Prediction Model for the Treatment of Stabilized Oily Wastewater by Modified Induced Air Flotation (MIAF)

Abstract

Abstract. The objective of this study is to propose a prediction model for characterizing stabilized oily-wastewater that has been treated using Induced Air Flotation (IAF) and Modified Induced Air Flotation (MIAF), which is a combination of coagulation and flotation. Wastewater samples containing an anionic surfactant at the critical micelle concentration (CMC) were prepared as the stabilized oily-emulsion. The amount of oil as well as the amount removed was measured using COD. The study shows that the coagulant dosage (CAlum), interfacial area (a), and velocity gradient (G) are the important factors that affect flotation performance. Therefore, the proposed model is based on these parameters in terms of the CAlum and a/G ratio. The maximum removal efficiency and the reduction of the COD values can be predicted for any of the operating conditions. It was found that predicted oily wastewater efficiency and removal kinetic were compatible with those obtained from experiments. The discrepancy of 5% between the results from the prediction and the experiment can be found.

Characterization and Innovative Process of Oily Wastewater from Substations

“…The vortex concave air otation machine exhibits a strong adaptability to changes in wastewater quantity and water quality. By adjusting the height of the e uent weir easily, it can adapt to varying circumstances [14].…”