Chen Jie, Wang Ren, Chen Zhiliang, Zhang Peng, Lin Xiaoqing, Takaoka Masaki, Li Xiaodong, Yan Jianhua
State Key Laboratory of Clean Energy Utilization, Institute of Thermal Power Engineering of Zhejiang University, Hangzhou, 310027, Zhejiang, China; Department of Environmental Engineering, Graduation School of Engineering, Kyoto University, Kyoto, 6158510, Japan.
State Key Laboratory of Clean Energy Utilization, Institute of Thermal Power Engineering of Zhejiang University, Hangzhou, 310027, Zhejiang, China.
J Environ Manage. 2025 Jan;373:123591. doi: 10.1016/j.jenvman.2024.123591. Epub 2024 Dec 12.
This study proposed a novel closed-wet accelerated carbonation method based on ultrasonic chemistry for treating municipal solid waste incineration fly ash (MSWI FA), assessing various reaction parameters (time, temperature, CO pressure, ultrasonic power, and alkaline additives) on the detoxification and synergistic carbon fixation. The mechanisms of carbon sequestration, heavy metal migration-stabilization, and PCDD/Fs migration-degradation were elucidated. Key findings include the reaction kinetic of MSWI FA ultrasonic carbonation aligning with the surface coverage model (R > 0.999), achieving a carbonation efficiency of 29.4% within 30 min. Optimal conditions-room temperature, 1-2 MPa CO pressure, and 500 W ultrasonic power-enhanced carbon sequestration and heavy metal stabilization. The formation of fine calcium carbonate resulted in the co-precipitation of heavy metals, such as Ba, Pb, and Zn, avoiding liquid phase heavy metal pollution and reducing their leaching concentrations in solid samples well below the HJ 1134-2020 standard. The particle size reduction rate was 69.9% (18.6 μm) for non-ultrasonic carbonated FA compared to 89.2% (6.7 μm) for ultrasonic carbonated FA (UFA). NaOH and ammonia addition effectively decreased calcium concentration in the carbonation reaction solution (<200 mg/L) and calcium sulfate content in UFA. The ultrasonic carbonation process prevented PCDD/Fs from migrating into the reaction solution and achieved 35.0% PCDD/Fs degradation. This comprehensive evaluation supports the viability of ultrasonic carbonation for treating MSWI FA.
本研究提出了一种基于超声化学的新型密闭湿式加速碳酸化方法，用于处理城市生活垃圾焚烧飞灰（MSWI FA），评估各种反应参数（时间、温度、CO压力、超声功率和碱性添加剂）对解毒和协同固碳的影响。阐明了碳封存、重金属迁移-稳定化以及PCDD/Fs迁移-降解的机制。主要发现包括MSWI FA超声碳酸化的反应动力学符合表面覆盖模型（R>0.999），在30分钟内实现了29.4%的碳酸化效率。最佳条件——室温、1-2MPa CO压力和500W超声功率——提高了碳封存和重金属稳定化效果。细碳酸钙的形成导致Ba、Pb和Zn等重金属共沉淀，避免了液相重金属污染，并将其在固体样品中的浸出浓度降低至远低于HJ 1134-2020标准。未超声碳酸化的FA的粒径减小率为69.9%（18.6μm），而超声碳酸化的FA（UFA）的粒径减小率为89.2%（6.7μm）。添加NaOH和氨有效地降低了碳酸化反应溶液中的钙浓度（<200mg/L）以及UFA中的硫酸钙含量。超声碳酸化过程阻止了PCDD/Fs迁移到反应溶液中，并实现了35.0%的PCDD/Fs降解。这一综合评估支持了超声碳酸化处理MSWI FA的可行性。
