ABSTRACT To improve the performance of wastewater treatment by electroflotation process, the optimization of the bubble flow regimes within the electroflotation column is required. Two hydrodynamic flow regimes are observed: the homogeneous bubbly flow and the heterogeneous or turbulent flow regimes. This work essentially investigates the effect of the liquid phase pH and current density ( J ) on the hydrodynamic regimes. Meanwhile, optimizing electroflotation flow regimes requires a detailed hydrodynamic analysis of the bubbles, including bubble size ( d B ), ranging from 0.088 to 0.34 mm, bubble rise velocity ( U B ), and gas hold‐up ( Ɛ g ), varying between approximately 1% and 5%. The transition from homogeneous to turbulent flow was observed at a Reynolds number ( Re ) of about 1. Such quantitative information is essential for accurately determining and optimizing the bubble size distribution within the electroflotation column.
Hajlaoui et al. (2026) studied this question.