Treatment of surface water by O3 or O3/H2O2 AOP: Cost-benefit of micropollutant elimination versus formation of oxidation products and by-products
Event details
| Date | 25.11.2014 |
| Hour | 16:15 › 17:15 |
| Speaker | Dr Marc Bourgin, Environmental Chemistry, EAWAG Duebendorf |
| Location | |
| Category | Conferences - Seminars |
Abstract:
The combination of O3 and H2O2 is a widely appliedAOP, producing highly reactive •OH radicals,to improve water quality at moderate cost compared to other AOPs. In the present study, the oxidation of a broad range of micropollutants (pharmaceuticals, pesticides, X-Ray contrast media, artificial sweeteners and industrial chemicals) by conventional ozonation and the AOP O3/H2O2was investigated in two pilot-plants (conventional system and PRO3MIX, 4 – 5 m3/h) treatingLake Zürich water. The following parameters were studied: ozone dose (0.5 – 3 mg/L), initial bromide concentration (16 – 200 µg/L), pH (6.5 – 8.5) and O3:H2O2 mass ratio (1:0.35 – 1:3). Elimination of chemicals > 90%, even for persistent compounds like sucralose, could be achieved at optimized conditions. The formation of selected transformation products and their further oxidation was also followed up. The production of bromate, apotentially carcinogenic ozonation by-product, could be substantially reduced by a factor ≥5 for optimized H2O2 doses.
Short biography:
Marc Bourgin completed his PhD in 2011 at the National Polytechnic Institute of Toulouse (France) where he investigated the ozonation of pesticides in water and on seeds. From 2011 to 2012, he worked as a postdoc at the National Veterinary School of Nantes (France) and studied the elimination of some endocrine disrupting compounds during oxidative water treatment. Since March 2013, Marc Bourgin has been involved in the EU project DEMEAU as a postdoc at Eawag where he is currently investigating the efficiency of ozonation processes in pilot- and full-scale to remove micropollutants and mitigate the formation of transformation products and oxidation by-products.
The combination of O3 and H2O2 is a widely appliedAOP, producing highly reactive •OH radicals,to improve water quality at moderate cost compared to other AOPs. In the present study, the oxidation of a broad range of micropollutants (pharmaceuticals, pesticides, X-Ray contrast media, artificial sweeteners and industrial chemicals) by conventional ozonation and the AOP O3/H2O2was investigated in two pilot-plants (conventional system and PRO3MIX, 4 – 5 m3/h) treatingLake Zürich water. The following parameters were studied: ozone dose (0.5 – 3 mg/L), initial bromide concentration (16 – 200 µg/L), pH (6.5 – 8.5) and O3:H2O2 mass ratio (1:0.35 – 1:3). Elimination of chemicals > 90%, even for persistent compounds like sucralose, could be achieved at optimized conditions. The formation of selected transformation products and their further oxidation was also followed up. The production of bromate, apotentially carcinogenic ozonation by-product, could be substantially reduced by a factor ≥5 for optimized H2O2 doses.
Short biography:
Marc Bourgin completed his PhD in 2011 at the National Polytechnic Institute of Toulouse (France) where he investigated the ozonation of pesticides in water and on seeds. From 2011 to 2012, he worked as a postdoc at the National Veterinary School of Nantes (France) and studied the elimination of some endocrine disrupting compounds during oxidative water treatment. Since March 2013, Marc Bourgin has been involved in the EU project DEMEAU as a postdoc at Eawag where he is currently investigating the efficiency of ozonation processes in pilot- and full-scale to remove micropollutants and mitigate the formation of transformation products and oxidation by-products.
Practical information
- General public
- Free
- This event is internal
Organizer
- EESS - IIE
Contact
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