Simultaneous nitrification and denitrification in non-planted pilot-scale modified vertical flow constructed wetland system

2013 ◽  
Vol 8 (2) ◽  
pp. 192-200
Author(s):  
Zuxin Xu ◽  
Xiaoli Du ◽  
Sheng Wang
Keyword(s):  
Constructed Wetland ◽  
Pilot Scale ◽  
Simultaneous Nitrification And Denitrification ◽  
Vertical Flow ◽  
Vertical Flow Constructed Wetland ◽  
Wetland System ◽  
Nitrification And Denitrification

scholarly journals Pilot-scale study of vertical flow constructed wetland combined with trickling filter and ferric chloride coagulation: influence of irregular operational conditions

2015 ◽  
Vol 71 (7) ◽  
pp. 1088-1096 ◽  
Author(s):  
B. Kim ◽  
M. Gautier ◽  
G. Olvera Palma ◽  
P. Molle ◽  
P. Michel ◽  
...  
Keyword(s):  
Constructed Wetland ◽  
Phosphorus Removal ◽  
Water Saturation ◽  
Oxygen Demand ◽  
Pilot Scale ◽  
Saturation Level ◽  
Vertical Flow ◽  
Trickling Filter ◽  
Operational Conditions ◽  
Vertical Flow Constructed Wetland

The aim of this study was to characterize the efficiency of an intensified process of vertical flow constructed wetland having the following particularities: (i) biological pretreatment by trickling filter, (ii) FeCl3 injection for dissolved phosphorus removal and (iii) succession of different levels of redox conditions along the process line. A pilot-scale set-up designed to simulate a real-scale plant was constructed and operated using real wastewater. The influences of FeCl3 injection and water saturation level within the vertical flow constructed wetland stage on treatment performances were studied. Three different water saturation levels were compared by monitoring: suspended solids (SS), total phosphorus (TP), dissolved chemical oxygen demand (COD), ammonium, nitrate, phosphate, iron, and manganese. The results confirmed the good overall efficiency of the process and the contribution of the trickling filter pretreatment to COD removal and nitrification. The effects of water saturation level and FeCl3 injection on phosphorus removal were evaluated by analysis of the correlations between the variables. Under unsaturated conditions, good nitrification and no denitrification were observed. Under partly saturated conditions, both nitrification and denitrification were obtained, along with a good retention of SSs. Finally, under saturated conditions, the performance was decreased for almost all parameters.

Treatment of olive mill and municipal wastewater mixture by pilot scale vertical flow constructed wetland

2020 ◽  
Vol 198 ◽  
pp. 126-139
Author(s):  
Ayoub El Ghadraoui ◽  
Naaila Ouazzani ◽  
Abdelaali Ahmali ◽  
Tawfiq El Hakim El Mansour ◽  
Faissal Aziz ◽  
...  
Keyword(s):  
Constructed Wetland ◽  
Municipal Wastewater ◽  
Pilot Scale ◽  
Vertical Flow ◽  
Vertical Flow Constructed Wetland ◽  
Olive Mill

Removal of arsenic by pilot-scale vertical flow constructed wetland

2021 ◽  
Vol 15 (4) ◽  
Author(s):  
Yaocheng Fan ◽  
Tiancui Li ◽  
Deshou Cun ◽  
Haibing Tang ◽  
Yanran Dai ◽  
...  
Keyword(s):  
Constructed Wetland ◽  
Pilot Scale ◽  
Vertical Flow ◽  
Vertical Flow Constructed Wetland ◽  
Removal Of Arsenic

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.

Removal of indicator bacteria from municipal wastewater in an experimental two-stage vertical flow constructed wetland system

2003 ◽  
Vol 48 (5) ◽  
pp. 35-41 ◽  
Author(s):  
C.A. Arias ◽  
A. Cabello ◽  
H. Brix ◽  
N.-H. Johansen
Keyword(s):  
Constructed Wetland ◽  
Rate Constants ◽  
Indicator Bacteria ◽  
Vertical Flow ◽  
Faecal Coliforms ◽  
Total Coliforms ◽  
Sedimentation Tank ◽  
Vertical Flow Constructed Wetland ◽  
Wetland System ◽  
Faecal Streptococci

The removal of sanitary indicator bacteria (total coliforms, faecal coliforms, and faecal streptococci) was studied in an experimental constructed wetland system consisting of (1) a 2-m3 three-chamber sedimentation tank, (2) a 5 m2 vertical flow constructed wetland, (3) a filter-unit with calcite aimed at removing phosphorus, and (4) a 10 m2 vertical flow constructed wetland. The indicator bacteria were enumerated before and after each unit of the wetland system during four monitoring episodes with different loading conditions. At a hydraulic loading rate of 520-1,370 mm/d, the first-stage vertical flow beds removed about 1.5 log-units of total coliforms, 1.7 log-units of faecal coliforms and 0.8 log-units of faecal streptococci. In the second stage bed receiving lower loadings both in term of concentration and quantity (260-690 mm/day), the eliminations were lower. It was not possible in the present study to identify any seasonal effects, but no measurements were done during summer. Recycling of treated effluent back to the sedimentation tank did not affect elimination. Area-based rate constants for the vertical flow wetland receiving effluent from the sedimentation tank averaged 3.2 m/d for total coliforms, 3.3 m/d for faecal coliforms and 2.1 m/d for faecal streptococci. The rate constants depended on loading rates. It is suggested that filtration is a major removal mechanism for bacterial indicator organisms in vertical flow constructed wetland systems.

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