化学镀镍废液中存在大量的镍离子、亚磷酸钠、次磷酸钠、pH缓冲剂及稳定剂等有机物。镍既是一种致癌的物质，也是一种短缺的昂贵的重金属资源，磷则是众所周知的引起水体富营养化现象主要污染因素之一，大量的还原剂及稳定剂使得化学镀镍废液具有高浓度的CODCr，因此，化学镀镍废液处理起来相当复杂。如何有效地处理化学镀镍废液，减少其对环境的污染和生态的破坏，有着十分重要的意义。 本文以化学镀镍废液为研究对象，主要采用化学沉淀法、芬顿氧化和化学混凝沉淀法来处理化学镀镍废液中镍、磷及CODCr。 采用化学沉淀法处理废液中的镍，选用Na2S为沉淀剂，通过Na2S投加量、反应时间、温度及pH四种因素对废液中镍去除率影响的研究。结果表明：化学镀镍废液的pH为6，温度为15℃时，投加30ml硫化钠（250g/L）溶液，反应1h后，镍的去除率可以达到99.99%，残余量为0.53mg/L，达到了国家排放标准，并可回收废液中的镍金属。 采用CaO为沉淀剂，去除化学镀镍废液中的次磷酸盐、亚磷酸盐和总磷。考察了CaO投加量、pH、反应温度及反应时间对上述三者去除效果的影响。研究表明：溶液pH为6、温度为60℃时，投加10g的CaO反应2h后，三者的去除率分别达到：99.40%、99.67%及99.98%，废液中剩余总磷的含量低于1.5mg/L，达到国家排放标准。 采用Fenton氧化法降低化学镀镍废液中的CODCr的含量，研究表明：Fenton氧化最佳工艺条件为：溶液pH为4，加入60g/L 的FeSO4•7H2O和30ml/L H2O2，在温度为30℃的条件下反应45min后，CODCr的去除效果最好，达到94.19%； Fenton氧化后废液进一步经混凝沉淀法处理，试验结果表明：混凝沉淀的最佳条件为：温度为30℃，pH为10，CODCr总的去除率为99.16%，此时废液中剩余的残量为841mg/L。

Electroless nickel plating wastewater, have lots of nickel ions, sodium phosphite, sodium hypophosphite, the pH buffer and stabilizer of organic matter. The nickel is not only a carcinogen, but also a shortage of expensive heavy metal resource. As we all know that phosphorus is a major pollution factor, which result in water eutrophication phenomena, because of there are large amount of reducing agent and stabilizer in the electroless nickel wastewater have high concentration of CODCr, therefore, electroless nickel plating wastewater treatment is quite complex. How to deal with the electroless nickel plating wastewater effectively and reduce environmental pollution and ecological destruction, which have great significance. In the paper, electroless nickel plating wastewater as the research object, mainly adopts chemical precipitation method, Fenton oxidation and chemical coagulation method to deal with nickel, phosphorus and CODCr. Chemical precipitation method to deal with the wastewater of nickel, using Na2S as the precipitating agent , through Na2S dosage, reaction time, temperature and pH of four factors on the removal rate of nickel in liquid waste. Studies have shown that: the pH was 6, and the temperature was 15℃, adding 30ml sodium sulfide solution(250g/L), one hour after the reaction, the removal rate of nickel reached 99.99%, with the residual concentration of the nickel was 0.53mg/L, reached the National Emission Standards and recovered nickel metal in the wastewater. With CaO as the precipitating agent, removal of hypophosphite, phosphite and TP in the electroless nickel plating wastewater. Investigated the effects of removal above of the three by CaO dosage, pH, reaction temperature and reaction time. Studies have shown that: the pH of the solution was 6, temperature was 60°C, and dose of CaO was 10g, after reaction for 2h, the removal rate of the three, respectively: 99.40%, 99.67% and 99.98%, and remaining TP in the wastewater was less than 1.5 mg/L, and reached the National Emission Standards. Fenton oxidation to reduce the CODCr in the electroless nickel plating wastewater, research has shown that the optimum conditions of Fenton oxidation as follows: the pH was 4, adding 60g/L FeSO4•7H2O and 30ml/L of H2O2, under the condition of the 30°C, reacting for 45min, the removal efficiency of the CODCr reached 94.19%. After Fenton oxidation wastewater futher by coagulation and sedimentation treatment, results have shown the best condition of coagulation and sedimentation was pH=10, 30°C. The total removal of the CODCr was 99.16% , and the remaining residue in wastewater was 841mg/L.