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在固体碳源驱动的反扩散生物膜脱系统中减少氧化的评估
Yingrui Liu1, Feng Chen1, Yanying He1
1School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, PR China.
Water research X
|February 10, 2025
概括
使用聚烯酸 (PCL) 的固体碳驱动的脱系统显示出高去除. 然而,电子竞争可能会增加氧化 (N2O) 排放,影响废水处理效率.
科学领域:
- 环境微生物学 环境微生物学
- 环境化学环境化学
- 生物技术是生物技术.
背景情况:
- 生物膜系统中的固体碳来源提供了脱的潜力,但可以延迟碳-接触,影响电子运输,增加废水处理厂 (WWTP) 的氧化物 (N2O) 排放.
- 固态脱过程中N2O生产和消耗的具体动态仍然不太清楚,这阻碍了提取的优化过程.
研究的目的:
- 为了研究N2O动态和整体去除效率在一个固定床生物反应器中,用于固态脱.
- 阐明电子竞争对N2O排放和在不同氧化物度下转化的影响.
主要方法:
- 一个固定床生物反应器使用聚烯 (PCL) 作为固体碳源运行了180天.
- 进行生物化学分析以评估不同氧化 (NOx) 条件下的去除效率,N2O动态和微生物群体组成.
主要成果:
- 该PCL驱动系统实现了高总 (TN) 清除效率,达到97%-99%.
- 尽管碳供应足够,但观察到N2O减少酶 (Nos) 的电子竞争,限制了N2O减少 (12.6%的电子分布,1.42 mg/g VSS/h率).
- 处理混合氧化 (酸盐,酸盐,N2O) 导致TN去除率比单一酸盐处理高1.75-2.3倍,同时减少N2O排放.
结论:
- 用PCL驱动的生物膜脱有效地去除,但需要谨慎管理,以减轻由于电子竞争而导致的N2O排放.
- 该系统在处理复杂的废水时,证明了改进的TN去除和减少N2O副产品的形成.
- 微生物群落,特别是高丰度的细菌群和科,在稳定的碳释放和转化中起着至关重要的作用.
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