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Environmental Science and Pollution Research

, Volume 23, Issue 15, pp 15524–15531 | Cite as

Effect of photosynthetically elevated pH on performance of surface flow-constructed wetland planted with Phragmites australis

  • Xiaole Yin
  • Jian ZhangEmail author
  • Zhen Hu
  • Huijun Xie
  • Wenshan Guo
  • Qingsong Wang
  • Huu Hao Ngo
  • Shuang Liang
  • Shaoyong Lu
  • Weizhong Wu
Research Article

Abstract

Combination of emergent and submerged plants has been proved to be able to enhance pollutant removal efficiency of surface flow-constructed wetland (SFCW) during winter. However, intensive photosynthesis of submerged plants during summer would cause pH increase, which may have adverse effects on emergent plants. In this study, nitrogen transformation of lab-scale SFCW under pH gradient of 7.5, 8.5, 9.5 and 10.5 was systematically investigated. The results showed that total nitrogen (TN) removal efficiency decreased from 76.3 ± 0.04 to 51.8 ± 0.04 % when pH increased from 7.5 to 10.5, which was mainly attributed to plant assimilation decay and inhibition of microbe activities (i.e., nitrite-oxidizing bacteria and denitrifiers). Besides, the highest sediment adsorption in SFCW was observed at pH of 8.5. In general, the combination of submerged and emergent plants is feasible for most of the year, but precaution should be taken to mitigate the negative effect of high alkaline conditions when pH rises to above 8.5 in midsummer.

Keywords

Constructed wetland Plant species combination Photosynthetically elevated pH Nitrogen transformation Nitrification and denitrification 

Notes

Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 21307076, No. 21177075, and No. 51578321) and the Fundamental Research Funds of Shandong University (No. 2014TB003 and No. 2015JC056). The authors thank Wang Zhibin, Yang Zhongchen, and Liu Jianing for their assistance with this project.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Xiaole Yin
    • 1
  • Jian Zhang
    • 1
    Email author
  • Zhen Hu
    • 1
  • Huijun Xie
    • 2
  • Wenshan Guo
    • 3
  • Qingsong Wang
    • 4
  • Huu Hao Ngo
    • 3
  • Shuang Liang
    • 1
  • Shaoyong Lu
    • 1
  • Weizhong Wu
    • 5
  1. 1.Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and EngineeringShandong UniversityJinanPeople’s Republic of China
  2. 2.Environment Research InstituteShandong UniversityJinanPeople’s Republic of China
  3. 3.School of Civil and Environmental EngineeringUniversity of Technology SydneyBroadwayAustralia
  4. 4.School of Energy and Power EngineeringShandong UniversityJinanPeople’s Republic of China
  5. 5.College of Environmental Science and EngineeringPeking UniversityBeijingPeople’s Republic of China

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