Abstract

DAVILA RINCON, Javier; MACHUCA MARTINEZ, Fiderman  and  MARRIANGA CABRALES, Nilson. Using electro-flotation/oxidation for reducing chemical oxygen demand, total organic carbon and total solids in vinasses. Ing. Investig. [online]. 2009, vol.29, n.1, pp.35-38. ISSN 0120-5609.

The high chemical oxygen demand (COD) of vinasses from ethanol distilleries (greater than 130,000 mg/L) has led to exploring alternative treatments enabling their final disposition. The electro-flotation/oxidation of vinasses was thus experimentally evaluated regarding initial pH, electrolytic support (NaCl) and hydrogen peroxide concentration (H₂O₂), current density (CD) and several electrodes: iron, aluminum and galvanized steel. Its effect on reducing COD and total organic carbon (TOC) was studied, an initial 214,000 ppm COD value being reduced to 90,000 ppm, thereby representing a 58% reduction. The greatest reductions were achieved with galvanized steel electrodes, basic pH, 20 mA/cm² and 60,000 ppm H₂O₂.

Keywords : vinasse; electro-flotation; electro-Fenton; electro-oxidation; COD; TOC.

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