Road soil retention of Pb leached from MSWI bottom ash.
Municipal solid waste incinerator (MSWI) bottom ash may be used as a road construction material; it potentially contains however a sizable quantity of heavy metals, which under the effect of rainfall infiltration through the road structure can be leached out from the material and infiltrate into the underlying soil. An eco-compatibility assessment of MSWI bottom ash reuse in road construction applications necessitates examining the solubility and retention of heavy metals in road soils. This study is dedicated to Pb transfer, sorption and desorption (NEN 7341 standard test) within various soils. These experiments yield results relative to the interaction between road soils and an MSWI bottom ash leachate representative of a "fresh" product, with a high leaching potential. For the soils investigated, the sorption of lead varies between 90% and 99%. For an extraction at pH 7, Pb release is very low (<2%) for all soils, while at pH 4 leaching varies between 4% and 47%. This work shows that Pb may be fixed by some types of road soil in mostly stable forms.
Bouvet
M
M
Laboratoire Central des Ponts et Chaussées, Route de Bouaye, BP 4129, 44321 Bouguenais, France.
François
D
D
Schwartz
C
C
D003247:Conservation of Natural Resources; D003252:Construction Materials; D004784:Environmental Monitoring; D017745:Incineration / Q000379:methods*; D007854:Lead / Q000737:chemistry*; D012987:Soil / Q000032:analysis; D012989:Soil Pollutants / Q000737:chemistry; D014874:Water Pollutants, Chemical
D012987:Soil; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; D007854:Lead