Before mature granules formation, three-frame structure formed by filamentous bacteria, bridge formed by two value metal cations and conglutination of extracellular polymers (ECPs) played important roles.

• 通过污泥培养过程照片观察以及对污泥微生物的扫描电镜观察，重点分析了上层絮状污泥颗粒化机理：在颗粒化初始和形成阶段，丝状菌形成三维框架、二价金属阳离子架桥以及胞外多聚物(ECPs)粘连的作用是非常重要的；