Performance Evaluation of Calcined Meretrix lusoria Beads Fixed Bed Column for Instantaneous Removal of Phosphate and Nitrate from Domestic Wastewater
2022
Daudzai, Zubaida | Dolphen, Rujira | Thiravetyan, Paitip
In our previous work, efficient PO₄³⁻ and NO₃⁻ adsorption by calcined Meretrix lusoria powder was reported. This study addressed pilot-scale application of M. lusoria F800 for PO₄³⁻ and NO₃⁻ removal from the real site. The study investigated the performance of multicomponent (PO₄³⁻ and NO₃⁻) adsorption from domestic wastewater (DWW) in fixed bed adsorption column packed with Meretrix lusoria F800 beads. Prior the packing, M. lusoria F800 beads were successfully tested for 20 mg/L PO₄³⁻ and NO₃⁻ removal from synthetic wastewater (SWW) and DWW, respectively. In this research study, the effect of the column operational parameter including DWW influent flow rate (Q: 10, 30, and 40 mL/min) and adsorbate concentration (C: ≈ 60 mg/L) on breakthrough curves was well-evaluated. Thomas model was used to confirm the correlations of the experimental data with the maximum adsorption capacity of 23.6 mg/g PO₄³⁻ and 9.31 NO₃⁻ mg/g, at 10 mL/min flow rates, respectively. Results demonstrated that Thomas model well interpreted the experimental data. Moreover, PO₄³⁻ and NO₃⁻ removal capacity by regenerated M. lusoria F800 beads was observed additional adsorption cycle. Furthermore, scale-up column was successfully tested, where experimental values were in parallel with theoretical values. In conclusion, this study indicates that M. lusoria F800 beads can be economically and easily utilized in a fixed bed adsorption column for the removal of PO₄³⁻ and NO₃⁻ from DWW containing excessive PO₄³⁻ and NO₃⁻.
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