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MSW Incinerator Ash Potential for Reuse

Sarah Mahon, P.E. MSW Incinerator Ash Potential for Reuse. Types of Ash. http://www.fhwa.dot.gov/publications/research/infrastructure/structures/97148/mswca1.cfm. Ash Characteristics. Bottom vs. fly ash Age of plant Air pollution control equipment Pre-sorting Batteries

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MSW Incinerator Ash Potential for Reuse

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  1. Sarah Mahon, P.E. MSW Incinerator Ash Potential for Reuse

  2. Types of Ash http://www.fhwa.dot.gov/publications/research/infrastructure/structures/97148/mswca1.cfm

  3. Ash Characteristics • Bottom vs. fly ash • Age of plant • Air pollution control equipment • Pre-sorting • Batteries • Inks, paints, ceramics

  4. Case Study – Current Ash Reuse • Netherlands, France, Germany, Denmark, England • Coarse aggregate, foundations, road fills, asphalt, construction projects • Some pretreatment (sieving, pulverizing, stabilization) • Restrictions: drinking water protected areas, stormwater catchment areas, distance from groundwater

  5. Public Opposition • Toxicity (lead, cadmium, dioxins) • Toxicity “hot spots” • Aluminum + water  Hydrogen Gas + Spark = EXPLOSION • Long term leaching given localized soil characteristics (TCLP is harsh landfill over short time frame, longer time frames untested) • Management to ultimate destination (loose fly ash)

  6. Conclusions • Areas that reuse ash in landfill-strapped areas • Various reasons for public opposition • US incineration plants currently designed to mix ash waste streams (fly ash + bottom ash), less likely to be reused • Unlikely to move forward without strict regulations regarding reuse

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