Blöcher C, Dorda J, Mavrov V, Chmiel H, Lazaridis N K, Matis K A
Institute for Environmentally Compatible Process Technology (upt) Ltd, Im Stadtwald Geb 47, D-66123 Saarbrücken, Germany.
Water Res. 2003 Sep;37(16):4018-26. doi: 10.1016/S0043-1354(03)00314-2.
A promising process for the removal of heavy metal ions from aqueous solutions involves bonding the metals firstly to a special bonding agent and then separating the loaded bonding agents from the wastewater stream by separation processes. For the separation stage, a new hybrid process of flotation and membrane separation has been developed in this work by integrating specially designed submerged microfiltration modules directly into a flotation reactor. This made it possible to combine the advantages of both flotation and membrane separation while overcoming the limitations. The feasibility of this hybrid process was proven using powdered synthetic zeolites as bonding agents. Stable fluxes of up to 80l m(-2)h(-1) were achieved with the ceramic flat-sheet multi-channel membranes applied at low transmembrane pressure (<100 mbar). The process was applied in lab-scale to treat wastewater from the electronics industry. All toxic metals in question, namely copper, nickel and zinc, were reduced from initial concentrations of 474, 3.3 and 167mg x l(-1), respectively, to below 0.05 mg x l(-1), consistently meeting the discharge limits.
一种从水溶液中去除重金属离子的很有前景的方法，首先是将金属与一种特殊的结合剂结合，然后通过分离工艺从废水流中分离出负载有金属的结合剂。在分离阶段，通过将专门设计的浸没式微滤模块直接集成到浮选反应器中，在本研究中开发了一种新的浮选与膜分离的混合工艺。这使得在克服局限性的同时，能够结合浮选和膜分离两者的优点。使用粉末状合成沸石作为结合剂，证明了这种混合工艺的可行性。在低跨膜压力（<100毫巴）下应用陶瓷平板多通道膜，实现了高达80l m(-2)h(-1)的稳定通量。该工艺在实验室规模上用于处理电子工业废水。所有相关的有毒金属，即铜、镍和锌，分别从初始浓度474、3.3和167mg x l(-1)降低到0.05mg x l(-1)以下，始终符合排放限值。
