Improved solute transport and pollutant degradation model of free water surface constructed wetlands considering significant linear correlation between model parameters

2021 ◽  
Vol 327 ◽  
pp. 124817
Author(s):  
Chang-Qiang Guo ◽  
Yuan-Lai Cui
Keyword(s):  
Solute Transport ◽  
Constructed Wetlands ◽  
Linear Correlation ◽  
Water Surface ◽  
Free Water ◽  
Model Parameters ◽  
Pollutant Degradation ◽  
Degradation Model ◽  
Free Water Surface ◽  
Significant Linear Correlation

A model for organic matter removal in free water surface constructed wetlands

1998 ◽  
Vol 38 (1) ◽  
pp. 369-377 ◽  
Author(s):  
C. Polprasert ◽  
N. R. Khatiwada ◽  
J. Bhurtel
Keyword(s):  
Organic Matter ◽  
Constructed Wetlands ◽  
Water Surface ◽  
Oxygen Demand ◽  
Free Water ◽  
Domestic Wastewater ◽  
Pilot Scale ◽  
Cod Removal ◽  
Model Parameters ◽  
Free Water Surface

This study was conducted to determine performance of free water surface (FWS) constructed wetlands located in the tropics in the removal of organic matter and to assess the importance of biofilm bacteria in the overall kinetics of organic matter (or chemical oxygen demand, COD) removal. Because constructed wetlands normally contain both biofilm and suspended bacteria, a kinetic model incorporating the activities of these two bacteria groups, dispersion number and hydraulic retention time, was employed. The model parameters essential for the calculation of COD removal in FWS constructed wetlands were determined from the experiments and some from the literature. The model was found satisfactory in predicting COD removal efficiencies in a pilot-scale FWS constructed wetland unit treating a domestic wastewater.

Optimal design for hydraulic efficiency performance of free-water-surface constructed wetlands

2009 ◽  
Vol 35 (8) ◽  
pp. 1200-1207 ◽  
Author(s):  
Tsung-Min Su ◽  
Sheng-Chi Yang ◽  
Shang-Shu Shih ◽  
Hong-Yuan Lee
Keyword(s):  
Optimal Design ◽  
Constructed Wetlands ◽  
Water Surface ◽  
Free Water ◽  
Hydraulic Efficiency ◽  
Free Water Surface ◽  
Efficiency Performance

scholarly journals Spatial Changes in Microbial Communities along Different Functional Zones of a Free-Water Surface Wetland

2020 ◽  
Vol 8 (10) ◽  
pp. 1604
Author(s):  
Mikhail V. Semenov ◽  
George S. Krasnov ◽  
Ksenia Y. Rybka ◽  
Sergey L. Kharitonov ◽  
Yulia A. Zavgorodnyaya ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Constructed Wetlands ◽  
Organic Pollutants ◽  
Water Surface ◽  
Particle Diameter ◽  
Free Water ◽  
Free Water Surface ◽  
Spatial Changes ◽  
Functional Zones ◽  
Surface Wetland

Constructed wetlands (CWs) are complicated ecosystems that include vegetation, sediments, and the associated microbiome mediating numerous processes in wastewater treatment. CWs have various functional zones where contrasting biochemical processes occur. Since these zones are characterized by different particle-size composition, physicochemical conditions, and vegetation, one can expect the presence of distinct microbiomes across different CW zones. Here, we investigated spatial changes in microbiomes along different functional zones of a free-water surface wetland located in Moscow, Russia. The microbiome structure was analyzed using Illumina MiSeq amplicon sequencing. We also determined particle diameter and surface area of sediments, as well as chemical composition of organic pollutants in different CW zones. Specific organic particle aggregates similar to activated sludge flocs were identified in the sediments. The highest accumulation of hydrocarbons was found in the zones with predominant sedimentation of fine fractions. Phytofilters had the highest rate of organic pollutants decomposition and predominance of Smithella, Ignavibacterium, and Methanothrix. The sedimentation tank had lower microbial diversity, and higher relative abundances of Parcubacteria, Proteiniclasticum, and Macellibacteroides, as well as higher predicted abundances of genes related to methanogenesis and methanotrophy. Thus, spatial changes in microbiomes of constructed wetlands can be associated with different types of wastewater treatment processes.

scholarly journals Phytoremediation of domestic wastewaters in free water surface constructed wetlands usingAzolla pinnata

2015 ◽  
Vol 18 (1) ◽  
pp. 54-61 ◽  
Author(s):  
Christopher O. Akinbile ◽  
Temitope A. Ogunrinde ◽  
Hasfalina Che bt Man ◽  
Hamidi Abdul Aziz
Keyword(s):  
Constructed Wetlands ◽  
Water Surface ◽  
Free Water ◽  
Free Water Surface

scholarly journals Biokinetic model for nitrogen removal in free water surface constructed wetlands

2017 ◽  
Vol 587-588 ◽  
pp. 145-156 ◽  
Author(s):  
S. Gargallo ◽  
M. Martín ◽  
N. Oliver ◽  
C. Hernández-Crespo
Keyword(s):  
Constructed Wetlands ◽  
Nitrogen Removal ◽  
Water Surface ◽  
Free Water ◽  
Free Water Surface ◽  
Biokinetic Model

Design Methodology of Free Water Surface Constructed Wetlands

2004 ◽  
Vol 18 (6) ◽  
pp. 541-565 ◽  
Author(s):  
Maria A. Economopoulou ◽  
Vassilios A. Tsihrintzis
Keyword(s):  
Constructed Wetlands ◽  
Water Surface ◽  
Design Methodology ◽  
Free Water ◽  
Free Water Surface

PERIODIC DRAINING REDUCES MOSQUITO EMERGENCE FROM FREE-WATER SURFACE CONSTRUCTED WETLANDS

2004 ◽  
Vol 47 (2) ◽  
pp. 567-573 ◽  
Author(s):  
C. R. Mayhew ◽  
D. R. Raman ◽  
R. R. Gerhardt ◽  
R. T. Burns ◽  
M. S. Younger
Keyword(s):  
Constructed Wetlands ◽  
Water Surface ◽  
Free Water ◽  
Free Water Surface
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