Bioaugmentation of treatment wetlands – A review

K. Tondera (1) , Florent Chazarenc (1) , Pierre-Luc Chagnon (2) , Jacques Brisson (2)

1 UR REVERSAAL - Réduire, valoriser, réutiliser les ressources des eaux résiduaires
2 UdeM - Université de Montréal

Bioaugmentation in the form of artificial mycorrhization of plant roots and bacterial inoculation has been successfully implemented in several fields including soil remediation or activated sludge treatment. Likewise, bioaugmentation seems a promising approach to improve the functioning of treatment wetlands, considering that natural mycorrhization has been detected in treatment wetlands and that bacteria are the main driver of contaminant degradation processes. However, to date, full scale implementation seems to be rare. This review synthesizes the effects of bioaugmentation on different types of treatment wetlands, to a large extent performed on a microcosm (<0.5 m(2)) or mesocosm scale (0.51 to 5 m(2)). While inoculation with arbuscular mycorrhizal fungi tended to show a positive effect on the growth of some wetland plants (e.g. Phragmites australis), the mechanisms underlying such positive effects are not well understood and the effects of upscaling to full scale treatment wetlands remain unknown. Bacterial inoculation tended to promote plant growth and pollutant degradation, but longer term data is required. (C) 2021 Elsevier B.V. All rights reserved.

Mots clés: Bacterial inoculation; Arbuscular mycorrhize; Constructed wetland; Wastewater treatment; Phytoremediation

Domaines: Sciences de l'environnement

K. Tondera, Florent Chazarenc, Pierre-Luc Chagnon, Jacques Brisson. Bioaugmentation of treatment wetlands – A review. Science of the Total Environment, 2021, 775, pp.145820. ⟨10.1016/j.scitotenv.2021.145820⟩. ⟨hal-03149985⟩