Abstract
The report is concerned with the design and synthesis of a mixed bead resin for high salt level desalination. The resin allows for the simultaneous exchange of both anions and cations, within the same polymer. This improves the efficiency of desalination at seawater levels. A novel process for sustainable and low energy desalination for brackish water has already been achieved via ion exchange resins as explained below. The advance in resin technology improves a novel membrane process with closed–cycle regeneration of the resin. It is a superior alternative to reverse osmosis.
Highlights
Current desalination techniques like distillation and reverse osmosis (RO) are so energy intensive processes that they are often marginal economically.[1]
Cross-linked polyampholytic resins were synthesised within the glass tubes using the one-step copolymerisation of an anionic monomer, a cationic monomer and a crosslink agent (EGDMA). 2-oxoglutaric acid was used as initiator
Both resins indicate enhanced adsorption capacity compared with typical results obtained using commercial mixedbed strong acid-strong base systems
Summary
Current desalination techniques like distillation and reverse osmosis (RO) are so energy intensive processes that they are often marginal economically.[1] A promising alternative discussed in this volume comprises mixed cation and anion ion-exchange resins, that remove salt. It offers several advantages in desalination, such as low-input pressure, simple setup, high efficiency and does not require an extensive pre-treatment. An ion-exchange resin reaches a ‘spent’ point, at which the majority of the ion-receiver sites on the surface of the beads are depleted and no longer adsorb ions in aqueous solution This problem can be resolved by maintaining separation of cationic and anionic beads following by regeneration of each with large volumes of strong acid and strong base. This limits the economic viability of the technique for desalination applications.[2,5]
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