A method for decomposing and eliminating dioxins contained in flyash at a lower temperature and in a shorter time is provided, in which dioxins or dioxins-containing materials are brought into contact with amine compounds and/or ammonium compounds at a temperature lower than 300.degree. C. Chlorine in dioxins reacts with amine compounds and/or ammonium compounds and thus the dechlorination or replacement reaction of dioxin quickly proceeds under lower temperature. The method makes it possible to decompose dioxins under low temperature range in which dioxins have been thought to be undecomposable.
White rot fungi capable of decomposing dioxin were screened from rotten wood to isolate the MZ-340 strain. This MZ-340 could be cultured in the Kirk liquid medium (HCLN) or PDB medium. New systems that can be used to decompose dioxins in incineration ash were constructed using this MZ-340 strain. The present invention can decompose dioxins in incineration ash effectively and efficiently in both solid phase systems and liquid phase systems. Thus, the present invention enables the prevention of environmental pollution by dioxins generated during incineration and also the clean up of dioxin pollutants.
A method for decomposing and eliminating dioxins contained in flyash at a lower temperature and in a shorter time is provided, in which dioxides or dioxins-containing materials are brought into contact with amine compounds and/or ammonium compounds at a temperature lower than 300 .degree. C. Chlorine in dioxines reacts with amine compounds and/or ammonium compounds and thus the dechlorination or replacement reaction of dioxin quickly proceeds under lower temperature. The method makes it possible to decompose dioxins under low temperature range in which dioxins have been thought to be undecomposable.
The present invention relates to a method of decomposing organochlorine compounds such as dioxins reductively or catalytically. The organochlorine compounds such as dioxins and o-chloroanisole are decomposed in an aqueous alkali solution in the presence of a reducing agent or a catalyst. The alkali which can be used is at least one selected from the group consisting of sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate and aqueous ammonia. The reducing agent which can be used is at least one selected from the group consisting of sodium hydrosulfite, ascorbic acid, hydrazine, hydrazine hydrate, neutral hydrazine sulfate, hydrazine carbonate, sodium thiosulfate, sodium sulfite, potassium sulfite, hydroquinone, 4-methylaminophenol sulfate and Rongalite. The catalyst which can be used is at least one selected from the group consisting of activated carbon and titanium oxide.
A process for the wet processing of a dioxin-containing material, wherein the material is contacted with an aqueous solution, acidified with hydrochloric acid and containing a catalyst dissolved therein, at a temperature lower than 100.degree. C. to decompose the dioxins into harmless substances with a decomposition rate of at least 60%.
A method of treating fly ash and fly ash treated thereby, the method involving contacting ammonia-laden fly ash with an organic base-containing treatment composition, where the organic base causes the ammonia within the fly ash to evolve from the fly ash. The treatment composition preferably includes an effective amount of one or more amines. The treatment compound may be applied to the fly ash in any manner effective to disperse the treatment compound among the fly ash.
