engleski

Modeling the Phosphate Dynamics During Electrocoagulation Process with Aluminum Electrodes

The efficiency of the electrocoagulation (EC) process for the removal of phosphate (PO4-P) is analyzed using a batch pilot device with aluminum electrodes situated within the reactor. The effects of the flow rate through the reactor (0.05 L/s and 0.15 L/s), applied current density at the electrodes (30 i 75 A/m2) and batch mixture volume (90 and 180 L) were the focus of the research. The initial PO4-P concentration is the same in all experiments (3.8 mg PO4-P / L). The concentrations of PO4-P, dissolved oxygen (DO) and aluminum (Al3+), as well as the water temperature and pH, were measured in the batch chamber. The initial PO4-P concentration is reduced by 90% after 90 min of reactor operation when the flow rate is set as 0.15 L/s and the initial NaCl concentration is 2 g/L, while the current density is maintained at 75 A/m2. The DO concentration is reduced by 15%, while pH is enhanced by 10% with respect to the initial values. Additionally, a three- dimensional (3D) numerical model for PO4-P removal via the EC process is developed. By using the 3D numerical model, spatially continuous velocity fields and the PO4-P concentration were determined. Numerical model of PO4-P transport includes the processes of phosphate adsorption on flocculent, along with coagulated particles settling. Numerical model parametrization relies on the measurement results from the experiments made on batch pilot device.

electrocoagulation, pilot device, numerical model, ammonia

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