How to give new value to moderately contaminated soil : assessment of wood energy production with short rotation coppice - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement
Conference Poster Year : 2022

How to give new value to moderately contaminated soil : assessment of wood energy production with short rotation coppice

Abstract

Many contaminated sites from former industrial activities have negative asset values reflecting the future remediation and maintenance costs. For a local market opportunity for energy crop production, growing adequate biomass on these sites can provide a positive system with new ecosystem services and substantial economic outcome. These new ecosystems must meet the challenge of producing healthy biomass with high energetic value and quality. In that context, we developed an innovative chain from maximizing the reuse of local soil resources to growing a short rotation coppice harvested after 3 years for specific characterization in laboratory to assess its potential value for energy production purpose (combustion). The experiment takes place in a former industrial brownfield in Colombelles, in France, presenting a moderately contaminated soil of organic and inorganic pollutants. The amount of biomass produced depends on the fertility of the soil and the satisfaction of water requirements, properties that can be restored using adapted soil construction processes. The quality of the biomass, defined as a priority by the absence of inorganic pollutants (metals) can be controlled by the choice of plant species and cultivars and the control of the bioavailability of trace elements in the soil. It is by relying on these two levers, the soil and the plant, that it is possible to develop large-scale biomass production on polluted soils. Firstly, the results will present data on the stocks of excavated soil in terms of pollution and agro-pedological properties and the implementation of a 1800 m2 constructed Technosol pilot plot. Soil construction strategy and plant choice aimed at both controlling metallic trace element and organic pollutants (polycyclic aromatic hydrocarbons and total hydrocarbons) transfers, and restoring land fertility with regard to the needs of the selected coppice. Secondly, the results will assess pollutants transfer into interstitial water and in plant biomass based on the in situ constructed Technosol data completed with phytotrons, and lysimeters controlled experiment using the same growth soil substrate. In situ plant growth performance during a two years cycle will be evaluated as well. Finally, we will present the characterization and testing of the technical feasibility of energy recovery by lab-combustion tests of collected biomass. This part consists in assessing quality of the biomass (pollutant transfer), the pollutant content and the energetic performance. We will demonstrate the feasibility of this approach and discuss its generalization to a large number of situations.
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Dates and versions

hal-04233787 , version 1 (09-10-2023)

Identifiers

  • HAL Id : hal-04233787 , version 1

Cite

Virginie Moreaux, Guillaume Hostyn, Jean-Marie Côme, Emma Lopez, Vincent Huber, et al.. How to give new value to moderately contaminated soil : assessment of wood energy production with short rotation coppice. 11th Conference on Soils of Urban, Industrial, Traffic and Mining Areas, Sep 2022, Berlin (online), Germany. ⟨hal-04233787⟩
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