University of Illinois at Chicago, Department of Civil & Materials Engineering, 842 West Taylor Street, Chicago, IL 60607, USA.
Fugacity LLC, 126 Veronica Lane, Lansdale, PA 19446, USA.
Waste Manag. 2019 Feb 15;85:425-436. doi: 10.1016/j.wasman.2019.01.013. Epub 2019 Jan 16.
This study investigates the carbon dioxide (CO) sequestration potential of three different basic oxygen furnace (BOF) slags (IHE-3/15, IHE-9/17, and Riverdale) subjected to simulated landfill gas (LFG) conditions (50% CH and 50% CO v/v) in a series of batch and column experiments. Batch experiments were performed at different moisture contents (0%, 10%, 15% and 20% moisture by weight) and temperatures (7 °C, 23 °C and 54 °C) to examine the effect of moisture and temperature on the CO sequestration potential of the BOF slags. The column experiments were conducted under continuous humid gas flow conditions. The results from the batch experiments show that the CO sequestration was significantly higher in a moist state (10%, 15%, 20% moisture (w/w)) versus the dry state (0% moisture). The optimum moisture content (w/w) for CO sequestration was different for each BOF slag; IHE-3/15 (10%), IHE-9/17 (20%) and Riverdale (20%). The variation in ambient temperature did not show any significant effect on the CO sequestration capacity of the BOF slags. The CO sequestration capacity of IHE-3/15, IHE-9/17 and Riverdale BOF slags determined by long-term batch experiments were 105 mg/g, 80 mg/g and 67 mg/g, respectively. The IHE-3/15 slag demonstrated the highest carbonation potential and was attributed to its finer particle size and higher free lime, portlandite and larnite content. The IHE-9/17 and Riverdale slags showed significantly lower CO sequestration capacity in comparison to the IHE-3/15 slag. The amount of free lime, portlandite and larnite, which are considered to be the most reactive minerals during carbonation, was nearly 1.3 times less than that of the IHE-3/15 slag in the IHE-9/17 and Riverdale slags. Also, the Riverdale slag showed relatively lower CO sequestration in column experiment in comparison to the batch experiments, perhaps due to a high in-situ density which limited CO diffusion and hence the CO uptake. Overall, this study provides a means to analyze the suitability of the use of BOF slags in landfill covers for mitigating fugitive CO emissions from landfills.
本研究调查了三种不同的碱性氧气转炉（BOF）炉渣（IHE-3/15、IHE-9/17 和 Riverdale）在模拟垃圾填埋气（LFG）条件（50% CH 和 50% CO v/v）下的二氧化碳（CO）固存潜力，在一系列批处理和柱实验中进行。批处理实验在不同的水分含量（0%、10%、15%和 20%的重量）和温度（7°C、23°C 和 54°C）下进行，以研究水分和温度对 BOF 炉渣 CO 固存潜力的影响。柱实验在连续加湿气体流动条件下进行。批处理实验的结果表明，在潮湿状态（10%、15%、20%的水分（w/w））下，CO 的固存率明显高于干燥状态（0%的水分）。对于每种 BOF 炉渣，最佳水分含量（w/w）都不同；IHE-3/15（10%）、IHE-9/17（20%）和 Riverdale（20%）。环境温度的变化对 BOF 炉渣的 CO 固存能力没有显示出任何显著影响。通过长期批处理实验确定的 IHE-3/15、IHE-9/17 和 Riverdale BOF 炉渣的 CO 固存能力分别为 105mg/g、80mg/g 和 67mg/g。IHE-3/15 炉渣表现出最高的碳酸化潜力，这归因于其更细的颗粒尺寸和更高的游离石灰、水化石榴石和钙沸石含量。与 IHE-3/15 炉渣相比，IHE-9/17 和 Riverdale 炉渣的 CO 固存能力明显较低。在 IHE-9/17 和 Riverdale 炉渣中，被认为是碳酸化过程中最具反应性的矿物的游离石灰、水化石榴石和钙沸石的含量几乎比 IHE-3/15 炉渣低 1.3 倍。此外，与批处理实验相比，Riverdale 炉渣在柱实验中的 CO 固存率相对较低，这可能是由于原位密度较高，限制了 CO 的扩散，从而限制了 CO 的吸收。总的来说，本研究提供了一种分析碱性氧气转炉炉渣在垃圾填埋覆盖物中使用的适宜性的方法，以减轻垃圾填埋场逸出的 CO 排放。
