工业水处理 ›› 2022, Vol. 42 ›› Issue (6): 159-167. doi: 10.19965/j.cnki.iwt.2021-0935

• 试验研究 • 上一篇    下一篇

C/N对短程反硝化NO2 --N积累特性影响及机理分析

柳全龙1(), 范亚骏2, 张淼1(), 崔亚净1, 周杨3   

  1. 1. 扬州大学环境科学与工程学院, 江苏 扬州 225127
    2. 扬州工业职业技术学院, 江苏 扬州 225127
    3. 江苏省水利勘测设计研究院有限公司, 江苏 扬州 225000
  • 收稿日期:2022-04-14 出版日期:2022-06-20 发布日期:2022-06-22
  • 作者简介:

    柳全龙(1999— ),本科。电话:19825305348,E-mail:

    张淼,副教授,E-mail:

  • 基金资助:
    江苏省研究生科研创新计划项目(KYCX21_3224); 扬州工业职业技术学院自然科学类科研课题项目(2021xjzk016)

Influence of C/N on NO2 --N accumulation characteristic and mechanism analysis in short-cut denitrification

Quanlong LIU1(), Yajun FAN2, Miao ZHANG1(), Yajing CUI1, Yang ZHOU3   

  1. 1. College of Environmental Science and Engineering,Yangzhou University,Yangzhou 225127,China
    2. Yangzhou Polytechnic Institute,Yangzhou 225127,China
    3. Jiangsu Surveying and Design Institute of Water Resource Company Limited,Yangzhou 225000,China
  • Received:2022-04-14 Online:2022-06-20 Published:2022-06-22

摘要:

采用间歇式批次实验,考察不同进水C/N(以COD/NO3 --N计,2.0、2.5、3.3、5.0)条件下短程反硝化过程NO2 --N的积累特性及影响机理。实验结果表明,以乙酸钠作为碳源,当C/N为2.0~2.5时,NO2 --N转化率(NTR)随C/N的升高而升高,在C/N=2.5时,NTR达到最高值82.18%;C/N为3.3~5.0时,NTR随C/N的升高急剧下降,当C/N=5.0时,反应器内几乎没有NO2 --N的积累。此外,C/N=2.0~2.5与C/N=3.3~5.0工况下NO2 --N积累的机理是不同的,前者取决于高浓度NO3 --N对亚硝酸盐还原酶(NiR)的抑制,而后者主要依赖于不完全反硝化菌在污泥菌群结构中占优势。对接种污泥及4组反应器内的污泥样品进行高通量测序分析,结果表明ThaueraFlavobacterium、Saprospiraceae是实现短程反硝化的主要功能菌属。

关键词: 碳氮比, 短程反硝化, NO2 --N积累, 微生物特性

Abstract:

The characteristics and influencing mechanism of nitrite(NO2 --N) accumulation during short-cut denitrification process were studied in a sequencing batch reactor by controlling initial influent C/N ratios(COD/NO3 --N=2.0、2.5、3.3、5.0). The experimental results showed that the nitrate-to-nitrite transformation ratio(NTR) increased with the increasing C/N from 2.0 to 2.5 with sodium acetate as carbon source,and NTR reached the highest value of 82.18% at C/N of 2.5. When C/N was 3.3-5.0,NTR decreased sharply with the increasement of C/N,and there was almost no accumulation of NO2 --N in the reactor at C/N of 5.0. In addition,the mechanisms of NO2 --N accumulation under the conditions of C/N=2.0-2.5 and C/N=3.3-5.0 were different. The former depended on the inhibition of NO2 --N reductase by high NO3 --N concentration,while the latter mainly depended on the dominance of incomplete denitrifying bacteria in the sludge microbial structure. The high-throughput sequencing analysis of inoculated sludge and sludge samples in four reactors showed that ThaueraFlavobacterium and Saprospiraceae were the main functional bacteria for short-cut denitrification.

Key words: C/N, short-cut denitrification, nitrite accumulation, microbial characteristic

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