Microbial biofilm composition and polymer degradation of compostable and non-compostable plastics immersed in the marine environment

JOURNAL OF HAZARDOUS MATERIALS

卷:419

Article

Delacuvellerie, Alice¹  Benali, Samira²  Cyriaque, Valentine¹  Moins, Sebastien²  Raquez, Jean-Marie²  Gobert, Sylvie³  Wattiez, Ruddy¹ 

[1] Univ Mons, Prote & Microbiol Dept, 20 Pl Parc, B-7000 Mons, Belgium

[2] Univ Mons, Polymer & Composite Mat Dept, 15 Ave Maistriau, B-7000 Mons, Belgium

[3] Univ Liege, Oceanol Dept, 11 Allee 6 Aout, B-4000 Liege, Belgium

关键词: Plastisphere;    Enrichment culture;    Bacterial community;    Sequencing;    Mediterranean Sea;   

DOI  :  10.1016/j.jhazmat.2021.126526

来源: Elsevier

【 摘 要 】

Different plastic types considered as compostable are found on the market such as petro-based (e.g., polybutylene adipate terephthalate (PBAT)) or bio-based plastics (e.g., polylactic acid, (PLA)). Even if their degradation has been confirmed in industrial compost conditions, investigation of their degradation in natural marine environment has been limited. To better understand biodegradation into natural marine environment, commercial compostable (PBAT, semi-crystalline and amorphous PLA) and non-compostable polymers (low density polyethylene, polystyrene, polyethylene terephthalate, polyvinyl chloride) were submerged in situ on the sediment and in the water column in the Mediterranean Sea. These samples were studied by chemical and microbiological approaches. After 82 days of immersion, no significant bacterial degradation of the different polymers was observed, except some abiotic alterations of PBAT and LDPE probably due to a photooxidation process. However, after 80 days in an enrichment culture containing plastic films as a main carbon source, Marinomonas genus was specifically selected on the PBAT and a weight loss of 12% was highlighted. A better understanding of the bacterial community colonizing these plastics is essential for an eco-design of new biodegradable polymers to allow a rapid degradation in aquatic environment.

【 授权许可】

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