Abstract
Anaerobic degradation of eight commercially available biodegradable polymers was compared in two anaerobic tests using digestion sludge, according to ISO 11734 and ASTM D.5210-91. Cotton, polyhydroxybutyrate/hydroxyvalerate copolymer (PHB/PHV), starch blend, thermoplastic cellulose acetate, and cellulose acetate fibers proved to be anaerobically degradable, but only a low extent of degradation was found for polylactide, polyvinylalcohol, and polycaprolactone. Both test methods gave the same overall results, but with the ISO medium, longer lag phases and greater ranges of variation in the results were observed. These effects are presumably due to low concentrations of carbon dioxide in the ISO medium. Carbon dioxide has been demonstrated to be essential for the growth of various anaerobic bacteria, notably homoacetogenic and methanogenic bacteria.
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Gartiser, S., Wallrabenstein, M. & Stiene, G. Assessment of Several Test Methods for the Determination of the Anaerobic Biodegradability of Polymers. Journal of Polymers and the Environment 6, 159–173 (1998). https://doi.org/10.1023/A:1021869530253
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DOI: https://doi.org/10.1023/A:1021869530253