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  • 1.
    Albertsen, Henrik
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Lindberg, Amanda
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Lokalt omhändertagande av dagvatten på bostadsfastigheter2016Independent thesis Basic level (professional degree), 180 HE creditsStudent thesis
    Abstract [sv]

    Ett behov finns av att fördröja dagvatten innan det släpps på det kommunala ledningsnätet för att minska flödestopparna och undvika överbelastning. Studien avser att ta fram en förenklad metod för val och utformning av LOD-metod som är anpassad för privata fastighetsägare.

    Ett flertal LOD-anläggningar samt förutsättningar kring dessa har undersökts. Studien har gett en grundläggande information och en beräkningsgång som har förenklats, är lätt att följa och som kan anpassas efter befintliga förutsättningar och önskemål. 

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  • 2.
    Al-Najjar, Nasik
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design. Byggteknik.
    FRAMTIDA VATTENFÖRSÖRJNING FÖR VÄXJÖ KOMMUN: BEDÖMNING AV OLIKA ALTERNATIV2008In: Vatten, ISSN 0042-2886, Vol. 63, no 4, p. 299-311Article in journal (Other academic)
    Abstract [sv]

    Water supply in Växjö municipality has since 1887 been based on surface water from Helga lake. A water treatment plant was built in 1957 and was extensively reconstructed in 1969 but there are still problems to accomplish with drinking water quality, mainly related to temperature, smell and taste, managanese and aluminum rest. Present water consumption periodically approached the water treatment plant maximum capacity. A performed risk analysis showed that catastrophic consequences for the water supply could occur due to an accident in a nearby traffic route or discharges from an industrial area.

    In 1997 Växjö municipality decided to perform a comprehensive investigation of different alternatives for future water supply. Seven alternatives were evaluated including remedial measures at the present water treatment plant. The chosen alternative was based on supply and conveying ground water from Berga esker at Ljungby municipality. Re-infiltration of ground water will be used to guarantee required water quality and quantity and will be implemented in autumn 2008 with a planned supply of 200 l per second delivered to about 70.000 persons in the municipalities of Växjö and Alvesta. The article describes the different alternatives, motives for the chosen alternative and the evaluation procedure.

  • 3.
    Al-Najjar, Nasik
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design. Byggteknik.
    Hultman, Bengt
    Cost-Effective Water Supply and Sanitation2008In: 2nd-Environmental Conference-Water (KECW007), Dohuk Kurdistan Region in Iraq, 2008Conference paper (Refereed)
    Abstract [en]

    Water supply and sanitation have about the same goals all over the world. The needs for safe water supply and sanitation are obvious although not generally implemented. This depends often on the economical situation and bad management. Additional factors are effects of war actions and natural disasters as flooding of rivers and tsunamis. The strategies are, however, similar independent of the actual conditions. In this paper the strategies as developed in Sweden are described related to practical implementation of technology and management strategies. The experiences have shown on both mistakes and successful handling. Today, Sweden is involved in both adjusting policies according to European Union rules (as EU Water Framework Directive) and also in sharing experiences to facilitate international implementation of cost-effective methods.

  • 4.
    Al-Najjar, Nasik
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design. Byggteknik.
    Hultman, Bengt
    VA - SITUATIONEN I IRAK: PROBLEM OCH MÖJLIGHETER TILL MOTÅTGÄRDER2004In: VATTEN: Tidskrift för vattenvård, ISSN 0042-2886, Vol. 60, no 4, p. 269-274Article in journal (Other academic)
    Abstract [sv]

    A summary is given on the water and wastewater situation in Iraq before the Gulf war 1991, the situation after the Gulf war and the recent effects of the conflict 2003. The access of safe water was halved in certain counties after March 2003 and half of the sewage works was out of function with a discharge of untreated wastewater to rivers and channels. The supply of electricity was less than 4 hours per day in January 2004 and caused discharges of untreated sewage on streets etc. Leakage from the water net was estimated to 60%. The wastewater system in 3 out of 5 schools was estimated to be out of function and epidemics have especially affected children and caused an increased mortality. Special issues as illegal openings of water pipes and security have worsened the situation. Swedish knowledge in water and wastewater handling may have an important role in rebuilding water and wastewater handling in Iraq and different possibilities are given.

  • 5.
    Al-Najjar, Nasik
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Hultman, Bengt
    KTH, Stockholm.
    Water management and technology in Swedish municipalities.: Assessment of possibilities of exchange and transfer of experiences.2009In: An International Perspective on Environmental and Water Resources Conference, 2009Conference paper (Refereed)
    Abstract [en]

    The water and wastewater infrastructure began to be developed in Sweden more than one hundred years ago. Much attention was given, in the beginning, to fire prevention and hygienic problems with water borne diseases. Somewhat later storm sewers (combined system) were constructed to remove storm water and wastewater and then successively more efficient wastewater treatment plants were developed. Today water and wastewater handling is seen as a multidisciplinary subject where also attention is given to possible effects of climate changes and possibilities for resources recovery.

    Implementation of advanced water and wastewater systems involves not only different technologies but also effective administration and legislation. The implementation may be on national (also involving EU directives), regional and local scale. As a case study, the local implementation will be illustrated for the municipality Växjö in South Sweden with about 80,000 inhabitants.

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  • 6.
    Andersson Chan, Anneli
    et al.
    Växjö kommun, Tekniska förvaltningen, Sweden.
    Johansson, Niklas
    Växjö kommun, Tekniska förvaltningen, Sweden.
    Christensson, Magnus
    AnoxKaldnes, Lund, Sweden.
    Increased nitrogen removal in existing volumes at Sundet wastewater treatment plant, Växjö2014In: Water practice and technology, E-ISSN 1751-231X, Vol. 9, no 2, p. 215-224Article in journal (Refereed)
    Abstract [en]

    Many wastewater treatment plants need to improve their nitrogen removal due to stricter requirements and increasing loads. This often means larger bioreactor volumes, which can be very expensive and is sometimes impossible if space is limited. Therefore, there is a need for compact hybrid solutions that can increase capacity within existing volumes. Two full-scale demonstration projects using moving bed biofilm reactor (MBBR) technology has proven to be an efficient way to treat nitrogen in existing volumes at Sundet wastewater treatment plant in Växjö. Increased nitrification and denitrification capacity in parts of the main stream were demonstrated through the Hybas™ process, a combination of MBBR and activated sludge using the integrated fixed-film activated sludge technology. The ANITA™ Mox process, using autotrophic N-removal through anaerobic ammonium oxidation (anammox), provided high nitrogen removal for the sludge liquor. Data collected on-site for over a year are analyzed and compared with the performance of conventional treatment systems. These two full-scale demonstration projects have been a successful learning experience in identifying and correcting both process and operational issues, which may not have arisen at pilot scale. The set objectives in terms of nitrogen removal were met for both processes and design modifications have been identified that will improve future operation at Sundet WWTP.

  • 7.
    Andersson, Sandra
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Bengtsson, Linn
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Utredning och analys av en vattenreservoars utformning och dimensioneringsprocess2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The essay contains an assessment of water reservoirs, where an examination and analysis of storage volumes and construction solutions are carried out. Today there are no clear guidelines for how reservoirs in smaller communities should be designed and dimensioned to ensure water quality and guarantee a safe water supply. The goal and purpose of the essay is to calculate a storage volume, identify important aspects to consider in designing a reservoir, and present advantages with and the need of a water reservoir based on consumption variations. The assessment is limited to Lammhults’s conditions where interviews, observations, literature studies, analyses and calculations serve as a foundation for the theory and the result. The result demonstrates, among other things, difficulties, difficulties in analyzing consumption variations, the importance of local correct statistics and questioning of existing methods of dimensioning a storage volume. The essay partially some problem areas, but further studies are required to find solutions in the sector and straight guidelines regarding dimensions and design of reservoirs. 

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  • 8.
    Bollvik, Mikael
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Svensson, Pontus
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Dagvattenhantering på Arenastaden i Växjö2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Rapporten behandlar projekteringen och genomförandet kring det lokala omhändertagandet av dagvatten för de fyra nybyggda arenorna på Arenastaden i Växjö. Granskningen behandlar framförallt underjordiska fördröjningsmagasin men även alternativa lösningar.

    Arbetet har genomförts med hjälp av intervjuer och studier kring olika lösningar för lokalt omhändertagande av dagvatten.

    Förändringsförslagen som presenteras bottnar i mer tid för projektering, förbättrad kommunikation och större användande av mer genomsläppliga ytor.

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    Dagvattenhantering på Arenastaden i Växjö
  • 9.
    Christensson, Magnus
    et al.
    AnoxKaldnes AB, Lund, Sweden.
    Ekström, Sara
    AnoxKaldnes AB, Lund, Sweden.
    Andersson Chan, Anneli
    Tekniska Forvaltningen, Vaxjo, Sweden.
    Le Vaillant, Eric
    AnoxKaldnes AB, Lund, Sweden.
    Lemaire, Romain
    Veolia Water Tech Dept, France.
    Experience from start-ups of the first ANITA Mox Plants 2013In: Water Science and Technology, ISSN 0273-1223, E-ISSN 1996-9732, Vol. 67, no 12, p. 2677-2684Article in journal (Refereed)
    Abstract [en]

    ANITA (TM) Mox is a new one-stage deammonification Moving-Bed Biofilm Reactor (MBBR) developed for partial nitrification to nitrite and autotrophic N-removal from N-rich effluents. This deammonification process offers many advantages such as dramatically reduced oxygen requirements, no chemical oxygen demand requirement, lower sludge production, no pre-treatment or requirement of chemicals and thereby being an energy and cost efficient nitrogen removal process. An innovative seeding strategy, the 'BioFarm concept', has been developed in order to decrease the start-up time of new ANITA Moxinstallations. New ANITA Mox installations are started with typically 3-15% of the added carriers being from the 'BioFarm', with already established anammox biofilm, the rest being new carriers. The first ANITA Mox plant, started up in 2010 at Sjolunda wastewater treatment plant (WWTP) in Malmo, Sweden, proved this seeding concept, reaching an ammonium removal rate of 1.2 kgN/m(3) d and approximately 90% ammonia removal within 4 months from start-up. Thisfirst ANITA Mox plant is also the BioFarm used for forthcoming installations. Typical features of this first installation were low energy consumption, 1.5 kW/NH4-N-removed, low N2O emissions, <1% of the reduced nitrogen and a very stable and robust process towards variations in loads and process conditions. The second ANITA Mox plant, started up at Sundets WWTP in Vaxjo, Sweden, reached full capacity with more than 90% ammonia removal within 2 months from start-up. By applying a nitrogen loading strategy to the reactor that matches the capacity of the seeding carriers, more than 80% nitrogen removal could be obtained throughout the start-up period.

  • 10.
    Davidsson, Åsa
    et al.
    Lund University, Sweden.
    Kjerstadius, Hamse
    Lund University, Sweden.
    Haghighatafshar, Salar
    Lund University, Sweden.
    Fick, Jerker
    Umeå University, Sweden.
    Eriksson, Eva
    Technical University of Denmark, Denmark.
    Olsson, Mikael Emil
    Technical University of Denmark, Denmark.
    Wachtmeister, Hilla
    Technical University of Denmark, Denmark.
    Cour Jansen, Jes la
    Lund University, Sweden.
    Effect of anaerobic digestion at 35, 55 and 60 °C ON pharmaceuticals and organic pollutants2013In: Presented at the 1st International IWA Conference on Holistic Sludge Management, Västerås, Sweden, May 6-8, 2013, 2013, p. 1-8Conference paper (Refereed)
    Abstract [en]

    The application of treated sewage sludge on farmland is a suggested method for recycling nutrients and reducing demand for commercial fertilizer. However sludge needs to be rendered safe from possible contaminants which can cause acute and long-term health and environmental problems. Residual pharmaceuticals and organic contaminants in sludge are mentioned as emerging threats since wastewater treatment plants are not designed to degrade these substances thus yielding an accumulation in sludge. The aim of this study was to evaluate the presence, and reduction, of pharmaceuticals and polycyclic aromatic hydrocarbons (PAHs) during anaerobic digestion at 35, 55 and 60ºC and during pasteurization at 70°C. The substrate used was mixed primary and secondary sludge from a 300 000 person-equivalents municipal wastewater treatment plant in southern Sweden. In general no reduction of pharmaceuticals could be observed at any temperature or minimum exposure time, except for the beta-blocker Irbesartan and the antibiotic Trimethoprim. The results from pharmaceuticals in mesophilic sludge agreed with results in recent Swedish studies. Also, no reduction of PAHs during digestion or pasteurization (70°C – 1 hour) was seen, but for single PAHs digestion could lead to reduction.

  • 11.
    Forss, Jörgen
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Welander, Ulrika
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Biodegradation of Textile Dyes Based on Wood Carriers2010In: Proceedings of Linnaeus SCO-TecH'10 / [ed] Fabio Kaczala, Sandrine Arzur, Ida Tjäder, William Hogland, Linnaeus University , 2010, p. 267-277Conference paper (Other academic)
    Abstract [en]

    Biodegradation of textile dyes from the azo class by Bjerkandera sp.and microbial consortium from forest residues. Bjerkandera’s degradation ability was evaluated in unsterile environment and put out of competition from the microbial consortium inhabiting forest residues. Microorganisms from forest residues were evaluated and transferred to soft wood shavings with maintained biodegrade performance. A continuous system was created containing anaerobic and aerobic parts and a successful degradation was monitored by spectrophotometer and High pressure liquid chromatography (HPLC).

  • 12.
    Karlsson, Patrik
    et al.
    Linnaeus University, Faculty of Technology, Department of Building and Energy Technology.
    Freidh, Magnus
    Linnaeus University, Faculty of Technology, Department of Building and Energy Technology.
    Uppföljning av dagvattenmagasin på Lärkgatan i Växjö stad.: Monitoring of storm water management on Lärkgatan in Växjö city.2013Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Dagvattenmagasin byggs för att fördröja och avlasta ledningssystemet dådagvattenmängderna i dem är stora för att sedan leda tillbaka vattnet i ledningssystemetnär vattenmängderna har sjunkit.

    Examensarbetet syftar till att undersöka och analysera vad som behövs göras för attanvända ett dagvattenmagsinet som är dimensionerat för tioårsregn redan vid femårs- ochtvåårsregn.

    Arbetet grundas på fältstudier och analys av hur systemet är uppbyggt. . Beräkningar hargjorts för studera flöden i ledningar och fyllnadsgrad i magasin. Resultatet visar att det ärmöjligt att med relativt enkla åtgärder kunna utnyttja det aktuella magasinet redan vid 2-och 5-årsregn.

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    Uppföljning av dagvattenmagasin på Lärkgatan i Växjö stad
  • 13.
    Stenis, Jan
    et al.
    LundaHydro AB, Sweden.
    Hogland, William
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Flow analysis and economic modelling theory2018In: 18th International Multidisciplinary Scientific GeoConference and Mining Ecology Management, SGEM 2018, Sofia: International Multidisciplinary Scientific Geoconference , 2018, Vol. 18, no 5.3, p. 389-394Conference paper (Refereed)
    Abstract [en]

    This study shows how material and immaterial flows can be analysed. The basis for the analysis is the equality principle and its mathematical expression the EUROPE model (the model for Efficient Use of Resources for Optimal Production Economy) which creates economic incentives to improve nature, advance the technological standard and increase profits. Particularly, the flows of cargo transportation, mega city supplies, long distance water transportation and various substance flows are described. The theoretical findings show viability for in general improving material and immaterial flows as well as the economy, the technological standard and the living conditions in the geographical regions in question. It is concluded that The EUROPE model based on the equality principle is in theory applicable on transportation policy issues, supplies to major cities, long distance water supply and important substance flows. In general, it is recommended to apply the EUROPE model when undertaking projects involving: transportation, mega city supply; transportation of water over long distances, and; flows of various substances.

  • 14.
    Vianna, Marco Tadeu Gomes
    et al.
    Rio de Janeiro State University, Brazil.
    Marques, Marcia
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Bertolino, Luiz Carlos
    Centro de Tecnologia Mineral CETEM, Brazil.
    Sun coral powder as adsorbent: Evaluation of phosphorus removal in synthetic and real wastewater2016In: Ecological Engineering: The Journal of Ecotechnology, ISSN 0925-8574, E-ISSN 1872-6992, Vol. 97, p. 13-22Article in journal (Refereed)
    Abstract [en]

    Two exotic species introduced during the 90 s known as sun coral currently spread along 2000 km of the Brazilian coast pose a severe threat to the marine biodiversity. Since they have exoskeletons with high concentration of calcium carbonate, the present investigation focused on the removal of phosphorus from wastewater, using exoskeleton's powder in three forms: raw (RSC); physically modified (SCA) and chemically modified (SCC). A Central Composite Design with Response Surface Methodology was applied to the assays along to studies of kinetics, thermodynamics and equilibrium and sorbent's characterisation by FTIR, XRD and SEM-EDX techniques. The maximum P removal capacities of RSC, SCA and SCC were 6826, 7062 and 9597 mg P kg−1, respectively. In all cases, the adsorption followed the Langmuir's pseudo-second-order kinetic model being the process thermodynamically appropriate. The sun coral-based adsorbent is an attractive option for wastewater treatment and may contribute to the control of the sun coral population.

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