中文摘要：

为解析工艺运行过程中氨氧化能力和硝化能力变化的原因，研究了冬季活性炭层上微生物的硝化性能。结果表明，在冬季，当有机碳浓度不高、溶解氧充足时，活性炭层对氨氮的去除率达到34％，0．3、0．8、1．3、1．6133处（自上而下）的炭层对氨氮的平均去除率分别为5．2％、8．3％、11．5％、8．8％。不同活性炭层上的生物量差别不是太大，均值为17．1×10^8个E．coli／g活性炭。亚硝化菌、硝化茵占细菌总数的比例较大，已成为优势种群。

英文摘要：

To analyze the reasons for the variations of ammonia oxidation and nitrification ability of the process, the nitrification performance of microorganisms on activated carbon beds in winter was stud- ied. The results show that the total removal rate of NH4＋ - N is 34% and its different removal rates at 0.3 m, 0.8 m, 1.3 m and 1.6 m are 5.2% , 8.3% , 11.5% and 8.8% respectively owing to the sufficient dissolved oxygen and low TOC. Biomass on different activated carbon beds is approximate and its average value is about 17.1 ×10^8 E. coli/g. The ratios of nitrosobacteria and nitrobacteria in total bacteria are rather high, which become the dominant community in the system.