Integrated electro-pressure membrane deionization system

A method of electrodialysis and pressure driven filtration treatment of contaminated feed liquids comprising the steps of:

• pretreating by filtration of contaminated feed liquids having inorganic contaminants and organic contaminants mixed therein, wherein said pretreating step removes particulates and generates pretreated filtrate liquids;
• channeling said pretreated filtrate liquids to a mixing unit for blending with additional liquids;
• directing said mixed pretreated filtrate liquids through a nanofiltration or reverse osmosis membrane unit providing pressure induced liquid transfer across permeable membranes thereby generating a permeate liquid stream and a concentrated reject liquid;
• deionizing said blended filtrate liquids by pumping through a multiple flow path electrodialysis unit, said step of electrically treating producing a partially deionized diluate liquid portion channeled to a storage unit, and further producing a concentrate liquid portion directed for exiting said electrodialysis unit;
• channeling said partially deionized diluate liquid portion from the electrodialysis unit for mixing in said mixing unit with said pretreated filtrate liquids;
• and
• redirecting said concentrated reject liquid from said nanofiltration or reverse osmosis membrane for mixing in said mixing unit with said partially deionized diluate liquid portion wherein said liquids blended in the mixing unit are the concentrate and deionized diluate.

A membrane-based process for treating contaminated feed liquids, comprising the steps of:

• providing contaminated feed liquids having a plurality of insoluble and soluble contaminants and ionic constituents therein;
• removing insoluble insoluble contaminants from said contaminated feed liquids in a pretreatment filtration unit for generating a pretreated filtrate liquid;
• channeling said pretreated filtrate liquid to a mixing unit for blending thereby forming a blended filtrate liquid;
• substantially simultaneously transferring an independently controlled selected flow of said blended filtrate liquid to an electric-driven membranes unit and an independently controlled selected flow of said blended filtrate liquid to a nanofiltration or reverse osmosis unit, thereby substantially simultaneously separating ionic constituents and producing a diluate in said blended filtrate liquid during passage through said electric-driven membrane unit and forming a separated ionic concentrate during passage of said selected flow through said nanofiltration or reverse osmosis unit;
• substantially simultaneously continuously redirecting flow of diluate from said electric-driven unit and a selected flow of said concentrate stream from said nanofiltration or reverse osmosis unit to said mixing unit for additionally blending and further treatment within said nanofiltration or reverse osmosis unit and within said electric-driven ionic separation unit;
• and removing deionized product liquid from sand nanofiltration or reverse osmosis unit for reused.