Resumo

CAMACHO-MUNOZ, RICARDO  e  HOYOS-CONCHA, JOSE LUIS. ANAEROBIC BIODEGRADATION OF A BIODEGRADABLE MATERIAL UNDER ANAEROBIC-THERMOPHILIC DIGESTION. Rev.Bio.Agro [online]. 2014, vol.12, n.2, pp.20-29. ISSN 1692-3561.

This paper dertermined the anaerobic biodegradation of a polymer obtained by extrusion process of native cassava starch, polylactic acid and polycaprolactone. Initially a thermophilic - methanogenic inoculum was prepared from urban solid waste. The gas final methane concentration and medium’spH reached values of59,6% and 7,89 respectively. The assay assembly was carried out according ASTM D5511 standard. The biodegradation percent of used materials after 15 day of digestion were: 77,49%, 61,27%, 0,31% for cellulose, sample and polyethylene respectively. Due cellulose showed biodegradation levels higher than 70% it’s deduced that the inoculum conditions were appropriate. A biodegradation level of 61,27%, 59,35% of methane concentration in sample’s evolved gas and a medium’s finale pH of 7,71 in sample’s vessels, reveal the extruded polymer´s capacity to be anaerobically degraded under thermophilic - high solid concentration conditions.

Palavras-chave : Starch; Polylactic acid; Polycaprolactone.

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