Efficient treatment of swimming pool water by photoelectrocatalytic ozonation: Inactivation of Candida parapsilosis and mineralization of Benzophenone-3 and urea

Autor(es)

Usukura Kim, Joaquim Yuji ^[1] ; Bessegato, Guilherme G. ^{[1, 2]} ; de Souza, Barbara C. ^[1] ; da Silva, Josiel J. ^[1] ; Boldrin Zanoni, Maria Valnice ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista Unesp, Inst Quim, Ave Prof Francisco Degni, 55, BR-14800060 Araraquara, SP - Brazil

^[2] Univ Estadual Oeste Parana UNIOESTE, Ctr Engn & Exact Sci, Rua Fac, 645, BR-85903000 Toledo, PR - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CHEMICAL ENGINEERING JOURNAL; v. 378, DEC 15 2019.
• Citações Web of Science: 0

Resumo

Swimming pool water (SPW) poses a potential risk to both human health and the environment due to the presence of contaminants of emerging concern (including components of sunscreens), pathogenic microorganisms, and eventually products of the reaction of chlorine with urea, such as chloramines, which are found in the water. The present work describes the efficient combination of photoelectrocatalysis and ozonation (PEC + O-3) to treat both simulated and real contaminated pool water. An annular bubble reactor was designed based on a cylindrical TiO2 nanotubes electrode irradiated by an UVB 36 W lamp with an injection of ozone/air. Benzophenone-3 (BP-3) was used as a model of harmful commercial sunscreen to test the reactor efficiency. The results showed that O-3-based treatment efficiently oxidized BP-3 (100% in 20 min) but reached only 32% of mineralization after 120 min of treatment, whereas O-3 + PEC-based treatment reached 82% of TOC removal (with 100% BP-3 removal in 20 min). The addition of 10(6) CFU mL(-1) of Candida parapsilosis did not interfere in BP-3 mineralization, and the fungus was found to be completely inactivated after 45 min of treatment. Furthermore, the presence of urea (10 and 20 mg L-1) was not found to exert any significant influence over BP-3 degradation. The method was successfully applied in real SPW sample fortified with 10.0 mg L-1 of Benzophenone-3. The findings show that O-3 + PEC-based treatment could be a good alternative for SPW treatment, once it leads to efficient disinfection and mineralization of harmful organic compounds. (AU)

• Processo FAPESP: 15/18109-4 - Contribuição dos Materiais Nanoestruturados na Eletroanálise de Fármacos e Corantes, na Oxidação e Redução Fotoeletrocatalítica de Poluentes Orgânicos e Inorgânicos e Desinfecção de Água
• Beneficiário: Maria Valnice Boldrin
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 14/03679-7 - Degradação de corantes de cabelo e efluentes de salão de beleza por fotoeletrocatálise com eletrodos de nanotubos de TiO2 modificados e combinação com ozonização
• Beneficiário: Guilherme Garcia Bessegato
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto