Sediment and sludge dewatering and treatment: real examples and case studies

Abstract

Remediation of contaminated sediments is becoming more and more common in Sweden, and often the remediated sediments are accompanied by large amounts of water when remediation is done by suction dredging or excavation dredging. RGS 90 have developed techniques to dewater the remediated sediments to minimize the cost of treatment as well as the environmental impact (e.g. less transports are needed if the sediments are being dewatered on site). In the stream Viskan outside Borås in western Sweden, RGS 90 performed a suction dredging where the sediments were dewatered and stabilized. Also, in a pond near Kristinehamn in mid-Sweden, RGS 90 performed an excavation dredging where the sediments were dewatered on a tilting plane.