Sökning: "constructed wetlands"

Visar resultat 21 - 25 av 34 avhandlingar innehållade orden constructed wetlands.

1. 21. Greenhouse gas production in nitrogen removal wetlands

   Författare :Johanna Stadmark; Biologiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : Nitrogen removal wetlands are constructed in agricultural areas as a measure to reduce the amount of non-point source nitrogen that reaches coastal areas. Methane and nitrous oxide, two greenhouse gases, are produced under anaerobic conditions and an increased amount of waterlogged areas will therefore increase the potential emission of these gases. LÄS MER

3. 22. Analysis of phosphorus retention variations in constructed wetlands receiving variable loads from arable land

   Författare :Karin Johannesson; Karin Tonderski; Charlotte Kjaergaard; Stefan Weisner; Linköpings universitet; []
   Nyckelord :NATURAL SCIENCES; NATURVETENSKAP;

   Sammanfattning : Seven wetlands, constructed on agricultural land in the south of Sweden, were investigated with respect to phosphorus (P) retention. The overall aim was to increase the understanding of P retention and find possible explanations for the variations in retention that have been observed in previous studies. LÄS MER

4. 23. Monitoring anti-infectives and antibiotic resistance genes : with focus on analytical method development, effects of antibiotics and national perspectives

   Författare :Ghazanfar Ali Khan; Jerker Fick; Klaus Kümmerer; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; method development; on-line solid phase extraction liquid chromatography mass spectrometry SPE LC-MS MS ; antibiotics; anti-infectives; constructed wetlands CWs ; denatured gradient gel electrophoresis DGGE ; percentage removal efficiency PRE ; shannon index; antibiotic resistance genes ARGs ; real-time polymerase chain reaction RT-PCR ; drug formulation facilities DFF ; wastewater; epidemiology; pandemic; influenza; compliance;

   Sammanfattning : Antibiotics are biologically active and are globally used in humans and animal medicine for treatment and in sub-therapeutic amounts as growth promoters in animal husbandry, aquaculture and agriculture. After excretion, inappropriate disposal and discharge from drug production facilities they enter into water bodies either as intact drugs, metabolites or transformed products. LÄS MER

5. 24. Structure and function of microbial communities in constructed wetlands - influence of environmental parameters and pesticides on denitrifying bacteria

   Författare :Susann Milenkovski; Biologiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; fungicide; concentration-response curves; nosZ; nirS; nirK; bacterial activity; denitrification; bacterial community composition; herbicide; insecticide;

   Sammanfattning : This thesis addresses the interactions and relationships between natural aquatic bacterial communities, environmental parameters, anthropogenic chemicals and the denitrification pathway in the habitat of agricultural constructed wetlands. The main aim was to gain fundamental knowledge of the drivers behind the processes of the denitrification (i.e. LÄS MER

7. 25. Wetlands as a means to reduce the environmental impact of mine drainage waters

   Författare :Åsa Sjöblom; Bert Allard; Karsten Håkansson; Linköpings universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Lakvatten; våtmarker; vattenrening; miljö; Water in nature and society; Vatten i natur och samhälle;

   Sammanfattning : In many mining regions of the world, pollution of surface water and groundwater by drainage water originating from mines aiming waste poses either a serious threat to the environment, or a severe environmental problem. During the last two and a half decades, treatment of mine drainage water in constructed and natural wetlands has emerged as an alternative to more conventional methods to handle the problem. LÄS MER