Experimental study on the treatment of chemical nickel plating wastewater by improved sulfide precipitation method
Chemical nickel plating wastewater contains nickel(Ⅱ)ions in the complexed state,and its effective treatment is crucial for chemical nickel plating enterprises to meet the wastewater discharge standards.In this study,the improved sulfide precipitation method was used to treat the nickel plating wastewater containing complexed nickel(Ⅱ)ions,and the effects of sulfide dosage,coagulant dosage and final pH of the wastewater on the treatment performance were investigated.The results showed that at room temperature with the dosage of Na2S·9H2O(mass concentration of 10.0 g/L)of 4.8 mL/L,the dosage of Al2(SO4)3·18H2O(mass concentration of 4 g/L)of 5.7 mL/L,and the final pH of the wastewater of 7.0,the mass concentration of nickel(Ⅱ)in the effluent was 0.27 mg/L,which meets the requirements of Table 2 limits(<0.5 mg/L)in the"Electroplating Pollutant Emission Standards"(GB21900-2008).
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