| Abstract: | In order to comply with the European Community Directive on the quality of water intended for human consumption', which was embodied in the 1989 Water Act, a number of problems need to be addressed. One such problem is to identify a reliable method of secondary disinfection for service reservoirs which have a history of bacteriological failures.
This paper considers the advantages and disadvantages of ultraviolet (UV) and chemical disinfection techniques (both hypochlorite dosing and on-site generation of chlorine), together with the basic design features, and presents a case study examining capital and revenue costs. The collated information suggests that UV disinfection is a cost-effective secondary-disinfection technique. This suggestion is supported not only by the cost benefits but also by the ease of operation, improved monitoring and control, and elimination of water quality problems associated with chemical techniques. |
