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Related Experiment Videos

Secondary effluent disinfection: PAA long term efficiency.

M Antonelli1, S Rossi, V Mezzanotte

  • 1DIIAR-Environmental Section, Politecnico di Milano, P.zza L. da Vinci 32, 20133 Milano, Italy. manuela.antonelli@polimi.it

Environmental Science & Technology
|August 18, 2006
PubMed
Summary

Peracetic acid (PAA) effectively disinfects by damaging bacteria, preventing regrowth even after the disinfectant disappears. This study confirms PAA

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Area of Science:

  • Environmental microbiology
  • Water treatment technologies
  • Antimicrobial efficacy studies

Background:

  • Peracetic acid (PAA) is a potent disinfectant.
  • Understanding long-term disinfection efficacy and bacterial regrowth is crucial for water safety.
  • Assessing disinfection byproducts and residual effects is important.

Purpose of the Study:

  • To evaluate the long-term disinfection efficiency of peracetic acid (PAA).
  • To investigate bacterial regrowth potential after PAA treatment under simulated real-world conditions.
  • To compare bacterial enumeration methods for assessing regrowth.

Main Methods:

  • Bench-scale disinfection study using peracetic acid (PAA).
  • Enumeration of fecal coliforms, Escherichia coli, and total heterotrophic bacteria (THB) at 5, 24, and 29-hour intervals post-disinfection.

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  • Comparison of traditional plate count technique and cytometry for THB enumeration.

    • Main Results:

    • Residual PAA concentration became negligible within 5 to 11 hours.
    • No significant regrowth of coliform bacteria was observed after 29 hours.
    • Discrepancies in THB regrowth results between plate counts and cytometry were noted, particularly at lower PAA doses.
    • No regrowth occurred even without residual PAA, indicating irreversible bacterial damage.

    Conclusions:

    • Peracetic acid (PAA) demonstrates potent bactericidal and bacteriostatic properties.
    • PAA treatment leads to long-term disinfection efficacy with no significant bacterial regrowth.
    • Bacteria are unable to repair PAA-induced damage, even at low concentrations.