Development of the Acid Treatment and Risk Assessment Protocol for the Stabilization of Fly Ash from a Waste Incinerator
- Development of the Acid Treatment and Risk Assessment Protocol for the Stabilization of Fly Ash from a Waste Incinerator
- 남궁형규; 이관형; 이재우; 윤창노; 유영화; 송지현
- waste incinerator; fly ash; risk assessment
- Issue Date
- 2nd Symposium of Asian Regional Branch of International Waste Working Group
- , 76-80
- For hazardous wastes, a combined method to reduce toxicity and protocol to assess risks to
human is required for disposal or recycling. However, most treatment technologies have been developed to reduce toxicity from hazardous wastes, and further evaluation to validate risk levels have not been inclusively considered during and after the treatment processes. In this study, a treatment technology and a risk assessment tool for a hazardous waste were combined to evaluate how much the risk level was reduced after the treatment. As a model study, fly ash from a domestic solid waste incinerator was treated by an acid stabilization method to reduce a leachate concentration of lead to below the Korean standard of 3 mg/L. In addition, a risk assessment based on exposure estimation (RAEE) was implemented to calculate a risk index. The lead leachate concentration from the fly ash used in this study was 39.5 mg/L that was much higher than the Korean standard, and its normalized risk index was estimated to be 93. At the acid and lead molar ratio of 4, the lead removal efficiency was found to be 96.5%. At the experimental condition, the risk index was 3.2 and the leachate concentration dropped to below the standard. The phosphoric acid treatment showed an efficient stabilization effect depending on an acid and lead molar ratio. Consequently, the combined protocol was applied to technically reduce the lead toxicity of the hazardous waste and to clearly indicate how much the risk level was dropped; therefore, the protocol is a useful tool to make a decision whether a waste can be
safely disposed and recycled.
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