中文摘要：

采用小试装置的上向流石英砂反硝化生物滤池,进行碳源、碳氮比、滤速3个因素正交试验,考察反硝化生物滤池中亚硝酸盐的积累量和积累位置情况。结果表明,低滤速（0.5 m/h）出水亚硝酸盐积累率之和高于高滤速（10 m/h）。葡萄糖、甲醇、乙酸钠分别为碳源时,反硝化生物滤池的内部最大积累率分别出现在反硝化生物滤池进水端120-190 cm,80-140 cm,0-40 cm的滤层。滤池内部亚硝酸盐积累率的正交试验极差分析,极差值R（C/N）〉R（滤速）〉R（碳源类型）。C/N因素对反硝化生物滤池内部亚硝酸盐积累影响显著。葡萄糖、甲醇、乙酸钠分别为碳源时出水亚硝酸盐积累率之和分别19.2%,10.8%,4.5%。

英文摘要：

In order to explore regulation about location and quantity of nitrite accumulation in denitrification biofilter,influencing effects（ with three levels） are investigated by orthogonal test,including carbon source,C/N（ COD/NO3-- N） ratio and the speed of water which go through the biofilter. Experiments show that nitrite is easier to be accumulated at the speed of 0.5 m/ h than that of 10 m/ h. Nitrite accumulation tends to appear in the upper filter,filtering layer 120-190 cm when glucose is carbon source,nitrite mainly accumulates at the filtering layer 80-140 cm when methanol is used as carbon source and nitrite has the tendency of be accumulated in the filter near the intake when sodium acetate as carbon source. C/N greatly impacts the accumulation in the biofilter of the three. Glucose is most likely to lead to accumulate nitrite and methanol follows,and sodium acetate is easy to be used by bacteria that make nitrite least likely to be accumulated.