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Dissertations / Theses on the topic 'Surface flow constructed wetlands'

Author: Grafiati

Published: 9 March 2023

Last updated: 30 July 2025

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1

Demin, Oleg Alexandrovich. "Remediation of ammonia rich minewater in constructed wetlands." Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268403.

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Ibrahim, Hend Mohammad Saad. "Wastewater treatment and plant performance in surface flow constructed wetlands." Doctoral thesis, Università degli studi di Padova, 2018. http://hdl.handle.net/11577/3422794.

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Most of the industrial and agricultural wastewaters in Veneto, north Italy are conveyed to the Venetian lagoon through its drainage basin; mainly as nitrogen (N) and phosphorus (P) in addition to other pollutants such as heavy metals. In 2000, the total N load was one-third higher than the maximum allowable reference value of 3000 t/year for lagoon inputs as indicated by the Ministerial decree (Ministero dell’Ambiente, 1999), while the total P was 229 t/year. Based on this, inputs of nitrogen into the Venetian Lagoon system must be reduced dramatically in the near future, or at least the maxim

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3

Khan, Imran. "Effects of hydraulic load on nitrate removal in surface-flow constructed wetlands." Thesis, Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-15148.

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Abstract Constructed wetlands had been widely used as economical and environment friendly treatment systems for agriculture runoff in southwest Sweden to limit the transport of nutrients to Kattegat, thereby aiding in the effort of abating eutrophication. The extensive use and acceptance of wetlands as treatment systems had been an incentive to develop performance models. Even recent studies showed that first order models are inadequate to guide the design of constructed wetlands, these are still commonly used. The main assumption of such models is tested here, which states that the removal ra

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4

Butterworth, Eleanor. "The use of artificial aeration in horizontal sub-surface flow constructed wetlands for tertiary nitrification." Thesis, Cranfield University, 2014. http://dspace.lib.cranfield.ac.uk/handle/1826/8642.

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Increased treatment capability is required on small sewage treatment works to meet ammonium consents that are tightening to effluent concentrations of below 5 mg[Ammonical nitrogen (mg/L)] and in some cases as low as 0.5mg[Ammonical nitrogen (mg/L)] Optimisation of existing assets is preferential over the addition or expansion of the works to minimise associated costs and energy usage. Many small works in the UK currently employ horizontal sub-surface flow constructed wetlands (HSSF CWs) that have restricted capability to nitrify due to limited oxygen transfer and as such artificial aeration h

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5

Kurup, Rajendra G. "An experimental research on application of sub-surface flow constructed wetlands for meat processing industry effluent treatment and nutrient removal /." Access via Murdoch University Digital Theses Project, 2007. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20070717.142408.

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au, rkurup@murdoch edu, and Rajendra Kurup. "An experimental research on application of sub-surface flow constructed wetlands for meat processing industry effluent treatment and nutrient removal." Murdoch University, 2007. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20070717.142408.

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Meat processing industries produce large volumes of high strength wastewater. Conventional technologies used in Australia and similar countries for treatment of effluent from meat processing and similar industries, such as wineries and processed food industry, are treatment ponds with or without a mechanical treatment system. A properly designed activated sludge treatment system would be capable of biological removal of phosphorus and nitrogen in addition to BOD5. These systems, however, require substantial electrical power, skilled operational support and produce large quantities of biosolid

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Kurup, Rajendra. "An experimental research on application of sub-surface flow constructed wetlands for meat processing industry effluent treatment and nutrient removal." Thesis, Kurup, Rajendra (2007) An experimental research on application of sub-surface flow constructed wetlands for meat processing industry effluent treatment and nutrient removal. PhD thesis, Murdoch University, 2007. https://researchrepository.murdoch.edu.au/id/eprint/137/.

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Meat processing industries produce large volumes of high strength wastewater. Conventional technologies used in Australia and similar countries for treatment of effluent from meat processing and similar industries, such as wineries and processed food industry, are treatment ponds with or without a mechanical treatment system. A properly designed activated sludge treatment system would be capable of biological removal of phosphorus and nitrogen in addition to BOD5. These systems, however, require substantial electrical power, skilled operational support and produce large quantities of biosol

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8

Kurup, Rajendra. "An experimental research on application of sub-surface flow constructed wetlands for meat processing industry effluent treatment and nutrient removal." Kurup, Rajendra (2007) An experimental research on application of sub-surface flow constructed wetlands for meat processing industry effluent treatment and nutrient removal. PhD thesis, Murdoch University, 2007. http://researchrepository.murdoch.edu.au/137/.

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Meat processing industries produce large volumes of high strength wastewater. Conventional technologies used in Australia and similar countries for treatment of effluent from meat processing and similar industries, such as wineries and processed food industry, are treatment ponds with or without a mechanical treatment system. A properly designed activated sludge treatment system would be capable of biological removal of phosphorus and nitrogen in addition to BOD5. These systems, however, require substantial electrical power, skilled operational support and produce large quantities of biosol

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9

Alm, Max-Bernhard. "Flow pattern analysis of a Surface Flow Constructed Wetland : Treating surface runoff and landfill leachate water from the Löt waste management site." Thesis, KTH, Hållbar utveckling, miljövetenskap och teknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-285896.

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The waste management and recycling company, Söderhalls Renhållningsverk (SÖRAB) have constructed a surface flow wetland in order to treat surface runoff from the waste management site, Löt. The contaminated water passes several treatment steps until it reaches the wetland and a subsequent soil infiltration step. It is suspected that the flow path of the water through the wetland is short-circuited which may result in a reduced treatment efficiency. The current discharge concentrations of the chemical compounds tested for do not exceed the allowed discharge limits. However, it is of interes

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10

Bodin, Hristina. "Wastewater treatment in constructed wetlands : Effects of vegetation, hydraulics and data analysis methods." Doctoral thesis, Linköpings universitet, Biologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-91402.

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Degradation of water resources has become one of the most pressing global concerns currently facing mankind. Constructed Wetlands (CWs) represent a concept to combat deterioration of water resources by acting as buffers between wastewater and receiving water bodies. Still, constructing wetlands for the sole purpose of wastewater treatment is a challenging task. To contribute to this research area, the fundamental question raised in this doctorate thesis was: how do factors such as vegetation and residing water movements (hydraulics) influence wastewater treatment in CWs? Also, effects of diffe

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Hummel, Adelaide Pereira. "Field Development and Performance Evaluation of a Constructed Wetland System in the Tropics." FIU Digital Commons, 2013. http://digitalcommons.fiu.edu/etd/1218.

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This study is part of a project that was conducted by Florida International University (FIU), which designed, built, and characterized a constructed wetland (CW) wastewater treatment system in El Salvador, Central America. This study focuses on the detailed performance of a field-scale CW in the tropics, consisting of a subsurface flow wetland (SSF) and a surface flow wetland (SF). The SSF had a total area of 151.2 sq. m., filled with gravel and planted with Phragmites, Thalia, and Brachiaria, along three independent cells operating with a flow in parallel and receiving the influent domestic w

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Wei, Xiaochen. "Biodiversity Survey and Surface Flow Constructed Wetland Design to Help Control Agricultural Non-point Source Pollution in Poyang Lake Basin, China." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1385989072.

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13

Warmt-Murray, Marco. "The effect of polymer contaminated oil produced wastewater on the growth and health of five emergent macrophytes in a pilot scale surface flow constructed wetland." Thesis, Warmt-Murray, Marco (2015) The effect of polymer contaminated oil produced wastewater on the growth and health of five emergent macrophytes in a pilot scale surface flow constructed wetland. Other thesis, Murdoch University, 2015. https://researchrepository.murdoch.edu.au/id/eprint/29835/.

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A Water Treatment Plant (WTP) located in the south east Arabian Peninsula currently receives oil produced wastewater (PW) from local oilfields. Hydrocarbons are biologically treated/degraded within a series of vegetated surface flow constructed wetlands (SF CW) and then water is evaporated in large evaporation ponds. Over the next 5 years there are plans to increase the efficiency of oil production by injecting partially hydrolyzed polyacrylamide (HPAM) into oil fields located in the Middle East, raising oil production up to 12%. The broad aim of this report is to determine if the WTP will be

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Tolomio, Massimo. "Evaluation of long-term water management strategies for saving water and reducing nitrogen and phosphorus losses from agricultural fields: controlled drainage and surface flow constructed wetland case studies in Venice Lagoon drainage basin." Doctoral thesis, Università degli studi di Padova, 2018. http://hdl.handle.net/11577/3421846.

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In in contesto di carenza idrica e di inquinamento delle acque superficiali causato dalle attività agricole, devono essere identificate nuove pratiche di gestione delle risorse idriche che rispondano a queste problematiche e possano essere utilizzate in diversi ambienti. Il bacino idrografico della Laguna di Venezia (nell'Italia nord-orientale) è un'area sensibile all'inquinamento delle acque superficiali. La prevalenza di terreni pianeggianti e la presenza di una falda freatica superficiale, tuttavia, suggeriscono condizioni idonee per la realizzazione di due pratiche di gestione idrica per

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15

Melton, Rebecca Hobbs. "BOD5 removal in subsurface flow constructed wetlands." Texas A&M University, 2003. http://hdl.handle.net/1969.1/2301.

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The frequency of on-site systems for treatment of domestic wastewater is increasing with new residential development in both rural and low-density suburban areas. Subsurface flow constructed wetlands (SFCW) have emerged as a viable option to achieve advanced or secondary treatment of domestic wastewater. The pollutant removal efficiency in SFCW depends on design parameters. Many of these factors have been investigated while others such as aspect ratio, design of water inlet structure and method of dosing the wetland have yet to be fully examined. This study examined the effect of aspect ratio

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Knowles, Paul. "Clogging in horizontal subsurface flow constructed wetlands." Thesis, Aston University, 2012. http://publications.aston.ac.uk/18725/.

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Horizontal Subsurface Flow Treatment Wetlands (HSSF TWs) are used by Severn Trent Water as a low-cost tertiary wastewater treatment for rural locations. Experience has shown that clogging is a major operational problem that reduces HSSF TW lifetime. Clogging is caused by an accumulation of secondary wastewater solids from upstream processes and decomposing leaf litter. Clogging occurs as a sludge layer where wastewater is loaded on the surface of the bed at the inlet. Severn Trent systems receive relatively high hydraulic loading rates, which causes overland flow and reduces the ability to min

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17

Rivard, Stephanie. "Evaluation of Continuous Flow Constructed Wetlands Treating Swine Waste." TopSCHOLAR®, 1997. http://digitalcommons.wku.edu/theses/352.

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The ability for wetlands to purify contaminated water is not a new concept. Natural wetlands have been cleansing water within our environment for ages. After studying the process of natural wetlands the same concept was applied to municipal waste. It is the success of constructed wetlands treating municipal waste that created the new idea for the application of a wetland system to treat wastewater from livestock facilities. Through proper design and management, constructed wetlands may be useful for reducing the nutrient concentration of waste (Rieck el al., 1996). Taking into consideration th

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Nokes, Rita Lynn. "Reduction of enteric organisms in small scale, subsurface flow constructed wetlands." Thesis, The University of Arizona, 1998. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu_etd_hy0280_sip1_w.pdf&type=application/pdf.

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Mustafa, Atif. "Nutrient removal with integrated constructed wetlands : microbial ecology and treatment performance evaluation of full-scale integrated constructed wetlands." Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/4111.

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Wastewaters from intensive agricultural activities contain high concentrations of nitrogen and phosphorus that contributes to water management problems. During the past few years, there has been considerable interest in the use of constructed wetlands for treating surface water runoff from farmyards. If the contaminated runoff is not treated, this wastewater along with other non-point sources of pollution can seriously contaminate the surface water and groundwater. Integrated Constructed Wetlands (ICWs) are a type of free water surface wetlands. They are engineered systems that are designed, c

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Domingos, Sergio S. "Vertical flow constructed wetlands for the treatment of inorganic industrial wastewater." Thesis, Domingos, Sergio S. (2011) Vertical flow constructed wetlands for the treatment of inorganic industrial wastewater. PhD thesis, Murdoch University, 2011. https://researchrepository.murdoch.edu.au/id/eprint/7300/.

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The focus of this thesis is primarily on nitrogen removal and secondarily on heavy metal accumulation in unsaturated and saturated vertical flow constructed wetlands (VFCWs) treating inorganic industrial wastewater. This thesis is divided into an experimental component and a case study component. Three research themes are presented within the scope of this thesis. The first theme involves the study of nitrification and denitrification and the characterisation of the respective bacterial communities in unsaturated and semi-saturated VFCWs. The identification of functional bacteria with the aid

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Nowak, Katarzyna. "Carbon storage in free water surface constructed wetlands in southern Sweden." Thesis, Högskolan i Halmstad, Akademin för företagande, innovation och hållbarhet, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-45070.

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Background: Wetlands store significant amounts of carbon through plant respiration and anaerobic peat formation, however, there is little knowledge on which factors affect the carbon storage distribution within wetlands. Aims: To determine how much carbon and nitrogen wetlands can store over time and whether there are patterns of high and low carbon and nitrogen storage within wetlands. Methods: Peat samples of a defined volume, cut out from three constructed wetlands were dried, weighed and analysed for their carbon and nitrogen content. To determine whether there are any patterns in carbon a

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De, Carvalho Baptista Joana. "Microbial mechanisms of carbon removal in laboratory-scale subsurface flow constructed wetlands." Thesis, University of Newcastle Upon Tyne, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270173.

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Davila, Pablo Arturo Yelderman Joe C. "The evaluation of a subsurface-flow constructed wetland for on-site wastewater treatment under the NSF/ANSI Standard 40 protocol design loading." Waco, Tex. : Baylor University, 2006. http://hdl.handle.net/2104/4957.

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Pedescoll, Albacar Anna. "Clogging in horizontal subsurface flow constructed wetlands: mesures, design factors and prevention strategies." Doctoral thesis, Universitat Politècnica de Catalunya, 2010. http://hdl.handle.net/10803/108721.

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Constructed wetlands are alternative systems to conventional wastewater treatment for small communities (up to 2000 PE). This is mainly due to that operation and maintenance costs are reduced. Despite the advantages, the clogging of the bed is the most important trouble encountered by the managers of subsurface flow wetlands treatment systems. The solids accumulation in the interstitial spaces of the gravel over time causes the decrease of both, hydraulic conductivity and porosity. This leads in the development of preferential paths and short-circuiting of the water through the wetland,

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Tritschler, Sarah J. "Biogeochemical Processes and Seasonal Effects in Flow-Through Mesocosm Reactors Simulating Constructed Wetlands." Wright State University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=wright1198819178.

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Kjellin, Johan. "Coupled Hydrological and Microbiological Processes Controlling Denitrification in Constructed Wetlands." Licentiate thesis, Stockholm : [Mark- och vattenteknik, Kungliga Tekniska högskolan], 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4370.

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Ackah, Louis Akainya. "Comparative study of complete- mix and plug flow first-order kinetic models of constructed wetlands." OpenSIUC, 2013. https://opensiuc.lib.siu.edu/theses/1073.

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Constructed Wetlands are used in many parts of the world for the treatment of wastewater from diverse sources. They are effective, low cost and sustainable alternative to most conventional wastewater treatment processes. They are engineered to mimic many of the same processes that occur in natural wetlands but within a more controlled environment. The need for proper design of constructed wetlands for secondary and tertiary wastewater treatment is of utmost importance in meeting today's stringent water quality standards. Subsequently, numerous design tools have been proposed for the assessment

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Hanson, Carter Curtis. "Temporal effect on nitrogen removal in a subsurface flow constructed wetland." Virtual Press, 1996. http://liblink.bsu.edu/uhtbin/catkey/1027117.

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A subsurface flow constructed wetland planted with the common reed (Phragmites australis) and softstem bulrush (Scirpus validus) was built in East Central Indiana. The objective of this study was to determine if temperature had an effect on nitrogen (N) removal from the wetland. The research was conducted from the first week of October 3, 1995 to the first week in December 5, 1995 why the wetland froze. Water samples were taken from 5 samplings sites in the system. Each sample was analyzed for organic-N, ammonia, nitrate, and total-N. In the system statistically significant amounts of organic-

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Torrens, Armengol Antonina. "Subsurface flow constructed wetlands for the treatment of wastewater from different sources. Design and operation." Doctoral thesis, Universitat de Barcelona, 2016. http://hdl.handle.net/10803/380738.

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The aim of the thesis is to examine the viability of the subsurface constructed wetlands for the treatment of wastewater derived from three different sources (treatment ponds, pig farms and car wash facilities), and to evaluate the influence of design (size, type and depth of media, presence of Phragmites australis) and operational parameters (hydraulic load, dosing and feeding modes) on treatment efficiency and hydraulic behavior. Several studies were done in the framework of different national and European R+D projects in 4 study sites. The viability of constructed wetlands with vertical

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Olsson, Linda. "Effect of design and dosing regime on the treatment performance of vertical flow constructed wetlands." Thesis, Linköpings universitet, Ekologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-69689.

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Vertical flow constructed wetlands (VF CWs) are becoming increasingly popular for onsite wastewater treatment due to their high oxygen transfer capacity and high nitrification rates. However, there are still some question marks regarding (1) how the treatment performance of VF CWs is affected by design and operational parameters, and (2) the treatment processes happening inside the wetland bed as the wastewater percolates through. In this study, we investigated the effects of filter media (coarse sand or fine gravel), dosing regime (hourly with 4 mm or bi-hourly with 8 mm) and plant presence (

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Tebitendwa, Sylvie Muwanga. "Performance evaluation and cost analysis of subsurface flow constructed wetlands designed for ammonium-nitrogen removal." Thesis, Rhodes University, 2018. http://hdl.handle.net/10962/61808.

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Subsurface flow constructed wetlands (SSF CWs) is a low-cost, environmentally friendly sanitation technology for on-site treatment of domestic/municipal sewage. However, these systems are apparently unable to produce treated water of a quality suitable for discharge particularly in terms of nitrogen concentration, which has been attributed to design and operation based on biological oxygen demand as the parameter of choice. The aim of this study was to evaluate the performance, support medium, and techno-economics of a vertical- horizontal (V-H) SSF hybrid CW designed and operated using ammoni

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Arias, Lopez José Luis. "Vertical-flow constructed wetlands for the treatment of wastewater and stormwater from combined sewer systems." Phd thesis, INSA de Lyon, 2013. http://tel.archives-ouvertes.fr/tel-00961202.

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French vertical-flow constructed wetlands (VFCW) directly treating raw wastewater are known to perform well on for SS, COD and nitrification. They are also known to robustly cope with hydraulic overloads during rainfall events. Although numerous systems have been installed in areas equipped with a combined sewer, the limits of stormwater acceptance remain ill-defined and need to be improved. Looking at the various VFCW designs and usages reported in the literature, it is difficult to draw any consensus on their hydraulic limits. Consequently, designing VFCW to accept hydraulic overloads is a c

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Kiracofe, Brandon Dean. "Performance Evaluation of the Town of Monterery Wastewater Treatment Plant Utilizing Subsurface Flow Constructed Wetlands." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/34093.

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Field tests were conducted and historical operating data were evaluated to assess the performance of the Monterey WWTP utilizing subsurface flow (SF) constructed wetlands. Previous work with SF wetlands has demonstrated adequate, but variable removal of organic matter, suspended solids, and nitrogen. Few research studies have observed the generation of compounds in the wetlands that affect other treatment processes, specifically reduced compounds that contribute to the chlorine demand. This study attempts not only to distinguish the factors leading to the inadequate performance of the SF we

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Hussein, A. "Azo textile dyes wastewater treatment with constructed wetlands : design and operation of experimental vertical-flow constructed wetlands applied for the treatment of azo textile dyes (with/without artificial wastewater)." Thesis, University of Salford, 2017. http://usir.salford.ac.uk/43774/.

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Wetlands have long played a significant role as natural purification systems. Textile industry processes are among the most environmentally unsustainable industrial processes, because they produce coloured effluents in large quantities polluting water. The aim of this study is to assess the performance of VFCWs to treat two different azo textile dyes with and without artificial wastewater for long periods of time through different operation modes such as contact and resting times, and loading rates, which has rarely been considered in previous research works. The corresponding key objectives a

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Womack, Michael. "Temporal effects on orhophosphate removal from municipal wastewater in a subsurface-flow constructed wetland." Virtual Press, 1996. http://liblink.bsu.edu/uhtbin/catkey/1020163.

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Orthophosphate removal from wastewater in a subsurface-flow constructed wetland (SFCW) was studied during the fall of 1995. The SFCW consisted of a cell with an impervious liner, filled with 1.27 to 3.81 cm river rock and planted with common reeds (Phragmites australis) and soft-stem bulrushes (Scirpus validus). Municipal wastewater was pumped through the wetland and comparisons were made between inlet and outlet orthophosphate concentrations. Comparisons were also made at locations within the cell. A mean orthophosphate reduction of 62% with a range of 91% to 32% was observed for the duration

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Caselles, Osorio Aracelly. "Influence of the characteristics of organic matter on the efficiency of horizontal subsurface-flow constructed wetlands." Doctoral thesis, Universitat Politècnica de Catalunya, 2007. http://hdl.handle.net/10803/7054.

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Los sistemas de humedales construidos de flujo subsuperficial horizontal (HCFSS) constituyen una tecnología válida para la depuración de aguas residuales urbanas. Uno de los principales objetivos de estos sistemas es eliminar la materia orgánica, los sólidos y los nutrientes presentes en el agua residual decantada. La materia orgánica mineral contenida en el agua residual se compone de una mezcla compleja de sustancias de diferentes tamaño y composición química. En sistemas de tratamiento convencionales se ha demostrado que la istribución de tamaños de partículas del agua residual afluente

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Doheny, Ryan Matthew. "Evaluation of Constructed Wetlands and Pretreatment Options For the Treatment of Flow-through Trout Farm Effluent." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/76824.

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Horizontal subsurface flow (HSSF) constructed wetlands were evaluated for the treatment of flow-through trout farm effluent, phosphorus sorption affinity of gravel-bed media, and influence on Rhodamine WT (RWT) transport. HSSF wetlands coupled with mechanical pretreatment demonstrated significant (p <0.05) removal of total ammonia-nitrogen (TAN), total phosphorus (TP), total organic carbon (TOC), total suspended solids (TSS), five-day biochemical oxygen demand (BOD5), and turbidity. Treatment occurred predominantly within the wetland cells, with minimal removal of studied water quality paramet

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Ge, Chang. "The Seasonal Dynamics of Removal of Nitrogen in Free Water Surface Constructed Wetlands in cold climate." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-40816.

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In Sweden and other Nordic countries, Free Water Surface (FWS) constructed wetlands are widely used for advanced sewage treatment. This study was performed in an experimental wetlands system in order to research the seasonal dynamics and interferences in N removal under cold climate condition. According to the result of study, as expected, N removal in FWS wetlands is strong related to temperature, the removal rates are higher in late summer and autumn than in spring and early summer. Removal at similar temperatures are quite different when they are in different months. For instance, in the st

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Goulet, Richard Roger. "Mechanisms affecting metal retention by surface-flow wetlands in cold temperate climates." Thesis, University of Ottawa (Canada), 2001. http://hdl.handle.net/10393/9210.

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The mechanisms affecting metal retention by surface-flow wetlands were investigated by relating variations in metal retention to variables such as hydraulic residence time, temperature (i.e. seasonal effects), phytoplankton biomass, photosynthesis and the presence of emergent vegetation. The importance of hydraulic residence time was investigated at the Monahan surface-flow wetland in Kanata, Ontario. This wetland retained metals best during summer and fall whereas during winter, the metal retention was significantly lower. The first-order removal model predicted Fe and Mn retention in the spr

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Ruiz, Rueda Olaya. "Nitrifying and denitrifying bacterial communities in the sediment and rhizosphere of a free water surface constructed wetland." Doctoral thesis, Universitat de Girona, 2008. http://hdl.handle.net/10803/7871.

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La contínua descàrrega de nutrients, sobretot fosfats i nitrogen, és la major causa d'eutrofització dels ecosistemes aquàtics. Els sistemes de tractament basats en aiguamolls construïts s'han emprat per reduir ells nivells de nitrogen a l'aigua com a alternativa de baix cost als mètodes de depuració convencionals. L'eliminació del nitrogen a aquests sistemes depèn en bona part de la vegetació, i l'alternança de condicions aeròbiques i anaeròbiques per promoure els processos de nitrificació i desnitrificació. En aquest treball hem volgut investigar les activitats microbianes de nitrificació i

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Korkusuz, Asuman Elif. "Domestic Wastewater Treatment In Pilot-scale Constructed Wetlands Implemented In The Middle East Technical University." Phd thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605387/index.pdf.

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To foster the practical development of constructed wetlands used for wastewater treatment in Turkey, a pilot-scale subsurface constructed wetland system (90 m2) was designed to treat the domestic wastewater produced by 60 PE living in the residential area of METU. In summer 2001, two parallel sets of hybrid wetland systems (vertical flow connected with horizontal flow) with identical design configuration, but with different fill media (blast furnace granulated iron slag and gravel) were built on the old sludge-drying bed of the abandoned wastewater treatment plant of METU, which has not been o

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Postila, H. (Heini). "Peat extraction runoff water purification in treatment wetlands constructed on drained peatlands in a cold climate." Doctoral thesis, Oulun yliopisto, 2016. http://urn.fi/urn:isbn:9789526212258.

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Abstract Best available technology (BAT) should be used for peat extraction runoff purification. One currently used BAT technique is treatment wetland construction on pristine peatland, but under Finnish national strategies, new peat extraction areas should only be established on previously drained peatland and it can be challenging to find natural, intact peatland for treatment wetlands near these areas. This thesis evaluated the function and purification efficiency of treatment wetlands constructed on drained peatland and examined factors that could indicate their purification efficiency. Th

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Browning, Catharine, and n/a. "Nutrient Removal and Plant Growth in a Subsurface Flow Constucted Wetland in Brisbane, Australia." Griffith University. School of Environmental Engineering, 2003. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20040226.092311.

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One of the major water quality issues affecting waterways is eutrophication. Controlling the input of nutrients from municipal wastewater treatment plants (WTPs) is a significant step in reducing eutrophication. Tertiary wastewater treatment for water quality improvement in particular Biological Nutrient Removal (BNR) is often expensive to construct with high maintenance costs. Constructed wetlands (CWs) offer an alternative wastewater treatment and have been used successfully worldwide to treat various types of wastewater. This study investigated the effectiveness of the Oxley Creek horizont

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Browning, Catharine. "Nutrient Removal and Plant Growth in a Subsurface Flow Constucted Wetland in Brisbane, Australia." Thesis, Griffith University, 2003. http://hdl.handle.net/10072/366348.

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One of the major water quality issues affecting waterways is eutrophication. Controlling the input of nutrients from municipal wastewater treatment plants (WTP’s) is a significant step in reducing eutrophication. Tertiary wastewater treatment for water quality improvement in particular Biological Nutrient Removal (BNR) is often expensive to construct with high maintenance costs. Constructed wetlands (CWs) offer an alternative wastewater treatment and have been used successfully worldwide to treat various types of wastewater. This study investigated the effectiveness of the Oxley Creek horizont

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Teiter, Sille. "Emission rates of N₂O N₂, CH₄ and CO₂ in riparian grey alder forest and subsurface flow constructed wetlands /." Online version, 2005. http://dspace.utlib.ee/dspace/bitstream/10062/746/5/teiter.pdf.

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Forbes, Margaret G. "Phosphorus Retention and Fractionation in Masonry Sand and Light Weight Expanded Shale Used as Substrate in a Subsurface Flow Wetland." Thesis, University of North Texas, 2002. https://digital.library.unt.edu/ark:/67531/metadc3183/.

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Constructed wetlands are considered an inefficient technology for long-term phosphorus (P) removal. The P retention effectiveness of subsurface wetlands can be improved by using appropriate substrates. The objectives of this study were to: (i) use sorption isotherms to estimate the P sorption capacity of the two materials, masonry sand and light weight expanded shale; (ii) describe dissolved P removal in small (2.7 m3) subsurface flow wetlands; (iii) quantify the forms of P retained by the substrates in the pilot cells; and (iv) use resulting data to assess the technical and economic feasibil

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Wahl, Mark D. "Key Influences on Hydraulic Efficiency in Treatment Wetlands." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1385421888.

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Nalesso, Mauro. "Integrated Surface-Ground Water Modeling in Wetlands With Improved Methods to Simulate Vegetative Resistance to Flow." FIU Digital Commons, 2009. http://digitalcommons.fiu.edu/etd/122.

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This dissertation focused on developing an integrated surface – subsurface hydrologic simulation numerical model by programming and testing the coupling of the USGS MODFLOW-2005 Groundwater Flow Process (GWF) package (USGS, 2005) with the 2D surface water routing model: FLO-2D (O’Brien et al., 1993). The coupling included the necessary procedures to numerically integrate and verify both models as a single computational software system that will heretofore be referred to as WHIMFLO-2D (Wetlands Hydrology Integrated Model). An improved physical formulation of flow resistance through vegetation i

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Nuel, Maximilien. "Devenir des résidus médicamenteux et de leur métabolites au sein des Zones de Rejet Végétalisées (ZRV)." Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAD022/document.

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Les Stations de Traitement des Eaux Usées (STEU) sont l'une des principales sources de rejet de résidus médicamenteux dans l'environnement. Depuis 2009, les Zones de Rejet Végétalisées (ZRV) sont mises en oeuvre entre le rejet de la STEU et le milieu récepteur, mais leurs capacités d'abattement sont encore peu étudiées. Pour combler ce manque, les performances d'épuration de 2 STEU et de leur ZRV, ont été évaluées pendant 2 années. Les résidus médicamenteux (86) ont eu une majorité de rendements d'épuration compris entre 30 et 70 % dans les ZRV et avec des maximums en été et des minimums en hi

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Jage, Christopher Raymond. "Water Quality Based Design Guidelines for Successive Alkalinity-Producing Systems Used in the Treatment of Acidic Mine Drainage." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/31390.

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Successive Alkalinity-Producing Systems (SAPS) have proven to be a viable alternative to chemical treatment for renovating acidic mine drainage (AMD). The lack of water quality based design guidelines, however, is believed to be a cause of the variability of SAPS performance in the field. This study monitored eight SAPS systems for the purpose of determining the effect of influent water quality and system design on system performance. Monthly water quality data were obtained for each system over periods ranging from 3 to 5 years. All systems demonstrated an ability to generate alkalinity an

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