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The purpose of this study was to assess biodegradability of the dissolved organic matter (DOM) fractions of different composition and origin and to understand how these DOM fractions are removed during the full scale drinking water treatment process (DWTP). This study provides an important insight into biodegradations of DOM fractions by LC-OCD-OND analysis methods. Biopolymers (BP) were biodegradable most easily and quickly compared to other fractions, followed by low molecular weight-neutrals (LMW-neu), and building blocks (BB) and humic substrances (HS) showed a very similar biodegradation rate. Biodegradation or production of BDOC and BDON were observed in the HS fraction. Most of the BDOC and BDON were removed by coagulation/sedimentation process in DWTP. These results highlight the importance of an optimised coagulation process to remove as much biodegradable high molecular weight (MW) dissolved organic matter (DOM) as possible. BDOC incubation test results showed microbial catabolism of all DOM fractions regardless of the MW of DOM fractions. Therefore, to minimize the risk of microbial growth and proliferation in the drinking water distribution systems, it is pointed out the need to control all possible DOM fractions in the DWTP.

Insight into Biodegradation of Dissolved Organic Matter Fractions using LC-OCD-OND in Drinking Water Treatment Processes