Material and Site Specific Partition Coefficients for Beneficial Use Assessments

Material and Site Specific Partition Coefficients for Beneficial Use Assessments
정재식Nawaf I. BlaisiKyle ClavierJustin RoesslerTimothy G. TownsendSouhail R. Al-AbedJean-Claude J. Bonzongo
coal combustion fly ash; dilution attenuation factor; leachate; partitioning coefficient; waste to energy bottom ash
Issue Date
Environmental science & technology
Partition coefficients (Kd) available in the literature are often used in fate and transport modeling conducted as part of beneficial use risk assessments for industrial byproducts. Since element partitioning depends on soil properties as well as characteristics of the byproduct leachate, site-specific Kd may lead to more accurate risk assessment. In this study, contamination risk to groundwater of beneficially reused byproducts was assessed using batch leaching tests on waste to energy bottom ash (WTE BA) and coal combustion fly ash (CFA). Leachates were equilibrated with 8 different soils to obtain the waste-soil-specific Kd,exp for the metals of interest. The Kd,exp values were used as inputs in the Industrial Waste Management Evaluation Model (IWEM) to demonstrate the degree to which Kd estimates affect risk assessment outcome. Measured Kd,exp for the most part fell within the large range of Kd reported in the literature, but IWEM results using default Kd for some types of soils resulted in overestimated risk compared to those derived from Kd,exp. Modeled concentration at the 36 receptor location was much lower for some elements for those soils with high concentrations of iron and aluminum.
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