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Disinfection performance using a UV/persulfate system: effects derived from different aqueous matrices.

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Area of Science:

  • Environmental Science
  • Water Treatment Technologies
  • Photochemistry

Background:

  • Traditional water disinfection methods face challenges in marine environments.
  • Advanced photochemical processes offer alternatives for microbiological control.
  • Evaluating UV/persulfate (PDS) for marine water disinfection is crucial.

Purpose of the Study:

  • To assess the efficacy of UV/PDS for inactivating Enterococcus faecalis in various water matrices.
  • To optimize UV/PDS parameters including PDS concentration and exposure time.
  • To investigate the impact of natural water constituents on UV/PDS disinfection performance.

Main Methods:

  • Bench-scale experiments were conducted to test UV/PDS efficacy.
  • Persulfate concentrations (1-10 mM) and UV exposure times (0-5 min) were optimized in distilled water.
  • UV/PDS system performance was evaluated in mineral water, saltwater, and marine saltwater, with bacterial consortia (E. coli + E. faecalis).

Main Results:

  • Optimal PDS dosage was determined to be 1 mM.
  • The UV/PDS system demonstrated effectiveness across different water matrices, including marine saltwater.
  • Bacterial inactivation levels were consistent regardless of bacterial groups or structures in consortium tests.

Conclusions:

  • UV/PDS is a viable photochemical process for treating marine waters.
  • This method presents an attractive alternative to existing seawater treatment technologies.
  • Further research into UV/PDS for marine applications is warranted.