The authors conclude that in-situ fluorometers should be capable of sensitively monitoring water quality changes in distribution systems between source and consumers, although issues related to reliability, sensitivity and calibration present technical hurdles worthy of further development and investigation.Trace metals can interfere with spectroscopic measurements in the distribution system and increase detection thresholds for observing significant changes in organic matter quality. It is therefore important to consider trace metals when investigating DOM fluorescence as a potential tracer of contamination in unfamiliar networks.
The Inspectorate has developed, and introduced this year, a new measure called the Compliance Risk Index, (CRI). This measures risk calculating a value which takes into account the consequence of failures using the prescribed values in the Regulations, any potential health risks, the population affected and the assessed actions of the company in response. The Inspectorate is developing an Event Risk Index, building upon the principles of the CRI.
Danish students have developed a special bag known as SolarSack that is filled with four liters of water and placed in the sun for four hours. Using UVA and UVB rays, as well as heat from the sun, the water is cleansed of pathogenic bacteria. The user can then drink the water and reuse the bag for water purification.
The method was approved by the World Health Organization which estimates that between 99.9 and 99.999 percent of the pathogenic bacteria in the water die.
This may have implications for changes in source of supply to a network