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mfw553947967

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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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