Soil Washing

chlorinated coal materials, separ chemie, classical ground laundryIn 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 just like smaller volumes of soil on which accidents or technical accidents have occurred, resulting in penetration of hydrocarbons containing petroleum, chlorinated hydrocarbons or other contaminants into the soil.

Two groups of chemicals are used in this field of application:

Work steps for soil washing

First, the sand and gravel particles must be free of adherent

contaminants in an aqueous phase. For this purpose, we carry a number

of specially formulated surfactants to provide the best degree of

cleaning efficiency depending on the type of contamination involved.

Purifying particles, coagulants, separ chemie, polymere, contamination, pollutants

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 lamellar clarifiers used for this purpose can be run

with much higher throughput volumes when coagulant are dosed into the

medium beforehand. The outlet section of the lamellar clarifier is

usually dewatered - using polymers or flocculants to obtain a residue

that is solid enough to be spaded and disposed of.