METHOD FOR TREATMENT OF WASTE WATER FROM COLD ROLLING PLANT

摘要

The waste water treatment comprises (A) well mixing oil-containing waste water, alkali-containing waste water, sulfur-containing waste water, and organic substances-containing waste water ; (B) adding acid heavy metal-containing waste water to above mixture to adjust thiocyan concentration of the mixture at lower than 30 mg/l ; (C) adding sulfuric acid to adjust the pH of the mixed waste water at 6.5-8.0 ; (D) adding coagulant to the neutralized waste water to remove oil and suspensions ; and (E) biologically oxidizing, absorbing and adsorbing the treated water from (D) in an aerating tank.