scholarly journals Effects of Resin Chemistries on the Selective Removal of Industrially Relevant Metal Ions Using Wafer-Enhanced Electrodeionization

Membranes ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 45
Author(s):  
Humeyra B. Ulusoy Erol ◽  
Christa N. Hestekin ◽  
Jamie A. Hestekin

Wafer-enhanced electrodeionization (WE-EDI) is an electrically driven separations technology that occurs under the influence of an applied electric field and heavily depends on ion exchange resin chemistry. Unlike filtration processes, WE-EDI can be used to selectively remove ions even from high concentration systems. Because every excess ion transported increases the operating costs, the selective separation offered by WE-EDI can provide a more energy-efficient and cost-effective process, especially for highly concentrated salt solutions. This work reports the performance comparison of four commonly used cation exchange resins (Amberlite IR120 Na+, Amberlite IRP 69, Dowex MAC 3 H+, and Amberlite CG 50) and their influence on the current efficiency and selectivity for the removal of cations from a highly concentrated salt stream. The current efficiencies were high for all the resin types studied. Results also revealed that weak cation exchange resins favor the transport of the monovalent ion (Na+) while strong cation exchange resins either had no strong preference or preferred to transport the divalent ions (Ca2+ and Mg2+). Moreover, the strong cation exchange resins in powder form generally performed better in wafers than those in the bead form for the selective removal of divalent ions (selectivity > 1). To further understand the impact of particle size, resins in the bead form were ground into a powder. After grinding the strong cation resins displayed similar behavior (more consistent current efficiency and preference for transporting divalent ions) to the strong cation resins in powder form. This indicates the importance of resin size in the performance of wafers.

1994 ◽  
Vol 30 (9) ◽  
pp. 111-119 ◽  
Author(s):  
M. Buday

The paper deals with adsorption of ammonium ions from wastewater of ammonia and ammonium nitrate plant on cation exchange resins. The aim of the treatment was not only separation of ammonium ions but also their return to the technology of ammonium nitrate fertilizer. Therefore, it was desirable to obtain high concentration of eluate. The columns of cation exchangers were arranged in the so-called “coupled columns” technique. The results were obtained on the pilot scale (0.6 m3.h−1) and in full scale (50 −110 m3.h−1) plants. Nitric acid was used for the regeneration of the exhausted resins. Its concentration was in the range of 3.9 − 7.0 mol.1−1. The average ammonium concentration of the eluate was in the range of 0.95 − 2.35 mol.l−1. This parameter of the treatment process depended on the pH value of wastewater and on the concentration of the regenerant. The concentration of ammonium nitrate achieved in the eluate is sufficient for its utilization in the technology for the ammonium nitrate fertilizer production.


2018 ◽  
Vol 56 (1) ◽  
pp. 6-9

Hyperkalaemia is a potentially life-threatening condition, in which there is an abnormally high concentration of potassium ions in the blood.1,2 Cation-exchange resins (e.g. calcium or sodium polystyrene sulfonate) that bind potassium in the gastrointestinal tract to increase faecal elimination have been used as part of the management of hyperkalaemia but they have some serious adverse effects, including potentially fatal gastrointestinal necrosis.3,4 Patiromer (▼Veltassa – Vifor Fresenius) is a cation-exchange polymer that is licensed for the treatment of hyperkalaemia in adults and, unlike other exchange resins, its licence is not restricted to people with anuria, severe oliguria or those requiring or undergoing dialysis.5,6 Here, we review the evidence for the efficacy and safety of patiromer and consider its place in the management of hyperkalaemia.


2019 ◽  
Vol 58 (27) ◽  
pp. 11871-11877 ◽  
Author(s):  
Si Chen ◽  
Su Wang ◽  
Zheng Zhou ◽  
Gaodong Yang ◽  
Zhibing Zhang

Sign in / Sign up

Export Citation Format

Share Document