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Halomethanes and organic pollutants in drinking water after disinfection

Bake M., Pastare S., Zilbere U., Pastare I.

Archiwum Ochrony Środowiska

2002

Vol. 28, no. 4

9-13

Water supply of Riga City uses water from the river Daugava, lakes Baltezers as well as deep well groundwater as drinking water. Due to chlorination of drinking water before use, inhabitants health may be at risk due to trihalomethanes and some organic pollutants. The objective of this study was to determine the level of pollution of drinking water and possible health risk. Pollutants were determined with previous solid phase microextraction (on fibre coated with polidimethylsiloxane) or pentane extraction of chemical substances by use of gas chromatography and for benzo(a)pyrene by speetrofluorimetry The summary concentration of thrihalomethanes (bromoform, chloroform, bromodichloromethane, dibromochloromethane) ranged from 3.4ug/dm3 to 304.4ug/dm3 (maximum allowable concentration - MAC 100ug/dm3 according to water standards in Latvia), summary trichloroethene and tetrachloroethene occurred in the concentration from 1.0ug/dm3 to 13.4 ug/dm3 (MAC = 10ug/dm3) The level of aromatic hydrocarbons benzene and toluene was below 0.2 ug/dm3 (MAC = 1ug/dm3). The concentration of benzo(a)pyrene was below 0.002ug/dm3 (MAC = 0.01ug/dm3). Fluctuations of concentration were found to depend on the season and place of sampling. The results confirmed an occurrence of risk due to the impact of trihalomethanes to health. Therefore, water ozonation has been planed to replace chlorination with ozonation in Riga City.