The dissipation and risk alleviation mechanism of PAHs and nitrogen in constructed wetlands: The role of submerged macrophytes and their biofilms-leaves

Zhirui Qin, Zhenhua Zhao, Liling Xia, Abduelrahman Adam, Yong Li, Deqiang Chen, Sara Mela, Hui Li

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39 Citations (SciVal)
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Abstract

The role of submerged macrophytes (Vallisneria natans, Hydrilla verticillata and artificial plant) and their biofilms-leaves for the dissipation and risk alleviation mechanism of PAHs (phenanthrene and pyrene) and nitrogen in constructed wetland systems with PAH-polluted sediments were investigated. Biofilms-leaves/surface might contribute to PAHs degradation, which was positively correlated with PAHs degrading bacteria. Nitrogen-fixing bacteria in biofilms on surface might cause total nitrogen in sediment (TNs) increasing by 4% from 14th d to 28th d indirectly when suffering PAHs pollution. The relative abundance of nitrogen-fixing bacteria significantly increased with the increase of PAHs concentrations in early period (p < 0.01), which might lead to risk of nitrogen accumulation further. Heat maps showed that the relative abundance of functional bacteria were influenced in order of attached surface > incubation time > spiking concentration of PAHs. Interestingly, differences of deduced bacterial functions were affected in order of incubation time > attached surface > spiking concentration. Thus, submerged macrophytes and their biofilms on leaves not only played an important role in PAHs degradation, but also regulated the nitrogen cycling in constructed wetland systems, which could reduce these pollutants risk for natural environment, organisms and human health
Original languageEnglish
Article number104940
JournalEnvironment International
Volume131
Early online date05 Jul 2019
DOIs
Publication statusPublished - 01 Oct 2019

Keywords

  • sumerged macrophytes
  • PAHs dissipation
  • biofilms on leaves
  • nitrogen cycling
  • deduced functions
  • Submerged macrophytes
  • Biofilms on leaves
  • Deduced functions
  • Nitrogen cycling
  • Water Pollutants, Chemical/analysis
  • Phenanthrenes/analysis
  • Plant Leaves/metabolism
  • Pyrenes/analysis
  • Bacterial Physiological Phenomena
  • Nitrogen/analysis
  • Wetlands
  • Biofilms
  • Environmental Restoration and Remediation
  • Hydrocharitaceae/metabolism
  • Water Pollution, Chemical/prevention & control

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