生物地质化学控制木材退化作为生物可利用碳的来源在无化生物反应器中的生物可利用碳
Yi Sang1, Iva Petrovic1, Lily Elaine DuPlooy1
1School of Civil and Environmental Engineering, Cornell University, Ithaca, New York 14853, United States.
Environmental science & technology
|June 3, 2025
概括
木片生物反应器有效地去除酸盐,但木材的缓慢分解限制了性能. 溶解的氧气,铁和加快了木材的分解,增强了这些系统中酸盐的去除.
科学领域:
- 环境科学环境科学
- 生物地质化学生物地质化学
- 微生物学 微生物学
背景情况:
- 木片生物反应器 (WBR) 对农业中酸盐的去除至关重要.
- 在WBR中缓慢降解纤维素素纤维素降解限制了生物可利用的碳用于无化微生物.
- 了解木材分解是优化WBR效率的关键.
研究的目的:
- 调查控制和WBR中木材降解的生物地化学因素.
- 检查溶解氧 (DO),铁 (Fe) 和 (Mn) 在木材分解中的作用.
- 将木材降解与酸盐去除率相关联.
主要方法:
- 使用批量技术和微型X射线散射,X射线光 (μXRF) 和边缘结构附近的X射线吸收 (μXANES) 来表征老化的木片.
- 视觉化晶体纤维素耗尽作为木材退化指标.
- 在木表面层中分析了Fe和Mn的分化.
主要成果:
- 木材退化在上游WBR段中最大,与较高的DO暴露有关.
- 降解发生在富含Fe和Mn的100-200微米表面层中.
- 增加木材降解与提高酸盐去除率相关.
- 微尺度分析揭示了Fe和Mn的氧化反应,这些反应有助于林氏纤维素的分解.
结论:
- DO,Fe和Mn在加速WBR中木材分解方面发挥着关键作用.
- 涉及Fe和Mn的微生物氧化过程增强了林氏纤维素的降解.
- 优化这些生物地质化学因素可以提高WBR在酸盐去除方面的性能.
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