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Effect of phosphatation and calcination on the environmental behaviour of sediments

International Journal of Sediment Research 2019年第5期34卷 486-495页

作者： Moussa Dia Rachid Zentar Nor-edine Abriak Ange Nzihou Guy Depelsenaire Alain Germeau Department of Civil & environmental Engineering Toulouse University Mines Albi CNRS RAPSODEE Center Campus Jarlard SOLVAY SA DCRT 4. PRAYON SA

Dredging operations produce considerable quantities of materials, to be managed and this opens an opportunity for valorization in civil engineering. However, the contamination of the dredged sediment has become a major problem to solve. The major contaminants are heavy metals and organic compounds This study focuses on the use of phosphoric acid(H3 PO4) to stabilize heavy metals from sediments an destroy organic matter by calcination at 650 °C with a goal of using sediments in roadworks. Severa studies have been conducted in this field. The stabilized materials obtained have been used in civ engineering. The main purpose of this work is to discuss the environmental behavior of marine sedimen treated by phosphatation and calcination. Two types of phosphoric acids were used. The p H dependenc leaching test has been used as the basic characterization to evaluate the effect of the type of phosphori acid on the metals behavior in a valorization scenario. The standard leaching test and the Toxicit Characteristic Leaching Procedure(TCLP) were conducted as compliance tests. In regards of the obtaine results, the environmental assessment has also shown a reduction in the availability of targeted heav metals in alkaline environment whatever the type of acid used for treatment. This opens opportunitie for co-valorization.

关键词： Polluted sediments Heavy metals Phosphatation calcination and environmental behaviour

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