AWAM International Conference on Civil Engineering 2019 (AICCE'19) - Nibong Tebal - Malaysia (2019-08-21)

Disinfection By-products Precursors Removal by Simultaneous Coagulation and Disinfection in River Water
Disinfection in drinking water had significantly reduces the risk of pathogenic dis-eases but may cause chemical threat to human health due to disinfection by-products (DBPs) formation in the presence of natural organic matter (NOM). NOM had caused many problems in drinking water, which can be removed by several treatment options such as coagulation. The main objective of this research is to study the ability of DBPs precursors removal when combining coagulation and dis-infection. The first part of this study involved the comparison between effectiveness of two ferric-based coagulants for coagulation process while the second part in-volved the efficiency of DBPs precursors removal by using simultaneous coagula-tion and disinfection. Selected water quality parameters such as turbidity, UV254, colour and DOC were tested to observe the DBPs precursors removal. The coagu-lants used in this study were ferric chloride (FeCl3) and ferric sulphate (Fe2(SO4)3) while chlorine (Cl2) and chlorine dioxide (ClO2) were used as disinfectants. FeCl3 was proven to be a better coagulant compared to Fe2(SO4)3 in removing DBPs precursors, when used alone. The combination between FeCl3 and Cl2 resulted in the highest turbidity and UV254 removal while the combination between Fe2(SO4)3 and Cl2 had the highest DOC removal from the water sample.
Dr. Nurul Hana Mokhtar Kamal, Mrs. Nur Izzati Naserun