| 间歇曝气下短程硝化耦合污泥微膨胀稳定性 |
| 摘要点击 2187 全文点击 581 投稿时间：2017-11-28 修订日期：2017-12-27 |
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| 中文关键词 低溶解氧 污泥微膨胀 亚硝酸盐积累率 污泥体积指数 总氮去除率 间歇曝气 |
| 英文关键词 low dissolved oxygen limited filamentous bulking nitrite accumulation ratio sludge volume index TN removal rate intermittent aeration |
| 作者 | 单位 | E-mail | | 高春娣 | 北京工业大学环境与能源工程学院, 城镇污水深度处理与资源化利用技术国家工程实验室, 北京 100124 | gaochundi@bjut.edu.cn | | 孙大阳 | 北京工业大学环境与能源工程学院, 城镇污水深度处理与资源化利用技术国家工程实验室, 北京 100124 | | | 安冉 | 北京工业大学环境与能源工程学院, 城镇污水深度处理与资源化利用技术国家工程实验室, 北京 100124 | | | 赵楠 | 北京工业大学环境与能源工程学院, 城镇污水深度处理与资源化利用技术国家工程实验室, 北京 100124 | | | 焦二龙 | 北京排水集团, 北京 100037 | | | 祝海兵 | 北京工业大学环境与能源工程学院, 城镇污水深度处理与资源化利用技术国家工程实验室, 北京 100124 | |
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| 中文摘要 |
| 污泥微膨胀耦合短程硝化是一种利用低溶解氧（DO）引发丝状菌有限繁殖和亚硝酸盐（NO2--N）积累来协同提高氮的去除率并降低能耗的新工艺.为分析该工艺启动的可行性和长期稳定性，采用两个间歇式反应器（SBR）并通过调整曝气方式，考察低DO（0.3~0.8 mg·L-1）下污泥沉降性、亚硝酸盐累积率（NAR）、总氮的去除特性、优势丝状菌和硝化菌群的动态变化.结果表明，缺氧∶好氧=15 min ∶30 min的间歇曝气运行方式下，可以实现NAR约为50%和稳定的污泥微膨胀，污泥体积指数（SVI）稳定在170~200 mL·g-1.实时连续曝气可以实现NAR为95%以上，并且NO2--N的累积引发了以Type 0092型为优势丝状菌的污泥微膨胀，但无法长期维持.改变运行方式为间歇曝气，运行60 d左右可以实现短程硝化和微膨胀耦合及长期稳定维持，TN的去除率稳定在66%.FISH分析间歇曝气引发污泥微膨胀主要丝状菌是M.parvicella和Type 0092型.Q-PCR对硝化菌群定量分析得出SBR A初期和末期AOB占全菌的比例分别由0.53%提高到2.19%，NOB由17.5%降至3.2%.SBR B里AOB由0.51%提高到1.53%，而NOB由18.05%降至11.01%. |
| 英文摘要 |
| Limited filamentous bulking (LFB) combined with nitritation under low dissolved oxygen (DO) is a new technology for enhancing nitrogen removal and reducing aeration requirements. In order to investigate the feasibility and sustainability of this technology, two sequence batch reactors (SBRs) were operated under different regimes to stimulate different aeration modes under low DO (0.3-0.8 mg·L-1). Sludge settleability, nitrite accumulation ratio (NAR), total nitrogen (TN) removal rate, dynamic variation of dominant filaments, and nitrifying bacterial communities were investigated. The results indicated that short-cut nitrification combined with LFB could be achieved under intermittent aeration, and the ratio of anoxic/aerobic was 15 min/30 min, the value of sludge volume index (SVI) was maintained from 170 mL·g-1 to 200 mL·g-1. An NAR above 95% was achieved under real-time continuous aeration. Meanwhile, LFB was induced when nitrite started to accumulate, and the dominant filament was Type 0092. However, the limited bulking was not maintained for the long term. After a transfer from continuous aeration to intermittent aeration, LFB reappeared in 60 days and the value of SVI remained between 170 mL·g-1 and 200 mL·g-1. The process of nitritation combined with LFB was maintained stably for the next two months, and the TN removal rate was above 66%. FISH analysis indicated that the identical dominant filaments were M. parvicella and Type 0092 for maintaining limited bulking in the two reactors. qPCR results showed that proportion of AOB in the total bacteria increased from the previous 0.53% to 2.19% in the end, whereas that of NOB decreased from 17.5% to 3.2% in SBR A. Moreover, the proportion of AOB increased from 0.51% to 1.53%, whereas that of NOB decreased from 18.05% to 11.01% in SBR B. |
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