hh.sePublications
Change search
Refine search result
1 - 18 of 18
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1.
    Andersson, Ramon
    Halmstad University.
    Hållbart jordbruk inom vattenskyddsområde: En studie om Sverige, Danmark, Frankrike och Tyskland2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    To guarantee protection of our drinking water, water catchment protections are established. These are divided into three different zones and in the first zone it is most likely that an activity, such as agriculture, will contaminate the water resource. Hence the activities are strongly regulated or banned. The EU communion is working towards a sustained water quality through several directives; Nitrate Directive, Waterframwork directives and Sustainable use of pesticide directive. The main purpose is to regulate the diffuse pollution from agriculture.This thesis is about how Denmark, Germany and France are working towards a sustainable agriculture within water protection areas. Sweden is also discussed but mainly about two different methods applied in Linköpings and Ljungbys municipalties.How the different countries work is mainly the same due to the directives. However, there are some interesting water management methods to observe such as voluntary agreements between water companies and farmers. Moreover, the sustainability perspective is approached in a larger scale where you and I as consumers also contribute via consumer-pays-principle. Therefore, we are, by our demand for water, the problem but also the solution and together we can contribute with good social, economic and ecological conditions for ourselves and the farmer.

    Download full text (pdf)
    fulltext
  • 2.
    Huerta Buitrago, Belinda
    et al.
    School of Sustainable Development of Society and Technology, Mälardalen University, Västerås, Sweden.
    Ferrer Munoz, Patricia
    School of Sustainable Development of Society and Technology, Mälardalen University, Västerås, Sweden.
    Ribé, Veronica
    School of Sustainable Development of Society and Technology, Mälardalen University, Västerås, Sweden.
    Larsson, Maria
    Man-Technology-Environment Research Center, School of Science and Technology, Örebro University, Örebro, Sweden.
    Engwall, Magnus
    Man-Technology-Environment Research Center, School of Science and Technology, Örebro University, Örebro, Sweden.
    Wojciechowska, Eva
    Gdańsk University of Technology, Faculty of Civil and Environmental Engineering, Gdańsk, Poland .
    Waara, Sylvia
    Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS). School of Sustainable Development of Society and Technology, Mälardalen University, Västerås, Sweden.
    Hazard assessment of sediments from a wetland system for treatment of landfill leachate using bioassays2013In: Ecotoxicology and Environmental Safety, ISSN 0147-6513, E-ISSN 1090-2414, Vol. 97, p. 255-262Article in journal (Refereed)
    Abstract [en]

    Four bioassays were used in this study for the hazard assessment of sediments from sediment traps and several ponds in a treatment wetland for landfill leachate at Atleverket, Sweden. In the 6-day solid phase microbiotest with the sediment-dwelling crustacean Heterocypris incongruens both acute and chronic effects were observed with a gradual decrease and loss of toxicity with treatment in the wetland system. Some samples showed a low toxicity in porewater and only one sample was weakly toxic in the whole sediment test when assessed with Aliivibrio fischeri (Vibro fischeri). No genotoxicity was detected in the umu test. The toxicity response in the H4IIE- luc test evaluating the presence of dioxin-like compounds was considerably higher in the samples from the sediment traps. The hazard of the sediment therefore appears to be highest in the sediment traps and pond 1 with the methods employed. The result indicates that the wetland system has a design supporting the concentration and sequestration of toxic substances in the first part of the wetland. Based upon the results we suggest that hazard assessment of sediments from other treatment wetlands for landfill leachate should be conducted. (c) 2013 Elsevier Inc. All rights reserved.

  • 3.
    Jaggwe, Assad
    Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS).
    Effects of Environmental Variables on Four Aquatic Insect Taxa among Smaller Water Bodies of Different Ages on Farmland; A Pilot Study2015Independent thesis Advanced level (degree of Master (Two Years)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    High anthropogenic modification like infrastructural development, drainage, eutrophication, dumping garbage, is a threat to biodiversity of smaller water bodies in agricultural landscapes. However, smaller water bodies have historically been constructed for drainage, waste treatment and other purposes. Further, new small water bodies are now being constructed in agricultural areas in Sweden, mainly to remove nutrients and to improve landscape biodiversity. This creates two different age classes (old and new) of smaller water body habitats. I sampled aquatic insects in 27 smaller water bodies of varying types and ages in Halmstad region and related insect biodiversity, species richness, composition structure to environmental variables. I partitioned the region into two locations (Northern and Southern) for easy data comparison and due to difference in topography. The data was analysed using a Canonical Correspondence (CCA) and regression analysis. The CCA results show a difference in the species composition between old and new sites. The most important variables in explaining species assemblage structure was age of the aquatic water bodies. The species richness decreased with increase in nutrient concentration (total phosphorus) according to regression analysis. Species composition and diversity were related to Vegetation and tree cover in and around the water body. The results of my study shows that the older the water bodies the better for specific species like Aeshna cyanea and the new water bodies tolerate more specimens. My results suggest that, as there is need to facilitate plant growing, protecting vegetation and trees to better mimic natural conditions of water bodies, creating new water bodies while protecting aged water bodies is important for conservation of biodiversity.

    Download full text (pdf)
    Jaggwe
  • 4.
    Johansson, Marika
    et al.
    Halmstad University, School of Business, Innovation and Sustainability.
    Zeilon, Kajsa
    Halmstad University, School of Business, Innovation and Sustainability.
    Den blomstertid nu kommer?: En studie av frilandsodlade svenska snittblommor - utmaningar och möjligheter utifrån ett hållbarhets- och livscykelperspektiv2022Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Cut flowers are products that have become a symbol of joy, sorrow and wealth. However, consumption contributes to various environmental problems, such as greenhouse gas emissions and leakage of nutrients and pesticides. This study aims to investigate the environmental impact of outdoor-grown cut flowers from a sustainability perspective in Sweden. The questions answered are which aspects of the cut flower lifecycle have the greatest environmental impact, what the cut flower growers think of the cut flower industry and its sustainability and how their work can become more sustainable. The study was conducted through semi-structured interviews with eight businesses that grow field-grown cut flowers and a literature review focusing on the environmental impact of cut flowers from a life cycle perspective. The results from the literature review show that the main environmental and climate aspects from a life cycle perspective are transport, heating through fossil fuels and the use of fertilizers and chemical pesticides. The results from the interviews show that challenges with the cut flower industry are origins of seeds, lack of knowledge and behavior and consumption patterns. Opportunities consist of growing demand, good quality and being able to offer a more sustainable product. Swedish field-grown cut flowers can be considered a sustainable alternative to imported ones due to shorter transport and the difference in the use of nutrients and chemicals. Although, more transparency, knowledge and collaboration will be needed in the industry for long-term sustainable development. Measures that can be implemented to promote the production and consumption of Swedish sustainable cut flowers are political incentives and possibly a certification or labeling. 

    Download full text (pdf)
    fulltext
  • 5.
    Juvany, Laura
    et al.
    Swedish University of Agricultural Sciences, Lomma, Sweden.
    Hedwall, Per Ola
    Swedish University of Agricultural Sciences, Lomma, Sweden.
    Felton, Adam
    Swedish University of Agricultural Sciences, Lomma, Sweden.
    Öhman, Karin
    Swedish University of Agricultural Sciences, Umeå, Sweden.
    Wallgren, Märtha
    Swedish University of Agricultural Sciences, Umeå, Sweden; Forestry Research Institute of Sweden, Uppsala Science Park, Uppsala, Sweden.
    Kalén, Christer
    Swedish Environmental Protection Agency, Stockholm, Sweden; National Forest Agency, Borås, Sweden.
    Jarnemo, Anders
    Halmstad University, School of Business, Innovation and Sustainability.
    Johansen, Henrik
    Swedish University of Agricultural Sciences, Lomma, Sweden.
    Felton, Annika
    Swedish University of Agricultural Sciences, Lomma, Sweden.
    From simple metrics to cervid forage: Improving predictions of ericaceous shrub biomass2023In: Forest Ecology and Management, ISSN 0378-1127, E-ISSN 1872-7042, Vol. 544, article id 121120Article in journal (Refereed)
    Abstract [en]

    Common understory vegetation species such as the ericaceous shrubs bilberry (Vaccinium myrtillus), cowberry (V. vitis-idaea) and heather (Calluna vulgaris), are key forage plant species for moose and other large herbivores, as well as fulfilling many additional ecosystem functions and services. Here we developed models to predict above-ground biomass of these ericaceous species in coniferous forests, using data on their percentage cover, height, and different stand characteristics. We also built models to understand how the aforementioned variables affect the proportion of the shrubs commonly utilized as forage by large herbivores. We found that the percentage cover of shrubs was the most important explanatory variable when predicting above-ground biomass, explaining 51%, 47% and 71% of the variation (marginal R2) in bilberry, cowberry and heather biomass, respectively. By adding ramet height to the model with percentage cover, the variation explained increased to 77% for bilberry, 75% for cowberry and 87% for heather. The best outcome for candidate models was obtained by adding stand site index and spruce basal area to the model, improving the variation explained in bilberry to 83%, to 81% for cowberry, and 91% for heather. When modelling the proportion of the shrubs commonly utilized as forage by large herbivores, stand site index and spruce basal area often played important roles. Some of the best fitting models for forage biomass explained 51% of the variation in bilberry, 59% in cowberry and 30% in heather. Site location did not have a major role in improving the variability explained in either type of model, which indicated the applicability of the models regardless of study location. Our models therefore have a high potential to be implemented in forestry decision support systems. Their inclusion should provide better large-scale estimations of forage resources, aiding forest management, and thereby taking an important step forward to determine the ecosystem carrying capacity of large herbivores. © 2023 The Author(s)

  • 6.
    Kasiuliene, Alfreda
    et al.
    Institute of Environment and Ecology, Vytautas Magnus University, Kaunas, Lithuania.
    Paulauskas, Valdas
    t and Ecology, Vytautas Magnus University, Kaunas, Lithuania.
    Marozas, Vitas
    t and Ecology, Vytautas Magnus University, Kaunas, Lithuania.
    Waara, Sylvia
    Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).
    Accumulation of heavy metals in forest dwarf shrubs and dominant mosses as bioindicators of atmospheric pollution2019In: Journal of Elementology, ISSN 1644-2296, Vol. 24, no 3, p. 1079-1090Article in journal (Refereed)
    Abstract [en]

    This article discusses the environmental concerns about heavy metal accumulation in dominant forest mosses and dwarf shrubs. Samples of two different species of mosses, such as glittering wood moss (Hylocomium splendens) and feathermoss (Pleurozium schreberi), and two species of dwarf shrubs, that is European blueberry (Vaccinium myrtillus) and lingonberry (Vaccinium vitis-idaea), were collected from specifically chosen areas with evident anthropogenic pollution (vicinity of an airport and close to heavy road traffic) and from contamination-free, secluded forest areas in Lithuania and Sweden. Instrumental analysis of heavy metals, including cadmium, chromium, copper, lead and zinc, revealed that the selected plant species tend to accumulate zinc and copper the most and chromium the least. Forest mosses, used as indicators of airborne pollution, accumulated less heavy metals than dwarf shrubs, indicating more metal accumulation from the soil. The results also revealed that forest, dwarf shrub leaves even picked from areas with known anthropogenic pollution sources were safe to use. since concentrations of cadmium and lead remained below the maximum permissible level. A multivariate data analysis model with two principle components explained more than 70% of the data variation. The heavy metal content in soil was the most distinctive factor separating the Lithuanian and Swedish sites. Cadmium and chromium soil contents were more significant in the Lithuanian soils, whereas copper, lead, and zinc were more significant in the Swedish soils.

  • 7.
    Klatt, Björn K.
    et al.
    Halmstad University, School of Business, Innovation and Sustainability. Lund University, Lund, Sweden.
    Wurz, Annemarie
    Lund University, Lund, Sweden; University of Göttingen, Göttingen, Germany; Universität Marburg, Marburg, Germany.
    Herbertsson, Lina
    Lund University, Lund, Sweden.
    Rundlöf, Maj
    Lund University, Lund, Sweden.
    Svensson, Glenn P.
    Lund University, Lund, Sweden.
    Kuhn, Jürgen
    Lund University, Lund, Sweden.
    Vessling, Sofie
    Lund University, Lund, Sweden.
    de La Vega, Bernardo
    Lund University, Lund, Sweden; Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.
    Tscharntke, Teja
    University of Göttingen, Göttingen, Germany.
    Clough, Yann
    Lund University, Lund, Sweden.
    Smith, Henrik G.
    Lund University, Lund, Sweden.
    Seed treatment with clothianidin induces changes in plant metabolism and alters pollinator foraging preferences2023In: Ecotoxicology, ISSN 0963-9292, E-ISSN 1573-3017, Vol. 32, no 10, p. 1247-1256Article in journal (Refereed)
    Abstract [en]

    Neonicotinoids, systemic insecticides that are distributed into all plant tissues and protect against pests, have become a common part of crop production, but can unintentionally also affect non-target organisms, including pollinators. Such effects can be direct effects from insecticide exposure, but neonicotinoids can affect plant physiology, and effects could therefore also be indirectly mediated by changes in plant phenology, attractiveness and nutritional value. Under controlled greenhouse conditions, we tested if seed treatment with the neonicotinoid clothianidin affected oilseed rape’s production of flower resources for bees and the content of the secondary plant products glucosinolates that provide defense against herbivores. Additionally, we tested if seed treatment affected the attractiveness of oilseed rape to flower visiting bumblebees, using outdoor mesocosms. Flowers and leaves of clothianidin-treated plants had different profiles of glucosinolates compared with untreated plants. Bumblebees in mesocosms foraged slightly more on untreated plants. Neither flower timing, flower size nor the production of pollen and nectar differed between treatments, and therefore cannot explain any preference for untreated oilseed rape. We instead propose that this small but significant preference for untreated plants was related to the altered glucosinolate profile caused by clothianidin. Thereby, this study contributes to the understanding of the complex relationships between neonicotinoid-treated crops and pollinator foraging choices, by suggesting a potential mechanistic link by which insecticide treatment can affect insect behavior.

    Download full text (pdf)
    fulltext
  • 8.
    Kojic, Selma
    Halmstad University, School of Business, Engineering and Science.
    Påverkan av djup och fosfors tillgänglighet på konstruerade våtmarkers förmåga att avskilja kväve2020Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Eutrophication is an expanding issue due to the increase of human-induced nitrogen leakage from agriculture. Eutrophication can lead to severe environmental problems such as exaggerated algal bloom and oxygen deprivation in water courses. One approach to clear away nitrogen is to use constructed wetlands. Wetlands have the ability to clean the water that flows through it by biological, chemical and physical reactions. The aim of this study is to determine if a deep or shallow wetland is more advantageous in removing nitrogen and how phosphor addition affects nitrogen removal. The method used was analysis of concentrations of nitrate, nitrite (NO3- + NO2-) and phosphorous from the years 2018 and 2019 from an experimental wetland in Halmstad, Sweden, and carrying out a quantitative experimental study. The results showed that NO3- + NO2- removal was higher in deeper wetlands for both years and for the removal rate coefficients in 2019. Ponds with phosphorus addition had an increase in NO3- + NO2- removal. The research conclusion was that the deeper wetlands are more efficient at removing nitrogen than shallow. Phosphorous addition increases the nitrogen removal in both shallow and deep ponds. Shallow wetlands might have potential to become superior compared to deep wetlands when the vegetation and bacteria establish. This statement however requires further research.

    Download full text (pdf)
    fulltext
  • 9.
    Landgren, Emilia
    et al.
    Halmstad University, School of Business and Engineering (SET).
    Wallman, Sabina
    Halmstad University, School of Business and Engineering (SET).
    Hästavmaskningsmedels påverkan på miljö och välfärd2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Healthy, natural pastures is very valuable for biodiversity in the form of both plants and animals. An efficient use of pastures helps to preserve biodiversity, but grazing animals needs to be de-wormed to keep them healthy and to prevent harmful parasites spread on the pasture. The awareness about the environmental impact of the frequent use of deworming agents is low among the public. Some people are unaware that the absorption in horses of anthelmintics is incomplete, which make the circumstances about enviromental effect important to investigate further. The scientific evidence in this area is limited and more studies and trials are needed to deepen the knowledge about the effects of anthelmintics in the environment. Our report includes a compilation of studies conducted on anthelmintics and equine parasites, as well as an experiment which was conducted at the University of Halmstad biogaslaboratory April 2014. Anthelmintics have been shown to have negative impact on the manure ecosystem and especially against manure living fauna. Deworming routines has changed over the years as the equine industry has developed. Nevertheless, there’s still a lack of concrete approach to deworming.

    Download full text (pdf)
    Hästavmaskningsmedels påverkan på miljö och välfärd
  • 10.
    Lindeberg, Jasmine
    et al.
    Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS), Environmental Science.
    Brandt, Victor
    Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS), Environmental Science.
    An evaluation of the effects from livestock farming using water conditions and Odonata species:: Could Odonata act as indicators of eutrophication?2016Independent thesis Basic level (degree of Bachelor), 180 HE creditsStudent thesis
  • 11.
    Lundquist, Kristin
    Halmstad University, School of Business, Engineering and Science.
    Vildsvinsbök i skogsmark – en studie i tre områden i Mellansverige2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In April-July in 2010, three forest dominated areas in central Sweden were studied to investigate wild boar rooting habits. The results showed that rooting mainly occurred in pine-and spruce dominated habitats where tree-ages varied between 45-90 years old and with ground surface vegetation consisting of shrubs (blueberry/lingonberry), mosses and grass. In two of the three study areas the size of rooted areas was not affected by factors such as tree species composition, forest age or vegetation ground cover, but correlations between these factors were found in one of the areas. The size of rooted areas was not affected by the population density or the time with wild boar present in the area.

    Download full text (pdf)
    fulltext
  • 12.
    Sandström, Sofia
    Halmstad University, School of Business and Engineering (SET).
    Stereotypa beteenden hos hästar: Kartläggning av ridanläggningar samt pilotstudie2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Download full text (pdf)
    fulltext
  • 13.
    Strand, John A.
    et al.
    Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS), Environmental Science, Wetland Research Centre.
    Weisner, Stefan E. B.
    Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS), Environmental Science, Wetland Research Centre.
    Combating eutrophication of the sea and enhancing biodiversity of the agricultural landscape: experiences from wetland creation in Sweden2011Conference paper (Other academic)
    Download full text (pdf)
    Strand Weisner IWA2011
  • 14.
    Tonderski, Karin
    et al.
    Department of Physics and Measurement Technology, Biology and Chemstry, Linköping University.
    Weisner, Stefan
    Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS), Environmental Science, Wetland Research Centre.
    Ecological biotechnology in wetlands?2004In: Water research – what’s next? / [ed] Birgitta Johansson, Stockholm: Forskningsrådet Formas , 2004, p. 41-43Chapter in book (Other academic)
    Download full text (pdf)
    FULLTEXT01
  • 15.
    Tsiafouli, Maria A.
    et al.
    Aristotle University,Thessaloniki, Greece.
    Thébault, Elisa
    University Pierre et Marie Curie, Paris, France.
    Sgardelis, Stefanos P.
    Aristotle University,Thessaloniki, Greece.
    de Ruiter, Peter C.
    Wageningen University, Wageningen, The Netherlands.
    van der Putten, Wim H.
    Wageningen University, Wageningen, The Netherlands.
    Birkhofer, Klaus
    Lund University, Lund, Sweden.
    Hemerik, Lia
    Wageningen University, Wageningen, The Netherlands.
    de Vries, Franciska T.
    The University of Manchester, Manchester, United Kingdom.
    Bardgett, Richard D.
    The University of Manchester, Manchester, United Kingdom.
    Brady, Mark Vincent
    Swedish University of Agricultural Sciences (SLU), Lund, Sweden.
    Bjornlund, Lisa
    University of Copenhagen, Copenhagen, Denmark.
    Jørgensen, Helene Bracht
    Lund University, Lund, Sweden.
    Christensen, Sören
    University of Copenhagen, Copenhagen, Denmark.
    D'Hertefeldt, Tina
    Lund University Lund, Sweden.
    Hotes, Stefan
    Justus Liebig University, Giessen, Germany.
    Gera Hol, W.H.
    Wageningen University, Wageningen, The Netherlands.
    Frouz, Jan
    Biology Centre Academy of Sciences of the Czech Republic, Ceske Budejovice, Czech Republic.
    Liiri, Mira
    University of Helsinki, Lahti, Finland.
    Mortimer, Simon R.
    University of Reading, Reading, United Kingdom.
    Setälä, Heikki
    University of Helsinki, Lahti, Finland.
    Tzanopoulos, Joseph
    The University of Kent Canterbury, Kent, United Kingdom.
    Uteseny, Karoline
    University of Vienna, Vienna, Austria.
    Pižl, Václav
    Biology Centre Academy of Sciences of the Czech Republic, Ceske Budejovice, Czech Republic.
    Stary, Josef
    Biology Centre Academy of Sciences of the Czech Republic, Ceske Budejovice, Czech Republic.
    Wolters, Volkmar
    Justus Liebig University, Giessen, Germany.
    Hedlund, Katarina
    Lund University, Lund, Sweden.
    Intensive agriculture reduces soil biodiversity across Europe2014In: Global Change Biology, ISSN 1354-1013, E-ISSN 1365-2486, Vol. 21, no 2, p. 973-985Article in journal (Refereed)
  • 16.
    Waara, Sylvia
    et al.
    Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS).
    Bandaruk, Tatsiana
    Halmstad University, School of Business and Engineering (SET).
    Metal and Metalloid Sequestration in a Constructed Wetland System for Treatment of Landfill Leachate During 2003–20122014Conference paper (Other academic)
    Abstract [en]

    The treatment of landfill leachate in constructed wetland systems is a common practice in Europe. However, very few studies were made to evaluate their performance over a long period of time. A free surface constructed wetland system consisting of sediment traps followed by 10 ponds connected with overflows was built at Atleverket near Örebro, Sweden in 2001. It receives pre-treated leachate from the municipal landfill. As part of the wetland monitoring programme a large data set on the surface concentrations of 15 metals and 2 metalloids has been collected from different sampling sites within the wetland during the operation period. In this study, the data from inlet and outlet of the wetland were compiled and analysed. The aim of this paper is therefore to estimate the removal efficiency of metals and metalloids using data on concentrations and flow and investigate the effect of wetland age on removal pattern. The elements with the highest removal efficiency were Al, As, Ba, Ca, Cr, Cu, Fe, Mn, Pb, V and Zn ranging from 95% for Pb to 65 % for Ca. The elements with the lowest reduction were B, Co K, Mg, Ni and S ranging from Co 56 % to 40 % for S. It was found that the removal efficiency was not related to inlet concentrations of the elements as the elements with high and low inlet concentrations were found in both groups. Analysis of reduction pattern also revealed that the group with higher removal efficiency showed fairly constant outlet concentrations during the study period, while the elements with lower removal efficiency demonstrated variable outlet concentrations. No statistical difference in removal due to age of the wetland was found. The study results showed that the wetland system has high removal efficiency of metals and metalloids and the removal pattern is not affected by age of the wetland. The influence on reduction due to leachate characteristics, wetland design and retention time will be discussed.

    Download full text (pdf)
    atle+2014
  • 17.
    Weisner, Stefan
    et al.
    Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS), Environmental Science, Wetland Research Centre.
    Johannesson, Karin
    Linköpings universitet, Linköping, Sverige.
    Tonderski, Karin
    Linköpings universitet, Linköping, Sverige.
    Näringsavskiljning i anlagda våtmarker i jordbruket: Analys av mätresultat och effekter av landsbygdsprogrammet2015Report (Other academic)
    Abstract [en]

    Measurements of removal of phosphorus and nitrogen in created wetlands in agricultural areas in Sweden have been compiled and analysed. The results indicate the level of phosphorus and nitrogen removal that can be achieved in created wetlands in agricultural areas in Sweden. The results have also been used to develop new models for calculating removal of phosphorus and nitrogen in created wetlands in which measurements have not been done. Finally, these models have been used to estimate the removal effects that can be expected in the wetlands that have received financial support within the Swedish Rural Develop­ ment Programme in 2007–2013, and how much the transport of phosphorus and nitrogen to the sea will decrease due to the creation of these wetlands.

    The new results show that phosphorus removal has been underestimated in earlier measurements as well as in models used in previous evaluations. In individual well designed and located wetlands, a removal of 100 kilo phosphorus and 1 000 kilo nitrogen per hectare wetland area and year can be obtained. The new results also indicate that it should be possible to achieve a removal of 50 kilo phosphorus and 500 kilo nitrogen per hectare wetland area and year in wetland creation programs prioritizing wetlands that are located and designed primarily for nutrient removal. The costs are estimated to 100 SEK per kilo phosphorus and 10 SEK per kilo nitrogen, if 50 percent of the costs are allocated to biodiversity and other ecosystem services.

    Model calculations based on a selection of representative wetlands within the Rural Development Programme were scaled up to the 5 261 hectare wetland area that have been granted financial support during 2007–2013. The evaluation show that the Rural Development Programme will result in a reduced transport to local waters­ heds of about 25 tons of phosphorus and 200 tons of nitrogen per year. Therefore, the transport to the sea will decrease with about 18 tons of phosphorus per year and about 170 tons of nitrogen per year, corresponding to 1.9 and 0.5 percent, respectively, of the transport to the sea from agricultural land.

    Creation of wetlands within the Rural Development Programme has thus resulted in significant decreases of transports of phosphorus and nitrogen to inland waters and the coastal sea. However, a comparison of removal per hectare wetland area and year between what has been achieved within the Rural Development Programme and in individual wetlands suggests that the effect could be substantially increased with a better location and design of wetlands.

    Download full text (pdf)
    fulltext
  • 18.
    Yang, Fan
    Halmstad University, School of Business, Engineering and Science, Biological and Environmental Systems (BLESS).
    Mesophilic anaerobic digestion conducted in single unit reactor at increasing ammonia concentrations2011Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The use of mesophilic anaerobic digestion for treatment of organic wastes is a growing biotechnology for sustainable energy supply. Ammonia inhibition is a major problem in anaerobic digestion mainly when digestion of nitrogen-rich substrates such as livestock wastes and manure occurs. This paper provides a summary of research conducted on ammonia inhibition of the anaerobic process. An experiment with mesophilic digestions of swine manure was conducted in single unit reactors, which were controlled under different ammonia concentrations by addition of NH4Cl in different amounts. From the experimental results, it was shown that NH4Cl could be an effective chemical agent for removing foam and scum in the digester. Methane production was decreased with the increasing NH4Cl addition until a collapse was observed between 11.2 g NH4+-N/l and 13.2 g NH4+-N/l. Contrary to the findings in thermophilic digestion, a dysfunction of acidogenesis was also observed since both gas and methane production was delayed with increasing NH4Cl addition. These findings suggest different ammonia inhibition principles in mesophilic and thermophilic digestion. It was further indicated that methanogenesis could produce a high percentage of methane although gas production was inhibited.

    Download full text (pdf)
    fulltext
1 - 18 of 18
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf