Abstract
This work shows results obtained in the incineration of 1 mM indigo textile dye (536 ppm COD) in 0.05 M NaCl aqueous media (which resembles a denim laundry industrial wastewater). Microelectrolysis and macroelectrolysis studies indicated that oxidation of indigo dye was carried out via hydroxyl radicals (OH{radical dot}) formed by water oxidation on the BDD surface, instead of active chlorine as usually occurs by using DSA. Electrolyses in a FM01-LC reactor was performed at Reynolds between 1600 < Re < 18300, and a fixed current density of 5.3 and 15 mA cm-2. The experimental set-up achieved 100% efficiency in color removal, indigo mineralization and current efficiency. Estimated energy consumption, at Re = 12892 and J = 5.3 mA cm-2, was 9 kWh m-3. Experimental data revealed that hydrodynamic conditions do not influence either the indigo degradation rate or the current efficiencies; therefore indigo degradation must involve a complex mechanism.
Original language | English |
---|---|
Pages (from-to) | 6888-6894 |
Number of pages | 7 |
Journal | Electrochimica Acta |
Volume | 52 |
Issue number | 24 |
DOIs | |
State | Published - 1 Aug 2007 |
Keywords
- BDD electrodes
- Degradation of organics
- Denim wastewater
- FM01-LC reactor
- Indigo dye