Case study: enhancing methane production and polylactic acid decomposition in mesophilic anaerobic digestion system with hydrogen enrichment

IF 2.7 4区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Material Cycles and Waste Management Pub Date : 2024-07-18 DOI:10.1007/s10163-024-02033-2

Eun Seo Lee, Seon Yeong Park, Chang Gyun Kim

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Abstract

Anaerobic digestion under hydrogen (H₂)/carbon dioxide (CO₂)-versus nitrogen (N₂)-purged conditions was examined for the potential for biogas enhancement in the presence of polylactic acid. With or without polylactic acid, H₂/CO₂ purging demonstrated a 25% higher methane (CH₄) production, reaching approximately 160 NmL CH₄/g VS_add compared to N₂ purging. When H₂/CO₂ was purged with polylactic acid, there was reduced dominance of Spirochaetales, resulting in fewer intermediates that caused a similar amount of CH₄ yield. Despite similar CH₄ yield to conditions without polylactic acid, verification through Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and scanning electron microscopy (SEM) confirmed extensive polylactic acid decomposition. DSC revealed double melting peaks at 151.8 °C and 156.1 °C, indicating increased crystallinity and vigorous polylactic acid decomposition, particularly in the amorphous region, under H₂/CO₂ purging. This aligned with the decrease in the FTIR carbonyl index, visually confirmed using SEM. Metagenome sequencing highlighted the prevalence of hydrogenotrophic methanogens, Anaerolineales, Bacteroidales, and Thermoanaerobacterales under H₂/CO₂ purging, demonstrating higher polylactic acid degradation compared to N₂ purging conditions. This study revealed a potential for biogas upgrading with waste management of polylactic acid.

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案例研究：利用氢气富集技术提高中温厌氧消化系统的甲烷产量和聚乳酸分解能力

在氢气（H2）/二氧化碳（CO2）净化与氮气（N2）净化条件下进行厌氧消化，研究了在有聚乳酸存在的情况下提高沼气产量的潜力。无论有无聚乳酸，H2/CO2 吹扫比 N2 吹扫的甲烷（CH4）产量高 25%，达到约 160 NmL CH4/g VSadd。当用聚乳酸净化 H2/CO2 时，螺旋藻的优势减少，导致产生类似数量 CH4 的中间产物减少。尽管 CH4 产率与不含聚乳酸的条件相似，但通过傅立叶变换红外光谱（FTIR）、差示扫描量热仪（DSC）和扫描电子显微镜（SEM）的验证，证实了聚乳酸的大量分解。DSC 在 151.8 ℃ 和 156.1 ℃ 出现双熔峰，表明在 H2/CO2 吹扫条件下结晶度增加，聚乳酸分解剧烈，尤其是在无定形区。这与傅立叶变换红外光谱（FTIR）羰基指数的下降相吻合，并通过扫描电子显微镜（SEM）进行了直观确认。元基因组测序突出显示了在 H2/CO2 净化条件下养氢型甲烷菌、Anaerolineales、Bacteroidales 和 Thermoanaerobacterales 的普遍存在，表明与 N2 净化条件相比，聚乳酸降解率更高。这项研究揭示了聚乳酸废物管理的沼气升级潜力。

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来源期刊

Journal of Material Cycles and Waste Management 环境科学-环境科学

CiteScore

5.30

自引率

16.10%

发文量

205

审稿时长

4.8 months

期刊介绍： The Journal of Material Cycles and Waste Management has a twofold focus: research in technical, political, and environmental problems of material cycles and waste management; and information that contributes to the development of an interdisciplinary science of material cycles and waste management. Its aim is to develop solutions and prescriptions for material cycles. The journal publishes original articles, reviews, and invited papers from a wide range of disciplines related to material cycles and waste management. The journal is published in cooperation with the Japan Society of Material Cycles and Waste Management (JSMCWM) and the Korea Society of Waste Management (KSWM).