Abstract
Anaerobic biodegradation tests of poly(lactic acid) (PLA) powder were done at the thermophilic (55 °C) and mesophilic temperature (35 °C) under aquatic conditions [total solid concentrations of the used sludge were 2.07% (at 55 °C) and 2.24% (at 35 °C)] using a newly developed evaluation system. With this system, the evolved biogas is collected in a gas sampling bag at atmospheric pressure. This method is more convenient than using a pressure transducer or inverted graduated cylinder submerged in water. PLA was degraded about 60% in 30 days, about 80% in 40 days and about 90% in 60 days at 55 °C. On the other hand, the PLA degradation started in 55 days at 35 °C and degradation rate was much slower than at 55 °C.
Highlights
Anaerobic fermentation has some advantages when compared to aerobic fermentation, such as composting
We describe the new evaluating system MODA-B apparatus and the results of the anaerobic biodegradation of poly(lactic acid) (PLA) as generally using bioplastics by the MODA-B apparatus at a thermophilic temperature (55 C) and mesophilic temperature (35 C) under aquatic conditions in which the TS were 2.07% and 2.24% in the anaerobic sludge
When the gas evolution decreased during the preincubation at 35 C, the upper solution part of the sludge was used as the inoculum for the anaerobic biodegradation test of PLA at 35 C
Summary
Anaerobic fermentation has some advantages when compared to aerobic fermentation, such as composting. The anaerobic fermentation plant is a nearly closed system compared to the more stenchful aerobic one with a shorter processing time, and produces CH4 as an energy source [9,10,11]. 2009, 10 anaerobic fermentation plants, the non-biodegradable garbage collection bags are currently separated from feed stocks of anaerobic fermentation. Sci. 2009, 10 anaerobic fermentation plants, the non-biodegradable garbage collection bags are currently separated from feed stocks of anaerobic fermentation The product, such as a garbage collection bag, made with biodegradable plastics and its waste is thought to be anaerobically degraded with household organic waste or animal manure in anaerobic fermentation plant. To verify whether biodegradable plastics are degraded in an anaerobic fermentation plant, their biodegradability must be measured in a laboratory, preferably by standard test methods
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