JP3641816B2 - Method and apparatus for quality control of bentonite mixed soil - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to quality control of bentonite mixed soil.
[0002]
[Prior art]
Liners using bentonite mixed soil have been applied to prevent leakage of hazardous substances from waste disposal sites and soil-contaminated sites and to form a water barrier. In order for the performance of the liner to be fully exerted, bentonite needs to be mixed uniformly. However, it was not possible to judge from the appearance whether or not it was uniformly mixed. Samples were collected as closely as possible from the target location, the content of bentonite was measured, and the content distribution was judged. . However, this measurement is very expensive and time consuming, and is not suitable for quick management on site.
[0003]
[Problems to be solved by the invention]
It is an object of the present invention to easily manage the mixed state of bentonite mixed soil.
[0004]
[Means for Solving the Problems]
In the quality control method of bentonite mixed soil formed by mixing bentonite and earth and sand, the present invention generates fluorescence by ultraviolet irradiation under reducing conditions, and deposits a test solution that does not generate fluorescence under oxidizing conditions on bentonite mixed soil, Irradiating the bentonite mixed soil with ultraviolet light, knowing the mixed state of the bentonite mixed soil from the fluorescence generation status of the bentonite mixed soil, or the quality control method of bentonite mixed soil, or
In the quality control method of the bentonite mixed soil, the test solution is sprayed on the surface of the bentonite mixed soil, and the surface of the bentonite mixed soil is photographed, or the quality control method of the bentonite mixed soil, or
In a bentonite mixed soil quality control device consisting of bentonite and earth and sand, a container that contains bentonite mixed soil and a sprayer that sprays a test solution that emits fluorescence under ultraviolet irradiation under reducing conditions and does not generate fluorescence under oxidizing conditions And an ultraviolet irradiation device for irradiating ultraviolet rays inside the container, irradiating the bentonite mixed soil sprayed with the test solution with ultraviolet light, and obtaining a mixed state of the bentonite mixed soil from the fluorescence generation state of the bentonite mixed soil A bentonite mixed soil quality control device, or
In the bentonite mixed soil quality control device, a bentonite mixed soil quality control device, characterized in that a mesh-like partition frame is formed on the bottom plate of the container, or
In the bentonite mixed soil quality control device, the bentonite mixed soil quality control device includes a photographing device for photographing the bentonite mixed soil accommodated in the container.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0006]
<I> Outline of quality control of bentonite mixed soil A test solution that generates fluorescence by irradiation with ultraviolet rays under reducing conditions and does not generate fluorescence under oxidizing conditions is sprayed onto bentonite mixed soil in which bentonite and earth and sand are mixed. When the bentonite mixed soil is observed under ultraviolet irradiation, the portion containing bentonite is oxidized and does not emit fluorescence, and the portion not containing bentonite is not oxidized and emits fluorescence. By observing this phenomenon, it is possible to easily know the mixed state of bentonite.
[0007]
<B> Test solution The test solution is a solution having the property of generating fluorescence by ultraviolet irradiation under reducing conditions and not generating fluorescence under oxidizing conditions. There are various types of solutions, and examples include safranin / ethyl alcohol solution, rhodamine B / ethyl alcohol solution, or acriflavine / ethyl alcohol solution. For example, these concentrations are 0.1% safranin / ethyl alcohol solution. An ethyl alcohol solution, or a 0.2% rhodamine B / ethyl alcohol solution, or a 0.5% acriflavine / ethyl alcohol solution can be used.
[0008]
<C> Quality Control Device The quality control device 1 has, for example, a container for containing bentonite mixed soil as shown in FIG. 1, and an ultraviolet irradiation device such as an ultraviolet lamp 2 is used to irradiate the bentonite mixed soil with ultraviolet rays. I have. When the container is a rectangular parallelepiped, four ultraviolet lamps 2 are arranged at the four corners in the upper periphery or on the upper diagonal so that the ultraviolet rays are irradiated as uniformly as possible on the bottom surface. For example, a wavelength near 254 nm can be used as the ultraviolet ray.
[0009]
Since the container is for observing fluorescence from the bentonite mixed soil, it is desirable that the container has a dark room structure that blocks incoming light from the outside. In order to observe the bentonite mixed soil, it is preferable that the state of fluorescence from the bentonite mixed soil can be photographed by placing the camera 3 on the upper side in addition to the naked eye. In order to facilitate observation, an openable / closable observation window is provided, and the window is opened and observed with the naked eye, or the window is closed and photographed with the camera 3.
[0010]
A mesh frame 4 is provided at the bottom of the container. By using this frame, the ratio of the area that emits light and the position and distribution status of the area that emits light can be easily grasped, and can be quantified in image processing or the like.
[0011]
The quality control device 1 includes a spraying device that sprays a test solution onto bentonite mixed soil. The spraying device does not need to be attached to the container, and may be any device that can spray the test solution onto the bentonite mixed soil.
[0012]
Examples of the present invention will be described below.
[0013]
<A> A safranine / ethyl alcohol solution having a uniformly mixed bentonite mixed soil concentration of 0.1% is sprayed on the bentonite mixed soil uniformly mixed with a bentonite amount of 5% and irradiated with ultraviolet rays in a dark room container. FIG. 2 shows the state (colored state) of the presence or absence of fluorescence in the bentonite mixed soil. As a whole, bentonite portion 5 was formed, dark blue (black in the drawing), and yellow-orange fluorescence (white in the drawing) were not observed.
[0014]
The inspection range of bentonite mixed soil is divided into 5 (A to E) sections and 10 (1 to 10) sections (1 section is 5 × 5 cm), and the bentonite content is measured for each section. A value of 4.72%, a maximum value of 5.55%, an average value of 5.07%, and a standard deviation of 0.23% were determined. As a result, the distribution of bentonite was uniform, and the same results as observed were obtained.
[0015]
<B> Using the same test solution as in the case of evenly mixed bentonite mixed soil, spray it onto the bentonite mixed soil mixed slightly uniformly, and irradiate ultraviolet rays in a dark room container.
[0016]
As shown in FIG. 3, in the colored state, the portion not containing bentonite (sand portion 6) is yellow-orange (white in the drawing), and the bentonite portion 5 containing bentonite is dark blue (black in the drawing). .
[0017]
The inspection range of the bentonite mixed soil is the same as the uniform case, the bentonite content is measured for each section, the minimum value is 0.80%, the maximum value is 16.70%, the average value is 4.58%, and the standard A deviation of 3.25% was determined. As a result, the distribution of bentonite was somewhat uniform, and the same results as observed were obtained.
[0018]
<C> Using the same test solution as in the case of non-uniformly mixed bentonite mixed soil, spray the non-uniformly mixed bentonite mixed soil and irradiate ultraviolet rays in a dark room container.
[0019]
As shown in FIG. 4, in the colored state, the portion not containing bentonite (sand portion 6) is yellow-orange (white in the drawing), and the bentonite portion 5 containing bentonite is a large dark blue (black in the drawing). Present.
[0020]
The inspection range of the bentonite mixed soil is the same as the uniform case, the bentonite content is measured for each section, the minimum value is 0.00%, the maximum value is 14.30%, the average value is 3.80%, and the standard A deviation of 3.99% was determined. As a result, the distribution of bentonite was non-uniform, and the same result as observed was obtained.
[0021]
<D> Quality control method The uniformity of bentonite mixed soil is judged from the visual observation result and the photographed image of the color development state of fluorescence. If the entire field of view is black, it is judged to be uniform, and construction of the next construction part is started. If a yellow-orange part is seen in the field of view in black, it is judged as non-uniform, and the bentonite mixed soil at the target location is removed, and the construction is performed again. This operation is repeated to construct a high-quality bentonite mixed soil in which bentonite is uniformly mixed.
[0022]
【The invention's effect】
The present invention can obtain the following effects.
<A> By using the test solution, the mixed state of the bentonite mixed soil can be easily checked. .
<B> While creating the bentonite mixed soil, the quality of the bentonite mixed soil can be quickly confirmed as necessary.
<C> If the quality is poor, it can be immediately recreated and a good quality bentonite mixed soil can be created.
[Brief description of the drawings]
[Fig. 1] External view of quality control device [Fig. 2] Surface view of uniform bentonite mixed soil [Fig. 3] Surface view of slightly non-uniform bentonite mixed soil [Fig. 4] Surface view of non-uniform bentonite mixed soil [ Explanation of symbols]
1. Quality control device 2. UV lamp 3. Camera 4. Mesh frame 5. Bentonite part 6. Sand part

Claims (5)

In the quality control method of bentonite mixed soil consisting of bentonite and earth and sand,
Fluorescence is generated by ultraviolet irradiation under reducing conditions, and a test solution that does not generate fluorescence under oxidizing conditions is deposited on bentonite mixed soil,
Irradiate the bentonite mixed soil with ultraviolet rays,
It is characterized by knowing the mixing state of bentonite mixed soil from the fluorescence generation status of bentonite mixed soil,
Quality control method for bentonite mixed soil. In the quality control method of bentonite mixed soil according to claim 1,
Spray the inspection solution onto the surface of bentonite mixed soil,
It is characterized by photographing the surface of bentonite mixed soil,
Quality control method for bentonite mixed soil. In the bentonite mixed soil quality control device, which is a mixture of bentonite and earth and sand,
A container containing bentonite mixed soil;
A sprayer that sprays a test solution that generates fluorescence by irradiation with ultraviolet rays under reducing conditions and does not generate fluorescence under oxidizing conditions;
An ultraviolet irradiation device for irradiating ultraviolet rays inside the container;
The bentonite mixed soil sprayed with the test solution is irradiated with ultraviolet light, and the mixed state of the bentonite mixed soil can be obtained from the fluorescence generation state of the bentonite mixed soil,
Bentonite mixed soil quality control equipment. In the bentonite mixed soil quality control device according to claim 3,
A mesh-shaped partition frame is formed on the bottom plate of the container,
Bentonite mixed soil quality control equipment. In the bentonite mixed soil quality control device according to claim 3,
It is equipped with a photographing device for photographing the bentonite mixed soil accommodated in the container,
Bentonite mixed soil quality control equipment.

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