Electronic Thesis and Dissertation Repository

Degree

Master of Engineering Science

Program

Chemical and Biochemical Engineering

Supervisor

Dr. Madhumita Ray

Abstract

Algal organic matters (AOM) are cellular materials releasing from algae species which can serve as precursors to form disinfection by-products (DBPs) after chlorination. AOM can be removed during drinking water treatment by coagulation. In this study, dissolved organic carbon (DOC) and UV254 absorbance were used to assess the time dependent release of algal matters for four algal species during coagulation using alum. A GC-ECD was employed to analyze the formation of DBPs at different background water qualities. Results showed that alum dose of 30 mg/L did not cause any damage to the algae cells, and they continued to release organic matters in treated water with time. Uniform formation condition (UFC) was used to determine the DBP formation potential, specifically haloacetic acids (HAA) from algal matter. DBP formation increased with increasing settling time. Empirical DBP formation models developed in this study showed good correlations between HAA formation and relevant water quality parameters.

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