Wang B, He S, Wang L, Shuo L
Water Pollution Control Research Center, Harbin Institute of Technology (HIT), 202 Haihe Road, Harbin, China 150090.
Water Sci Technol. 2005;52(10-11):435-42.
Experiments have been carried out to get an understanding of the effect of DO, C/N ratio and pH on the performance of a bench scale membrane bioreactor (MBR) in simultaneous nitrification and denitrification. It was found that under the conditions of MLSS in the range of 8000-9000 mg/L and temperature of water in the MBR of 24 degrees C, influent COD and NH3-N in the range of 523-700 mg/L and 17.24-24 mg/L respectively, the removals of COD, NH3-N and TN were 98%, 99% and 60%; 96.5%, 0,98% and 75%; 96%, 95% and 92%; 90%,70% and 60% respectively at DO of 6, 3, 1 and 0.5 mg/L. It was also found that the changes in C/N ratio and pH in a certain range have a slight effect on COD removal but have significant influence on the removal of NH3-N and TN. The results showed that only under the conditions that each ecological factor was maintained relatively steadily, simultaneous nitrification and de-nitrification proceeded smoothly. It was found that when C/N ratio was 30, the influent pH 7.2, the temperature of water in MBR 24 degrees C and DO 1 mg/L, as optimum conditions, the removals of COD, NH3-N and TN were 96%, 95% and 92% respectively. In addition, mechanism research on simultaneous nitrification and de-nitrification in MBR has been conducted as well.
为了解溶解氧（DO）、碳氮比（C/N）和pH值对实验室规模膜生物反应器（MBR）同步硝化反硝化性能的影响，开展了相关实验。研究发现，在混合液悬浮固体浓度（MLSS）为8000 - 9000 mg/L、MBR内水温为24℃、进水化学需氧量（COD）和氨氮（NH₃-N）分别在523 - 700 mg/L和17.24 - 24 mg/L范围内时，溶解氧为6、3、1和0.5 mg/L时，COD、NH₃-N和总氮（TN）的去除率分别为98%、99%和60%；96.5%、98%和75%；96%、95%和92%；90%、70%和60%。还发现，C/N比和pH值在一定范围内的变化对COD去除影响较小，但对NH₃-N和TN的去除有显著影响。结果表明，只有在各生态因子相对稳定的条件下，同步硝化反硝化才能顺利进行。研究发现，当C/N比为30、进水pH值为7.2、MBR内水温为24℃且溶解氧为1 mg/L时，作为最佳条件，COD、NH₃-N和TN的去除率分别为96%、95%和92%。此外，还对MBR中同步硝化反硝化的机理进行了研究。
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