A tar-contaminated area at a steel plant in the subarctic region of Swedenwas remediated by using the “Freeze Dredging” method. During the operation, approximately2500 tons of tar-contaminated material was removed. The unique features of thefreeze/thaw cycle combined with the thermal process within the coking process openedthe possibility for reuse of the tar component. The innovative method “Freeze Dredging”is an environmental dredging technique performed by freezing the sediment and lifting itup while frozen. Thermal treatment of tar-contaminated material extracts the tar componentfrom the sediment and enables it to be reused. This case study shows that the use ofthermal methods during remedial work makes it possible to develop new treatment methodsand, in addition, new reuse options can also be found.
展开▼
