固化污泥的工程性质及微观结构特征

通过室内试验，向污泥中添加不同比例的石灰、土和粉煤灰，研究了不同配合比下固化污泥的工程性质。研究发现，采用适当的配合比情况下，固化污泥的强度可以满足填埋的要求，渗透性也有很大提高；采用冷冻干燥技术和扫描电镜研究了固化污泥的微观结构，发现固化后污泥的密实性有较大的提高，这是其强度提高的一个重要原因；应用分形几何的理论，对由扫描电镜获取的固化污泥微观结构图像进行了定量分析，结果表明，分形维数和强度之间有较强的正相关性。

Engineering properties and microstructure feature of solidified sludge

Landfill is a prevalent method for wastewater sludge disposal.Laboratory tests were conducted to study engineering property of sludge solidified by fly ash,lime and silty clay of varied ratios.The experiment results revealed that the strength of solidified sludge was as high as it is required for landfill;and permeability was improved significantly.Using freeze-drying technology and scanning electron microscope(SEM),the microstructure of solidified sludge is studied.It is found that the compactness of sludge was improved after solidification,which is an important reason for strength improvement.Applying theory of fractal geometry,quantitative analysis is carried out on the SEM images.The analysis reveals a considerable positive correlation between fractal dimension and strength.