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Degradation of the industrial dyes, Blue BR (BBR) 200 mg/L and Black TRS (BTRS) 100 mg/L, has been studied by the electro-Fenton/BDD process (EF/BDD). Each dye was tested in 0.05 mM Na₂SO₄ with 0.5 mM Fe²⁺ at pH 3.0 and in NaCl 0.05 mM, and electrolyzed in an undivided BDD/BDD flow reactor under galvanostatic conditions with 8, 15 and 31 mA/cm². Dyes were oxidized via hydroxyl radicals (^{radical dot}OH) formed at the BDD anode from water oxidation coupled with Fenton’s reaction cathodically electrogenerating hydrogen peroxide (H₂O₂). Under Na₂SO₄ medium a 78% decolorization is achieved and an almost 90% under NaCl. Through the color abatement rate the dyes behavior was analyzed at the beginning of the oxidation process. Dissolved Organic Carbon (DOC) was tested to evaluate the degradation. From DOC removal, it was established an increasing relative oxidation power of the EF …