Chlorination disinfection by-products in municipal drinking water – A review

For long time water disinfection is being done to inactivate or control bacteria populations in the treated water and simple chlorination is the most common method to disinfect the water. Almost certainly for over a decade chlorination is being effectively utilized for controlling of water borne contamination. An assortment of disinfection by-products (DBPs) are formed like trihalomethanes (THMs), haloacetic acids (HAAs) and halogenated acetonitriles (HANs) etc., when the naturally occurring natural organic matters (NOMs) present in raw water reacts with chlorine that may have adverse health impacts on humans. These compounds fall apart the water quality and there are epidemiological confirmations of close connection between its emergence and unfavourable results especially the malignant growths of fundamental organs in individuals. Concerns related with the prospective health hazards of DBPs provoked a few industrialized nations to build up various guidelines. Due to lack of data more research is required to understand its adverse health effects on human beings which are being restrained by funds required for researches. DPBs dermal and inhalation exposure routes have greater risk as compared to ingestion route. The DBPs can be controlled by methods like coagulation with polymer, alum, lime or iron, sulphates, adsorption on activated carbons, ion exchange or membrane process and to more effectively reduce the precursor i.e. NOMs.