Electronic Thesis and Dissertation Repository


Master of Engineering Science


Chemical and Biochemical Engineering


Dr. Madhumita Ray


Algal organic matter (AOM) is found in high concentration during algal bloom season in drinking water systems, which is generally categorized into extracellular organic matter (EOM) and intracellular organic matter (IOM). These compounds are not well removed in traditional water treatment methods such as coagulation, and are the precursors of subsequent disinfection by-products (DBPs) during chlorination of water. In this study, EOM and IOM content of four different algae were quantified measuring dissolved organic carbon (DOC), UV absorbance at 254 nm and turbidity. Coagulation using alum (Al2(SO4)3•16H2O)was used to remove the algal matters. UV radiation and post-UV chlorination were used to determine the DBPs formation potential of the algal matters. The DBPs such as trihalomethanes (THMs) and Haloacetic acids (HAAs) were analyzed after disinfection treatment. The DBPs formation decreased in coagulated algae. Compared with EOM, IOM produced more DBPs because of higher content of protein and aromatic organic matters.