In addition to the frequently applied biological or physical “in situ” methods, classic soil washing is the only technical and economical alternative in many cases. In this method, contaminated soil from former refineries, coking plants or gasworks is removed for treatment, similar to smaller volumes of soil on which accidents or technical mishaps have occurred, which also resulted in penetration of hydrocarbons containing petroleum, chlorinated hydrocarbons or other contaminants into the soil.
Surfactants for soil washing
First, the sand and gravel particles must be free of adherent contaminants in an aqueous phase. For this purpose, we offer a number of specially formulated surfactants to provide the best degree of cleaning efficiency depending on the type of contamination involved.
Coagulation for soil cleaning
After washing, the contaminants are highly concentrated in the ultrafine particle fraction. Since a closed water system is normally used, this ultrafine fraction must be removed from the aqueous phase completely. The lamella clarifiers used for this purpose can be run with much higher throughput volumes when coagulants are dosed into the medium beforehand.
Polymers for soil decontamination
The outlet section of the lamella clarifier is usually dewatered in the belt press – using polymers or polymer flocculants to obtain a residue that is solid enough to be removed.
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