Evaluation of COD removal from dairy farm wastewater using a sequencing batch reactor (SBR)
Volume Title: 1
1M.Sc. student of water and wastewater laboratory, Chemical Engineering, University of Guilan, Rasht, Guilan, Iran
2گروه پژوهشی مهندسی آب و محیط زیست پژوهشکده حوزه آبی خزر، دانشگاه گیلان، رشت، ایران
3Associate Professor, Faculty of engineering, Department of chemical engineering, University of Guilan, Rasht, Guilan, Irran
4Postdoctoral Fellow, Faculty of sciences, Department of chemistry, University of Guilan, Rasht, Guilan, Iran
The dairy Farm wastewater (DFW) contains high concentration of organic matter, solids and nutrients. Therefore, treatment of this contaminated water is essential. In this study, removal efficiency of chemical oxygen demand (COD) using a sequencing batch reactor (SBR) was studied in a bench-scale set-up. DFW samples were collected with COD of 3100 mg/L. The effect of excess nutrients on biomass growth and COD reduction was investigated, as well as the effect of mixed liquor suspended solids (MLSS) concentration on the COD removal. At optimal conditions, including initial organic loading rate (OLR) of 2.93 Kg COD/m3d, MLSS of 4500 mg/L and hydraulic retention time (HRT) of 24 h, 80% of COD removal was observed, approximately.