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    • 9. 发明申请
    • METHOD AND APPARATUS FOR PROVIDING ULTRAPURE WATER
    • 用于提供超纯水的方法和设备
    • WO2018069674A1
    • 2018-04-19
    • PCT/GB2017/053012
    • 2017-10-05
    • VWS (UK) LIMITED
    • DENTICI, IgnazioBALL, MichaelEMERY, Nigel
    • C02F9/00C02F9/02C02F9/12C02F1/20C02F1/32C02F1/44C02F1/469C02F103/04
    • A method of providing ultrapure water from feed water containing hardness forming ions, comprising at least the steps of passing the feed water successively through: (i) providing a feed water stream containing hardness forming ions: (ii) passing the feed water stream through a reverse osmosis (RO) unit to remove at least some ionic contamination to provide a RO permeate water stream: (iii)passing the RO permeate water stream though a capacitive de-ionisation (CDI) unit to remove at least some of the ions to provide a post-CDI stream: and (iv)passing the post-CDI stream through an electrodeionisation (EDI) unit to remove at least some of the ions and carbon dioxide and to provide an ultrapure water stream for dispense or storage. In this way, the capacitive deionisation provides a wholly or substantially continuous process for removing a proportion of unwanted ions, especially the hardness forming ions, from the feed water prior to the use of electrodeionisation.
    • (i)提供包含形成硬度的离子的供给水流:(ii)提供含有形成硬度的离子的供给水流, )使进料水流通过反渗透(RO)单元以去除至少一些离子污染物以提供RO渗透水流:(iii)使RO渗透水流通过容性去离子(CDI)单元以去除 提供后CDI流的至少一些离子:和(iv)使后CDI流通过电极电离(EDI)单元以除去至少一些离子和二氧化碳并提供超纯水流供 分配或储存。 以这种方式,电容去离子化提供了完全或基本上连续的过程,以在使用电去离子之前从进料水中去除一部分不需要的离子,尤其是形成硬度的离子。