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Related Experiment Videos

A non-biological surrogate for sequential disinfection processes.

Carolina Baeza1, Joel Ducoste

  • 1Department of Civil Engineering, North Carolina State University, 208 Mann Hall CB 7908, Raleigh, NC 27695-7908, USA.

Water Research
|July 28, 2004
PubMed
Summary

Fluorescent microspheres effectively simulate Cryptosporidium parvum inactivation. Sequential ozone and chlorine treatments showed synergistic effects, indicating a promising non-biological method for water disinfection studies.

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Area of Science:

  • Environmental Science
  • Microbiology
  • Chemical Engineering

Background:

  • Cryptosporidium parvum oocysts pose a significant challenge in water treatment due to their resistance to disinfection.
  • Assessing the inactivation efficacy of disinfectants, especially in multi-barrier systems, is crucial for ensuring water safety.

Purpose of the Study:

  • To evaluate the use of Fluorescent YG-microspheres as a surrogate for Cryptosporidium parvum oocysts.
  • To investigate the inactivation of these microspheres using sequential ozone and free chlorine treatments.
  • To understand the synergistic effects of combined disinfectants on microsphere inactivation.

Main Methods:

  • Experiments were conducted in batch reactors with a primary ozone stage followed by a secondary free chlorine stage.

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  • A flow cytometer was utilized to monitor changes in microsphere fluorescence intensity.
  • Microsphere survival ratios were determined by calibrating fluorescence intensity thresholds to mimic C. parvum oocyst inactivation.

    • Main Results:

    • Fluorescent microspheres demonstrated synergistic inactivation when exposed to sequential ozone and chlorine treatments.
    • Ozone exposure damaged the polystyrene surface of the microspheres.
    • This surface damage facilitated enhanced diffusion of chlorine, leading to dye degradation within the microsphere.

    Conclusions:

    • Fluorescent YG-microspheres serve as a viable non-biological surrogate for studying Cryptosporidium parvum inactivation.
    • The observed synergistic inactivation of microspheres mirrors that of C. parvum oocysts under similar disinfection conditions.
    • This method offers a promising approach for evaluating multi-disinfectant water treatment systems.