| The biodegradability of polyhydroxybutyrate-valerate (PHBV) under aerobic simulated landfill conditions was estimated from the absolute value of weight change. PHBV is a microbially synthesized polyester. Depending on the soil conditions in which PHBV pellets were placed, weight change varied between 0% to 27% from dry weight loss. Biodegradability of plastic resin was influenced by soil microbial activity. Use of chicken manure as a soil medium caused the highest percentage of weight loss regardless of its moisture condition. Sterilized sand due to the lack of microbial activity generated the least degradation. Results of the experiments showed a positive correlation between microbial activity of soil and biodegradation of PHBV plastic resins. In the U.S, yard and food waste represent 28%, by volume of MSW. From the composition of MSW and results of this experiment, it could be postulated that PHBV be used as packaging materials without adverse effects on the environment and landfill. |
