Study On Formation Characteristics Of Iodinated Disinfection By-products

Drinking water quality is closely related to human health.In the treatment process,disinfection can kill pathogens and microorganisms effectively, but it also react with naturalorganic matter in the water to produce a variety of disinfection by-products,which have raisedgreat potentially harmful to environment and human health. Currently, there are hundreds ofdisinfection byproducts species have been found.More and more of disinfection byproductsare detected with the improvement of in-depth research and testing technology. Iodinateddisinfection byproducts is an emerging DBPs, it has a stronger cytotoxic and geneticcharacteristics compared with chloroform, haloacetic acids and other conventionaldisinfection byproducts. Therefore it is a new research field of drinking water.This research developed the method for detection and analysis of iodinatedtrihalomethanes, studied the influential factors of iodinated trihalomethanes in chlorinedisinfection process, such as the reaction time,amount of chlorine, different disinfectantdosing sequence and Br-:I-impact.Investigated the formation levels of iodinatedtrihalomethanes and trihalomethanes in different source water，comprehended the relationshipbetween iodinated disinfection byproducts with conventional disinfection byproducts.The research on formation influential factors of iodinated trihalomethanes showed thechlorine can oxidite I-into HOI rapidly to produce more iodinated trihalomethanes in60min;the variation chlorine dosage had greater effect on iodinated trihalomethanes,whilethe less effect on the distribution of components, CHCl2I is most likely to be detected in thesix iodinated trihalomethanes; The experiments demonstrated the higher I-concentration, themore kinds of iodinated disinfection byproducts; total formation of iodinated trihalomethanesdecreased significantly with Br-: I-ratio increased;when Cl2/N is3, the iodinatedtrihalomethanes concentration was suppressed to the maximum extent.The survey about formation levels of THMs and I-THMs in10water sources showed thatI-THMs formation potential concentration range for the3.29-18.93ug/L, while the totalTHMs formation potential concentration range for9.1-105.4μg/L; Chloroform is largestproportion in the THMs, which was accounted for almost70%; The correlation betweenI-THMs on behalf of the the THMs is more than0.8; the higher COD concentration in rawwater, the more formation potential capacity of iodinated trihalomethanes.