Transcript Solid Waste Project Presentation.pptx

Sarah Mahon, P.E.
Types of Ash
http://www.fhwa.dot.gov/publications/research/infrastructure/stru
ctures/97148/mswca1.cfm
Ash Characteristics
Bottom vs. fly ash
 Age of plant
 Air pollution control equipment
 Pre-sorting
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 Batteries
 Inks, paints, ceramics
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
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Public Opposition
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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)
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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