DUARTE, D. R.; http://lattes.cnpq.br/7130120597618255; DUARTE, Diego Rodrigues.
Resumo:
Dairy effluents are residues resulting from the processing of milk and its derivatives,
posing a high pollutant potential. Various techniques have been employed to treat these
effluents, with advanced oxidative processes (AOPs) emerging as a prominent
alternative. Among these, the Photo-Fenton process has stood out for its powerful
oxidizing capacity. To optimize treatment, different combinations of hydrogen peroxide
(H2O2) and ferrous sulfate (FeSO4) concentrations were evaluated using a factorial
experimental design. Dependent variables analyzed included Chemical Oxygen Demand
(COD), final pH, total solids, and final conductivity. The study demonstrated a reduction
of approximately 70% in oxidizable compounds, as measured by COD reduction.
Conductivity was reduced by approximately 25%, and a slight reduction in final pH from
3.0 to 2.7 was observed. Photo-Fenton treatment of dairy effluents proved efficient, with
a total reduction of approximately 84% of total organic matter. However, under artificial
light, efficiency decreased by up to 27% compared to natural light. With the association
of the Photo-Fenton process to the adsorption process with activated carbon, applied in
the post-treatment effluent of Foton-Feton, a reduction of up to 94% of organic matter
was observed. Thus, it can be observed that the association of Fenton-photocatalyzed
treatment followed by the adsorption process with commercial activated carbon applied
to dairy effluent treatment promotes a reduction of organic matter in the effluent
exceeding 90%, without causing significant changes in the values of other properties.
