183 research outputs found
Comparison of UV, Peracetic Acid and Sodium Hypochlorite Treatment in the Disinfection of Urban Wastewater
One source of water contamination is the release of wastewater that has not undergone
efficient treatment. The aim of this study was to evaluate the reduction obtained with sodium
hypochlorite (NaClO), UV and peracetic acid disinfection treatment of Salmonella spp., pathogenic
Campylobacter, STEC and bacterial indicators in three full-scale municipal wastewater plants. A
general reduction in Salmonella was observed after disinfection, but these bacteria were detected
in one UV-treated sample (culture method) and in 33%, 50% and 17% of samples collected after
NaClO, UV and PAA disinfection treatments, respectively (PCR method). A better reduction was
also observed under NaClO disinfection for the microbial indicators. Independent of the disinfection
treatment, E. coli O157:H7 was not detected in the disinfected samples, whereas some samples treated
with UV and PAA showed the presence of the stx1 gene. No reduction in the presence of stx2 genes
was verified for any of the disinfection treatments. Campylobacter was not detected in any of the
analysed samples. The overall results highlight a better reduction in microbiological parameters with
a NaClO disinfection treatment in a full-scale municipal wastewater plant compared with UV and
PAA. However, the results indicate that a complete and specific monitoring program is necessary to
prevent a possible risk to public health
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