Waste water from the tank is pumped up hot response made of cotton. Here, additional pump dd FeSO4 to reduction of Cr6 + very monopolize the Cr3 + is less toxic. Then remove the Cr3 + and Cu2 + by precipitating with NaOH at pH = 8.5 ÷ 9, the metal hydroxide formed precipitate. Copper and chromium waste water after the reaction developed glue to settle over a period of 30-45 minutes. Residue after sedimentation of reservoirs of mud, water in the exhaust is discharged sewage water of INDUSTRIAL ZONES.
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