Cited by 47Anaerobic Digestion and Biogas Productionbiodegradable polymer synthesis and propertiesMicroplastics and Plastic Pollution

Impact of the thermo-alkaline pretreatment on the anaerobic digestion of poly(butylene adipate-co-terephthalate) (PBAT) and poly(lactic acid) (PLA) blended plastics

Nie, Rong, Peng, Wei, Lü, Fan, Zhang, Hua, Lu, Xiangyu, He, Pinjing·2024·Journal of Hazardous Materials

Abstract

Poly(butylene adipate-co-terephthalate) (PBAT) is a biodegradable plastic that is difficult to degrade under both mesophilic and thermophilic anaerobic conditions. In this study, the impact of the thermo-alkaline pretreatment (48 h, 70 °C, 1 % w/v NaOH) on the anaerobic degradation (AD) of PBAT, poly(lactic acid) (PLA) and PBAT/PLA blended plastics was investigated. Under mesophilic conditions, pretreatment only improved the methane yield of PBAT/PLA/starch plastic (100 days, 51 and 34 NmL/g VS add for the treated and original plastics, respectively). Under thermophilic conditions, the pretreatment increased the methanogenic rate of PLA, PBAT and PBAT/PLA/starch plastic at the beginning stage (22 days, 35 and 79 NmL/g VS add for original and treated PBAT, respectively), but did not change the methane yield at the end of the incubation (100 days, 91 NmL/g VS add for original and treated PBAT). The reduction in the molecular weight and the formation of pore structures on the plastic surface accelerated the utilization of plastics by microorganisms. Furthermore, the pretreated plastics tend to form microplastics (MPs) with size predominantly below 500 µm (>90 %). The numbers of MPs dynamically changed with the degradation time. Several genera of bacteria showed specific degradation of biodegradable plastics under thermophilic conditions, including Desulfitibacter, Coprothermobacter, Tepidimicrobium, c_ D8A-2 and Thermacetogenium. The results suggest that more attention should be paid to the problem of MPs arising from the thermo-alkaline pretreatment.

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Authors
Nie, R., Peng, W., Lü, F., Zhang, H., Lu, X., & He, P.
Affiliations
Tongji University (CN)
Corresponding author
  • Peng, Wei
  • He, Pinjing
Venue
Journal of Hazardous Materials
Publisher
Elsevier BV
Published
2024-08
Volume
475
Pages
134882
ISSN
0304-3894 (ISSN-L)
OpenAlex
W4399534843
Cited by
47
References
57
Citations by year
2026: 23 · 2025: 20 · 2024: 4
FWCI
8.74
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Hazardous Materials (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Fundamental Research Funds for the Central Universities (22120220553, 2023-3-YB-11)
  • National Natural Science Foundation of China (52000144, 22276140)
Topics
  • Physical Sciences › Engineering › Building and Construction › Anaerobic Digestion and Biogas Production
  • Physical Sciences › Materials Science › Biomaterials › biodegradable polymer synthesis and properties
  • Physical Sciences › Environmental Science › Pollution › Microplastics and Plastic Pollution
Keywords
anaerobic digestion, poly(butylene adipate-co-terephthalate), polylactic acid, biodegradable plastics, polymer blends, methane yield, thermophilic digestion, mesophilic digestion, microplastics, plastic degradation, Coprothermobacter
MeSH terms
Anaerobiosis, Biodegradation, Environmental, Methane, Plastics, Polyesters, Sodium Hydroxide, Temperature

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