Waste Technology
Testing of a stage-by-stage process for the recovery of metals from askarel-cooled capacitors and transformers
Through the progressive adaptation and modification of a method which has been tested on a laboratory scale, a stage-by-stage process has been developed for the complete decontamination of PCB-contaminated metals, thereby allowing the latter to be recirculated in the material cycle. Even the toxic materials released are suitable for recycling by an appropriate method.
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Comprehensive investigations for the identification of potential sources of health hazards and environmental pollution associated with the collection and composting of biowastes have been undertaken. Results obtained will form the basis of appropriate measures for biowaste bins and composting plants.
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The development of a triboelectrical method to process films taken from the float fraction during the recycling of plastics in accordance with the German Packaging Ordinance
The new combination of methods is characterised by selective agglomeration with subsequent corona charging and separation. According to the research results, it is primarily suitable for recycling the plastic packaging of dairy products.
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The effect of alteration of material flows in the waste industry on the future quality and utilisation options for waste incineration slags
Investigations were undertaken in order to correlate the composition of waste input and the mineralogical, environmentally-relevant and structural properties of the resultant slags at ten waste incineration plants. It was noticed, for example, that fluctuations and changes in the waste input, e.g. a combination of normal waste with bulky waste, have an effect on the mineralogical phase composition of the fine fraction.
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Negative skin friction due to settlement of domestic waste was recognized to be the cause of damages of shafts in a landfill. The usual methods of statical calculation turned out to be improper within landfills. A settlement compensating gravel haunched shaft-structure based on the telescope principle was developed. The working order of the system was demonstrated until a landfill height of approximate 70 m. The telescopic effect worked as planned. The radial deformation and soilpressure overpassed the previsions without endangering the stability. Measures to be taken in order to reduce the negative skin friction are proposed (further information in German).
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The impact of the waste composition on the pollutant content and quantity of combustion residues - Phase 1
The objective of this Projekt is to identify organizational and technical measures fit for reducing or eliminating problematic substances, inert and bulky waste from the material meant to be incinerated. The feasibility of potential measures was investigated in terms of financial, technical and social acceptability. Also the overall benefit of each measure was defined. Based on this assessment, a list of priorities was set up as to which measure should be implemented first.
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The treatment of abrasive sludge in order to recycle its components: Design of a database and simulation system
This system is a basis for the proper operation of plants for treating abrasive sludge. For example, after the components of a particular sludge are entered, it can give the user the required process parameters for treatment or, after selecting a plant configuration, the different compositions of the abrasive sludge to be treated there.
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The treatment of abrasive sludges in order to recycle its components: Concepts for production plants
This project indicates how to locate an optimal site for the treatment of abrasive sludge – whether a centralised, decentralised or mobile plant configuration should be considered, and how the internal transport of abrasive sludge should be done.
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The treatment of abrasive sludges in order to recycle its components: Coordination and smelting process
Using vacuum oil removal, drying and briquetting, abrasive sludge can be processed into an oil-free solid that blends negligibly with other recyclable materials and exhibits high strength. Recycling this solid into production processes leads to environmentally friendly and efficient material cycles.
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Thermal recovery of mixed plastic wastes: Optimisation of processes for the environmentally acceptable recycling of waste materials. Subprojekt 1
On the basis of waste analyses, a procedure for the separation and treatment of substantially non-recyclable plastic wastes was developed in order to use the resulting product as alternative fuel in cement works.
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