中文摘要：

目的研究武汉市巡司河底淤泥在不同无机絮凝剂及PAM的助凝作用下淤泥清浑分界面的沉降速率、淤泥浓缩比以及淤泥沉降指数的变化情况。方法采用实验研究的方法,对巡司河底淤泥进行沉降实验,并通过沉降分析找到最佳脱水效果的脱水剂。结果当淤泥质量分数为10%时,Ca（OH）2取得的絮凝脱水效果最好,Ca（OH）2投加比为5 g/L,PAM投加比为0.04 g/L时,淤泥清浑分界面的沉降速率最大可达到3.7 cm/min,淤泥浓缩比为3.94,淤泥沉降指数为24.9%。结论 Ca（OH）2和PAM对巡司河底淤泥的脱水有促进效果,淤泥在Ca（OH）2和PAM共同作用下先后经历了自由沉降、絮凝沉降、区域沉淀和压缩沉降。

英文摘要：

Objective To study the variation of sedimentation rate, concentration ratio and sludge settling index of the suspension-water interface of silt from the Xunsi River in Wuhan under different dosages of Ca（OH）2 and PAM. Methods Sedimentation test was carried out for silt from the Xunsi River in Wuhan. The dehydrating agent with optimum dehydration effect was found out through the test. Results The results showed that when the mass fraction was 10%, silt dehydration had the optimum effect with the dose ratio of Ca（OH）2 5 g/L and PAM 0.04 g/L. In the best situation, the sedimentation rate of the suspension-water interface could reach 3.7 cm/min, the concentration ratio 3.94, and the sludge settling index 24.9%. Conclusion Ca（OH）2 and PAM can promote the dehydration of the silt. Silt has gone through four processes： free sedimentation, flocculation sedimentation, regional sedimentation and compression sedimentation under the combined effect of Ca（OH）2 and PAM.