颗粒污泥的三维结构分布极大的影响着其沉降性能和稳定性，但是目前缺乏对颗粒污泥内部三维结构、孔隙结构分布特征等在维持颗粒稳定性中的作用等方面的研究。本文以厌氧氨氧化颗粒污泥为对象，采用同步辐射的X射线显微断层扫描成像技术对颗粒进行扫描并通过Avizo软件对颗粒污泥进行三维重构，获得了颗粒污泥中孔径、孔隙的空间分布和分形维数，建立了颗粒污泥的孔隙网络模型，并对颗粒污泥的绝对渗透率进行计算，以便为颗粒污泥系统在污水处理系统中的稳定高效应用提供理论依据。

The three-dimensional(3D) structure distribution of granular sludge is essential to its settlement ability and stability. However, there is a lack of research on the 3D pore structure and distribution characteristics. In this study, the anerobic ammonium oxidation granular sludge was scanned through synchrotron radiation X-ray phase microscopic computed tomography，with its structure being reconstructed by Avizo. The diameter, spatial distribution, and fractal dimension of the pore structure were obtained to establish the pore network model of granular sludge. Subsequently the calculation of absolute permeability was made. It is hoped that this research will make a contribution to the theoretical basis for the stable and efficient application of granular sludge system in sewage treatment.