Microporous intermittent aeration vertical flow constructed wetlands for eutrophic water improvement

2020 ◽  
Vol 27 (14) ◽  
pp. 16574-16583 ◽  
Author(s):  
Qing Wu ◽  
Jingjing Xiao ◽  
Lijuan Fu ◽  
Mengxing Ma ◽  
Sen Peng
Keyword(s):  
Constructed Wetlands ◽  
Vertical Flow ◽  
Intermittent Aeration ◽  
Vertical Flow Constructed Wetlands ◽  
Eutrophic Water

The use of vertical flow constructed wetlands for the treatment of hyper-eutrophic water bodies with dense cyanobacterial blooms

2017 ◽  
Vol 77 (5) ◽  
pp. 1186-1195 ◽  
Author(s):  
Fei Zhong ◽  
Wei Liu ◽  
Mengdan Lv ◽  
Zifa Deng ◽  
Juan Wu ◽  
...  
Keyword(s):  
Constructed Wetlands ◽  
Flow Direction ◽  
Total Suspended Solid ◽  
Freshwater Ecosystems ◽  
Water Bodies ◽  
Cyanobacterial Blooms ◽  
Economic Damage ◽  
Vertical Flow ◽  
Vertical Flow Constructed Wetlands ◽  
Eutrophic Water

Abstract Eutrophication often leads to the periodic proliferation of harmful cyanobacterial blooms (HCBs), which threaten the sustainability of freshwater ecosystems and lead to serious environmental, health and economic damage. Hence, it is vitally important to take effective measures to manage HCBs and associated problems. In this study, vertical flow constructed wetlands (CWs) were operated under different hydraulic loading rates (HLRs) to treat a hyper-eutrophic water body with HCBs. Six sampling ports (representing different layers) were evenly distributed along the water flow direction to study the purification processes of CWs. With HLRs ranging from 0.2 m/d to 0.8 m/d, total nitrogen (TN), total phosphorus (TP), COD, total suspended solid (TSS) and Chlorophyll a (Chl.a) were efficiently treated by CWs, and they were mainly removed at the second layer of CWs. The concentrations of two cyanobacterial metabolites (geosmin and β-cyclocitral) in the effluent were mostly below their odorous threshold concentrations. As the HLRs increased, the treatment efficiencies of the CWs decreased gradually. There was no removal of TP, Chl.a, geosmin, or β-cyclocitral at an HLR of 1.0 m/d. Under suitable HLRs, this type of CW could provide a promising way to control HCBs and associated odorous problems in hyper-eutrophic water bodies.

Removal of chlorpyrifos in recirculating vertical flow constructed wetlands with five wetland plant species

Chemosphere ◽  
2019 ◽  
Vol 216 ◽  
pp. 195-202 ◽  
Author(s):  
Xiao-Yan Tang ◽  
Yang Yang ◽  
Murray B. McBride ◽  
Ran Tao ◽  
Yu-Nv Dai ◽  
...  
Keyword(s):  
Plant Species ◽  
Constructed Wetlands ◽  
Vertical Flow ◽  
Wetland Plant ◽  
Vertical Flow Constructed Wetlands
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