Fundamental Principles and Concepts of Ion Exchange (original) (raw)

Critical Review Wastewater treatment by ion exchange method: a review of past and recent researches

Ion exchange is an exchange of ions between two electrolytes or between an electrolyte solution and a complex. Ion exchange can be a process of purification, separation and decontamination of aqueous or ion containing solutions. Ion exchange resins are used in wastewater treatment process plants to interchange one ion with another to fulfill the purpose of demineralization. In this assignment, we look at the working principle, equipment design, advantages and disadvantages, and industrial applications of ion exchange as a water pollution remediation technique.

Application of Modern Research Methods for the Physicochemical Characterization of Ion Exchangers

Materials

Ion exchange technique as the reversible exchange of ions between the substrate and the surrounding medium can be an effective way of removing traces of ion impurities from the waters and wastewaters and obtaining a product of ultrapure quality. Therefore, it can be used in analytical chemistry, hydrometallurgy, purification and separation of metal ions, radioisotopes and organic compounds, and it also finds great application in water treatment and pollution control. In the presented paper, the new trends for ion exchanger characteristics determination and application are presented. Special attention is paid to the ion exchangers with multifunctionality for heavy metal ions removal. They show superior actions such as sorption capacity values with excellent resistance to fouling and the possibility of application in the co-current or modern packed bed counter-current systems, as well as for the condensate polishing or the conventional mixed bed systems in combination with other resin...

Ion Exchange Fundamentals and New Challenges

Mass Transfer - Advancement in Process Modelling, 2015

Ion exchange is a stoichiometric phenomenon commonly used in water treatment as an end-of-pipe technique. Such process is highly influenced by mass transfer conditions and may be modeled by adsorption equations. Although widely applied in industries its theory has not been completely understood and depends on the exchanger characteristics. Moreover, competitive systems may add complexity and decrease removal efficiency and exchanger selectivity mainly in dynamic systems. In this chapter some general theory was presented and some detailed examples involving alginate biopolymer, bonechar and zeolite in single and competitive systems were discussed in batch and continuous state.

Waste water recycling by ion-exchange: I. Complete desalination

Desalination, 1980

Recycling of waste water by ion-exchange was studied on a bench scale. Secondary municipal effluent, which had undergone lime flocculation, served as a feed for the ion-exchange system. It was found that both the salt concentration and the organic matter content of the effluent could be reduced to produce high quality water, suitable for a wide range of agricultural and industrial applications. Salt concentrations was reduced from 15 meq/l (750 ppm as CaCO, ) to about 1 meq/l (50 ppm as CaCOs ) and the organic matter, from 70-100 mg/l COD (chemical oxygen demand) to 20 mg/l. The anion exchanger was regenerated with Ca(OH), according to a new method recently developed. The treatment cost for a 2000 m3/day plant was calculated to be 18.0 t/m3. 124 Y. EGOZY, E. KORNGOLD AND N.C. DALTROPHE resources are being utilized. Consequently, the salinity level of ground water is rising steadily. The use of recycled waste water is expected to increase sharply [l] . In the course of the intensive use of fresh water sources and its recycling, there is a salinity buildup in the water sonrces. It is, therefore, necessary to control and reduce this process by incorporating a salinity removal stage in the system. The combination of waste water treatment and salinity removal in a one-process system would be most economical.

Ion Exchange: Science and Technology

Chemical Engineering Science, 1987

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Use of Experimental Breakthrough Curves for Ion Exchange Process Optimization

2006

− H RC ), cealaltă cu anionit puternic bazic ( − + HO R A ). Studiul efectuat a avut ca obiectiv utilizarea curbelor de străpungere pentru stabilirea influenţei calitative si cantitative a factorilor procesului, respectiv viteza fictivă de curgere a soluţiei, volumul total de schimbători de ioni si temperatura de operare, asupra răspunsurilor procesului, respectiv duratele adimensionale de străpungere si saturare, precum si eficienţa schimbului ionic. The paper presents a study of the total demineralization of a dilute sodium chloride aqueous solution by ion exchange using two fixed bed columns, the former filled with a strongly acidic resin ( + − H R C ) and the second with a strongly basic resin ( − + HO R A ). The study aimed at the use of breakthrough curves in establishing of a qualitative and quantitative influence of the process factors, namely solution superficial velocity, total volume of the resin beds and operating temperature, on the process responses, respectively break...

DEVELOPMENT AND APPLICATIONS OF IONTECH ION EXCHANGE (IONTIX ® ) PROCESS

The copper recovery process from copper containing solutions is described. Iontech Ion Exchange (IONTIX ® ) process is very effective for treatment of copper pregnant leach solutions (PLS), acid mine drainage (AMD) and other process streams with metal concentrations varying on a broad range. Regeneration is very efficient and the target metal is usually recovered in relatively small volumes of regenerate solution. The rinse waters from regeneration are recycled through the system and used for preparing of regeneration solutions for the next cycle.