Stabilisation of Heavy Metals from Dredged Sediment. Tailoring of Residue Properties

Title: Stabilisation of Heavy Metals from Dredged Sediment. Tailoring of Residue Properties
Author(s): Kribi
Paper category : conference
Book title: International RILEM Conference on the Use of Recycled Materials in Building and Structures
Editor(s): E. Vázquez, Ch. F. Hendriks and G.M.T. Janssen
Print-ISBN: 2-912143-52-7
e-ISBN: 2912143756
Publisher: RILEM Publications SARL
Publication year: 2004
Pages: 824 - 832
Total Pages: 9
Nb references: 1
Language: English

Abstract: This study assesses the technology to treat heavy metals from dredged sediments using phosphoric acid (The Novosol process, developed by Solvay ) with the goal of converting metals, mainly Pb, Cd, Zn and Cu to insoluble metallic phosphates. The effectiveness of the treatment was evaluated by performing the chemical reaction in a tubular reactor, followed by convective drying and maturation of the treated sediment at ambient temperature and finally thermal destruction of the organic matter by calcinations (500°C-700°C). Selected variables (acid concentration, volume fraction of solids, flow rate, drying and calcination temperature and time) were investigated. Laboratory scale experiments were carried out with various combinations of these parameters.
The influence of the quantity of acid on drying times, the physical property of the sediment and the stabilization of the heavy metals are discussed.

Online publication: 2004-09-29
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143756.091