JP2005246345A - Method for treating solid waste and method for regenerating waste landfill site - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for easily treating surely the halogenated organic matter and heavy metals contained in solid waste or landfilled waste at a waste landfill site where solid waste is landfilled since there is a possibility that harmful halogenated organic matter such as dioxins and heavy metals are contained in solid waste such as the fly ash and main ash discharged from a rubbish incineration plant or the like and therefore such a possibility is designated that halogenated organic matter and heavy metals are eluted from the waste landfill site where solid waste such as fly ash is landfilled and contaminate the environment. <P>SOLUTION: This method for treating solid waste comprises the steps of: adding a compound selected from phosphorous acids and hypophosphorous acids, a sulfur compound and an alkali compound to solid waste; and heat-treating the obtained mixture. This method for regenerating the waste landfill site comprises the steps of: digging the landfilled waste at the waste landfill site where solid waste is landfilled; adding the compound selected from phosphorous acids and hypophosphorous acids, the sulfur compound and the alkali compound to the dug waste; and heat-treating the obtained mixture. In this case, the heat-treatment is preferably performed at ≤500°C. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a solid waste treatment method capable of detoxifying hazardous heavy metals and organic halides contained in solid waste such as fly ash, and waste landfill treatment using landfill of solid waste. It is related with the reproduction method of a place.

  In recent years, when waste is incinerated at a garbage incinerator, etc., extremely toxic organic halides such as dioxins (PCDDS, PCDFS, etc.) are produced and contained in smoke in high concentrations. There is a big social problem. In addition, fly ash separated from smoke and main ash, which is the residue of incineration, may contain a large amount of organic halides such as dioxins. It has been pointed out that there is a possibility that a wide range of environmental pollution problems may occur from landfill disposal sites, such as organic halides leaching from rainwater, etc., and contaminating groundwater, rivers, and the like. Organic halides such as dioxins are extremely stable substances and do not disappear semi-permanently in the natural environment. Therefore, combined with their strong toxicity, they are regarded as important chemical substances for environmental pollution control. On the other hand, with the recent diversification of garbage, the fly ash may contain a large amount of harmful heavy metals, and there is a possibility of environmental pollution due to elution of heavy metals from waste landfills. Yes.

  As a method of reducing the amount of dioxins and the like contained in solid waste such as fly ash, a method of decomposing dioxins by heating fly ash in a non-passage system in an oxygen-deficient state (Patent Document 1), activated carbon Suppresses dioxin formation reactions of adsorbents that adsorb dioxin precursors such as silica, zeolite and zeolite, silicic acid compounds such as sodium silicate, phosphoric acid compounds, ammonium compounds such as diammonium hydrogen phosphate, and amine compounds A method of adding an inhibitor to the flue gas (Patent Document 2), a method of adding an amine compound such as monoethanolamine, triethanolamine, and methanolamine to fly ash (Patent Document 3), during incineration In the process where the temperature of the generated flue gas is 500 ° C. or less, the method of bringing the flue gas into contact with the reducing agent (Patent Document 4), the flue gas temperature is 50 ℃ while in the above, after spraying an aqueous solution containing a reducing agent to the flue gas, a method of quenching the flue gas (Patent Document 5) have been proposed.

Japanese Patent Publication No. 6-38863 JP-A-10-296050 Japanese Patent Laid-Open No. 10-272440 Japanese Patent Laid-Open No. 11-137952 JP 2002-102650 A

  However, in the method described in Patent Document 1, the dioxins cannot be effectively decomposed unless they are in an oxygen-deficient state, and in order to obtain an oxygen-deficient state, working in a closed system or in an inert gas atmosphere Since it is necessary to adopt a method such as elimination of intrusion, and a heat-treatment device with high airtightness is required, there is a problem that high costs are required for equipment investment, equipment maintenance, and the like. In this method, even if the chlorinated aromatic compound such as dioxins can be decomposed by heating once, the decomposition products may be combined under heating conditions to generate dioxins and the like again.

  The methods described in Patent Document 2 and Patent Document 3 can treat dioxins and the like without requiring special equipment as in the method described in Patent Document 1, but can treat heavy metals. Since this is not possible, the dioxins treatment and the heavy metal immobilization treatment must be performed separately, resulting in a problem that the treatment work becomes complicated. On the other hand, the methods described in Patent Documents 4 and 5 are used to reduce dioxins in the flue gas and reduce the heavy metals from the fly ash easily without using special processing equipment. Is possible. However, in the method of Patent Document 4 in which flue gas is treated at 500 ° C. or less, if the content of dioxins and their precursors and the content of heavy metals are large, the amount of reducing agent used must be increased, There was a possibility that it would be difficult to sufficiently treat heavy metals. Further, in the method of Patent Document 5, dioxins may be generated again unless rapidly cooled after the treatment. Further, in recent years, wastes such as fly ash are treated by the methods of Patent Documents 1 to 5 and other methods, and the amount of heavy metals eluted from the waste and the amount of remaining organic halides are regulated. Although required by law, there are many landfill sites where solid waste such as fly ash and main ash is landfilled before the law is enacted. Recently, heavy metals from these landfill sites It has been pointed out that there is a possibility of causing environmental pollution due to elution of organic halides.

  The present invention can be processed at a relatively low temperature without using a special heat treatment apparatus and the like, and even if low-temperature processing is performed, heavy metals and organic halides in solid waste can be safely and reliably removed. An object of the present invention is to provide a waste treatment method that can be detoxified. It is another object of the present invention to provide a method for regenerating a waste disposal site by reliably detoxifying harmful substances in solid waste landfilled in a waste landfill site.

That is, the present invention
(1) A solid waste treatment method, comprising adding a compound selected from phosphorous acid and hypophosphorous acid, a sulfur compound and an alkali compound to the solid waste, followed by heat treatment,
(2) The solid waste treatment method according to (1), wherein the heat treatment is performed at a temperature of 500 ° C. or lower,
(3) Excavating the landfill waste at the landfill disposal site where the solid waste is landfilled, and adding the compound selected from phosphorous acid and hypophosphorous acid, sulfur compounds and alkali compounds to the excavated waste A method for reclaiming a waste landfill treatment site, characterized by heat treatment
(4) A method for regenerating a waste landfill treatment site according to (3) above, wherein the heat treatment is performed at a temperature of 500 ° C. or lower,
Is a summary.

  According to the method of the present invention, harmful heavy metals contained in solid waste can be fixed, and harmful organic halides such as dioxins are also reliably decomposed to make solid waste harmless. In addition, it is possible to safely reprocess the landfill waste of the waste landfill treatment site where the solid waste is landfilled to regenerate the waste landfill treatment site.

  In the present invention, the sulfur compound includes carbon disulfide, sodium sulfate, sodium sulfide, sodium hydrogen sulfide, sodium thiosulfate, sodium sulfite, sulfur monochloride, sulfur dichloride, ammonium peroxodisulfate, sodium peroxodisulfate, sodium hydrogensulfite, Examples include hydroxylamine sulfate and sodium hyposulfite.

Moreover, as a sulfur compound, the compound which made carbon disulfide react with amino compounds, such as piperazine, and introduce | transduced the dithio acid group or its salt into the nitrogen atom of an amino compound can also be used. Examples of amino compounds include monoalkylamines such as monomethylamine, monoethylamine, monopropylamine, monoisopropylamine, monobutylamine, monoisobutylamine; dimethylamine, diethylamine, dipropylamine, diisopropylamine, dibutylamine, diisobutylamine, Dialkylamines such as ethylmethylamine, methylpropylamine, isopropylmethylamine, butylmethylamine, isobutylmethylamine, ethylpropylamine, ethylisopropylamine, butylethylamine, ethylisobutylamine, isopropylpropylamine, butylpropylamine, butylisobutylamine Ethylenediamine, propylenediamine, butylenediamine, hexamethylenediamine, diethylene Reamine, dipropylenetriamine, dibutylenetriamine, triethylenetetramine, tripropylenetetramine, tributylenetetramine, tetraethylenepentamine, tetrapropylenepentamine, tetrabutylenepentamine, pentaethylenehexamine, iminobispropylamine, monomethylaminopropylamine Aliphatic alcohols such as methyliminobispropylamine; monoalcoholamines such as monomethanolamine, monoethanolamine, monopropanolamine, monoisopropanolamine, monobutanolamine, monoisobutanolamine; dimethanolamine, diethanolamine, dipropanol Dialcohol amines such as amines, diisopropanolamine, dibutanolamine, diisobutanolamine; Alkylphenylamines such as tilphenylamine, ethylphenylamine, phenylpropylamine, isopropylphenylamine, butylphenylamine, isobutylphenylamine; morpholine; 2-methylmorpholine, 2-ethylmorpholine, 2-propylmorpholine, 2-isopropylmorpholine, Monoalkylmorpholine such as 2-butylmorpholine, 2-isobutylmorpholine, 3-methylmorpholine, 3-ethylmorpholine, 3-propylmorpholine, 3-isopropylmorpholine, 3-butylmorpholine, 3-isobutylmorpholine; 2,3-dimethyl Dialkylmorpholines such as morpholine, 2,5-diethylmorpholine, 2-ethyl-5-methylmorpholine; 2,3,5-trimethylmorpholine, 2,3-dimethyl-6-ene Trialkylmorpholine such as tilmorpholine; tetraalkylmorpholine such as 2,3,5,6-tetraethylmorpholine, 2-ethyl-3,5,6-trimethylmorpholine; piperazine; 1-methylpiperazine, 1-ethylpiperazine, 1 Monoalkylpiperazines such as propylpiperazine, 1-isopropylpiperazine, 1-butylpiperazine, 2-methylpiperazine, 2-ethylpiperazine, 2-propylpiperazine, 2-isopropylpiperazine, 2-butylpiperazine, 2-isobutylpiperazine; 2 , 3-dimethylpiperazine, 2,5-diethylpiperazine, dialkylpiperazine such as 1,3-diethylpiperazine; 2,3,5-trimethylpiperazine, 1,2,5-trimethylpiperazine, 2,3-dimethyl-5- Ethyl pipera Trialkylpiperazines such as 2,3,5,6-tetramethylpiperazine, tetraalkylpiperazines such as 1,3,5,6-tetrapropylpiperazine, 3-ethyl-2,5,6-trimethylpiperazine; pyrrolidine 2-methylpyrrolidine, 2-ethylpyrrolidine, 2-propylpyrrolidine, 2-isopropylpyrrolidine, 2-butylpyrrolidine, 2-isobutylpyrrolidine, 3-methylpyrrolidine, 3-ethylpyrrolidine, 3-propylpyrrolidine, 3-isopropylpyrrolidine Monoalkylpyrrolidines such as 3-butylpyrrolidine and 3-isobutylpyrrolidine; dialkylpyrrolidines such as 2,3-dimethylpyrrolidine, 2,4-diethylpyrrolidine and 2-ethyl-3-methylpyrrolidine; 2,3,4-trimethyl Pyrrolidine, 2, -Trialkylpyrrolidines such as dimethyl-5-ethylpyrrolidine; tetraalkylpyrrolidines such as 2,3,4,5-tetramethylpyrrolidine, 2-ethyl-3,4,5-trimethylpyrrolidine; piperidine; 2-methylpiperidine, 2-ethylpiperidine, 2-propylpiperidine, 2-isopropylpiperidine, 2-butylpiperidine, 2-isobutylpiperidine, 3-methylpiperidine, 3-ethylpiperidine, 3-propylpiperidine, 3-isopropylpiperidine, 3-butylpiperidine, Monoalkylpiperidines such as 3-isobutylpiperidine, 4-methylpiperidine, 4-ethylpiperidine, 4-propylpiperidine, 4-isopropylpiperidine, 4-butylpiperidine, 4-isobutylpiperidine; 2,3-dimethylpiperidine Dialkyl piperidines such as gin, 2,5-diethylpiperidine, 2,4-dipropylpiperidine, 2-methyl-4-propylpiperidine; 2,4,6-trimethylpiperidine, 2,4-ethyl-6-propylpiperidine, etc. Trialkylpiperidine of 2,3,5,6-tetramethylpiperidine, tetraalkylpiperidine such as 2,3,4,6-triethylpiperidine; 2,3,4,5,6-pentamethylpiperidine, 2,3 , 4,5,6-pentaethylpiperidine, and the like; thiomorpholine; 2-methylthiomorpholine, 2-ethylthiomorpholine, 2-propylthiomorpholine, 2-isopropylthiomorpholine, 2-butylthiomorpholine, 2- Isobutylthiomorpholine, 3-methylthiomorpholine, 3-ethyl Monoalkylthiomorpholines such as morpholine, 3-propylthiomorpholine, 3-isopropylthiomorpholine, 3-butylthiomorpholine, 3-isobutylthiomorpholine, 2,3-dimethylthiomorpholine, 2,5-diethylthiomorpholine, 2,6 -Dialkylthiomorpholine such as dipropylthiomorpholine, 2-ethyl-3-methylthiomorpholine, 2-methyl-6-propylthiomorpholine; 2,3,5-trimethylthiomorpholine, 2,3,6-triethylthiomorpholine, etc. And trialkylthiomorpholines such as 2,3,5,6-tetramethylthiomorpholine and 2-ethyl-3,5,6-trimethylthiomorpholine.
In addition, imidazolidine: 1-methylimidazolidine, 1-ethylimidazolidine, 1-propylimidazolidine, 1-isopropylimidazolidine, 1-butylimidazolidine, 1-isobutylimidazolidine, 2-methylimidazolidine, 2-ethyl Imidazolidine, 2-propylimidazolidine, 2-isopropylimidazolidine, 2-butylimidazolidine, 2-isobutylimidazolidine, 3-methylimidazolidine, 3-ethylimidazolidine, 3-propylimidazolidine, 3-isopropylimidazolidine 3-butylimidazolidine, 3-isobutylimidazolidine, 4-methylimidazolidine, 4-ethylimidazolidine, 4-propylimidazolidine, 4-isopropylimidazolidine, 4-butylimidazolidine, 4 Monoalkylimidazolidines such as isobutylimidazolidine, 5-methylimidazolidine, 5-ethylimidazolidine, 5-propylimidazolidine, 5-isopropylimidazolidine, 5-butylimidazolidine, 5-isobutylimidazolidine; 2,3- Dialkylimidazolidines such as dimethylimidazolidine, 2,5-diethylimidazolidine, 4,5-dipropylimidazolidine, 1-methyl-4-propylimidazolidine; 2,4,5-trimethylimidazolidine, 3,4- Trialkylimidazolidines such as diethyl-5-propylimidazolidine; tetraalkylimidazolidines such as 2,3,4,5-tetramethylimidazolidine, 1,2,4,5-tetramethylimidazolidine; pyrazolidine; Methylpyrazolidine, 1 Ethylpyrazolidine, 1-propylpyrazolidine, 1-isopropylpyrazolidine, 1-butylpyrazolidine, 1-isobutylpyrazolidine, 2-methylpyrazolidine, 2-ethylpyrazolidine, 2-propyl Pyrazolidine, 2-isopropylpyrazolidine, 2-butylpyrazolidine, 2-isobutylpyrazolidine, 3-methylpyrazolidine, 3-ethylpyrazolidine, 3-propylpyrazolidine, 3-isopropylpyrazine Zolidine, 3-butylpyrazolidine, 3-isobutylpyrazolidine, 4-methylpyrazolidine, 4-ethylpyrazolidine, 4-propylpyrazolidine, 4-isopropylpyrazolidine, 4-butylpyrazo Lysine, 4-isobutylpyrazolidine, 5-methylpyrazolidine, 5-ethylpyrazolidine, 5-propylpyrazolidine Monoalkylpyrazolidine such as chloroquinone, 5-isopropylpyrazolidine, 5-butylpyrazolidine, 5-isobutylpyrazolidine; 3,4-dimethylpyrazolidine, 3,5-diethylpyrazolidine, 2, Dialkylpyrazolidine such as 5-dipropylpyrazolidine, 3-methyl-5-propylpyrazolidine; 3,4,5-trimethylpyrazolidine, 2,4-diethyl-5-propylpyrazolidine and the like Trialkylpyrazolidine; tetraalkylpyrazolidine such as 2,3,4,5-tetramethylpyrazolidine, 1,4-diethyl-3,5-dipropylpyrazolidine; pyrrole; 2-methylpyrrole, 2-ethylpyrrole, 2-propylpyrrole, 2-isopropylpyrrole, 2-butylpyrrole, 2-isobutylpyrrole, 3-methylpyrrole, 3- Monoalkyl pyrrole such as til pyrrole, 3-propyl pyrrole, 3-isopropyl pyrrole, 3-butyl pyrrole, 3-isobutyl pyrrole; 2,3-dimethyl pyrrole, 2,5-diethyl pyrrole, 2,4-dipropyl pyrrole, 2 -Dialkylpyrrole such as ethyl-4-methylpyrrole and 2-methyl-3-propylpyrrole; Trialkylpyrrole such as 2,3,4-trimethylpyrrole and 2,3,5-triethylpyrrole; Tetraalkylpyrrole such as 5-tetramethylpyrrole, 2-ethyl-3,4,5-trimethylpyrrole; imidazole; 2-methylimidazole, 2-ethylimidazole, 2-propylimidazole, 2-isopropylimidazole, 2-butylimidazole 2-isobutylimidazole, -Methylimidazole, 4-ethylimidazole, 4-propylimidazole, 4-isopropylimidazole, 4-butylimidazole, 4-isobutylimidazole, 5-methylimidazole, 5-ethylimidazole, 5-propylimidazole, 5-isopropylimidazole, 5 -Monoalkylimidazole such as butylimidazole and 5-isobutylimidazole, 2,4-dimethylimidazole, 2,5-diethylimidazole, 2,4-dipropylimidazole, 2-ethyl-4-methylimidazole, 2-methyl-5 Dialkylimidazoles such as propylimidazole; Trialkylimidazoles such as 2,4,5-trimethylimidazole and 2,4,5-triethylimidazole; Pyrazole; 3-Methylpyrazole, 3 -Ethylpyrazole, 3-propylpyrazole, 3-isopropylpyrazole, 3-butylpyrazole, 3-isobutylpyrazole, 4-methylpyrazole, 4-ethylpyrazole, 4-propylpyrazole, 4-isopropylpyrazole, 4-butylpyrazole, 4 -Monobutylpyrazoles such as isobutylpyrazole, 5-methylpyrazole, 5-ethylpyrazole, 5-propylpyrazole, 5-isopropylpyrazole, 5-butylpyrazole, 5-isobutylpyrazole, 3,4-dimethylpyrazole, 3,5- Dialkylpyrazoles such as diethylpyrazole, 3,4-dipropylpyrazole and 3-ethyl-5-methylpyrazole; Trialkylpyrazo such as 3,4,5-trimethylpyrazole and 3,4,5-triethylpyrazole Aromatic amines such as phenylenediamine, o-, m-, p-xylylenediamine, 3,5-diaminochlorobenzene and aniline; cycloalkane polyamines such as 1,3-bis (aminomethyl) cyclohexane; polyethyleneimine And cyclic imine polymers such as polypropyleneimine, poly-3-methylpropylimine and poly-2-ethylpropylimine; and polymers of unsaturated amines such as polyvinylamine and polyallylamine. It is also possible to copolymerize unsaturated amines such as vinylamine and allylamine with unsaturated amines such as dimethylacrylamide, styrene, methyl acrylate, methyl methacrylate, acrylic acid, methacrylic acid, styrene sulfonic acid, and salts thereof. Copolymers with other monomers having a saturated bond are also included. These can also use a mixture of 2 or more types.

  The compound in which a dithioacid group or a salt thereof is introduced into the amino compound may be a compound having only a dithiocarbamate group (acid type functional group), a compound having only a dithiocarbamate group (salt type functional group), an acid, It may be one having both a functional group of a mold type and a functional group of a salt type. Also, a compound having only an acid type functional group, a compound having only a salt type functional group, and a mixture of two or more of an acid type functional group and a salt type functional group can be used. Examples of the salt-type functional group include barium salt, sodium salt, potassium salt, calcium salt, magnesium salt, amine salt and the like, but sodium salt and potassium salt are usually preferable. Such a compound can be obtained by reacting an amino compound with carbon disulfide, and the reaction between the amino compound and carbon disulfide is performed in the presence of an alkali or after treatment with an alkali, It can be set as the compound which has a salt type functional group.

  In the present invention, among the above sulfur compounds, carbon disulfide, sodium sulfate (bow glass), sodium sulfide, sodium hydrogen sulfide (sodium hydrosulfide), sodium thiosulfate, sodium sulfite, and sodium hydrogensulfite are preferable.

  As phosphorous acid used in the present invention, phosphorous acid and phosphite are used. Examples of phosphites include sodium phosphite, potassium phosphite, calcium phosphite, magnesium phosphite, ammonium phosphite, sodium hydrogen phosphite, potassium hydrogen phosphite, calcium hydrogen phosphite, Examples thereof include magnesium phosphate. Of these, phosphorous acid, sodium phosphite, and calcium phosphite are preferable. As hypophosphorous acid, hypophosphorous acid or hypophosphite is used. Examples of hypophosphites include sodium hypophosphite, potassium hypophosphite, calcium hypophosphite, magnesium hypophosphite, ammonium hypophosphite, etc. Sodium phosphite and calcium hypophosphite are preferred. Phosphorous acids and hypophosphorous acids may be used as a mixture of two or more.

  Alkali compounds include alkali metal hydroxides such as lithium hydroxide, sodium hydroxide and potassium hydroxide, and alkaline earth metal hydroxides such as beryllium hydroxide, magnesium hydroxide, calcium hydroxide and barium hydroxide. Can be mentioned. Of these, sodium hydroxide, potassium hydroxide, calcium hydroxide, magnesium hydroxide, and barium hydroxide are preferable.

  The use ratio of the sulfur compound to phosphorous acid and / or hypophosphorous acid is preferably 0.01: 99.99 to 99.99: 0.01, more preferably 1:50 to 50: 1. Furthermore, 1: 9 to 1: 1 is preferable. The ratio of the alkali compound used is preferably 0.1: 9.9 to 9.9: 0.1, preferably 1: 1 with respect to the total amount of the sulfur compound and phosphorous acid and / or hypophosphorous acid. ~ 9: 1 is more preferred.

  In treating the solid waste by the method of the present invention, the above-mentioned sulfur compound, a compound selected from phosphorous acid and hypophosphorous acid, and an alkali compound are added to the solid waste, and the heat treatment is performed. The total amount of sulfur compounds, phosphorous acids, compounds selected from hypophosphorous acids and alkali compounds added to the solid waste is preferably 0.1 to 50% by weight, preferably 0.1 to 50% by weight. More preferred. The compounds selected from sulfur compounds, phosphorous acids, hypophosphorous acids, and alkali compounds may be added separately or mixed at the same time. As addition methods, sulfur compounds, phosphorous acids, hypophosphorous acids, alkali compounds are added and mixed as they are, methods are added and mixed as they are, and then water is sprayed, or sulfur compounds, phosphorous acids, Examples thereof include a method of spraying an aqueous solution or suspension of phosphorous acid or an alkali compound. The heating temperature is preferably 500 ° C. or less, more preferably 50 to 400 ° C., and still more preferably 100 to 350 ° C. As a heating method, a method such as heating by an open flame such as a burner or using an electric furnace in a single furnace such as a square kiln, a round kiln, a ring kiln, a semi-continuous or continuous kiln such as a tunnel kiln or rotary kiln, etc. However, it is preferable to treat in a semi-continuous or continuous kiln such as a tunnel kiln or rotary kiln. The heat treatment time is preferably 30 minutes to 1 hour.

  The reclamation method of the waste landfill treatment plant of the present invention excavates the landfill waste of the waste landfill treatment plant where the solid waste is landfilled, and the excavated landfill waste includes the above phosphorous acids and hypophosphorous acids. The selected compound, sulfur compound and alkali compound are added and heat-treated. As a method of adding a compound selected from phosphorous acid and hypophosphorous acid, and a sulfur compound and an alkaline compound to the excavated waste, a sulfur compound, phosphorous acid, hypochlorous acid, A compound selected from phosphoric acids and an alkali compound are added, mixed while excavating in a backhoe, and sorted with rubble, etc. Examples thereof include a method of adding a compound selected from phosphoric acids and hypophosphorous acids, and an alkali compound. Whether the compound selected from phosphorous acid and hypophosphorous acid, sulfur compound, alkali compound is added as it is, whether to spray water after addition, or spray as an aqueous solution or water suspension is the above-mentioned solid waste As in the case of the process, it can be arbitrarily selected.

  Examples of organic halides that can be treated by the method of the present invention include dioxin, PCB, ethylene chlorohydrin, allyl chloride, ethyl chloride, vinyl chloride, benzyl chloride, methyl chloride, methylene chloride, chlornaphthalene, chloropropylene, chlorbenzol. Chloroprene, acetylene tetrachloride, ethane tetrachloride, carbon tetrachloride, dichlorethane, dichlorbenzol, trichlorethylene, carbon fluoride chloride, brombenzol, bromoform, hexachloroethane, phosgene and the like. Examples of heavy metals include lead, cadmium, hexavalent chromium, arsenic, selenium, mercury, nickel, molybdenum, antimony, copper, zinc, and manganese. Examples of the solid waste to be treated in the present invention include fly ash, main ash, slag, sludge, and soil.

Hereinafter, the present invention will be described in more detail with reference to examples.
Examples 1-5, Comparative Example 1
Per 100 g of fly ash having a dioxin (DXNs) content of 4300 pg-TEQ / g and a Pb content of 1900 mg / kg, a sulfur compound shown in Table 1, a compound selected from phosphorous acid and hypophosphorous acid, and an alkali compound And heated at 400 ° C. for 1 hour using a rotary kiln. The residual amount of dioxins in the fly ash after the treatment and the Pb elution amount from the fly ash after the treatment were measured. The results are shown in Table 2.

(Table 2)

Examples 6 to 10, Comparative Example 2
A mixture of 100 g of fly ash having a dioxin (DXNs) content of 3900 pg-TEQ / g and a Pb content of 1200 mg / kg and 300 g of soil not containing the dioxins and Pb was used as a landfill disposal soil covering model. . To 400 g of this soil covering model, a sulfur compound and a compound selected from phosphorous acids and hypophosphorous acid shown in Table 3 were added, and heat-treated at 400 ° C. for 1 hour with a rotary kiln. The residual amount of dioxins in the landfill disposal site covering model after treatment and the amount of Pb elution from the landfill disposal site covering model after treatment were measured. The results are shown in Table 4.

(Table 4)

Claims (4)

A solid waste treatment method, comprising adding a compound selected from phosphorous acid and hypophosphorous acid, a sulfur compound and an alkali compound to a solid waste, followed by heat treatment. The solid waste treatment method according to claim 1, wherein the heat treatment is performed at a temperature of 500 ° C. or less. Excavation of landfill waste at a landfill disposal site where solid waste has been landfilled, and adding the compound selected from phosphorous acid and hypophosphorous acid, sulfur compounds and alkali compounds to the excavated waste, and heating A method for reclaiming a waste landfill treatment site, characterized by processing. The method for reclaiming a waste landfill treatment plant according to claim 3, wherein the heat treatment is performed at a temperature of 500 ° C or lower.