CIESC Journal ›› 2014, Vol. 65 ›› Issue (8): 3164-3169.DOI: 10.3969/j.issn.0438-1157.2014.08.043

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Biological treatment of high concentration NO2--N in passivation washing wastewater and process control strategy

DONG Yijun, WANG Shuying, ZHANG Yukun, PENG Yongzhen   

  1. Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, China
  • Received:2013-10-28 Revised:2014-02-17 Online:2014-08-05 Published:2014-08-05
  • Supported by:

    supported by the National High Technology Research and Development Program of China(2012AA063406) and the Project of Scientific Research Base and Scientific Innovation Platform of Beijing Municipal Education Commission.

高亚硝态氮钝化清洗废水的生物处理及过程控制

董怡君, 王淑莹, 张宇坤, 彭永臻   

  1. 北京工业大学北京市水质科学与水环境恢复工程重点实验室, 北京市污水脱氮除磷处理与过程控制工程技术研究中心, 北京 100124
  • 通讯作者: 王淑莹
  • 基金资助:

    国家高技术研究发展计划项目(2012AA063406);北京市教委科技创新平台项目。

Abstract: Biological treatment of high concentration NO2--N in passivation washing wastewater is difficult. In this paper nitrite oxidizing bacteria (NOB) was enriched by feeding NO2--N wastewater, NOB-rich activated sludge was used in an SBR system to treat simulated passivation washing wastewater, and a process control strategy was put forward. The results showed that using the process passivation washing wastewater with NO2--N concentration 2000 mg·L-1 could be totally oxidized within 300 min. The nitrite oxidation process was not inhibited by the high NO2--N concentration. Furthermore, this process had a correlation with the variation of DO concentration during reaction. DO-MSC, a parameter of the process control strategy, indicated the end of the reaction when it was more than 0.02. The results of batch tests showed that the DO-MSC could indicate the end of the nitrite oxidation process both in different aeration rates(0.02-0.125 m3·h-1) and different temperature(15-30℃).

Key words: wastewater, nitrite, SBR, DO-MSC, process control, aeration, temperature

摘要: 钝化清洗废水含有高浓度亚硝态氮,采用普通活性污泥难以进行生物处理。采用亚硝态氮废水富集亚硝态氮氧化菌(NOB),以富含NOB污泥的SBR装置处理模拟化学清洗钝化废水,并提出了该处理工艺的过程控制策略。结果表明:该工艺可以在300 min内完全氧化亚硝态氮浓度高达2000 mg·L-1的钝化废水,高浓度亚硝态氮没有对生物降解过程产生明显抑制;反应过程中DO浓度的变化与亚硝态氮氧化过程存在相关性,溶解氧浓度的移动斜率变化(DO-MSC)可作为亚硝态氮氧化过程控制参数;当DO-MSC >0.02时,亚硝态氮氧化过程结束,此时可停止曝气。批次试验结果显示在不同曝气量(0.02~0.125 m3·h-1)和不同温度条件(15~30℃)下,DO-MSC指数均可有效指示亚硝态氮氧化终点。

关键词: 废水, 亚硝态氮, SBR, DO-MSC, 过程控制, 曝气, 温度

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