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生物膜在低溶氧条件下的侧流部分化系统中增加N₂O生产

Yanying He¹, Xianli Yang¹, Yingxin Jin¹

¹School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, PR China.

|December 3, 2025

概括

废水处理中的生物膜载体在低溶氧 (DO) 条件下显著增加氧化 (N2O) 排放. 减少DO或消除载体可以减轻这些温室气体排放,提高可持续性.

科学领域:

环境工程环境工程
废水处理技术废水处理技术
温室气体排放量温室气体排放量

背景情况:

传统的活性污泥 (CAS) 工艺是废水处理的标准.
集成固膜活性污泥 (IFAS) 提供了升级,但其对N2O排放的影响还未得到充分研究.
氧化 (N2O) 是一种强有力的温室气体,对废水处理厂的排放有很大贡献.

研究的目的:

进行部分化 (PN) 的CAS和IFAS反应器之间的N2O排放量进行比较.
研究生物膜载体在不同水平的溶氧 (DO) 下对N2O生产的影响.
了解IFAS系统中驱动N2O排放的微生物机制.

主要方法:

在受控部分化条件下对CAS和IFAS反应器进行比较研究.
测量N2O排放量和溶解氧 (DO) 水平.
微生物社区结构和功能的分析.
在IFAS反应堆中使用和不使用生物膜载体进行实验.

主要成果:

具有生物膜载体的IFAS反应堆排放的N2O比低DO (<0.5毫克O2/L) 的CAS反应堆多3.04倍.
N2O的产生与氧胺氧化和异性化脱有关,这是由生物膜中的无氧微环境所促进的.
移除生物膜载体将N2O排放因子从1.64%降低到0.63%,增加DO水平也减少了IFAS的N2O排放.

结论:

在IFAS系统中生物膜的存在在低DO条件下显著增加N2O排放.
优化DO水平和考虑生物膜载体设计对于最小化IFAS技术中的温室气体足迹至关重要.
这项研究为开发可持续的IFAS流程提供了洞察力,以实现高效的废水处理.

关键词:

无毒微环境是一种无毒的微环境.生物膜是一种生物膜.集成固膜活性污泥 (IFAS) 的使用.氧化 (N(2) O) 是一种氧化.部分化部分化网站偏好网站偏好

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