Assessing the carbonation potential of wood ash for CO2 sequestration

Abstract

Abstract

Wood ash, a byproduct of wood combustion, poses environmental challenges when disposed of in landfills. This study explores a sustainable alternative by investigating the carbonation of wood ash, a process converting CO2 into stable carbonate minerals. With increasing concerns about waste management, this research aims to identify optimal carbonation conditions by varying relative humidity, liquid-to-solid ratio (L/S), and temperature. Results demonstrate that the ideal conditions for wood ash carbonation involve a moderate relative humidity of 55%, room temperature at 25 °C, and a lower L/S ratio. Thermogravimetric analysis (TGA) indicates that extended curing times increase CaCO3 formation. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) confirm the presence of carbonate phases. Mechanical strength tests reveal that samples with lower porosity and higher carbonation products exhibit superior strength. This study contributes to the understanding of wood ash carbonation but also emphasizes its potential practical applications in construction materials as light aggregates in cement concrete. The research explores the implications for sustainable waste management, offering insights into environmentally and economically viable solutions for wood ash recycling.

摘要

草木灰是木材燃烧的副产品，直接填埋会导致环境问题。本文提出了一种可持续的替代方案，通过调控草木灰的碳化过程，将CO 转化为稳定的碳酸盐。在废弃物处理日益受到关注的背景下，本文通过调节相对湿度、液固比(L/S)和温度，确定了最佳碳化条件。研究结果显示，草木灰碳化的理想条件是相对湿度55%、室温25℃以及较低的液固比。热重分析(TGA)表明，延长养护时间可以促进CaCO 的生成；扫描电镜(SEM)和X射线衍射(XRD)证实了碳酸盐相的存在。力学性能试验表明，孔隙率低且碳化程度高的试件具有更高的强度。本研究不仅有助于理解草木灰的碳化过程，还强调了其在制备轻质骨料等建筑材料中的应用价值，提供了一种可行的、环保且经济的草木灰回收解决方案。