絮凝-带式压滤技术在泥水盾构隧道泥浆处理中的应用

Application of Flocculation Belt Filtering Technology in Treatment of Slurry Shield Tunnel Waste Material

随着城市建设的发展,大直径泥水盾构工程越来越趋向城市中心地带,如何高效率、低能耗、绿色环保地对泥水盾构产生的废弃泥浆进行处理成为工程面临的一大难题.以京沈客专望京隧道工程为背景,针对该工程地质条件下泥水处理的难点和工程进度等实际情况,对直接排放、泥浆固化、化学絮凝、板框压滤、离心分离等处理方式进行适应性分析,将絮凝-带式压滤快速脱水减量技术应用到工程实际,并且开展现场试验研究,比选出适应本工程废浆处理的絮凝剂类型及其最佳添加量,设置合理的带式压滤系统,满足了每天2 700 m^3的泥水快速脱水需求,不仅实现了泥浆绿色、高效处理,还节约了成本,具有极大的经济效益和社会推广价值.

With the development of urban construction, the large-diameter mud-water shield project has become a trend more and more approaching to the center of the city. How to deal with the waste mud coming from the mud-water shield with high efficiency, low energy consumption and green environmental protection? It has become a major problem. In the context of the Wangjing Tunnel Project, the direct discharge, mud solidification, chemical flocculation, plate and frame pressure filtration, centrifugal separation and other treatment methods were applied to the actual conditions with the difficulty of mud water treatment under the engineering geological conditions and the schedule of the project. The rapid dehydration technology with flocculation belt filtering was applied to engineering practice, the field test research was carried out. The type of flocculant suitable for the treatment of waste water was compared and selected in this project, and its optimal addition amount was also determined. The reasonable belt type filters were arranged to meet the demand for rapid dewatering of muddy water of 2 700 m^3 per day. It could not only realize green and efficient treatment of mud, but also save the cost, which has great economic benefits and social popularization value.