title: Ex-situ evaluation of bauxite residues as amendment for trace elements stabilization in dredged sediment from Mediterranean Sea: A case study.
abstract: Stabilization of marine dredged sediments contaminated with multi-elements is a challenging task in choosing the appropriate sorbent and application dosage. The present study investigates the possibility of using bauxite residues (Bauxaline® and Bauxsol) as amendment for the treatment of contaminated sediment. A pilot scale experiment was conducted for three months to stabilize trace elements in composted contaminated sediment sample using 5% by-product amendment. The results showed that after 3months of treatment, cationic trace elements were effectively immobilized but increased leaching of anionic pollutants was observed. Increased leaching of anionic pollutants could be limited by addition of higher quantities of amendments. The total content of available pollutants decreased in stabilized sediments but this treatment has no effect on the classification of waste. The leachates were then evaluated for acute toxicity using estuarine rotifers Brachionus plicatilis. Bauxite residues can be inexpensive choices for the stabilization of cationic pollutants in dredged sediments.
authors.affiliation: University of Nice Sophia-Antipolis, Laboratoire des Ecosystèmes Marins Côtiers et Réponses aux Stress (ECOMERS/EA 4228), Faculty of Sciences, Parc Valrose, 06108 Nice Cedex 02, France. Electronic address: mehtaneez@gmail.com.
authors.forename: Mehwish
authors.initials: M
authors.lastname: Taneez
authors.affiliation: University of Nice Sophia-Antipolis, Laboratoire des Ecosystèmes Marins Côtiers et Réponses aux Stress (ECOMERS/EA 4228), Faculty of Sciences, Parc Valrose, 06108 Nice Cedex 02, France.
authors.forename: Charlotte
authors.initials: C
authors.lastname: Hurel
authors.affiliation: University of Nice Sophia-Antipolis, Laboratoire des Ecosystèmes Marins Côtiers et Réponses aux Stress (ECOMERS/EA 4228), Faculty of Sciences, Parc Valrose, 06108 Nice Cedex 02, France.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Marmier
mesh_terms: D000537:Aluminum Oxide; D000818:Animals; D000838:Anions / Q000737:chemistry; D002412:Cations / Q000737:chemistry; D054750:Ecotoxicology / Q000379:methods; D019015:Geologic Sediments / Q000737:chemistry*; D008522:Mediterranean Sea; D010865:Pilot Projects; D012403:Rotifera / Q000187:drug effects; D012987:Soil; D023382:Toxicity Tests, Acute / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D000838:Anions; D002412:Cations; D012987:Soil; D014874:Water Pollutants, Chemical; D000537:Aluminum Oxide
keywords: Bauxite residues; Dredged marine sediments; Low cost mineral additives; Toxicity; Trace elements