Influence of inherent minerals on metalworking fluids sludge pyrolysis: Products characterization and heavy metals behavior
Influence of inherent minerals on metalworking fluids sludge pyrolysis: Products characterization and heavy metals behavior
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DOI：
10.1016/j.heliyon.2024.e26256
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发表时间：
2024-02
期刊：
影响因子：
4
通讯作者：
Guidan Zhu;Xingdong Wang;Xuan Yin;Mengmeng Zhu;Jiaying Li;Ling Cao;Zhiyang Sun;Hehua Zeng
中科院分区：
文献类型：
--
作者：
Guidan Zhu;Xingdong Wang;Xuan Yin;Mengmeng Zhu;Jiaying Li;Ling Cao;Zhiyang Sun;Hehua Zeng
由于金属加工液污泥 (MFS) 的高度危险特性，安全、适当地处置它仍然是一个挑战，这项工作研究了 MFS 在不同温度（500、600、700、800 和 900 °C）下的热解，以实现能量回收和 MFS 的安全处理。实验结果表明，较高温度下的固有矿物质可以提高MFS热解的气体产量并改善油气质量。 MFS 在 900 °C 下热解后，热解气体产率最高为 18.86 wt%。 GC-MS 分析表明，固有矿物质有助于减少油中含氧化合物和含氮化合物，同时导致碳氢化合物含量大幅增加。值得注意的是，在 900 °C 的热解过程中获得了最高的芳烃含量（61.16%）。此外，固有矿物质改善了 MFS 热解过程中的碳封存和生物炭的特性。生物炭中重金属的浸出量降低，从而降低了重金属相关的环境风险。这项研究表明，热解过程是同时进行能量回收和 MFS 处置的一种有前途的方法，且环境风险较低。
Safely and appropriately disposing of metalworking fluids sludge (MFS) remains a challenge owing to its highly hazardous properties, this work investigated MFS pyrolysis at various temperatures (500, 600, 700, 800, and 900 °C) for energy recovery and safety treatment of MFS. The experimental results indicated that inherent minerals at higher temperatures could enhance the gas yields and promote the qualities of oil and gas from MFS pyrolysis. The highest pyrolysis gas yield was achieved at 18.86 wt% after MFS pyrolysis at 900 °C. GC-MS analysis revealed that the inherent minerals facilitated a decrease in oxygenated and nitrogenated compounds within the oil, while simultaneously leading to a substantial increase in hydrocarbon contents. Notably, the highest content of aromatics (61.16%) was attained during pyrolysis at 900 °C. Moreover, inherent minerals improved carbon sequestration and the characteristics of biochar during the MFS pyrolysis. The leaching contents of heavy metals in biochars were reduced, thereby reducing the heavy metals associated environmental risk. This research suggests that the pyrolysis process was a promising approach for simultaneous energy recovery and MFS disposal with low environmental risk.