Electrochemical treatment of cetrimonium chloride with boron-doped diamond anodes. A technical and economical approach

This study presents the results of the electrochemical degradation of the emulsifier cetrimonium chloride (CTAC) on a boron-doped diamond (BDD) anode under different current densities and flow rates. Higher values of these parameters result in a more rapid removal. Nevertheless, operation at low current reduces the required applied charge and increases the chemical oxygen demand (COD) removal efficiency, as there is less development of ineffective parasitic reactions. On the other hand, high flow rates reduce the required volumetric applied charge and increase the COD removal current efficiency. In order to assist and enrich the study, an economic analysis has been performed. For short expected plant lifespans, operation at low current is advantageous due to the lower investment required, whereas for longer expected lifespans, the operational costs make the lower current densities less costly. High flow rates are always advantageous from a financial point of view. •Cetrimonium chloride can be effectively degraded on boron-doped diamond.•A rapid degradation can be achieved for higher current densities and flow rates.•Higher efficiencies are attained for lower current densities and high flow rates.•An economic analysis helps to establish the most adequate operating conditions.