Department of Energy Systems Engineering, Seoul National University, Seoul, Republic of Korea.
Department of Energy Resources Engineering, Research Institute of Energy and Resources, Seoul National University, Seoul, Republic of Korea.
Chemosphere. 2019 Apr;221:75-80. doi: 10.1016/j.chemosphere.2019.01.032. Epub 2019 Jan 7.
Shale gas produced water is a by-product from shale gas production which causes environmental issues and needs for a wastewater treatment process. Lithium is one of the valuable metals that exists in the shale gas produced water, and it can be recovered during the water treatment process. However, the concentration of organic carbon in the produced water is significantly high, and these organic compounds may affect the lithium recovery efficiency. Therefore, the lithium adsorption from shale gas produced water containing organic compounds was carried out in this study to observe the influence of organic compounds on lithium adsorption using HTiO adsorbent. The equilibrium time from the kinetic study and the maximum adsorption capacity calculated from the Langmuir isotherm equation decreased with the addition of organic compounds to the produced water. Overall, lithium was selectively recovered from the pH buffered shale gas produced water with or without organic compounds. However, the results indicate the addition of organic compounds, especially the smaller-molecular-weight organic compound, to the produced water inhibits the lithium adsorption significantly.
页岩气生产水是页岩气生产的副产品，会造成环境问题，需要进行废水处理。锂是存在于页岩气生产水中的有价值金属之一，可以在水处理过程中回收。然而，生产水中的有机碳浓度非常高，这些有机化合物可能会影响锂的回收效率。因此，本研究采用 HTiO 吸附剂，从含有有机化合物的页岩气生产水中吸附锂，以观察有机化合物对锂吸附的影响。动力学研究的平衡时间和朗缪尔等温方程计算的最大吸附容量随着生产水中有机化合物的添加而降低。总的来说，无论是否含有有机化合物，锂都可以从 pH 缓冲的页岩气生产水中选择性回收。然而，结果表明，向生产水中添加有机化合物，特别是小分子有机化合物，会显著抑制锂的吸附。
