[Technical in situ methods and their environmental hygiene control during the biological purification of soil and groundwaters polluted by organic halogens].

The contribution deals with the following topics: --A possible utilization of the biological soil remediation techniques. --Laboratory investigations for remediation projects. --Development of pilot treatments projects.

[Hydrocarbons and chlorinated hydrocarbons in groundwater].

The contribution deals with the following topics: --Microbiological in situ investigations of polluted ground water aquifers in order to develop a concept for biological remediation. --Removal of organic and halogenated organic compounds from ground water using methods which are common in the drinking water treatment (sand-fastfiltering, immobilized reactors). --Removal of organic and halogenated organic compounds from ground water using methods which are common in sewage treatment (activated sludge, suspension reactors).