JP2007075742A - Soil deodorant and deodorization method of soil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a soil deodorant which has immediate effect as well as durability and comprises components quite different from those of the conventional soil deodorant, and to provide the deodorization method of soil using the soil deodorant. <P>SOLUTION: In the soil deodorant, a plant extract is used as an available component. In the deodorization method of soil, a plant extract is scattered to soil contaminated by a fuel compound. In a preferable embodiment, a herb extract is used as the plant extract. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a soil deodorant and a soil deodorization method.

  Soil deodorants are used when various types of contaminated soil are removed, and various types are known. For example, when removing deposited sludge, a deodorizer for spraying containing ferric chloride as a main component of dissolved components and containing calcium chloride as appropriate is known as a deodorizer used by spraying on the deposited sludge. (For example, refer to Patent Document 1).

JP 2003-326298 A

  An object of the present invention is to provide a soil deodorant that has immediate effect as well as sustainability and has completely different components from conventional soil deodorants, and a soil deodorization method using the soil deodorant.

  As a result of intensive studies, the present inventors have obtained knowledge that plant extracts such as herbal extracts are extremely effective as soil deodorants, and have completed the present invention.

  That is, the first gist of the present invention resides in a soil deodorant containing a plant extract as an active ingredient, and the second gist is characterized in that the plant extract is sprayed on soil contaminated with a fuel compound. It exists in the deodorizing method of soil.

  ADVANTAGE OF THE INVENTION According to this invention, the soil deodorant which has an immediate effect with sustainability, and consists of a completely different component from the conventional soil deodorizer and the said soil deodorizer are provided.

  Hereinafter, the present invention will be described in detail. However, the description of the constituent elements described below is a representative example of embodiments of the present invention, and the present invention is not limited to these contents.

  The soil deodorant of the present invention contains a plant extract as an active ingredient. Examples of plant extracts include herb extracts such as rosemary, lemongrass, spearmint, mint, sage, thyme, and ginger. Rosemary, lemongrass and ginger are particularly preferred, and rosemary has a deodorizing effect. To most preferred.

  In general, a plant extract can be extracted by drying leaves and stems and using hexane, ethyl acetate, ethanol, ether, alkaline water, neutral water, acidic water, or a mixture thereof. It can also be extracted using supercritical carbon dioxide. Preferably, extraction is performed using hexane, hexane / ethanol, ethanol, ethanol / water. Usually, 10 kg of the above solvent is used to stir and extract at 5 to 60 ° C. with respect to 1 kg of plant, followed by filtration to obtain a filtrate. Further, the residue is repeated several times with the same solvent to obtain a filtrate. These filtrates are combined and concentrated under reduced pressure to obtain a plant extract.

  The plant extract used for the soil deodorant of the present invention is preferably a non-oil soluble plant extract, and particularly preferably a non-oil soluble rosemary extract. In the present invention, non-oil-soluble means that the solubility of hexene at 30 ° C. is less than 50 g / L.

  Carnosol and carnosic acid are obtained as a water-insoluble extract of rosemary, and an example of the production method is as follows. First, as in the case of the water-soluble extract described above, extraction with hydrous ethanol, water is added to the extract to precipitate water-insoluble components, activated carbon is added and stirred, and water-insoluble components and The mixture with activated carbon is separated, the resulting mixture is extracted with ethanol, ethanol is distilled off from the resulting extract, and carnosol and carnosic acid are obtained as a powdery concentrate. The details can be referred to the description in Japanese Patent Publication No. 59-4469.

  In this invention, the other component which does not impair the effect of the soil deodorant of this invention can be used together with said plant extract.

  Examples of the other components include polyglycerin laurate, polyglyceryl myristate, polyglyceryl palmitate, polyglycerin stearate, polyglycerin fatty acid ester such as polyglycerin oleate, sucrose laurate, Examples thereof include sucrose fatty acid esters such as sucrose myristic acid ester, sucrose palmitic acid ester, sucrose stearic acid ester, and sucrose oleic acid ester.

  In addition, saccharides, sugar alcohols, water-soluble antioxidants and the like can be used in combination. Examples of the saccharide include glucose, sucrose, and oligosaccharide. Examples of the sugar alcohol include oligotoose, trehalose, xylitol, and erythritol. Examples of the water-soluble antioxidant include vitamin C, ascorbic acid, and isoascorbic acid. Alternatively, salts thereof (for example, alkali metal salts, alkaline earth metal salts, etc.), catechins, catechins-containing natural extracts and the like can be mentioned.

  Said combined component is normally used in the ratio of 50 weight% or less with respect to a plant extract.

  The contaminated soil to which the soil deodorant of the present invention is applied is not particularly limited, and examples thereof include contaminated soil such as removal of accumulated sludge, oil fields, and gas stations. Contamination that generates an unpleasant odor in a small amount is a target for the type of contamination. For example, gasoline stations are known to leak gasoline at many stations. In gasoline, an unpleasant gasoline odor is strongly generated even at soil concentrations below the lower limit of quantification (so-called non-detection: carbon tetrachloride extraction—less than 10 mg / kg or 20 mg / kg in IR absorption method). Target pollutants include gasoline, kerosene, light oil and heavy oil.

  The application method of the soil deodorant of the present invention is the same as the conventional soil deodorant, and examples thereof include a method of injecting or spraying to contaminated soil. It is recommended to use a high pressure washer as the machine to spray.

  When the underground tank is removed from the gas station, it is sprayed directly on the soil or underground tank that generates oily odor when excavating the soil with the backhoe or lifting the underground tank from the ground. Further, when there is a well in the target range, the deodorant may be injected from the well. When a new injection well is established, the range (plane and depth) of the soil where the oily odor is generated is specified, and the injection wells having a diameter of about 2 to 5 cm are covered by 0.5 to 2 m so as to cover the range. Install in. A blow-type boring machine is used to install the injection well. In the injection well, a screen will be installed at a depth to which the deodorant is injected. Injecting, a tank with a deodorant adjusted and an injection well are connected with a hose, and a pump (a commercially available power sprayer or the like can be used) is sent to the target soil through the well at a predetermined flow rate. The application amount of the soil deodorant is appropriately determined depending on the degree of contamination (odor) of the contaminated soil. By the way, when removing an underground tank from a gas station, the amount of deodorant (adjusted) used to remove one underground tank (length 7m, diameter 2m) is 100 to 200 liters. .

  As a method for measuring odor, a technique for analyzing volatile components generated from a sample is used. Conventionally, GC-MS has been measured, but recently, a head space method is used in which a sample is put in a sample tube and a volatile component in an upper space portion is directly measured. By using this method, all volatile components can be analyzed by GC-MS. Odor identification can be analyzed from the total ion chromatogram of odor components.

  EXAMPLES Hereinafter, although an Example and a test example demonstrate this invention further in detail, this invention is not limited to a following example, unless the summary is exceeded. In the following examples, a soil deodorant containing rosemary extract (“RM Keeper METAC” manufactured by Mitsubishi Chemical Foods Corporation) as an active ingredient was used.

Example 1:
When excavating the soil at a depth of minus 3 m from the surface of the former gas station where there was a gasoline leak, a noticeable oily odor was observed. When “RM keeper METAC” was diluted 10-fold with tap water to prepare a solution, about 100 ml was added almost evenly to about 1000 cm ^{3 of} soil where oily odor was observed, and lightly mixed. Reduced to unseen level. Untreated soil and soil treated with “RM keeper METAC” (10 g) are taken in a sample tube, measured by headspace gas chromatography (Agilent 6890GC), and the odor of contaminated soil, aliphatic hydrocarbons and aromatic hydrocarbons The odor intensity was evaluated by comparing as 100 with no addition. The results are shown in Table 1.

Test Example 1 (Bromide prevention test for water in soil):
Water in the “RM keeper METAC” added soil and the non-added soil obtained in Example 1 was collected, and the odor persistence when “RM keeper METAC” was added was measured by headspace gas chromatography. And it evaluated by comparing the odor intensity | strength of toluene, trimethylbenzene, and naphthalene as additive-free 100. FIG. The results are shown in Table 2.

Test Example 2 (Bromide prevention test of model soil):
The model soil was subjected to a deodorization test using “RM keeper METAC”, sage extract (DDF), and commercial deodorizer “Fabries” (P & G). “RM keeper METAC” and sage extract (DDF) were each diluted 10-fold with tap water. A model soil is prepared by adding 0.5% by weight of petroleum to non-contaminated soil, and approximately 100 ml of each of the above-mentioned soil deodorants is added almost uniformly to the model soil of about 1000 cm ³ , and lightly mixed. Went. The results are shown in Table 3.

Claims (5)

  A soil deodorant containing a plant extract as an active ingredient.   The soil deodorant according to claim 1, wherein the plant extract is an herbal extract.   The soil deodorant according to claim 1, wherein the plant extract is an insoluble oil-soluble rosemary extract.   The soil deodorizer according to any one of claims 1 to 3, wherein the soil is soil contaminated with a fuel compound.   A method for deodorizing soil, which comprises spraying a plant extract onto soil contaminated with a fuel compound.