Assessing the feasibility of a downstream heterogeneous Fenton process for the oxidative degradation of biologically treated ranitidine, diclofenac, and simvastatin

Autor(es)

da Silva, Thiago H. G. ; Furtado, Rafaely X. S. ; Zaiat, Marcelo ; Azevedo, Eduardo B.

• Tipo de documento: Artigo Científico
• Fonte: CHEMICAL ENGINEERING JOURNAL; v. 467, p. 9-pg., 2023-05-20.

Resumo

This work assesses the feasibility of coupling the heterogeneous Fenton process to biologically treated domestic sewage to remove diclofenac, ranitidine, and simvastatin (50 mu g L-1 each). The catalyst was a purified natural zeolite, which was impregnated with iron (2Fe4A). First, batch tests (10 g L-1 catalyst, 2 g L-1 H2O2, and pH 7) were performed to gather information about the performance of the process. Simvastatin could not be significantly removed as its molecular dimensions were larger than the zeolite pores. Drugs removal by adsorption and mineralization were not observed. After five cycles of 30 h each, leached iron was approximately 2%, with no significant change in the drugs removal performance. Second, a fixed-bed reactor packed with 2Fe4A was placed after the exit of the biological reactor, with hydraulic retention time of 12 min. 98 and 82% of diclofenac and ranitidine, respectively, were removed, as well as 93% of the added hydrogen peroxide. The coupled system was stable for, at least, 10 days. The operating cost of the heterogeneous Fenton process combined to the biological one was estimated and, although diclofenac and ranitidine could be significantly removed in a short period of time, it was concluded that it is a relatively expensive process that has the disadvantages of high hydrogen peroxide consumption and size exclusion effects. (AU)

• Processo FAPESP: 12/09569-3 - Acoplamento entre processos biológicos e oxidativos avançados para o tratamento de esgoto sanitário: degradação de fármacos e reúso seguro
• Beneficiário: Thiago Henrique Gomes da Silva
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 14/04550-8 - Síntese de catalisadores para degradação de fármacos por processo Fenton heterogêneo
• Beneficiário: Thiago Henrique Gomes da Silva
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 09/53850-6 - EMU: aquisição de espectrômetro de massa para aprofundamento nos estudos de rotas de degradação de compostos orgânicos em reatores aplicados ao tratamento de águas residuárias e a produção de compostos bioativos comerciais
• Beneficiário: Marcelo Zaiat
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários