In this thesis, the formation of ferrihydrite by the iron electrocoagulation (Fe-EC) technology was investigated, focusing on the impact of process conditions such as pH and oxygenation (Chapter 2), as well as the composition of the electrolyte (Chapter 3). The objective was to enhance the removal of contaminants by generating a rust phase (ferrihydrite) with maximum adsorption capacity. Moreover, the influence of local high pH regions on the cathode surface, due to the evolution of H2 and OH- ions, was further examined through recrystallization studies under highly alkaline conditions and in the presence of Fe(II) (Chapter 4).....@en