工业水处理 ›› 2025, Vol. 45 ›› Issue (7): 140-146. doi: 10.19965/j.cnki.iwt.2024-0574

• 试验研究 • 上一篇    

电化学氧化法处理低浓度氨氮废水

李鋆(), 赵国萍, 黄光法, 李佳男(), 陶怡恺, 谢诚哲   

  1. 浙江浙能科技环保集团股份有限公司,浙江 杭州 311121
  • 收稿日期:2024-12-23 出版日期:2025-07-20 发布日期:2025-07-22
  • 通讯作者: 李佳男
  • 作者简介:

    李鋆(1985— ),本科,E-mail:

  • 基金资助:
    浙江省能源集团有限公司科学技术项目(ZNKJ-2022-063)

Treatment of low-concentration ammonia wastewater by electrochemical oxidation

Jun LI(), Guoping ZHAO, Guangfa HUANG, Jia’nan LI(), Yikai TAO, Chengzhe XIE   

  1. Zhejiang Zheneng Science and Technology Environmental Protection Group Co. , Ltd. , Hangzhou 311121, China
  • Received:2024-12-23 Online:2025-07-20 Published:2025-07-22
  • Contact: Jia’nan LI

摘要:

设计了一种旋转阴极电化学处理装置,内部设置有过流式板式电极组,由10片DSA阳极(Ti/RuO2-IrO2)和11片钛板阴极交替排列组成,将该装置应用于氨氮废水处理,并对电化学处理装置制氯效率、去除氨氮的影响因素及能耗进行了研究。结果表明:该电化学装置处理氨氮的最佳反应条件为pH 9左右、电流密度25 mA/cm2、停留时间3 min;当废水中COD与氨氮共存时,电化学装置对氨氮的氧化效果一定程度上被抑制。最后以某厂内两种实际废水为试验对象,在最佳工艺条件下考察了电化学处理装置的运行效果,氨氮去除率分别为93.0%和94.5%,去除1 kg氨氮的能耗分别为70.75、83.20 kW·h,运行费用分别为28.30、33.28元,对比折点加氯方法能够节省运行费用50.9%~58.3%。

关键词: 氨氮, 电化学, 氧化法, 氯离子

Abstract:

An electrochemical treatment device with rotating cathodes was designed for ammonia nitrogen wastewater treatment. This device was equipped with a through-flow plate electrode set, which was composed of 10 pieces of DSA anode (Ti/RuO2-IrO2) and 11 pieces of titanium plate cathodes arranged alternately. The chlorine production efficiency, ammonia nitrogen removal influencing factors, and energy consumption were systematically investigated. The results demonstrated that the optimal operating conditions were pH of approximately 9, current density of 25 mA/cm2, and residence time of 3 min. However, the coexistence of COD and ammonia nitrogen in wastewater moderately suppressed the ammonia nitrogen oxidation efficiency. Practical verification using two industrial wastewater samples from a manufacturing plant under optimal conditions showed ammonia nitrogen removal rates of 93.0% and 94.5%, respectively. Meanwhile,the energy consumption for 1 kg ammonia nitrogen removal was 70.75 and 83.20 kW·h, corresponding to operating costs of 28.30 and 33.28 RMB. Compared with the breakpoint chlorination method, this electrochemical technology achieved significant operating cost savings of approximately 50.9%-58.3%.

Key words: ammonia nitrogen, electrochemical method, oxidation treatment, chloride ion

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