IN SITU DETERIORATION OF COMMERCIAL BIOBASED POLYURETHANES FOAMS BY POULTRY BEDDING COMPOSTING
DOI:
https://doi.org/10.6008/CBPC2179-6858.2021.009.0034Keywords:
Polyurethane, Deterioration, CompostingAbstract
Polyurethane (PU) foams, with rigid and flexible structures, are commercial materials widely used due to their versatility. However, the problems caused by improper disposal and low degradability in the environment of this polymer class has led to the search for alternatives to minimize these impacts. The use of raw materials from renewable sources to produce polyurethane foams as well as composting should be considered. Composting has also become an option for the main poultry waste, poultry bedding. This study aimed to evaluate the deterioration in situ of polyurethane foams in composting poultry bedding. The foams remained buried for 90 days in static compost piles outdoors. Composting was accompanied by the measurement of temperature, humidity, carbon and nitrogen content. The foam samples were evaluated morphologically and gravimetrically. The composting environment of the poultry litter promoted physical and morphological changes in the foams, such as cracks, holes and roughness, and color change. All PU samples showed mass changes during composting, however, following an order of semi-flexible > flexible > rigid. Finally, the destination of PU foams from renewable base in static composting of poultry bedding proved to be viable as well as a useful environment for physical-chemical and microbiological deterioration.
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