Thermal conversion is an effective non-traditional method for sewage sludge disposal. Herein, the application of sorption-enhanced steam gasification to sewage sludge treatment is experimentally investigated to generate hydrogen-rich syngas in a fixed bed setup. The main aim was to determine the optimal conditions and suitable sorbents for this process. CaO was selected as the sorbent, and different CaO sorbents were prepared via the sol-gel method. Al₂O₃, La₂O₃, and ZrO₂ were used as support materials for CaO to enhance the sorbent activity and stability. The CO₂ capture capacities and stabilities of the sorbents over multiple cycles were examined. Additionally, different metal additives including CoO, MgO, and CeO₂ were combined with the sorbent to increase the hydrogen mole fraction and gas yield. The integration of the support material increased the stability of the sorbents over multiple cycles. High temperature increased the syngas yield and cold gas efficiency but decreased the hydrogen mole fraction. In comparison to CaO–La and CaO–Zr, CaO–Al afforded a higher hydrogen mole fraction and yield. Moreover, as Al₂O₃ is cheaper than La₂O₃ and ZrO₂, it was selected as the most suitable support material for CaO, considering both its performance and cost. Transition metal Co was also investigated as a catalyst for gasification. A high Co loading ratio improved the hydrogen yield and cold gas efficiency but decreased the hydrogen mole fraction. These findings suggest that the CaO sorption-enhanced gasification to produce hydrogen-rich syngas is an appropriate method for sewage sludge disposal.

热转化是一种有效的非传统方法，用于处理污水污泥。在本文中，实验研究了吸附增强型气化在污水污泥处理中的应用，以在固定床装置中生成富氢合成气。主要目的是确定该工艺的最佳条件和合适的吸附剂。选择CaO作为吸附剂，并通过溶胶-凝胶法制备了不同的CaO吸附剂。Al ₂ O ₃，La ₂ O ₃和ZrO ₂用作CaO的载体材料，以提高吸附活性和稳定性。一氧化碳₂检查了吸附剂在多个循环中的捕获能力和稳定性。另外，将不同的金属添加剂（包括CoO，MgO和CeO ₂）与吸附剂结合使用，以增加氢气的摩尔分数和气体产率。载体材料的整合提高了吸附剂在多个循环中的稳定性。高温提高了合成气产率和冷气效率，但降低了氢摩尔分数。与CaO-La和CaO-Zr相比，CaO-Al的氢摩尔分数和产率更高。此外，由于Al ₂ O ₃比La ₂ O ₃和ZrO ₂便宜考虑到CaO的性能和成本，它被选为最适合CaO的载体材料。还研究了过渡金属Co作为气化催化剂。高的钴载量比提高了氢气产率和冷气效率，但降低了氢气的摩尔分数。这些发现表明，CaO吸附增强气化以生产富氢合成气是处理污水污泥的合适方法。