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Use of a stable carbon isotope to assess the efficiency of a drinking water treatment method with CO[sub]2
Mojca Poberžnik, Albrecht Leis, Aleksandra Lobnik, 2012, izvirni znanstveni članek

Opis: CO2 gas with a special isotopic signature (?13C = -35.2% vs. VPDB) was used as a marker to evaluate the efficiency of a drinking water treatment method and the effect of an ultrasonic (US) stirrer. This treatment was developed to prevent precipitation and corrosion effects in water-supply systems. The research work was performed using a laboratory-scale pilot plant that was filled with tap water. The stable isotope analyses of ?13C-DIC (Dissolved Inorganic Carbon) in the water samples indicated that the maximum content of added CO2 gas in DIC was in the range of 35 to 45%. The use of the US stirrer during the entire experiment decreased the method's overall efficiency by 10%, due to degassing at a late stage of the experiment but accelerated the dissolution process in the early experimental stage.
Ključne besede: 13C stable isotope, carbon dioxide, carbonate equilibrium, corrosion, drinking water, limestone
Objavljeno: 01.06.2012; Ogledov: 1616; Prenosov: 22
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Solute transport monitoring in the Ljubljana urban aquifer
Branka Trček, Andrej Juren, Albrecht Leis, 2012, objavljeni znanstveni prispevek na konferenci

Opis: Groundwater from a Pleistocene sandy-gravel aquifer is an invaluable drinking water resource for the Ljubljana city (Slovenia), as well as for the Union brewery, which is located within an industrialized area near the centre of Ljubljana. A big part of the aquifer recharge area is highly urbanized, which represents a great risk for the groundwater quality assurance. The extensive monitoring of solute transport was performed in the brewery catchment area with the intention to analyze the contamination risk of drinking-water resources. It based on continuous measurements of hydrodynamic parameters and of physico-chemical water parameters (T, SEC) and on groundwater sampling for herbicide, isotope, trace elements and trace gas analyses. results indicated possible contaminant inflow into the Union brewery area. The results pointed out the risk of pollution breakthrough into the lower gravel aquifer and served for the development of a local hydraulic model.
Ključne besede: podzemni vodni viri, podzemne vode, hidrogeološke raziskave, pitna voda, pivovarne, monitoring
Objavljeno: 10.07.2015; Ogledov: 547; Prenosov: 23
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Risk assesment of an urban aquifer based on environmental tracers
Branka Trček, Primož Auersperger, Albrecht Leis, Jürgen Sültenfuss, 2013, izvirni znanstveni članek

Opis: Groundwater from a Pleistocene sandy-gravel aquifer is a drinking water resource for the Union brewery, located near the centre of Ljubljana (Slovenia). A large part of the aquifer recharge area is highly urbanized, which represents a great risk for the groundwater quality assurance. The groundwater dating techniques were used to study the contamination risk of this drinking-water resource. The application of chlorofluorocarbons (CFCs), sulphur hexafluoride (SF6) and tritium-helium-3 (3H-3He) age indicator was tested, as they haven’t been used in Slovene urban areas so far. The results reflect that the 3H-3He dating technique is the most suitable for a groundwater age determination in the study urban aquifer, since SF6 and particularly CFCs concentrations could be affected by the local contaminations. They indicated that average groundwater residence times range from 10 to 30 years. Boreholes that are more distant from the Šišenski hrib hill are more vulnerable to contamination due to flow of young groundwater from a direction of the main aquifer, which is exposed to the urban pollution. The presented results were supplemented with chemical investigations of groundwater organic pollutants. An unknown trace organic pollutant with a base ion mass-to-charge ratio 147 was put into focus. Its identification based on chromatographic separation and a mass spectrometric detection with GC-MS, LC-MS and LC-TOF MS techniques. The newly detected trace organic pollutant in sampled groundwater represents together with the 3H and 3He data a new technique to study the flow paths and contaminant transport in the urban aquifer in both, the lateral and vertical directions.
Ključne besede: urban area, intergranular aquifer, contamination risk, environmental tracers
Objavljeno: 24.07.2017; Ogledov: 452; Prenosov: 252
.pdf Celotno besedilo (502,53 KB)
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Risk assessment of mineral groundwater near Rogaška Slatina
Branka Trček, Albrecht Leis, 2017, objavljeni znanstveni prispevek na konferenci

Ključne besede: groundwater, thermo-mineral waters, environmental protection
Objavljeno: 02.02.2018; Ogledov: 433; Prenosov: 199
.pdf Celotno besedilo (701,38 KB)
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Improvements to the quality of underground water by introducing carbon dioxide
Mojca Poberžnik, Ludvik Trauner, Albrecht Leis, Aleksandra Lobnik, 2008, izvirni znanstveni članek

Opis: The presented research work is focused on the development of an innovative way of economically improving the quality of underground water by the application of carbon dioxide. The basic pilot plant was developed with the idea of applying carbon dioxide in order to maintain the carbonate equilibria in water, pumped from under the ground. The optimal content of this natural component in underground water, used in urban areas for different purposes (e.g. drinking water, heating systems etc), simultaneously prevents corrosion and precipitated mineral deposits. The adaptation of an existing pilot plant started with operational testing and preliminary measurements. An appropriate sensor system for the online monitoring of the tap waterćs heating process measuring parameters such as the temperature, the concentration of dissolved carbon dioxide, the conductivity and the pH value was built in. Different amounts of carbon dioxide were applied during the two experimental stages. The composition of the water was regularly analysed using automatic titration and ionic chromatography. The gas-dosing control in the first phase was volumetric. Due to an observed inaccuracy in the gasdosing system, the volumetric dosing control was replaced with a system for the mass control of the introduced gas. Closing the system was considered to be suitable, as the water composition remained almost constant during the entire experiment. Improvements to the gas-dosing control and the closing of the system were carried out in the final phase of the pilot plant's adaptation. Further measurements were made in different seasons to test the seasonal influences on underground water's composition and the efficiency of the carbon dioxide supply.
Ključne besede: underground water, drinking water quality, pilot plant, carbonate equilibria, carbon dioxide, precipitation, scale
Objavljeno: 05.06.2018; Ogledov: 381; Prenosov: 31
.pdf Celotno besedilo (661,89 KB)
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