Water quality analysis on alkaline complexed zinc- and nickel-containing wastewater
[Introduction] The water quality characteristics of alkaline complexed zinc- and nickel-containing wastewater was studied in this paper. [Method] The characteristics of pollutant indicators of alkaline complexed zinc- and nickel-containing wastewater from electroplating parks in different regions of China were studied. The linear correlations between different indicators were analyzed. [Result] The pH values of all the wastewater samples were higher than 11.0. The concentrations of nickel and zinc ions were quite different. Most of nickel ions were in complexed state while only some of zinc ions were in complexed state. The nitrogen in the alkaline complexed zinc- and nickel-containing wastewater was mainly in the form of organic nitrogen. The total nickel concentration did not have a significant linear correlation with the COD (chemical oxygen demand), total nitrogen concentration, organic nitrogen concentration, or conductivity for alkaline complexed zinc- and nickel-containing wastewater. [Conclusion] Alkaline complexed zinc- and nickel-containing wastewater features high pH and conductivity, which is suitable to be treated by combination of electrochemical oxidation and decomplexing.
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