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Micropollutants removal by full-scale UV-C/sulfate radical based Advanced Oxidation Processes.

J Rodríguez-Chueca1, E Laski2, C García-Cañibano3

  • 1Department of Chemical and Environmental Technology (ESCET), Universidad Rey Juan Carlos, C/ Tulipán s/n, 28933 Móstoles, Madrid, Spain; Department of Chemical & Environmental Engineering, Technical University of Madrid, (UPM), C/ José Gutiérrez Abascal 2, 28006 Madrid, Spain.

The Science of the Total Environment
|March 21, 2018
PubMed
Summary

Advanced Oxidation Processes (AOPs) using hydrogen peroxide (H2O2) or peroxymonosulfate (PMS) with UV-C light effectively remove micropollutants (MPs) in wastewater. H2O2/UV-C offers better cost-efficiency than PMS/UV-C for MP treatment.

Keywords:
Full-scaleMicropollutantsSulfate radicalsTertiary treatmentUV-C radiationWWTP

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Area of Science:

  • Environmental Engineering
  • Water Treatment Technologies
  • Chemical Oxidation

Background:

  • Micropollutants (MPs) persist in wastewater due to high chemical stability and low biodegradability.
  • Conventional wastewater treatment struggles to remove a wide range of MPs.
  • Advanced Oxidation Processes (AOPs) show promise for MP removal at lab-scale, but full-scale data is limited.

Purpose of the Study:

  • To evaluate the full-scale application of three AOPs (H2O2/UV-C, PMS/UV-C, PS/UV-C) for micropollutant removal.
  • To compare the efficiency and cost-effectiveness of different AOPs in tertiary wastewater treatment.
  • To determine optimal oxidant dosages and UV-C contact times for MP abatement.

Main Methods:

  • Application of homogeneous oxidants (H2O2, PMS, PS) in conjunction with UV-C tertiary treatment at the Estiviel WWTP.
  • Testing low oxidant dosages (0.05-0.5 mM) and short UV-C contact times (4-18 s).
  • Quantification of the removal efficiency for 25 different MPs.

Main Results:

  • AOPs significantly outperformed UV-C radiation alone in removing 25 MPs.
  • H2O2/UV-C and PMS/UV-C achieved similar average MP removal rates (48-55%) at optimal conditions (0.5 mM, 18 s).
  • H2O2/UV-C demonstrated superior cost-efficiency (€/m³·order) compared to PMS/UV-C and UV-C alone.

Conclusions:

  • AOPs, particularly H2O2/UV-C, are effective and cost-efficient for full-scale micropollutant removal in wastewater.
  • Low oxidant dosages and short UV-C contact times are sufficient for significant MP abatement.
  • The addition of H2O2 can compensate for increased UV-C energy consumption, enhancing overall treatment efficiency.