WO2013057813A1

WO2013057813A1 - Method for disposing of waste by displacement of deep-seated sea-bottom sediments via injection of waterproof (radioprotective) clay

Info

Publication number: WO2013057813A1
Application number: PCT/JP2011/074108
Authority: WO
Inventors: 一昭赤井
Original assignee: Akai Kazuaki
Priority date: 2011-10-20
Filing date: 2011-10-20
Publication date: 2013-04-25
Also published as: JP6078710B2; JPWO2013057813A1

Abstract

[Purpose] Waste disposal, particularly, radioactive waste disposal has become a grave social problem. In order to solve this problem appropriately for the purpose, "a method for disposing of waste by displacement of deep-seated bottom sediments" (JP3000193) was invented in 1999. The purpose of the present invention is to improve this technique and make use of the improved technique for solving the problem. [Problem] Faults, sand layers or gravel layers exist in deep-seated bottom sediments and form a groundwater artery. There is a risk that contaminated water resulting from the waste which has been disposed of by the displacement may pass through a stratum and/or the groundwater artery to cause groundwater contamination. [Solution] A method for disposing of waste by the displacement of deep-seated bottom sediments via the injection of a waterproof (radioprotective) clay, characterized by previously injecting a waterproof (radioprotective) clay into deep-seated bottom sediments before the injection of waste thereinto to thereby insulate the groundwater present in the deep-seated bottom sediments from the injected waste.

Description

Underfloor deep ground replacement treatment of waste injected with waterproof (radioactive protection) clay

TECHNICAL FIELD The present invention relates to a method of bottom sediment deep floor replacement treatment of wastes into which waterproof (radioactive protection) clay is injected.

Conventional wastes are used to partition the sea area with steel sheet piles, etc. for landfill disposal and to cover the surface, often leading to environmental damage such as leachate from rain water.
In the case of incineration disposal, environmental destruction such as air pollution by exhaust gas has occurred.
Furthermore, with conventional methods for waste disposal by landfill and incineration, the location of the disposal site is a major social problem, both in terms of cost and technology.
For this reason, in 1999, (JP 3000193) invented "the bottom sediment replacement method for wastes". This technology is a deep-seafloor indenting technology for waste, which inserts ceasing deep into the bottom and injects waste into the deep bottom of the bottom.
Patent publication 3000193

The deep ground in the seabed was not formed in a single morning, but was constructed over several thousands of years, and during this period there were various weather anomalies, and in the deep ground there were faults, sand layers and ridges. There are strata, which are underground water veins.
For this reason, the contaminated water of the waste material which has been treated by replacement to the bottom of the water floor may cause the groundwater to be polluted, for example, to flow out through the stratum or the underground water vein.
Furthermore, the same problem arises when radioactive waste is to be treated by the displacement treatment method deep in the water floor.

For this reason, in order to solve these problems, it is necessary to inject waterproof clay (in the case of radioactive waste, radioactively protected clay in the case of radioactive waste) and inject the waste into it before introducing waste in advance. Contaminated water and radiation from wastes are intended to prevent runoff into the deep underground. Furthermore, when treating radioactive waste, it is possible to protect the radioactivity of the radioactive waste by using a clay mineral having strong adsorptivity of radioactivity.

The waterproof clay is a gelled waterproof clay such as well-known bentonite and oily clay, and in particular, when treating radioactive waste, it is mainly composed of a known clay mineral such as montmorillonite which has high adsorptivity of radioactivity. Use waterproof clay.

The waste external pressure deeply inserted into the waterbed is uniform and stable storage structure.
(General waste)
The bottom of the bottom of the bottom is inserted with ceasing, and by the pre-inserted waterproof clay from the top of ceasing, it has the blocking effect of the fault of the deep mud layer and the underground water vein.
By the injection of waste, the waste deeply inserted into the bottom of the ground does not expose to the air, and has a storage effect to prevent scattering and odor.

(, Radioactively contaminated waste)
Furthermore, as for radioactively contaminated waste, as shown in Fig. 2 and Fig. 3, the radioactive contamination prevention effect of radioactively contaminated waste injected into the radiation-protected clay is deep under the water in the water. ) Protective effect by radioactive protective clay. (2) Effects of undergrounding deep under the water floor. (3) The radiation blocking effect of water is large, and the radioactive waste site stored in the deep underground is protected from the most robust neutron radiation.
Thus, radioactively contaminated waste has a multi-layered protection effect.

(Pre-processing of work start)
Insert the casing 1 deep into the bottom of the water floor where the waste is to be injected, and press in the waterproof (radioactive protection) clay in advance, and then inject the waste, so that the bottom of the water floor does not directly touch the waste. The bottom of the water floor is intended to treat waste.

(Process after completion)
After the bottom mud replacement process, waterproof (radioactive protection) clay is added, and the waste is sealed with waterproof (radioactive protection) clay.
Upon completion, after the bottom of the ceasing is sufficiently filled, the ceasing is pulled out.

(Preventing underground pollution of waste)
Before injecting waste into deep underground, waterproof (radioactive defense) clay is injected in advance, and ground water contamination of waste is prevented by blocking the injected waste and underground water of bottom mud layer.

With regard to radioactive waste, the use of a known clay mineral having high adsorptivity of radioactivity to the clay mineral of waterproof clay can enhance the activity blocking action.
(After completion)
After completion of the bottom mud replacement process, as shown in FIG. 3, the opening of the caisce is sealed with the bottom mud of 8 and a pipe reaching the waste under the bottom mud is installed and the installed pipe 7 is installed. Prevent the leachate by keeping the pressure in the waste below the water level.
Generally, the internal pressure is lowered by naturally releasing the gas generated from the waste through the pipe 7.

As shown in FIG. 1, the ceasing 1 is inserted deep into the bottom mud 2 and waterproof (radioactive protection) clay is introduced into a pump or hopper 5 shown in the figure and sufficiently injected into the underwater ground.
Thereafter, as shown in FIG. 2, when waste is injected into the caking, the waste 4 drops in the caking 1, and the pressure of the waste pushes out the bottom of the water floor (mud) and the bottom of the water bottom (mud) As in 2, waste and ground floor (mud) are deeply displaced.
When the waste injection is completed, waterproof (radioactive) clay is put in place of the waste, the filler material 8 is put in the bottom mud, etc., and the pressure is balanced to pull out the caking.
Occasionally, the degassing pipe 7 which reaches the waste injected deeply into the bottom of the water bed is inserted before and after this work, and the waste is managed in the state of FIG.

FIG. 1 is a cross-sectional view of a state in which waterproof (radioactive protection) clay is injected prior to the implementation of the bottom of the ground replacement treatment of waste. FIG. 2 is a cross-sectional view of the waste inserted into the underground deep ground, blocked by waterproof (radioactive protection) clay. FIG. 3 is a cross-sectional view after the end of the water bottom deep ground replacement treatment of waste with waterproof (radioactive protection) clay.

0 Water resistant (radioactive protection) clay 1 Casing 2 Water bottom 3 Water 4 Waste 5 Hopper-
6 Frout 7 Gas, drainage pipe 8 Spacer 9 Load capacity

Claims

In the “Bottom sediment replacement method for waste (JP3000193)”, in which caking is inserted deep into the bottom of the water and the waste is pressed into the deep sediment of the bottom (JP3000193), waterproofing ( Defense) A bottom layer soil replacement treatment method for waste infused with waterproof (radioactive defense) clay characterized by injecting clay and blocking the injected waste and deep ground.