Understanding the role of the exothermic pyrolysis is important for the design of reactors and gasifiers that seek to convert or even destroy fecal matter. In the present work, we reveal clear experimental evidence of fecal matter exothermic pyrolysis from human, pig, and chicken, under the conditions of differential scanning calorimetry. The results suggested that the strong exothermicity is related to the presence of inorganic elements in feces, Fe, Cu, Si, Pb, and Al, catalyzing the exothermic reactions, such as the partial fixed carbon oxidation and the inorganic reduction reactions. The pig feces presented the highest inorganic content, and the lowest fixed carbon content, 4.21 wt%. For all samples, the exothermicity of pyrolysis overcame endothermic reactions, leading to a maximum positive balance of 631.84 J/g. The pyrolysis efficiency reached values up to 10%. Based on the experimental evidence, a conceptual mechanism leading to exothermicity was drew for heterogeneous and homogeneous exothermic reactions affecting positively the overall energy balance of pyrolysis.

中文翻译：

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惰性气氛下粪便热解的强放热性

了解放热热解的作用对于寻求转化甚至破坏粪便的反应器和气化器的设计很重要。在目前的工作中，我们揭示了在差示扫描量热法条件下人类、猪和鸡的粪便物质放热热解的明确实验证据。结果表明，强放热性与粪便中无机元素Fe、Cu、Si、Pb和Al的存在有关，它们催化了部分固定碳氧化和无机还原反应等放热反应。猪粪中无机物含量最高，固定碳含量最低，为 4.21 wt%。对于所有样品，热解的放热性克服了吸热反应，导致最大正平衡为 631.84 J/g。热解效率高达10%。基于实验证据，为积极影响热解的整体能量平衡的非均相和均相放热反应得出了导致放热的概念机制。