Showing results for: wetland construction Articles
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Are constructed treatment wetlands sustainable sanitation solutions?
The main objective of sanitation systems is to protect and promote human health by providing a clean environment and breaking the cycle of disease. In order to be sustainable, a sanitation system has to be not only economically viable, socially acceptable and technically and institutionally appropriate, but it should also protect the environment and the natural resources. ...
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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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Modelling removal of microbiological contaminants along a series of constructed wetlands
The rate of removal of microbial pollutants along a series of constructed wetlands for treating wastewater in Covenant University, Ota, Nigeria were monitored from inlet to the discharge point into river Atuara and at 300 m upstream and downstream. The microbiological test results analysed were those of most probable number (MPN) of coliforms ( Escherichia coli ), coliform counts in cfu/100 ...
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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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High Pb concentration stress on
Typha latifolia growth and Pb removal in microcosm wetlandsWhen constructed wetlands are used to treat high-Pb wastewater, Pb may become a stress to wetland plants, which subsequently reduces treatment performance and the other ecosystem services. To facilitate the design and operation of constructed wetlands for treatment of Pb-rich wastewater, we investigated the irreversible inhibitory level of Pb for Typha latifolia through experiments in microcosm ...
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Reed Beds
Naturally occurring wetlands have a natural, innate ability to remediate contaminants from water. Over the decades BritishFlora have supplied many millions of reeds, Phragmites communis, for both habitat creation projects such as bird reserves to attract bittern, bearded tit and water rails, to name but a few. Common Reed is commonly planted to help with the cleaning of contaminated water due to ...
By BritishFlora
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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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Using a constructed wetland for non-point source pollution control and river water quality purification: a case study in Taiwan
The Kaoping River Rail Bridge Constructed Wetland, which was commissioned in 2004, is one of the largest constructed wetlands in Taiwan. This multi-function wetland has been designed for the purposes of non-point source (NPS) pollutant removal, wastewater treatment, wildlife habitat, recreation, and education. The major influents of this wetland came from the local drainage trench containing ...
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Treatment of Polluted River Water Using Pilot-Scale Constructed Wetlands
From 1970S TO 1980S, the Constructed Wetland (CW) technique has already been rapidly developed and widely applied in more than 10 countries, such as USA, Australia and countries, such as USA, Australia and countrien in Europe (Amelia, 2000; Brown, et al. 1994; Haberl, et al., 1995). Nowadays, there have been about 5000 CWs technics have substituted for the traditional secondary or advanced ...
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Chloride ion transport and fate in oilfield wastewater reuse by interval dynamic multimedia aquivalence model
A surface flow constructed wetland was built up to dispose of oilfield wastewater with a high level of inorganic salt ions. Chlorine ion (Cl−) was selected as an indicator of soil secondary salinization, and an interval dynamic multimedia aquivalence (IDMA) model was developed to investigate the dynamic multimedia environmental (air, water, soil, flora, and groundwater) effects of ...
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Comparative research on phosphorus removal by pilot-scale vertical flow constructed wetlands using steel slag and modified steel slag as substrates
This research mainly focused on the phosphorus removal performance of pilot-scale vertical flow constructed wetlands with steel slag (SS) and modified steel slag (MSS). First, bench-scale experiments were conducted to evaluate the phosphorus adsorption capacity. Results showed that the Langmuir model could better describe the adsorption characteristics of the two materials; the maximum ...
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Microbial diversity and community composition in recirculating vertical flow constructed wetlands
Microorganisms constitute a central component of constructed wetlands (CWs), playing a major role in these systems' capacity for treating wastewater. The aim of this study was to determine the diversity and composition of the microbial community found in a recirculating vertical flow CW (RVFCW) bed fed with primarily settled domestic wastewater and its response to the presence of plants, season ...
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Distribution characteristics of ammonia-oxidizing bacteria in the Typha latifolia constructed wetlands using fluorescent in situ hybridization (FISH)
A molecular biology method, fluorescent in situ hybridization (FISH), in which the pre-treatment was improved in allusion to the media of the constructed wetlands (CW), e.g. the soil and the grit, was used to investigate the vertical distribution characteristics of ammonia-oxidizing bacteria (AOB) quantity and the relation with oxidation-reduction potential (ORP) in the Typha latifolia ...
By IOS Press
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Effect of diffusional mass transfer on the performance of horizontal subsurface flow constructed wetlands in tropical climate conditions
The effect of mass transfer on the removal rate constants of BOD5, NH3, NO3 and TKN has been investigated in a Horizontal Subsurface Flow Constructed Wetland (HSSFCW) planted with Phragmites mauritianus. The plug flow model was assumed and the inlet and outlet concentrations were used to determine the observed removal rate constants. Mass transfer effects were studied by assessing the influence ...
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Integrated constructed wetlands: water management as a land-use issue, implementing the ‘Ecosystem Approach’
Awareness of the need for social, economic and environmental coherence in the management of water is becoming evermore apparent. Water supply as well as treatment is becoming more costly; a challenge that is not only limited to developing countries. The use of wetlands, natural and constructed, is now more widely accepted as a means of tackling a range of problems in water management to deliver ...
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Constructed wetland using corncob charcoal substrate: pollutants removal and intensification
To investigate the feasibility of using corncob charcoal substrate in constructed wetlands, four laboratory-scale vertical flow constructed wetlands (VFCWs) were built. Effluent pollutant (chemical oxygen demand (COD), NH4+-N, total phosphorus (TP)) concentrations during the experiment were determined to reveal pollutant removal mechanisms and efficiencies at different stages. In the stable ...
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Effect of recirculation on organic matter removal in a hybrid constructed wetland system
This research project aimed to determine the technologically feasible and applicable wastewater treatment systems which will be constructed to solve environmental problems caused by small communities in Turkey. Pilot-scale treatment of a small community's wastewater was performed over a period of more than 2 years in order to show applicability of these systems. The present study involves removal ...
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Relationships between landscape pattern, wetland characteristics, and water quality in agricultural catchments
Water quality in streams is dependent on landscape metrics at catchment and wetland scales. A study was undertaken to evaluate the correlation between landscape metrics, namely patch density and area, shape, heterogeneity, aggregation, connectivity, land-use ratio, and water quality variables (salinity, nutrients, sediments, alkalinity, other potential pollutants and pH) in the agricultural areas ...
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Constructed wetland system for treating wastewater of scattered small industries: a case study of fermented fish production industry in Phayao City, Thailand
In the absence of centralised treatment systems and collection networks, wastewater discharged by small industries often end up in surface waterbodies. When those industries are scattered in a wider area, decentralised systems are also not effective in solving the problem. This paper presents the results of a community-based project that was implemented to demonstrate how wastewater problem of ...
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Biological Cr(VI) removal using bio-filters and constructed wetlands
The bioreduction of hexavalent chromium from aqueous solution was carried out using suspended growth and packed-bed reactors under a draw-fill operating mode, and horizontal subsurface constructed wetlands. Reactors were inoculated with industrial sludge from the Hellenic Aerospace Industry using sugar as substrate. In the suspended growth reactors, the maximum Cr(VI) reduction rate (about 2 ...
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