Thesis (M. Sc.)--University of Hong Kong, 1999. / Includes bibliographical references (leaves 65-68).

This diploma thesis deals with the drinking water quality in the Prachatice Hospital. In every healthcare facility, it is essential to maintain and monitor the quality of drinking water. The diploma thesis has the following objectives: Evaluation of the quality and quantity of drinking water and hot water at the Prachatice Hospital in certain time periods, comparison between another hospital in the South Bohemian region with the occurrence of Legionell in the given period, the possibility of solving crisis situations in accidents in the healthcare facility and possibilities of rainwater use in the Prachatice Hospital. The thesis is divided into theoretical and practical parts. The theoretical part of the thesis describes basic concepts related to the quality of drinking water, indicators of drinking water and a section is devoted to a water accident in the Prachatice Hospital in the autumn of 2015. The practical part was processed by the method of secondary analysis of data. The necessary data for the analysis was obtained directly at the Prachatice Hospital and at the Regional Hygiene Office in České Budějovice. For the analysis, data from January 2011 to January 2017 was used and processed in Microsoft Excel into tables and charts. The results show the overall drinking water supply situation in the Prachatice Hospital. The work could draw attention to the problems and issues associated with emergency situations, for example. Hospital management and professionals in drinking water technology department can get a comprehensive overview of the hospital's drinking water supply from its own well, public well and the public water supply.

Das Auftreten von Braunwasser in Trinkwasserverteilungsnetzen ist eine Beeinträchtigung der Trinkwasserqualität, die durch mobilisierte partikuläre Ablagerungen verursacht wird. Die Partikel gelangen durch verschiedene Prozesse, wie z. B. der Korrosion metallischer Leitungen und den Eintrag am Wasserwerk, kontinuierlich in sehr geringen Massenströmen in das Rohrnetz. Durch die Akkumulation der Partikel an Rohroberflächen können sich Ablagerungsmengen bilden, die bei ansteigenden Strömungsgeschwindigkeiten resuspendiert werden und zu unerwünschten Braunwassererscheinungen führen. Die vorliegende Arbeit behandelt die experimentelle Untersuchung des Transportes von Partikeln, die für Trinkwassernetze typisch sind, in Rohrströmungen. Es werden Einflussfaktoren identifiziert, die für den Partikeltransport von Bedeutung sind. Ein neu entwickeltes dynamisches Modell beschreibt den Transport von Partikeln und die Ablagerungsbildung in Rohrströmungen und vermaschten Rohrnetzen. Das Modell wurde in einer Anwendersoftware implementiert und an einem Trinkwasserverteilungsnetz für das Nachvollziehen der beobachteten Ablagerungsbildung eingesetzt. Im Vergleich zu bestehenden dynamischen Modellen werden partikelbezogene Prozesse unter Berücksichtigung der für trinkwasserbürtige Partikel und Ablagerungen typischen Eigenschaften mathematisch genauer beschrieben. Stationäre und dynamische Ereignisse bezüglich Wasserqualität und Ablagerungsbildung können jetzt durch die Berücksichtung zahlreicher zeitabhängiger Einflussfaktoren nachvollzogen werden. / The occurrence of discoloured water in drinking water distribution systems is a disturbance of the water quality, which is induced by mobilised particulate deposits. Different processes result in the continuous entry of small mass flow rates of particles into the piping, for instance the corrosion of metallic pipes as well as the entry at the water works outlet. By the accumulation of these particles, significant amounts of deposits can be formed and at higher flow rates be resuspended, which leads to unwanted events with discoloured water. This study examines the experimental investigation of the transport of particles, which are typical for drinking water distribution systems, in pipe flow. Influencing factors are identified, which are of importance for the particle transport. With a newly developed model, the transport of particles and the deposit formation in pipe flow and in piping is described. The model is implemented into a software application and deployed at a drinking water distribution system to understand the observed deposit formation. In comparison with existent dynamic water quality models, particle-related processes are described mathematically in more details, under consideration of characteristics typical for particles and deposits in drinking water distribution systems. Hence, observed steady-state and dynamic events can be followed using several influencing time-dependent factors.