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Statistical investigation of trends and spatial distribution of Danish drinking water quality

Danish water supplies are entirely based on groundwater and in Denmark the only treatments applied before the distribution are aeration, filtration and pH adjustment. For that reason, to keep the water source under control is particularly important. Groundwater is often considered a stable and consistent resource for drinking water supply but different treatment practices at the water works influence the final product. Nevertheless, no research were led about the long-term changing of drinking water after treatment at the water works. This study focuses on the changes over time and the average levels of the main inorganic water compounds with a particular attention on their effects on taste, corrosion and dental health.

Mostra/Nascondi contenuto.
Chapter 3 The data 3.1 GEUS and Jupiter database The analysis is based on data from Jupiter, the national borehole database, maintained by GEUS (Geological Survey of Denmark and Greenland). The database contains data on wells, geology, water level and groundwater chemistry, as well as data about water supply, water abstraction licenses, yearly abstraction, and the exchange of drinking water between waterworks installations in addition to the chemistry of drinking water. Data are provided by the drilling companies and waterworks. Data are collected following a timetable depending on the annual discharge of treated or distributed water in accor- dance with Danish legislation (see Table 3.1). In the normal controls, the compounds analyzed are NVOC, ammonium, iron, manganese, chloride, uoride, nitrate, nitrite, sulfate, temperature and pH; in the extended controls TDS, calcium, magnesium and hydrogen carbonate are also analyzed. The choice analyze the data from the euent of the treatment plants was taken owing to the following reasons: To investigate the actual drinking water quality that one Danish citizen takes. In fact, one water work can be supplied by more wells, also located far away from the water distribution system. Thus, sometimes it can be dicult to establish where a certain user’s water is taken. However, every user can determine which water works the water is treated by just looking at the bill. The water quality should be steady over time after treatment, but no investigations have been led so far to check it. Sometimes the water quality is not so stable as it is supposed to be owing to several causes (such as the change of wells from which the water is taken, changes in water treatment operation, the introduction of new law requirements, etc.). 15

Tesi di Laurea Magistrale

Facoltà: Ingegneria

Autore: Irene Cavasin Contatta »

Composta da 149 pagine.

 

Questa tesi ha raggiunto 115 click dal 16/05/2014.

Disponibile in PDF, la consultazione è esclusivamente in formato digitale.