Comparison between laboratory and field leachability of MSWI bottom ash as a road material.
The leaching properties of bottom ash from municipal solid waste incineration (MSWI) used as an aggregate substitute in unbound pavement layers are evaluated. The mechanical behaviour of bottom ash is acceptable for this application, but the potential environmental consequences constitute the most important limitation on the use of bottom ash as a road material. The environmental properties of bottom ash are assessed by means of the Dutch availability test NEN 7341 and the single-batch and two-stage batch European EN 12457 laboratory leaching tests. Furthermore, an experimental unbound pavement stretch is constructed to provide information on leaching behaviour under field conditions. In this high infiltration scenario, the results from predicted (based upon laboratory leaching tests) and measured releases (under field conditions) are compared, evidencing that predictions based on compliance leaching tests may be highly realistic. The depletion period of the extractable fraction of a number of elements in these field conditions is also quantified.
Izquierdo
Maria
M
Institute of Earth Sciences Jaume Almera, Consejo Superior de Investigaciones Cientificas, C/Lluís Solé i Sabarís s/n, 08028 Barcelona, Spain. mariaizq@ija.csic.es
Querol
Xavier
X
Josa
Alejandro
A
Vazquez
Enric
E
López-Soler
Angel
A
D003252:Construction Materials; D004553:Electric Conductivity; D004784:Environmental Monitoring; D004785:Environmental Pollutants / Q000032:analysis* / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D017745:Incineration; D012037:Refuse Disposal / Q000379:methods*; D053260:Soot / Q000032:analysis* / Q000737:chemistry; D014186:Transportation
D004785:Environmental Pollutants; D053260:Soot