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Paper des Monats
- ja (2)
Eingeladener Vortrag
- nein (35)
Reactive geomembranes and geotextiles are an innovative approach to control the migration of contaminants in geotechnical applications. Within a joint research project in cooperation with a medium-sized enterprise, the preparation and characterization of “reactive” geomembranes and geotextiles modified by the addition of zero-valent metal nanoparticles was performed. Zero-valent iron (ZVI) nanoparticles were added to polyethylene or to the fillings of geo-containers or geosynthetic clay liners. These geosynthetic products consist of mixtures of sand with clay or bentonite, typically embedded in geotextile nonwovens or geomats. The permeability of these geo-containers can be adjusted by the ratio of clay or bentonite to sand. ZVI nanoparticles were also added as reactive material to geomembranes made of polyethylene with additives like the antioxidant Irganox 1010 or glycerin. These additives prohibit oxidation of the nanoparticle and act as hydrogen donor in the dechlorination of chlorinated hydrocarbons. Contaminates such as chlorinated hydrocarbons and toxic heavy metal compounds are either decomposed or converted to less toxic species (e.g. Cr-(VI) reduction to Cr-(III)). The paper reports the first experimental results from manufacturing of the reactive geomembrane model materials and characterization of the products with microscopic techniques. First breakthrough measurements of the ZVI modified geomembrane compared to a reference sample are presented.
Antimon (Sb) wird in Industrieprodukten hauptsächlich als Flammschutzmittel in Kunststoff verwendet. Aufgrund solcher Zusätze in Kunststoffen landet etwa die Hälfte von Sb am Ende der Lebensdauer in der Verbrennung fester Siedlungsabfälle und folglich in relevanten Mengen in der erzeugten Bodenasche. Bei Kontakt mit Wasser ist die anfängliche Auslaugbarkeit gering, da Antimonat mit Ca2+ schwerlösliche Verbindungen bilden. Nach der Carnonatisierung der Verbrennungsasche (IBA) während der fortschreitenden Alterung nimmt der pH-Wert in den Sickerwasser ab. Mit abnehmender Ca-Konzentration im Eluat ändert sich das Lösungsgleichgewicht und Antimonate lösen sich auf.
In Deutschland ist beabsichtigt, Sb in IBA mit der geplanten Umsetzung der sogenannten Mantelverordnung (MantelVO, die Bestimmungen zur Verwertung von Mineralabfällen enthält) in naher Zukunft zu regulieren. Die im Entwurf festgelegten Grenzwerte können für IBA kritisch sein und stellen daher ein Risiko für die Verwendung der Mineralfraktion von IBA in den gut etablierten Recyclingwegen dar.
Many organizations in Europe collect data and perform research on municipal solid waste and the secondary raw materials that can be produced from them through recycling, urban mining, or landfill mining.However, the information generated and presented thereby is often highly aggregated, while research activities are many a time isolated. Both reduce the usability of the data and information generated. In order to better structure the knowledge generation on secondary raw materials production from municipal solid waste, we suggest to learn from the traditional raw materials mining Industry how to perform an integrated assessment and reporting of anthropogenic resources. This is exemplarily shown for the case of the anthropogenic resource municipal solid waste incineration bottom ash and airpollution control residues. A network of expert institutions from countries throughout Europe was build up to compile the information on legal and technological aspects for the recovery of different secondary raw materials from these residues, including construction minerals, metals, and salts. We highlight in our article the strength of the combined knowledge of an expert network not only on legal and technological, but also local and site-specific aspects of the recovery of secondary raw materials. By doing so, we hope to kick-off a discussion for how to organize and implement a structure for a better management of knowledge on anthropogenic resources, in order to provide a sustainable supply of secondary raw materials for a greener and more circular economy.
Wet-mechanical treatment: Processing of bituminous road construction waste in a jigging machine
(2023)
Jigging machines are used in processing technology in many areas. Examples are the processing of coal, ores, and primary and secondary raw and waste materials. Even small differences in density are offen sufficient for successful sorting. In the work presented here, milled material from road construction waste contaminated with bitumen is to be separated from uncontaminated material. In this way, scarce landfill space could be saved and mineral material be returned to the material cycle.
Werkstoffe
(2012)
Werkstoffe
(2008)
Waste, Evaluation Methods
(2019)
It is difficult to decide which waste management system fulfills best predefined sustainability goals such as maximum materials and energy recovery, least environmental impact, and lowest societal cost. Such decisions are based on many parameters. However, several evaluation methods exist with different scope and output, and the application of one or more evaluation methods provides an objective comparison of alternatives.