净水技术2025，Vol.44Issue(7)：23-31,138,10.DOI:10.15890/j.cnki.jsjs.2025.07.003
基于微电极技术的生物脱氮污泥聚集体内N2O原位生成机制研究进展
Development of In-Situ Generation Mechanism of N2O by Bio-Denitrification in Sludge Aggregates Based on Microelectrodes
摘要
Abstract
[Objective]Nitrous oxide(N2O),a potent greenhouse gas,contributes over 80％of the carbon footprint in wastewater treatment systems.Accurately analyzing its generation mechanism is critical for optimizing treatment processes and reducing carbon emissions.[Methods]Using microelectrode technology,this paper systematically reviewes the in situ monitoring of N2O within sludge aggregates and quantifies the regulation of N2O generation by dissolved oxygen gradients through a coupled diffusion-reaction model.The study encompasses traditional nitrification-denitrification processes and novel short-cut nitrogen removal systems(e.g.,anaerobic ammonium oxidation).[Results]In traditional nitrification-denitrification systems,N2O release exhibite significant spatial heterogeneity within sludge aggregates.The N2O emission factor in aerobic zone reaches 2.1％,of which 53.6％is contributed by aeration stripping.During denitrification,low carbon/nitrogen ratios(C/N＜3)and low pH value(＜6.5)increases N2O yields to 2.7 times and 65.0％of baseline values,respectively,due to electron donor competition and nitrous oxide reductase(NOS)inhibition.In anaerobic ammonium oxidation granules,N2O production hotspots(600～1 300 pan)showes limited correlation with anaerobic ammonium oxidation bacterial activity,while ammonia-oxidizing bacteria denitrification contributes 68％±5％of total N2O.Optimizing oxygen mass transfer via the diffusion-reaction model[e.g.,membrane aeration biofilm reactor(MABR)]reduces the N2O emission factor to 0.005 8％.[Conclusion]Microelectrode technology elucidates microscale N2O generation mechanisms.Future efforts should focus on developing multi-parameter microelectrode arrays integrated with microbiomics and computational fluid dynamics(CFD)simulations to enable cross-scale analysis of"mass transfer-reaction-microbial community"interactions,advancing decarbonized and precision-controlled wastewater treatment.关键词
微电极/氧化亚氮(N2O)/生物脱氮/原位生物活性/扩散传质Key words
microelectrode/nitrous oxide(N2O)/bio-denitrification/in-situ bio-activity/diffusion and transfer分类
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孔海霞..基于微电极技术的生物脱氮污泥聚集体内N2O原位生成机制研究进展[J].净水技术,2025,44(7):23-31,138,10.基金项目
陕西省重点产业链项目(2022ZDLSF06-05) （2022ZDLSF06-05）
