Millipore Corporation

Ramesh S Hegde

Gary C Ganzi

Jacques Moulin

Ven Anantha Raman

An electrodeionization (EDI) module is formed from an anode spaced apart from a cathode, one or more waste channels formed between the electrodes and a product channel located inward of the waste channel(s). Ion permeable membranes form the boundary between the product channel and the waste channel(s). The product channel and waste channels are filled with a mixture of anionic and cationic ion exchange materials. At least the waste channel(s) and preferably the product channel as well, use either an anion bead having a relatively low affinity for the selected anion specie(s) to be retained (e.g. Type II) or it is a blend with Type I materials. Preferably, the membranes contain an ion exchange material to speed the transfer of ions across them. More preferably, the anionic membrane contains anion materials that have a relatively low affinity for the selected specie or species for retention.

Electrodeionization module

A water treatment cartridge and method for producing ultrapure water is described. The cartridge comprises a container having therein a particulate admixture of activated carbon and mixed bed ion exchange resins. A source of water, preferably pretreated, is passed through the container, preferably following treatment by one or more cartridges containing mixed bed ion exchange resins. The carbon in the admixed cartridge removes residual organic contamination from the water and the resins remove ionic contamination from the carbon, without re-introducing organic material to the water.

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Chelmsford, MA, United States of America

Ramesh S Hegde