• RSM;
  • dairy wastewater;
  • electrochemical;
  • COD removal;
  • aluminum electrode


This study reports results of electrochemical treatment to the synthetic dairy wastewater using aluminum electrode. Response surface methodology with four factors and five level full factorial central composite design has been used to design the experiments. Four operational parameters, namely current density (J): 61.73–308.64 A/m2; dosage of sodium chloride (NaCl) (m): 0–2 g/l; electrolysis time (t): 10–90 min and initial pH (pHo): 5–11, have been taken as input parameters and percentage chemical oxygen demand (COD) removal (Y1) and the specific energy consumed (kWh per Kg of COD removed, Y2) have been taken as responses of the system. Multiresponse optimization technique has been applied to find values of operational parameters which maximize the Y1 and simultaneously minimize Y2. The optimum values of operational parameters were found to be J = 123.46 A/m2, m = 2.0 g/l, t = 74 min, and pHo = 6.5. Optimum Y1 and Y2 were found to be 70.91% and 1.32 kWh/kg COD removed. © 2010 American Institute of Chemical Engineers AIChE J, 2011