Showing results for: constructed wetland Articles
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Q&A To Constructed Wetlands
The booklet "Q&A To Constructed Wetlands" provides a better understanding on the use of constructed wetlands to treat wastewater as compared to conventional methods. This booklet was jointly produced by The National Hydraulic Research Institute of Malaysia (NAHRIM) and Wetlands International, Malaysia. Description: Constructed Wetlands are artificial wastewater treatment systems consisting ...
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Water balance: case study of a constructed wetland as part of the bio-ecological drainage system (BIOECODS)
The Bio-ecological Drainage System, or BIOECODS, is an urban drainage system located at the Engineering Campus, Universiti Sains Malaysia. It consists of a constructed wetland as a part of the urban drainage system to carry storm water in a closed system. In this closed system, the constructed wetland was designed particularly for further treatment of storm water. For the purpose of studying the ...
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Effects of HRT on the efficiency of denitrification and carbon source release in constructed wetland filled with bark
Constructed wetland is widely used to treat municipal sewage. However, lack of carbon source always constraints the application of constructed wetland in advanced tailwater treatment process. Bark was used as the filler and external carbon source of constructed wetland in the study, and the effects of hydraulic retention time (HRT) on NO3−−N removal efficiency and carbon release velocity were ...
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Study of oyster shell as a potential substrate for constructed wetlands
We tested the suitability of oyster shell (OS) as a substrate for phosphorus removal in constructed wetlands (CWs) treating swine wastewater. OS is proven to have a significant phosphorus adsorption capacity; significant phosphorus removal was achieved in vertical subsurface flow constructed wetlands (VSSFs) that were filled with OS and used to treat swine wastewater. In the VSSF system, OS ...
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Influence of earthworm
Eisenia fetida onIris pseudacorus's photosynthetic characteristics, evapotranspiration losses and purifying capacity in constructed wetland systemsFour constructed wetland systems were studied to investigate the effects of adding Eisenia fetida on the purifying capacity of constructed wetlands. Addition of E. fetida increased the photosynthetic rate (Pn), transpiration rate (Tr) and chlorophyll meter value of leaves of Iris pseudacorus L. in the constructed wetlands by 16, 35 and 7%, respectively. Compared with the substrate only ...
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Phosphorus removal by apatite in horizontal flow constructed wetlands for small communities: pilot and full-scale evidence
Phosphorus (P) removals in constructed wetlands (CWs) have received particular attention in recent decades by using specific materials which promote adsorption/precipitation mechanisms. Recent studies have shown interest in using apatite materials to promote P precipitation onto the particle surface. As previous trials were mainly done by lab experiments, this present study aims to evaluate the ...
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Influence of substrate depth and particle size on phosphorus removal in a surface flow constructed wetland
Substrate adsorption is one of the main processes by which redundant phosphorus is removed from wastewater in surface flow constructed wetlands (SFCWs). The physical properties of the substrate, such as depth and particle size, will influence the amount of phosphorus adsorption. This study was carried out in a long-running intermittent inflow constructed wetland that covered a total area of ...
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French vertical flow constructed wetlands: a need of a better understanding of the role of the deposit layer
French vertical flow constructed wetlands, treating directly raw wastewater, have become the main systems implemented for communities under 2,000 population equivalent in France. Like in sludge drying reed beds, an organic deposit layer is formed over time at the top surface of the filter. This deposit layer is a key factor in the performance of the system as it impacts hydraulic, gas ...
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Waste Stabilization Ponds and Constructed Wetlands - Design Manual, 2005
The design manual for waste stabilization ponds and constructed wetlands presented in this CD ROM gives a comprehensive technical information about their planning, design and operation. Also a number of numerical models are included to assist in finding the size of a constructed wetland or stabilization pond, reduce the concentration of heavy metals, phosphorous and nitrogen amongst other ...
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CE Marking and declaration of conformity for constructed wetlands for up to 50 PT built in series exemplary explained with the initial type test of the treatment efficiency performance
Small constructed wetlands for up to 50 PT built in series are subject to two different fields of law. To place the product on the European market the construction law has to be respected and the product usually needs to be CE-marked. To operate such a plant and discharge the treated wastewater, the national water law needs to be respected and in some countries national approvals are ...
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Study of oyster shell as a potential substrate for constructed wetlands
We tested the suitability of oyster shell (OS) as a substrate for phosphorus removal in constructed wetlands (CWs) treating swine wastewater. OS is proven to have a significant phosphorus adsorption capacity; significant phosphorus removal was achieved in vertical subsurface flow constructed wetlands (VSSFs) that were filled with OS and used to treat swine wastewater. In the VSSF system, OS ...
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Study of constructed wetlands effluent disinfected with ozone
The purpose of this research was to study the disinfection of sanitary effluent from constructed wetlands, evaluating the oxidation of organic matter, the formation of formaldehyde, as well as the efficiency of total coliforms and Escherichia coli inactivation. A constant flow of ozone was applied to the batch system in 5 and 10 mg.O3 L−1 doses with contact times of 5 and 10 min. This ...
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Effects of open water on the performance of a constructed wetland for nonpoint source pollution control
The seasonal performance of four differently configured constructed wetland systems was compared for the treatment efficiency of nonpoint source pollution. Dead plants in the constructed wetlands increased the nitrogen removal rate during winter by providing organic carbon, which is essential for the denitrification process. However, when the wetlands released phosphorus from the dead plants, the ...
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Vertical Flow Constructed Wetlands
The constructed wetland technology is today continuously evolving with new and innovative applications. Vertical flow constructed wetlands is a relatively new and still developing technology in the field of ecological and environmental engineering. These ecological systems offers us the potential to treat water and sludge in a more sustainable way, even when financial sources are limited. The ...
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Spatial pattern analysis for water quality in free-surface constructed wetland
Free-surface constructed wetlands are known as a low-energy green technique to highly decrease a wide range of pollutants in wastewater and stormwater before discharge into natural water. In this study, two spatial analyses, principal factor analysis and hierarchical cluster analysis (HACA), were employed to interpret the effect of wetland on the water quality variables (WQVs) and to classify ...
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Predicting Sustainable Ground Water to Constructed Riparian Wetlands: Shaker Trace, Ohio, USA
Water isotopy is introduced as a tool to design, locate, and select storm water best management practices for the prediction of sustained ground water inflows to prospective constructed wetlands. A primer and application of the stable isotopes, 18O and 2H, are discussed for riparian wetland restoration areas among an agricultural landscape in southwestern Ohio. Conventional piezometric ...
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Numerical modelling: a tool for better constructed wetland design?
There is a need for a simplified computer-based design tool for subsurface flow constructed wetlands (CWs) which is based on process-based numerical models. Parameters of existing design guidelines and rules have been derived from experiments under specific conditions. Therefore designing CWs using these parameters is limited to these conditions (i.e. temperature, wastewater composition, filter ...
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Winery and distillery wastewater treatment by constructed wetland with shorter retention time
The rationale for using constructed wetlands for treating wastewater is that wetlands are naturally among the most biological active ecosystem on earth. The aim of the study was to determine the impact of shorter retention time on the performance of constructed wetland in terms of Chemical Oxygen Demand (COD) and other elements removal. The application of wastewater with retention time of seven ...
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Global supply of freshwater: the role of treatment wetlands
In 2000, humans used approximately 60% of run-off that is geographically and temporally accessible. With projected increases in population, humans may use between 72-99% (depending on whether per capita increases are factored) of accessible run-off by 2025, even accounting for new dam construction. Wetlands have the capability to filter polluted water and could therefore potentially affect access ...
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Constructed Wetlands I
Traditional constructed wetland are shallow planted basins for cleaning anthropogenic discharges (wastewater or polluted runoff). They were used for cleaning of: domestic wastewater agricultural wastewater coal mine drainage stormwater runoff The main construction elements were: inflow ( e.g. sedimentation part) substrat (soil or gravel) with plants (marsh or water plants) discharge ...
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