Study of the performance of disinfection with sodium hypochlorite on a full-scale sewage treatment plant

  • Maria Rosaria Boni Department of Civil, Constructional and Environmental Engineering (DICEA). University of Rome “La Sapienza”, Piazzale Aldo Moro, n° 5, 00185, Roma, Italy.
  • Sabrina Copelli Department of Science and High Technology. University of Insubria, Via Ravasi, n° 2, 21100, Varese, Italy.
  • Massimo Raboni PhD in Civil Engineering. University of Pavia, Corso Str. Nuova, n°65, 27100, Pavia, Italy
DOI: https://doi.org/10.4136/ambi-agua.2652
Keywords: disinfection, Escherichia coli, sewage treatment plants.

Abstract

A full-scale sewage treatment plant was investigated to assess the performance of the disinfection stage. Sodium hypochlorite was used as a disinfectant agent and the process efficiency was evaluated by E.coli removal. The research took place over a period of two years in order to evaluate the effect of retention time (t) and residual chlorine (Cr) under different seasonal conditions. The effectiveness of E.coli removal with sodium hypochlorite proved to be strictly dependent on the factor CR  t (product of residual chlorine with the contact time). The regression line of the experimental points was, on the whole, well comparable with the model proposed by Collins, especially in the field of CRt lower than 30 mg L-1 min.


Published
04/11/2020
Issue
Vol. 15 No. 6 (2020)
Section
Papers

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