| 污泥龄对除磷亚硝化颗粒系统的影响 |
| 摘要点击 1308 全文点击 468 投稿时间：2019-05-13 修订日期：2019-06-13 |
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| 中文关键词 除磷亚硝化颗粒污泥 污泥龄 亚硝化积累率 比耗氧速率 溶解氧 |
| 英文关键词 phosphorus removal and nitrosation granules solid retention time(SRT) nitrite accumulation rate specific oxygen uptake rate dissolved oxygen |
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| 中文摘要 |
| 以低C/N比生活污水为研究对象，接种成熟除磷颗粒污泥，探究泥龄对中低温度下（14~21℃）除磷亚硝化颗粒污泥的影响.结果表明，常温下（20℃±1℃），泥龄为30 d，曝气量为5 L·（h·L）-1可实现除磷颗粒污泥中AOB的富集，NAR达到90%以上.当温度降低到15℃，泥龄为40 d时除磷性能恶化，颗粒结构变松散并伴有丝状菌生成.相对充足的氧气使亚硝化失稳，NAR下降至22.4%.NOB不具备迅速适应环境变化的能力，采取12 d厌氧饥饿加排泥的策略，削弱了NOB的相对活性，迅速恢复了除磷亚硝化性能.批次实验显示温度从20℃下降到15℃，聚磷菌仍能保持较高的氧利用率，但AOB的SOUR下降了18%，此时是温度而不是溶解氧浓度制约了氨氧化能力.控制泥龄为30 d，同时降低曝气量为4 L·（h·L）-1，实现了低温下（15℃±1℃）除磷亚硝化颗粒污泥系统的稳定运行. |
| 英文摘要 |
| In this paper, the low C/N ratio of domestic sewage was studied, and mature phosphorus removal granules were inoculated to investigate the effect of solid retention time(SRT)on phosphorus removal and nitrification granular sludge at middle-low temperatures (14-21℃). The test showed that at room temperature (20℃±1℃), the enrichment of AOB in the phosphorus removal granules can be achieved with 30 d SRT and 5 L·(h·L)-1 aeration intensity, while the NAR was over 90%. When the temperature was lowered to 15℃ and the SRT was 40 d, the phosphorus removal performance deteriorated, and the granule structure became loose with the formation of filamentous bacteria. Relatively sufficient oxygen destabilized nitrosation and the NAR dropped by 22.4%. NOB does not have the ability to quickly adapt to environmental changes. The 12 d anaerobic starvation and sludge removal strategy weakened the relative activity of NOB and quickly restored the performance of phosphorus removal and nitrosation. Batch experiments showed that the temperature dropped from 20℃ to 15℃, and the PAOs still maintained a high oxygen utilization rate, but the SOUR of the AOB decreased by 18%. At this time, the temperature, not the dissolved oxygen concentration, restricted the ammonia oxidation ability. Controlling the sludge age to 30 d, while reducing the aeration intensity to 4 L·(h·L)-1, achieved stable operation of phosphorus removal and nitrosation at a low temperature (15℃±1℃). |
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