| 1. |
- Adell, Anna, et al.
(författare)
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Open-access portal with hindcast wave data for Skåne and Halland
- 2021
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Ingår i: Vatten: tidskrift för vattenvård /Journal of Water Management and research. - 0042-2886. ; 77:2, s. 81-90
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Wave climate data for the Swedish provinces Skane and Halland, were hindcast using SWAN, a third-generation spectral wave model. The 40-year wave dataset, from 1979 to 2019, is made available through an open-access data portal (https://gis.sgi.se/vagmodell/). The wave data has a three-hour resolution and includes significant wave height, peak wave period, and wave direction. The wave model domain encompasses the Baltic Sea, Öresund, Kattegat, and Skagerrak. Along the coast of Skane and Halland, the spatial resolution of the computational nodes, from which data can be extracted in the portal, is 250 m. In the offshore areas, the resolution of the computational grid is coarser. The simulated significant wave height was validated against observations from 25 wave gauges, operating intermittently during the simulation period. The coefficient of determination, R2, for these comparisons ranged from 0.46 to 0.93 for the different stations. For 15 wave gauges, R2 values for the comparisons exceeded 0.80. The wave model will continuously be updated and developed.
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| 2. |
- Ahlman, Stefan, 1973
(författare)
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SEWSYS – ett verktyg för att bestämma källor till dagvattenföroreningar och pröva olika åtgärder
- 2006
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Ingår i: Vatten. - 0042-2886. ; 62:1, s. 39-48
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Dagvatten transporterar stora mängder toxiska ämnen till våra vattendrag. En substansflödesmodell har utvecklatsför att möjliggöra analys av scenarier relaterade till föroreningsminskande åtgärder och källkontroll.Datormodellen har fått namnet SEWSYS och innefattar generering och transport av föroreningar i urbanaavrinningsområden. Föroreningarnas källor är också beskrivna i modellen och inkluderar exempelvis materialkorrosion,bromsslitage och däckslitage. SEWSYS främsta egenskap är möjligheten att analysera föroreningaroch dess mängder utifrån de bidragande källorna. För närvarande hanterar modellen 20 olika substanser sominnefattar näringsämnen, metaller och organiska föroreningar. Det är möjligt att simulera både dagvatten ochhushållsspillvatten, antingen i kombinerade eller i duplikata avloppssystem. Modellens möjligheter demonstrerasi denna artikel genom ett urval av resultat från två tillämpade studier där SEWSYS använts för substansflödesmodellering.Baserat på den detaljnivå som modellen har i beräkningarna av dagvattenföroreningar ocherfarenheter från flera tillämpade studier har SEWSYS visats sig vara ett användbart verktyg för att simuleradagvattenföroreningar och utvärdera åtgärder som bygger på källkontroll.
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| 3. |
- Al-Najjar, Nasik
(författare)
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FRAMTIDA VATTENFÖRSÖRJNING FÖR VÄXJÖ KOMMUN : BEDÖMNING AV OLIKA ALTERNATIV
- 2008
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Ingår i: Vatten. - : Föreningen Vatten. - 0042-2886. ; 63:4, s. 299-311
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- 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.
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| 4. |
- Al-Najjar, Nasik
(författare)
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The future water supply of Växjö municipality – evaluation of different alternatives
- 2007
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Ingår i: Vatten. - : Föreningen Vatten. - 0042-2886. ; 63:4, s. 299-312
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The water supply in Växjö municipality has since 1887 been based on surface water from Lake Helgasjön. 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, manganese and aluminium rest. The present water consumption has 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 the Berga Esker in Ljungby municipality. Re-infiltration of ground water will be used to guarantee the 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.
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| 5. |
- Al-Najjar, Nasik, et al.
(författare)
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The water and wastewater situation in Iraq – problems and possibilities for counter-measures
- 2004
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Ingår i: Vatten. - : Föreningen Vatten. - 0042-2886. ; 60:4, s. 269-274
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- A summary is given of 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 in 2003. The access of safe water was halved in certain governorates after March 2003 and half of the sewage works were out of function with a discharge of untreated wastewater into 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. The leakage from the water net was estimated at 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 increased mortality. Special issues like the illegal openings of water pipes and security have worsened the situation. The Swedish knowledge of water and wastewater handling may have an important role in rebuilding water and wastewater handling in Iraq and different possibilities are exemplified.
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| 6. |
- Al-Najjar, Nasik, et al.
(författare)
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VA - SITUATIONEN I IRAK : PROBLEM OCH MÖJLIGHETER TILL MOTÅTGÄRDER
- 2004
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Ingår i: VATTEN: Tidskrift för vattenvård. - : Föreningen Vatten. - 0042-2886. ; 60:4, s. 269-274
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- 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.
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| 7. |
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| 8. |
- Aljaradin, Mohammad, et al.
(författare)
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Evaluation of using grey water as an alternative irrigation source in Jordan
- 2011
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Ingår i: Vatten: tidskrift för vattenvård /Journal of Water Management and research. - 0042-2886. ; 67:2, s. 119-122
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Tidskriftsartikel (refereegranskat)abstract
- One option for coping with wasteful uses of fresh water in landscape irrigation is to use the treated greywater(GW). In the present study, an evaluation of a simple treatment system for reusing GW to irrigate green areas,trees, and ornamentals all over the campus in Tafila Technical University (TTU), Jordan, is presented. After 12 months of using the treatment system, the necessity for using fresh water as irrigation source was reduced. Meanwhile, the area of tree covered land increased from 2.3 ha to 8.4 ha and a 0.5 ha grass areas were introduced in the campus area. In conclusion, the use of a GW as alternative irrigation source is considered an effective method for saving fresh water and increasing green area at the campus.
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| 9. |
- Amofah, Lea Rastas, et al.
(författare)
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Nutrient recovery in a smallscale wastewater treatment plant in cold climate
- 2006
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Ingår i: Vatten. - 0042-2886. ; 62:4, s. 355-368
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- 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.
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| 10. |
- Andersson-Chan, Anneli, et al.
(författare)
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Odorous wastewater emissions
- 2006
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Ingår i: Vatten. - 0042-2886. ; 62:3, s. 227-236
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Tidskriftsartikel (refereegranskat)abstract
- 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.
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