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  • 1.
    Bodin, Hristina
    et al.
    Division of Natural Sciences, Kristianstad University, Kristianstad, Sweden.
    Ehde, Per Magnus
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Weisner, Stefan
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Attenuation of Pharmaceutical Substances: Phytoremediation using Constructed Wetlands2018In: 13th Society of Wetland Scientists (SWS) Europe Chapter Meeting: Management of Wetland Ecosystem Services: Issues, Challenges and Solutions, 2018, p. 19-22Conference paper (Refereed)
    Abstract [en]

    Introduction: Currently, wastewater treatment plants (WWTPs) do not efficiently remove pharmaceutical substances (PS). Thus, such substances are now frequently found in aquatic ecosystems worldwide. Also, concentrations of some PS in treated effluents exceed Environmental Quality Standards proposed by EU legislation. One resource-efficient option for increasing PS removal in WWTP effluents is to use constructed wetlands (CWs) as an attenuation step (Breitholtz et al. 2012; Li et al. 2014). However, very little research has been done on how to maximize the PS attenuation capacity of CWs. Therefore, a project with the aim to investigate reduction of different pharmaceutical substances in CWs with different vegetation compositions and water depths, was performed at the Experimental Wetland Area (EVA) located 20 km north of Halmstad, Sweden. 

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  • 2.
    Ingheden, Felix
    et al.
    Halmstad University, School of Business, Engineering and Science.
    Gabrielsson, Jonathan
    Halmstad University, School of Business, Engineering and Science.
    LV Filter: Ett partikelfilter för hushåll i mindre gynnsamma levnadsförhållanden2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    LV Filter is a product designed to provide drinkable tap water to households around the world. With a power source, the system manages itself with automatic cleaning. A safe and easy source of particle-free water. The product is intended as a complement to the client's product portfolio in order to offer a complete solution for water purification.

    LV Filter is developed in such a way that it can be manufactured in the country in which it is to be sold. This helps the product not only provide drinking water for households but also contributes to economic growth and job creation. In this way, one can contribute to a long-term change for both users and those who manufacture the product. Manufacturing is adapted in such a way that expensive and complicated methods will not be required to facilitate manufacturing in less developed places.

    The need that the product satisfies is imminent to a large number of people. The poor countries in the world are growing rapidly, so LV Filter can eventually increase the living standards of these people because they demand the absolute cheapest solutions and can not afford systems from the western world.

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  • 3.
    Lind, Linus
    Halmstad University, School of Business and Engineering (SET).
    Typhas inverkan på reningsgraden av TKN, BOD5 och COD i en anlagd rotzonsvåtmark i pilotskala.2010Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The ability for a subsurface flow constructed wetland system to treat landfill leachate was evaluated in Lajeado, Rio Grande do Sul, Brazil. Eight 0.95 m x 0.6 m experimental (SSF) units with a depth 0.4 m were used. Each wetland had unique conditions. Four units were planted with Typha angustifolia L. and four units were unplanted. Two different substrate dimension were used, four units with sand and four with gravel. Four wetlands operated in batch mode and four units with continuous flow. Batch flow systems were drained and filled up each week. To review vegetations impact on BOD5, COD and nitrogen compounds reduced in a wetland. This project lasted between January until May 2010 and samples were analyzed in April to May in four weeks.The result from this project show higher evapotranspiration water loss in units with planted vegetation and higher effluents concentration of BOD5, COD and nitrogen compounds, than in unplanted units.The ability for a subsurface flow constructed wetland system to treat landfill leachate was evaluated in Lajeado, Rio Grande do Sul, Brazil. Eight 0.95 m x 0.6 m experimental (SSF) units with a depth 0.4 m were used. Each wetland had unique conditions. Four units were planted with Typha angustifolia L. and four units were unplanted. Two different substrate dimension were used, four units with sand and four with gravel. Four wetlands operated in batch mode and four units with continuous flow. Batch flow systems were drained and filled up each week. To review vegetations impact on BOD5, COD and nitrogen compounds reduced in a wetland. This project lasted between January until May 2010 and samples were analyzed in April to May in four weeks.The result from this project show higher evapotranspiration water loss in units with planted vegetation and higher effluents concentration of BOD5, COD and nitrogen compounds, than in unplanted units.

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  • 4.
    Song, Xiaojun
    et al.
    Halmstad University, School of Business, Engineering and Science. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou, China.
    Ehde, Per Magnus
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Weisner, Stefan
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Effects of Water Depth and Phosphorus Availability on Nitrogen Removal in Agricultural Wetlands2019In: Water, ISSN 2073-4441, E-ISSN 2073-4441, Vol. 11, no 12, article id 2626Article in journal (Refereed)
    Abstract [en]

    Excess nitrogen (N) from agricultural runoff is a cause of pollution inaquatic ecosystems. Created free water surface (FWS) wetlands can be used as buffering systems to lower the impacts of nutrients from agricultural runoff. The purpose of this paper was to evaluate critical factors for N removal in FWSwetlands receiving high nitrate (NO3) loads from agriculture. The study was performed in 12 experimental FWS wetlands in southern Sweden, receiving drainage water from an agricultural field area. The effects of water depth (mean depth of 0.4 m and 0.6 m, respectively) and phosphorus (P) availability (with or without additional P load) were investigated from July to October. The experiment was performed in a two-way design, with three wetlands of each combination of depth and P availability. The effects of P availability on the removal of NO3 and total N were strongly significant, with higher absolute N removal rates per wetland area (g m−2 day−1) as well as temperature-adjusted first-order area-based removal rate coefficients (Kat) in wetlands with external P addition compared to wetlands with no addition. Further, higher N removal in deep compared to shallow wetlands was indicated by statistically significant differences in Kat. The results show that low P availability may limit N removal in wetlands receiving agricultural drainage water. Furthermore, the results support that not only wetland area but also wetland volume may be important for N removal. The results have implications for the planning, location, and design of created wetlands in agricultural areas. © 2019 by the authors

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  • 5.
    Waara, Sylvia
    et al.
    School for Sustainable Development of Society and Technology, Mälardalen University, Västerås, Sweden.
    Waara, Karl-Otto
    School for Sustainable Development of Society and Technology, Mälardalen University, Västerås, Sweden.
    Forsberg, Åke
    School for Sustainable Development of Society and Technology, Mälardalen University, Västerås, Sweden.
    Fridolfsson, Magnus
    Tekniska förvaltningen, Örebro Kommun, Atleverket, Örebro, Sweden.
    Performance of a Constructed Wetland System for Treatment of Landfill Leachate2008In: Proceedings Waste 2008: Waste and Resource Management – a Shared Responsibility / [ed] Marie Townshend, Stanton-on-the-Wolds: Waste Conference Ltd. , 2008, p. 655-667Conference paper (Refereed)
    Abstract [en]

    The performance of a constructed wetland for treatment of landfill leachate has been evaluated based upon data obtained during 4 years (2003-2006). It consists of a series of 10 ponds with a total capacity of 52.000 m3 covering 8 ha. Using univariate and multivariate statistics (PCA) the reduction pattern of a large number of chemical parameters including heavy metals has been investigated in 3 parts of the wetland with equal volume. Analyses show that many parameters are removed to the greatest extent in the first part of the system (e.g. many heavy metals, total suspended solids) or the second part of the system (N-NH4) while other parameters such as total nitrogen are more gradually reduced (10 ton/year removed).  Toxicity testing with 5 bioassays showed that toxicity was sometimes observed at the inlet but no toxicity was observed at the outlet for 4 of the test species. The data presented will be used for optimizing the treatment process as well as to improve the monitoring program.

  • 6.
    Waara, Sylvia
    et al.
    Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS), Environmental Science, Wetland Research Centre.
    Wojciechowska, Eva
    Faculty of Civil & Environmental Engineering, Gdansk University of Technology, Gdansk, Polen.
    Distribution and removal efficiency of heavy metals in two constructed wetlands treating landfill leachate2011In: Water Science and Technology, ISSN 0273-1223, E-ISSN 1996-9732, Vol. 64, no 8, p. 1597-1606Article in journal (Refereed)
    Abstract [en]

    The results of heavy metals (Fe, Mn, Zn, Ni, Cu, Cr, Pb, Cd) removal and partitioning between aqueous and solid phases at two treatment wetlands (TWs) treating municipal landfill leachates are presented. One of the TWs is a surface flow facility consisting of 10 ponds. The other TW is a newly constructed pilot-scale facility consisting of three beds with alternately vertical and horizontal sub-surface flow. The metals concentrations were analysed in leachate (both TWs) and bottom sediments (surface flow TW). Very high (90.9-99.9%) removal rates of metals were observed in a mature surface flow TW. The effectiveness of metals removal in a newly constructed pilot-scale sub-surface flow wetland were considerably lower (range 0-73%). This is attributed to young age of the TW, different hydraulic conditions (sub-surface flow system with much shorter retention time, unoxic conditions) and presence of metallic complexes with refractory organic matter

  • 7.
    Waara, Sylvia
    et al.
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Wojciechowska, Ewa
    Faculty of Civil & Environmental Engineering, Gdansk University of Technology, Gdansk, Poland.
    Treatment of landfill leachate in a constructed free water surface wetland system over a decade – Identification of disturbance in process behaviour and removal of eutrophying substances and organic material2019In: Journal of Environmental Management, ISSN 0301-4797, E-ISSN 1095-8630, Vol. 249, article id 109319Article in journal (Refereed)
    Abstract [en]

    An 8 ha free water surface wetland system in Orebro, Sweden, which has sediment traps followed by 10 ponds for treatment of landfill leachate in the methanogenic stage, was studied from 2003 to 2012. The wetland was irregularly loaded and the leachate characteristics showed high temporal and spatial variability, so Multivariate Statistical Process Control was chosen as the diagnostic tool for detecting anomalies prior to assessing removal efficiency for eutrophying substances and organics. Disturbances in process behaviour included those due to intermittent flow, dilution due to snowmelt, an episode of high pollutant load, and sampling technique. The wetland total nitrogen mass removal was 89%, resulting in a first order rate coefficient of 1.7 m/year. Total phosphorus mass removal was 98%, while mass reduction was lower for TOC (60%), although this was still below discharge limits. The low amount of labile organic material and phosphate are probably the main reasons for the low denitrification rate. © 2019 Elsevier Ltd. All rights reserved.

  • 8.
    Weisner, Stefan
    et al.
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Johannesson, Karin
    IFM Biology, Linköping University, Linköping, Sweden.
    Thiere, Geraldine
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Svengren, Henrik
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Ehde, Per Magnus
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Tonderski, Karin S.
    IFM Biology, Linköping University, Linköping, Sweden.
    National Large-Scale Wetland Creation in Agricultural Areas—Potential versus Realized Effects on Nutrient Transports2016In: Water, ISSN 2073-4441, E-ISSN 2073-4441, Vol. 8, no 11, article id 544Article in journal (Refereed)
    Abstract [en]

    During 2007–2013, the Swedish Board of Agriculture granted support within a national program to about 1000 wetlands, corresponding to a 5300-hectare wetland area, with the dual goal to remove nutrients from water and to improve biodiversity in agricultural landscapes. The aim of the present study was to compare the effects on nutrient transports that are realized within the national program to what could be obtained with the same area of wetlands if location and design of wetlands were optimized. In single, highly nutrient-loaded wetlands, a removal of around 1000 kg nitrogen and 100 kg phosphorus per hectare wetland area and year was estimated from monitoring data. Statistical models were developed to estimate the overall nutrient removal effects of wetlands created within the national program. Depending on model, the effect of the national program as a whole was estimated to between 27 and 38 kg nitrogen and between 2.7 and 4.5 kg phosphorus per hectare created wetland area and year. Comparison of what is achieved in individual wetlands to what was achieved in the national program indicates that nutrient removal effects could be increased substantially in future wetland programs by emphasising location and design of wetlands.

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1 - 8 of 8
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