Cleanup Technology
Biological remediation of contaminated sites: development of microbiological/adsorptive methods for in-situ decontamination
For in situ and on site treatment of PAH contaminated soils biotechnological methods were developed and applied. Several reactor types for biotreatment of contaminated soil were tested in order to estimate an optimum degree of PAH removal from different types of soil. For the treatment of silty soils a hydraulic fluidized bed reactor proved to be most suitable.
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Biomanipulation as an ecotechnology to control lake eutrophication: possibilities to increase effectivity and applicability of biomanipulation
The biomanipulation process improves the quality of water through the optimisation of its ecological structure. Biofiltration by zooplankton can be maximised by the targeted structuring of fish stocks in the waters concerned. The applicability of biomanipulation in relation to key background conditions has been successfully summarised in tabular form.
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Bioremediation of carbo-chemical contaminations: Controlled humification of PAHs (Technological development and process optimisation, coordination)
The decontamination process developed for polycyclic aromatic hydrocarbons in polluted soils allows the technical exploitation of naturally-occurring humification processes for the removal of contaminants. By this method, polycyclic aromatic hydrocarbons are oxidised to form carbon dioxide and water. In practice, this method represents a sustainable and cost-effective clean-up technology.
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Bioremediation of carbo-chemical contaminations: controlled humification of PAHs (Technological development)
Essential components for the conditioning of contaminated soil material have been developed for the application of the “controlled humification of PAHs” as a clean-up technology. Work undertaken for this project concluded with the completion of scheduled preparations for the experience-based testing of this technological development.
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Bioremediation of soil -assessment of the long-term behaviour / remobilisation of bound contaminants (TNT and PAH)
The four simulated biological remediation techniques led irreversibly to the determination of polycyclic aromatic hydrocarbons and trinitrotoluol in the humus matrix. These results were determined in long-term experiments on a pilot scale, in order to ensure relevance in practice.
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Bioremediation of soil: Analysis of bonds of bound residues derived from TNT in soil after biological treatment and remobilization-tests
The biological treatment was effective and the „bound residues“ were resistant to environmental stresses to a large extent. Highly stable amide bonds of the labelled nitrogen are the resulting bonds to organic soil matrix, which take part in the process of humification.
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Bioremediation of soil: alternating anaerobic/aerobic process analysis of the bonding structure of metabolised and humified TNT in the soil
The tested composting method appears to be suitable for rehabilitating soil contaminated with high levels of TNT. An investigation of the former armaments site Clausthal-Zellerfeld found that the deoxidised TNT metabolites bonded with water-soluble humic substances after conversion.
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The project's aim is to characterise aged creosote phases and to quantify the release processes and their kinetics. The data obtained from the experiments are to provide a reliable quantitative assessment of the release of polycyclic aromatic hydrocarbons from aged real creosote phases.
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Keywords:
Bodenkontamination, Monitored Natural Attenuation, PAK, Freisetzung
Cleanup technologies for inorganic pollutants in the underground environment: in-situ immobilisation of arsenic compounds in a water-saturated environment
In practice, the cleanup process developed should preferably be used for the decontamination of small areas. Iron hydroxide is used as an immobilisation reagent. Tests have also shown that the funnel-and-gate technique represents a practicable alternative to protective measures which have customarily been applied hitherto.
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Cleanup technologies for inorganic pollutants in the underground environment: recovery of samples, technical support trials and the modelling of flow and transport characteristics
The use of permeable reaction walls represents a practicable alternative to the cleanup measures which have customarily been applied hitherto to arsenic-contaminated sites. Conversely, the in-situ immobilisation process using iron hydroxide, which has been tested in a pilot plant, has proved to be of only limited practicability.
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