| 摘要 |
PROBLEM TO BE SOLVED: To provide a safe insolubilization treatment method for heavy metal elements in waste capable of fixing heavy metal elements in various wastes, soil/bottom material and wastewater containing harmful heavy metals such as cadmium, zinc, copper, mercury, lead, arsenic, selenium, nickel or the like to stabilize them so as not to generate the re-elution of them over a long period of time and not deteriorating a work environment. SOLUTION: A thiosulfate compound, a solution thereof or a waste liquid containing a thiosulfate compound is added to a pollutant such as industrial waste, urban refuse, incineration ash, soil/bottom substance or wastewater containing heavy metals so that the amount of the thiosulfate compound becomes five times or more in a molar ratio with respect to the content of heavy metals in the pollutant and, if necessary, water is further added thereto and the resulting mixture is stirred and mixed at the normal temperature. Alternatively, the mixture is heat-treated at 95-120°C for 5-36 hr. By this constitution, heavy metal elements in the pollutant are fixed. COPYRIGHT: (C)2003,JPO
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