Author/Editor     Perc, Andrej; Družina, Branko
Title     Disinfection of drinking water in certain Slovenian water systems
Type     članek
Source     In: Roš M, editor. Proceedings of the 1st international conference on environmental restoration; 1997 Jul 6-9; Ljubljana. Ljubljana: Slovenian water pollution control association,
Publication year     1997
Volume     str. 465-72
Language     eng
Abstract     The purity of drinking water is closely linked to the state of public health, and for this reason attending to the maintenance and protection of quality and chemical/biological purity of this resource is one of the fundamental tasks of the public healthcare system in all countries. The disinfection agents most frequently used by public water systems supplying a large number of people (over 10,000) are as follows: chlorine, chloramine, chlorine dioxide compounds suhc as sodium hypochlorite, sodium dichloroisocyanurate dihydrate, potassium hypochlorite and ozone. In addition smaller systems make use of the following agents or procedures: silver, iodine, potassium permanganate, ultraviolet treatment and heat treatment. Figures collected clearly show that of 959 selected water systems of various capacities in Slovenia only 442 use a disinfection agent. Of the 959 systems examined, 30 supplied more than 10,000 consumers, 123 supplied between 1000 and 10,000 consumers, and 806 supplied less than 1000 people. The 442 that use disinfection agents for drinking water break down as follows: 22 in the first group, 97 in the seconds, and 324 in the third. Detailed examination indicates that 15 systems in the first group use chlorine as a disinfection agent, as do 57 systems in the second group and only 38 in the third. Further analysis indicates that in the third group most systems (190 cases) use sodium dichloroisocyanurate, probably because treatment is simpler and less hazardous than processes such as chlorine treatment. Examples of microbiological analysis are given for the Ljubljana water system and some nearby systems; the method and duration of disinfection is determined on the basis of such analyses. Some typical cases are described and illustrated graphically, and a proposal for uniform use of disinfection agents in Slovenia given.
Descriptors     WATER SUPPLY
WATER POLLUTANTS
WATER PURIFICATION
DISINFECTION
DISINFECTANTS
WATER MICROBIOLOGY