Influence of industrial contamination in municipal secondary effluent disinfection by UV/H2O2

Autor(es)

Malvestiti, Jacqueline A. ^[1] ; Dantas, Renato F. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Campinas UNICAMP, Sch Technol, Paschoal Marmo 1888, BR-13484332 Limeira, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Environmental Science and Pollution Research; v. 26, n. 13, p. 13286-13298, MAY 2019.
• Citações Web of Science: 1

Resumo

Advanced oxidation processes, including UV/H2O2, are methods able to remove diverse classes of organic contaminants and disinfect water and wastewater. However, the variation in the matrix composition can influence the inactivation of microorganisms due to the presence of competing reactive material, which consumes the available oxidants. This problem can lead to the use of inadequate oxidant/radiation dose and disturb a correct treatment. The aim of this study was to assess the efficiency of UV/H2O2 to inactivate microbiological indicators in secondary effluents in the presence of high concentration of carbonate, nitrate, metals, and industrial organic contaminants. Metals had a positive influence on inactivation acting as catalysts. Zn, Fe, and all metals simultaneously presented toxic effects to the indicator organisms in the higher concentrations before the treatment. Even in metals presence, the negative effect of carbonate and the industrial organic contaminants on indicators inactivation was very important. Bacteria regrowth after 72h was also affected by the same inhibiting substances, but the metals acted positively inhibiting it. The disinfection indicators had different sensibilities to the spiked substances. Escherichia coli inactivation was more affected than total coliforms by the presence of the industrial contamination, which can lead to different interpretation of inhibition degree depending of the used disinfection indicator. (AU)

• 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