| 引用本文: | 李晓琳,李晓良,茹秋瑾,等.膜曝气生物膜工艺处理低碳氮比农村生活污水的研究[J].灌溉排水学报,2026,45(3):102-110. |
| LI Xiaolin,LI Xiaoliang,RU Qiujin,et al.膜曝气生物膜工艺处理低碳氮比农村生活污水的研究[J].灌溉排水学报,2026,45(3):102-110. |
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| 摘要: |
| 【目的】评价膜曝气生物膜反应器（MABR）对农村低碳氮比生活污水的处理效果。【方法】采用柔性平板透氧膜材料和活性污泥进行耦合，设计出一体化MABR反应器处理模拟农村生活污水，通过改变进水碳氮比（COD/TN），研究MABR反应器对不同COD/TN农村生活污水的处理效果及MABR反应器内同步硝化反硝化率（SND），同时研究不同进水COD/TN对MABR反应器生物膜内部溶解氧质量浓度（DO）和pH值变化的影响。评价指标包括COD、TN、NH4+-N、NO3--N、NO2--N、总磷（TP）、活性污泥混合液悬浮固体（MLSS）质量浓度、混合液挥发性悬浮固体（MLVSS）质量浓度和SND等9个指标。【结果】随着进水COD/TN的升高，COD、TP、TN的去除率均逐步升高，当COD/TN=3时，MABR反应器对TN、TP的去除率和SND的发生率分别为72.01%±0.33%、50.29%±0.17%和83.16%±0.25%，且当COD/TN=3时生物膜的厚度最厚为425 μm，但当COD/TN=2时，MABR反应器对COD的去除率最高为92.77%±0.17%。在不同碳氮比条件下生物膜内部均出现了DO质量浓度和pH值的梯度分布，这为MABR生物膜内部功能分层提供了有利条件。【结论】MABR污水处理工艺对低碳氮比农村生活污水处理具有较好的处理效果，出水中COD、TN和TP均能满足DB61中的排放要求。鉴于MABR工艺的显著优势，该技术在农村生活污水处理领域具有推广应用价值。 |
| 关键词: 低碳氮比；农村生活污水；生物膜反应器；硝化反硝化 |
| DOI：10.13522/j.cnki.ggps.2025208 |
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| Performance of membrane aerated biofilm reactor (MABR) for treating rural domestic wastewater with low C/N ratio |
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LI Xiaolin, LI Xiaoliang, RU Qiujin, LUO Yanyu, QI Mingxing, WANG Yifan
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1. College of Water Resources Engineering, Shaanxi A&F Technology University, Yangling 710048, China;
2. School of Water Resources Hydro-electric Engineering, State Key Laboratory of Water Engineering Ecology and
Environment in Arid Area, Xi’an University of Technology, Xi’an 710048, China;
3. Power China Northwest Engineering Corporation Limited, Xi’an 710065, China
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| Abstract: |
| 【Objective】Rural domestic wastewater is typically characterized by low carbon-nitrogen (C/N) ratio, which limits denitrification efficiency in conventional biological treatment processes. This paper evaluates the performance of a membrane-aerated biofilm reactor (MABR) for treating rural domestic wastewater with low C/N ratio.【Method】An integrated MABR system was constructed by combining flexible flat-sheet oxygen-permeable membranes with activated sludge to treat artificial rural domestic wastewater with varying C/N ratios (expressed as ratios of chemical oxygen demand, COD, to total nitrogen, TN) to investigate their influence on treatment efficiency and nitrification and denitrification (SND). During the experiment, we measured the changes in dissolved oxygen concentration (DOC) and pH variations across the biofilm. The effect of C/N ratios was evaluated using indicators COD, total nitrogen (TN), ammonium nitrogen (NH4+-N), nitrate nitrogen (NO3--N), nitrite nitrogen (NO2--N), total phosphorus (TP), mixed liquor suspended solids (MLSS), mixed liquor volatile suspended solids (MLVSS), and SND.【Result】Increasing the COD/TN ratio in the influent led to gradual improvements in the removal efficiencies of COD, TN and TP. When the COD/TN ratio in the influent was 3, the removal efficiencies of TN and TP were 72.01% ± 0.33% and 50.29% ± 0.17%, respectively, with an SND occurrence rate of 83.16% ± 0.25%. Under this COD/TN ratio, the biofilm reached its maximum thickness of 425 μm. In contrast, when the COD/TN ratio was 2, the removal efficiency of COD was 92.77% ± 0.17%. We found distinct differences in DO and pH gradients across the biofilm under different COD/TN ratios, which facilitated functional stratification and enhanced SND performance in the MABR system.【Conclusion】The MABR system is effective for treating rural domestic wastewater with low C/N ratios. The COD, TN and TP concentrations in the effluent meet the requirements of the DB61 standards. Its high nitrogen removal efficiency and suitability for low C/N ratio influent underscore its potential for scale-up and practical application in rural wastewater treatment systems. |
| Key words: low carbon-to-nitrogen ratio; rural domestic wastewater; membrane aerated biofilm reactor (mabr); simultaneous nitrification and denitrification (SND) |
