目前我国大部分污水处理厂，都存在着进水碳氮比低，不能满足正常的生物反硝化脱氮的需求。所以为保证生物脱氮的正常进行，我们需要投加外加碳源，以满足污水厂正常的出水排放要求。本文选用多核碳源与通用单一类型碳源——乙酸钠、葡萄糖为外加碳源，在秦皇岛某水厂进行生产性平行对比实验，来研究多核碳源的脱氮性能和运行费用。结果表明：以多核碳源作为外加碳源相比乙酸钠，脱氮单耗降低了49.71%，吨水投加成本降低了17.41%。以多核碳源作为外加碳源比以葡萄糖，脱氮单耗降低了37.84%，吨水投加成本降低了20.83%。且在保证水厂出水稳定达标的前提下，可以实现水厂的降本增效，具有较高的市场推广价值。At present, the low C/N ratio in the sewage is existing in most of the Sewage Treatment, which cannot guarantee the demand of normal biological nitrogen removal. So in order to ensure the normal operation of biological nitrogen removal, we need to add additional carbon source. In order to verify the economic applicability of polynuclear carbon sources, a comparative experiment was carried out in a water plant in Qinhuangdao using polynuclear carbon sources, sodium Acetate and glucose as additional carbon sources. The results show that the unit denitrification consumption is increased by 49.71% and the cost is reduced by 17.41%. Using polynuclear carbon source as carbon source is 37.84% lower than using glucose as carbon source, and the cost of adding carbon source is 20.83% lower. And under the premise of ensuring the water plant to meet the standard stably, the water plant can reduce cost and increase efficiency, which has high market promotion value.