MemBrain s. r. o. (Membrane Innovation Centre), Pod Vinicí 87, 471 27 Stráž pod Ralskem, Czech Republic.
Institute for Nanomaterials, Advanced Technologies and Innovation, Technical University of Liberec, Studentská 2, 461 17 Liberec, Czech Republic.
Int J Mol Sci. 2022 Jun 1;23(11):6212. doi: 10.3390/ijms23116212.
In the present study, the possibility of using a spiral-wound diffusion dialysis module was studied for the separation of hydrochloric acid and Zn2+, Ni2+, Cr3+, and Fe2+ salts. Diffusion dialysis recovered 68% of free HCl from the spent pickling solution contaminated with heavy-metal-ion salts. A higher volumetric flowrate of the stripping medium recovered a more significant portion of free acid, namely, 77%. Transition metals (Fe, Ni, Cr) apart from Zn were rejected by >85%. Low retention of Zn (35%) relates to the diffusion of negatively charged chloro complexes through the anion-exchange membrane. The mechanical and transport properties of dialysis FAD-PET membrane under accelerated degradation conditions was investigated. Long-term tests coupled with the economic study have verified that diffusion dialysis is a suitable method for the treatment of spent acids, the salts of which are well soluble in water. Calculations predict significant annual OPEX savings, approximately up to 58%, favouring diffusion dialysis for implementation into wastewater management.
在本研究中，研究了使用螺旋缠绕扩散透析模块分离盐酸以及 Zn2+、Ni2+、Cr3+和 Fe2+盐的可能性。扩散透析从含有重金属离子盐的废酸洗溶液中回收了 68%的游离 HCl。较高的透析液体积流速回收了更多的游离酸，即 77%。除 Zn 之外的过渡金属（Fe、Ni、Cr）被排斥超过 85%。Zn 的低保留率（35%）与带负电荷的氯络合物通过阴离子交换膜的扩散有关。在加速降解条件下研究了扩散透析 FAD-PET 膜的机械和传输性能。长期测试与经济研究相结合，验证了扩散透析是处理废酸的一种合适方法，因为废酸中的盐在水中有很好的溶解性。计算预测了显著的年度 OPEX 节省，约高达 58%，有利于扩散透析在废水管理中的实施。
