| 摘要: |
| 【目的】 研究低氧膜生物反应器（MBR）中有机物对脱氮过程及污泥性能的影响。【方法】 利用一体式MBR反应器，以人工配制的生活污水为研究对象，将MBR系统运行过程分为3个阶段，3个阶段的进水化学需氧量 (Chemical oxygen demand，COD)分别为360，220和140 mg/L，依次连续运行30，20和60 d，研究不同有机负荷下污泥性能的变化特点。【结果】 在进水COD分别为360，220和140 mg/L时，系统的总氮去除率分别为89%，72%和22%；根据经典的微生物能量代谢理论并结合1，2和3运行阶段污泥浓度的变化情况，计算得到污泥真实产率(Yg)和比例常数(ms)分别为0.42，0.39，0.24 g/g和0.11，0.06,0.08 g/（g·d）。【结论】 有机物质量浓度的降低不利于同步反硝化脱氮和异养菌活性的提高，但有利于硝化菌生长，削弱了有机物对硝化作用的抑制作用；系统中活性污泥具有硝化过程和氨氮同化过程同步进行的特性，在理论上有利于低氧脱氮效率的提高；有机负荷变化对污泥产率也有一定影响。 |
| 关键词: 有机物 MBR 硝化 低氧脱氮 污泥产率 |
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| Effects of organics on biological nitrogen removal and sludge characteristics in MBR under low DO condition |
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| Abstract: |
| 【Objective】 In this paper,the effect of organic matter on the biological nitrogen removal and the characteristic of sludge in MBR under low DO condition was studied.【Method】 Simulation tests for synthetic domestic wastewater treatment were carried out in a submerged Membrane Bioreactor.The MBR system would be running at 3 different conditions to find the characteristic of sludge.First, the system would continue running 30 days with 360 mg/L COD in influent,then it would contiune running 20 days with 220 mg/L COD in influent,and finally it would run 60 days with 140 mg/L COD in influent.【Result】 Results showed that at different concentrations of influent COD of 360,220 and 140 mg/L,the corresponding removals of TN were 89%,72%,22% respectively.According to the Pirt Theory and experimental results,Yg and ms for three different influent COD concentrations could be calculated as 0.42,0.39,0.24 g/g and 0.11,0.06,0.08 g/（g·d）.【Conclusion】 The reduction of influent COD was detrimental to the simultaneous denitrification.On the other hand,the “reduction” alleviated the restraining effects of organics on nitrification,which was benefited from the increase of activity of nitrification and the decrease of that for organic degradation in the system.This consequently made it possible that ammonia could be utilized for both assimilation and nitrification concurrently,which in theory favored the nitrogen removal under low DO condition.Variation of organic loading also affected sludge production. |
| Key words: organic matter MBR nitrification nitrogen removal under low DO condition sludge yield |
