Chlorinated solvents, such as: tetrachloroethylene (Per) and trichlorethylene (Tri) were widely used in dry cleaners, metal processing and print shops. Often the use resulted in severely contaminated soil. Chloroethanes distinguish themselves from chloroethene and are not quite so biodegradable.
In a collaboration between T & K Service and Deltares, in Barneveld an in-situ chloroethanes and chloroethene decontamination is being implemented. With a cocktail of dehalococcoides spp. and Dehalobacter spp. bacteria, chloroethanes and chloroethene are broken down into the harmless components of ethylene and ethane, via reductive dechlorination. Over a 2 year period of time, the concentrations in the source zone have dropped from >100,000 ug/l to less than the detection limit in multiple monitoring wells.