Narani Shayan S, Siddiqua Sumi, Perumal Priyadharshini
School of Engineering, University of British Columbia, Kelowna, BC, V1V 1V7, Canada; Faculty of Applied Science, School of Engineering, University of British Columbia, Kelowna, BC, V1V1V7, Canada.
Faculty of Applied Science, School of Engineering, University of British Columbia, Kelowna, BC, V1V1V7, Canada.
J Environ Manage. 2024 Mar;354:120341. doi: 10.1016/j.jenvman.2024.120341. Epub 2024 Feb 15.
Wood and biomass are burned in many industries as a sustainable energy source. The large quantities of fly ash produced must be landfilled, leading to environmental concerns. Precipitator wood fly ash (PFA) and ground granulated blast furnace slag (BFS) have been used in this study to prepare alkali-activated composites to manage and recycle the fly ash. After an essential characterization, the influence of parameters such as PFA and BFS content, alkaline activator content (silica moduli of 0, 0.82, 1.32), curing method, and curing duration on the mechanical, chemical, and microstructural properties of the samples have been studied through compressive strength, density, FTIR, and SEM-EDS investigations. The environmental safety and influence of polycondensation on heavy metal stabilization have been examined through ICP-MS. The results prove that oven and hydrothermal curing obtain the early age strength. Despite the variations of strength with duration and type of curing, the compressive strength of samples after 28 days of curing tends to close values for a constant PFA/BFS ratio, due to which the need for energy-intensive curing methods is addressed. ICP-MS shows that the composites can suitably solidify As, Cd, Ba, Cr, Pb, Mo, Se, Hg, Sr, Cu, and Zn. On the other hand, the composites were almost incapable of stabilizing Co and V. Unlike the case for mechanical properties; higher PFA content favours hazardous metal stabilization through polycondensation.
木材和生物质在许多行业中作为可持续能源被燃烧。产生的大量飞灰必须进行填埋处理，这引发了环境问题。本研究中使用了沉淀木飞灰（PFA）和磨细粒化高炉矿渣（BFS）来制备碱激活复合材料，以管理和回收飞灰。在进行必要的表征后，通过抗压强度、密度、傅里叶变换红外光谱（FTIR）和扫描电子显微镜-能谱分析（SEM-EDS）研究了诸如PFA和BFS含量、碱性活化剂含量（硅模量为0、0.82、1.32）、养护方法和养护时间等参数对样品的力学、化学和微观结构性能的影响。通过电感耦合等离子体质谱（ICP-MS）检测了环境安全性以及缩聚反应对重金属稳定化的影响。结果表明，烘箱养护和水热养护能获得早期强度。尽管强度会随养护时间和养护类型而变化，但对于恒定的PFA/BFS比，养护28天后样品的抗压强度趋于接近，因此解决了对高能耗养护方法的需求。ICP-MS表明，该复合材料能够适当地固化砷、镉、钡、铬、铅、钼、硒、汞、锶、铜和锌。另一方面，该复合材料几乎无法稳定钴和钒。与力学性能情况不同；较高的PFA含量有利于通过缩聚反应实现有害金属的稳定化。
