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1.
THE STUDY OF OPTIMAL TECHNOLOGICAL PROCEDURES OF INTERNAL PLUMBING SYSTEM DISINFECTION FACILITIES IN USE BY THE SENSITIVE HUMAN POPULATIONS
Janez Škarja, 2016, master's thesis

Abstract: In a developed world, water is used in a variety of installations and devices for the improvement of life standard. It is important for these elements to be suitably managed and maintained, otherwise they can present a risk to people's health. Although potable water from a public plumbing system coming via the water supply into an internal plumbing system normally is compliant with the regulations, the quality of water in an internal plumbing system often changes – water gets contaminated. There are several types of microorganisms that can grow in water. They carry a great potential for the growth and proliferation of bacteria from the genus Legionella that cause Legionnaires' disease and Pontiac Fever. Even the fact that Legionella infection has for several years been mentioned in the accident insurance conditions of insurance companies in relation to receiving the insurance fee as compensation for bed day, shows the extent and foremost the seriousness of the disease (5–15% mortality rate). The research part of the master thesis focused mainly on determining the presence of bacteria from the genus Legionella in the water of internal plumbing systems of healthcare facilities. During the entire research period of 8 years, 2,676 samples of cold and hot water were acquired from 23 healthcare facilities. The main purpose of the research was to determine the efficiency or adequacy of applied approaches, i.e. physical disinfection with heat and chemical disinfection with chlorine, in eliminating or reducing the amount of Legionella present in the water of selected healthcare facilities. Another aim was to evaluate the impact of softening potable water with polyphosphates on the proliferation of certain microorganisms in water, and to determine the by-products of chemical disinfection. Upon sampling, an organoleptic examination of water (appearance, odour), electrometric measurements of water temperature, and colorimetric measurements of free chlorine concentrations in water were performed. The data for the analysis of Legionella presence were acquired by water sampling and the isolation of bacteria found in the water. In order to acquire laboratory results of specific physical and chemical parameters, ion chromatography, gas chromatography, spectrophotometry, titration, and inductively coupled plasma – mass detector were used. Although water samples from only two healthcare facilities showed no presence of Legionella, the number of water samples with the presence of Legionella decreased for at least 25% from the beginning to the end of period set. Also, after certain general sanitary and technical measures a noticeable improvement within healthcare facilities after 2008 could be observed. Regarding the initial part of the set period, a more favourable relationship between positive and negative samples, a lower number of samples with highest concentrations of present Legionella, and a higher number of samples with lower concentrations of present Legionella were determined. The research has shown that the existing system of ensuring health-compliant water is fairly efficient; however, the results could be improved additionally by investing more into the preparation and renovation of systems. Due to a limited number of samples, a direct impact of adding polyphosphates to potable water could not be linked to the occurrence of Legionella. None of the samples showed an increased concentration of by-products of potable water disinfection. In its conclusion, the research has shown that the procedures after overheating and after chlorine disinfection result in a similar success. While filtration proved to be most efficient, from the perspective of Legionella infections the use of medical bathtubs can present a high risk to people's health, therefore such devices should be subject to more frequent maintenance and supervision.
Found in: ključnih besedah
Summary of found: ...they can present a risk to people's health. Although potable water from a public plumbing...
Keywords: potable water, internal plumbing system, biofilm, health facilities, disinfection, Legionella
Published: 05.09.2016; Views: 4564; Downloads: 248
.pdf Fulltext (1,70 MB)

2.
CityFlux perfluorocarbon tracer experiments
Fredrik K Petersson, Damien Martin, Iain R White, Stephen J Henshaw, Graham Nickless, Ian Longley, Carl J Percival, Martin Gallagher, Dudley E. Shallcross, 2010, original scientific article

Abstract: In June 2006, two perfluorocarbon tracer experiments were conducted in central Manchester UK as part of the CityFlux campaign. The main aim was to investigate vertical dispersion in an urban area during convective conditions, but dispersion mechanisms within the street network were also studied. Paired receptors were used in most cases where one receptor was located at ground level and one at roof level. One receptor was located on the roof of Portland Tower which is an 80m high building in central Manchester. Source receptor distances in the two experiments varied between 120 and 600 m. The results reveal that maximum concentration was sometimes found at roof level rather than at ground level implying the effectiveness of convective forces on dispersion. The degree of vertical dispersion was found to be dependent on source receptor distance as well as on building height in proximity to the release site. Evidence of flow channelling in a street canyon was also found. Both a Gaussian profile and a street network model were applied and the results show that the urban topography may lead to highly effective flow channelling which therefore may be a very important dispersion mechanism should the right meteorological conditions prevail. The experimental results from this campaign have also been compared with a simple urban dispersion model that was developed during the DAPPLE framework and show good agreement with this. The results presented here are some of the first published regarding vertical dispersion. More tracer experiments are needed in order to further characterise vertical concentration profiles and their dependence on, for instance, atmospheric stability. The impact of urban topography on pollutant dispersion is important to focus on in future tracer experiments in order to improve performance of models as well as for our understanding of the relationship between air quality and public health.
Found in: ključnih besedah
Keywords: air quality, atmospheric chemistry, concentration (composition), convective system, dispersion, public health, street canyon, tracer, urban area
Published: 18.07.2019; Views: 1897; Downloads: 0
.pdf Fulltext (1,07 MB)

3.
Airborne Microalgae: Insights, Opportunities, and Challenges
Sylvie V. M. Tesson, Carsten Ambelas Skjøth, Tina Šantl Temkiv, Jakob Löndahl, 2016, review article

Found in: ključnih besedah
Summary of found: ...Airborne microalgae, health effects, ice-nucleation activity, microalgae dispersal...
Keywords: Airborne microalgae, health effects, ice-nucleation activity, microalgae dispersal
Published: 04.01.2021; Views: 1139; Downloads: 0
.pdf Fulltext (448,77 KB)

4.
Analiza utjecaja zagađenja zraka na zdravlje ljudi u Bosni i Hercegovini
Katja Džepina, 2018, unpublished conference contribution

Found in: ključnih besedah
Summary of found: ...Herzegovina, US EPA BenMAP, Cost-Benefit Analysis, Adverse health effects...
Keywords: PM2.5, Ozone, Sarajevo, Tuzla, Zenica, Bosnia and Herzegovina, US EPA BenMAP, Cost-Benefit Analysis, Adverse health effects
Published: 29.05.2021; Views: 966; Downloads: 0
.pdf Fulltext (644,83 KB)
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5.
Rethinking Place
Saša Dobričić, unpublished conference contribution

Abstract: The creation of healthy corridor by using Nature Based Solutions also inspired by the social practice are at the core of the project URBiNAT. They are meant to regenerate deprived urban areas by establishing new halthy and safe connectivity in the urban spece, to transform it into place.
Found in: ključnih besedah
Summary of found: ... Health, corridors, connectivity, space, place, migrations, planning, Nature...
Keywords: Health, corridors, connectivity, space, place, migrations, planning, Nature Based Solutions
Published: 22.06.2021; Views: 908; Downloads: 0
.pdf Fulltext (15,34 MB)

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