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- Title
MSW Biodrying in the Czech Republic.
- Authors
Benešová, Libuše; Pilnáček, Vojtěch; Závodská, Anita
- Abstract
Waste management in the Czech Republic is currently facing a number of challenges. One of the most difficult is the treatment of municipal solid waste (MSW) because of the considerable heterogeneity of the material as a result of, among others, seasonal, household and social variability. MSW is managed according to two directives under European Union (EU) legislation: Directive 2008/98/EC which governs waste and Directive 1999/31/EC which governs the hierarchy of waste management. An upcoming change in these two directives calls for EU member states to increase reuse and recycling up to 70% by 2030 while decreasing landfilling as much as possible. One of the ways of meeting this goal is by biodrying MWS. Biodrying is employed to decrease the overall weight of the waste where the heat produced by the aerobic decomposition of the organic components dries the waste. Air can also be introduced into the waste to reduce humidity as part of the process. A study on the efficacy of biodrying was carried out employing a controlled air supply. A 1 m³ sample of freshly collected MSW weighing 30 kg was crushed to a grain size of approximately 30 mm and following selection via quartering, the sample was dried. The system was set up such that if the sample temperature dropped below 42°C, the air source would be activated and if the temperature reached above 45°C, it would be deactivated. Previous studies indicate that when air is supplied during the process from only one direction temperature and moisture gradients form within the waste, so samples in this study were collected from two layers of the reactor - the top and bottom. Initially, the humidity of the waste was 41.28%. After 257.5 hours, the levels were 13.74% and 23.87%, in the lower and upper layers, respectively. The initial calorific value of the waste was, on average, 9,077 MJ/t and after the biodrying process it was 15,415 MJ/t and 13,818 MJ/t in the lower and upper layers, respectively. The total volume of air consumed during the process was 538,707 m³.
- Subjects
CZECH Republic; EUROPEAN Union countries; MUNICIPAL solid waste incinerator residues; WASTE management; INDUSTRIAL waste &; the environment; AIR quality; BIODRYING
- Publication
Journal of Solid Waste Technology & Management, 2015, Vol 41, Issue 4, p283
- ISSN
1088-1697
- Publication type
Article