工业水处理 ›› 2022, Vol. 42 ›› Issue (4): 113-118. doi: 10.19965/j.cnki.iwt.2021-0766

• 试验研究 • 上一篇    下一篇

电催化氧化深度处理污水厂二级出水中试研究

李诚1(), 张浩2, 顾悦1, 王少坡2,3()   

  1. 1. 天津市华博水务有限公司, 天津 300040
    2. 天津城建大学环境与市政工程学院, 天津 300384
    3. 天津市水质科学与技术重点实验室, 天津 300384
  • 收稿日期:2022-02-04 出版日期:2022-04-20 发布日期:2022-06-07
  • 作者简介:

    李诚(1983— ),高级工程师,E-mail:

    王少坡,教授,E-mail:

Pilot-scale study on advanced treatment of secondary effluent from wastewater treatment plant by electrocatalytic oxidation

Cheng LI1(), Hao ZHANG2, Yue GU1, Shaopo WANG2,3()   

  1. 1. Tianjin Huabo Water Works Co. ,Ltd. ,Tianjin 300040,China
    2. School of Environmental and Municipal Engineering,Tianjin Chengjian University,Tianjin 300384,China
    3. Tianjin Key Laboratory of Aquatic Science and Technology,Tianjin 300384,China
  • Received:2022-02-04 Online:2022-04-20 Published:2022-06-07

摘要:

为确定电催化氧化对污水厂二级出水的处理效果及优化运行参数,采用连续流反应器,以天津市某污水厂二级出水为原水,通过单因素实验考察了极板类型、极板数量、电流密度、极板间距、水力停留时间对COD、氨氮、总氮去除效果的影响。结果表明:对于COD和氨氮的去除,钌钛电极的去除效果优于钌铱电极;增加极板数量可以强化有机污染物的去除率。采用钌钛电极的优化运行参数:电流密度10 mA/cm2,极板间距8 cm,水力停留时间2.75 h;在优化条件下运行时,COD平均去除率为55.1%,氨氮平均去除率为99.6%,总氮平均去除率为85.9%。综合系统消耗的电费、极板损耗费及日常维护等费用,优化运行条件下吨水运行成本为10.2元。推测氨氮及COD的去除机理为活性氯与·OH的共同作用。

关键词: 电催化氧化, 二级出水, 深度处理

Abstract:

To determine the effect of electrocatalytic oxidation on secondary effluent of wastewater plants and optimize the operation parameters, a continuous flow reactor was used by using secondary effluent of a sewage in Tianjin as raw water. The effects of plate type, number of plates, current density, plate spacing, and hydraulic retention time on the removal effects of COD, ammonia nitrogen, and total nitrogen were investigated by single factor experiments. The results showed that the effect of Ti/RuO2 electrode was better than that of Ti/RuO2-IrO2 electrode for the removal of COD and ammonia nitrogen. Increasing the number of plates could enhance the removal rate of organic pollutants. The optimized operating parameters of Ti/RuO2 electrode were: current density of 10 mA/cm2, plate spacing of 8 cm, and hydraulic retention time of 2.75 h. Under the optimized conditions,the average removal rate of COD was 55.1%, average removal rate of ammonia nitrogen was 99.6%, and that of total nitrogen was 85.9%. The cost of electricity, plate loss and daily maintenance consumed by the system was ¥10.2 per ton of water under optimized operating conditions. It was speculated that the removal mechanism of ammonia nitrogen and COD was the combined action of active chlorine and ·OH.

Key words: electrocatalytic oxidation, secondary effluent, advanced treatment

中图分类号: