Domestic and Industrial



CHLORINE DOSING

     Chlorinated disinfectants introduced into the water to destroy pathogenic microbes and form a residual chlorine component such that drinking water may reach the consumer tap safe from microbial contamination, may react with naturally present fulvic and humic acids to produce a range of DBPs including trihalomethanes, haloacetic acids and many others. Residual chlorine may also react further within the distribution network if it comes into contact with organic material accumulated there e.g. as biofilms. In addition to being highly influenced by the types of organic and inorganic matter in the source water, the different species and concentrations of DBPs vary according to e.g. chlorine dosing at the drinking water disinfection stage, the time since dosing, temperature, pH of the water [3]. The proposed interim standard for total trihalomethanes in drinking water is 0.1PPM.