Effect of organic load of refinery wastewater in municipal wastewater treatment using bench scale extended aeration activated sludge system

• Main Authors: Amin, M.A.R.M.M., Kutty, S.R.M., Isa, M.H.
• Other Authors: Brebbia, C.A.
• Format: Book Section
• Published: WIT Press 2011
• Subjects: TD Environmental technology. Sanitary engineering
• Online Access: http://eprints.utp.edu.my/6484/1/Effect_of_organic_load_of_refinery_wastewater_in_municipal_wastewater_treatment_using_bench_scale_extended_aeration_activated_sludge_system.pdf; http://eprints.utp.edu.my/6484/

Petroleum refinery wastewater has the characteristics of a high concentration of aliphatic and aromatic petroleum hydrocarbons, which could lead to heavy pollution to the environment. In this study, petroleum refinery wastewater was co-treated with municipal wastewater in continuous flow bench scale reactors. Two bench scale reactors, A and B each of liquid volume of 18 L treats municipal wastewater and a mixture of municipal and refinery wastewater, respectively. The flow rate, Q for both reactors was maintained at 9 L/day with the hydraulic retention time (HRT) and sludge retention time (SRT), set at 2 days and 40 days, respectively. Food to microorganism (F/M) ratio, concentration of effluent soluble chemical oxygen demand (sCOD), mixed liqour suspended solids (MLSS), and mixed liquor volatile suspended solids (MLVSS) were monitored throughout the study period. The result of a full five months operation show high removal efficiencies of organic matter of about 90% as sCOD with 30% loading of the refinery wastewater.