Fundamental drying experiments with processed residual municipal solid waste materials
Waste management companies and municipalities in southwestern Hungary aim the fulfillment of the EU’s target, namely to decrease landfilling below 10 % and increase recycling above 65 % of municipal solid wastes. However selective collection is continuously improved there is still high amount of residual MSW is generated. A new mechanical RMSW processing plant (20 t/h) and an experimental RDF pyrolysis plant (200 kg/h) had been built (Faitli et al. 2020) and now extensive research is being carried out to solve the local utilization of the bio-fraction and the RDF. This is the reason why this fundamental drying research was necessary. Dryer classification and the selection of the best solid waste drying techniques vary significantly due to the vast range of waste to be dried and the inherent challenges of dealing with non-standardized systems. In general, biomass dryers may be categorized according to their heat transmission technique and the physical qualities of wet particles.
The EU’s circular economy concept necessitates the increasing of the recycling ratioof municipal solid wastes. There are many existing mechanical – biological processing plantsin Hungary for the preparation of residual municipal solid wastes (RMSW). The two most importantproducts of these plants are the so called bio-fraction and the RDF (refuse derived fuel).Currently there are problems with both of these material streams in Hungary, namely most ofthe bio-fraction is still landfilled and the local thermal utilisation of the RDF is not solved yet. Thehigh moisture content of the produced bio-fraction and RDF causes difficulties for the downstreamoperations; therefore drying of these materials has a recent engineering interest to improve.Authors have carried out a systematic drying experimental series where the effect of thematerial, material composition, mass (volume or surface) of material and particle size distributionon drying intensity were studied in a 1 m3 oven. The initial slope of the relative moisture lossas function of time was determined. Process engineering design methods of convective hot air drying can be further developed taking into account the research results.
| Copyright: | © Lehrstuhl für Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben | |
| Quelle: | Recy & Depotech 2022 (November 2022) | |
| Seiten: | 6 | |
| Preis inkl. MwSt.: | € 3,00 | |
| Autor: | Dr. József Faitli  Z.N. Abdulfattah N. Yanar | |
| Artikel weiterleiten | In den Warenkorb legen
| Artikel kommentieren |
Diese Fachartikel könnten Sie auch interessieren:
Fette Beute bei den Wertstoffen? – Optimierung entlang der Erfassungskette vom Haushalt bis zum Recycling
© Universität Stuttgart - ISWA (9/2014)
Der alte Filmklassiker „Auf der Jagd nach den grünen Diamanten“ hat eine ungeahnte Aktualität erreicht, nur dass es längst nicht mehr nur um Diamanten oder andere „klassischen Edelmetalle“ wie Gold geht, sondern
um „schnödes“ Kupfer, Aluminium, und auch, viel feiner und kleiner, um die kritischen „selteneren“ Rohstoffe, wie Indium, Gallium oder Neodym. „Tiffany’s“ liegt heute am Wertstoffhof und Edelmetalle sind längst „the industry‘s best friend“.
Optimierte kommunale Erfassung von Elektroaltgeräten, Lithium-Jonen Akkus und Waren zur Wiederverwendung
© Lehrstuhl für Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben (11/2022)
Die Idee, Elektrogeräte überdacht am Annahmetisch anzunehmen sowie gut
erhaltene Dinge aus dem Abfallstrom zu retten und für die Wiederverwendung zu erhalten, wurde im Modellprojekt Dasing realisiert. Alle Beteiligten im Landkreis Aichach-Friedberg, von Politik bis Presse, von den Mitarbeiter:innen bis zu den Besucher:innen der Wertstoffhöfe sind mit der Materie vertraut und der Umsetzung mehr als zufrieden.
The AHOY-Project: Waste Wood Sorting with X-ray Technology
© Lehrstuhl für Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben (11/2022)
Waste wood is a valuable resource, but is hardly recycled despite increasing demand, predicted supply gaps (Mantau et al. 2010), and galloping wood prices since 2020 (Trading Economics 2022). In Germany alone around 10 million tons of waste wood accumulated in 2016. Only a minor part (1.7 million tons) is substantially reused in the production of chipboards. The majority (7.7 million tons) is fed into energy recovery, i.e., burned in one of the 80 German waste wood power plants (BMUV 2021), and is thus lost, while the supply of fresh wood is limited by slow growth cycles and finite acreage. In view of current environmental regulations, climate change and massive tree mortality, waste wood should be kept permanently in the circular economy as a high-quality raw material in the future.
Mechanical short-term and long-term properties of PP recyclate blends
© Lehrstuhl für Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben (11/2022)
The amount of recycled material in new products should be increased in the next few years. By adding virgin material, the mechanical properties of the pure recyclate can be improved. In this work, 10 % and 40 % post-consumer recyclate was added to a virgin material and analyzed. Both raw materials were also tested. The short-term as well as the long-term properties decrease with increasing recyclate content. The recyclate has a higher influence on the young’s modulus, yield stress and slow crack growth resistance than on the notched impact toughness.
Analysis of different polypropylene waste bales – evaluation of the source
material for polypropylene recycling
© Lehrstuhl für Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben (11/2022)
In 2020 Polypropylene (PP) accounted for almost 20% of the plastic consumption in Europe, making it the second most used plastic (Plastics Europe 2021). Due to the high volume of PP used as packaging material (Plastics Europe 2021), large amounts of PP waste are generated every year. Therefore, mechanical recycling of PP waste is a crucial step towards a circular economy. Although there are already some well-established recycling techniques, the lower quality of recyclates compared to virgin materials still poses an obstacle for their use in more demanding applications. Improvements of every step of the whole recycling value chain could solve this problem, with proper and more accurate sorting techniques being particularly crucial.
