Oxygen demand, nitrogen and copper removal by free-water-surface and subsurface-flow constructed wetlands under tropical conditions

2001 ◽  
Vol 26 (5-6) ◽  
pp. 425-431 ◽  
Author(s):  
P.E. Lim ◽  
T.F. Wong ◽  
D.V. Lim
Keyword(s):  
Constructed Wetlands ◽  
Water Surface ◽  
Subsurface Flow ◽  
Oxygen Demand ◽  
Free Water ◽  
Copper Removal ◽  
Free Water Surface ◽  
Tropical Conditions ◽  
Subsurface Flow Constructed Wetlands ◽  
Surface And Subsurface Flow

Use of constructed wetlands in water pollution control: historical development, present status, and future perspectives

1994 ◽  
Vol 30 (8) ◽  
pp. 209-223 ◽  
Author(s):  
Hans Brix
Keyword(s):  
Water Pollution ◽  
Constructed Wetlands ◽  
Pollution Control ◽  
Historical Development ◽  
Water Surface ◽  
Subsurface Flow ◽  
Free Water ◽  
Water Pollution Control ◽  
Free Water Surface ◽  
Flow Systems

During the last two decades the multiple functions and values of wetlands have been recognized not only by the scientists and managers working with wetlands, but also by the public. The ability of wetlands to transform and store organic matter has been exploited in constructed wetlands. This paper summarizes the state-of-the-art of the uses of constructed wetlands in water pollution control by reviewing the basics of the technology, the historical development, and the performance expectations with focus on the use of free water surface and subsurface flow constructed wetlands for municipal wastewater treatment. Performance data from a total of 104 subsurface flow systems and 70 free water surface flow systems are reviewed. The present state of knowledge is sufficient to apply constructed wetlands as a tool for improving water quality. The potential applications range from secondary treatment of municipal and various types of industrial wastewaters to polishing of tertiary treated waters and diffuse pollution. In many situations constructed wetlands is the only appropriate technology available. The treatment capacity of subsurface flow systems can be improved by selecting vertical flow systems with intermittent loading, by proper media selection, and by recycling of the wastewater. Further research is needed to help define and optimize engineering design criteria and the long-term performance capabilities and operational problems.

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.

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
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