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Evaluation of the Efficacy of Organic Peroxyacids for Eradicating Dairy Biofilms Using an Approach Combining Static and Dynamic Methods
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Reducing pathogens in combined sewer overflows using performic acid.

Katharina Tondera1, Kassandra Klaer1, Christoph Koch2

  • 1Institute of Environmental Engineering of RWTH Aachen University (ISA), 52056 Aachen, Germany.

International Journal of Hygiene and Environmental Health
|May 5, 2016
PubMed
Summary

Performic acid (PFA) effectively reduces bacteria like E. coli and viruses such as somatic coliphages in combined sewer overflows (CSOs). However, PFA is less effective against protozoan parasites and requires longer reaction times for optimal disinfection in decentralized CSO treatment.

Keywords:
BacteriaCombined sewer overflowsDisinfectionParasitesPerformic acidViruses

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Area of Science:

  • Environmental Science
  • Water Treatment Technologies
  • Microbiology

Background:

  • Combined sewer overflows (CSOs) are significant sources of surface water contamination with pathogens.
  • Traditional disinfectants like chlorine can cause toxic by-products and increase operational costs.
  • Decentralized treatment facilities offer potential for managing CSO impacts.

Purpose of the Study:

  • To evaluate the efficacy of performic acid (PFA) for disinfecting bacteria, viruses, and protozoan parasites in CSOs.
  • To assess the operational feasibility of PFA disinfection units in decentralized CSO treatment settings.

Main Methods:

  • A PFA dosing unit was installed at the inflow of a CSO storage tank.
  • PFA was dosed to achieve concentrations between 12-24 mg/L in the inflowing stormwater.
  • Removal efficiencies for bacteria, viruses, and protozoan parasites were measured.

Main Results:

  • Significant reductions in bacteria were observed, with mean removal efficiencies of 1.8 log10 for Aeromonas spp. and 3.1 log10 for E. coli.
  • Somatic coliphages (viruses) showed a mean reduction of 2.7 log10.
  • PFA demonstrated limited efficacy against protozoan parasites like Giardia lamblia.
  • Operational dosing was found to be uncritical in decentralized facilities.
  • Insufficient reaction time between PFA dosing and dilution with surface water was identified as a limitation.

Conclusions:

  • Performic acid shows promise for reducing bacterial and viral loads in CSOs at decentralized facilities.
  • PFA is not currently suitable for removing protozoan parasites from CSOs.
  • Optimizing reaction time is crucial for effective PFA disinfection in CSO management.