Toxicity and disinfection assessment of metal containing WWTP effluents during ozonation and UV/H2O2

Autor(es)

Malvestiti, Jacqueline A. ; Simao, Debora C. ; Dantas, Renato F.

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF WATER PROCESS ENGINEERING; v. 46, p. 9-pg., 2022-04-01.

Resumo

Disinfection of effluents by ozonation and UV/H2O2 has growth around the world in the last decades. However, in this type of treatment the composition of the effluent can affect the efficiency due to competition of some components for hydroxyl radicals, thus delaying the inactivation of microorganisms. This work studied the influence of the presence of seven metals during WWTP disinfection by ozonation and UV/H2O2 as well as assessed the toxicity evolution along the reaction time. For this purpose, concentrations 3 times higher than metals allowed in Brazilian legislation were used to verify their effects on effluent disinfection and toxicity after ozonation and UV/H2O2. The microorganisms inactivation, represented by Escherichia coli and total coliforms, were significantly accelerated by the presence of Fe, Cu and all metals added simultaneously to the reactor for both treatments, being the Fe that which presented the highest impact, while the presence of Zn and Ni also accelerated the inactivation during the UV/H2O2 treatment. The other metals showed no statistically significant influences. Regarding the toxicity evaluation, both treatments had a positive influence by reducing acute toxicity of the samples. Cr, Pb, Fe, Cu presence promoted the highest toxicity to the E. sativa and A. salina. Nevertheless, ozonation and UV/H2O2 treatments were able to importantly reduce the acute toxicity in the wastewater samples in presence of these components, proving to be a good option to reduce the acute toxicity caused by industrial contamination in municipal secondary effluents. (AU)

• Processo FAPESP: 16/07911-7 - Desinfecção de efluentes secundários por UV/H2O2
• Beneficiário: Jacqueline Aparecida Malvestiti
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 14/17774-1 - Influência da composição do efluente secundário na desinfecção por processos oxidativos avançados
• Beneficiário: Renato Falcão Dantas
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores