Córdoba Patricia, Li Baoqing, Li Jing, Zhuang Xinguo, Querol Xavier
Institute of Environmental Assessment and Water Research (IDÆA-CSIC), Spanish National Research Council. C/Jordi Girona 18-26, 08034 Barcelona, Spain.
Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China.
ACS Omega. 2022 Apr 21;7(17):14697-14711. doi: 10.1021/acsomega.1c07326. eCollection 2022 May 3.
This paper reports on the chemical speciation and leaching behavior of a selected group of hazardous trace pollutants in lignite and lignite-petcoke blend co-combustion products from three power stations in China. The evaluation of speciation results showed that, during combustion, oxidizable elements, mainly As and Mo, bound to organic matter and sulfides in coals were mostly transferred to easily water-soluble forms or to slightly acidic states in the ashes. This manner was the most readily bioavailable condition for such an environment. The evaluation of the leaching results shows that the use of petroleum coke as co-fuel has an impact on the ash composition and on the leaching behavior of some inorganic trace pollutants such as Mo and V. The leaching results compared to the European waste acceptance criteria for landfills reveal that the Mo and As' leaching yield brand the coal combustion products as materials that necessitate preventative measures to reduce their potential leaching. Future work will be focused on the application of our novel chemical stabilization method to these coal ashes to reduce the mobility of elements such as Mo and As, and other potentially leachable elements, and on the use of the resulting ash with aggregate products as a substitute for concrete production.
本文报道了中国三个发电厂褐煤及褐煤-石油焦混合燃烧产物中一组选定的有害微量污染物的化学形态及浸出行为。形态分析结果评估表明，在燃烧过程中，煤中与有机物和硫化物结合的可氧化元素（主要是砷和钼）大多在灰分中转化为易溶于水的形态或微酸性状态。这种形态是此类环境中最易被生物利用的状态。浸出结果评估表明，使用石油焦作为共燃料会对灰分组成以及一些无机微量污染物（如钼和钒）的浸出行为产生影响。与欧洲垃圾填埋场废物接受标准相比，浸出结果表明，钼和砷的浸出率表明煤燃烧产物属于需要采取预防措施以降低其潜在浸出可能性的物质。未来的工作将集中于将我们新颖的化学稳定化方法应用于这些煤灰，以降低钼和砷等元素以及其他潜在可浸出元素的迁移性，以及将所得灰分与集料产品一起用作混凝土生产替代品的应用。
