seabed of about 5000 m. Pour to depth (step S5).

  The slurry-like landfill material poured into the seabed flows into the vicinity of the depth of about 5800 m along the seabed without staying near the tip of the pipeline 30 (depth of about 5000 m), and is deposited on the spot.

  Thus, in this embodiment, soil and concrete waste generated during construction or demolition of buildings, contaminated soil, stone blocks, vegetation, etc. generated during restoration of contaminated land are processed into slurry-like landfill materials to expand It flows into the deep sea (depth of about 5800m) with a large area and water pressure of 500 tons. In the deep sea, the flow is very small, so the slurry-like landfill material can stay in place for a long time without flowing, and the slurry-like landfill material has viscosity, so it dissolves in seawater, It is possible to prevent fine particles and the like contained in the landfill material from floating in seawater, and it is possible to treat waste with a minimum environmental load.

DESCRIPTION OF SYMBOLS 1 Waste disposal system 2 Embankment 3 Belt conveyor 4 Hopper 10 Carbonization and crushing plant 20 Landfill material pumping plant 30 Pipeline

Claims (1)

A waste treatment method for treating waste containing contaminated soil, concrete waste, and vegetation,
The contaminated soil contained in the waste, the concrete waste, and the vegetation are sorted by type,
The contaminated soil is sorted by particle size,
The concrete waste material is pulverized,
The plant is heated and carbonized to produce powdered carbide,
Kneading the contaminated soil, the crushed concrete waste material, the powdered carbide, and seawater to produce a slurry-like landfill material,
After connecting a plurality of pipes on the sea surface with a ship to form a pipeline, sink the pipeline to the sea floor,
A waste disposal method, wherein the slurry-like landfill material is poured into the pipeline extending to a deep sea of 5000 m or more and pumped using a hydraulic piston cylinder.

Images