Qu Xuetong, Wang Yanan, Chen Feifei, Li Chuqiao, He Yunfei, Dou Jibo, Zhang Shuai, Ding Jiafeng, Zhang Hangjun, Zhong Yuchi
School of Engineering, Hangzhou Normal University, Hangzhou 310018, China.
Zhejiang Provincial Key Laboratory of Wetland Intelligent Monitoring and Ecological Restoration, Hangzhou 311121, China.
Toxics. 2025 Jul 14;13(7):588. doi: 10.3390/toxics13070588.
The resource utilization potential and environmental impact of fly ash from municipal solid waste incinerators (MSWIs) have attracted wide attention. In this study, four MSWIs in Hangzhou, Zhejiang Province were selected to systematically evaluate the effects of different incinerator types and flue gas deacidification processes on fly ash's oxide and heavy metal components and their temporal changes as well as conduct risk assessment. The results showed that the contents of MgO, AlO, SiO, and FeO in the grate furnace fly ash were significantly lower than those in the fluidized bed fly ash, but the compressive strength of its fly ash was high. Chemicals added during the flue gas deacidification process such as CaO and NaHCO significantly affected the contents of CaO and NaO. In addition, heavy metals such as Cu, Mn, Cr, and Ni were mainly distributed in the fluidized bed fly ash, while heavy metals such as Pb and Cd were mainly collected in the grate furnace fly ash. The concentrations of various components in the fly ash fluctuated but were not significant under different time dimensions. Risk assessment indicated that heavy metals such as Cd, Pb, and Sb posed a high risk. This study is expected to provide theoretical support for the safe management and resource utilization of fly ash.
城市生活垃圾焚烧炉（MSWIs）飞灰的资源利用潜力和环境影响已引起广泛关注。本研究选取了浙江省杭州市的四座城市生活垃圾焚烧炉，系统评估不同焚烧炉类型和烟气脱酸工艺对飞灰中氧化物和重金属成分及其随时间变化的影响，并进行风险评估。结果表明，层燃炉飞灰中MgO、AlO、SiO和FeO的含量显著低于流化床飞灰，但层燃炉飞灰的抗压强度较高。烟气脱酸过程中添加的CaO和NaHCO等化学物质显著影响了CaO和NaO的含量。此外，Cu、Mn、Cr和Ni等重金属主要分布在流化床飞灰中，而Pb和Cd等重金属主要收集在层燃炉飞灰中。在不同时间维度下，飞灰中各成分的浓度有波动但不显著。风险评估表明，Cd、Pb和Sb等重金属具有较高风险。本研究有望为飞灰的安全管理和资源利用提供理论支持。
