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将适合于处理大面积高含水率淤泥的真空预压法与用于污水处理的絮凝沉淀法相结合(即药剂真空预压法)应用于工程废浆的固液分离。针对上海某桩基施工现场产生的废弃泥浆采用4种不同的絮凝剂进行了沉降柱试验,并对各自的絮凝效果进行了对比。采用最佳絮凝效果时的絮凝剂和配比,进行了室内药剂真空预压模型试验,试验过程中对出水量和废浆浆面高度进行监测;试验前后进行了含水率、颗粒分布、压汞和扫描电镜试验。试验发现:1废浆含水率从絮凝前的163%,降低到絮凝后的96%,经过真空预压后再降低到37%;2加入絮凝剂后絮体中的黏粒含量减少、粉粒含量增多,即絮凝会使小颗粒长大;3处理后废浆的孔隙率明显下降,沿径向向内逐渐减小。研究表明药剂真空预压法技术可行、效果显著,值得大范围推广。
The vacuum preloading method suitable for treating large areas of high water content sludge is combined with the flocculation and sedimentation method for wastewater treatment (ie, the vacuum preloading method of medicament) for the solid-liquid separation of engineering waste slurry. Aiming at the abandoned mud produced in a pile foundation construction site in Shanghai, four kinds of different flocculants were used to conduct settlement column test, and their flocculation effects were compared. Using the best flocculant flocculant and the ratio, the indoor pre-vacuum chemical reagent model tests were carried out during the test on the amount of effluent and waste slurry height monitoring; before and after the test moisture content, particle distribution, mercury injection And scanning electron microscope test. The results showed that: 1 The water content of waste water decreased from 163% before flocculation to 96% after flocculation, and then reduced to 37% after vacuum preloading; 2 The content of clay in the floc was decreased after adding flocculant, Content increased, that is, flocculation will make small particles grow; 3 after treatment of waste porosity decreased significantly inward along the radial gradually reduced. The research shows that the technology of vacuum preloading is feasible and the effect is remarkable, which is worth to be popularized in large scale.