论文部分内容阅读
采用自主改装的变压头黏土渗透仪,模拟疏浚淤泥脱水过程中水分在淤泥颗粒多孔介质中的迁移运动过程,通过测定疏浚淤泥脱水过程中渗透系数与过滤常数、渗水量与滤液量、泥饼含水率与孔隙率,探究了负载压力为100 k Pa时,不同负载方式(负载时间及负载压力梯度变化)对疏浚淤泥脱水过程中过滤和渗流规律的影响。研究发现:负载下的过滤和渗流同时进行,负载1 h期间,前期0~40 min内过滤占主导地位,后期40~60 min内渗流起关键作用。负载压力梯度由原来1 h内间隔变化1次,变为以20 k Pa为梯度递增变化5次,随着压力变化梯度减小,渗透系数、过滤常数增加,淤泥脱水性能得到较明显的改善,并且前期负载压力越小,脱水效果越好。
The autotransformer head clay clay permeability tester was used to simulate the migration of water in the porous media of sludge particles during the process of sludge dredging. By measuring the permeability coefficient, filtration constant, water seepage and filtrate volume, Moisture content and porosity, the effect of different load modes (load time and load pressure gradient) on the filtration and seepage law in dredging sludge dewatering was investigated when the load pressure was 100 kPa. The results show that the filtration and seepage at the same time are carried out at the same time. During the period of 1 h load, the filtration dominated in 0 ~ 40 min in the early period, and the seepage plays a key role in the later 40 ~ 60 min. The load pressure gradient changed from 1 h to 1 kPa, and changed to 20 kPa gradient increment 5 times. With the decrease of pressure gradient, permeability coefficient and filtration constant increased, the sludge dewatering performance was obviously improved. And the earlier the load pressure is smaller, the better the dehydration effect.