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从全尺寸混合膜气化生物膜反应器 (MABR) 中模拟氧化排放

Narasimman Lakshminarasimman¹, Mirzaman Zamanzadeh², Oliver Schraa²

¹Department of Civil and Environmental Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada.

|January 18, 2025

概括

这项研究改善了膜气化生物膜反应器 (MABR) 的氧化 (N2O) 排放模型. 改进的模型准确地预测N2O通路和排放,显示MABRs可以减轻N2O释放与传统系统相比.

科学领域:

环境工程环境工程
生物技术是生物技术.
化学工程是化学工程的重要组成部分.

背景情况:

膜气化生物膜反应堆 (MABR) 现有的二氧化 (N2O) 排放模型对于大规模应用缺乏准确性.
像N2O反扩散和气体循环这样的关键现象在当前模型中经常被简化或省略.

研究的目的:

为MABRs开发和验证一个改进的N2O排放模型,以考虑关键的被忽视的过程.
了解MABR生物膜和气相中的N2O生物转化途径.
为了估计一个完整的MABR系统的N2O排放因子.

主要方法:

开发了一种精细的数学模型,包括N2O反向扩散和光气体循环.
模型的验证使用从一个全尺寸的混合MABR设施测量N2O度.
利用验证的模型分析生物膜内的N2O生成和消耗途径.

主要成果:

模型预测确定了内部生物膜层作为氧化过程中的N2O生成热点.
在外部生物膜层中,N2O通过异构性脱而减少.
再循环气体中高达70%的N2O在混合液中被擦拭和脱.
估计N2O排放率为0.18 ± 0.01%的N2ON/N负载.

结论:

改进的MABR模型准确地代表了全尺寸系统中的N2O动态.
MABRs显示出减轻N2O排放的巨大潜力,估计比率远低于传统方法.
该研究强调了考虑复杂现象对于准确评估MABR中的N2O排放的重要性.

关键词:

生物膜是一种生物膜.这就是MABR的意义.膜扩散是膜扩散的一种方式.排放量为N(2) O的排放量

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