Micropolluants dans les eaux usées : qu’apporte un traitement avancé par adsorption sur charbon actif après un traitement conventionnel ?

Abstract : Several advanced treatments such as activated carbon adsorption or ozonation are considered for micropollutants (MPs) removal in wastewater treatment plants (WWTPs). However, little information exists on the overall performances of a WWTP upgraded with those processes and the benefits provided regarding the elimination of multiple families of MPs. In this study, five sampling campaigns were conducted to determine the removal of 48 MPs (mainly pesticides and pharmaceutical residues) in a WWTP followed by a large-scale micro-grain activated carbon pilot with a treatment rate of 10 g/m3. The primary treatment had no effect on MPs (removal < 20%), while the biological treatment eliminated molecules that were sorbed onto sludges or biodegraded (> 60%). Without advanced treatment, the studied WWTP does not allow compliance with Swiss legislation on micropollutants, with reductions significantly lower than the 80% requested (< 50%) for 5 indicator substances If the additional elimination provided by the advanced treatment was not significant (< 10%) for MPs already well removed in the WWTP, activated carbon adsorption significantly reduces their concentration (e.g. decrease by a factor 100 for ibuprofen) and thus limits the impact of the WWTP on the receiving body. The additional elimination provided by the advanced treatment was significant (30-60%) for compounds recalcitrant to conventional treatments and overall removals higher than 60% were obtained for most MPs. A higher dose of activated carbon would be required to achieve higher removal, notably for MPs used in Switzerland as indicator substances. This study also provided the first data on the behavior of several molecules (acetamiprid, estrone, glyphosate, imidacloprid, lorazepam and ofloxacin) along a WWTP with an advanced treatment.
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https://hal.archives-ouvertes.fr/hal-02267952
Contributor : Ronan Guillossou <>
Submitted on : Tuesday, August 20, 2019 - 9:52:52 AM
Last modification on : Friday, October 4, 2019 - 1:21:18 AM

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Ronan Guillossou, Julien Le Roux, Romain Mailler, Emmanuelle Vulliet, Catherine Morlay, et al.. Micropolluants dans les eaux usées : qu’apporte un traitement avancé par adsorption sur charbon actif après un traitement conventionnel ?. Techniques Sciences Méthodes , ASTEE/EDP Sciences, 2019, ⟨10.1051/tsm/201907067⟩. ⟨hal-02267952⟩

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