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A2/O与A2/O-MBR工艺污水厂CH4和N2O产-排特征及差异分析

尚振欣,  刘佳,  郭燕丽,  黄翔峰,  蔡辰

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文章导航 > 环境工程  > 2026 >  44(6): 126-137
尚振欣, 刘佳, 郭燕丽, 黄翔峰, 蔡辰. A2/O与A2/O-MBR工艺污水厂CH4和N2O产-排特征及差异分析[J]. 环境工程, 2026, 44(6): 126-137. doi: 10.13205/j.hjgc.202606013
引用本文: 尚振欣, 刘佳, 郭燕丽, 黄翔峰, 蔡辰. A2/O与A2/O-MBR工艺污水厂CH4和N2O产-排特征及差异分析[J]. 环境工程, 2026, 44(6): 126-137. doi: 10.13205/j.hjgc.202606013
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SHANG Zhenxin, LIU Jia, GUO Yanli, HUANG Xiangfeng, CAI Chen. Comparative analysis of CH4 and N2O generation and emission characteristics in A2/O and A2/O-MBR wastewater treatment plants[J]. ENVIRONMENTAL ENGINEERING , 2026, 44(6): 126-137. doi: 10.13205/j.hjgc.202606013
Citation: SHANG Zhenxin, LIU Jia, GUO Yanli, HUANG Xiangfeng, CAI Chen. Comparative analysis of CH4 and N2O generation and emission characteristics in A2/O and A2/O-MBR wastewater treatment plants[J]. ENVIRONMENTAL ENGINEERING , 2026, 44(6): 126-137. doi: 10.13205/j.hjgc.202606013
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A2/O与A2/O-MBR工艺污水厂CH4和N2O产-排特征及差异分析

doi: 10.13205/j.hjgc.202606013

  • 1. 同济大学 环境科学与工程学院, 上海 200092;

  • 2. 同济大学 碳中和研究院, 上海 200092

基金项目: 

上海市教育委员会人工智能促进科研范式改革赋能学科跃升计划（04002360525）

详细信息
    作者简介:

    尚振欣(1995-),男,博士,主要研究方向为污水处理行业碳排放核算与监测,基于数据驱动的碳减排智能优化。zhenxinshang@gmail.com

    通讯作者:

    蔡辰(1988-),男,副教授,主要研究方向为碳中和理论与技术。caic@tongji.edu.cn

Comparative analysis of CH4 and N2O generation and emission characteristics in A2/O and A2/O-MBR wastewater treatment plants

  • 1. College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China;

  • 2. Institute of Carbon Neutrality, Tongji University, Shanghai 200092, China

    摘要
  • 摘要: A2/O-MBR工艺因其出水水质优异和占地面积小等优势，正逐步成为污水处理厂新建与改扩建的主流技术之一。然而，该工艺的温室气体产排研究仍存在空白，且缺乏与传统A2/O工艺的比较研究数据。在相同进水、气候和排放标准条件下，对2座全规模A2/O和A2/O-MBR工艺污水厂开展高频连续监测，结合溶解态CH4与N2O浓度、水质及运行参数，解析了2种工艺的产-排特征差异。结果表明：2座水厂的日均CH4排放强度无显著差异，分别为（0.67 ± 0.22），（0.65 ± 0.18）g/m3，污水管网厌氧生成的CH4在预处理单元的逸散是主要排放源（占总排放量70%以上）。高温与曝气吹脱是促进CH4逸散排放的关键因素。A2/O-MBR工艺的日均N2O排放强度［（0.132 ± 0.055） g/m3］显著高于A2/O工艺［（0.060 ± 0.046） g/m3］。膜池的高比例携氧回流及持续高强度曝气吹脱，显著增强了N2O的生成与逸散排放。A2/O工艺的N2O排放以碳源驱动的异养反硝化为主，而A2/O-MBR工艺主要受NH3-N负荷及好氧区DO驱动，以硝化型途径为主。2种工艺CH4与N2O排放因子均显著低于IPCC与行业指南推荐值，强调了排放因子本地化的重要性。研究填补了A2/O-MBR工艺温室气体产-排特征的研究空白，揭示了A2/O与A2/O-MBR工艺的产-排差异机制，并为建立温室气体排放清单提供了关键数据支撑，为制定针对性减排措施提供了科学依据，其结果可用于城市污水厂提标改造和新建项目的低碳工艺优选与规划。
    Abstract: The A2/O-MBR process， owing to its superior effluent quality and smaller footprint， is increasingly adopted in newly built and upgraded wastewater treatment plants. However， systematic studies on its greenhouse gas （GHG） emissions remain scarce， and direct comparisons with the conventional A2/O process are lacking. In this study， two full-scale wastewater treatment plants employing the A2/O and A2/O-MBR processes under identical influent conditions， climate， and discharge standards were investigated. A high-frequency monitoring system covering the entire treatment train was established， and combined with measurements of dissolved CH4 and N2O， water quality parameters， and operational parameters， to elucidate the differences in GHG emission characteristics. Results showed that the daily average CH4 emission intensities were not significantly different between the two plants ［（0.67 ± 0.22），（0.65 ± 0.18） g/m3， respectively］. CH4 emissions mainly originated from sewer-derived anaerobic production and subsequent release in the pretreatment units （accounting for over 70% of the total emissions）， with partial in-plant oxidation by methanotrophs. Temperature and aeration-induced stripping were identified as key driving factors， as CH4 emissions were positively correlated with ambient temperature and dissolved oxygen （DO）. In contrast， more than 90% of N2O emissions occurred in the biological treatment units. The A2/O-MBR plant exhibited significantly higher daily N2O emission intensity ［（0.132 ± 0.055） g/m3］ than the A2/O plant ［（0.060 ± 0.046） g/m3］， largely due to intensive aeration and oxygen-enriched internal/external recirculation in the membrane tank， which enhanced N2O production and stripping. Correlation analysis further revealed that N2O emissions in the A2/O plant were positively related to influent COD and BOD5， indicating dominance of heterotrophic denitrification， whereas in the A2/O-MBR process they were mainly driven by NH3-N loading and DO， reflecting a nitrification-based pathway. Importantly， both processes exhibited CH4 and N2O emission factors that were significantly lower than the reference values recommended by the IPCC and industry guidelines， underscoring the necessity of developing localized emission factors. This study fills a critical research gap concerning the greenhouse-gas generation and emission characteristics of the A2/O-MBR process， reveals the mechanistic differences between A2/O and A2/O-MBR process， and provides essential data to support greenhouse-gas emission inventories. The findings offer a scientific basis for targeted mitigation measures and can guide low-carbon process selection and planning for both upgrading existing urban wastewater treatment plants and designing new facilities.
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  • 收稿日期:  2025-08-06
  • 录用日期:  2025-09-20
  • 修回日期:  2025-09-10
  • 网络出版日期:  2026-07-06

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