Catalyst-free persulfate activation by UV/visible radiation for secondary urban wastewater disinfection

• Tipo: Artigo em Revista Científica Internacional
• Data: 2023

Autores

Calaixo, MRC (Autor) Outra; Ribeirinho-Soares, S (Autor) Outra; Luis Madeira (Autor) FEUP; Olga C Nunes (Autor) FEUP; Rodrigues, CSD (Autor) Outra

Revista

Título: Journal of Environmental Management

Vol. 348

ISSN: 0301-4797

Editora: Elsevier

Indexação

ISI Web of Knowledge - 0 Citações

Scopus - 0 Citações

Outras Informações

ID Authenticus: P-00Z-AB6

DOI: 10.1016/j.jenvman.2023.119486

Abstract (EN): This study focuses on the treatment of secondary urban wastewater (W) to improve the effluent quality aiming at the reduction of pathogenic microorganisms for the safe reuse of the treated wastewater (TW). Catalyst-free persulfate activation by radiation-based oxidation was applied as a treatment technology. A parametric study was carried out to select the best operating conditions. Total enterobacteria inactivation (quantified by the log reduction (CFU/100 mL)) was achieved when using [S2O82-] =1 mM, pH = 8.5 (natural pH of W), T = 25 degrees C, and I = 500 W/m(2). However, storing TW for 3 days promoted the regrowth of bacteria, risking its reutilization. Therefore, in this study, and for the first time, the potential beneficial role of inoculation of wastewater treated by the radiation-activated persulfate process with a diverse bacterial community was evaluated in order to control the regrowth of potentially harmful microorganisms through bacterial competition. For this, TW was diluted with river water (R) in the volume percentages of 5, 25, and 50 (percentages refer to R content), and enterobacteria and total heterotrophs were enumerated before and after storage for 72 h. The results showed total heterotrophs and enterobacteria regrowth for TW and R + TW diluted 5 and 25% after storage. However, for R + TW diluted 50%, only the total heterotrophs regrew. Hence, the treated wastewater generated by the oxidative process diluted with 50% river water complies with the legislated limits for reuse in urban uses or irrigation.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 12