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Carbonaceous and nitrogenous halogenated disinfection by-products formation potential in drinking water

Włodyka-Bergier A., Bergier T., Kot M.

Logistyka

2015

nr 4

9914--9921, CD3

The goal of this research is to assess the potential of organic matter to form water disinfection by-products. The experiments were been conducted on the water samples (after the treatment process, but prior disinfection) taken from Water Treatment Plants Raba and Bielany. Both analyzed Plants apply chlorination, as the water disinfection process. The water samples were chlorinated using sodium hypochlorite, with a dosage that resulted in a residual free chlorine on a level 3–5 mg dm-3 after 24 h. After this time, a gas chromatography was employed to analyze water chlorination by-products from trihalomethanes group, haloacetic acids, haloacetonitriles, haloketones, chloral hydrate and chloropicrin. The experiments showed that water samples taken from Water Treatment Plants Raba and Bielany characterized with different potential to form analyzed water chlorination by-products. When compared to water from Bielany, water from Water Treatment Plant Raba had the higher potential to form haloacetic acids, haloketones and chloral hydrate, even though it was better quality. Only the formation potential for trihalomethanes was higher in the sample from Bielany. The formation potential of water from Raba was higher also for nitrogenous chlorination by-products (haloacetonitriles and chloropicrin) in comparison to water taken from the Plant Bielany – this potential, in one unit of organic nitrogen, for water from Raba was three times higher for haloacetonitriles, and more than 8 times higher for chloropicrin. Due to the higher concentration of bromine ions in water from Bielany, bromide water disinfection by-products were formed in higher concentrations than in water from Raba. The highest influence of the bromine ions was observed for haloacetonitriles.