High degree of contaminant removal and evolution of microbial community in different electrolysis-integrated constructed wetland systems

Liu, Xiaohui1,2; Liu, Ying1; Guo, Xiaochun1; Lu, Shaoyong1; Wang, Yongqiang1; Zhang, Jian3; Guo, Wei4; Xi, Beidou1,2

2020

10.1016/j.cej.2020.124391

CHEMICAL ENGINEERING JOURNAL   影响因子和分区

1385-8947

1873-3212

The molecular mechanism of contaminant removal in different electrolysis -integrated constructed wetlands (CWs) was explored. Electrolysis (microbial fuel cells (MFC) and direct current (EC))-integrated CWs achieved high removal efficiencies for chemical oxygen demand (COD; 82.18% in MFC-CWs and 81.57% in EC-CWs), total nitrogen (TN; 75.08% in MFC-CWs and 69.19% in EC-CWs) and total phosphorus (TP; 92.56% in MFC-CWs and 92.86%), which was higher than that in CWs. Additionally, MFC-CWs had an average voltage of 384.56 ± 44.49 mV with the highest power density of 977 mW m⁻². The pollutant removal performance of the MFC-CWs was better than that of the EC-CWs. Microorganisms in electrolysis-integrated CWs, especially in the MFC-CWs, gained higher diversity and richness than those in CWS. However, the effects between MFC and EC for CWs were different. In addition, nitrogen functional genes in electrolysis-integrated CWs were significantly more abundant than those in the CWs, and the electron transfer rate also increased. Combined analyses of microorganisms and functional genes revealed that the main contributors to nitrogen removal were anaerobic ammoxidation, ammonia oxidation, denitrification, and dissimilatory nitrate reduction to ammonium (DNRA) for CWs, anaerobic ammoxidation, ammonia oxidation, denitrification and DNRA for EC-CWs, anaerobic ammoxidation, ammonia oxidation and denitrification for MFC-CWs
© 2020 Elsevier B.V.

Constructed wetlands Electrolysis Contaminant removal Microbial diversity

EI ; SCI

英语

其他

Major Science and Technology Program for Water Pollution Control and Treatment[2018ZX07208008] ; National Natural Science Foundation of China[41877409] ; National Natural Science Foundation of China[]

Engineering

Engineering, Environmental ; Engineering, Chemical

WOS:000545646800081

Elsevier B.V.

20200708164992

Ammonia ; Chemical oxygen demand ; Denitrification ; Electrolysis ; Genes ; Microorganisms ; Nitrogen removal ; Oxidation ; Water pollution control ; Wetlands

Water Pollution Control:453.2 ; Bioengineering and Biology:461 ; Chemical Reactions:802.2 ; Inorganic Compounds:804.2

ENGINEERING

EV Compendex

1.State Key Laboratory of Environmental Criteria a Risk Assessment, National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, State Environmental Protection Scientific Observation and Research Station for Lake Dongtinghu (SEPSORSLD), Chinese Research Academy of Environmental Sciences, Beijing; 100012, China
2.School of Environment, Tsinghua University, Beijing; 100084, China
3.School of Environmental Science & Engineering, Shandong University, Qingdao; 250100, China
4.School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen; 518055, China

Liu, Xiaohui,Liu, Ying,Guo, Xiaochun,et al. High degree of contaminant removal and evolution of microbial community in different electrolysis-integrated constructed wetland systems[J]. CHEMICAL ENGINEERING JOURNAL,2020,388.

Liu, Xiaohui.,Liu, Ying.,Guo, Xiaochun.,Lu, Shaoyong.,Wang, Yongqiang.,...&Xi, Beidou.(2020).High degree of contaminant removal and evolution of microbial community in different electrolysis-integrated constructed wetland systems.CHEMICAL ENGINEERING JOURNAL,388.

Liu, Xiaohui,et al."High degree of contaminant removal and evolution of microbial community in different electrolysis-integrated constructed wetland systems".CHEMICAL ENGINEERING JOURNAL 388(2020).