Performance of various media in vertical flow constructed wetland for the treatment of domestic wastewater

2019 ◽  
Vol 146 ◽  
pp. 57-67
Author(s):  
K. Soundaranayaki ◽  
R. Gandhimathi
Keyword(s):  
Constructed Wetland ◽  
Domestic Wastewater ◽  
Vertical Flow ◽  
Vertical Flow Constructed Wetland

Effects of a saturated layer and recirculation on nitrogen treatment performances of a single stage Vertical Flow Constructed Wetland (VFCW)

2013 ◽  
Vol 68 (7) ◽  
pp. 1461-1467 ◽  
Author(s):  
S. Prigent ◽  
J. Paing ◽  
Y. Andres ◽  
F. Chazarenc
Keyword(s):  
Constructed Wetland ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Single Stage ◽  
Vertical Flow ◽  
Saturated Layer ◽  
Vertical Flow Constructed Wetland ◽  
Hydraulic Load ◽  
Nitrogen Concentrations ◽  
Kjeldahl Nitrogen

Upgrades to enhance nitrogen removal were tested in a 2 year old pilot vertical flow constructed wetland in spring and summer periods. The effects of a saturated layer and of recirculation were tested in particular. Two pilots (L = 2 m, W = 1.25 m, H = 1.2 m), filled with expanded schist (Mayennite®), were designed with hydraulic saturated layers of 20 and 40 cm at the bottom. Each pilot was fed with raw domestic wastewater under field conditions according to a hydraulic load of 15–38 cm d−1 (i.e. 158–401 g COD (chemical oxygen demand) m−2 d−1) and to recirculation rates ranging from 0% up to 150%. The initial load during the first 2 years of operation resulted in an incomplete mineralized accumulated sludge leading to total suspended solids (TSS), COD and biochemical oxygen demand (BOD5) release. A 40 cm hydraulic saturated layer enabled an increase of 5–10% total nitrogen (TN) removal compared to a 20 cm saturated layer. Recirculation allowed the dilution of raw wastewater and enhanced nitrification in a single stage. A design of 1.8 m² pe−1 (48 cm d−1, 191 g COD m−2 d−1) with a 40 cm saturated layer and 100% recirculation enabled the French standard D4 (35 mg TSS L−1, 125 mg COD L−1, 25 mg BOD5 L−1), nitrogen concentrations below 20 mg TKN (total Kjeldahl nitrogen) L−1 and 50 mg TN L−1, to be met.

A recirculating vertical flow constructed wetland for the treatment of domestic wastewater

Desalination ◽  
2009 ◽  
Vol 246 (1-3) ◽  
pp. 617-624 ◽  
Author(s):  
M.Y. Sklarz ◽  
A. Gross ◽  
A. Yakirevich ◽  
M.I.M. Soares
Keyword(s):  
Constructed Wetland ◽  
Domestic Wastewater ◽  
Vertical Flow ◽  
Vertical Flow Constructed Wetland

Treatment performance of integrated vertical-flow constructed wetland plots for domestic wastewater

2012 ◽  
Vol 44 ◽  
pp. 152-159 ◽  
Author(s):  
Jun-jun Chang ◽  
Su-qing Wu ◽  
Yan-ran Dai ◽  
Wei Liang ◽  
Zhen-bin Wu
Keyword(s):  
Constructed Wetland ◽  
Domestic Wastewater ◽  
Vertical Flow ◽  
Treatment Performance ◽  
Vertical Flow Constructed Wetland

Treatment of domestic wastewater by vertical flow constructed wetland planted with umbrella sedge and Vetiver grass

2013 ◽  
Vol 68 (6) ◽  
pp. 1345-1351 ◽  
Author(s):  
Suwasa Kantawanichkul ◽  
Somsiri Sattayapanich ◽  
Frank van Dien
Keyword(s):  
Removal Efficiency ◽  
Constructed Wetland ◽  
Plant Biomass ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Nitrogen Accumulation ◽  
Vertical Flow ◽  
Vetiver Grass ◽  
Vetiveria Zizanioides ◽  
Vertical Flow Constructed Wetland

The aim of this study was to investigate the efficiency of wastewater treatment by vertical flow constructed wetland systems under different hydraulic loading rates (HLR). The comparison of two types of plants, Cyperus alternifolius (Umbrella sedge) and Vetiveria zizanioides (Vetiver grass), was also conducted. In this study, six circular concrete tanks (diameter 0.8 m) were filled with fine sand and gravel to the depth of 1.23 m. Three tanks were planted with Umbrella sedge and the other three tanks were planted with Vetiver grass. Settled domestic wastewater from Chiang Mai University (chemical oxygen demand (COD), NH4+-N and suspended solids (SS) of 127.1, 27.4 and 29.5 mg/L on average, respectively) was intermittently applied for 45 min and rested for 3 h 15 min. The HLR of each tank was controlled at 20, 29 and 40 cm/d. It was found that the removal efficiency of the Umbrella sedge systems was higher than the Vetiver grass systems for every parameter, and the lowest HLR provided the maximum treatment efficiency. The removal efficiency of COD and nitrogen in terms of total Kjeldahl nitrogen (TKN) was 76 and 65% at 20 cm/d HLR for Umbrella sedge compared to only 67 and 56% for Vetiver grass. Nitrogen accumulation in plant biomass was also higher in Umbrella sedge than in Vetiver grass in every HLR. Umbrella sedge was thus proved to be a suitable constructed wetland plant in tropical climates.

Modeling nitrogen removal in a vertical flow constructed wetland treating directly domestic wastewater

2014 ◽  
Vol 70 ◽  
pp. 379-386 ◽  
Author(s):  
Ania Morvannou ◽  
Jean-Marc Choubert ◽  
Marnik Vanclooster ◽  
Pascal Molle
Keyword(s):  
Nitrogen Removal ◽  
Constructed Wetland ◽  
Domestic Wastewater ◽  
Vertical Flow ◽  
Vertical Flow Constructed Wetland
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