多环芳烃在天然水体中的自净机理研究——悬浮物沉降机理研究

Study on self purification mechanism for PAHs in natural water system ——study on sedimentation of mechanism of suspended solids

以黄浦江、淀山湖底泥为沉积悬浮物的代表，研究静态条件下天然水体中悬浮物的沉降机理。结果表明，黄浦江底泥的有机质含量大于淀山湖底泥；底泥颗粒十分细小，且表面不均匀；两种底泥悬浮物的沉降类型均属于絮凝沉降，黄浦江底泥的沉降速度较淀山湖底泥快，有机质在絮凝过程中起着粘连架桥的作用。

The sediments in Huangpu River and Dianshan Lake were chosen as suspended solids.The physical properties and sedimentation mechanism of two kinds of suspended particles were determined.The results show that the content of organic matter in the sediment of Huangpu River is higher than that of Dianshan Lake.The particles are very tiny and their sruface is uneven.The sedimentation type is classified as coagulation sedimentation for both suspended particles;and the settling velocity of suspended solids in Huangpu River is faster than that in Dianshan Lake.Organic matter is the main factor as bridge formation to enlarge suspended particles in the coagulation process.