Dehydration model test of high moisture content mud
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摘要: 针对实际工程中的大量疏浚淤泥和废弃泥浆，提出了一种新的絮凝–吸水联合处理方法，有效解决传统泥浆处理方法处理缓慢且成本高的难题。通过絮凝试验验证了最佳絮凝剂种类对原状疏浚淤泥的适应性，通过室内模型试验分析了不同吸水方式对絮凝后泥浆的脱水效果。结果表明：对于原状疏浚泥浆，阳离子型聚丙烯酰胺（CPAM）、阴离子型聚丙烯酰胺（APAM）和非离子型聚丙烯酰胺（NPAM）均可以获得较高的絮凝效果，可以选择0.4%的阳离子型聚丙烯酰胺（CPAM）作为最佳絮凝剂种类；竖向吸水方式在降低底泥含水率方面最为有效，能将含水率降至52%，略低于泥浆的液限53%；竖向吸水方式和竖向+表面吸水方式均可以在不同的深度获得较为均匀的干化效果；泥浆含水率降至其最优含水率的1.8～1.9倍标志着吸水过程已经完成，为实际工程中判断吸水过程是否完成提供了依据。Abstract: A new flocculation-absorption combined treatment method is proposed for a large amount of dredged mud and waste mud in actual projects, effectively solving the problem of slow treatment and the high cost of traditional mud treatment methods. The suitability of the optimal flocculant type for the original state dredged sediment was verified through flocculation tests. The dewatering effect of different water absorption methods on the flocculated mud through an indoor modeling test was analyzed. The results show that: for the primary dredged mud, cationic polyacrylamide (CPAM), anionic polyacrylamide (APAM), and nonionic polyacrylamide (NPAM) can achieve a high flocculation effect, and the best flocculant type can be 0.4% of cationic polyacrylamide (CPAM); vertical water absorption is the most effective way to reduce the water content of the mud, which can reduce the water content to 52%, slightly lower than the liquid limit of 53% of the mud; vertical water absorption and vertical + surface water absorption can be used to obtain a more uniform drying effect at different depths; the water content of the mud was reduced to 1.8～1.9 times of the optimal water content to mark the completion of the absorption process, which provides a basis for the judgment of the completion of the absorption process in the actual project.
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Key words:
- mud /
- flocculate /
- absorb water /
- moisture content /
- treatment effect
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表 1 原状疏浚泥浆絮凝试验方案
编号 絮凝剂类型 絮凝剂分子量
（×104）絮凝剂掺量
/%CPAM-0.4 阳离子型聚丙烯酰胺 1200 0.04 APAM-0.4 阴离子型聚丙烯酰胺 0.04 NPAM-0.8 非离子型聚丙烯酰胺 0.08 注：絮凝剂掺量为相对于泥浆的质量分数。 
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