期刊
CHEMOSPHERE
卷 191, 期 -, 页码 979-989出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2017.10.117
关键词
Plastic wastes; Polystyrene; Biodegradation; Mealworms; Tenebrio molitor
资金
- Woods Institute for Environment at Stanford University [1197667-10-WTAZB]
- US National Science Foundation SBIR award [1648559]
- Harbin Institute of Technology (HIT), Harbin, China
Commercial production of polystyrene (PS)-a persistent plastic that is not biodegradable at appreciable rates in most environments-has led to its accumulation as a major contaminant of land, rivers, lakes, and oceans. Recently, however, an environment was identified in which PS is susceptible to rapid biodegradation: the larval gut of Tenebrio molitor Linnaeus (yellow mealworms). In this study, we evaluate PS degradation capabilities of a previously untested strain of T. molitor and assess its survival and PS biodegradation rates for a range of conditions (two simulated food wastes, three temperatures, seven PS waste types). For larvae fed PS alone, the %PS removed in the short (12-15 h) residence time of the mealworm gut gradually increased for 2-3 weeks then stabilized at values up to 65%. Thirty two-day survival rates were >85% versus 54% for unfed larvae. For mealworms fed similar to 10% w/w PS and similar to 90% bran, an agricultural byproduct, rates of PS degradation at 25 degrees C nearly doubled compared to mealworms fed PS alone. Polymer residues in the frass showed evidence of partial depolymerization and oxidation. All of the tested PS wastes degraded, with the less dense foams degrading most rapidly. Mealworms fed bran and PS completed all life cycle stages (larvae, pupae, beetles, egg), and the second generation had favorable PS degradation, opening the door for selective breeding. (C) 2017 Elsevier Ltd. All rights reserved.
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