Promoting role of nitrogen-fixing bacteria and biochar on nitrogen retention and degradation of PBAT plastics during composting

Wang L 1 , Qi Y 2 , Cao L 3 , Song L 4 , Hu R 5 , Li Q 5 Show all authors , Zhao Y 4 , Liu J 6 , Zhang H 7

Affiliations 

  • 1 China-Malaysia National Joint Laboratory, Biomedical Research Center, Northwest Minzu University, Lanzhou, 730000, China; Key Laboratory of Environment-Friendly Composites of the State Ethnic Affairs Commission, Lanzhou, 730000, China
  • 2 China-Malaysia National Joint Laboratory, Biomedical Research Center, Northwest Minzu University, Lanzhou, 730000, China; Gansu Provincial Biomass Function Composites Engineering Research Center, Lanzhou, 730000, China. Electronic address: qiyj123@xbmu.edu.cn
  • 3 China-Malaysia National Joint Laboratory, Biomedical Research Center, Northwest Minzu University, Lanzhou, 730000, China
  • 4 Key Laboratory of Environment-Friendly Composites of the State Ethnic Affairs Commission, Lanzhou, 730000, China
  • 5 Gansu Provincial Biomass Function Composites Engineering Research Center, Lanzhou, 730000, China
  • 6 Gansu Jiyang Plastic Co., Ltd, Lanzhou, 730000, China
  • 7 Key Laboratory of Environment-Friendly Composites of the State Ethnic Affairs Commission, Lanzhou, 730000, China; Gansu Provincial Biomass Function Composites Engineering Research Center, Lanzhou, 730000, China. Electronic address: 171941425@xbmu.edu.cn
Environ Pollut, 2024 Dec 15;363(Pt 2):125228.
PMID: 39486677 DOI: 10.1016/j.envpol.2024.125228

Abstract

Since the increasing number of polybutylene adipate terephthalate (PBAT)-based plastics entering the environment, the search for sustainable treatment methods has become a primary focus of contemporary research. Composting offers a novel approach for managing biodegradable plastics. However, a significant challenge in the composting process is how to control nitrogen loss and enhance plastic degradation. In this context, the effect of various additives on nitrogen retention, PBAT plastics degradation, and microbial community dynamics during composting was investigated. The findings revealed that the addition of nitrogen-fixing bacteria Azotobacter vinelandii and biochar (AzBC) significantly improved nitrogen retention and accelerated PBAT rupture within 40 days of composting. Specifically, the PBAT degradation rate in the AzBC group reached 29.6%, which increased by 12.14% (P 

* Title and MeSH Headings from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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