SYSTEM AND METHOD FOR TREATMENT OF ACID SEWAGE WATERS Russian patent published in 2008 - IPC C02F1/44 C02F1/66 C02F1/52 C02F1/58 C02F1/60 C02F9/00 

FIELD: technological processes; water treatment.

SUBSTANCE: invention is related to treatment of acid industrial sewage waters. Method for fluorides removal from outlet flow of sewage waters includes establishment of initial value of pH of supplied flow at the level below than approximately 3.5 or maintenance of supplied flow pH at the level of below than approximately 3.5. Then sewage waters are sent in the first system of reverse osmosis, and part of fluorides are removed from sewage waters. Sewage waters pH are maintained at the level below than approximately 3.5 at least until treatment goes on in the first system of reverse osmosis. Then sewage waters from the first system of reverse osmosis are sent to the second system of reverse osmosis, and fluorides are removed from sewage waters. After treatment in the first system of reverse osmosis high pH is established. At least 90% of fluorides are removed from sewage waters as a result of using of the first and second systems of reverse osmosis.

EFFECT: removal the most part of fluorides from sewage waters.

25 cl, 6 dwg, 2 tbl, 1 ex