Patent ID: 8119008

Claim:
A method of fluid purification comprising: a. processing a fluid stream by a first reverse osmosis stage to create a reverse osmosis retentate; b. electrocoagulation treatment of at least a portion of the reverse osmosis retentate to an electric field to create a purified retentate; c. after the electrocoagulation treatment, contacting the purified retentate with a polymer capable of promoting coagulation of sparingly-soluble compounds; d. after the exposing, first injecting a first oxidizing agent selected from the group consisting of ozone, chlorine, potassium permanganate and combinations thereof, into the purified retentate; e. after the contacting and first injecting, holding the purified retentate in a tank to allow settling of solid particles; f. after the holding, first filtering the purified retentate with a first filtration treatment selected from the group consisting of ultrafiltration and microfiltration; g. after the first filtering, second injecting a second oxidizing agent selected from the group consisting of ozone, chlorine, potassium permanganate and combinations thereof, into the purified retentate; h. after the second injecting, third filtering the purified retentate with a multimedia filtration treatment selected from the group consisting of manganese dioxide filtration, KDF filtration, calcite filtration, magnesium hydroxide filtration, carbon filtration and combinations of these filtration treatments; i. after the third filtering, fourth filtering the purified retentate with a second filtration treatment selected from the group consisting of cartridge filtration, ultrafiltration and microfiltration; and, j. after the fourth filtering, processing at least a portion of the purified retentate by a second reverse osmosis stage to create a purified fluid.