Towards optimized drum composting: evaluation of the radial mixing performance of a model substrate on the laboratory scale
| Autor: | Felix Brück, Ulf Theilen, Harald Weigand, Jonas Schneider, Jan Michael Burg |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Composting 0208 environmental biotechnology Mixing (process engineering) 02 engineering and technology General Medicine Substrate (printing) Drum 010501 environmental sciences Entropy of mixing Laboratory scale 01 natural sciences 020801 environmental engineering Soil Rotating drum Environmental Chemistry Composite material Laboratories Waste Management and Disposal Triticum 0105 earth and related environmental sciences Water Science and Technology |
| Zdroj: | Environmental Technology. 41:1606-1613 |
| ISSN: | 1479-487X 0959-3330 |
| DOI: | 10.1080/09593330.2018.1543354 |
| Popis: | The rotating drum composter (RDC) is one of the most widespread reactor systems for biowaste treatment, worldwide. Nevertheless, knowledge on optimum operating conditions including, e.g. fill level, turning frequency, and mixing tool configuration is sparse. This study investigated the effect of static mixing tools (SMTs) on mixing in a rotating drum at high fill levels (60–80%). The methodological approach encompassed mixing experiments in a laboratory RDC using soaked wheat grains as a model material. The temporal course of material blending was quantified in terms of the entropy of mixing using digital image analysis. Experiments without SMTs showed the evolution of unmixed cores. With a single SMT, mixing was superior even at fill levels >70% while peripheral unmixed zones persisted when overly long SMTs were used. The results of this study may help to derive optimal process conditions for RDCs operated at high fill levels. |
| Databáze: | OpenAIRE |
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