Later Stage Release of Heavy Metals from Municipal Solid Waste Incinerator Fly Ash Stabilized with Chelating Agent

概要

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In Japan, stabilization with chemical agents is the prevalent method for controlling the release of heavy metals from fly ash generated at municipal solid waste (MSW) incinerators and MSW melting furnaces. The objective of this study was to investigate the functional capability of chemical agents for long-time release control of metals. Three types of chelating agents were used for the stabilization of fly ash from a MSW incinerator. The stabilized fly ash was aged in 5 kinds of ageing conditions, varying the combination of dehydration and atmosphere, for a maximum of 68 days. Release of metals was evaluated by the Leaching Test proscribed in the Japanese Environmental Agency Notification No. 13, 1973 (JLT-13) .<BR>The experiment proved that only in the wet condition with less than 2% of oxygen gas kept the released concentration of Pb in less than 0.1 mg/L. On the other hand, all of the other conditions overreached the criterien of 0.3 mg/L. Fixed heavy metals might be released after some time periods if the stabilized fly ash is placed in an ineligible condition. At the same time, another behaviour of heavy metals was observed. Independent of chelating agent and atmospheric gas conditions, Pb, Zn and Ca were moderately insolubilized in the wet condition.
一般社団法人廃棄物資源循環学会の論文