Patent ID: 8734645

Claim:
A water purification system for producing high purity water comprising: (a) a first ultrafiltration membrane barrier, the first ultrafiltration membrane barrier comprising at least one ultrafiltration membrane having a molecular weight cut off of no greater than about 150,000; (b) a first high intensity UV light source capable of providing UV light at a wavelength within a range from about 185 nm to about 254 nm; (c) a first pass reverse osmosis system; (d) a second pass reverse osmosis system; (e) a second high intensity UV light source capable of providing UV light at a wavelength within a range of from about 185 nm to about 254 nm; (f) a membrane degasification treatment; (g) an electrodeionization treatment; and (h) a second ultrafiltration membrane barrier, the second ultrafiltration membrane barrier comprising at least one ultrafiltration membrane having a molecular weight cut off of no greater than about 150,000; wherein elements (a) through (h) are arranged in order of flow through the water purification system with the first ultrafiltration membrane being upstream of the first high intensity UV light source, the first high intensity UV light source being upstream of the first pass reverse osmosis system, the first pass reverse osmosis system being upstream of the second pass reverse osmosis system, the second pass reverse osmosis system being upstream of the second high intensity UV light source, the second high intensity UV light source being upstream of the membrane degasification, the membrane degasification treatment being upstream of the electrodeionization treatment and the electrodeionization treatment being upstream of the second ultrafiltration membrane barrier; and wherein the water purification system is in the absence of a carbon filter.