摘要
针对化学镀镍废水氨氮浓度高、去除难度较大等特点,以预处理后的实际化学镀镍废水为试验对象,采用次氯酸钠氧化法脱除废水中的剩余氨氮。分别研究NaClO溶液投加量、反应时间、初始pH值及反应温度对氨氮去除效果的影响,得到较适宜的反应条件为:NaClO溶液投加量为1800 mg/L,反应时间为30 min,初始pH值为6.0~7.0,反应温度为10~30℃。在此条件下,废水氨氮去除率达到91%以上,剩余氨氮浓度低于15 mg/L,满足GB 21900—2008《电镀污染物排放标准》表2中对氨氮的排放限值。结果表明:次氯酸钠氧化作为深度处理方式脱除化学镀镍废水中氨氮是高效可行的。
In view of high ammonia nitrogen concentration in electroless nickel plating wastewater and treatment difficulties, NaClO oxidation method was used to remove the residual ammonia nitrogen in the wastewater, taking the pre-treated actual electroless nickel plating wastewater as the test object. The effects of the NaClO solution's dosage, reaction time, initial pH value and reaction temperature on the removal efficiency of ammonia nitrogen were studied. The results showed that the suitable reaction conditions were as follows: the dosage of NaClO solution was 1800 mg/L, the reaction time was 30 min, the initial pH was 6.0~7.0, and the reaction temperature was 10 ℃~30 ℃. Under this condition, the removal rate of ammonia nitrogen in the wastewater was over 91%, and the residual ammonia nitrogen concentration was lower than 15 mg/L, which met the requirements in Table 2 of GB 21900—2008 Emission Standard of Pollutants for Electroplating about ammonia nitrogen discharge. The results showed that NaClO oxidation, as an advanced treatment method, was highly efficient and feasible in removing ammonia nitrogen from electroless nickel plating wastewater.
引文
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