ABSTRACT

Harmful effects of aqueous metal pollutants and benefits of recycling drive the need for wastewater treatment and recovering metals for reuse. Supported liquid membrane (SLM) separation is one of the potential energy-efficient techniques that can recover metal ions selectively, but improvements in transport rate and stability are needed to improve treatment capacity and SLM lifetime. Many lab studies on SLM could demonstrate metal removal efficiencies above 70% and mass transfer coefficient in the range of 10⁻⁶ m/s, but there is more variation in reported SLM stability for different setups tested. Recently, researchers started exploring the use of green chemicals in constructing SLM. In this review, factors affecting selectivity, transport kinetics, and stability of SLMs are presented. Improvement strategies for maturing SLM technique into a technology capable for treating metal-bearing wastewater on an industrial scale are discussed.

摘要

水性金属污染物的有害影响和回收利用的好处推动了对废水处理和回收金属再利用的需求。支持液膜 (SLM) 分离是可以选择性回收金属离子的潜在节能技术之一，但需要提高传输速率和稳定性以提高处理能力和 SLM 寿命。许多关于 SLM 的实验室研究可以证明金属去除效率高于 70%，传质系数在 10 ^-6范围内m/s，但对于不同的测试设置，报告的 SLM 稳定性存在更多差异。最近，研究人员开始探索在构建 SLM 中使用绿色化学品。在这篇综述中，介绍了影响 SLM 的选择性、传输动力学和稳定性的因素。讨论了将 SLM 技术成熟为能够在工业规模上处理含金属废水的技术的改进策略。