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

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 ass...

Full description

Saved in:
Bibliographic Details
Published in:Water science and technology 2018-03, Vol.77 (5), p.1186-1195
Main Authors: Zhong, Fei, Liu, Wei, Lv, Mengdan, Deng, Zifa, Wu, Juan, Ji, Hongjiu, Cheng, Shuiping
Format: Article
Language:English
Subjects:
Algae
Ammonium nitrogen
Aquatic ecosystems
Artificial wetlands
Blooms
Chlorophyll
Chlorophyll a
Ecosystems
Eutrophic environments
Eutrophic waters
Eutrophication
Fish
Fishery products
Freshwater
Freshwater ecosystems
Geosmin
Hydraulic loading
Ictalurus punctatus
Inland water environment
Metabolites
Phosphorus
Proliferation
Purification
Removal
Suspended solids
Sustainability
Vertical flow
Vertical mixing
Water bodies
Water flow
Water purification
Water quality
Wetlands
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2017.635