Patent ID: 7335309
Filing Date: 2008-02-26
Classification: C02F,Y10S

Abstract:
1. A method for removing metal compounds comprising copper metal compounds from waste water comprising the steps of: (a) adjusting the pH of the waste water to from about 5 to about 12; (b) aerating the waste water; (c) agitating the waste water, where steps (a), (b) and (c) are carried out simultaneously in a reaction tank and waste water is aerated in said reaction tank to provide a dissolved oxygen concentration of from about 0.01 lb./hr. to about 70 lb./hr. at a waste water input flow rate of from about 50 gal./min. to about 500 gal./min. for a metals concentration of from about 50 mg./L to about 1,000 mg./L; (d) then adding a flocculating agent polymer selected from a group consisting of cationic and anionic polymers to the water and allowing floccules including said metal compounds to form; (e) then separating said floccules including said metal compounds from the water by means of a clarifier and adding additional flocculating agent polymer to said separated metal compounds; and (f) then further dewatering the floccules separated in step (e) in a belt filter press.