Electroplating wastewater zero-discharge or low-discharge handling method
A technology of electroplating wastewater and treatment methods, which is applied in the directions of heating water/sewage treatment, adsorption water/sewage treatment, light water/sewage treatment, etc., and can solve the problem that most or all of the water cannot be reused, and effective separation and recovery cannot be performed. And other issues
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[0072] Example 1:
[0073] A large electroplating company produces about 700 cubic meters of wastewater every day. The wastewater is classified into three groups. The first wastewater is pickling wastewater. The total amount is 200 cubic meters per day. The main components are: iron 362mg / l, pH value 2.9, Total dissolved solids are 2200mg / L, fats and oils are 332mg / L, calcium and magnesium are 446mg / L, and total chlorine is 917mg / L. The second line of wastewater is cyanide-containing wastewater, with a total volume of 200 cubic meters per day and the composition: CN - 60mg / L, copper 6.1mg / L, zinc 117mg / L, iron 0.1mg / L, pH8.6. The third wastewater is electroplating mixed wastewater and passivation wastewater. The total amount is 300 cubic meters / day. The composition is: total chromium 73.6mg / L, hexavalent chromium 59.8mg / L, copper 11.34mg / L, nickel 34.5mg / L , Zinc 64.6mg / L, iron 6.1mg / L, CN - 10 mg / L, pH1.8.
[0074] Figure 1 is the process flow of this embodiment, and the processi...
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