襄阳护城河清淤底泥处理工艺改进及工程设计

Dredging Sediment Treatment Process Improvement and Project Design of Xiangyang Moat

针对清淤淤泥体量大、含水率高、絮凝沉淀困难等特点,襄阳护城河清淤底泥处理工程参照武汉东湖通道湖底淤泥处理工程设计运行经验,将含水率为95%的清淤泥浆经固结压滤脱水形成含水率≤35%的脱水泥饼。固结压滤脱水改进工艺对泥浆调节池及尾水回用系统进行了适用性改造,减小了占地面积,加快了泥水分离,提高了泥浆进料浓度。泥浆进料时间由每流程55 min降至每流程40 min,每台(套)设备可多处理186.6 m3/d水下自然方底泥,每台机每流程可节省22.5 kW·h电能,实现了河湖清淤底泥的快速高效处理,可为类似项目提供借鉴。

Aiming at the characteristics of large volume,high water content and difficulty in flocculation and sedimentation of dredging sediment,the treatment project of Xiangyang moat was constructed referring to the design and operation experience of Wuhan Donghu Lake channel project.The water content was reduced from 95%in the original dredging sludge to no more than 35%in the sludge cake.The modified consolidation pressure filtration dewatering process has enhanced the applicability of mud regulating tank and tail water reuse system,which reduced the occupied floor area,accelerated the separation of mud and water and increased the mud feed concentration.Specifically,the mud feeding time was reduced from 55 min per flow to 40 min per flow,each set of equipment could treat additional 186.6 m3 underwater natural bottom mud per day and save 22.5 kW·h energy per cycle.The upgraded process realized the rapid and efficient treatment of river and lake dredging sediment,which could provide reference for similar projects.