Leaching behavior of elements in recycled roadbed material using solidified boiler fly ash

抄録

Waste incinerated fly ashes are considered hazardous waste worldwide. Current research focuses on the potential recycling of incinerated materials through cement solidification. The problem with this technique is the potential leaching of hazardous content when material is contact with water. In that sense leaching characterization and quantification from the material is needed for short and long-term application scenarios. In this research a multidisciplinary approach combining mineralogical analysis with different leaching tests was performed to predict the mobility of potentially hazardous substances from recycled roadbed aggregate produced from tire waste boiler fly ash. Utilizing the geochemical modeling tools leachate pH controlling mineral phases in the material were predicted and compared to column leaching test results. Results have shown the material high buffer capacity prevents leaching of heavy metals, and its release is solubility controlled.