Anaerobic Biodegradation of Polyvinyl Alcohol Modified by Extracellular Polysaccharides |
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Authors: | Josef Hrnčiřík Jiří Pšeja Jan Kupec Světlana Bernkopfová |
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Institution: | 1.Department of Food Engineering, Faculty of Technology,Tomas Bata University in Zlín,Zlín,Czech Republic;2.Department of Environmental Engineering, Faculty of Technology,Tomas Bata University in Zlín,Zlín,Czech Republic |
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Abstract: | This work focused on anaerobic biodegradation of blends composed of glycerol-plasticized polyvinyl alcohol (PVA) and biopolymer
(starch, gellan, xanthan) in an aqueous environment, after inoculation with digested activated sludge from a municipal wastewater
treatment plant. Glycerol degradability is comparable to degradability of used modifying agents. Modifying agents added in
the 20–40 wt% range proportionally increased biodegradation degree (Dt) calculated from balance of transformed carbon in the system. Biodegradation degree of polysaccharides and glycerol attained
95% and over. For PVA it was only 6.5% (in breakdown times up to 500 h). Content of polysaccharides favorably affects biodegradation
degree of polyvinyl alcohol blends, but at the expense of reduced mechanical properties of resultant products. |
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