基于批沉降实验研究活性污泥沉降速率

运用批沉降实验研究了活性污泥的区域沉降和压缩沉降规律，确定了沉降特性参数．考察了经验公式法确定区域沉降速率参数，发现其与实验测定值存在较大的差异．建立了一个关于压缩沉降过程中污泥层高度与时间的数学模型，给出了模型中参数的估计方法；运用批沉降实验数据对模型进行了验证，结果表明模型能够较为理想地描述压缩沉降过程．并在该模型的基础上，提出了判断区域沉降到压缩沉降临界点的理论公式，导出了一个新的压缩沉降速率公式，表明压缩沉降速率不仅和沉降时间有关．还和污泥的初始浓度及污泥层初始高度有关．

Activated Sludge Settling Process in the Batch Settling Tests

Based on the batch settling tests,the discipline of zone and compression settling activated sludge are studied.The parameters of Vesilind form used for estimation of stirred zone settling are determined by the experimental measurement and experiential formula,and the significant differences between them are found.According to the regression relation between height of the sludge blanket(SBH) and time,a mathematical model describing compression settling is(advanced) and the methods for its parameters estimation are structured.Furthermore,the validation of the model is(approved) by the experiments. From the model,the authors deduce a theoretical equation for determining the change-over point where the compression settling commences,and a new experiential velocity function of compression settling related to the settling time,initial sludge concentration and SBH.