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  • 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.
    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.

  • 3.
    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.

  • 4.
    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.

  • 5.
    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

  • 6.
    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.

  • 7.
    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)
  • 8.
    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)
  • 9.
    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

  • 10. 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)
  • 11. 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

  • 12.
    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.

  • 13.
    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)
  • 14.
    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

1 - 14 of 14
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