19 uppsatser · sida 1 av 2
en förstudie på förväntad kväveavskiljning och lämplig växtlighet
… wastewater plant (wwp) in Norrtälje municipality. The wwp had to decrease the nitrogen discharge to reach the limit 15 mg tot-N/l. The nitrogen in the outlet was mainly in the form of nitrate, hence the wetland mainly ought to support denitrification. The proposed area for the …
Design för optimal hydrologi och kväverening
… by the governments concerned. In Sweden, regulations concerning the allowed nitrogen (N) concentration in the effluent water from wastewater treatment plants are being tightened up. The Rimbo wastewater treatment plant has been imposed to reduce the annual mean concentration of …
en förändringsstudie av småvatten i Skåne och deras kväveretentionsförmåga
… in the landscape and they have the ability to reduce nutrients such as nitrogen, and help preventing eutrophication in costal areas. The number of wetlands in Scania have, due to the intensified agriculture been reduced to maximize the area suitable for crops. However since the …
… system with straw removal or returning and a ley system, all with different nitrogen levels. In order to compare the results and to get a wider understanding of the subjects a literature review has been performed. The systems are located in Sweden on four different sites from …
… eutrophication. This is often caused by nutrients such as phosphorus (P) and nitrogen (N) that leak from agricultural areas. A measure to partly prevent the nutrient discharge is to construct or restore wetlands. In order to control the efficiency of nutrient reduction of …
hur påverkar användandet av fungicider utnyttjandet och inlagringen av kväve i höstvete?
A common perception is that fungicide treatments increases yield, but that the nitrogen of the particular grain is diluted so that the overall removal of grain nitrogen from the field remains unchanged. The aim of this paper is to demonstrate that a healthy crop reduces the risk …
Kväve- och fosforrening i anlagda våtmarker.
… The aim of this paper was to determine the efficiency of thesystem in reducing nitrogen, phosphorus, BOD5 and TSS (among other parameters) andgetting a further understanding on different kinds of constructed treatment wetlands as well astheir nitrogen and phosphorus removal …
… a demand on WWTP´s to alter eutrophication in aquatic systems through better nitrogen and phosphorus removal. An increasing number of WWTP´s have acquired biological nitrogen and phos-phorus removal. A by-product of this type of biological treatment is the formation of nitrous …
möjligheter för bebyggelse i Odensala socken
… set by the local authority, i.e. reduction of at least 50 % of the nitrogen and 90 % of both the phosphorus and oxygen demanding compounds. However, the reduction reported in different studies varies greatly between them and also between installations in the same study. A system …
Two ecological models of nitrogen processes in treatment wetlands have been evaluated and compared. These models have been implemented, simulated, and visualized in the Modelica language. The differences and similarities between the Modelica modeling environment used in this …
växthusgaser, energi- och resursanvändning i modellstudie
… This meant increasing restrictions on effluent load of ammonium and total nitrogen, which were reached by adjusting control parameters such as aeration, internal recycle flow, carbon addition etc. Thus the same effluent load of ammonium and total nitrogen were reached for all …
I denna studie har funktionen hos sju anlagda våtmarker för behandling av avloppsvatten i Sverige jämförts över tid med avseende på avskiljning av kväve, fosfor och BOD. Syftet var att undersöka våtmarkernas långsiktiga funktion, skötselåtgärder och relaterade kostnader …
… finns en SHARON-anläggning i drift. SHARON står för ”Stable High rate Ammonia Removal Over Nitrite” och är en kvävereningsprocess för rejektvatten utvecklad av Grontmij i samarbete med Tekniska universitetet i Delft. I denna studie har SHARON-processen i Linköping undersökts …
Populärvetenskaplig sammanfattning: Kvävebelastningen på sjöar och hav har ökat markant de senaste tiotal åren. Jordbruket står för ca 50 % av de svenska kväveutsläppen som människan bidrar till. En ökad kvävebelastning på haven kan leda till övergödning, vilket får en stor …
Underlag för bedömning av normal och hög skyddsnivå i Köpings kommun
… Sea has high priority. There are many different sources of phosphorous and nitrogen and domestic wastewater is one contributing factor to the high load. Especially waste water from households that is not connected to municipal sewage treatment or a local small scale plant with …
