Thipkhunthod Puchong, Meeyoo Vissanu, Rangsunvigit Pramoch, Kitiyanan Boonyarach, Siemanond Kitipat, Rirksomboon Thirasak
The Petroleum and Petrochemical College, Chulalongkorn University, 245 Soi Chula 12, Phyathai Road, Pathumwan, Bangkok 10330, Thailand.
Chemosphere. 2006 Aug;64(6):955-62. doi: 10.1016/j.chemosphere.2006.01.002. Epub 2006 Feb 17.
In this study, a number of different sewage sludge including sludge samples from industrial and hospital wastewater treatment plants were characterized for pyrolysis behavior by means of thermogravimetric analysis up to 800 degrees C. According to the thermogravimetric results, five different types of mass loss behaviors were observed depending on the nature of the sludge used. Typical main decomposition steps occurred between 250 and 550 degrees C although some still decomposed at higher temperatures. The first group (Types I, II and III) was identified by main decomposition at approximately 300 degrees C and possible second reaction at higher temperature. Differences in the behavior may be due to different components in the sludge both quantitatively and qualitatively. The second group (Types IV and V), which rarely found, has unusual properties. DTG peaks were found at 293, 388 and 481 degrees C for Type IV and 255 and 397 degrees C for Type V. Kinetics of sludge decomposition can be described by either pseudo single or multicomponent overall models (PSOM or PMOM). The activation energy of the first reaction, corresponding to the main pyrolysis typically at 300 degrees C, was rather constant (between 68 and 77 kJ mol(-1)) while those of second and third reactions were varied in the range of 85-185 kJ mol(-1). The typical order of pyrolysis reaction was in the range of 1.1-2.1. The pyrolysis gases were composed of both saturated and unsaturated light hydrocarbons, carbon dioxide, ethanol and chloromethane. Most products, however, evolve at a quite similar temperature regardless of the sludge type.
在本研究中，通过热重分析对包括来自工业和医院污水处理厂的污泥样品在内的多种不同污水污泥进行了表征，直至800摄氏度。根据热重分析结果，观察到五种不同类型的质量损失行为，这取决于所用污泥的性质。典型的主要分解步骤发生在250至550摄氏度之间，尽管有些在更高温度下仍会分解。第一组（I型、II型和III型）的特征是在约300摄氏度时发生主要分解，并在更高温度下可能发生二次反应。行为上的差异可能是由于污泥中成分在数量和质量上的不同。第二组（IV型和V型）很少见，具有不寻常的特性。IV型在293、388和481摄氏度处发现DTG峰，V型在255和397摄氏度处发现DTG峰。污泥分解动力学可以用伪单组分或多组分整体模型（PSOM或PMOM）来描述。对应于通常在300摄氏度的主要热解的第一反应的活化能相当恒定（在68至77 kJ mol(-1)之间），而第二和第三反应的活化能在85 - 185 kJ mol(-1)范围内变化。热解反应的典型级数在1.1 - 2.1范围内。热解气体由饱和和不饱和轻烃、二氧化碳、乙醇和氯甲烷组成。然而，无论污泥类型如何，大多数产物在相当相似的温度下逸出。
