Influence of two amendments on phyto- and sanitary availability of metals in highly contaminated soils: A greenhouse study

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Janus, Adeline | Pelfrêne, Aurélie | Bidar, Géraldine | Louvel, Brice | Douay, Francis

Edité par HAL CCSD

COM. International audience. Soil is an essential and non-renewable resource which can perform a high number of economic, social and environmental functions as biomass production, source of raw materials or protection of humans and environment (Blum, 2005). However, the soil functionality becomes increasingly compromised due to contaminations caused by human activities. In 2006 and in 39 countries, the European Environmental Agency inventoried approximately 3 million of sites where pollutant activities occurred with more than 1 .8 million potentially contaminated sites (CGDD 2013). In 2012, the most frequently identified contaminants were metals (35 %), hydrocarbons (24 %) and polycyclic aromatic hydrocarbons (11 %). Until recently, the most common remediation technique was the excavation of contaminated soil and its disposal as landfill. However, this kind of method is considered inappropriate because it generates considerable disturbances, is expensive and economically unfeasible on a large scale . Thus, other remediation techniques (ex and in situ) have been developed to overcome these disadvantages . Among them, a technique consists in adding inorganic or organic amendments to the contaminated soils in order to decrease the mobility and bioavailability of pollutants in soils (Kumpiene et al., 2008; Vangronsveld et al., 2009; Bolan et al., 2014; Nejad et al., 2017) . The most often used amendments are phosphate compounds, liming materials, metal oxides and biochars, used alone or in combination (Waterlot et al., 2017; Lahori et al., 2017; Oustrière et al., 2017). The goal of the present work consists in evaluating the ability of two amendments (woody biochar and iron grit, used alone or in combination) to immobilize Cd, Cu, Pb, and Zn in contaminated soils under greenhouse conditions

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