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Packaging waste is a significant portion of municipal solid waste. It is made mainly of polymers of petroleum, which are usually non-biodegradable and are in many cases difficult to be recycled or reused. In recent years, the development of biodegradable packaging materials from renewable natural resources has gained more attention, especially in the EU. The use of biodegradable materials is expected to have a lower environmental impact than traditional materials based on non-renewable raw materials. The LCA environmental impact analysis of biodegradable plastic used in the packaging industry and comparison to other materials as well as the results of physicochemical analyzes are presented here, in addition to a discussion on the effects of replacing petroleum materials with biodegradable materials.
Degree of poly (lactic acid) (PLA) foil degradation by the filamentous fungi i.e. Aspergillus ustus, A. sydowii, A. fumigatus, Paecilomyces lilicanus and Penicillium verrucosum has been investigated. A degradation process has been conducted in dynamic conditions at 30°C for 10 days in a medium containing 0.1% of foil as carbon source. To activate the enzymes involved in the poly (lactic acid) foil degradation, triple passaging on the medium has been conducted. Each passage lasted 10 days. After passages, increase of the mycelium biomass, its enzymatic activity and structural foil changes have been investigated using scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). Strain passaging has resulted in the activation of the enzymes of the esterase group responsible for foil degradation, expressing itself in the mycelium biomass increase. Penicillium verrucosum and Aspergillus ustus appeared to be the most active strains. Structural and thermal changes of the material have been demonstrated. Filamentous fungi have a wide range of enzymes of the esterase group which, following initial activation, may actively participate in PLA foil degradation.
The objective of this paper is to zoom in on the system of separated waste collection in Czech Republic (CR). The system of packing waste collection is described. The analysis of collection of base commodities of communal waste (paper, plastics and glass) in chosen regions has been carried out. St edo eský region has been chosen because of the number of its inhabitants and as well because of its location in the middle part of CR and because it neighbours with the Czech capital city, Prague. Region Vyso ina shows average values in base commodities collection. The results of the chosen regions are being compared to the present status of separation of these wastes in CR which is counted by packing company EKO-KOM. The company caries out back withdrawal and usage of wastes of mentioned packages.
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