JP2002018385A - Contaminant disposal method for existing waste treating plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contaminant disposal method for simple decomposition treatment of a large amount of the contaminants in the soil of an existing waste treating plant. SOLUTION: Mushroom beds having contaminant disposal ability are previously pulverized to a powder form and are kept stored in a powder supplying means for supplying the powder mushroom beds to an improving machine 1. On the other hand, the improving machine 1 is fixed to the position to be supplied with the powder mushroom beds. A vertically movable agitating vane section 2 of the improving machine 1 is rotated and the contaminated soil is downward excavated by a bit for excavation disposed on the base surface of the agitating vane section 2, by which the agitating vane section 2 is penetrated into the soil. Upon completion of the penetration, the powder mushroom beds previously stored in the powder supplying means and air are supplied to the improving machine 1, and while the agitating vane section 2 is withdrawn under rotation, the powder mushroom beds are uniformly and successively sprayed into the soil.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for decomposing hard-to-decompose contaminants existing in an existing waste disposal site and adversely affecting the environment by using a bacterial bed capable of decomposing contaminants.

[0002]

2. Description of the Related Art Conventionally, a technique called bioremediation is known as a technique for decomposing contaminants with microorganisms to render them harmless. It uses the ability of bacteria and mold to decompose and decomposes pollutants. Certainly, in this bioremediation method, no drug is used, and contaminants can be decomposed safely at low cost.

[0003] In existing waste treatment plants, there is a problem in that organic chlorine compounds such as dioxin, trichloroethylene and tetrachloroethylene and other hardly decomposable substances are present in large quantities as pollutants. If these contaminants are left as they are, harmful gases may diffuse to the surroundings, or the contaminants may be mixed into groundwater by rainwater, which may adversely affect the surrounding environment.

[0004]

However, depending on the bacterium and mold used in the bioremediation method, the aforementioned organic chlorine-based compounds such as dioxin, trichloroethylene and tetrachloroethylene, and other pollutants that are difficult to decompose. The substance could not be decomposed. For this reason, such pollutants have been left untreated at existing waste disposal sites.

By the way, in order to inoculate mushrooms, for example, white rot fungi, and grow their hyphae,
Bacterial beds in which a culture medium additive and water are mixed have conventionally been used. In this specification, a bacterial bed for inoculating and growing edible mushrooms is particularly referred to as an edible bacterial bed. Now, the present inventors use this bacterial bed as the contaminants (for example, organic chlorine compounds such as dioxin, solvents for cleaning substrates, aromatic carbohydrates such as benzopyrene, and hardly decomposable substances such as mercury materials).
It has been found that when mixed into contaminated soil containing water and contaminants, the contaminants are decomposed by the synergistic effect of the growing mycelium and the decomposing enzyme generated by the fungi. Also, when the used fungus bed obtained by collecting the mushrooms grown on the above-mentioned fungus bed, and the waste fungus bed that has been conventionally discarded is mixed with the above-mentioned contaminant or contaminated soil, the contaminant is similarly used. Was found to be decomposed.

[0006] On the other hand, the present inventors have proposed powder injection stirring (DJ
M) Focused on the construction method. In this method, screw-type equipment used for the pillar pile method and the earth auger method is inserted into the soil, and powder and the like such as an improving material are injected into the soil through the equipment to supply the supplied powder. This is to stir and mix the grains and the soil.

Accordingly, the present invention provides a method of using a bacterial bed such as an edible bacterial bed or a waste bacterial bed in a method such as the DJM method.
The objective is to effectively decompose the pollutants contained in the soil at the existing waste disposal site in large quantities.

[0008]

SUMMARY OF THE INVENTION The present invention uses powder injection and agitation means for agitating a powder while injecting the same into a contaminated soil and waste containing contaminants at an existing waste treatment plant. The present invention proposes a method for treating contaminants by mixing a bacterial bed or a crushed or dissolved solution thereof. In this method, the bacterial bed may be an edible bacterial bed or a waste bacterial bed.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In one embodiment of the method for treating pollutants of the present invention described below, an improved machine 1 as shown in FIG.
Of contaminants existing in existing waste disposal sites by the DJM method using

First, a bacterial bed (edible bacterial bed or waste bacterial bed) capable of treating contaminants is crushed, for example, to a diameter of 5 m.
m, and stored in a powder supply means for supplying the powdered bacterial bed to the improvement machine 1. The diameter of “5 mm” is the maximum diameter of the powder that can be handled by the improved machine 1 of the DJM method.

On the other hand, the improvement machine 1 is fixed at a position where the powdered bacterial bed is to be supplied. Then, the vertically movable stirring blade section 2 of the improvement machine 1 is rotated, and the contaminated soil is excavated downward by a drill bit (not shown) provided on the bottom surface of the stirring blade section 2 so that the stirring blade section 2 is soiled. Let it penetrate inside. After the penetration is completed, the bed of powdered bacteria and the air stored in the powder supply means are supplied to the improvement machine 1, and the bed of powdered bacteria is evenly dispersed in the soil while pulling out while rotating the stirring blade section 2. I do. Such work is repeated at existing waste treatment plants where organic chlorine compounds such as dioxin, trichloroethylene and tetrachloroethylene and other hardly decomposable substances are contained as contaminants. Are distributed.

After several weeks, the mycelium grows from the powdered bacterial bed stirred and mixed with the soil, and a decomposing enzyme is generated in the growth process. The contaminants in the contaminated soil are decomposed and made harmless by the synergistic effect of the grown mycelium and the decomposing enzyme. For example, in the case of anthracene, pyrene and phenanthrene, 200 ppm is reduced by 90% in one month, and in case of benzpyrene, it is reduced by 60%. For dioxin, 20,000 pg TEQ / g is reduced by about 60% in 2 months.

[0013] In order to promote the growth of hyphae and the decomposition of pollutants, air supply means such as aeration pipes may be provided in the soil of the waste treatment plant as needed.
Further, in the above embodiment, DJ powder is supplied to supply the powdered bacterial bed.
Although the M method was used, any method may be used as long as it can supply and mix the bacterial bed into the contaminated soil of the waste treatment plant. Furthermore, the bacterial bed to be supplied into the contaminated soil at the waste disposal site does not necessarily need to be in the form of powder, and the bacterial bed before pulverization may be supplied, or a solution of the bacterial bed may be injected. You may make it.

[0014]

According to the present invention, it is possible to decompose a large amount of contaminants contained in contaminated soil only by supplying and mixing bacterial beds into contaminated soil at an existing waste disposal site. Can be.

[Brief description of the drawings]

FIG. 1 is a schematic view of an embodiment in which the present invention is applied to a DJM method.

[Explanation of symbols]

 1 improved machine 2 stirring blade

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Toshiya Okada 4-640 Shimoseito, Kiyose-shi, Tokyo F-term in Obayashi Corporation Technical Research Institute Co., Ltd. 4D004 AA41 AA46 AC07 BB03 CA15 CA18 CB27 CC07

Claims (2)

[Claims] 1. Mixing a bacterial bed or its crushed material or a solution into contaminated soil and waste at an existing waste disposal site by using powder injection and stirring means for stirring while injecting powder. Pollutant treatment method. 2. The method according to claim 1, wherein the bacterial bed is an edible bacterial bed or a waste bacterial bed.