Study on purification of aspirin simulated wastewater by three-dimensional electrode method

The three-dimensional electrode method was used to treat aspirin (ASP) simulated wastewater. The discharge voltage, treatment time, the amount of activated carbon added and the pH of the treated wastewater stock solution were taken as control variables to explore the treatment effect of ASP wastewater under different conditions. The optimal conditions for ASP wastewater treatment were simulated by Design-Expert. The simulation results show that, taking COD removal rate as the index of ASP wastewater treatment, the optimal scheme is the electrolytic voltage 34.18V, the filling capacity of modified activated carbon 16.78g, the electrolytic time 118.37 min, the pH of treatment waste liquid 5.89, and the theoretical removal rate 101.46%. The actual experiment shows that the COD removal rate is 93.33% under the conditions of electrolytic voltage 36 V, filling amount of modified activated carbon 17 g, electrolytic time 120 min, and pH of waste liquid 6.Taking turbidity as a measure of ASP wastewater treatment index, the optimal scheme is the electrolytic voltage of 33.58V, the filling capacity of modified activated carbon of 13.25g, the electrolytic time of 43.13 min, the pH of treated waste liquid of 6.59, and the theoretical turbidity removal rate of 98.9861%. The actual verification shows that the two indexes of COD and turbidity removal rate are 88.34% and 93.84% respectively under the optimal condition. This study provides a new idea for the treatment of pharmaceutical wastewater.