Petroleum Refinery Engineering ›› 2022, Vol. 52 ›› Issue (11): 40-44.

• PROCESSING • Previous Articles     Next Articles

Study on electrochemical removal of nitrate nitrogen by copper-nickel alloy electrode

Tan Xiangdong, Wang Xueqing, Chen Tianzuo, Zhou Tong, Liu Ya, Ma Chuanjun, Guo Hongshan, Li Baozhong   

  1. 1.SINOPEC Dalian Research Institute of Petroleum and Petrochemicals; 2.National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery
  • Received:2022-05-26 Online:2022-11-15 Published:2022-11-20

铜镍合金电极电化学脱除硝酸盐氮的研究

谭向东, 王雪清, 陈天佐, 周彤, 刘娅, 马传军, 郭宏山, 李宝忠   

  1. 1.中国石油化工股份有限公司大连石油化工研究院; 2.工业废水无害化与资源化国家工程研究中心
  • 通讯作者: 刘娅，工程师，博士。联系电话：0411-3969198,E-mail:liuya.fshy@sinopec.com。;
  • 作者简介:谭向东，工程师，博士。联系电话：0411-3969129,E-mail:hellotanxiangdong@163.com
  • 基金资助:
    中国石油化工集团有限公司资助项目(319021-5);

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Abstract:

Aiming at the difficult problem of nitrate nitrogen(NO-3—N) removal from high salinity wastewater, a three-dimensional copper-nickel alloy electrode is prepared by electrodeposition, and the influencing factors of NO-3—N removal by electrochemical technology are systematically investigated. The results show that copper-nickel alloy electrode has an excellent ability on NO-3—N removal. Increasing the cathode area can improve the removal effect of NO-3—N, and increasing the anode area is conducive to improving the selectivity of gaseous nitrogen. The 100% removal of NO-3—N could be achieved at current density of 40 mA/cm2 within 2 hours. The Na2SO4 content presented an indistinctive effect on NO-3—N removal. The presence of heteroions will inhibit the removal of NO-3—N. The cations exhibit the inhibitory effect on the total nitrogen removal rather than anions. Cl- addition is beneficial to improving the gaseous nitrogen selectivity and the optimal Cl- addition time is 15 min.

Key words: electrochemical reduction, high salinity wastewater, nitrate nitrogen, gaseous nitrogen selectivity

摘要：

针对高盐水中硝酸盐氮难脱除问题，用电沉积方法制备了三维铜镍合金电极，并系统考察了电化学脱除硝酸盐氮的影响因素。结果表明：铜镍合金电极具有良好的NO-3—N去除能力，增加阴极面积可以提升NO-3—N的去除效果，增加阳极面积则有利于提高气态氮选择性；当电流密度40 mA/cm2、时间2 h时，NO-3—N可实现100%的去除；Na2SO4浓度对NO-3—N去除影响不大，而杂离子的存在会抑制NO-3—N的去除，且阳离子对总氮去除的抑制作用明显强于阴离子；Cl-的引入增加了气态氮的选择性，且最佳投加时间为15 min。

关键词: 电化学还原, 高含盐污水, 硝酸盐氮, 气态氮选择性