中和共沉淀—铁氧体法处理含镍、铬废水的实验研究

Study on the treatment of containing nickel and chromium wastewater by neutral coprecipitation/ferrite process

利用中和共沉淀—铁氧体法处理甘肃某稀有金属生产企业产生的含镍、铬废水,同时对该废水的处理工艺条件进行了实验研究。经测定,废水中Ni 2+质量浓度为50mg/L,Cr(Ⅲ)质量浓度为87mg/L。通过实验得到处理工艺的最佳条件:投料摩尔比(Fe2+/(Ni 2++Cr2O2-7))为9,pH=9,温度为70℃。出水中镍、铬均可达到《污水综合排放标准》(GB 8978—1996)中第一类污染物最高允许排放浓度的要求,为中和共沉淀—铁氧体法处理混合重金属废水的工艺条件研究提供了参考。

The neutral coprecipitation/ferrite process experiments were processed on the nickel and chromium mixed heavy metal wastewater,which was discharged by a rare metals production company in Gansu Province of China,with its initial concentration of Ni^2＋ and Cr（Ⅲ）at 50mg/L and 87mg/L respectively.The results showed that under the optimum conditions of Fe^2＋/（Ni^2＋＋Cr2O7^2-）=9,pH=9,and temperature=70 ℃,the removal rates of nickel,chromium were the best,and the discharged wastewater could meet the national discharge standard for the first class pollutants,which is regulated in Integrated Wastewater Discharge Standard（GB 8978-1996）.The research results could provide reference in data for the neutral coprecipitation-ferrite process treating with mixed heavy metal wastewater.