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Use of organic amendment and endomycorrhizal fungi for steel slags phytostabilization

Abstract : Steel slags are major by-products of the steel and iron industry. Particularly rich in metallic trace elements, these materials are massively stored in slagheaps and can constitute potential nuisance for the environment and public health. Several studies [(Alvarenga et al., 2009), (Mench et al., 2010)] have shown the effectiveness of phytostabilization processes for rehabilitating sites contaminated by high levels of metals, both because of their sustainable and ecological aspects but also due to their low implementation costs. Recent studies have indeed demonstrated the benefits of using indigenous AMF (Arbuscular Mycorrhizal Fungi) isolates for the phytostabilization of metal polluted soils (Lacercat-Didier et al., 2016) and alkaline mine tailings [(Orłowska et al., 2010), (Giridhar Babu and Sudhakara Reddy, 2011)]. The slagheap studied in this work contains approximately 500 000 tons of slags spread over an area of about 4 ha. A previous study (Bouchardon et al., 2014) carried out on the same site has demonstrated that the use of “Composted Sewage Sludge” (CSS) as an organic amendment favors the installation of metallophytes herbaceous species naturally able to grow on this type of substrate. In this work, we evaluated the coupled effects of CSS and AMF inoculation on : 1) the soil pore water composition and metals bioavailability and 2) the vegetation in terms of biomass production as well as accumulation of metallic compounds in leaves. Results showed that AMF inoculation led to root colonization and improved K and P uptake. We also observed that the CSS amendment has a critical role on plant growth by decreasing the fluid pH (from 10.5 to 8.5) and thus, the speciation of Al in the system. Indeed, geochemical modelling run with the PhreeqC program (Parkhurst & Appelo, 2013) revealed that Al becomes soluble, and therefore toxic for plant development, at a pH higher than 9.
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https://hal-emse.ccsd.cnrs.fr/emse-02489850
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Submitted on : Monday, February 24, 2020 - 4:45:11 PM
Last modification on : Wednesday, June 24, 2020 - 4:19:35 PM

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  • HAL Id : emse-02489850, version 1

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Mathieu Scattolin, Olivier Faure, Fernando Pereira, Steve Peuble. Use of organic amendment and endomycorrhizal fungi for steel slags phytostabilization. 15th International Conference on Sustainable Use and Management of Soil, Sediment and Water Resources - AquaConsoil 2019, Deltares, May 2019, Antwerp, Belgium. ⟨emse-02489850⟩

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