Sanitär- und Kommunaltechnik; Umwelttechnik
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Improving resource efficiency at the end-of-life stage is illustrated in this paper by the example of materials recovery from waste, here from residues out of municipal solid waste incineration (MSWI). With mechanical treatment valuable materials like ferrous and non-ferrous metals and secondary construction material can be extracted from MSWI bottom ash. The potential contribution on the resource efficiency will be discussed.
In order to estimating the amount and kind of emissions from polymeric sporting tracks a laboratory test was developed in BAM that combines artificial weathering and subsequent batch and column tests [1, 2, 3]. The goal consisted in nvestigating a possible change of emissions into soil and groundwater of a new sporting ground as a function of ageing and egradation of the system. At various stages of the weathering, the samples were removed and subjected to especially designed column extraction tests for the solid samples. Both these extracts and the accumulated rainwater run-off of the weathering device were subjected to analytical tests of their ingredients. The overall aim of the test consisted in developing ontrollable, reproducible, and standardisable conditions and methods of investigation that would allow an estimation of the emissions in the course of outdoor application of about five years.
Determining a pore structure’s mechanical and chemical data on lime rendering exposed
outdoors and including masonry in the laboratory, with regard to their behaviour on moisture
transport and weathering was the objective. In search of clues for a dose-response relation -
i.e. upon a connection between the emission rate of SO2 and NOx on one hand and the degree
of damage to mainly plaster having a lime component on the other - it has been of interest to
what extent their structural characteristics including pore space are modified and so
consequently also physico-technical properties and chemical composition. For determining
corresponding criteria, a widely diversified spectrum of test methods such as to obtain data
concerning porosity and moisture transport, mechanical behaviour, and chemistry as well is
available. A description of the manufacture of plate-shaped rendering specimens with lime
putty, industrially hydrated lime and dolomitic hydrate (the last two also having a cement
admixture) and also hydraulic lime as binding agents is included. First deposition velocity and
absorption rate for SO2 were determined in laboratory tests on these materials in dry and
moist states. After their exposure on outdoor racks at six locations in the Berlin region with
differing SO2 atmospheric contents over at least 5 years, the samples of course show timedependent
modifications of chemical and physical qualities which are especially reflected in
the form of profiles of structure, strength and concentration, e.g. for sulphate. Local climatic
differences, however, partly exert a greater influence on material than emissions. Similar
investigations were performed on samples of comparable composition exposed 4 and 17
years. But the real surprise is furnished by the renderings’ behaviour depending upon
orientation and upon height at a building. Since weathering behaviour and moisture transport
(absorption, storage, release) are directly interdependent, further criteria are necessary for a
critical assessment of a plasters’ pore structure. Starting from sands, plasters were
characterized. The structural parameters were lastly influenced by the respective contents of
sand, binder and mixing water. These results and those gained from bricks naturally find their
expression in masonry sections manufactured there from, and above all in their capillary and
evaporative behaviours, and also when applying different test liquids. Summary and cited
literature is given at the end of this report.