| 两段式曝气对好氧颗粒污泥脱氮性能的影响 |
| 摘要点击 2110 全文点击 750 投稿时间：2017-03-23 修订日期：2017-05-06 |
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| 中文关键词 两段式曝气 好氧颗粒污泥 短程同步硝化反硝化 亚氮积累率 反硝化速率 |
| 英文关键词 two-stage aeration aerobic granular sludge shortcut simultaneous nitrification and denitrification nitrite accumulation rate denitrification rate |
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| 中文摘要 |
| 基于4个不同进水条件的小试实验探究，得出所接种好氧颗粒污泥表面异养菌在曝气初期阶段大量消耗碳源，对于NO2--N和NO3--N的反硝化效率较低.为此，实验在常温（20~23℃）条件下，在同一周期内先采用低曝气量曝气之后再用高曝气量曝气的两段式曝气方式运行好氧颗粒污泥SBR反应器，低曝气量时长分别取1、2、3 h这3个阶段分别运行，并运用扫描电镜（SEM）和荧光原位杂交技术（FISH）对颗粒污泥进行分析，结果表明AGS粒径增大，反硝化能力提升，NO2--N的反硝化速率（以LVSS计）在低曝气时长为2 h时升至最高，达9.66 mg·（g·h）-1.亚硝态氮积累率不断升高至77.84%，总氮去除率最高达70%.颗粒污泥内部孔隙增多，且细菌多以球菌、椭球状及杆菌为主，氨氧化菌（AOB）占总菌的比例由13.70%升至15.40%.因此，通过两段式曝气过程实现了短程同步硝化反硝化过程并具有较好的脱氮性能. |
| 英文摘要 |
| Four mini experiments were conducted at different conditions. The heterotrophic microorganisms on the aerobic granular sludge surface consumed organic compounds at the initial stage of aeration. The denitrification rate and the efficiency of NO2--N and NO3--N removal were relatively low. Therefore, under the normal temperature conditions (20-23℃), aerobic granular sludge sequencing batch reactor (SBR) was operated in the two-stage aeration mode(first in low aeration then in high aeration mode). The low aeration time were carried out at 1, 2 and 3 hours stages respectively, and the characteristics of the granular sludge and its effects on microorganisms were analyzed by scanning electron microscopy (SEM) and fluorescence in situ hybridization (FISH) technique. The results show that the increase in the aerobic granular sludge (AGS) particle size improved the denitrification capacity; the denitrification rate of NO2--N was the highest at low aeration mode with 2 h and reached 9.66 mg·(g·h)-1. The accumulation rate of nitrite increased to 77.84% and the total nitrogen removal rate to 70%. The bacterial count inside the granular sludge increased and they were mainly cocci, bacillus, and ellipsoidal bacteria. Moreover, the proportion of ammonia-oxidizing bacteria in total bacterial count increased from 13.70% to 15.40%. Therefore, the two-stage aeration process achieved shortened simultaneous nitrification and denitrification processes and showed a good denitrification performance. |
