Laboratory and field investigation of chemical disinfection of combined sewer overflow in Copenhagen area

Ravi Kumar Chhetri, Dines Thornberg, Jesper Berner, Robin Gramstad, Ulrik Öjstedt, Kasper Juel-berg, Annette Kolte-Olsen, Jean De Dieu Otoa, Anitha Kumari Sharma, Henrik Rasmus Andersen

Research output: Contribution to conferencePaperResearchpeer-review

Abstract

We investigated the possibility to apply performic acid (PFA) and peracetic acid (PAA) for disinfection of combined sewer overflow (CSO) in existing CSO management infrastructures. The disinfection power of PFA and PAA to Escherichia coli (E. coli) and enterococcus were studied in batch scale and pre-field experiment. In batch scale experiment 2.5 mg·L -1 PAA removed around 4 log unit of E. coli and enterococcus from CSO with long contact time. Removal of E. coli and enterococcus from CSO were always around or above 3 log unit using 2-4 mg·L -1 PFA with short contact time in batch scale and pre-field experiment. There were no toxicological effect measured by Vibrio fischeri when CSO was disinfected with PFA, slight toxicological effect was observed on CSO disinfected with PAA. When the design for PFA based disinfection was applied to CSO collected from an authentic event. Disinfection efficiencies were confirmed and degradation rates were slightly higher than predicted in simulated CSO.
Original languageEnglish
Publication date2013
Number of pages9
Publication statusPublished - 2013
Event13th Nordic Wastewater Conference - Malmö, Sweden
Duration: 8 Oct 201310 Oct 2013
Conference number: 13

Conference

Conference13th Nordic Wastewater Conference
Number13
CountrySweden
CityMalmö
Period08/10/201310/10/2013

Keywords

  • Disinfection
  • Combined sewer overflow
  • Peracetic acid
  • performic acid

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