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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
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.
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.
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