Nitrogen removal efficiencies and pathways from unsaturated and saturated zones in a laboratory-scale vertical flow constructed wetland

2018 ◽  
Vol 228 ◽  
pp. 466-474 ◽  
Author(s):  
Rasha Al-Saedi ◽  
Keith Smettem ◽  
Kadambot H.M. Siddique
Keyword(s):  
Nitrogen Removal ◽  
Constructed Wetland ◽  
Laboratory Scale ◽  
Vertical Flow ◽  
Vertical Flow Constructed Wetland ◽  
Removal Efficiencies

scholarly journals Performance monitoring of a vertical flow constructed wetland treating municipal wastewater

2013 ◽  
Vol 9 (3) ◽  
pp. 277-285
Keyword(s):  
Water Quality ◽  
Constructed Wetland ◽  
Performance Monitoring ◽  
Municipal Wastewater ◽  
Monitoring Program ◽  
Vertical Flow ◽  
Total Coliforms ◽  
Vertical Flow Constructed Wetland ◽  
Reliable Performance ◽  
Removal Efficiencies

A two-year monitoring program was undertaken in a vertical flow constructed wetland treating wastewater from Gomati, a village in Chalkidiki, North Greece. This constructed wetland operates since 2003. The monitoring campaigns were organized every 15 days. Water quality samples were collected at the inlet, at intermediate points (i.e., at the end of each treatment stage) and at the outlet of the system. Measured mean removal efficiencies were as follows: 92.3% for BOD, 91.7% for COD, 80.3% for TKN, 87.5% for ΝΗ4 +, 61.3% for TP, 45.7% for ortho-phosphates, 93.2% for TSS and 99.9% for total coliforms, which suggests a satisfactory and reliable performance of such systems in Greece. The paper presents facility description, study details and monitoring results.

High-rate nitrogen removal in a two-stage subsurface vertical flow constructed wetland

Desalination ◽  
2009 ◽  
Vol 246 (1-3) ◽  
pp. 55-68 ◽  
Author(s):  
Guenter Langergraber ◽  
Klaus Leroch ◽  
Alexander Pressl ◽  
Kirsten Sleytr ◽  
Roland Rohrhofer ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Constructed Wetland ◽  
High Rate ◽  
Vertical Flow ◽  
Two Stage ◽  
Vertical Flow Constructed Wetland

Vertical flow constructed wetland for textile effluent treatment

2007 ◽  
Vol 55 (7) ◽  
pp. 127-134 ◽  
Author(s):  
L.C. Davies ◽  
A. Vacas ◽  
J.M. Novais ◽  
F.G. Freire ◽  
S. Martins-Dias
Keyword(s):  
Constructed Wetland ◽  
Effluent Treatment ◽  
Textile Effluent ◽  
Model Parameters ◽  
Vertical Flow ◽  
Mass Load ◽  
Vertical Flow Constructed Wetland ◽  
Pulse Feed ◽  
In Series ◽  
Removal Efficiencies

A pulse feed vertical flow constructed wetland (VFCW) proved to be efficient in the treatment of a textile effluent being able to buffer, dilute and treat an Acid Orange (AO7) accidental discharge. The influence of the flooding level (FL) and pulse feed (PF) duration on the removal efficiencies of a VFCW was examined. Average AO7 removal efficiencies of 70% were achieved for an AO7 Inlet concentration of 700 mg l−1 applied during 15 min cycle−1 (every three hours) at a hydraulic load of 13 l m−2 cycle−1 and an FL of 21%. The VFCW was modelled by analogy with a combination of ideal reactors. The simplest combination that best reproduced the experimental results was an association of 2 reactors in series plus 1 reactor accounting the dead volumes. The model parameters helped to understand the hydrological and kinetic processes occurring in VFCW. Through the model simulation it was shown that 3 VFCW in series were enough to efficiently treat an organic mass load of 76 gAO7 m−2 day−1 in 9 hours and fulfil the discharge legislation. In this work it was possible to establish that the overall degradation kinetics was of first order.

scholarly journals Phosphorus removal in a vertical flow constructed wetland using dolomite powder and chippings as filter media

2015 ◽  
Vol 1 (1) ◽  
pp. 46-52 ◽  
Author(s):  
Gražina Žibienė ◽  
Midona Dapkienė ◽  
Jurgita Kazakevičienė ◽  
Algirdas Radzevičius
Keyword(s):  
Total Phosphorus ◽  
Constructed Wetland ◽  
Phosphorus Removal ◽  
Pilot Scale ◽  
Laboratory Scale ◽  
Laboratory Research ◽  
Vertical Flow ◽  
Filter Media ◽  
Vertical Flow Constructed Wetland ◽  
One Year

Different kinds of natural and artificial filter media are able to retain phosphorus in the constructed wetlands. Due to the fact that the constructed wetland needs huge amounts of the filter media, it is very important to find locally available material which distinguishes itself by its ability to retain phosphorus. The materials found in Lithuania were considered and dolomite was chosen. Two dolomite fractions, dolomite powder (1–2 mm) and dolomite chippings (2–5 mm), and sand media were used in the laboratory- scale installed for the comparative experiments. The laboratory-scale with dolomite as the filter media was on average by 21% more efficient in total phosphorus removal in comparison with the sand media. Based on the laboratory research pilot–scale vertical flow constructed wetland of 160 m2 was installed and planted with reed Phragmites australis. The dolomite chippings as filter media were chosen in order to avoid the danger of the clogging of constructed wetland. Efficiency of total phosphorus removal in the pilot-scale vertical flow constructed wetland was on average 95.7%, phosphates removal – 94.8% within one year.

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