Removal of chemical oxygen demand from hospital wastewater using electrocoagulation

Abstract

In the present study, electrocoagulation (EC) was applied to treat hospital wastewater. It has been shown that the efficiency of the pollutant removal highly depends on the current density and electrolysis time. A central composite design was used to optimize the EC process and to evaluate the individual and interactions effects of the two factors. The maximum predicted COD removal efficiency were reached 96.1% at 130 A/m² of current density in 9 min electrolysis. The removal efficiency value was agreed well with the experimental value of COD removal (94.6%) under the optimum conditions. These results highlighted the potential of electrocoagulation for pollutant removal of hospital wastewater.