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National Repository of Grey Literature 2 records found  Search took 0.04 seconds. 
Biodegradation of polyesters and other polymers in soil and compost
 Papala, František ; Smilek, Jiří (referee) ; Obruča, Stanislav (advisor)
This diploma thesis studies the biodegradation of polyhydroxybutyrate (PHB) and polylactic acid (PLA) within soil and compost environments. The experimental part of this work is concerned with the differences in degradation across environments and the effects of degraded polymers on the environment itself. Experiments revealed that higher temperature and potentially also higher humidity substantially affect the rate of biodegradation. A significant degradation of all the polymers was observed in the compost medium, while polymers within the soil medium did not demonstrate any visible change nor change in mass after the 8th week of experiment. Even though SEM images revealed slow microbial degradation of soil PHB, this was not seen in any of the soil-incubated PLA samples. This might indicate primarily abiotic mechanism of PLA degradation. Germination and grow tests, which used the prepared polymer-enriched compost as a substrate and fertilizer, respectively, did not in most cases reveal any significant differences between individual plants across substrates. This seems to imply that neither the examined polymers nor their degradation products generated during composting are phytotoxic.
Detailed record
Biodegradation of polyesters and other polymers in soil and compost
 Papala, František ; Smilek, Jiří (referee) ; Obruča, Stanislav (advisor)
This diploma thesis studies the biodegradation of polyhydroxybutyrate (PHB) and polylactic acid (PLA) within soil and compost environments. The experimental part of this work is concerned with the differences in degradation across environments and the effects of degraded polymers on the environment itself. Experiments revealed that higher temperature and potentially also higher humidity substantially affect the rate of biodegradation. A significant degradation of all the polymers was observed in the compost medium, while polymers within the soil medium did not demonstrate any visible change nor change in mass after the 8th week of experiment. Even though SEM images revealed slow microbial degradation of soil PHB, this was not seen in any of the soil-incubated PLA samples. This might indicate primarily abiotic mechanism of PLA degradation. Germination and grow tests, which used the prepared polymer-enriched compost as a substrate and fertilizer, respectively, did not in most cases reveal any significant differences between individual plants across substrates. This seems to imply that neither the examined polymers nor their degradation products generated during composting are phytotoxic.
Detailed record

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