Irizarry-Figueroa, Eileen E.

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    Development of ternary relationships among soil characteristics, CAAs amount, and groundwater quality: column percolation
    (2012) Irizarry-Figueroa, Eileen E.; Hwang, Sangchul; College of Engineering; Bogere, Moses N.; Camacho Padrón, Beatriz I.; Department of Civil Engineering; Román Paoli, Elvin
    Coal ash aggregates (CAAs) from a coal power plant was evaluated for use as a backfilling substitute in open pit restoration. The restoration was successfully simulated under laboratory conditions by using three dissimilar soils with factorial design combinations of CAA volumetric amount. The applicability of CAAs in different soil types was assessed. Better understanding of CAAs applicability in different soil types was provided by this study. In addition, was established how dissimilar interactions between CAAs and soils can affect groundwater quality. A statistical 3 3 factorial design was used to evaluate interactive effects of top soil types, top soil to CAA ratio, and sub soil types on water quality parameters such as turbidity, conductivity, pH and hardness. Studies of toxicity and heavy metal concentrations were also made to ensure a safe application of CAAs to soil and groundwater environments. Best results in terms of water quality were obtained from the combination of top soils with less amount of CAAs and clayey sub soils. A toxicity test showed the absence of acute toxicity, and heavy metal concentrations were below the Maximum Contaminant Levels established by the U.S. Environmental Protection Agency.