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Mechanism of Iris sibirica and aeration combination on promoting the water purification performance of constructed wetland under low temperature

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Abstract

Temperature is an important factor affecting the water purification performance of constructed wetland (CW). In the previous study, the combined measures of Iris sibirica and aeration at the bottom of the first quarter filtration chamber could improve the pollutant removal capacity of CW at low temperature. However, the mechanism between the combined measures of Iris sibirica and aeration on enhancing the performance of domestic sewage treatment is unclear. Our study aims to provide scientific validation for the combined measure through monitoring the concentrations of dissolved oxygen (DO), chemical oxygen demand (CODCr), ammonia nitrogen (NH4+-N), and total nitrogen (TN) along the water flow pathway of the CW and measuring the superoxide dismutase (SOD) activities of the plants and the abundance of nitrogen cycle-related microbial functional genes in the substrates of CW to explore the mechanism of combined measures promoting the removal efficiency of the CW under low-temperature stress. Results showed that aerating at the bottom of the first quarter filtration chamber increased DO concentration in the front part of the CW, which benefited the aerobic removal of pollutants and the activities of microorganisms, and the removal CODCr and NH4+-N occurred mainly in the front part of the CW. SOD activities showed that I. sibirica had better resistance to low temperature than Canna indica did. The combined measures of I. sibirica and aeration activated the activities of microorganisms, increased the abundance of the denitrification process genes along the water flow pathway and formed a clear nitrification–denitrification zone in the CW, thus promoted the nitrogen removal efficiency at low temperature. Therefore, this study confirmed the feasibility of the combined measures from a mechanistic perspective.

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Data Availability

The data that support the findings of this study are available from the corresponding author, Shuiping Cheng, upon reasonable request.

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Funding

This work was supported by (CSCEC-2021-Z-3) and (52170168). Author Shuiping Cheng has received research support from the China State Construction Engineering Corporation Science and Technology project and the National Natural Science Foundation of China.

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Authors and Affiliations

  1. Guangzhou Urban Planning & Design Survey Research Institute Co., Ltd, Guangzhou, 510060, China

    Xinyi Chen, Kejian Chen, Xiangqian Zeng & Dongling Duan

  2. Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China

    Xinyi Chen, Juan Wu & Shuiping Cheng

  3. Institute of Eco-Environmental Engineering, Tongji University, Shanghai, 200092, China

    Juan Wu & Shuiping Cheng

  4. School of Life Science, Nantong University, 9 Seyuan Road, Nantong, 226019, China

    Fei Zhong

  5. China Construction Eighth Engineering Division Co., Ltd, Shanghai, 200135, China

    Shaole Yu

Authors
  1. Xinyi Chen
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  2. Juan Wu
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  3. Fei Zhong
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  4. Shaole Yu
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  7. Dongling Duan
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  8. Shuiping Cheng
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Contributions

Conceptualization: Xinyi Chen, Shuiping Cheng; methodology: Xinyi Chen; formal analysis and investigation: Xinyi Chen, Juan Wu, Fei Zhong, Shuiping Cheng; writing — original draft preparation: Xinyi Chen, Fei Zhong, Shaole Yu, Kejian Chen, Xiangqian Zeng, Dongling Duan; writing — review and editing: Juan Wu, Shuiping Cheng; funding acquisition: Juan Wu, Shuiping Cheng; project administration: Shuiping Cheng; supervision: Shuiping Cheng; validation: Xinyi Chen, Fei Zhong, Shaole Yu; data curation: Juan Wu; software: Xinyi Chen, Kejian Chen, Xiangqian Zeng, Dongling Duan.

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Correspondence to Shuiping Cheng.

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Chen, X., Wu, J., Zhong, F. et al. Mechanism of Iris sibirica and aeration combination on promoting the water purification performance of constructed wetland under low temperature. Environ Sci Pollut Res 31, 19715–19724 (2024). https://doi.org/10.1007/s11356-024-32381-3

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