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Updated: May 24, 2026
10:22
Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
Published on: November 30, 2020
Lignin depolymerization as a source of polycyclic aromatic hydrocarbons in agricultural waste composting
Fengting Qu1, Yuran Yang2, Mengxue Fan2
1Tianjin Key Laboratory of Animal and Plant Resistance, College of Life Sciences, Tianjin Normal University, Tianjin 300387, China; College of Life Sciences, Northeast Agricultural University, Harbin 150030, China.
Bioresource Technology
|May 22, 2026
Summary
Microbial lignin depolymerization in composting can form polycyclic aromatic hydrocarbons (PAHs). This study confirms lignin
Area of Science:
- Environmental Science
- Biochemistry
- Soil Science
Background:
- Composting agricultural waste is crucial for sustainability.
- Polycyclic Aromatic Hydrocarbons (PAHs) are environmental pollutants.
- Lignin's role in PAH formation during composting is not fully understood.
Purpose of the Study:
- To investigate the contribution of lignin microbial depolymerization to PAH formation in composting.
- To analyze the correlation between lignin degradation patterns and PAH profiles in different feedstocks.
- To provide structural evidence for lignin as a source of PAHs.
Main Methods:
- Analysis of aerobic composts using Fourier-Transform Infrared Spectroscopy (FTIR).
- Two-Dimensional Correlation Spectroscopy (2D-COS) to analyze functional group transformations.
- Carbon-13 Nuclear Magnetic Resonance (13C NMR) and High-Performance Liquid Chromatography (HPLC) for structural and compositional analysis.
Main Results:
- Lignin content decreased in all compost systems, with distinct degradation pathways observed.
- PAH profiles varied significantly based on feedstock, with specific PAHs identified in straw and lawn waste composts.
- 13C NMR confirmed the formation of fused aromatic ring structures during lignin depolymerization, linking lignin to PAH formation.
Conclusions:
- Microbial depolymerization of lignin is a significant source of PAHs in composting systems.
- Feedstock type influences lignin degradation pathways and subsequent PAH formation.
- Understanding these molecular correlations is vital for safe agricultural waste management and risk mitigation.
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