Enhancing anaerobic methane production in the co-presence of PLA, TPS, and PBAT mixed under hydrogen-rich conditions

IF 4.1 2区环境科学与生态学 Q2 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

International Biodeterioration & Biodegradation Pub Date : 2025-04-13 DOI:10.1016/j.ibiod.2025.106094

Eun Seo Lee , Seon Yeong Park , Chang Gyun Kim

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引用次数: 0

Abstract

Methane (CH₄) production was compared during mesophilic anaerobic digestion (AD) under H₂/CO₂ purged versus N₂ purged, investigating the biodecomposition of polylactic acid (PLA), thermoplastic starch (TPS), and polybutylene adipate terephthalate (PBAT) as the co-presence of PLA/TPS (LS), TPS/PBAT (SB), PLA/PBAT (LB), and PLA/TPS/PBAT (LSB). Therein, 427.37 and 339.22 mL CH₄/g volatile solid (VS) were produced endogenously under H₂/CO₂ and N₂ purged, respectively. CH₄ production from LS and SB was further increased from 170 to 193 mL CH₄/g VS compared to the respective control samples. The degradation of LB and LSB resulted in significantly higher CH₄ production under H₂/CO₂ (157.49 and 229.21 mL CH₄/g VS) than under N₂ (106.88 and 119.63 mL CH₄/g VS, respectively). Metagenome sequencing revealed that H₂/CO₂ purged led syntrophs of hydrogenotrophic methanogens (e.g., Firmicutes) overcoming higher strengths of fatty acids and utilizing H₂ to produce more CH₄. Subsequently, PLA and PBAT exhibited breakdowns in the polymer chains and molecular weight along with increased crystallinity. This was confirmed through Fourier transform infrared spectroscopy (FTIR), gel permeation chromatography (GPC), and differential scanning calorimetry (DSC). This study highlights the critical roles of co-digestion with H₂ and bioplastics in increasing CH₄ production in the AD system.

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在富氢条件下，PLA、TPS和PBAT混合共存提高厌氧甲烷产量

研究了在H2/CO2净化和N2净化条件下，聚乳酸（PLA）、热塑性淀粉（TPS）和聚己二酸丁二醇对苯二甲酸酯（PBAT）在PLA/TPS （LS）、TPS/PBAT （SB）、PLA/PBAT （LB）和PLA/TPS/PBAT （LSB）共存在下的生物分解。其中，在H2/CO2和N2净化下，内源产生的CH4含量分别为427.37和339.22 mL /g。与对照样品相比，LS和SB的CH4产量从170 mL /g VS进一步增加到193 mL /g VS。H2/CO2条件下LB和LSB的CH4产率（157.49和229.21 mL CH4/g VS）显著高于N2条件下（106.88和119.63 mL CH4/g VS）。宏基因组测序显示，H2/CO2净化导致氢营养产甲烷菌（如厚壁菌门）的合养菌克服了较高的脂肪酸强度，并利用H2产生更多的CH4。随后，PLA和PBAT的聚合物链和分子量随着结晶度的增加而发生断裂。通过傅里叶变换红外光谱（FTIR）、凝胶渗透色谱（GPC）和差示扫描量热法（DSC）证实了这一点。本研究强调了在AD系统中与H2和生物塑料共消化在增加CH4产量中的关键作用。

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来源期刊

International Biodeterioration & Biodegradation 生物-环境科学

CiteScore

9.60

自引率

10.40%

发文量

107

审稿时长

21 days

期刊介绍： International Biodeterioration and Biodegradation publishes original research papers and reviews on the biological causes of deterioration or degradation.