REDUCTION OF MICROORGANISMS IN
SEWAGE EFFLUENT USING
HYPOCHLORITE AND PERACETIC ACID
AS DISINFECTANTS
Bonadonna L. 1 , Della Libera S. 1 , Veschetti E. 1 , Cutilli D. 1 , Ottaviani M. 1 , Divizia M. 2 , Donia D. 2 , Gabrieli R. 2 ,
Panŕ A. 2 , Martini C. 3 , Anastasi P. 3
Laboratory of Environmental Hygiene, Institute of Public Health, Rome
2 University of Tor Vergata, Rome
3 ACEA, Rome, Italy |
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Summary:
A comparative study on peracetic acid and sodium hypochlorite in inactivating bacteria and viruses was carried out. Therefore the
disinfection actions of peracetic acid, in comparison with sodium hypochlorite, was evaluated against the usual indicators of faecal
contamination, the pathogen Salmonella, Pseudomonas spp., bacteriophages anti-Escherichia coli, F+/ phage and the phage of Bacterioides
fragilis B40-8 and enteroviruses. Under the experimental conditions, no representative results were obtained for enteroviruses and phages
because of their low concentration in the sewage effluent. On the other hand, the indicator organisms were reduced substantially by the
sodium hypochlorite and peracetic acid concentrations, while more variable results were obtained against Pseudomonas and bacteriophages
anti-Escherichia coli.
Key words:
sewage, disinfection, peracetic acid, faecal pollution
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