Hi Has anyone treated the wastewater of alcohol production units (specially ethanol units) with advanced oxidation methods?

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Bruno Peeters

Using advanced oxidation (AO) directly on raw vinasse (wastewater from ethanol production) makes no sense because this would be terribly inefficient and prohibitively expensive especially in operating cost (mainly energy).

Although ozone O3 based AO after conventional anaerobic digestion is a bit more efficient at 70%-75% overall COD removal it remains very expensive as shown in many papers including one published in Research Gate in 2013 at

Conference Paper Integrated biological and advanced oxidation treatment of Cu...

According to my/our 40 years full scale experience worldwide, the most sustainable and cost-effective solution is maximum anaerobic biological conversion to green energy (biomethane) followed by advanced aerobic biological conversion to clean (blue) water with ozone based AO as optional post treatment. Depending on the feedstock of the ethanol production (grains, fruits, molasses, ....) and on the COD of the raw vinasse (distillation), overall COD removal rates up to 99% have been achieved with 100% biological conversion.

Vit Mateju

I completely agree with the answer of @Bruno Peeters´s. We have experience with the full-scale application of Fenton´s oxidation. The choice of an oxidant depends upon the composition of pollutants to be removed from wastewater. In some instances, ozone is the best solution in another the Fenton´s oxidation could be the best.

REgards

Vit