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Bioturbation effects on bioaccumulation of cadmium in the wetland plant Typha latifolia: A nature-based experiment

Hoang, Trung Kien and Probst, Anne and Orange, Didier and Gilbert, Franck and Elger, Arnaud and Kallerhoff, Jean and Laurent, François and Bassil, Sabina and Duong, Thi Thuy and Gerino, Magali Bioturbation effects on bioaccumulation of cadmium in the wetland plant Typha latifolia: A nature-based experiment. (2018) Science of the Total Environment, 618. 1284-1297. ISSN 0048-9697

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Official URL: https://doi.org/10.1016/j.scitotenv.2017.09.237

Abstract

The development of efficient bioremediation techniques to reduce aquatic pollutant load in natural sediment is one of the current challenges in ecological engineering. A nature-based solution for metal bioremediation is proposed through a combination of bioturbation and phytoremediation processes in experimental indoor microcosms. The invertebrates Tubifex tubifex (Oligochaeta Tubificidae) was used as an active ecological engineer for bioturbation enhancement. The riparian plant species Typha latifolia was selected for its efficiency in phytoaccumulating pollutants from sediment. Phytoremediation efficiency was estimated by using cadmium as a conservative pollutant known to bioaccumulate in plants, and in itially introduced in the overlying water (20 μg Cd/L of cadmium nitrate – Cd(NO3)2· 4H2O). Biological sedim ent reworking by invertebrates' activity was quantified using luminophores(inert particulates). Our results showed that bioturbation caused by tubificid worms' activity followed the bio-conveying transport model with a downward vertical velocity (V) of luminophores ranging from 16.7 ± 4.5 to 18.5 ± 3.9 cm· year− 1. The biotransport changed the granulometric properties of the surface sediments, and this natural process was still efficient under cadmium contamination. The highest value of Cd enrichment coefficient for plant roots was observed in subsurface sediment layer (below 1 cm to 5 cm depth) with tubificids addition. We demonstrated that biotransport changed the distribution of cadmium across the sediment column as well as it enhanced the pumping of this metal from the surface to the anoxic sediment layers, thereby increasing the bioaccumulation of cadmium in the root system of Typha latifolia. This therefore highlights the potential of bioturbation as a tool to be considered in future as integrated bioremediation strategies of metallic polluted sediment in aquatic ecosystems.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre de Coopération Internationale en Recherche Agronomique - CIRAD (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Ecole Nationale Vétérinaire de Toulouse - ENVT (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
French research institutions > Institut National de la Recherche Agronomique - INRA (FRANCE)
French research institutions > Institut de Recherche pour le Développement - IRD (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Université des Sciences et des Technologies de Hanoi - USTH (VIETNAM)
Other partners > Graduate University of Science and Technology - GUST (VIETNAM)
Other partners > Vietnam Academy of Science and Technology - VAST (VIETNAM)
Laboratory name:
Funders:
Programme de Bourses d'Excellence de l'Ambassade de France au Vietnam - University of Science and Technology of Hanoi (USTH)
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Deposited By: Anne PROBST
Deposited On:30 Oct 2018 09:54

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