POLYMER-BOUND ACTIVE CHLORINE - DISINFECTION OF WATER IN A FLOW SYSTEM - POLYMER SUPPORTED REAGENTS .5.

Resins were prepared by reaction of sulfochlorinated, macroporous styrene-divinylbenzene copolymer, >15% DVB, with excess α,ω-alkanediamines or methylamine in aqueous solution. The resulting polymers having N-alkylarenesulfonamide functional groups were chlorinated by using hypochlorous acid to form N-chloro-N-alkylarenesulfonamide functional groups. Water containing E. coli at concentrations of 105-108colonies/100 mL was pumped through beds of the N-chlorinated resins at low pressure drops and residence times on the order of minutes. Up to 175 L of water could be treated by 30 g of resin with more than 99.8% of the E. coli being killed. The activity can be restored by rechlorination, and up to 2500 bed volumes of feed can be disinfected per cycle. The stability of the resins made with α,ω-diamines is enhanced because most of the nitrogen is combined in sulfonamide groups at both ends of the diamine, providing enhanced cross-linkage. This allows for more regenerations with chlorine over the life of the resin. © 1990, American Chemical Society. All rights reserved.