中文摘要：

本实验研究了不同温度条件下,污泥固体在水热反应中的颗粒相形态变化过程,以及有机质在固、液相间的转化规律,并根据实验结果对污泥预热堵塞过程及成因进行分析.结果表明,蛋白质和糖是水溶液中的主要大分子中间产物,当温度大于260℃时,污泥固体极不稳定,有机质快速溶出,同时固相沉降比（SV）迅速降低.在反应初期,固体颗粒脱水速度大于有机质降解速度,造成颗粒出现团聚、固结现象,这可能是污泥预热堵塞的主要原因.当温度低于220℃时,固相有机物分解缓慢并持续溶出到液相中,蛋白质和糖在溶液中持续累积.该条件下,颗粒相形态不会快速变化,从而较长时间内保持其絮体特征.

英文摘要：

This paper investigated the morphological change of solid particles and the organic matter transformation between solid-liquid phases during the hydrothermal reaction of sewage sludge at different temperatures. Furthermore,the causes of clogging occurred in the preheaters were also investigated. The results showed that the primary macromolecular products produced in the solution were proteins and saccharides. When the temperature was beyond 260 ℃,the sludge was very labile with fast dissolution rate of organic matter. Meanwhile the settling volume ratio（SV） of solids decreased fast with time. In the initial reaction stage,the dewatering rate of solid particle was greater than the dissolving rate of solid organic matter,which resulted in obvious agglomeration phenomena.These behaviors might be the primary reasons for the clogging in the preheating process. When the temperature was below 220 ℃,the solid organic matter slowly decomposed and was continuously transferred into liquid phase with obvious accumulation of proteins and saccharides. Under thiscondition,the structure of the sludge particles remained for a long time.