废水生物处理颗粒污泥内三维孔隙结构研究——以厌氧氨氧化颗粒污泥为例

Three-dimensional pore structure of granular sludge in biological wastewater treatment system—taking Anammox granules as an example

颗粒污泥的三维结构极大地影响其沉降性能和结构稳定性,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结构稳定性中的作用的研究。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扫描颗粒,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,并计算颗粒污泥的绝对渗透率,为颗粒污泥系统在污水处理中的稳定高效应用提供理论依据。

Understanding the three-dimensional(3D)structure distribution of granular sludge is crucial for its settlement ability and stability,yet research on the 3D pore structure and distribution characteristics remains scarce.In this study,anerobic ammonium oxidation granular sludge is scanned using synchrotron radiation X-ray phase microscopic computed tomography,and its structure is reconstructed using Avizo.The diameter,spatial distribution,and fractal dimension of the pore structure are analyzed to establish a pore network model for granular sludge.Subsequently,absolute permeability calculations are performed.This research contributes to the theoretical foundation for the stable and efficient application of granular sludge systems in sewage treatment.