School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China.
School of Mechanical Engineering, Tianjin University of Commerce, Tianjin, 300134, China.
Chemosphere. 2024 Sep;364:143027. doi: 10.1016/j.chemosphere.2024.143027. Epub 2024 Aug 11.
Membrane filtration is a mainstream method for landfill leachate treatment, leaving the landfill leachate membrane concentrates (LLMCs) a high-toxicity residue. Conventional LLMCs disposal technology shows specific challenges due to the low biodegradability, high inorganic salts, and high heavy metal ions content of LLMCs. Therefore, it is necessary to degrade LLMCs with a more suitable technology. In this study, a special method was proposed to convert some organic chemicals into valuable compounds by aqueous phase reforming (APR). Ni-based catalysts (Ni//LaO, Ni/CeO, Ni/MgO, and Ni/AlO) were prepared to investigate the effect of different supports on the APR of LLMCs. APR performed outstanding characteristics in the decrease of chemical oxygen demand (COD) and total organic carbon (TOC), the degradation of macromolecules, and the removal of heavy metal ions in the aqueous phase. In addition, H was generated which is beneficial for energy compensating during the APR process. The best-performing catalyst (Ni/AlO) was selected to investigate the effects of reaction temperature, reaction time, and catalyst addition on product distribution. The optimal H selectivity (44.71%) and H production (11.63 mmol/g COD) were obtained at 250 °C with 2 g Ni/AlO usage for 1 h. This paper provided a new perspective on the disposal of LLMCs, which will degrade pollutants efficiently.
膜过滤是一种主流的垃圾渗滤液处理方法，会产生高毒性的垃圾渗滤液膜浓缩物（LLMCs）。由于 LLMCs 的生物降解性低、无机盐含量高、重金属离子含量高，传统的 LLMCs 处理技术存在一些特殊的挑战。因此，有必要采用更合适的技术来降解 LLMCs。本研究提出了一种特殊的方法，通过水相重整（APR）将一些有机化学品转化为有价值的化合物。制备了 Ni 基催化剂（Ni//LaO、Ni/CeO、Ni/MgO 和 Ni/AlO），以研究不同载体对 LLMCs 的 APR 效果。APR 在降低化学需氧量（COD）和总有机碳（TOC）、降解大分子物质以及去除水相中重金属离子方面表现出优异的特性。此外，在 APR 过程中还产生了 H，有利于能量补偿。选择性能最佳的催化剂（Ni/AlO），考察了反应温度、反应时间和催化剂添加量对产物分布的影响。在 250°C 下，使用 2g Ni/AlO 反应 1h，可获得最佳的 H 选择性（44.71%）和 H 产量（11.63mmol/g COD）。本文为 LLMCs 的处理提供了新的视角，有望高效降解污染物。
