• 关键词：生物反硝化  挥发性脂肪酸（VFA）  消化污泥上清液（DSS）  硝酸盐  碳氮比（C／N）．

• 基金项目：

• 徐亚同
• 华东师范大学环境科学系, 上海 200062

• 摘要：当用挥发性脂肪酸（VFA）作碳源时, 异化反硝化的耗碳量为1.07mg/mg（VFA-C/NO₂^--N）.用于同化合成的碳仅占所加碳源的一部分, 随着进水C/N的提高, 污泥产率Y_N增加, 出水氧化态氮N降低。在pH7.5、温度25℃、污泥产率0.72mg/mg（VSS/NO_x^--N）时, 对完全反硝化所需的VFA-C/NO₃-N临界值为1.43.VFA是消化污泥上清液（DS

• Abstract：When VFA are used as carbon sources,carbon consumed for denitrifica-tion is close to 1.07mg/mg（VFA-C）/（NO₈-N）.The carbon for assimilationoccupies only a part of carbon source added.The sludge yield（Y_N）is in-creased and effluent oxidized nitrogen decreased with the increase of influentC/N.Under the condition of pH 7.5,temperature 25℃,sludge yield 0.72mg（VSS）/mg（NO₈-N）,the critical value of influent VFA-C/NO₃-N is 1.43for complete denitrification.The main constituents of DSS are VFA.Undertested condition,the critical value of DSS for complete denitrification is 1.74mg（C）/mg（NO-N）.Only a small part of TKN is used for assimilatorysynthesis,the others enter the denitrification system.

• Key words：Biological denitrification:volatile fatty acids(VFA)  dige-sted sludge supernatant(DSS)  nitrate  C/N ratio.

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