USE OF MAGNETIC ION EXCHANGE TO IMPROVE DOC-REMOVAL
Problems associated with the amount of dissolved organic carbon (DOC) in drinking water treatment are very common. They range from the very obvious ones like treated water taste and odour and appearance, to the less understood disinfection by-product formation, bacterial regrowth in distribution network, exhaustion of activated
carbon, membrane fouling and increased coagulation chemical demand. Ion exchange resins are known to be a very effective way of removing a reange of water contaminants, however high capital costs, scale-up issues and – resin fouling have limited the number of drinking water treatment applications. The magnetic ion exchange resin process (MIEX®1) is one way to try solve these problems. In this paper the principle of MIEX®-
process is introduced. Also results are presented of lab scale evaluations of MIEX®-process on two ground and one surface water from Finland. With all three waters the use of MIEX® pre-treatment resulted with a significantly improved final water quality as well as in a considerable decrease in the downstream coagulant requirements.