DEVICE AND METHOD FOR DETERMINING ADDITIVE AMOUNT OF CHELATE AGENT

摘要

PROBLEM TO BE SOLVED: To accurately estimate an additive amount of chemicals necessary for insolubilization of heavy metal in waste such as fly ash.SOLUTION: A device 1 related to the present invention includes: absorbance measurement means 2 for measuring absorbance of a sample with a wavelength allowing for measurement of a content of a chelated metal which is a reaction product between a metal compound and an unreacted chelate agent remaining unreacted in reaction of heavy metal in waste with the chelate agent; and a chelate agent amount calculation means 3 which calculates the amount of the chelate agent necessary for treatment based on the measurement result. A method related to the present invention includes: a chelate agent addition step S1 of adding an excessive amount of a chelate agent to heavy metal-containing waste thereby insolubilizing heavy metal; a metal compound addition step S4 of adding the metal compound to the sample thereby chelating the metal compound with the unreacted chelate agent; an absorbance measurement step S5 of measuring absorbance of the sample with wavelength allowing for measurement of the content of the chelated metal obtained in the step S4; and a chelate agent amount calculation step S6 of calculating the amount of the chelate agent necessary for treatment of the waste based on the measurement result.SELECTED DRAWING: Figure 2