[Purification of lake water using a combined ozonization, filtration and chlorine dioxide treatments. Experience with the water of Garda lake]. / Potabilizzazione di acqua lacustre mediante trattamento combinato di ozonizzazione, filtrazione e biossido di cloro. Esperienze sulle acque del lago di garda.
Ann Ig
; 17(6): 553-63, 2005.
Article
em It
| MEDLINE
| ID: mdl-16523714
ABSTRACT
The hygienic characteristics of the freshwater from Garda Lake used for the water supply of Sirmione were evaluated before and during the various phases of treatment. The samples were taken at the moment of entry, after ozonization, after filtration and after the addition of chlorine dioxide. The coliforms and Escherichia coli, occasionally detected in the incoming water, were reduced by ozone and eliminated by filtration. Enterococci were always absent. The overall reduction in the total bacteria count was satifactory, considering the low initial levels (96.0% and 83.0% respectively for the Heterotrophic plate count at 22 degrees and the Heterotrophic plate count at 36 degrees). The chemical and physical indicators that underwent the greatest reductions were the sulphates, iron, manganese, ammonia and the turbidity. Several species of unicellular algae belonging to Chlorophyta, Cyanophyta and Bacillariophyta were identified in the water at entry and after ozonization, but were completely eliminated during the subsequent phase of filtration. deliver of high quality services.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Purificação da Água
Tipo de estudo:
Prognostic_studies
País/Região como assunto:
Europa
Idioma:
It
Revista:
Ann Ig
Assunto da revista:
MICROBIOLOGIA
/
SAUDE PUBLICA
Ano de publicação:
2005
Tipo de documento:
Article