The denitrification treatment of secondary clarifier effluent was performed in pilot-scale biofilter with glucose,methanol,ethanol and acetic acid as external carbon source respectively. The effect of water temperature and hydraulic loading on treatment efficiency was also analyzed. Results showed that the biofilter presented perfect denitrification performance after adding external carbon source, the NO3-N removal rate ranged from 67. 1% to 83. 7%. Acetic acid was the most effective carbon source,among the 4 studied,for removing NO3-N. The NO3-N removal rate was lowest and the bacteria in filter had a long adaption phase when methanol was applied as carbon source, while methanol had the maximum utilizing rate. Water temperature had little effect on denitrification efficiency of biofilter; hydraulic loading affected the NO3-N removal of filter within a specific range,especially in biofilter with methanol as the carbon source.%以葡萄糖、甲醇、乙醇、乙酸4种有机物为碳源,以中试二沉池出水为原水,研究了生物滤池的反硝化效能,并分析了水温和水力负荷对反硝化效果的影响.结果表明,投加4种碳源后生物滤池均能有效脱氮,对NO-3-N的去除率达67.1％～83.7％.乙酸为碳源时,NO-3-N在生物滤池内浓度下降最快；甲醇为碳源时,NO-3-N浓度下降最慢,而且反硝化细菌对其需要一定的适应期,但是甲醇碳源的利用率最高.水温对生物滤池反硝化效果的影响较小,水力负荷对NO-3-N去除的影响是在一定范围内的,改变水力负荷对甲醇碳源情况下的反硝化效果影响最大,对乙酸的影响最小.
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