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Fate of organic micropollutants in a large-scale horizontal flow constructed wetland: AZHUREV

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Abstract

The AZHUREV constructed wetland (CW) is a large-scale pilot (6 ha) CW built at the outlet of the Grand Reims wastewater treatment plant (WWTP) (250,000 equiv. inh.). This CW is composed of three basins (2 ha/basin), supplied in parallel by treated wastewater, each with different types and amount of initial planted vegetation (Phragmite australis, Scirpus lacustris and Glyceria maxima). P. australis is the only planted species still present in the basins; the others were eliminated (coypu diet). Despite this, the three basins are vegetated due to the natural development of opportunistic species (Ceratophyllum sp. and Lemna minor). The main objective of this CW is to further improve the quality of part of the treated water (250 m 3 /h) from WWTP Grand Reims and to treat urban runoff. The second objective is to create a reservoir for biodiversity. Since August 2019, sampling campaigns are conducted with the aim of collecting water, at the inlet and outlet of the CW, and sediments/plants, in the basins, to study the fate of organic micropollutants (OµMs) (80 pharmaceuticals, PFOS and AMPA). Up to now, only analyzes of OµMs in water have been performed. The extractions and analyzes of OµMs in plants and sediments are planned at the beginning of 2021. Among the 80 pharmaceuticals, only 13 (ketoprofen, diclofenac, atenolol, metoprolol, propranolol, sotalol, tramadol, oxazepam, carbamazepin, gabapentin, irbesartan, sulfamethoxazole, metformin) are detected at the inlet and outlet. The OMs are removed to a different degree according to the seasons and by different processes in this CW : (i) ketoprofen, diclofenac, atenolol, metoprolol and propranolol are easily removed (>60%) throughout the year potentially due to photodegradation or sediment adsorption; (ii) tramadol, sotalol, oxazepam, carbamazepin, gabapentin, irbesartan, sulfamethoxazole and metformin are removed (20-35%) mainly during the summer due hypothetically to biodegradation or plant uptake; and (iii) AMPA and PFOS are barely removed (<15 %). There are no significant differences between the three basins for the removal of these compounds.
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Dates and versions

hal-03398877 , version 1 (03-11-2021)

Identifiers

  • HAL Id : hal-03398877 , version 1

Cite

N Maurice, Marie-Noëlle N Pons, N Adouani, C Pochet. Fate of organic micropollutants in a large-scale horizontal flow constructed wetland: AZHUREV. SETAC, May 2021, Virtuel, France. ⟨hal-03398877⟩
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