Several studies have reported the adverse effects of recalcitrant compounds and emerging contaminants present in industrial effluents, which are not degradable by ordinary biological treatment. Many of these compounds are likely to accumulate in living organisms through the lipid layer. At concentrations above the limits of biological tolerance, these compounds can be harmful to the ecosystem and may even reach humans through food chain biomagnification. In this regard, advanced oxidation processes (AOPs) represent an effective alternative for the removal of the pollutants. This study focused on the AOP involving the use of ultraviolet radiation in homogeneous and heterogeneous systems. Based on the literature review, comparisons between natural and artificial light were established, approaching photoreactors constructive and operational characteristics. We concluded that the high availability of solar power in Brazil would make the implementation of the AOP using natural solar radiation for the decontamination of effluents feasible, thereby contributing to clean production and biodiversity conservation. This will serve as an important tool for the enforcement of environmental responsibility among public and private institutions.
Resumo: A necessidade de se dar um destino adequado às peles, subproduto do processo de filetagem, motivou o desenvolvimento do processo de curtimento de peles de peixe. Este processo consome grande quantidade de água e consequentemente, gera volumes elevados de efluentes líquidos, os quais devem ser tratados adequadamente. Desta forma, o objetivo deste trabalho foi avaliar o efeito da presença de Fe +2 em solução na degradação do efluente da etapa de tingimento de peles de peixe por fotocatálise usando Nb2O5 suportado em zeólitas NaX e NaA. Catalisadores suportados com 5 e 10% (% mássica) de Nb2O5 foram preparados pelo método da impregnação úmida e caracterizados por análise textural, DRX e espectroscopia fotoacústica. Os testes consistiram em irradiar 300 mL do efluente com ou sem 1 g L -1 do catalisador durante 3, 6 e 10 h na presença de 40 mg de Fe +2 em solução. Os resultados mostraram redução na turbidez do efluente e aumento significativo na
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