TREATMENT AND VALORISATION OF STORMWATER SEDIMENTS

The objective of this research is to show how sediment micro-pollution, including heavy metals, hydrocarbons and PAHs, can be reduced by means of a physical treatment based on screening and attrition. The study was carried out on five stormwater sediments, the developed pilot unit allows to isolate pollutants in the fine particles, hence a possible reuse of the coarse, unpolluted fractions. Geotechnical tests carried out on the treated sediments show that most of these fractions are likely to be reused as road embankments, capping layers or pipe embankments. The remediation of stormwater sediments is indeed possible and the development of a mobile unit is actually under study. As sediment treatment is a wide problem, largely exceeding stormwater, ATTRISED process could be used for the remediation of other sediments such as river dredging sediments or sediments from sewer networks.