Endre søk
Begrens søket
1 - 36 of 36
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Treff pr side
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sortering
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
Merk
Maxantalet träffar du kan exportera från sökgränssnittet är 250. Vid större uttag använd dig av utsökningar.
  • 1.
    Alere, Ilze
    et al.
    Luleå tekniska universitet.
    Hanaeus, Jörgen
    Particle dynamics in the drinking water distribution network of Luleå1997Inngår i: Vatten, ISSN 0042-2886, nr 4, s. 381-390Artikkel i tidsskrift (Annet vitenskapelig)
    Abstract [sv]

    Partikeldynamik i Luleås dricksvattennät

  • 2.
    Al-Najjar, Nasik
    Växjö universitet, Fakulteten för matematik/naturvetenskap/teknik, Institutionen för teknik och design. Byggteknik.
    FRAMTIDA VATTENFÖRSÖRJNING FÖR VÄXJÖ KOMMUN: BEDÖMNING AV OLIKA ALTERNATIV2008Inngår i: Vatten, ISSN 0042-2886, Vol. 63, nr 4, s. 299-311Artikkel i tidsskrift (Annet vitenskapelig)
    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.
    Amofah, Lea Rastas
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Hanaeus, Jörgen
    Nutrient recovery in a smallscale wastewater treatment plant in cold climate2006Inngår i: Vatten, ISSN 0042-2886, Vol. 62, nr 4, s. 355-368Artikkel i tidsskrift (Annet vitenskapelig)
    Abstract [en]

    An onsite wastewater treatment plant at Brändön, north of Luleå, receiving primarily treated wastewater from a village, was operated and investigated during one year. The wastewater flow was 0.5 m3/d. The main treatment steps were a prefilter, mainly to distribute the flow, a vegetation filter consisting of two different clones of Salix and two phosphorus filters with Filtralite-P and blast furnace slag (BF slag) operated in parallel. The willow bed reduction of BOD7 was in average about 80% and of phosphorus (P) and nitrogen (N) 20-30%. The main mechanism was believed to be filtration in the bed. The reduction through plant uptake was minor. The Filtralite-P filter reduced BOD7, P and N with 67%, 72% and 20%, respectively. The BF slag filter reduced P and N with 53% and 3%, respectively. The release of sulphuric compounds from the BF slag filter increased the BOD7 content in the effluent. The Filtralite-P system achieved the requirements of the normal protection level given by the Swedish Environmental Protection Agency but not all of the requirements of the high protection level. The BF slag system did not fullfil the requirements of the two protection levels.

  • 4.
    Andersson-Chan, Anneli
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Hanaeus, Jörgen
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Odorous wastewater emissions2006Inngår i: Vatten, ISSN 0042-2886, Vol. 62, nr 3, s. 227-236Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The objective of this article is to review odour problems of wastewater treatment facilities and air emission treatment methods. The malodorous wastewater emissions consist of a complex mixture of substances with different properties. A screening of volatile organic and reduced sulphur compounds revealed very low concentrations of individual compounds (< 50 ppb), and only dimethyl sulphide, hydrogen sulphide and methyl mercaptan were found at concentrations above threshold values. Indicating one single compound responsible for the foul odours was not possible. Two case studies are presented and discussed. In the first, a compact biofilter was evaluated for the treatment of gas streams from a sewage pumping station. A rockwool filter media was inoculated with a mixed bacterial wastewater culture that established successfully. However, evaluating the biofilter's performance proved analytically difficult and expensive due to the low concentrations of incoming gases. In the second case study the odour nuisance situation around a wastewater treatment plant was evaluated and a holistic approach to manage the odour problems was developed. An odour panel of local observers worked well, since they got involved in the process. However, using the panel's reports on odour episodes to find the source of the odour was difficult.

  • 5.
    Axberg, C
    et al.
    YKI – Ytkemiska institutet.
    Eriksson, L
    Koagulation and sedimentation vid kemisk fällning1978Inngår i: Vatten, ISSN 0042-2886, Vol. 34, s. 220-229Artikkel i tidsskrift (Fagfellevurdert)
  • 6.
    Bengtsson, Lars
    Luleå tekniska universitet.
    Inverkan av värmeuttag på temperatur- och cirkulationsförhållanden i istäckta sjöar1982Inngår i: Vatten, ISSN 0042-2886, Vol. 38, nr 1, s. 3-16Artikkel i tidsskrift (Annet vitenskapelig)
    Abstract [en]

    Three different circulation mechanisms are analyzed: 1) through-flow of a river; 2) wind generated oscillations; and 3) convective currents induced by heat flow from the bottom sediments. The through-flow takes place between the ice and a depth, which is mainly determined by the conditions at the inlet of the river into the lake. Just below this depth there is a sharp thermocline. The water mass below the thermocline is hardly affected at all by the through-flow. The bottom currents generated by the heat flow from the sediments is found to be of the order up to some tenth of metres per day. The stream velocity is shown to be proportional to the heat flow rate to the power 1/3. In discussing expected effects of withdrawal of heat from ice covered lakes with and without through-flow and heat with drawal with closed and open systems are disinguished. A thermocline is likely to develop also in lakes with no through-flow. The layer close to the ice with a temperature of almost 0 degree C must increase during the course of the winter.

  • 7.
    Bengtsson, Lars
    Luleå tekniska universitet.
    Magrör: ett konservationsprogram för beräkning av dagvattenflöden1980Inngår i: Vatten, ISSN 0042-2886, s. 325-336Artikkel i tidsskrift (Annet vitenskapelig)
    Abstract [en]

    A conversational program, MAGROR, for storm water run-off is described. Such programs are necessary for practical engineering purposes related to storm water run-off. The program will assess storm water run-off and recommend optimal pipe dimensions. The program has an automatic capability. The principle of a connecting system for run-off piping is shown schematically. Theoretical considerations are also presented, including Manning's and Chezy's formulae. A special snow-melt routine is also included. Other systems, SWMM and ILLUDAS, are also discussed and compared with MAGROR

  • 8.
    Bergbäck, Bo
    et al.
    Högskolan i Kalmar, Naturvetenskapliga institutionen.
    Håkansson, K
    Karlsson, S
    Long-range spreading of metals from a mine waste deposit1989Inngår i: Vatten, ISSN 0042-2886, , s. 68-74s. 68-74Artikkel i tidsskrift (Annet vitenskapelig)
  • 9.
    Bryhn, Andreas C.
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Luft- och vattenlära.
    Håkanson, Lars
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Luft- och vattenlära.
    Eklund, Jenny
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper.
    Variabilities and uncertainties in key coastal water variables as a basis for understanding changes and obtaining predictice power in modelling2008Inngår i: Vatten, ISSN 0042-2886, Vol. 64, s. 259-272Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The focus of this work is on general patterns in uncertainty as well as temporal and spatial variability in keywater variables in coastal science and management. These patterns are essential since they regulate how manysamples must be taken to get reliable mean or median values characterising coastal water quality and whichvariables are most suitable for monitoring and predictive modelling. We present results concerning coefficientsof variation, correlations, regressions, variations in data from different time periods, and confidence intervalsfor empirical mean values. We use data from Ringkøbing Fjord (Denmark, N. Europe), Chesapeake Bay(Eastern U.S.) and other coastal marine sites to illustrate the basic principles related to patterns in variability.We have shown that total and particulate N and P generally have much lower coefficients of variability (CV)than dissolved inorganic nutrient fractions. The latter are, hence, of limited use in predictive models for coastalmanagement. Total nitrogen (N) and phosphorus (P) were, on the other hand, found to be useful predictors oftwo standard bioindicators, the Secchi depth (a measure of water clarity) and chlorophyll-a concentrations(a measure of phytoplankton biomass or production)

  • 10.
    Danielsson Tham, Marie-Louise
    Örebro universitet, Restaurang- och hotellhögskolan.
    Salmonnela in Sewage and Sludge: Serological profils of isolates, their removal and/or survival in relation to potential health  hazards to man and animals1978Inngår i: Vatten, ISSN 0042-2886, Vol. 34, nr 2, s. 86-94Artikkel i tidsskrift (Fagfellevurdert)
  • 11.
    Ekelund, Nils
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för naturvetenskap.
    Aronsson, Andreas
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för naturvetenskap.
    Flagellaten Euglena gracilis rörelseförmåga kan avslöja graden av giftighet (kadmium) i vatten med hjälp av metoden ECOTOX. (Orientation of the flagellate Euglena gracilis can identify the toxicity (cadmium) of water using the automatic biotest ECOTOX).2004Inngår i: Vatten, ISSN 0042-2886, Vol. 60, nr 2, s. 77-84Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The interest in testing of water and wastewater for toxic compounds has increased in the last few years with rising pollutant levels from industry and with rising sensibility towards environmental problems. In order to get an early warning signal of environmental conditions the use of unicellular organism are recommended since they respond quickly and are easy to handle. An early warning system, called ECOTOX, for monitoring of water quality has been developed by a research group in Germany (Prof. D.-P. Häder). ECOTOX use movement parameters of the flagellate Euglena gracilis as orientation in the gravity field, the motility and the velocity of the cells. These parameters have been found to be sensitive to toxic compounds. In the present study it was shown that cadmium affect gravitaxis, motility, velocity and compactness of the cells negatively in the concentration interval of 10 to 15 mg l-1 after 24 and 48 h. After short time of incubation (minutes) with cadmium there is an inhibition of the different movements parameters starting at the concentration of 25 mg l-1. Like other biomonitoring systems ECOTOX can be used to detect changes in quality of aquatic systems.

  • 12.
    Fredriksson (numera: Björn), Annika
    et al.
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Nestor, Gustav
    Linköpings universitet, Institutionen för tema, Tema vatten i natur och samhälle. Linköpings universitet, Institutionen för tema, Tema Miljöförändring.
    Svensson, Bo H.
    Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
    Effects of an organotin PVC stabiliser on anoxic degradation of organic matter2003Inngår i: Vatten, ISSN 0042-2886, Vol. 59, nr 4, s. 271-277Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Many organotin compounds are toxic, thus their occurrence in the environment is of considerable concern, and several of these substances are regarded as priority pollutants that require further investigation. Organotins are used primarily as heat stabilisers in PVC plastic, and they are therefore found in landfills in which discarded PVC products have been deposited. In an earlier study, it was found that a widely used methyl tin PVC stabiliser inhibited microbial generation of CH4during anoxic degradation, and the objective of the present study was to elucidate possible mechanisms of such inhibition. CH4 and fermentation products were measured continuously for a period of 219 days in waste material amended with a methyl tin stabiliser. The results show that CH4 formation was retarded for 84-198 days during fermentation of the waste material. Furthermore, it seemed that not only the methyl tins, but also their sulphur organic ligands, play an important role in retarding the formation of CH4. The methyl tin stabiliser apparently affected both the fermentative organisms that provided the substrate for the methanogens, as well as the methanogens.

  • 13.
    Friberg, S
    et al.
    YKI – Ytkemiska institutet.
    Lehtinen, H
    Analys av organisk substans i vattenåterstod från renad skäremulsion1969Inngår i: Vatten, ISSN 0042-2886, Vol. 3, s. 274-277Artikkel i tidsskrift (Fagfellevurdert)
  • 14.
    Govindarajan, Venkatesh
    Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörs- och kemivetenskaper.
    Classroom survey to gauge how the three pillars of sustainability are prioritised for the urban water and wastewater system2017Inngår i: Vatten, ISSN 0042-2886, Vol. 73, nr 1, s. 33-37Artikkel i tidsskrift (Annet vitenskapelig)
  • 15.
    Govindarajan, Venkatesh
    Norwegian University for Science & Technology, Norway.
    Environmental systems analysis of urban water systems - limited historical account of published work in scientific journals2015Inngår i: Vatten, ISSN 0042-2886, Vol. 71, nr 4, s. 209-222Artikkel i tidsskrift (Annet vitenskapelig)
  • 16.
    Govindarajan, Venkatesh
    Norwegian University for Science & Technology, Norway.
    Testing different rehabilitation options in the drinking water pipeline network in Oslo using the Dynamic Metabolism Model2014Inngår i: Vatten, ISSN 0042-2886, Vol. 70, nr 4, s. 215-224Artikkel i tidsskrift (Annet vitenskapelig)
  • 17.
    Govindarajan, Venkatesh
    et al.
    Norwegian University for Science & Technology, Norway.
    Brattebo, Helge
    Norwegian University for Science & Technology, Norway.
    Testing the Power Law on urban water and wastewater pipeline networks2011Inngår i: Vatten, ISSN 0042-2886, Vol. 67, nr 3, s. 153-160Artikkel i tidsskrift (Annet vitenskapelig)
  • 18.
    Govindarajan, Venkatesh
    et al.
    Norwegian University for Science & Technology, Norway.
    Nersund Larsen, Hogne
    Energy and Environment, AsplanViak, Trondheim, Norway.
    Water-energy nexus in urban water utilities: A brief Norwegian outlook2015Inngår i: Vatten, ISSN 0042-2886, Vol. 71, nr 2, s. 101-109Artikkel i tidsskrift (Annet vitenskapelig)
  • 19.
    Grönlund, Erik
    et al.
    Luleå tekniska universitet.
    Johansson, Erica
    Hanaeus, Jörgen
    Falk, Stefan
    Seasonal microalgae variation in a subarctic wastewater stabilisation pond using chemical precipation2004Inngår i: Vatten, ISSN 0042-2886, Vol. 60, nr 4, s. 239-249Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Surface water microalgae samples were collected during the ice-free period in a small subarctic wastewater stabilization pond system, complemented with chemical precipitation during the winter period (fellingsdam), and serving 310 persons. In the primary pond microalgae dominance alternated between the Cryptophyte Cryptomonas and green algae (Chlorophyta). In the second and third pond the general pattern was that Cryptomonas dominated during summer but was replaced by green algae in autumn and the following spring. Estimations of the microalgae part of the effluent COD and phosphorus showed that microalgae dominated these parameters for only 3-4 weeks of 12 evaluated. This does not support the reasoning behind the European Union directive of the use of filtered samples for effluent BOD, COD and SS from stabilization ponds, in contrast to other wastewater treatment methods. The reasons behind the EU's procedure for ponds are based on the assumption that stabilization ponds convert "sewage BOD" to "algal BOD". The results of this study suggest that further investigations of the microalgae function in subarctic wastewater stabilization ponds and fellingsdams should be conducted, before implementing the EC directive into Swedish law, or into similar laws in other countries with subarctic regions.

  • 20.
    Hedelin, Beatrice
    et al.
    Division for Engineering Sciences, Physics and Mathematics, Karlstad University.
    Gustafsson, Jan-Erik
    Department of Land and Water Resources Engineering, KTH.
    Swedish Water Management: A Comparison of some Municipal Master Plans and the Requests of the Water Framework Directive2003Inngår i: Vatten, ISSN 0042-2886, Vol. 59, nr 2, s. 75-80Artikkel i tidsskrift (Annet vitenskapelig)
    Abstract [en]

    A selection of 14 Swedish municipal master plans have been compared with the requirements of future river basin plans, as prescribed in the Water Framework Directive. The municipal master plans can be considered as the main planning documents to provide guidance for decision-making on water use in Sweden. Thus, they represent the long-term plans for water use. The comparison gives a hint on what effect the implementation of the Water Framework Directive will have on the Swedish water management system.The result shows that most of the prescribed contents of the river basin plan are covered very briefly, or not covered at all, in the master plans. Economic analysis, environmental goals and monitoring are issues that are covered in a highly defective way, compared to what is prescribed for the future river basin plans. Only the identification of protected areas are covered to a high extent. The conclusion is that implementation of the Water Framework Directive will not only change the form of administration and management of water resources in Sweden. Many new aspects concerning the substance and content of water management must also be considered in the future.

  • 21.
    Hedström, Annelie
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Nitrogen conversion processes when treating wastewater in soil systems: the importance of ammonium adsorption2000Inngår i: Vatten, ISSN 0042-2886, Vol. 56, nr 2, s. 85-95Artikkel i tidsskrift (Annet vitenskapelig)
  • 22.
    Hedström, Annelie
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Reactive filter systems for small scale wastewater treatment2006Inngår i: Vatten, ISSN 0042-2886, Vol. 62, nr 3, s. 253-263Artikkel i tidsskrift (Annet vitenskapelig)
  • 23.
    Herbert, Roger B
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper.
    Nordqvist, A
    Wiklander, A
    Ericsson, J
    Granular iron reactive barriers for the degradation of chlorinated solvents in groundwater2000Inngår i: Vatten, ISSN 0042-2886, Vol. 56, nr 4, s. 261-266Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper presents the results of batch and column experiments that investigated the degradation of chlorinated solvents bv zerovalent granular iron. These experiments were designed to produce data essential for the installation of a field-scale permeable reactive barrier at a field site with groundwater contaminated bv perchloroethylene (PCE) and other less chlorinated ethenes. The batch tests were conducted in order to identify a suitable iron product for the reactive matrix in a barrier. The test results indicated that an American iron product, because of its greater surface area, was superior in the degradation of PCE relative to other selected granular iron products. The column experiments were designed to determine the rates of PCE, TCE and cis-DCE removal and the column residence times needed to achieve solvent degradation. For a column composed of a mixture of 50% granular iron and 50% sand, the results showed that the time for a 50 % decrease (t50) in solvent concentration was < 1.3 hours for PCE, ca. 1.4 hours for TCE, and ca. 1.9 hours for cis-DCE. These results can be used to dimension a field-scale reactive barrier, where the groundwater residence time must be in excess of these t50 values.

  • 24.
    Hernebring, Claes
    Luleå tekniska universitet.
    Snabba metoder för bestämning av erforderling aluminiumsulfatdos vid ytvattenverk: Rapid methods for the determination of required alum dosage in surface water treatment pla1987Inngår i: Vatten, ISSN 0042-2886, Vol. 43, nr 3, s. 209-219Artikkel i tidsskrift (Annet vitenskapelig)
    Abstract [en]

    Rapid methods to determine the required coagulant dosage to treat humic surface water are described. The tests could be carried out manually or automatically. On-line instruments are described which might act as coagulant dose sensors. Their design was based on two principles, directly or indirectly connected to the chemical precipitation process. One method used ultraviolet light absorbance measurements to quantify the humic content. Jar tests with different raw water had shown that the required coagulant dosage was linearly dependent on the humus concentration thus measured. For the other method, the precipitation process was characterized by turbidity measurements immediately after chemical addition

  • 25.
    Johansson, Emma
    et al.
    Karlstads universitet.
    Govindarajan, Venkatesh
    Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörs- och kemivetenskaper.
    Wastewater treatment plants as energy producers: Comparison of status quo in Sweden and India.2018Inngår i: Vatten, ISSN 0042-2886Artikkel i tidsskrift (Annet vitenskapelig)
    Abstract [en]

    As the population of the world rises and economies grow, both energy and water will be needed in ever-increasing quantities. There is a delicate balance between these two resources called the energy-water (or the water-energy) nexus. One way to reduce the energy consumption associated with wastewater treatment is to use the sludge produced during the process to generate biogas. In most countries in the developed world, the coverage, standards and reliability of wastewater treatment are high.  But as the countries in the developing world are striving towards the living standards of those in the developed world, even as they combat population pressure, it is  imperative that they  learn from the experiences (the mistakes which occurred during the ‘learning-by-doing’ process) of the developed world. In this paper, Sweden has been used as a proxy for the developed world with a well-functioning sanitation infrastructure and reliable power supply; and India (the home country of one of the coauthors) is a proxy for the developing world which lacks the same. A very important starting point for development would be to educate people about the long-term socio-economic and environmental benefits of wastewater treatment.

     

  • 26.
    LeBell, JC
    YKI – Ytkemiska institutet.
    Municipal sewage water treatment - some colloid chemical aspects : Part I.Basic considerations1982Inngår i: Vatten, ISSN 0042-2886, Vol. 38, s. 285-293Artikkel i tidsskrift (Fagfellevurdert)
  • 27.
    LeBell, JC
    YKI – Ytkemiska institutet.
    Municipal sewage water treatment - some colloid chemical aspects : Part II.Experimental results1982Inngår i: Vatten, ISSN 0042-2886, Vol. 38, s. 294-305Artikkel i tidsskrift (Fagfellevurdert)
  • 28.
    Levlin, Erik
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Mark- och vattenteknik (flyttat 20130630), VA-teknik, Vatten, Avlopp och Avfall.
    Maximering av slam och biogasproduktion för att motverka global uppvärmning2010Inngår i: Vatten, ISSN 0042-2886, Vol. 66, nr 1, s. 67-73Artikkel i tidsskrift (Annet vitenskapelig)
    Abstract [en]

    Can wastewater treatment contribute to counteract global warming? Increased biogas production for substitutingfossil fuel is one possibility. However, an active sludge process with biological nitrogen and phosphorus removalconsume organic material, gives a sludge with less digestibility and need energy for aeration. The amountof produced sludge corresponds to half of the organic material in the sewage water. If the degree of digestion is40 % it means that 20 % of the organic content have been transformed to biogas. Anaerobic digestion of thesewage water can give 60 to 80 % conversion of organic material in the sewage water to biogas and thereby 3 to4 times larger biogas production. However, if maximum amount of the carbon source is used for biogas productionthere will be no carbon source for biological nutrient removal. Therefore new methods for nutrient removalwithout carbon source has to be developed, for which struvite precipitation and can anammox be used. Thepilot plant Hammarby Sjöstadsverk is a unique resource owned by KTH and IVL Swedish EnvironmentalInstitute,which can be used for these studies. Also the possibility to use sewage sludge to counteract globalwarming by recycling carbon to deep see sediments should be studied.

  • 29. Linderholm, K.
    et al.
    Palm, O.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, JTI Institutet för Jordbruks- och Miljöteknik.
    Persson, P.
    Plant availability of phosphorus in ash, calcium phosphate and different types of sewage sludge2003Inngår i: Vatten, ISSN 0042-2886, Vol. 59, s. 161-167Artikkel i tidsskrift (Fagfellevurdert)
  • 30. Lindmark, Gunilla
    et al.
    Bengtsson, Lars
    Luleå tekniska universitet.
    Influence of interstitial water on growth of Selenastrum capricornutum in water from lake Södra Bergundasjön1979Inngår i: Vatten, ISSN 0042-2886, Vol. 35, nr 3, s. 222-235Artikkel i tidsskrift (Annet vitenskapelig)
  • 31. Marklund, Stefan
    et al.
    Mäkitalo, Lars-Inge
    Luleå tekniska universitet.
    Base WASA: Antarctic wastewater treatment and zero discharge1993Inngår i: Vatten, ISSN 0042-2886, Vol. 49, nr 2, s. 104-109Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Wastewater treatment was evaluated in a full-scale test during 1991-1992 at the Swedish Antarctic summer base. Approximately 59 litres wastewater per d was generated per person, including flows from 1 urinal but not from the dry toilets. Treatment consisted of a primary septic tank followed by a shallow aerobic biofilter filled with synthetic media. The filter removed 50 per cent of the influent COD but increases in phosphate and ammonia occurred. The solar evaporation of primary-treated wastewater was investigated. Tests were performed in a prefabricated tower ventilated with solar-heated air. The daily practical evaporation capacity was estimated as 4-5 litres per d.m2 of solar collector surface area

  • 32.
    Palmquist, Helena
    Luleå tekniska universitet.
    Substance flow analysis of hazardous substances in a Swedish municipal wastewater system2004Inngår i: Vatten, ISSN 0042-2886, Vol. 60, nr 4, s. 251-260Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In a comparative substance flow analysis two wastewater management scenarios in the Swedish town of Surahammar were assessed - a Conventional Scenario vs. a Separating Scenario. The study was restricted to a selection of 16 representative hazardous substances, including metals and organic compounds. Quantitative data of the selected hazardous substances - their presence in grey- and blackwater, and their reduction rates in the wastewater treatment plant - were gathered from the literature and our own studies. The Conventional Scenario caused an overall higher flow of the selected hazardous substances to the surrounding nature. However, the difference between both scenarios regarding emissions of hazardous substances to the receiving water was small. In general, the Separating Scenario resulted in a significantly smaller flow of hazardous substances to arable land than the Conventional Scenario. A possible management approach was suggested to be used to interpret and compare different wastewater systems, and serve to find out if and how much the flow of hazardous substances can be stopped, diverged, or transformed at the source or during transport throughout the system. System design, process barriers, and organisational and behavioural barriers were suggested, but only the first two were assessed in this study.

  • 33.
    Sellgren, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Economical use of water in the extraction of ores: some aspects1980Inngår i: Vatten, ISSN 0042-2886, Vol. 36, nr 4, s. 312-321Artikkel i tidsskrift (Annet vitenskapelig)
  • 34.
    Sellgren, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
    Recirkulation av processvatten i anrikningsverk: en energiresurs1983Inngår i: Vatten, ISSN 0042-2886, Vol. 39, nr 1, s. 78-87Artikkel i tidsskrift (Annet vitenskapelig)
    Abstract [en]

    Savings in energy and water can be effected at Swedish ore-dressing plants if tailings slurry can be thickened more effectively. Most of the water could be re-used directly allowing recovery of energy (heat). The potential in Swedish mines is about 50 GWh, and most of the energy savings would replace oil . The water balance, pH, metal content and sulphate ion content at the Garpenberg works are shown. The degree of direct circulation in the complex flotation of sulphide ores is limited by water-quality problems

  • 35.
    Szatkowska, Beata
    et al.
    KTH, Tidigare Institutioner, Mark- och vattenteknik.
    Plaza, Elzbieta
    KTH, Tidigare Institutioner, Mark- och vattenteknik.
    Trela, Jozef
    KTH, Tidigare Institutioner, Mark- och vattenteknik.
    Hultman, Bengt
    KTH, Tidigare Institutioner, Mark- och vattenteknik.
    Monitoring Of Nitrogen Removal Processes By Use Of Conductivity Measurements: [Övervakning av kvävereduktionsprocesser med hjälp av konduktivitetsmätningar]2004Inngår i: Vatten, ISSN 0042-2886, Vol. 60, nr 2, s. 111-118Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A newly developed technology for nitrogen removal from ammonium-rich streams comprises two biological steps. In the first step, about half of the ammonium is oxidized to nitrite (partial nitritation) and in the second one, the remaining ammonium reacts with the formed nitrite into nitrogen gas (Anammox; anaerobic ammonium oxidation). The system was studied in a laboratory-scale pilot plant at the Royal Institute of Technology (KTH) and in a pilot plant located at the Himmerfjärden Wastewater Treatment Plant (WWTP). Both plants were supplied with ammonium-rich supernatant from digested sludge dewatering. Kaldnes rings were used as biofilm carriers. The process performance was closely monitored by analysis of different nitrogen fractions, COD, alkalinity and measurements of pH, oxygen concentration and temperature. Additionally, conductivity measurements were performed. It was found that conductivity is an excellent method to monitor the nitrogen removal processes. Such observation is based on the fact that the supernatant main salt is ammonium hydrogen carbonate, which further during the processes is converted to the carbon dioxide and nitrogen gas molecules. Theoretically calculated conductivity values were in good agreement with the experimental data. Conductivity turns out to be a reliable and Inexpensive method to evaluate different biological nitrogen removal processes used for separate treatment of supernatant.

  • 36.
    Trela, Jozef
    et al.
    KTH, Tidigare Institutioner, Mark- och vattenteknik.
    Plaza, Elzbieta
    KTH, Tidigare Institutioner, Mark- och vattenteknik.
    Szatkowska, Beata
    KTH, Tidigare Institutioner, Mark- och vattenteknik.
    Hultman, Bengt
    KTH, Tidigare Institutioner, Mark- och vattenteknik.
    Bosander, Jan
    Dahlberg, Alf Göran
    Deammonifikation Som En Ny Process För Behandling Av Avloppsströmmar Med Hög Kvävehalt: [Deammonification as a new process for treatment of wastewater with a high nitrogen content]2004Inngår i: Vatten, ISSN 0042-2886, Vol. 60, nr 2, s. 119-127Artikkel i tidsskrift (Annet vitenskapelig)
    Abstract [en]

    Pilot plant-scale experiments have been carried out to study a new technology for nitrogen removal from digester supernatant. The plant comprises two parallel lines, which now operate as a two-step process. Two pilot plant reactors (each volume of 2 m3) were filled with Kaldnes rings up to 50 % of their volume. In the First step of the process, half of the ammonium is oxidized to nitrite without further oxidation to nitrate (nitritation). Then the second step follows, where equal amounts of ammonium and nitrite reacts to form nitrogen gas (Anammox). The pilot plant is continuously fed with supernatant from digested sludge dewatering process at the Himmerfjärden WWTP. This type of wastewater has a high ammonium concentration and a low content of biodegradable organic matter.

1 - 36 of 36
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf