| Abstract |
| In this study, we investigated the removal of P in aqueous solution using thermally treated crushed concrete under dynamic flow condition. Column experiments were performed in step injection mode under various conditions of influent P concentration (2.0-4.0 mg/L), flow rate (0.4-1.0 mL/min), and column length (5-15 cm). The breakthrough curves (BTCs) obtained from column experiments were fitted to Adams-Bohart, Thomas, Yoon-Nelson, and Dose-response kinetic models. The highest column capacity for P removal (q0) of 3.085 mg/g and removal percentage (Re) of 66.4% were achieved using an influent P concentration of 3.0 mg/L, flow rate of 0.4 mL/min, and column length of 10 cm. Increasing the P concentration and flow rate had a negative effect on Re, whereas the increase of column length was positively affected. Increasing flow rate and column length produced a negative effect on q0. The flow rate in the range of this study influenced on the performance of column more significantly than other two factors. Adams-Bohart model adequately fitted to the initial part of the BTCs, whereas the Thomas and Yoon-Nelson models were appropriate for describing the transient stage of the BTCs between the breakthrough point and saturation point. Theoretical q0 obtained from Thomas model and time required for 50% breakthrough of P (τ) obtained from Yoon-Nelson model were very close to experimental values. This study demonstrates the adequate performance of thermally treated crushed concrete as a filter material for the removal of P from aqueous solutions |
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| Key Words |
| Phosphorus, Crushed concrete, Kinetic model, Column experiment, Adams-Bohart model |
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