Showing results for: wetland Articles
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Comparison between polishing (maturation) ponds and subsurface flow constructed wetlands (planted and unplanted) for the post-treatment of the effluent from UASB reactors
This paper presents the results of a comparison of the performance of two treatment systems operating in parallel, with the same influent wastewater. The investigated systems are (i) UASB + three polishing ponds in series + coarse filter (200 population equivalents) and (ii) UASB + subsurface flow constructed wetlands (50 population equivalents). Two wetland units, operating in parallel, were ...
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Using wetland plants in nutrient removal from municipal wastewater
In this study, three wetland plant species (phragmites australis, typha and rush) were planted in separate cells to evaluate the proportion of total nitrogen (TN) and total phosphorus (TP) removal attributed to storage in plants. Four cells were considered for each plant to be tested in a completely randomised design having four replications. Results show that the uptakes of nutrients by rush, ...
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Tech-IA floating system introduced in urban wastewater treatment plants in the Veneto region – Italy
The performance of three integrated wetland treatment plants (horizontal sub-surface flow (h-SSF) and floating treatment wetland (FTW) with differentiated primary treatments) designed for treating domestic wastewater was investigated, monitoring total (TN), nitrate (NO3-N), nitrite (NO2-N) and ammonia nitrogen (NH4-N), total (TP) and phosphate phosphorus (PO4-P), chemical (COD) and biological ...
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Phosphorus retention capacity in red ferralitic soil
In this study the main physical–chemical characteristics of red ferralitic soil to use as substrate in subsurface wetlands was determined. The P-removal was evaluated in a short-term isotherm batch experiment and in a column percolation experiment. The acid characteristic and high content of iron minerals in the red ferralitic soil facilitated the phosphorus removal. Also the sorption ...
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Influence of design, physico-chemical and environmental parameters on pharmaceuticals and fragrances removal by constructed wetlands
The ability of several mesocosm-scale and full-scale constructed wetlands (CWs) to remove pharmaceuticals and personal care products (PPCPs) from urban wastewater was assessed. The results of three previous works were considered as a whole to find common patterns in PPCP removal. The experiment took place outdoors under winter and summer conditions. The mesocosm-scale CWs differed in some design ...
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Constructed wetlands for wastewater and activated sludge treatment in north Greece: a review
Constructed wetlands used for the treatment of urban, industrial and agricultural wastewater have become very popular treatment systems all over the world. In Greece, these systems are not very common, although the climate is favourable for their use. During recent years, there have been several attempts for the implementation of these systems in Greece, which include, among others, pilot-scale ...
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Removal of nutrients from secondary-treated municipal wastewater in wetland microcosms using ornamental plant species
Different wetland species may have a differential capacity to take up nutrients from wastewater in the process of tertiary water purification. Ten emergent plant species, including six ornamental species and four rush species were planted in the vertical-flow wetland microcosms and fed a simulated wastewater solution containing 17.5 mg N l−1 in the 1:1 proportion of NH4+-N and NO3&minus-N, and 10 ...
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Comparison of vertical and horizontal flow planted and unplanted subsurface flow wetlands treating municipal wastewater
In the search for design criteria for constructed wetlands (CWs) in Nepal a semi-scale experimental setup including horizontal flow (HF) and vertical flow (VF) CWs was developed. This paper compares the performance of HF and VF wetlands, and planted with unplanted beds. The experimental setup consists of two units of HF and VF beds of size 6 m × 2 m × 0.6 m and 6 m × 2 m ...
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Disinfection capacity of seven constructed wetlands and ponds
The disinfection performance of three subsurface flow constructed wetlands (SSF), a free-water surface-constructed wetland and three ponds were investigated. They functioned as advanced treatment stage following treatment in a large municipal wastewater treatment plant equipped with nutrient removal. Despite low influent concentrations of 103.9/100 mL, Escherichia coli underwent a reduction of ...
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Large scale application of French reed beds: municipal wastewater treatment for a 20,000 inhabitant's town in Moldova
A two-stage vertical flow treatment wetlands system (French reed beds) was realized in 2012–2013 for the Orhei's town in Moldova. The treatment system occupies a total area of about 5 ha and operates in cold climate conditions during winter, with air temperatures below −20 °C. The first 2 years (2013–2015) of treatment performances for this system are presented here, with a particular ...
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Domestic wastewater treatment with CEPT-wetlands process
This study aimed to develop an effective process with less construction and operation cost and with flexibility of meeting different temperature requirements, namely CEPT-construted wetland processes. To reduce the chemical cost for the CEPT process, fly ash was firstly utilised to develop an efficient compound coagulant. The lab-scale experimental results showed that with low Fly Ash Coagulant ...
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Alum application to improve water quality in a municipal wastewater treatment wetland
Received for publication January 18, 2008. Nutrient removal in treatment wetlands declines during winter months due to temperature. A 3-mo (wintertime) mesocosm study was conducted to determine the effectiveness of alum in immobilizing P as well as other nutrients during this period of reduced treatment efficiency. Eighteen mesocosms, triplicate alum, and three controls or no alum were ...
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Constructed wetlands as an alternative restoration measure for shallow lakes
This paper deals with the consequences of cultural eutrophication and unconventional solutions for shallow lake restoration. Cultural eutrophication is the primary problem that affects especially shallow lakes, due to their physical characteristics (e.g. shallow depth, lack of stratification). Palic Lake, a very shallow Pannonian lake, received treated municipal wastewaters coming from the ...
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Pollutant removal in a multi-stage municipal wastewater treatment system comprised of constructed wetlands and a maturation pond, in a temperate climate
A multi-stage municipal wastewater treatment system is proposed to comply with Mexican standards for discharge into receiving water bodies. The system is located in Santa Fe de la Laguna, Mexico, an area with a temperate climate. It was designed for 2,700 people equivalent (259.2 m3/d) and consists of a preliminary treatment, a septic tank as well as two modules operating in parallel, each ...
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Characteristics of nitrogen and phosphorus removal by a surface-flow constructed wetland for polluted river water treatment
The characteristics of nitrogen (N) and phosphorus (P) removal were studied during the 2-year operation of a free water surface flow wetland of 900 m2 with hydraulic loading of 0.1 m/d to evaluate its potential to treat water from an urban stream polluted with municipal and industrial wastewater. Attention was focused on the removal of dissolved N and P by harvesting plants (local Phragmites ...
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A promising approach of reject water treatment using a tidal flow constructed wetland system employing alum sludge as main substrate
This study examined a novel reuse of alum sludge, an inescapable by-product of drinking water treatment process when aluminium salt is added as a coagulant, as the main medium in a laboratory-scale multi-stage constructed wetland (CW) system for reject water treatment. Such reject water is a main concern in municipal wastewater treatment plant (MWWTP) for increasing the organic and nutrient ...
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Academic Research Projects
The Centre for Alternative Wastewater Treatment (CAWT), Fleming College The Centre for Alternative Wastewater Treatment (CAWT) is a research facility within Fleming College, Canada. The CAWT focuses on constructed wetland research whereby wetlands are evaluated for their effectiveness in treating municipal wastewater. Our ColiPlate™ water testing system has been used on a routine ...
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WWTP Georgia, USA - A Case Study
Case Study: Municipal WWTPClient: Georgia – USAStart Up: 2009Capacity: 1,900 m3/d Overview The extensive municipal WWTP was required to upgrade its effluent quality to include extensive Ammonia removal. The project was conducted by Aqwise’s partner in North America, Siemens Water Technologies Corp. Requirement The city of Folkston, Georgia, needed to upgrade its lagoon system to meet new ...
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Technical-economical analysis of selected decentralized technologies for municipal wastewater treatment in the city of Rome
Several wastewater treatment technologies were evaluated as alternative systems to the more traditional centralized continuous flow system to serve decentralized areas of the city of Rome (Italy). For instance, the following technologies were selected: (1) Constructed wetlands, (2) Membrane Biological Reactor, (3) Deep Shaft, (4) Sequencing Batch Reactor, and (5) Combined Filtration and ...
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Phylogenetic comparison of the methanogenic communities from an acidic, oligotrophic fen and an anaerobic digester treating municipal wastewater sludge
Methanogens play a critical role in the decomposition of organics under anaerobic conditions. The methanogenic consortia in saturated wetland soils are often subjected to large temperature fluctuations and acidic conditions, imposing a selective pressure for psychro- and acidotolerant community members; however, methanogenic communities in engineered digesters are frequently maintained ...
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