Recovery of Metals from Sewage Sludges and Incineration Ashes by Means of Hyperaccumulating Plants
Sewage sludges as well as ashes from waste incineration plants are known accumulation sinks of many elements that are either important nutrients for biological organisms (phosphorus, potassium, magnesium, etc.) or valuable metals when considered on their own in pure form (nickel, chrome, zinc, etc.); they are also serious pollutants when they occur in wild mixtures at localized anthropogenic end-of-stream points.
Austria and many other countries have to import up to 90% of the material inputs of metals from abroad. These primary resources are becoming more expensive as they become more scarce and remaining deposits more difficult to mine, which is a serious concern for industrialized nations. Basic economic and strategic reasoning demands an increase in recycling activities and waste minimization. Technologies to recover metals in a reasonable and economically relevantmanner from very diffuse sources are practically non-existent or require large amounts of energy,complex equipment and chemicals with potentially high environmentall risks. Agriculture uses large volumes of mineral fertilizers, which are often sourced from mines aswell, and are also subject to the principle of finiteness and potential shortages. These assimilated biological nutrients through the food chain and human consumption end up in sewage systemsand wastewater treatment plants in great quantities. In Austria, they mostly do not return to agriculture, but due to contamination with heavy metals are diverted to be used as construction aggregates or are thermally treated and end up rather uselessly in landfills.
| Copyright: | © Lehrstuhl für Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben | |
| Source: | Depotech 2014 (November 2014) | |
| Pages: | 1 | |
| Autor: | Heinz Gattringer  Johannes Kisser Monika Iordanopoulos-Kisser | |
| The library including buying options has moved to https://library.wasteculture.com Previously purchased articles can still be downloaded via myASK. | ||
These articles might be interesting:
Development of local municipal solid waste management in the Western Transdanubia region of Hungary
© Lehrstuhl für Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben (11/2020)
Hungarian municipal solid wastes (MSW) management has developed tremendously over the past 15 years. More than 3,000 landfills and dumps had been closed, just to mention one improvement. However, still, lots of work is necessary to accomplish the EU’s ambitious aim of decreasing landfilling and increasing recycling and composting.
Steel Slag Asphalt: Preventing the Waste of a High Quality Resource
© Lehrstuhl für Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben (11/2014)
Steel slag is the inevitable by-product of the production of steel, from both the conversion of iron to steel and the recycling of steel scrap. Historically, this material has been sent to a landfi ll as waste, but over the last 100 years or so, a variety of uses have been found for what has proven to be a high quality, valuable resource. With this in mind, the steel industry within Europe now consider iron and steel slag to be products and not waste and as such have registered the materials under Reach (Registration, Evaluation Authorization and Restriction of Chemicals). Steel slag is formed by the addition of lime to the molten metal in order to remove impurities and to control the quality of the steel. The resultant slag is a complex mineral formed from oxides of calcium, aluminium, silicon and magnesium along with various other trace elements. Once cooled, the slag forms a crystalline rock that can be used as a replacement for natural aggregate in a variety of construction products, including asphalt. This paper specifi cally focuses on the use of steel slag as aggregate for asphalt mixtures in road construction and addresses the processing and quality control of the slag, along with its properties and the benefit of these properties for Asphalt materials.
Lohnende Investition - Der Recyclingpark Eisenerz verwertet Schredderabfälle
© Deutscher Fachverlag (DFV) (4/2008)
Im alten obersteirischen Eisenzentrum Eisenerz, am Fuß des Erzberges (Österreich), läuft seit mehr als zwei Jahren die erste Aufbereitungsanlage in Österreich für die Shredder-Leichtfraktion. Die Erfahrungen sind so gut, dass die Kapazität verdoppelt werden soll.
Kettenreaktion - Neue Wege im Recycling von Müll-Schrott-Gemischen
© Deutscher Fachverlag (DFV) (2/2008)
Die Anforderungen in der Recyclingbranche unterliegen einer ständigen Entwicklung. Hervorgerufen durch verschärfte
Gesetze und Bestimmungen, suchen die Entsorger nach neuen Methoden der Abfallaufbereitung. Auch die Firma Scherrieble Sekundärrohstoffe AG stand vor diesem Problem und ging einen komplett neuen Weg.
Gute Entwicklungschancen
© Rhombos-Verlag (1/2008)
Die deutsche Entsorgungswirtschaft verfügt über ein großes Potential für Umwelttechnik und Arbeitsplätze
