Electrodialysis system and process

A fluid treatment line for performing a continuous treatment of a flow of fluid, wherein the treatment line comprises:

• a plurality of electrodialysis treatment units, said treatment units being configured for connection so as to receive a feed flow of feed fluid that is to be treated, and so as to receive a flow of concentrate fluid that is to receive material removed from the feed flow during treatment in said treatment units, each treatment unit being electrically connectable to ionically transfer said material from the flow of feed fluid into the flow of concentrate fluid;
• a plurality of fluid connections interconnecting said treatment units in stages along the treatment line such that feed fluid proceeds sequentially from a first stage to one or more later stages, and concentrate fluid proceeds in an opposite sense from a later stage to one or more earlier stages of the treatment line;
• said fluid treatment line further comprising at least one pump operative to control the flow of said feed fluid and said concentrate fluid through said stages, said stages further comprising a detector operative to sense a characteristic of said feed fluid and said concentrate fluid in said stages;
• said fluid treatment line further comprising a controller responsive to said detector for controlling said at least one pump to effectively match a characteristic of said feed fluid and said concentrate fluid in said stages.