Research on the feasibility of using residual sludge supernatant fluid after ethanol type fermentation as an additive carbon source for denitrification has been studied. In addition ,contrast tests on the denitrifying characteris-tics of supernatant,methanol and domestic sewage as additive carbon sources has been accomplished.. The results show that under the same experimental conditions ,when supernatant and domestic sewage are used as denitrification carbon sources,the degradation process of NO3--N in the process of system denitrification is divided into three stages,while methanol is used as the carbon source,the degradation process of NO3--N is divided into two stages. It is also found in the contrast tests that using supernatant fluid,instead of methanol, as the additive carbon source in the process of system denitrification ,high denitrification rate can be maintained ,while low operation cost reduced.%研究了将经乙醇型发酵后剩余污泥上清液作为反硝化外加碳源的可行性，并进行了上清液、甲醇和生活污水作为外加碳源的对比试验。结果表明，在相同的试验条件下，采用上清液和生活污水作为反硝化碳源时，系统反硝化过程中NO3--N的降解过程分为三个阶段，而以甲醇作为碳源时，NO3--N的降解过程为两个阶段；对比试验还发现，采用上清液代替甲醇作为反硝化系统的外加碳源，可在保持高反硝化速率的同时降低运行成本。
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