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

Authors Organisations
  • Zhirui Qin(Author)
    Hohai University
  • Zhenhua Zhao(Author)
    Hohai University
    Michigan State University
  • Liling Xia(Author)
    Nanjing Institute of Industry Technology
  • Abduelrahman Adam(Author)
    Hohai University
  • Yong Li(Author)
    Hohai University
  • Deqiang Chen(Author)
    Hohai University
  • Sara Mela(Author)
  • Hui Li(Author)
    Michigan State University
Type Article
Original languageEnglish
Article number104940
JournalEnvironment International
Early online date05 Jul 2019
Publication statusPublished - 01 Oct 2019
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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


  • sumerged macrophytes, PAHs dissipation, biofilms on leaves, nitrogen cycling, deduced functions