Synthetic and natural waters disinfection using natural solar radiation in a pilot plant with CPCs

• Tipo: Artigo em Revista Científica Internacional
• Data: 2009

Autores

Gomes, AI (Autor) Outra; Vitor Vilar (Autor) FEUP; Rui Boaventura (Autor) FEUP

Revista

Título: Catalysis Today

Vol. 144

Páginas: 55-61

ISSN: 0920-5861

Editora: Elsevier

Indexação

ISI Web of Knowledge - 15 Citações

ISI Web of Science

Scopus - 18 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Outras ciências da engenharia e tecnologias

CORDIS: Ciências Tecnológicas

Outras Informações

ID Authenticus: P-003-J6T

DOI: 10.1016/j.cattod.2008.12.023

Abstract (EN): Solar disinfection of synthetic and natural waters from the Douro River, northern Portugal was studied in a pilot plant with compound parabolic collectors. Inactivation of Enterococcus faecalis was slower than Escherichia coli possibly due to the cell wall composition of the Gram-positive and Gram-negative bacteria, respectively. The high content of peptidoglycan, teichoic acids, polysaccharides, and peptidoglycolipids, in E. faecalis cell wall, when compared with E. coli, acts as a protective coating. Higher inactivation rate constants were obtained for higher initial bacteria concentrations; however a greater dose of UV energy was required. The flow rate effect in disinfection of synthetic waters was negligible. However, for natural waters with low bacteria contamination, the effect of the mechanical stress on the inactivation increased with the flow rate. Competition for the reactive oxidant radicals was observed in binary systems, containing similar concentrations of E. coli and E. faecalis. No bacterial regrowth was observed for E. faecalis in synthetic waters. Oppositely, regrowth occurred for natural waters. This behaviour can be due to the natural water chemical composition, with the presence of various organic and inorganic species.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7