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Ce projet, appele ci apres 'programme', est soumis par l'ensemble du module 2 du PP-Environnement. Les moyens financiers seront utilises pour des besoins communs au module. Le programme a pour but (i) la mise sur pied d'une structure de cooperation Suisse multidisciplinaire, entre les differents groupes de recherche actifs dans les cycles biogeochimiques, (ii) en catalysant cette cooperation au moyen d'un projet experimental commun. Pour jouer pleinement son role de catalyseur, ce projet doit etre accepte par la majorite des groupes et permettre la participation d'un maximum d'entre eux. Pour cette raison le programme comprendra les phases suivantes: - rassemblement et synthese des informations sur les differents groupes: competences, appareillage disponible, projets en cours, etc.. - organisation de workshops pour definir la structure de cooperation optimum, et la nature du projet experimental commun. Evaluation de la faisabilite du programme; - realisation du projet commun avec workshops de coordination et discussion des resultats; renforcement de la structure de coordination; - synthese des resultats experimentaux; evaluation concernant le developpement de la structure de cooperation; preparation de la deuxieme etape du PPE. La nature precise du projet commun sera discutee par l'ensemble des participants, lors de workshops. Ce projet respectera les grandes lignes definies dans le plan d'execution du PPE en mettant l'accent autant que possible sur l'etude des flux de composes chimiques dans un ecosysteme complet, les relations entre micro- et macro processus et le developpement de technologies nouvelles specifiques (mesures in situ, modelisation..). On envisage d'etudier, par les differents groupes participant au projet commun, un certain nombre de processus complementaires pour comprendre la circulation de composes chimiques dans un seul ecosysteme (sol, lac, sediment, riviere, etc.). (FRA)
Metal hydroxide and paint sludge's are produced during pretreatment and paint spraying of metal surfaces and have to be considered as industrial waste due to the heavy metal content. Sulzer Chemtech is studying the pyro-processing of the sludge's in a pilot plant with an operational capacity of 20 to 100 kg/h. The purpose of this project is a save reintegration of the products in the ecosystem. The organic compounds are partial pyrolised in a fluidized bed at temperatures from 600 to 800 degree C. The inorganic compounds are vitrified subsequently in the temperature range of 1100 to 1400 degree C. By vitrification of metal hydroxide sludge in a very high reducing atmosphere, the glass can be depleted to a heavy metal concentration comparable to the crust of the earth. During melting, a heavy second phase is formed consisting of iron, copper nickel, chromium and tin alloys. Zinc and lead are almost completely evaporated. In the glass matrix, a phosphate and a silicate phase are coexisting. On the other hand, a low reducing atmosphere causes an incorporation of iron, lead and zinc into the glass structure. The evaporation of zinc and lead is low. Metal hydroxide and paint sludge's contain ecotoxic components like heavy metals and organic substances. They are classified as hazardous wastes and may not be disposed of by land filling anymore. Two different paths for immobilization and separation were investigated. Thermal treatment below melting temperature leads to an inert insoluble residue with minimal energy requirement. In an alternative process the sludge's are vitrified after a suitable pretreatment. A favorable choice of operating conditions allows a substantial separation of the heavy metals and the decomposition of the organic material. The high energy consumption, however, is only justified, when an upgrading of the products for further reuse is achieved. Separation of the heavy metals below melting temperature is the objective of a new project phase.
Leading Questions: Which aspects must be included in ecological valuations? How depends the result and the accuracy from system boundaries, examined aspects and so on? Abstract: The purpose of this project is to show the possible application fields of the fuzzy set theory in ecological valuations (LCA). This application fields are to be demonstrated in the coordinated project 'LCA of the Feldschloesschen-brewery'. Our work focuses on two topics of ecological modeling: a) Threshold values (TV) are used in LCA methods as weighting parameters to put emissions of different harmful substances in one single 'scale of harm'. The purpose of TV, to protect the whole nature, is defined linguistically by the law. Fuzzy Sets are a much better representation of linguistic definitions than crisp numbers. The modeling of specifical fuzzy-TVs, their synthesis to one TV and the extraction of a crisply defined TV has shown that the fuzzy set theory can be used as a flexible tool for modeling of the meaning of an TV. b) Complex systems in LCAs are sometimes difficult to define. The problems are the inclusion of qualitative data and the lack of exact knowledge about nature. With knowledge-based systems it is possible to 'build' intuitive models based on expert knowledge and to use qualitative data and estimations together with exact data. It is also possible to include synergetic effects which are known only qualitatively. Such a fuzzy model has been constructed for an LCA of Swiss agriculture. Complementary information: Development of a new valuation method on the basis of Fuzzy logic. This mathematical concept allows a better representation of the real world.
In the catchment area of the Noiraigue system two types of waters are present: 1. weakly polar, acid, reduced waters with organic material stemming from natural peat bogs and 2. moderately polar waters containing organic material stemming from improved swamps. The two waters mix with each other and are thereby neutralized before entering the karst drainage system. The colloid's nature, fluxes and impact on the neutralization is the main topic of the present investigation. Since fluxes are highly dependent on season and rain fall, the study of the hydrologic systems is an important part of this project (subproject A). Since colloids are partially produced by biologic activity, the microbiologic system is studied in subproject C (e.g. Gallionella). During transport in the karst system, the waters loose about half of their organic material content. Colloids at the karst spring will be compared with those at the karst entrance in order to quantify the influence of the residence time within the karst system as well as transport and oxidation processes. Tracing of bacteria using bacteriophages will permit to quantify the transfer time of organic particles of 1 mym size in comparison with the smaller colloid particles.
Leading Questions: Is the microbial diversity of our soils influenced by actual heavy metal pollution? What is the distribution of the microbial diversity with respect to heavy metal pollution and with respect to different soil types (climates)? How are microbial community structure and resilience of the soil microbial community related? How does the adaptation to heavy metal load change the microbial community structure; and is the consequence of this change a modification in the ability of this community to respond to natural disturbances? How are the above interdependencies related to environmental variability (seasons)? Abstract: This project addresses two yet unresolved problems which affect our understanding of soil ecology and our capability to formulate ecological soil quality standards: 1. How diverse are the soil microorganisms in our soils and how is their diversity related to the soil properties and the known and broadly confirmed heavy metal pollution? 2. How are the complexity and the stability, in the meaning of the resilience, of a given soil community related? To clarify these questions we developed methods which are based on the analysis of the phospholipid fatty acids (=PLFA) extracted from the living soil organisms. Our first results showed that our methods allows to compare biodiversity and soil resilience of a large variety of soil samples and to classify microbial soil communities. Complementary information: The proposed study involves a two-step objective. The first objective is to assess the microbial diversity and community structure as a function of different soil types (from 30 localities in Switzerland, including lowlands and mountainous regions), climatic conditions and different levels of heavy metal loads (natural background levels, pollution sites). As the second objective, a subset of the assessed soils will be tested for their resilience towards a glucose pulse (a sudden increase of an easily degradable biotic substance occurring naturally in soil habitats during spring and autumn). This allows for the experimental investigation of the theoretical interdependence of this one aspect of stability along with complexity. To our knowledge such studies still do not exist, although they may be very important in judging the fate of our soil systems and ecosystems in general.
How can residues from waste incinerators be recycled? Two complementary vitrification systems for waste incineration residues developed by ABB: - The Deglor-system: a glass furnace based process operating with an oxidizing atmosphere, suited for small and medium throughputs (treatment of fly ashes). - The AshArc-system based on a DC hollow electrode arc operating under reducing conditions, suited for large throughputs (bottom ashes with or without fly ash, fly ash in very large incineration plants). Aims of the SPPU-project: The aim of the joint SPPU-project was to study the composition and properties of the produced glass-like residues a function of the operation conditions in the respective furnaces. The results of these investigations should give facilitate the production of valuable and usable products from these residues. Contributions within the SPPU-project: Our main contribution was the operation of our test and pilot facilities under specified conditions. Samples of the resulting glass were analyzed in detail by EMPA Duebendorf, investigating both chemical and physical properties of the glass. The topic of valuable products from the vitrified material was followed up by EMPA St. Gallen. At PSI small scale fundamental experiments concerning the evaporation of heavy metals were performed. Some summarized results: The vitrification of different incineration residues (fly ashes with and without flue gas cleaning products, fine fractions of bottom ashes) did always result in glass products showing a good leaching resistance. A huge data base characterizing these products was gained. - A method to determine the retention time of materials in the Deglor furnace was successfully tested. Based on this method, the positive effect of a longer retention time in the furnace was demonstrated revealing a more complete evaporation of most heavy metals and of chloride and sulfur. The special case of zinc was investigated in depth by the PSI. - A 2 t/h AshArc test run under reducing conditions revealed very low residual heavy metal contents in the glass. - The physical characterization of the glass gave new input concerning the use of this materials for added value products like vitreous ceramics. This has to be further investigated. Very promising is the use of the glass as a partial substitute for cement in slowly binding concrete.
The project examines the influence of colloidal particles on biochemical cycles of nutrients, radionucleides and heavy metals with the aid of models and tracer experiments. The joint object of research is Lago Ceresio (Lugano). The results will be used to elaborate clean-up measures.
Leading Questions: a) Contribution to soil biology b) Global, multi-scale approach to biodiversity in an edaphic environment c) Maximum integration of research realized on two different but interacting functional levels d) New application of analytical methods e) This research is oriented in the direction of establishing a biodiversity-derived diagnostic for fertility in agricultural environments. f) Interdisciplinarity. Abstract: In the soil, the diversity of the components of the decomposition chain gives an indirect measure of soil-fertility. But the organisms involved work at different scales. Thus, studying their interactions requires a simultaneous evaluation of the faunas tic diversity and the microbial spectrum. Here we evaluate diversity of macro arthropods, micro arthropods and micro flora (fungi and bacteria) on the same samples. The measures are compared with each other, and put in relation with the biochemical traces of biological activity in the soil, which give another measure of soil fertility. The measured traces are selected enzymes, ATP content, and CO2 release. Biodiversity is thus studied for itself and compared over several scales (with organism sizes ranging from the cm to the um), but applications are also expected, in the form of biodiagnostic techniques of soil fertility, pollution monitoring, or risk assessment related to the application of sanitation techniques on heavily polluted soils.
Kann die Bodenfruchtbarkeit von schwermetallbelasteten landwirtschaftlichen Flaechen mit schwermetallakkumulierenden Pflanzen wieder hergestellt werden? Je an einem Standort mit Cadmium- und Zinkbelastung wurden 1993, 1994 und 1995 Feldversuche mit Hyperakkumulatoren (Wild- und Kulturpflanzen) durchgefuehrt. Die beiden Wildpflanzen (Thlaspi caerulescens, Alyssum murale) zeigten ein respektables Wachstum, wegen der unregelmaessigen Keimung und geringen Groesse aber einen kleineren Ertrag als die hyperakkumulierenden Kulturpflanzen (Maiszuchtlinie, Tabak, Indischer Senf, Weiden). Alle Pflanzen nahmen im Vergleich zu 'normalen' Kulturpflanzen (Chinaschilf, Rettich, Raps, Krautstiel, Maishybrid) aber deutlich mehr Schwermetalle auf. Speziell interessant ist die hyperakkumulierende Wirkung bestimmter Weidenklone. Bei dieser Pflanze ist bereits heute sowohl ein hoher Ertrag wie eine gute Cadmiumaufnahme moeglich.
Obwohl schon seit einiger Zeit recht erfolgreich mit biologischen Umweltsanierungen gearbeitet wird, fehlt es bis heute an Grundlagenwissen um die verschiedenen Methoden zu optimieren. Ein Problem stellt insbesondere der Nachweis sowie die Bestimmung der Aktivitaet von zugefuehrten Prozess-Mikroorganismen dar. Waehrend aeltere Arbeiten meist ein rasches Absterben von freigesetzten Mikroorganismen mit der Plate Count Methode gefunden haben, wird in neuen Untersuchungen ein Ueberleben nachgewiesen. Es geht bei den vorgeschlagenen Arbeiten darum, diese Methoden zu Verbessern und mit ihrer Hilfe den Erfolg von zugefuehrten Bakterienstaemmen zu ueberpruefen.
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