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Gellike ion-exchange materials made using polystyrene as a basic component (AB-17-8) decrease to some extent the concentration of organic compounds in the water being treated, but they themselves are ¡°poisoned¡± by these compounds. This is manifested in the working capacity dropping, the quality of filtrate deteriorating, and the consumption of water for washing increasing. Anionites having macroporous and isoporous structures feature a higher capacity with respect to organic contaminants and resistance to ¡°poisoning.¡± Sequential treatment of water with weakly and strongly alkaline anionites, e.g., JRA-67 and JRA-900, allows as much as 80¨C90% of organic matter to be removed. However, this technology requires a large consumption of alkali, because 30% of the spent regeneration solution for the secondstage anionite filter has to be discharged; it involves periodic recovery-cleaning operations carried out using salt and salt-alkaline solutions, and the relevant operating conditions need to be individually adjusted [2]. |
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