Effect of basic oxygen furnace slag type on carbon dioxide sequestration from landfill gas emissions
Effect of basic oxygen furnace slag type on carbon dioxide sequestration from landfill gas emissions
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碱性氧气转炉炉渣类型对垃圾填埋气排放二氧化碳封存的影响
DOI：
10.1016/j.wasman.2019.01.013
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发表时间：
2019
期刊：
影响因子：
8.1
通讯作者：
Grubb, Dennis G.
中科院分区：
文献类型：
--
作者：
Reddy, Krishna R.;Chetri, Jyoti K.;Kumar, Girish;Grubb, Dennis G.
本研究探讨了三种不同的碱性氧气转炉（IHE-3/15，IHE-9/17，和里弗代尔）炉渣在模拟填埋气（LFG）条件下（50%CH4和50%CO2 v/v）的一系列批式和柱式实验中的二氧化碳（CO2）封存潜力。在不同水分含量（按重量计0%、10%、15%和20%水分）和温度（7 °C、23 °C和54 °C）下进行分批实验，以检查水分和温度对BOF炉渣的CO2封存潜力的影响。柱实验在连续潮湿气流条件下进行。来自分批实验的结果表明，CO2封存在潮湿状态（10%、15%、20%水分（w/w））下显著高于干燥状态（0%水分）。对于每种转炉炉渣，用于CO2封存的最佳水分含量（w/w）不同; IHE-3/15（10%）、IHE-9/17（20%）和里弗代尔（20%）。环境温度的变化对转炉渣固碳能力没有显著影响。通过长期静态实验测定了IHE-3/15、IHE-9/17和里弗代尔转炉渣的CO2固定容量分别为105 mg/g、80 mg/g和67 mg/g。IHE-3/15炉渣表现出最高的碳酸化潜力，这归因于其更细的粒度和更高的游离石灰、氢氧化钙和钾镁矾含量。与IHE-3/15炉渣相比，IHE-9/17和里弗代尔炉渣显示出显著较低的CO2封存能力。在IHE-9/17和里弗代尔炉渣中，被认为是碳酸化过程中最具反应性的矿物的游离石灰、氢氧钙石和钾镁矾的量比IHE-3/15炉渣的量少近1.3倍。此外，里弗代尔渣显示相对较低的CO2封存在柱实验相比，分批实验，可能是由于高的原位密度，限制CO2扩散，因此CO2吸收。总体而言，本研究提供了一种手段来分析使用转炉炉渣在填埋场覆盖物的适用性，以减轻从垃圾填埋场逃逸CO2排放。
This study investigates the carbon dioxide (CO2) 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% CH4and 50% CO2v/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 CO2sequestration 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 CO2sequestration 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 CO2sequestration 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 CO2sequestration capacity of the BOF slags. The CO2sequestration 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 CO2sequestration 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 CO2sequestration in column experiment in comparison to the batch experiments, perhaps due to a high in-situ density which limited CO2diffusion and hence the CO2uptake. Overall, this study provides a means to analyze the suitability of the use of BOF slags in landfill covers for mitigating fugitive CO2emissions from landfills.