基于Fe<sup>0</sup>的地下水混养反硝化脱氮效能与机制

宋宾学; 何月玲; 贾林春; 曾琳; 陈红; 薛罡

doi:10.13205/j.hjgc.202208003

基于Fe⁰的地下水混养反硝化脱氮效能与机制

doi: 10.13205/j.hjgc.202208003

宋宾学¹,
何月玲¹,
贾林春¹,
曾琳¹,
陈红¹,
薛罡^1,2, ,

1. 东华大学环境科学与工程学院, 上海 201620;
2. 国家染整工程技术研究中心, 上海 201620

基金项目:

国家重点研发计划项目(2019YFD1100502)

国家自然科学基金(51878135、51878136、52070040)

详细信息

作者简介:
宋宾学(1996-),男,硕士研究生,主要研究方向为水污染控制技术。songbinxue_anda@163.com

通讯作者:
薛罡(1971-),男,教授,主要研究方向为水污染控制工程。xuegang@dhu.edu.cn

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- 被引次数: 0
出版历程
- 收稿日期: 2021-08-25
- 刊出日期: 2022-11-08

Fe⁰ SUPPORTED MIXOTROPHIC DENITRIFICATION FOR GROUNDWATER TREATMENTS: PERFORMANCE AND POTENTIAL MECHANISM

1. School of Environmental Science and Engineering, Donghua University, Shanghai 201620, China;
2. National Engineering Research Center for Dyeing and Finishing of Textiles, Donghua University, Shanghai 201620, China

摘要

摘要: 以含硝态氮(NO₃^--N)的模拟地下水为研究对象,采用零价铁(Fe⁰)与生物耦合实现混养反硝化高效脱氮。结果表明:在C/N为2.78~3.08时,1号反应器(仅添加活性污泥)平均TN和NO₃^--N去除率分别为39.6%和40.1%,而2号反应器(添加活性污泥+Fe⁰)中平均TN和NO₃^--N去除率分别为80.7%和81.4%。2号反应器单批次物质转化结果表明,1个反应周期内包含2个阶段:0~12 h混养反硝化阶段及12~24 h自养反硝化阶段,且脱氮过程集中在前12 h;零级动力学结果表明,0~12 h的反硝化速率为2.38 mg/(L·h),是12~24 h反硝化速率的9.5倍;通过理论计算可知,4~12 h自养及异养脱氮贡献比例较稳定,两者比值约为4∶6,12~24 h自养反硝化作用贡献占比为100%。SEM和XRD分析结果表明,Fe⁰表面有明显的微生物腐蚀现象,FeOOH和含铁有机复合物是主要的腐蚀产物。微生物群落结构分析表明,Fe⁰可有效提高菌落多样性与丰富性,且动胶菌属(Zoogloea)作为优势菌属在反硝化过程中起主导作用。
- 地下水 /
- Fe⁰ /
- 混养反硝化 /
- C/N /
- 微生物群落结构
Abstract: To achieve high-efficiency denitrification of groundwater containing NO₃^--N, Fe⁰ was added to strengthen biological mixotrophic denitrification. The results showed that when C/N was 2.78~3.08, the average TN and NO₃^--N removal efficiency of reactor 1 were 39.6% and 40.1%, and they were 80.7% and 81.4% in reactor 2 adding Fe⁰. The results of substance transformation in a single batch of reactor 2 showed that one reaction cycle was composed of two stages: mixotrophic denitrification stage in 0~12 h and autotrophic denitrification stage in 12~24 h, and the denitrification process mainly occurred in stage of 0~12 h; the zero-order kinetics fitting results revealed that the denitrification rate was 2.38 mg/(L·h) in 0~12 h, 9.5 times of that in 12~24 h; in 4~12 h, the contribution ratio of autotrophic and heterotrophic denitrification was stable (about 4∶6), and contribution ratio of autotrophic denitrification was 100% in 12~24 h. Moreover, SEM and XRD analysis showed that there was significant microbial corrosion on the surface of Fe⁰, and the major products were FeOOH and bioorganic-Fe complexes. Microbial community structure analysis result indicated that Fe⁰ could effectively improve the diversity and richness of microbial community, and Zoogloea played a leading role in the denitrification process as the predominant genus.
- groundwater /
- Fe⁰ /
- mixotrophic denitrification /
- C/N /
- microbial community structure

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