破络-Fenton法处理化学镀镍废水并回收水中的磷酸盐

以电镀厂化学镀镍的混合清洗水为处理对象，采用CaO破络吸附联合Fenton氧化的多级物化技术去除废液中的镍离子和磷酸盐，研究CaO投加量和反应时间对镍离子去除效率的影响以及Fenton试剂投加量、反应初始pH对废液中磷处理效果的影响。结果表明，通过两段式反应，当CaO投加量为2 g·L-1、反应时间1 h；反应初始pH为4、H2O2投加量9.18 mg·L-1、m（H2O2）/m（Fe2+）为5：1、反应时间180 min时，镍离子和总磷（TP）含量由原来的64.6和90.2 mg·L-1分别降低至0.43和0.46 mgl·L-1，均达到国家《污水综合排放标准》（GB 8978-1996）。处理后沉淀物经测试符合Fe2（PO4）3晶体及其形貌特征，达到了资源回收的目的。

Combined complex-breaking and Fenton oxidation for electroless nickel plating wastewater and reclamation of phosphate

Electroless nickel plating wastewater was treated by calcium oxide precipitation and Fenton oxidation in order to remove Ni2+ and phosphate. The effect of CaO dosage and precipitation time on the removal efficiency of Ni2+ were studied, and the effects of Fenton dosage and pH on phosphate removal were also investigated. The results showed that Ni2+ and TP in wastewater decreased from 64.6 and 90.2 mg·L-1 to 0.43 and 0.46 mg·L-1, respectively, by combining the CaO precipitation and Fenton oxidation process. The optimal CaO dosage and reaction time were 2 g·L-1 and 1 h for precipitation and the optimal H2O2 dosage and m(H2O2)/m(Fe2+) were 9.18 mg·L-1 and 5:1 (mass ratio), respectively. The treated effluent meets the criteria of the Integrated Wastewater Discharge Standard (GB 8978-1996) of China. Moreover, the sediment formed after the Fenton reaction was characterized and determined to be Fe2(PO4)3, which would realize the goal of resource reutilization.