Metal immobilization and soil amendment efficiency at a contaminated sediment landfill site: a field study focusing on plants, springtails, and bacteria.
Metal immobilization may contribute to the environmental management strategy of dredged sediment landfill sites contaminated by metals. In a field experiment, amendment effects and efficiency were investigated, focusing on plants, springtails and bacteria colonisation, metal extractability and sediment ecotoxicity. Conversely to hydroxylapatite (HA, 3% DW), the addition of Thomas Basic Slag (TBS, 5% DW) to a 5-yr deposited sediment contaminated with Zn, Cd, Cu, Pb and As resulted in a decrease in the 0.01 M Ca(NO(3))(2)-extractable concentrations of Cd and Zn. Shoot Cd and Zn concentration in Calamagrostis epigejos, the dominant plant species, also decreased in the presence of TBS. The addition of TBS and HA reduced sediment ecotoxicity and improved the growth of the total bacterial population. Hydroxylapatite improved plant species richness and diversity and decreased antioxidant enzymes in C. Epigejos and Urtica dïoica. Collembolan communities did not differ in abundance and diversity between the different treatments.
INERIS, RISK, DRC, Technologies et Procédés Propres et Durables, Parc Technologique Alata, BP2, F-60550 Verneuil en Halatte, France. valerie.bert@ineris.fr
Valérie
V
Bert
Christine
C
Lors
Jean-François
JF
Ponge
Lucie
L
Caron
Asmaa
A
Biaz
Marc
M
Dazy
Jean-François
JF
Masfaraud
D000818:Animals; D001181:Arthropods / Q000378:metabolism*; D001419:Bacteria / Q000302:isolation & purification / Q000378:metabolism*; D044822:Biodiversity; D017753:Ecosystem; D019015:Geologic Sediments / Q000032:analysis*; D008670:Metals / Q000032:analysis / Q000378:metabolism*; D006109:Poaceae / Q000737:chemistry / Q000254:growth & development / Q000378:metabolism*; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000032:analysis / Q000378:metabolism*
D008670:Metals; D012989:Soil Pollutants