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Thermochemical treatment of sewage sludge by integration of drying and pyrolysis/autogasification

机译:干燥与热解/自动气化相结合对污水污泥进行热化学处理

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An integrated treatment of sewage sludge by drying and pyrolysis/autogasification was proposed. First, the experiments of sewage sludge (SS) drying and pyrolysis were performed in TG/MS set-up and the kinetic experiments were evaluated. Additionally, SS was investigated by rheometry, elemental analysis and X-ray powder diffraction; the product, - pyrolytic coke was also analyzed by elemental analysis and XRD. Then the experiments were performed in a pilot scale system (at the feed rate of 40 kg/h) containing a contact dryer SHTS, Kenki Co, and Spirajoule (R) pyrolysis reactor. Two types of SS from a wastewater treatment plant (WWTP) near Compiegne, France with and without lime were investigated. The pyrolysis was performed at temperatures of 400 degrees C and 800 degrees C for SS with lime and in 800 degrees C for SS without lime, for the sludge residence time of 15 and 20 min. The pyrolytic gas possesses high calorific value (up to 19 MJ/m(3)) and could be totally utilized for low-pressure steam production necessary for SS drying. Based on the obtained results, scaling up of the integrated processes of drying and pyrolysis was performed in a mobile unit with a capacity of 100 kg/h, which was constructed and assembled in a shipping container and tested at a WWTP in Elblag, Poland. The energy balance for the integrated process of drying and pyrolysis/autogasification is presented in a Sankey's graph.
机译:提出了一种通过干燥和热解/自气化对污水污泥进行综合处理的方案。首先,在TG / MS装置中进行了污水污泥(SS)干燥和热解的实验,并对动力学实验进行了评估。另外,通过流变学,元素分析和X射线粉末衍射研究了SS。还通过元素分析和XRD分析了产物-热解焦炭。然后,在中试规模的系统(进料速度为40 kg / h)中进行实验,该系统包含接触式干燥机SHTS,Kenki Co和Spirajoule(R)热解反应器。研究了来自法国Compiegne附近的废水处理厂(WWTP)的两种SS,有无石灰。对于含石灰的SS,在400℃和800℃的温度下进行热解;对于不含石灰的SS,在800℃的温度下进行热解,污泥停留时间为15和20分钟。热解气体具有很高的热值(高达19 MJ / m(3)),可以完全用于SS干燥所需的低压蒸汽生产。根据获得的结果,在移动能力为100 kg / h的移动单元中进行干燥和热解集成过程的放大,该单元在运输集装箱中构建和组装,并在波兰Elblag的WWTP中进行了测试。干燥和热解/自动气化的集成过程的能量平衡显示在Sankey的图中。

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