Intensified sulfamethoxazole removal in an electrolysis-integrated tidal flow constructed wetland system

Liu, Xiaohui1,2; Wang, Yongqiang1; Lu, Shaoyong1; Liu, Ying1; Zhao, Bin3; Xi, Beidou1; Guo, Xiaochun1; Guo, Wei4; Zhang, Jian5

2020

10.1016/j.cej.2020.124545

CHEMICAL ENGINEERING JOURNAL   影响因子和分区

1385-8947

1873-3212

This study aims to investigate the removal efficiency and mechanism of sulfamethoxazole (SMX) and fate of corresponding sul genes in an electrolysis-integrated tidal flow constructed wetland system (EC-TFCWs). Compared with the single-stage TFCWs, excellent SMX removal was obtained in EC-TFCWs (increased by nearly 20%) owing to synergistic effect of electrolysis-integrated microbial degradation and flocculation. However, SMX removal in EC-TFCWs can be affected by electrode materials with iron electrode higher removal (average removal efficiency = 81.86%) than that of graphite electrode (average removal efficiency = 77.83%). In addition, the removal efficiency of SMX increased from 65.52% to 84.23%, from 42.32% to 87.22% and from 66.33% to 91.9% with the increase of current intensity from 0.21 mA cm² to 1.50 m A cm², hydraulic retention time (HRT) from 6 h to 48 h and electrolytic time from 2 h to 8 h, respectively. This result indicated that the current intensity, electrolytic time and HRT played an important role in SMX removal. The absolute abundance of sul genes in zeolite and effluent in EC (iron)-TFCWs was lower than that of in TFCWs at long stress of SMX. However, iron sludge can become a reservoir of sul genes. A novel EC (iron)-persulfate-integrated TFCWs was developed to further improve the performance of EC (iron)-TFCWs (increased by nearly 10%), which achieved a better removal effect and lower abundance of sul genes than that of in EC (iron)-TFCWs, and SO4^[rad]− played a key important role.
© 2020 Elsevier B.V.

Constructed wetlands Electrolysis Persulfate Sulfamethoxazole Sul genes

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:000522640100070

Elsevier B.V.

20200908229672

Biodegradation ; Efficiency ; Electrolysis ; Genes ; Graphite electrodes ; Iron compounds ; Zeolites

Biological Materials and Tissue Engineering:461.2 ; Biotechnology:461.8 ; Electrochemistry:801.4.1 ; Inorganic Compounds:804.2 ; Production Engineering:913.1

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.College of Chemistry, Biology and Environment, Yuxi Normal University, Yuxi; 653100, China
4.School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen; 518055, China
5.School of Environmental Science & Engineering, Shandong University, Qingdao; 250100, China

Liu, Xiaohui,Wang, Yongqiang,Lu, Shaoyong,et al. Intensified sulfamethoxazole removal in an electrolysis-integrated tidal flow constructed wetland system[J]. CHEMICAL ENGINEERING JOURNAL,2020,390.

Liu, Xiaohui.,Wang, Yongqiang.,Lu, Shaoyong.,Liu, Ying.,Zhao, Bin.,...&Zhang, Jian.(2020).Intensified sulfamethoxazole removal in an electrolysis-integrated tidal flow constructed wetland system.CHEMICAL ENGINEERING JOURNAL,390.

Liu, Xiaohui,et al."Intensified sulfamethoxazole removal in an electrolysis-integrated tidal flow constructed wetland system".CHEMICAL ENGINEERING JOURNAL 390(2020).