次氯酸钠氧化脱除化学镀镍废水中的氨氮
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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.
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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[2] 张洪亮,王棉棉,吕斯濠,等. Fenton氧化-沸石吸附联合处理化学镀镍废水[J]. 电镀与环保,2017,37(6):61-65.
[3] 刘洋. 化学镀镍废水中污染物去除工艺的研究[D].广州:华南理工大学,2015.
[4] 王刚,张路路,尹倩婷,等. 广东省电镀废水处理技术现状与达标分析[J]. 电镀与涂饰,2014,33(20):891-895.
[5] 刘富强,朱兆华,邓华利.硫化钠沉淀法处理化学镀镍废液[J].环境工程,2008,26(1):142-143,155.
[6] 戎馨亚. 化学镀镍废液的处理及资源回收利用[D].苏州:苏州大学,2005.
[7] 顾庆龙. 次氯酸钠氧化法脱除二级生化出水中氨氮的中试研究[J]. 环境科学与管理,2007(12):97-99,147.
[8] 张胜利,刘丹,曹臣. 次氯酸钠氧化脱除废水中氨氮的研究[J]. 工业用水与废水,2009,40(3):23-26.
[9] 胡小兵,赵鑫,刘孔辉,等. 次氯酸钠氧化法去除电镀废水中的氨氮[J]. 电镀与涂饰,2014,33(5):214-216.
[10] 黄海明,肖贤明,晏波. 折点氯化处理低浓度氨氮废水[J]. 水处理技术,2008(8):63-65,78.
[11] 王昶,黄志金,左军,等. 次氯酸钠氧化脱除河水低浓度氨氮研究[J]. 中国市政工程,2013(2):39-42,107.
[12] 施光明,张品三,邢绍然. 用次氯酸钠降低ADC发泡剂废水中氨氮的探讨[J]. 氯碱工业,2006(11):35-36.
[13] 尹子洋,颜幼平,姚兴,等. 化学混凝-Fe2+/NaClO处理石化废水的实验研究[J]. 广东化工,2014,41(1):5-6.
[14] 余华东,徐伟,黄聪聪,等.次氯酸钠处理电镀废水中氨氮及其ORP控制方式的研究[J].工业用水与废水,2017,48(5):15-18,40.
[15] 周相武,汪晓军,刘姣,等. 次氯酸钠溶液的氧化性研究[J]. 氯碱工业,2006(8):28-30.
[16] Droste,Ronald L. Theory and practice of water and wastewater treatment[M].New York, J Wiley,1997:44.
[17] Benefield L D,Judkins J F,Weand B L.Process chemistry for water and wastewater treatment[M].New Jersey:Prentice—Hall.Englewood Cliffs,1982:102.