engleski

Trihalomethane formation potential in the surface and underground water near landfill Jakuševec

One of the biggest problem in the treatment of water for publich supply is formation of chlorinated by-products, some of which are potentially carcinogenic with long term health effects. Trihalomethanes are the major componente of total disinfectant by-products in chlorinated water. The aim of the study was to examine influence of unsanitary landfill on surface and underground waters. The analysis was performed ont he samples taken directly from borehole in landfill Jakuševec (JM.19), outside the landfill area (JM-23), and from Sava river near the landfill. The dissolved organic matter was fractionated by molecular weight (MW) by ultrafiltration. Trihalometnale formation potential was mesured on prepared fraction and row water by chlorinating with sodium hypochlorite. The results showed that most organic matter (28 mg/L), expressed as nonpurgeable organic carbon (NPOC), was found in the sample (JM-23) contained 2 mg NPOC/L. There was a difference in participation of single organic matter fractions in the samples from Sava pointing to the autochthonous origin of dissolved organic matter. The highest fraction quantities MW<10000 were found in the sample JM-19 (34%), MW 10000-50000 in the JM-23 (52%) and MW >50000 (33%) in the Sava river sample. After the chlorinating the cominant trihalomethane was chloroform > 90% followed by bromochloromethane and dibromochloromethane, while bromoform was detected only at lower pH values. 60% of total tihalomethane developed within 24 hours. The sample with highest fraction potential was JM-19 (62-76 *=mikrog THM/mg NPOC), then Sava river (30-44 *=mikrog THM/mg NPOC) and least had JM-23 sample (33-39 *=mikrog THM/mg NPOC). Future water intakes for the production of drinking water for the city of Zagreb are downstream from the landfill Jakuševec. These results that sanitation of landfill is necessary in order to prevent pollution of adjacent aquifers under them.

trihalomethane; surface water; underground water

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