DEVICE AND METHOD FOR DETERMINING ADDITIVE AMOUNT OF CHELATE AGENT

• Main Authors: ITO ICHIRO, FUJIYOSHI NAOAKI, MIZUSHINA KEIICHI
• Format: Patent
• Language: English; Japanese
• Published: 11.04.2016
• Subjects: DISPOSAL OF SOLID WASTE; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PERFORMING OPERATIONS; PHYSICS; RECLAMATION OF CONTAMINED SOIL SOIL; TESTING; TRANSPORTING

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 【課題】飛灰等の廃棄物中の重金属の不溶化に必要な薬剤添加量を、正確に見積もる。【解決手段】本発明に係る装置１は、廃棄物中の重金属及びキレート剤の反応において未反応のキレート剤と、金属化合物との反応生成物であるキレート化金属の含有量を測定可能な波長で、試料の吸光度を測定する吸光度測定手段２と、この測定結果に基づいて、処理に必要なキレート剤の量を算出するキレート剤量算出手段３とを備える。また、本発明に係る方法は、重金属含有廃棄物にキレート剤を過剰量添加し、重金属を不溶化するキレート剤添加工程Ｓ１と、試料に金属化合物を添加し、未反応のキレート剤でキレート化する金属化合物添加工程Ｓ４と、この工程によるキレート化金属の含有量を測定可能な波長で、試料の吸光度を測定する吸光度測定工程Ｓ５と、この測定結果に基づいて、廃棄物の処理に必要なキレート剤の量を算出する、キレート剤量算出工程Ｓ６とを含む。【選択図】図２