Laboratory scale study of an industrial phosphate and thermal treatment for polluted dredged sediments |
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| Authors: | Souhila KRIBI Jocelyn RAMAROSON Ange NZIHOU Patrick SHARROCK Guy DEPELSENAIRE |
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| Institution: | Souhila KRIBI,Jocelyn RAMAROSON,Ange NZIHOU, Patrick SHARROCK,and Guy DEPELSENAIRE 1 Ph.D.,Ecole des Mines d’Albi-Carmaux,RAPSODEE UMR-CNRS 2392,Route de Teillet-81013 ALBI CT Cedex 09,France 2 Paul Sabatier University,LERISM,31062 Toulouse,France, 3 Solvay,DCRT,Rue de Ransbeek 310,Brussels,Belgium |
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| Abstract: | Dredged sediments are being chemically treated with phosphoric acid on an industrial scale. 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–900°C). The influence of acid concentration and calcination temperature on the specific surface area of the sediment was investigated. The stabilization of the heavy metals was evaluated by leaching tests and sequential extraction procedures. The phosphoric acid treatment is effective in reducing heavy metal mobility, a prerequisite for recycling the sediments in various construction materials. |
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