Patent ID: 7438817
Filing Date: 2008-10-21
Classification: B01D,C02F

Abstract:
1. A method of removing contaminants from an influent wastewater stream, the method comprising: a. initially chemically adjusting a pH of the influent wastewater stream to less than about 3.5 or maintaining the pH of the influent stream at less than about 3.5; b. after initially adjusting or maintaining the pH of the influent wastewater stream, directing the wastewater to a first reverse osmosis system and removing contaminants from the wastewater; c. directing the wastewater from the first reverse osmosis system to a second reverse osmosis system and removing contaminants from the wastewater; d. adjusting the pH upwardly after the wastewater has been subjected to treatment in the first reverse osmosis system and prior to treatment in the second reverse osmosis system; and e. directing the influent wastewater stream through a ballasted flocculation system disposed upstream from the first reverse osmosis system.