JP2005066571A - Method for controlling generation of malodor, or the like - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for controlling the generation of malodor or the like, in which the generation of the malodor, or the like, can be controlled continually by spraying on heaped materials such as dirt, kitchen garbage, and sludge, which generate the malodors, or the like. <P>SOLUTION: The generation of the malodor or noxious gas is controlled by coating a surface of a material such as waste material, which produces the malodor or the noxious gas, with a slurry containing a coating composition of high water holding property. The coating composition having the high water holding property is composed of a fiber substance such as cellulose fiber, natural or synthetic polymeric compound, and inorganic compound powder, dispersed in an aqueous medium. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for suppressing the generation of bad odors and the like which suppresses the generation of bad odors and toxic gases (hereinafter referred to as bad odors) by spraying deposits that generate bad odors such as filth, garbage, and sludge.

  There are various types of malodorous substances such as factory smoke and waste liquids, cigarettes, manure, kitchen urns, etc., and the causative substances cannot be discussed uniformly, but amines such as trimethylamine, which is a rotting odor of fish and meat, eggs Septic odor of milk and milk, hydrogen sulfide septic odor of vegetables and garbage, mercaptans such as methyl mercaptan septic odor of vegetables and garbage, toilet odor ammonia, cigarette odor, sweat and body odor Organic acids such as butyric acid.

  Various methods have been known so far, such as a physical method such as a water washing method, a cooling method, and an adsorption method, and a chemical method such as a combustion method, a chemical treatment method, and a masking method, in order to eliminate such bad odors and off-flavors. In simple toilets, garbage collection places, garbage trucks, etc. used in hospitals and nursing homes, the source of bad odor is added or moved one after another. In addition to being able to cope with processing where the processing location is specified, it is not practical to provide a large-scale deodorizing device and deodorizing device.

  Once malodorous odors are diffused into the air from their source, the sensory threshold concentration of the source malodorous substance is very low. And the amount of deodorant. Therefore, in order to produce an efficient deodorizing effect, it is important how to suppress the off-flavor from the source.

  Therefore, various foaming deodorants containing carbonates and surfactants have been proposed as deodorants and deodorants that can be used easily (for example, Japanese Patent Laid-Open Nos. 1-288267 and 2-147061). JP-A-4-30855, JP-A-6-105893, JP-A-7-8546 and JP-A-7-278598). However, these foaming deodorants are basically sprayed with a spray solution of a deodorizing composition on the surface of a malodorous source, foamed and covered with a foam-like protective film to block the odor from the outside air and Although it is neutralized with a deodorant, etc., the foaming and expansion action during processing is weak, the deodorant does not penetrate and contact the details of the malodorous substance, it can not be said that it is a method to eliminate the bad smell fundamentally, It was difficult to maintain the foam for a long time, and there was a problem that the deodorizing effect was insufficient.

Therefore, as a deodorizing method capable of maintaining the effect for a long time, JP 2001-353208 A discloses an aqueous solution containing a water-soluble polymer compound, an amphoteric surfactant and water by spraying or the like. A method of foaming and covering an odor generating source is disclosed, and Japanese Patent Application Laid-Open No. 5-050056 uses a water-soluble polymer, a water-dispersible polymer, a foaming agent, and a deodorizing agent containing water. However, in Table 99/012854, there is proposed a method for treating sludge or excrement in which the surface of fine lime particles is coated with a coating comprising a higher fatty acid, a salt thereof and an ester.
JP-A-1-288267 JP-A-2-1477061 Japanese Unexamined Patent Publication No. 4-30855 JP-A-6-105893 JP 7-8546 A JP-A-7-278598 JP 2001-353208 A JP-A-5-050056 No. 99/012854

  However, in each method as described above, the effect differs depending on the odor component, and the effect of suppressing the odor or the like remains temporarily. To maintain this effect, it is necessary to spray frequently.

  That is, an object of the present invention is to provide a method for suppressing the generation of bad odors and the like that can continuously suppress the generation of bad odors by spraying on deposits such as filth, garbage, and sludge.

  According to the first aspect of the present invention, there is provided a method for suppressing the generation of malodor or toxic gas by coating the surface of a substance that generates malodor or toxic gas such as waste with a slurry containing a coating composition having high water retention. It is characterized by suppressing the occurrence.

  In addition, the method for suppressing the generation of malodors according to claim 2 is characterized in that, in the claim 1, a substance having a deodorizing, deodorizing or sterilizing effect is blended in the slurry.

  According to a third aspect of the present invention, there is provided a method for suppressing the occurrence of bad odor or the like according to the second aspect, wherein the substance having a deodorizing, deodorizing or bactericidal effect contains nitrate ions or sulfite ions.

  The method for suppressing the occurrence of malodors according to claim 4 is the method according to any one of claims 1 to 3, wherein the coating composition contains a fiber material, and the slurry containing the fiber material generates malodor or toxic gas. The coating layer is formed by spraying on the surface of the substance to be performed.

  According to a fifth aspect of the present invention, in the method for suppressing the generation of malodors or the like according to the fourth aspect, the fiber substance is a cellulose fiber.

  The method for suppressing the generation of malodor or the like according to claim 6 is characterized in that in any one of claims 1 to 5, the coating composition contains a natural or synthetic polymer compound.

  The bad smell generation suppression method according to claim 7 is characterized in that, in any one of claims 1 to 6, the coating composition contains a swellable inorganic compound powder.

  Furthermore, the bad smell generation suppression method according to claim 8 is characterized in that, in any one of claims 1 to 7, the coating composition contains a fragrance.

  In the method for suppressing the generation of malodors and the like according to the present invention, odors are prevented from leaking to the air side by blocking between a substance that generates malodors and the air with a slurry containing a coating composition having high water retention. In particular, since there are many water-soluble odor components, the odor can be taken into the coating composition having high water retention so as not to cause odor on the air side. In particular, the slurry can be effectively deodorized by blending a substance having a deodorizing, deodorizing or sterilizing effect, particularly a substance containing nitrate ion or sulfite ion. The above-mentioned coating composition can contain fiber materials such as cellulose fibers, natural or synthetic polymer compounds, and swellable inorganic compound powders. Furthermore, the masking effect by a fragrance | flavor can also be anticipated by making the said coating composition contain a fragrance | flavor.

  Embodiments of the method for suppressing the generation of malodors according to the present invention will be described in detail below.

  First, the coating composition used in the present invention is a composition that has a certain amount of water retention and forms a slurry by mixing with water and coats a substance that generates malodors (hereinafter referred to as waste). It is a thing.

  This coating composition is prepared by dispersing a fiber material, a natural or synthetic polymer compound having water retention, a swellable inorganic compound powder, and the like in an aqueous medium, and a fiber material is particularly preferable.

  The fiber material spreads in a mesh shape and forms a film on waste or the like. Examples of the fiber material include natural fibers such as cellulose, cotton, wool, paper, and pulp, synthetic fibers such as nylon, polyester, and polyacrylonitrile, and mineral fibers such as rock wool. Among them, cellulose fiber strips, peptized paper and pulp are preferable in terms of water dispersibility, covering properties, and the like.

  The fiber material is preferably mixed in an amount of 1 to 20 parts by weight, particularly 5 to 15 parts by weight, based on 100 parts by weight of water.

  In addition, the polymer compound having water retention is one that increases the viscosity of the coating composition to form a film on waste or the like, and may be a natural polymer compound or a synthetic polymer compound. Specifically, polyacrylic acid soda, polymethacrylic acid soda, polymaleic acid, polyvinyl alcohol, polyvinylpyrrolidone, synthetic polymer compounds such as copolymers containing these, water-soluble cellulose such as carboxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, Or natural polymer compounds, such as polysaccharides, such as xanthan gum, welan gum, guar gum, and starch, are mentioned. These polymer compounds may be used alone or in combination of two or more. The polymer compound having water retention as described above may be obtained by pulverizing a solid compound and dispersing and dissolving it in an aqueous medium. However, in the case of a synthetic polymer compound, emulsion polymerization is performed in an aqueous medium. The aqueous emulsion thus obtained may be used as it is.

  In the case of the polymer compound having water retention, 0.005 to 15 parts by weight, particularly 0.1 to 10 parts by weight, is preferably mixed with 100 parts by weight of water.

  Swellable inorganic compound powder forms a hard film on the surface of waste or the like. The inorganic compound powder may be a mineral or the like that does not substantially dissolve in water in the environment of use. Specifically, silica, alumina, bentonite, zeolite, diatomaceous earth, activated carbon, Calcium sulfate), calcium carbonate, magnesium phosphate and the like. As this inorganic compound powder, a powder having a smaller particle diameter is preferable, but generally about 10 to 300 μm.

  In the case of a swellable inorganic compound powder, it is preferable to mix 0.5 to 30 parts by weight, particularly 0.5 to 20 parts by weight with respect to 100 parts by weight of water.

  In the present invention, a surfactant can be added to the coating composition as described above. The surfactant serves to improve the wettability of the surface of the fiber material, polymer compound or inorganic compound powder in the coating composition, and uniformly disperse it in water to form a stable slurry in water. Examples of the surfactant include known surfactants such as soaps, nonionic surfactants, anionic surfactants, cationic surfactants, and amphoteric surfactants. A nonionic surfactant and an anionic surfactant.

  The chemical structure of the surfactant is not particularly limited, but preferred nonionic surfactants include, for example, polyoxyalkylene aryl phenyl ether, polyoxyethylene nonyl phenyl ether, block copolymer of ethylene oxide and pyropyrene oxide. Examples thereof include polyoxyethylene surfactants such as polymers. Examples of the anionic surfactant include polycarboxylic acid surfactants and dialkylsulfosuccinic acid ester metal salts. Examples of these metal salts include sodium salts, potassium salts, and magnesium salts.

  Moreover, in this invention, the compound (deodorant) which has a deodorizing effect | action with a coating composition as needed can be mix | blended suitably in the range which does not impair the effect of this invention. As this deodorant, nitric acid such as these salts that release nitric acid and nitrite ions in an aqueous solution, nitrite-based deodorants, and chlorine-based deodorants such as sodium hypochlorite can be used. . Furthermore, a compound having a bactericidal action (bactericidal agent), an aromatic compound (fragrance) such as wood vinegar or perfume oil, and other various colorants can be appropriately blended within a range not impairing the effects of the present invention. In addition, a coloring agent is for giving a desired color to the film by a coating composition, and improving an external appearance.

  The method for preparing the coating composition containing various components as described above is not particularly limited, but first, water alone or a medium in which water and another solvent such as a water-soluble organic solvent are mixed as necessary. After adding the surfactant, add one or more of fiber material, polymer compound or inorganic compound powder, and deodorant, disinfectant, fragrance, colorant, etc. as needed Can be dispersed uniformly to form a slurry. Furthermore, it is more preferable to add a step of mechanically dispersing with a propeller stirrer or the like. In addition, about the compounding quantity of a fiber substance, a high molecular compound, or an inorganic compound powder, it is as having each mentioned above, However, When using 2 or more types together, each sum total is 1 part with respect to 100 weight part of water. What is necessary is just to make it be -40 weight part.

The foul odor generation suppression method of the present invention sprays the above-described coating composition on deposits that generate odors and toxic gases such as filth, garbage, sludge, etc. It is to prevent. Although this spraying method is not specifically limited, it is good to spray over a wide range by applying pressure and ejecting from a nozzle. The amount of application at this time may be such that the surface of the deposit is uniformly coated, and is preferably 1 to ⁴ L (liter) per 1 m ^{2 of} the covering area.

The present invention will be described in more detail with reference to the following specific examples and comparative examples.
Example 1 and Comparative Example 1
To 100 parts by weight of water, 10 parts by weight of defibrated waste paper was added and mixed well to prepare a coating composition as a slurry. After spraying 3 L / m ² of the coating composition of Example 1 on a surface of about 4000 cm ³ of sludge filled in a container to a depth of 50 cm, the container was covered and 1, 5, 10, 24, 48, Tables 1 and 2 show the results of measuring the ammonia concentration and hydrogen sulfide concentration in the odor generated after 72 hours with a detector tube, respectively.

  For comparison, Tables 1 and 2 show the results of measuring the ammonia concentration and hydrogen sulfide concentration in the odor in the same manner for the sludge itself filled up to a depth of 50 cm without spraying the coating composition. It shows together with.

Example 2
To 100 parts by weight of water, 1 part by weight of poly (sodium acrylate) was added and mixed well to form a slurry to prepare a coating composition. After the coating composition of Example 1 and 3L / m ² dispersed on the surface of the same sludge of Example 2 was measured ammonia concentration and hydrogen sulfide concentrations in the odor generated in the same manner. The results are shown in Tables 1 and 2.

Example 3
To 100 parts by weight of water, 0.5 part by weight of polyacrylic acid soda and 3 parts by weight of defibrated waste paper were added and mixed well to form a slurry to prepare a coating composition. After coating 3 L / m ² of the coating composition of Example 3 on the same sludge surface as Example 1, the ammonia concentration and hydrogen sulfide concentration in the similarly generated odor were measured. The results are shown in Tables 1 and 2.

Example 4
To 100 parts by weight of water, 20 parts by weight of stone, 1 part by weight of bentonite, 0.01 part by weight of hydroxyethyl cellulose and 8 parts by weight of defibrated waste paper were added and mixed well to prepare a coating composition. After coating 3 L / m ² of the coating composition of Example 4 on the same sludge surface as Example 1, the ammonia concentration and hydrogen sulfide concentration in the odor generated in the same manner were measured. The results are shown in Tables 1 and 2.

Example 5 and Comparative Example 2
In Example 4, 70 parts by weight of a 50% calcium nitrate aqueous solution was further blended and mixed well into a slurry to prepare a coating composition. After 5 L / m ² of the coating composition of Example 5 was sprayed on the same sludge surface as in Example 1, the ammonia concentration and hydrogen sulfide concentration in the odor generated in the same manner were measured. The results are shown in Tables 1 and 2.

For comparison, a composition in which only 70 parts by weight of a 50% calcium nitrate aqueous solution was blended with 100 parts by weight of water without blending stone, bentonite, hydroxyethyl cellulose, and defibrated waste paper with Example 1 was used. After spraying 4 L / m ² (same as Example 5 in terms of calcium nitrate) on the surface of the same sludge, the ammonia concentration and the hydrogen sulfide concentration in the similarly generated odor were measured. The results are shown in Tables 1 and 2.

Example 6 and Comparative Example 3
In Example 4, 70 parts by weight of a 1% sodium hypochlorite aqueous solution was further blended and mixed well to form a slurry to prepare a coating composition. After spraying 5L / m ² of the coating composition to a surface of the same sludge as in Example 1 of this Example 6 was measured ammonia concentration and hydrogen sulfide concentrations in the odor generated in the same manner. The results are shown in Tables 1 and 2.

For comparison, a composition was prepared by blending only 70 parts by weight of a 1% aqueous sodium hypochlorite solution with respect to 100 parts by weight of water without blending stone, bentonite, hydroxyethyl cellulose, and defibrated waste paper. After 4 L / m ² (same as in Example 6 in terms of calcium nitrate) was sprayed on the same sludge surface as in Example 1, the ammonia concentration and hydrogen sulfide concentration in the odor generated in the same manner were measured. The results are shown in Tables 1 and 2.

  As is clear from Tables 1 and 2, the methods for suppressing the generation of bad odor and the like according to each example are the methods of Comparative Examples 2 and 3 using a calcium nitrate aqueous solution and a sodium hypochlorite aqueous solution, both of which are conventional odor inhibitors. It can be seen that the ammonia and hydrogen sulfide concentrations are kept low over a long period of time, and the odor suppression effect is excellent. In particular, even in Example 1 in which waste paper defibrated with water was blended, the surprising results of exhibiting an odor suppressing effect were obtained as compared with Comparative Examples 2 and 3 described above. It was found that a high odor suppressing effect can be obtained only by coating the surface of a deposit that generates malodor such as the above with the coating composition as in the present invention.

  According to the method for suppressing the occurrence of malodor etc. of the present invention, it is possible to obtain the effect of suppressing the occurrence of malodor, etc., which is superior to the conventional odor suppressor calcium nitrate aqueous solution, sodium hypochlorite aqueous solution and the like with a simple composition, A particularly excellent effect is exhibited by using a fiber material, a polymer compound and an inorganic compound powder in combination.

Furthermore, by adding a deodorant, a bactericidal agent, a fragrance, etc., various measures can be taken according to the use and the object to be treated.

Claims (8)

A method for suppressing the generation of malodors or toxic gases by covering the surface of a substance that generates malodorous or toxic gases such as waste with a slurry containing a coating composition having high water retention, thereby suppressing the generation of malodorous or toxic gases. . The method for suppressing the occurrence of malodors according to claim 1, wherein a substance having a deodorizing, deodorizing or sterilizing effect is blended in the slurry. The method for suppressing the generation of malodors or the like according to claim 2, wherein the substance having a deodorizing, deodorizing or sterilizing effect contains nitrate ions or sulfite ions. The method for suppressing the generation of malodors according to any one of claims 1 to 3, wherein the coating composition contains a fiber substance. 5. The method for suppressing the occurrence of malodor or the like according to claim 4, wherein the fiber material is a cellulose fiber. 6. The method for suppressing the generation of malodors or the like according to any one of claims 1 to 5, wherein the coating composition contains a natural or synthetic polymer compound. The method for suppressing the occurrence of bad odor or the like according to any one of claims 1 to 6, wherein the coating composition contains an inorganic compound powder. The method for suppressing the occurrence of bad odor or the like according to any one of claims 1 to 7, wherein the coating composition contains a fragrance.