为解决传统液态有机碳源在反硝化过程中投加过量或不足等问题，利用相转化法制备了以淀粉为碳源、聚砜为骨架的固体缓释碳源。利用扫描电子显微镜对固体碳源表面微观结构进行了表征，并考察了不同原料质量比的缓释碳源在反硝化间歇实验中对NO₃^--N的去除效率及出水COD和NO₂^--N浓度。结果表明，当m（淀粉）：m（聚砜）为1：1时，反硝化效果最好，此时出水COD为40 mg/L，NO₃^--N的去除率高达93%，并且没有NO₂^--N的积累，为开发环境友好的可控性缓释碳源提供了科学依据。

In order to solve the problem that the addition of traditional liquid organic carbon source is excessive or insufficient during denitrification,a solid slow-release carbon source is prepared via the phase conversion method with starch as carbon source and polysulfone as framework.Surface microstructure of the carbon source is characterized by scanning electron microscopy.The removal efficiency of NO₃^--N,and the concentrations of COD and NO₂^--N in the effluent are investigated over slow-release carbon source with different mass ratios (the ratio of starch to polysulfone is 1:3,1:1 and 3:1,respectively) in batch denitrification test.Results show that the denitrification performs best with a COD concentration of 40 mg·L^-1 and a removal rate of NO₃^--N as high as 93% when the mass ratio of starch/polysulfone is 1:1.Furthermore,there is no accumulation of NO₂^--N,which provides a scientific basis for the development of environmentally friendly controllable sustained-release carbon sources.

王全勇(1969-),男,博士生,教授级高工,研究方向为水污染控制理论及应用