Degradation of micropollutants; Waste water treatment plants; advanced oxidation processes; adsorption on activated carbon
Abstract :
[en] Pharmaceuticals, personal care products, pesticides and other chemicals used for domestic purpose or for industrial production are continuously discharged into wastewater and lead to global contamination of the aquatic environment all over Europe. Removal during conventional wastewater treatment is unsatisfactory knowing that 20 to 50% of micropollutants are removed in current waste water treatment plants (WWTPs). Analytical methods become more and more sensitive so that traces of organic compounds are nowadays detected in waste, surface and ground waters. The Water Framework Directive listed 45 priority substances to be controlled. Two hormones and one painkiller have been added in 2013 in this directive as well as three antibiotics macrolides, one pesticide, one anti-UV and one anti-oxidant in 2015.
The objective of the AOPTi project is to develop and validate an innovative technology to ensure efficient elimination of different types of micropollutants and toxic effects in waste water. Relevance and behaviour of transformation products in the treated water will be investigated as second issue. The process will be a tertiary treatment process, which can be easily integrated into municipal and industrial WWTPs. It is an economical physico-chemical treatment step after the conventional biological treatment. The process is based on oxidation by ozone and an additional photocatalytic subsequent treatment, followed by an adsorption step. The technology is developed for companies involved in the water purification sector and for companies with toxic effluents loaded with micropollutants.
Innovation: The AOPTi project aims to validate the elimination of the non-biodegradable micropollutants by advanced oxidative procedures (ozonation and photocatalysis) combined with a biological active adsorption step as final finishing process in lab and demonstration scales. Process parameters have to be determined depending on the type of waste water in order to lead to almost total degradation of all micropollutants and to ensure absence of toxicity of the resulting water. Treated water will be characterized in term of chemical transformation products (TPs) and toxicity.
