Abstract: A process is described for dewatering a water-containing material by mixing sphagnum plants into the material as a structural element, and that the mixture thereafter is subjected to a drying process. By mixing sphagnum plant into to such water-containing materials, and thereafter by dewatering the material, traditional processing methods such as composting and incineration of such materials will be much improved.

Abstract: There is described a process for cleansing contaminants, such as oil, PCB, PAH, heavy metals and the like, from a heterogeneous material, such as sand, gravel, earth, oil gravel, asphalt, drill borings ("kaks") and the like. More specifically the invention relates to a process comprising the steps: i) that a sorption agent is added to the material, and that the material and the sorption agent are mixed/kneade sufficiently for a considerable portion of the contamination to be extracted from the material and absorbed by the sorption agent, and that ii) thereafter the sorption agent is separated from the material on the basis of specific gravity/particle size by means of an applied flow of gas, so that the sorption agent is led with the flow and can be collected in a separate fraction.