Experimental study on treatment of electroplating wastewater with ion flotation
- Received Date: 07/12/2009
- Accepted Date: 27/10/2009
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Key words:
- electroplating wastewater /
- ion froth flotation /
- heavy metal ions /
- resources reclamation
Abstract: In this study, ion flotation method was used to dispose the electroplating wastewater. The effects of pH value, the ratio of CA∶CMe,ion strength, flotation time, volume of aeration on the treatment of the electroplating wastewater were studied. Experimental results showed that the decreasing order to separate the ions was Cd2+>Zn2+>Fe2+>Cu2+>Ni2+. The preferential segregation for the cadmium, zinc, copper, nickel was that the ratio of CA∶CMe was 2.5～3.1, pH value was 8.5～9, and the ion strength was less than 0.0001 mol/L. In this case, the residual concentrations of the Cd2+, Zn2+, Fe2+, Ni2+ and Cu2+ were 0.05, 0.20, 0.22,0.28 and 0.33 mg/L, respectively. After electroplating wastewater were disposed, the pollutant concentration complied with the discharge standard. The concentrations of the chromium, copper and nickel in the disposal froth product were 3.2％,9.3%,18.1% and 13.2%, respectively, which showed that there was a great reclamation value.
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