Optimization of waste stabilization pond performance for piggery waste treatment using response surface methodology


  • Benjamin Ugochukwu Okoro Nnamdi Azikiwe University, Awka
  • Nkiruka E Nwaiwu Department of Civil Engineering, Nnamdi Azikiwe University, Awka




Wastewater, Box-Behnken, Optimum, Treatment, Waste stabilisation pond.


The treatment of piggery wastewater using the waste stabilisation pond was studied in a semi- continuous process. Optimization of Chemical Oxygen Demand (COD) removal was conducted using response surface methodology where pH, temperature and retention time were independent variables. The Box-Behnken design approach, an experimental design was used for creating set of experimental runs needed for optimizing COD removal. An attempt was also made to optimize COD removal by reducing hydraulic retention time while maintaining pH and temperature of a defined range. Analysis of variance (ANOVA) was conducted on model terms and the results revealed that the coefficient of determination value (R2) of % COD removal was 0.86, 0.88, and 0.86 for the anaerobic, facultative and maturation pond respectively. Highest desirability was obtained for optimum COD % removal and this was 0.89, 0.89 and 1.0 for ponds.The waste stabilisation pond treatment process can effectively be improved on for piggery wastewater treatment.

DOI: http://dx.doi.org/10.5755/j01.erem.73.2.17696

Author Biographies

Benjamin Ugochukwu Okoro, Nnamdi Azikiwe University, Awka

Research Student, Department of Civil Engineering.

Nkiruka E Nwaiwu, Department of Civil Engineering, Nnamdi Azikiwe University, Awka

Professor, Water and Environmental Engineering, Department of Civil Engineering, Awka.