Transfert heavy metal sewage sludge as fertilizer from soil to ray grass

Najla Lassoued (1) , Mohamed N. Khelil (1) , Saloua Rejeb (2) , Essaïd Bilal (3, 4, 5) , Mohamed Chaouachi (1) , Mohamed Nejib Rejeb (1) , Issam Guénole-Bilal (6)

1 INRGREF - Institut National de Recherche en Génie Rural Eaux et Forêts
2 LRGREAI - Laboratoire de Recherche Gestion des Risques Environnementaux en Agriculture Irrigué
3 SPIN-ENSMSE - Centre Sciences des Processus Industriels et Naturels
4 GSE-ENSMSE - Département GéoSciences et Environnement
5 EVS - Environnement, Ville, Société
6 DP - Département de Physiologie

The land application of sewage sludge reveals a significant increase in dray matter production of Ray Grass (Lolium perenne L.). In equivalent dose of liquid sludge, we registered a lower production of dry material. Besides, neither the dose nor type of sludge seems to have an effect on heavy metals contents in the air part plant. On the other hand, contribution of sludge under dry or liquid forms increases significantly heavy metals contents in roots with regard to witness without sludge. The comparison between the beginning and end of culture, revealed a decrease heavy metals contents in soil in particular at horizon 0-40 cm deep. Besides, this decrease Cd, Zn, Pb and Cu contents in soil is not linking to transfer from soil to air part of plant, but rather is the accumulation in roots, which play the role of a barrier.

Mots clés: heavy metals; transfer; soil; Ray Grass; sewage sludge

Domaines: Génie des procédés; Biotechnologies; Biotechnologie

Najla Lassoued, Mohamed N. Khelil, Saloua Rejeb, Essaïd Bilal, Mohamed Chaouachi, et al.. Transfert heavy metal sewage sludge as fertilizer from soil to ray grass. Banat's Journal of Biotechnology, 2014, 9, pp.86. ⟨10.7904/2068-4738-V(9)-86⟩. ⟨hal-00997273⟩