Many undesirable chemical substances are found in the water discharged by wastewater treatment plants. Some of these are not biodegradable (glyphosate, diuron, etc.) while others are adequately eliminated yet still remain in very small concentrations, with proven toxic consequences. In order to improve the quality of discharged water, Irstea and Suez have evaluated the effectiveness of ozone treatment, a complementary treatment technology. Widely used in Switzerland and Germany, the process uses the oxidizing potential of ozone to eliminate recalcitrant micropollutants.
Uniquely, scientists carried out an on-site evaluation over 3 years at the Sophia Antipolis plant (population equivalent of 30,000), the only wastewater treatment plant in France equipped with an ozone treatment facility to treat priority substances.
In total, 12 sampling campaigns were carried out using different ozone doses and 76 micropollutants resistant to the biological wastewater treatment were analyzed Scientists also identified the best doses of ozone to use to treat micropollutants according to their capacity for oxidation. Additionally, the environmental and energy impact of ozone treatment was studied to support communities in choosing appropriate strategies.
Discover the results of the Micropolis-Procédés  project and come and ask the study leaders questions during a dedicated workshop at the Carrefour des Gestions Locales de l’Eau (Local Water Management Conference) on Thursday, January 25, from 11:30am to 1pm in Rennes. Over 70 talks will punctuate this large gathering of water professionals, which brings together 450 exhibitors and over 10,000 participants every year.
You can register for free here with the invitation code CGLE2018 (registration fees do not include lunch).
Consult the program for the 19th Carrefour de l'Eau on January 24 and 25, 2018.
For more information
- News. Reducing micropollutants: ozone treatment proves effective in wastewater treatment plants
- News. Micropollutants: new detection and elimination strategies, made in Irstea
- Feature. Processing and recovering waste water
- Consult the web pages of the Aquatic Environments, Ecology and Pollution (MAEP) unit and the Irstea Lyon-Villeurbanne Center
 23 metals and 53 organic substances (15 hormones, 7 pesticides, 26 pharmaceutical products and 5 metabolites)
 Project funded by the Rhone-Mediterranean and Corsica Water Agency