A new approach to chromium concentration from salt mixture solution using nanofiltration

作者：Religa P^*; Kowalik A; Gierycz P

来源：Separation and Purification Technology, 2011, 82: 114-120.

DOI：10.1016/j.seppur.2011.08.032

• Nanofiltration (NF)
• Chromium concentration
• Permeate recirculation

The possibility of increasing of chloride ions in permeate, with keeping high chromium(III) retention, during nanofiltration of salt mixture solution characterized by very low pH has been investigated. An influence of the initial chlorides concentration and the relationship between chlorides and sulfates concentration on permeate composition and chromium(III) concentration factor was analyzed. Based on the obtained results the initial chlorides (on level 12-16 gCl(-)/dm(3)) and sulfates concentration as well as cl(-)/SO(4)(2-) ratio (below 1) in the feed has been determined. The obtained results allowed to offer the new approach to nanofiltration of chromium tannery wastewater by the recirculation of part of permeate for obtaining the optimum feed composition. In this way the conducted nanofiltration of chromium tannery wastewater will enable the direct reuse of both retentate - recovered tanning bath (high concentration of chromium) and permeate - recovered pickling bath (high concentration of chloride ions).

• 出版日期2011-10-27