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Enhanced nitrogen removal in biochar-added surface flow constructed wetlands: dealing with seasonal variation in the north China

  • Jing Li
  • Jinlin Fan
  • Daoxing Liu
  • Zhen Hu
  • Jian Zhang
Research Article
  • 40 Downloads

Abstract

In the present study, the performance of surface flow constructed wetlands (SFCWs) added with different dosage of biochar (group A 0%, group B 10%, group C 20%; v/v) was investigated, to evaluate the effect of biochar on nitrogen removal of a constructed wetland. No significant difference was observed in NH4+-N removal among three groups even during different seasons. Labile organic carbon released from biochar distinctly enhanced denitrification process, which improved NO3-N removal efficiency by 4.58% in group B and 10.33% in group C. More importantly, compared with group A, biochar addition increased plant N removal by 82.24% and 192.11% in groups B and C, respectively. This result indicated that biochar could increase the accumulation of plant net biomass. In addition, TN removal of group A was much lower at low temperature (4.9 °C). However, no obvious influence of temperature on TN removal was observed in groups B and C with biochar addition. Microbial community analysis showed that, compared with that in group A, the total relative abundance of the main denitrification bacteria (Proteobacteria, Firmicutes, and Bacteroidetes) increased by 0.81% in group B and 13.63% in group C. These results provide a reasonable strategy for improving the performance of SFCWs under cold climate.

Keywords

Biochar addition Surface flow constructed wetlands Plant uptake Microbial community Seasonal variation Nitrogen removal 

Notes

Funding information

This work was supported by the National Natural Science Foundation of China (51878388, 51720105013, and 21507072), Natural Science Foundation of Shandong Province (ZR2018QEE006), and China Postdoctoral Science Foundation (2016M600539, 2017T100495).

Supplementary material

11356_2018_3895_MOESM1_ESM.pdf (244 kb)
ESM 1 (PDF 243 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and EngineeringShandong UniversityJinanPR China
  2. 2.National Engineering Laboratory of Coal-Fired Pollutants Emission ReductionShandong UniversityJinanPR China
  3. 3.Environmental Engineering Co., Ltd.Shandong Academy of Environmental ScienceJinanPR China
  4. 4.State key Laboratory of Microbial TechnologyShandong UniversityJinanPR China

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