Zhang Zeying, Song Xue, Liu Yongde, Zhang Jie, Yan Guihua, Wang Feiyue, Su Zengchen, Xiao Longjie, Fu Hailong
College of Environmental Engineering, Henan University of Technology, Zhengzhou, Henan, 450001, China.
College of Environmental Engineering, Henan University of Technology, Zhengzhou, Henan, 450001, China; Zhengzhou Key Laboratory of Organic Waste Resource Utilization, Zhengzhou, Henan, 450001, China.
J Environ Manage. 2025 Sep;392:126755. doi: 10.1016/j.jenvman.2025.126755. Epub 2025 Jul 31.
Municipal solid waste incineration fly ash (MSWI FA) has been used for CO sequestration, but the synergistic effects of mechanical and ammonium salt treatment on both sequestration efficiency and treatment safety require further study. This study proposed an integrated approach that combined ball milling, ultrasound, and ammonium salt treatment to enhance CO sequestration efficiency in FA while significantly reducing heavy metal content, thereby ensuring its safe recycling and utilization. The results demonstrated that optimal CO sequestration efficiency and minimal heavy metal leaching were achieved when using (NH)HPO (40 g/L), (NH)PO (60 g/L), and CHCOONH (40 g/L). After 6 h of wet ball milling and 2 h of ultrasound, the treated FA exhibited the best performance. However, if ammonium salt treatment was not applied, heavy metal leaching still failed to meet safety standards. When mechanical treatment was combined with CHCOONH solution, the CO sequestration capacity of FA reached 0.161 g CO/g FA, while compliance with safety standards was ensured. Furthermore, the recycling potential and application prospects of the treated FA were evaluated, indicating its broader utilization potential. This study successfully achieved the dual objectives of carbon sequestration and FA detoxification, providing an effective strategy for waste treatment.
城市固体废弃物焚烧飞灰（MSWI FA）已被用于二氧化碳封存，但机械处理和铵盐处理对封存效率和处理安全性的协同效应仍需进一步研究。本研究提出了一种综合方法，该方法结合了球磨、超声和铵盐处理，以提高飞灰中二氧化碳的封存效率，同时显著降低重金属含量，从而确保其安全回收利用。结果表明，使用（NH₄）₂HPO₄（40 g/L）、（NH₄）₃PO₄（60 g/L）和CH₃COONH₄（40 g/L）时，可实现最佳的二氧化碳封存效率和最低的重金属浸出。经过6小时的湿球磨和2小时的超声处理后，处理后的飞灰表现出最佳性能。然而，如果不进行铵盐处理，重金属浸出仍不符合安全标准。当机械处理与CH₃COONH₄溶液结合时，飞灰的二氧化碳封存能力达到0.161 g CO₂/g FA，同时确保符合安全标准。此外，对处理后的飞灰的回收潜力和应用前景进行了评估，表明其具有更广泛的利用潜力。本研究成功实现了碳封存和飞灰解毒的双重目标，为废物处理提供了一种有效策略。
