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Correlation between dewatering and hydro-textural characteristics of sewage sludge during drying

机译：干燥过程中污泥的脱水与水力结构特征的相关性

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摘要

The aim of this work consists in analysing the dewatering and the shrinkage of a residual urban sludge during convective drying with the objective to find correlations between dewatering and hydro-textural characteristics of the sludge. Laboratory drying experiments are performed in immobile atmosphere, at a temperature of 30 °C, with various relative humidities. Kinetics curves of dewatering and deformation are obtained. A coupled analysis of dewatering and induced volume shrinkage is proposed. This analysis allows: (i) to distinguish the respective parts played by the intrinsic characteristics of the sludge and the process parameter and (ii) to find correlations between the hydro-textural characteristics of the sludge, and its drying and shrinkage aptitudes. Attention is given to the fact that the process parameter, i.e. relative humidity, controls the first constant rate period of the dewatering and that the hydro-textural state of the sludge determine the transitions between the different dewatering periods. The relationships between the hydro-textural characteristics and the dewatering and shrinkage aptitude allow predicting the sludge behaviour during drying according to its characteristics, which is essential information in the choice of the drying strategy.
机译：这项工作的目的在于分析对流干燥过程中残留城市污泥的脱水和收缩，目的是发现污泥的脱水和水文纹理特征之间的相关性。实验室干燥实验是在温度为30°C，相对湿度不同的固定气氛中进行的。得到了脱水和变形的动力学曲线。提出了脱水和引起体积收缩的耦合分析。该分析允许：（i）区分污泥的固有特性和工艺参数所扮演的各个部分，以及（ii）找出污泥的水-质地特性与其干燥和收缩能力之间的相关性。注意以下事实：工艺参数，即相对湿度，控制脱水的第一恒定速率周期，并且污泥的水-质地状态决定了不同脱水周期之间的过渡。水纹结构特征与脱水收缩率之间的关系可以根据污泥的特性预测污泥在干燥过程中的行为，这是选择干燥策略时必不可少的信息。

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