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Biodegradability of Untreated and Microwave Treated Low Density PolyethyleneTotally Degradable Plastic Additives (LDPE-TDPA): A Preliminary Result
- Locally available biodegradable plastic LDPE–TDPA is an alternative solution to the problem of plastic packaging waste and litter. The synergistic effect on LDPE–TDPA under microwave treatment were considered in this study in order to speed up its biodegradation. Heating thru microwave irradiation initially degraded the plastic first into molecular fragments. The resulting fragments eventually became readily accessible to biodegradation by the microorganisms in liquid medium under anaerobic condition and microbial resistance in solid agar nutrient using activated sludge withdrawn from wastewater treatment plant as inoculum. Biodegradability assessment by biodegradation tests – closed bottle test in liquid anaerobic nutrient solution and petri dish screen test (polymer microbial resistance test) – are used to attribute the extent of biodegradation of untreated plastics and microwave–induced plastics. The biodegradability of untreated LDPE–TDPA and microwave induced LDPE– TDPA were compared. Results showed higher bioassimilation of microwave irradiated LDPE–TDPA after two weeks in liquid anaerobic condition, while original LDPE–TDPA did not show any significant bioassimilation. Based on the rating of ISO 846 both original and microwave irradiated LDPE-TDPA plastic polymers are rated 3 meaning no resistance microbial attacks containing nutritive substances is feasible. Microbial colonization was found in petri dish screen test in solid anaerobic condition after two weeks for both plastic films.
Soe Soe Than
Bacani, Florinda T.
Roces, Susan A.