TY - JOUR
T1 - The dissipation and risk alleviation mechanism of PAHs and nitrogen in constructed wetlands
T2 - The role of submerged macrophytes and their biofilms-leaves
AU - Qin, Zhirui
AU - Zhao, Zhenhua
AU - Xia, Liling
AU - Adam, Abduelrahman
AU - Li, Yong
AU - Chen, Deqiang
AU - Mela, Sara
AU - Li, Hui
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (Grants No. 51879080 , 51509129 , 41371307 ), Natural Science Foundation of Jiangsu Province , China ( BK20171435 ), National Key Research and Development Program of China (No. 2018YFC0407906 ), the Open Foundation of State Key Laboratory of Pollution Control and Resource Reuse (Grant No. PCRRF12010 ), the State Key Laboratory of Soil and Sustainable Agriculture (Institute of Soil Science, Chinese Academy of Sciences) foundation (Grant No. 0812201228 ), a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), and the Top-notch Academic Programs Project (TAPP) of Jiangsu Higher Education Institutions .
Publisher Copyright:
© 2019 The Authors
PY - 2019/10/1
Y1 - 2019/10/1
N2 - 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
AB - 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
KW - sumerged macrophytes
KW - PAHs dissipation
KW - biofilms on leaves
KW - nitrogen cycling
KW - deduced functions
KW - Submerged macrophytes
KW - Biofilms on leaves
KW - Deduced functions
KW - Nitrogen cycling
KW - Water Pollutants, Chemical/analysis
KW - Phenanthrenes/analysis
KW - Plant Leaves/metabolism
KW - Pyrenes/analysis
KW - Bacterial Physiological Phenomena
KW - Nitrogen/analysis
KW - Wetlands
KW - Biofilms
KW - Environmental Restoration and Remediation
KW - Hydrocharitaceae/metabolism
KW - Water Pollution, Chemical/prevention & control
UR - http://www.scopus.com/inward/record.url?scp=85068404823&partnerID=8YFLogxK
U2 - 10.1016/j.envint.2019.104940
DO - 10.1016/j.envint.2019.104940
M3 - Article
C2 - 31284108
SN - 0160-4120
VL - 131
JO - Environment International
JF - Environment International
M1 - 104940
ER -
