Removal of antibiotics and resistance genes from swine wastewater using vertical flow constructed wetlands: Effect of hydraulic flow direction and substrate type

Experiment simulates the integrated vertical flow constructed wetland (IVCW) operation of the system, discusses the trend of Dissolved Oxygen (DO) within the system and the relativity of DO and removing nitrogen. The results show that NH4+-N, NO3—-N and DO decrease along the flow direction in the integrated vertical flow constructed wetlands; NO3—-N increased and then decreased along the process; because of the DO of upstream pool is low, so the Total Nitrogen (TN) removing process occurs mainly in the downstream pool.

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Effect of clinoptilolite on ammonia emissions in integrated vertical-flow constructed wetlands (IVCWs) treating swine wastewater

Ecological Engineering ◽

10.1016/j.ecoleng.2018.07.037 ◽

2018 ◽

Vol 122 ◽

pp. 153-158 ◽

Cited By ~ 9

Author(s):

Lu Du ◽

Xuantung Trinh ◽

Qianru Chen ◽

Chuan Wang ◽

Shuangyuan Liu ◽

...

Keyword(s):

Constructed Wetlands ◽

Swine Wastewater ◽

Ammonia Emissions ◽

Vertical Flow ◽

Vertical Flow Constructed Wetlands

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

Water Science & Technology ◽

10.2166/wst.2017.635 ◽

2017 ◽

Vol 77 (5) ◽

pp. 1186-1195 ◽

Cited By ~ 1

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.

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